:root {
  --white: #ffffff;
  --ice: #f4fbff;
  --light-blue: #dceffd;
  --blue: #2878c7;
  --navy: #173456;
  --green: #3da66b;
  --orange: #f29a3f;
  --red: #e84848;
  --text: #29405a;
  --muted: #6b8197;
  --shadow: 0 18px 45px rgba(35, 81, 118, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.9;
  background:
    radial-gradient(circle at 12% 8%, rgba(242, 154, 63, 0.16), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(61, 166, 107, 0.14), transparent 28%),
    linear-gradient(180deg, #f6fbff 0%, #ffffff 34%, #f7fbf8 100%);
}

body.home-page {
  background:
    radial-gradient(circle at 9% 10%, rgba(242, 154, 63, 0.2), transparent 25%),
    radial-gradient(circle at 88% 12%, rgba(61, 166, 107, 0.18), transparent 27%),
    radial-gradient(circle at 18% 74%, rgba(40, 120, 199, 0.14), transparent 30%),
    linear-gradient(160deg, #f7fbff 0%, #fffaf3 38%, #f1fbf6 72%, #ffffff 100%);
}

body.home-page--calm {
  --blue: #4f7fd8;
  --green: #62b89a;
  --orange: #d99b72;
  --navy: #263959;
  --text: #34445f;
  --muted: #72829d;
  background:
    radial-gradient(circle at 12% 8%, rgba(177, 201, 255, 0.42), transparent 28%),
    radial-gradient(circle at 86% 16%, rgba(209, 191, 255, 0.36), transparent 30%),
    radial-gradient(circle at 18% 82%, rgba(175, 226, 207, 0.36), transparent 32%),
    linear-gradient(155deg, #f8fbff 0%, #f4f1ff 40%, #eefaf7 78%, #ffffff 100%);
}

body.home-page--warm {
  --blue: #3f84ad;
  --green: #6ea86d;
  --orange: #dd8954;
  --navy: #3d4454;
  --text: #4d4a42;
  --muted: #7a756c;
  background:
    radial-gradient(circle at 10% 8%, rgba(255, 187, 134, 0.36), transparent 27%),
    radial-gradient(circle at 88% 18%, rgba(150, 199, 152, 0.32), transparent 29%),
    radial-gradient(circle at 22% 82%, rgba(117, 176, 214, 0.18), transparent 32%),
    linear-gradient(155deg, #fff8f1 0%, #fff3e7 36%, #f2faf0 72%, #ffffff 100%);
}

button {
  font: inherit;
}

a {
  color: inherit;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px max(18px, calc((100vw - 1120px) / 2));
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid #d7ebf9;
  backdrop-filter: blur(10px);
}

.site-nav__brand {
  color: var(--navy);
  font-weight: 900;
  text-decoration: none;
}

.site-nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.site-nav__links a {
  padding: 7px 12px;
  color: var(--blue);
  font-size: 0.92rem;
  font-weight: 800;
  text-decoration: none;
  background: #f4fbff;
  border: 1px solid #cfe6f7;
  border-radius: 999px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 56px 22px 64px;
  background: linear-gradient(135deg, #ffffff 0%, #eaf6ff 58%, #f2fff7 100%);
}

.home-page--calm .hero {
  background:
    radial-gradient(circle at 24% 18%, rgba(255, 255, 255, 0.86), transparent 34%),
    linear-gradient(135deg, #f9fcff 0%, #edf2ff 54%, #effbf7 100%);
}

.home-page--warm .hero {
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 255, 255, 0.88), transparent 34%),
    linear-gradient(135deg, #fffaf5 0%, #fff0df 52%, #eef9ef 100%);
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 42px;
  align-items: center;
  max-width: 1060px;
  margin: 0 auto;
}

.hero__inner--image {
  display: block;
  max-width: 1120px;
}

.hero__main-image {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(189, 224, 246, 0.95);
  border-radius: 24px;
  box-shadow: 0 24px 58px rgba(35, 81, 118, 0.18);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  padding: 6px 16px;
  color: var(--green);
  font-weight: 700;
  background: #e9f8ee;
  border: 1px solid #c8ead5;
  border-radius: 999px;
}

.hero h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(2.2rem, 6vw, 4.4rem);
  line-height: 1.18;
  letter-spacing: 0;
}

.hero h1 span {
  color: var(--blue);
}

.hero__lead {
  margin: 22px 0 0;
  color: var(--orange);
  font-size: 1.22rem;
  font-weight: 800;
}

.hero__badge {
  display: grid;
  place-items: center;
  width: 142px;
  height: 142px;
  margin-top: 28px;
  color: var(--navy);
  font-weight: 800;
  text-align: center;
  line-height: 1.55;
  background: #fff4df;
  border: 5px solid #ffd38c;
  border-radius: 50%;
  box-shadow: 0 16px 30px rgba(242, 154, 63, 0.22);
  transform: rotate(-5deg);
}

.hero__decor {
  position: absolute;
  border-radius: 50%;
  opacity: 0.45;
}

.hero__decor--one {
  width: 260px;
  height: 260px;
  left: -90px;
  top: -90px;
  background: #bce4ff;
}

.hero__decor--two {
  width: 190px;
  height: 190px;
  right: -70px;
  bottom: -60px;
  background: #c9efd7;
}

.hero__network {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__network::before,
.hero__network::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(40, 120, 199, 0.32), transparent);
  transform: rotate(22deg);
}

.hero__network::before {
  top: 120px;
  right: 30%;
}

.hero__network::after {
  bottom: 90px;
  left: 18%;
}

.hero__network span {
  position: absolute;
  width: 10px;
  height: 10px;
  background: var(--blue);
  border: 3px solid var(--white);
  border-radius: 50%;
  box-shadow: var(--shadow);
}

.hero__network span:nth-child(1) { top: 110px; left: 12%; }
.hero__network span:nth-child(2) { top: 180px; right: 26%; }
.hero__network span:nth-child(3) { bottom: 130px; left: 28%; }
.hero__network span:nth-child(4) { bottom: 190px; right: 12%; }

.learning-illustration {
  position: relative;
  min-height: 390px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(189, 224, 246, 0.9);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.speech-bubble {
  position: absolute;
  top: 34px;
  left: 30px;
  padding: 14px 18px;
  color: var(--navy);
  font-weight: 800;
  line-height: 1.45;
  background: #ffffff;
  border: 2px solid #bde3fb;
  border-radius: 18px;
}

.speech-bubble::after {
  content: "";
  position: absolute;
  right: 20px;
  bottom: -13px;
  border-width: 13px 9px 0;
  border-style: solid;
  border-color: #bde3fb transparent transparent;
}

.checklist {
  position: absolute;
  top: 38px;
  right: 24px;
  width: 112px;
  padding: 16px;
  background: #f8fcff;
  border: 1px solid #cfe6f7;
  border-radius: 16px;
}

.checklist div {
  height: 10px;
  margin: 8px 0;
  background: linear-gradient(90deg, var(--green) 0 18px, #c8deee 18px);
  border-radius: 999px;
}

.person {
  position: absolute;
  left: 142px;
  bottom: 118px;
  width: 148px;
  height: 176px;
}

.person__hair {
  position: absolute;
  left: 35px;
  top: 0;
  width: 82px;
  height: 96px;
  background: #4e6172;
  border-radius: 42px 42px 26px 26px;
}

.person__face {
  position: absolute;
  left: 47px;
  top: 30px;
  width: 58px;
  height: 62px;
  background: #ffd7bd;
  border-radius: 50% 50% 45% 45%;
}

.person__face::before,
.person__face::after {
  content: "";
  position: absolute;
  top: 27px;
  width: 6px;
  height: 6px;
  background: #173456;
  border-radius: 50%;
}

.person__face::before { left: 16px; }
.person__face::after { right: 16px; }

.person__body {
  position: absolute;
  left: 20px;
  bottom: 0;
  width: 110px;
  height: 92px;
  background: linear-gradient(135deg, #57b77b, #2e8f62);
  border-radius: 42px 42px 18px 18px;
}

.desk {
  position: absolute;
  right: 36px;
  bottom: 38px;
  left: 36px;
  height: 96px;
  background: #f2bd73;
  border-radius: 18px;
  box-shadow: inset 0 -12px 0 rgba(163, 96, 34, 0.1);
}

.laptop {
  position: absolute;
  left: 74px;
  bottom: 40px;
  width: 172px;
}

.laptop__screen {
  display: grid;
  place-items: center;
  height: 102px;
  color: #ffffff;
  font-size: 1.7rem;
  font-weight: 900;
  background: linear-gradient(135deg, #173456, #2878c7);
  border: 8px solid #e7eef6;
  border-radius: 14px 14px 7px 7px;
}

.laptop__base {
  height: 18px;
  background: #d8e3ed;
  border-radius: 0 0 18px 18px;
}

.mug {
  position: absolute;
  right: 54px;
  bottom: 36px;
  width: 34px;
  height: 38px;
  background: #ffffff;
  border: 3px solid #b8d2e7;
  border-radius: 8px 8px 12px 12px;
}

.mug::after {
  content: "";
  position: absolute;
  right: -15px;
  top: 9px;
  width: 15px;
  height: 16px;
  border: 3px solid #b8d2e7;
  border-left: 0;
  border-radius: 0 12px 12px 0;
}

.sparkle {
  position: absolute;
  color: var(--orange);
  font-size: 2rem;
  font-weight: 900;
}

.sparkle--one { right: 132px; top: 122px; }
.sparkle--two { left: 96px; bottom: 168px; color: var(--green); }

.sub-hero {
  position: relative;
  overflow: hidden;
  padding: 72px 22px 62px;
  background:
    radial-gradient(circle at 12% 16%, rgba(242, 154, 63, 0.18), transparent 25%),
    linear-gradient(135deg, #ffffff, #eaf6ff);
}

.sub-hero--green {
  background:
    radial-gradient(circle at 84% 14%, rgba(242, 154, 63, 0.16), transparent 25%),
    linear-gradient(135deg, #ffffff, #edf9f2);
}

.sub-hero--orange {
  background:
    radial-gradient(circle at 84% 14%, rgba(40, 120, 199, 0.14), transparent 25%),
    linear-gradient(135deg, #ffffff, #fff5e7);
}

.sub-hero__inner {
  max-width: 900px;
  margin: 0 auto;
}

.sub-hero h1 {
  margin: 0 0 14px;
  color: var(--navy);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.25;
  letter-spacing: 0;
}

.sub-hero p:last-child {
  max-width: 680px;
  margin: 0;
  color: var(--text);
  font-size: 1.08rem;
}

.article {
  max-width: 900px;
  margin: 0 auto;
  padding: 54px 22px 80px;
}

.article-section,
.steps-section,
.points,
.link-section {
  margin-bottom: 42px;
  padding: 34px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid #d7ebf9;
  border-radius: 18px;
  box-shadow: 0 12px 34px rgba(35, 81, 118, 0.08);
}

.home-page--calm .article-section,
.home-page--calm .points,
.home-page--calm .link-section {
  background: rgba(255, 255, 255, 0.82);
  border-color: rgba(178, 200, 242, 0.76);
  box-shadow: 0 18px 42px rgba(82, 109, 160, 0.12);
}

.home-page--warm .article-section,
.home-page--warm .points,
.home-page--warm .link-section {
  background: rgba(255, 255, 255, 0.84);
  border-color: rgba(230, 202, 169, 0.82);
  box-shadow: 0 18px 42px rgba(128, 93, 56, 0.11);
}

.article-section h2,
.points h2 {
  margin: 0 0 16px;
  color: var(--navy);
  font-size: clamp(1.35rem, 4vw, 1.8rem);
  line-height: 1.5;
}

.article-section:nth-of-type(2) h2 { color: var(--blue); }
.article-section:nth-of-type(3) h2 { color: var(--green); }
.article-section:nth-of-type(4) h2 { color: var(--orange); }

.article-section p {
  margin: 0 0 18px;
  font-size: 1.04rem;
}

.article-section p:last-child {
  margin-bottom: 0;
}

.intro-section {
  background: linear-gradient(135deg, #ffffff, #f3fbff);
}

.intro-next-heading {
  margin: 26px 0 0;
  color: var(--blue);
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  line-height: 1.5;
}

.home-page--calm .intro-section {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(241, 245, 255, 0.9));
}

.home-page--warm .intro-section {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 247, 235, 0.92));
}

.goal-box {
  display: grid;
  gap: 8px;
  margin-top: 22px;
  padding: 20px;
  background: #fff8eb;
  border: 1px solid #f6d49e;
  border-radius: 16px;
}

.home-page--calm .goal-box {
  background: #f6f4ff;
  border-color: #d8d1fb;
}

.home-page--warm .goal-box {
  background: #fff4e8;
  border-color: #f0cba8;
}

.goal-box span {
  justify-self: start;
  padding: 3px 10px;
  color: #ffffff;
  font-size: 0.86rem;
  font-weight: 900;
  background: var(--orange);
  border-radius: 999px;
}

.goal-box strong {
  color: var(--navy);
  line-height: 1.8;
}

.tool-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 22px;
  padding: 0;
  list-style: none;
}

.tool-list li {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 10px 16px;
  font-weight: 800;
  background: #f4fbff;
  border: 1px solid #cfe6f7;
  border-radius: 14px;
}

.home-page--calm .tool-list li {
  background: #f7f9ff;
  border-color: #d9e3fb;
}

.home-page--warm .tool-list li {
  background: #fff8ef;
  border-color: #efd9bf;
}

.tool-list li::before {
  content: "✓";
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-right: 10px;
  color: #ffffff;
  background: var(--green);
  border-radius: 50%;
}

.section-heading {
  margin-bottom: 26px;
  text-align: center;
}

.section-heading p {
  margin: 0 0 8px;
  color: var(--green);
  font-weight: 800;
}

.section-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.45;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.steps-grid--six .step-card {
  min-height: 320px;
}

.plus-steps-list {
  display: grid;
  gap: 30px;
}

.plus-step-detail {
  position: relative;
  overflow: hidden;
  padding: 31px 34px;
  background: linear-gradient(145deg, #ffffff, #f5fbf8);
  border: 1px solid #cfe4d7;
  border-left: 4px solid #3da66b;
  border-radius: 3px 20px 3px 20px;
  box-shadow: 0 14px 32px rgba(35,81,118,.09);
}

.plus-steps-grid {
  align-items: stretch;
  gap: 20px;
}

.plus-steps-grid .plus-step-card {
  min-height: 0;
  padding: 20px;
  background: linear-gradient(145deg, #ffffff, #f5fbf8);
  border: 1px solid #cfe4d7;
  border-top: 4px solid #3da66b;
  border-radius: 14px;
  box-shadow: 0 12px 27px rgba(35,81,118,.09);
}

.plus-steps-grid--first-check {
  grid-template-columns: 1fr;
}

.plus-step-card .step-card__number {
  margin-bottom: 10px;
  background: linear-gradient(135deg, #24764b, #3da66b);
  border: 1px solid #d3ae5e;
}

.plus-step-card h3 {
  margin: 0 0 9px;
  color: #173f65;
  font-size: 1.05rem;
  line-height: 1.5;
}

.plus-step-card > p:not(.step-caution) {
  margin: 0 0 12px;
  color: #5e7384;
  font-size: .9rem;
  line-height: 1.75;
}

.plus-step-card .step-image {
  width: 100%;
  max-width: 100%;
  margin: auto 0 14px;
  border-radius: 8px;
  box-shadow: 0 5px 14px rgba(0,0,0,.07);
}

.plus-step-card .step-image--plus-first-check {
  width: 100%;
  max-width: 860px;
  height: auto;
  display: block;
  margin: 1.5rem auto 1.75rem;
  border-radius: 12px;
  object-fit: contain;
}

.plus-step-card .step-caution {
  margin-top: 0;
  padding: 12px 12px 12px 38px;
  font-size: .8rem;
  line-height: 1.65;
}

.plus-step-card .step-caution::before {
  left: 11px;
  top: 12px;
  width: 19px;
  height: 19px;
  font-size: .7rem;
}

@media (max-width: 920px) {
  .plus-steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .plus-steps-grid {
    grid-template-columns: 1fr;
  }

  .plus-steps-grid .plus-step-card {
    padding: 18px;
  }
}

/* ChatGPT Plus: beginner-friendly usage guide */
.plus-usage-guide {
  padding: 34px;
}

.plus-usage-guide__lead {
  max-width: 900px;
  margin: 16px auto 0;
  padding: 18px 22px;
  color: #263c52;
  line-height: 1.9;
  background: linear-gradient(135deg, #f4fbfc, #fff);
  border: 1px solid #cfe8e8;
  border-radius: 14px;
}

.plus-usage-guide__lead strong {
  color: #087d86;
}

.plus-usage-topics {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.plus-usage-card {
  position: relative;
  padding: 28px 30px 30px;
  overflow: hidden;
  background: linear-gradient(145deg, #fff 0%, #fbfefe 100%);
  border: 1px solid #d8e7e8;
  border-left: 5px solid #168b94;
  border-radius: 16px;
  box-shadow: 0 10px 26px rgba(12, 58, 83, .07);
}

.plus-usage-card__number {
  display: inline-block;
  margin-bottom: 7px;
  color: #a66f05;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .12em;
}

.plus-usage-card h4 {
  margin: 0 0 20px;
  color: #082f67;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.22rem, 2.6vw, 1.6rem);
  line-height: 1.45;
}

.usage-description,
.usage-tip,
.usage-operation,
.usage-prompt,
.usage-followup {
  margin-top: 16px;
  padding: 17px 19px;
  border-radius: 12px;
}

.usage-description {
  background: #f7fafb;
  border: 1px solid #e2eaed;
}

.usage-description > strong,
.usage-tip > strong,
.usage-operation > strong,
.usage-prompt > strong,
.usage-followup > strong {
  display: block;
  margin-bottom: 7px;
  color: #082f67;
}

.usage-description p,
.usage-tip p,
.usage-prompt p,
.usage-followup p {
  margin: 0;
  line-height: 1.85;
}

.usage-check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 18px;
  margin: 17px 0 0;
}

.usage-check-list li {
  min-height: 0;
  padding: 10px 12px 10px 35px;
  background: #fff;
  border: 1px solid #dce9ea;
  border-radius: 9px;
}

.usage-theme-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.usage-theme-item {
  position: relative;
  padding: 17px 19px 17px 52px;
  background: #fff;
  border: 1px solid #dce9ea;
  border-radius: 11px;
}

.usage-theme-item::before {
  content: "✓";
  position: absolute;
  top: 17px;
  left: 18px;
  display: grid;
  width: 23px;
  height: 23px;
  color: #fff;
  font-size: .78rem;
  font-weight: 800;
  place-items: center;
  background: #168b94;
  border-radius: 50%;
}

.usage-theme-item h5 {
  margin: 0 0 6px;
  color: #082f67;
  font-size: 1rem;
  line-height: 1.5;
}

.usage-theme-item p {
  margin: 0;
  color: #40566a;
  line-height: 1.75;
}

.usage-tip {
  color: #594617;
  background: #fffaf0;
  border: 1px solid #ecd9a5;
}

.usage-operation {
  background: #f1f8fd;
  border: 1px solid #cfe1ef;
}

.usage-operation ol {
  display: grid;
  gap: 8px;
  margin: 10px 0 0;
  padding-left: 1.5em;
  line-height: 1.7;
}

.usage-operation li::marker {
  color: #168b94;
  font-weight: 800;
}

.usage-prompt {
  position: relative;
  color: #173d44;
  background: linear-gradient(135deg, #eefaf8, #f8fcff);
  border: 1px dashed #55aeb2;
}

.usage-prompt p {
  padding-left: 13px;
  border-left: 3px solid #c99b37;
  white-space: pre-wrap;
}

.prompt-result-example {
  margin-top: 16px;
  padding: 17px 19px;
  background: #f8fbff;
  border: 1px solid rgba(22, 139, 148, .22);
  border-radius: 12px;
}

.prompt-result-example h5 {
  margin: 0 0 10px;
  color: #082f67;
  font-size: 1rem;
  line-height: 1.5;
}

.prompt-result-example > p {
  margin: 0 0 13px;
  color: #40566a;
  line-height: 1.8;
}

.sample-output-card {
  margin: 13px 0;
  padding: 16px 18px;
  color: #233d54;
  background: #fff;
  border: 1px solid #d8e7ef;
  border-radius: 10px;
}

.sample-output-card h6 {
  margin: 0 0 10px;
  color: #082f67;
  font-size: .98rem;
  line-height: 1.5;
}

.sample-output-card h6:not(:first-child) {
  margin-top: 16px;
}

.sample-output-card p {
  margin: 0 0 11px;
  line-height: 1.8;
}

.sample-output-card p:last-child {
  margin-bottom: 0;
}

.prompt-result-note {
  padding: 12px 14px;
  background: #f1f8fd;
  border-left: 4px solid #168b94;
}

.usage-followup {
  background: #fff7f1;
  border: 1px solid #efd7c5;
}

.usage-input-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 17px;
}

.usage-input-compare > div {
  padding: 16px 18px;
  background: #f7fbfc;
  border: 1px solid #d7e7e9;
  border-radius: 12px;
}

.usage-input-compare strong {
  display: block;
  margin-bottom: 6px;
  color: #087d86;
}

.usage-input-compare p {
  margin: 0;
  line-height: 1.75;
}

.usage-summary {
  margin-top: 28px;
}

@media (max-width: 640px) {
  .plus-usage-guide { padding: 22px 15px; }
  .plus-usage-guide__lead { padding: 16px; }
  .plus-usage-card { padding: 23px 17px 24px; }
  .usage-check-list,
  .usage-input-compare { grid-template-columns: 1fr; }
  .usage-description,
  .usage-tip,
  .usage-operation,
  .usage-prompt,
  .usage-followup { padding: 15px; }
  .usage-theme-item { padding: 16px 15px 16px 48px; }
  .usage-theme-item::before { left: 15px; }
}

.plus-step-detail::after {
  content: "";
  position: absolute;
  right: -42px;
  top: -42px;
  width: 105px;
  height: 105px;
  border: 14px double rgba(61,166,107,.10);
  border-radius: 50%;
}

.plus-step-detail .step-card__number {
  position: relative;
  z-index: 1;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #24764b, #3da66b);
  border: 1px solid #d3ae5e;
}

.plus-step-detail h3 {
  position: relative;
  z-index: 1;
  margin: 0 0 13px;
  color: #173f65;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.25rem, 3.5vw, 1.6rem);
  line-height: 1.5;
}

.plus-step-detail > p:not(.step-caution) {
  position: relative;
  z-index: 1;
  margin: 0 0 10px;
}

.step-image {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 700px;
  height: auto;
  margin: 24px auto;
  background: #fff;
  border: 1px solid #dfe7e2;
  border-radius: 12px;
  box-shadow: 0 7px 20px rgba(0,0,0,.08);
}

.step-caution {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  padding: 15px 17px 15px 45px;
  color: #6d511a;
  font-size: .94rem;
  font-weight: 700;
  background: #fff8e7;
  border: 1px solid #ecd49e;
  border-radius: 3px 13px 3px 13px;
}

.step-caution::before {
  content: "!";
  position: absolute;
  left: 14px;
  top: 14px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  color: #fff;
  background: #d69a37;
  border-radius: 50%;
}

.step-caution--security {
  color: #204c66;
  background: #eef8fb;
  border-color: #bedde7;
}

.step-caution--security::before { background: #2878c7; }

@media (max-width: 640px) {
  .plus-step-detail { padding: 25px 18px; }
  .step-image { margin: 19px auto; border-radius: 9px; }
}

.page-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-link-card {
  display: grid;
  gap: 12px;
  min-height: 260px;
  padding: 24px;
  color: var(--text);
  text-decoration: none;
  background: linear-gradient(135deg, #ffffff, #f3fbff);
  border: 1px solid #cfe6f7;
  border-radius: 18px;
  box-shadow: 0 14px 30px rgba(35, 81, 118, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.home-page--calm .page-link-card {
  background: linear-gradient(135deg, #ffffff, #f5f7ff);
  border-color: #d8e2fb;
}

.home-page--warm .page-link-card {
  background: linear-gradient(135deg, #ffffff, #fff7ed);
  border-color: #efd8bd;
}

.page-link-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 38px rgba(35, 81, 118, 0.15);
}

.page-link-card--green {
  background: linear-gradient(135deg, #ffffff, #f0fbf5);
}

.page-link-card--orange {
  background: linear-gradient(135deg, #ffffff, #fff8eb);
}

.page-link-card__icon {
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  color: #ffffff;
  font-weight: 900;
  background: var(--blue);
  border-radius: 18px;
}

.page-link-card--green .page-link-card__icon {
  background: var(--green);
}

.page-link-card--orange .page-link-card__icon {
  background: var(--orange);
}

.page-link-card strong {
  color: var(--navy);
  font-size: 1.28rem;
  line-height: 1.45;
}

.page-link-card p {
  margin: 0;
  color: var(--muted);
}

.page-link-card__button {
  align-self: end;
  justify-self: start;
  padding: 8px 14px;
  color: #ffffff;
  font-weight: 900;
  background: var(--orange);
  border-radius: 999px;
}

.step-card {
  display: flex;
  flex-direction: column;
  min-height: 340px;
  padding: 20px;
  background: var(--white);
  border: 1px solid #cfe6f7;
  border-radius: 16px;
  box-shadow: 0 14px 26px rgba(35, 81, 118, 0.09);
}

/* ChatGPT Plus beginner introduction */
.plus-introduction {
  margin-bottom: 48px;
  padding: 42px;
  background:
    radial-gradient(circle at 94% 6%, rgba(23,139,147,.12), transparent 20%),
    linear-gradient(145deg, rgba(255,255,255,.97), rgba(244,251,251,.94));
  border: 1px solid #dfcf9d;
  border-radius: 4px 28px 4px 28px;
  box-shadow: 0 18px 44px rgba(35,81,118,.10);
}

.page-catch-image {
  position: relative;
  z-index: 2;
  width: min(1120px, calc(100% - 36px));
  margin: 42px auto 8px;
  padding: 7px;
  background: #fff;
  border: 1px solid #bddde6;
  border-radius: 4px 23px 4px 23px;
  box-shadow: 0 20px 52px rgba(35,81,118,.14);
}

.page-catch-image::before,
.page-catch-image::after {
  content: "◆";
  position: absolute;
  color: #c99b37;
  background: #fff;
}

.page-catch-image::before { left: -8px; top: -10px; }
.page-catch-image::after { right: -8px; bottom: -10px; }

.page-catch-image img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 2px 17px 2px 17px;
}

.page-top-image {
  width: min(1200px, calc(100% - 30px));
  margin-top: 30px;
  margin-bottom: 18px;
}

@media (max-width: 640px) {
  .page-catch-image {
    width: calc(100% - 20px);
    margin-top: 24px;
    padding: 4px;
    border-radius: 3px 14px 3px 14px;
  }
  .page-catch-image img { border-radius: 2px 10px 2px 10px; }
}

.plus-introduction__lead {
  max-width: 760px;
  margin: 0 auto 32px;
  padding: 20px 23px;
  color: #28465d;
  font-weight: 700;
  background: #f2fafb;
  border-left: 4px solid #178b93;
  border-radius: 0 14px 0 14px;
}

.plus-guide-grid {
  display: grid;
  gap: 24px;
}

.plus-guide-card {
  position: relative;
  overflow: hidden;
  padding: 31px 32px;
  background: rgba(255,255,255,.96);
  border: 1px solid #d6e6e8;
  border-left: 4px solid #178b93;
  border-radius: 2px 20px 2px 20px;
  box-shadow: 0 11px 28px rgba(35,81,118,.07);
}

.plus-guide-card::after {
  content: "";
  position: absolute;
  right: -38px;
  top: -38px;
  width: 95px;
  height: 95px;
  border: 13px double rgba(23,139,147,.10);
  border-radius: 50%;
}

.plus-guide-card__number {
  display: inline-block;
  margin-bottom: 9px;
  color: #c18d2d;
  font-family: Georgia, serif;
  font-size: 1.45rem;
}

.plus-guide-card h3 {
  position: relative;
  margin: 0 0 23px;
  padding-bottom: 12px;
  color: #173f65;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.35rem, 3.5vw, 1.75rem);
}

.plus-guide-card h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 110px;
  height: 2px;
  background: linear-gradient(90deg, #c99b37, #178b93, transparent);
}

.plus-guide-card p { margin: 0 0 16px; }
.plus-guide-card p:last-child { margin-bottom: 0; }

.plus-check-list,
.plus-caution-list,
.plus-note-list,
.plus-step-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 22px;
  padding: 0;
  list-style: none;
}

.plus-check-list { grid-template-columns: repeat(2,minmax(0,1fr)); }

.plus-check-list li,
.plus-caution-list li,
.plus-note-list li,
.plus-step-list li {
  position: relative;
  padding: 12px 15px 12px 43px;
  background: #f5fbfc;
  border: 1px solid #dcebed;
  border-radius: 3px 13px 3px 13px;
}

.plus-check-list li::before,
.plus-caution-list li::before,
.plus-note-list li::before,
.plus-step-list li::before {
  position: absolute;
  left: 13px;
  top: 12px;
  display: grid;
  place-items: center;
  width: 21px;
  height: 21px;
  color: #fff;
  font-size: .76rem;
  font-weight: 900;
  background: #178b93;
  border-radius: 50%;
}

.plus-check-list li::before { content: "✓"; }
.plus-caution-list li::before { content: "!"; background: #d49a3e; }
.plus-note-list li::before { content: "i"; background: #2878c7; }

.plus-step-list { counter-reset: plus-step; }
.plus-step-list li { counter-increment: plus-step; }
.plus-step-list li::before { content: counter(plus-step); background: linear-gradient(135deg,#173f65,#178b93); }

.plus-example-box {
  padding: 19px 21px;
  background: #fff9ec;
  border: 1px solid #ead19b;
  border-radius: 2px 14px 2px 14px;
}

.plus-example-box strong { color: #173f65; }
.plus-example-box p { margin: 7px 0 0; }

.plus-guide-card--cannot { border-left-color: #d49a3e; }
.plus-guide-card--notice { border-left-color: #2878c7; }
.plus-guide-card--tips { border-left-color: #62a876; }


.plus-beginner-summary {
  margin-top: 28px;
  padding: 27px 30px;
  color: #173f65;
  text-align: center;
  background: linear-gradient(135deg,#fff8e8,#eaf8f6);
  border: 1px solid #c99b37;
  border-radius: 3px 20px 3px 20px;
  box-shadow: inset 0 0 0 6px rgba(255,255,255,.55);
}

.plus-beginner-summary > span {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 13px;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg,#173f65,#178b93);
  border: 1px solid #c99b37;
  border-radius: 2px 12px 2px 12px;
}

.plus-beginner-summary p { margin: 0 0 11px; }
.plus-beginner-summary p:last-child { margin-bottom: 0; }

/* OBS beginner introduction variations */
.obs-introduction {
  background:
    radial-gradient(circle at 94% 6%, rgba(61,166,107,.13), transparent 20%),
    linear-gradient(145deg, rgba(255,255,255,.97), rgba(241,250,245,.95));
  border-color: #b9d8c4;
}

.obs-introduction .plus-introduction__lead {
  background: #f0faf4;
  border-left-color: #3da66b;
}

.obs-guide-card {
  border-color: #d3e8db;
  border-left-color: #3da66b;
}

.obs-guide-card::after {
  border-color: rgba(61,166,107,.11);
}

.obs-guide-card h3::after {
  background: linear-gradient(90deg, #c99b37, #3da66b, transparent);
}

.obs-guide-card--cannot { border-left-color: #d49a3e; }
.obs-guide-card--notice { border-left-color: #2878c7; }
.obs-guide-card--tips { border-left-color: #178b93; }

.obs-guide-card__mini-title {
  margin: 25px 0 12px;
  color: #2b7953;
  font-size: 1.08rem;
}

.obs-guide-card__mini-title:first-of-type { margin-top: 0; }

.obs-beginner-summary {
  background: linear-gradient(135deg, #fff9e9, #eaf8ef);
  border-color: #87bd99;
}

.obs-beginner-summary > span {
  background: linear-gradient(135deg, #245b42, #3da66b);
}

.obs-trouble-section {
  margin: 42px 0;
  padding: 38px;
  background:
    radial-gradient(circle at 94% 7%, rgba(61, 166, 107, .14), transparent 24%),
    linear-gradient(145deg, rgba(255,255,255,.98), rgba(241,250,245,.96));
  border: 1px solid #b9d8c4;
  border-radius: 3px 26px 3px 26px;
  box-shadow: 0 16px 40px rgba(8,47,103,.08);
}

.obs-trouble-section .section-heading {
  margin-bottom: 26px;
}

.obs-trouble-lead {
  margin: 0 0 24px;
  padding: 22px 24px;
  color: #24445c;
  background: #f0faf4;
  border-left: 4px solid #3da66b;
  border-radius: 2px 16px 2px 16px;
}

.obs-trouble-card {
  margin-top: 26px;
  padding: 26px;
  background: linear-gradient(135deg, #fffdf8, #f4fbfb);
  border: 1px solid #d3e8db;
  border-left: 4px solid #3da66b;
  border-radius: 3px 18px 3px 18px;
  box-shadow: 0 10px 24px rgba(8,47,103,.06);
}

.obs-trouble-card h3 {
  margin: 0 0 18px;
  color: #0b3a5b;
  font-family: "Yu Mincho","Hiragino Mincho ProN",serif;
  font-size: 1.45rem;
  line-height: 1.55;
}

.obs-trouble-card h4 {
  margin: 24px 0 12px;
  color: #2b7953;
  font-size: 1.08rem;
}

.obs-trouble-card h4:first-of-type {
  margin-top: 0;
}

.obs-trouble-card p {
  margin: 0 0 14px;
}

.obs-trouble-card ol,
.obs-trouble-card ul {
  margin: 0 0 18px;
  padding-left: 1.35em;
}

.obs-trouble-card li {
  margin: 7px 0;
}

.obs-note-box {
  margin: 18px 0;
  padding: 17px 19px;
  color: #24445c;
  background: #fff9e9;
  border: 1px solid #d8c17f;
  border-radius: 3px 15px 3px 15px;
}

.obs-checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0 20px;
  padding: 0;
  list-style: none;
}

.obs-checklist li {
  position: relative;
  margin: 0;
  padding: 12px 14px 12px 41px;
  background: #fff;
  border: 1px solid #d7e8e6;
  border-radius: 3px 12px 3px 12px;
}

.obs-checklist li::before {
  content: "□";
  position: absolute;
  left: 13px;
  top: 11px;
  color: #178b93;
  font-weight: 900;
}

body.obs-page kbd,
body.content-page kbd {
  display: inline-block;
  padding: 0.15em 0.45em;
  margin: 0 0.1em;
  font-size: 0.9em;
  font-family: inherit;
  line-height: 1.4;
  color: #333;
  background: #f7f7f7;
  border: 1px solid #cfcfcf;
  border-radius: 6px;
  box-shadow: 0 2px 0 #b8b8b8;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .plus-introduction { padding: 28px 18px; }
  .plus-guide-card { padding: 25px 20px; }
  .plus-check-list { grid-template-columns: 1fr; }
  .plus-beginner-summary { padding: 24px 18px; text-align: left; }
  .obs-trouble-section { padding: 28px 18px; }
  .obs-trouble-card { padding: 22px 18px; }
  .obs-checklist { grid-template-columns: 1fr; }
}

.step-card__number {
  align-self: flex-start;
  margin-bottom: 10px;
  padding: 3px 10px;
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 900;
  background: var(--blue);
  border-radius: 999px;
}

.step-card h3 {
  margin: 0 0 8px;
  color: var(--navy);
  font-size: 1.1rem;
  line-height: 1.45;
}

.step-card p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.75;
}

.step-screenshot {
  display: grid;
  place-items: center;
  margin: auto 0 0;
  background: #f6fbff;
  border: 1px solid #dbeefa;
  border-radius: 13px;
  overflow: hidden;
}

.step-screenshot--tight {
  padding: 0;
}

.step-screenshot img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: auto;
  border-radius: 12px;
}

.steps-grid .step-card:nth-child(-n + 9) .step-screenshot img {
  width: 100%;
}

.steps-grid .step-card:nth-child(-n + 9) .step-screenshot {
  margin: 8px -12px -8px;
}

.mock {
  display: grid;
  align-content: center;
  gap: 10px;
  min-height: 126px;
  margin-top: auto;
  padding: 14px;
  background: #f6fbff;
  border: 1px solid #dbeefa;
  border-radius: 13px;
}

.mock-search__bar,
.path-input {
  padding: 9px 12px;
  color: var(--navy);
  background: #ffffff;
  border: 1px solid #bcd8eb;
  border-radius: 999px;
}

.mock-search__result {
  padding: 10px;
  color: var(--blue);
  font-weight: 800;
  background: #ffffff;
  border-left: 4px solid var(--green);
  border-radius: 8px;
}

.mock-site {
  justify-items: center;
}

.mock-site__logo {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  color: #ffffff;
  font-weight: 900;
  background: #26394f;
  border-radius: 50%;
}

.mock-site__title {
  color: var(--navy);
  font-weight: 900;
}

.mock-site__line {
  width: 84%;
  height: 8px;
  background: #cfe6f7;
  border-radius: 999px;
}

.mock-site__line.short {
  width: 58%;
}

.mock-os {
  grid-template-columns: 1fr;
}

.mock-os button,
.primary-button,
.small-button {
  cursor: default;
  color: var(--navy);
  font-weight: 800;
  background: #ffffff;
  border: 1px solid #bdd9ec;
  border-radius: 10px;
}

.mock-os button {
  padding: 9px;
}

.highlight {
  border: 3px solid var(--red) !important;
  box-shadow: 0 0 0 4px rgba(232, 72, 72, 0.12);
}

.primary-button {
  padding: 13px 12px;
  color: #ffffff;
  background: var(--blue);
}

.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  color: var(--navy);
  font-size: 0.9rem;
  font-weight: 800;
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 10px;
}

.file-icon {
  width: 28px;
  height: 34px;
  background: linear-gradient(135deg, #ffffff 0 72%, #d8e9f7 72%);
  border: 2px solid var(--blue);
  border-radius: 5px;
}

.window-title {
  padding: 8px 10px;
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 800;
  background: var(--navy);
  border-radius: 9px 9px 0 0;
}

.window-body {
  height: 44px;
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-top: 0;
}

.small-button {
  justify-self: end;
  min-width: 82px;
  padding: 7px 12px;
  color: #ffffff;
  background: var(--blue);
}

.text-box {
  display: grid;
  gap: 7px;
  padding: 12px;
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 10px;
}

.text-box span {
  height: 8px;
  background: #dceaf6;
  border-radius: 999px;
}

.text-box span:nth-child(3) {
  width: 78%;
}

.text-box span:nth-child(4) {
  width: 64%;
}

.mock-path .path-input {
  overflow-wrap: anywhere;
  border-radius: 10px;
  font-size: 0.82rem;
}

.mock-complete {
  justify-items: center;
}

.complete-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  color: #ffffff;
  font-size: 2rem;
  font-weight: 900;
  background: var(--green);
  border-radius: 50%;
}

.complete-text {
  color: var(--navy);
  font-weight: 900;
}

.mock-chat-home {
  justify-items: center;
}

.chat-logo {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  color: #ffffff;
  font-weight: 900;
  background: linear-gradient(135deg, var(--green), var(--blue));
  border-radius: 50%;
}

.chat-input {
  width: 100%;
  padding: 9px 12px;
  color: var(--muted);
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 999px;
}

.mock-profile {
  grid-template-columns: 70px 1fr;
  align-items: center;
}

.profile-circle {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  color: #ffffff;
  font-weight: 900;
  background: var(--navy);
  border-radius: 50%;
}

.profile-menu,
.mock-upgrade {
  display: grid;
  gap: 8px;
}

.profile-menu span,
.menu-row {
  padding: 8px 10px;
  color: var(--navy);
  font-weight: 800;
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 9px;
}

.mock-plan .plan-card {
  display: grid;
  gap: 8px;
  padding: 14px;
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 12px;
}

.mock-plan strong {
  color: var(--navy);
  font-size: 1.2rem;
}

.mock-plan span {
  color: var(--muted);
  font-size: 0.86rem;
}

.mock-payment {
  gap: 9px;
}

.payment-field,
.payment-row span {
  padding: 9px 10px;
  color: var(--muted);
  background: #ffffff;
  border: 1px solid #cfe6f7;
  border-radius: 9px;
}

.payment-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.note-text {
  margin: 22px 0 0;
  padding: 16px 18px;
  color: var(--navy);
  font-size: 0.96rem;
  font-weight: 700;
  background: #fff8eb;
  border: 1px solid #f6d49e;
  border-radius: 14px;
}

.next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 42px;
}

.next-links a {
  padding: 11px 18px;
  color: #ffffff;
  font-weight: 900;
  text-decoration: none;
  background: var(--blue);
  border-radius: 999px;
  box-shadow: 0 12px 24px rgba(35, 81, 118, 0.14);
}

.next-links a:nth-child(even) {
  background: var(--green);
}

.points {
  background: linear-gradient(135deg, #ffffff, #f0fbf5);
}

.points__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.point-box {
  min-height: 126px;
  padding: 20px 16px;
  color: var(--navy);
  font-weight: 800;
  text-align: center;
  background: #ffffff;
  border: 1px solid #d7ebf9;
  border-radius: 16px;
}

.point-box span {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin: 0 auto 12px;
  color: #ffffff;
  font-size: 1.2rem;
  background: var(--orange);
  border-radius: 50%;
}

.point-box:nth-child(even) span {
  background: var(--green);
}

.message-box {
  margin-top: 24px;
  padding: 22px;
  color: var(--navy);
  font-size: 1.12rem;
  font-weight: 900;
  text-align: center;
  background: #e7f4ff;
  border: 2px solid #bde2fb;
  border-radius: 16px;
}

.home-page--calm .message-box {
  background: #eef4ff;
  border-color: #cbdcf8;
}

.home-page--warm .message-box {
  background: #fff1e4;
  border-color: #f0c7a4;
}

.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 10;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: #ffffff;
  font-size: 1.4rem;
  font-weight: 900;
  background: var(--blue);
  border: 0;
  border-radius: 50%;
  box-shadow: 0 12px 24px rgba(23, 52, 86, 0.22);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }

  .learning-illustration {
    max-width: 480px;
    width: 100%;
    margin: 0 auto;
  }

  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .points__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 24px 12px 38px;
  }

  .hero__main-image {
    border-radius: 16px;
  }

  .hero__badge {
    width: 122px;
    height: 122px;
    font-size: 0.9rem;
  }

  .learning-illustration {
    min-height: 340px;
    padding: 18px;
    border-radius: 18px;
  }

  .speech-bubble {
    left: 16px;
    top: 20px;
    font-size: 0.9rem;
  }

  .checklist {
    right: 16px;
    top: 24px;
    width: 96px;
  }

  .person {
    left: 50%;
    bottom: 106px;
    transform: translateX(-50%) scale(0.86);
  }

  .desk {
    right: 18px;
    left: 18px;
    bottom: 24px;
  }

  .laptop {
    left: 32px;
    width: 150px;
  }

  .article {
    padding: 34px 14px 64px;
  }

  .article-section,
  .steps-section,
  .points,
  .link-section {
    padding: 24px 18px;
    border-radius: 16px;
  }

  .tool-list,
  .steps-grid,
  .points__grid {
    grid-template-columns: 1fr;
  }

  .step-card {
    min-height: auto;
  }

  .point-box {
    min-height: 96px;
  }
}

/* =========================================================
   Reusable blog article format / archive
   ========================================================= */

.article-feature-link {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  margin-top: 24px;
  padding: 22px 25px;
  color: var(--deep-navy, #082f67);
  text-decoration: none;
  background: linear-gradient(120deg, #fffdf8, #eefafb);
  border: 1px solid var(--gold, #c99b37);
  border-radius: 2px 20px 2px 20px;
  box-shadow: 0 12px 28px rgba(8,47,103,.09);
}

.article-feature-link::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 7px;
  height: 1px;
  background: linear-gradient(90deg, transparent, #c99b37, transparent);
}

.article-feature-link__label {
  padding: 5px 10px;
  color: #fff;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .12em;
  background: linear-gradient(135deg, #082f67, #178b93);
  border: 1px solid #c99b37;
}

.article-feature-link strong {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  line-height: 1.55;
}

.article-feature-link > span:last-child {
  color: #178b93;
  font-weight: 900;
  white-space: nowrap;
}

.content-page {
  --gold: #c99b37;
  --gold-light: #ead9a2;
  --deep-navy: #082f67;
  --teal: #178b93;
  --ivory: #fffdf8;
  --ink: #26394e;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, rgba(83,190,218,.15), transparent 24%),
    radial-gradient(circle at 91% 23%, rgba(201,155,55,.12), transparent 25%),
    linear-gradient(rgba(18,115,151,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18,115,151,.03) 1px, transparent 1px),
    linear-gradient(155deg,#f5fbff,#fffdf8 44%,#f4faf8 78%,#fffaf0);
  background-size: auto, auto, 38px 38px, 38px 38px, auto;
}

.content-page .reveal {
  opacity: 1;
  transform: none;
}

.content-page .site-nav {
  background: rgba(255,253,248,.95);
  border-top: 2px solid var(--gold);
  border-bottom-color: rgba(201,155,55,.55);
  box-shadow: 0 8px 28px rgba(8,47,103,.08);
}

.content-page .site-nav__brand {
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: .06em;
}

.content-page .site-nav__links a {
  color: var(--deep-navy);
  background: #fff;
  border-color: var(--gold-light);
  border-radius: 3px 13px 3px 13px;
}

.content-hero {
  position: relative;
  overflow: hidden;
  padding: 90px 22px 82px;
  text-align: center;
  background:
    repeating-radial-gradient(circle at 12% 78%, transparent 0 12px, rgba(23,139,147,.08) 13px 14px),
    linear-gradient(135deg,#f7fcff,#fffaf5 58%,#edf8f4);
  border-bottom: 1px solid var(--gold-light);
}

.content-hero__inner {
  max-width: 850px;
  margin: 0 auto;
}

.content-hero__eyebrow,
.article-hero__category {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 14px;
  color: #fff;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .15em;
  background: linear-gradient(135deg,var(--deep-navy),var(--teal));
  border: 1px solid var(--gold);
  border-radius: 2px 13px 2px 13px;
}

.content-hero h1 {
  margin: 0 0 18px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.2rem,6vw,4rem);
}

.content-hero p:last-child { margin: 0; font-size: 1.08rem; }

.content-main,
.article-layout {
  width: min(1080px, calc(100% - 36px));
  margin: 0 auto;
  padding: 65px 0 90px;
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(3,minmax(0,1fr));
  gap: 25px;
}

.archive-card {
  overflow: hidden;
  background: rgba(255,255,255,.94);
  border: 1px solid var(--gold-light);
  border-radius: 3px 24px 3px 24px;
  box-shadow: 0 18px 42px rgba(8,47,103,.10);
}

.archive-card a { display: block; color: inherit; text-decoration: none; }
.archive-card img { display: block; width: 100%; aspect-ratio: 16/9; object-fit: contain; object-position: center; background: linear-gradient(135deg,#f7fbff,#fffaf5); border-bottom: 1px solid var(--gold-light); }
.archive-card__body { padding: 24px; }
.archive-card__category { color: var(--teal); font-size: .8rem; font-weight: 900; }
.archive-card h2 { margin: 9px 0 12px; color: var(--deep-navy); font-family: "Yu Mincho","Hiragino Mincho ProN",serif; font-size: 1.3rem; line-height: 1.55; }
.archive-card p { margin: 0 0 18px; color: #64768a; font-size: .92rem; }
.archive-card__more { color: var(--teal); font-weight: 900; }

.blog-category-intro {
  position: relative;
  overflow: hidden;
  margin: 0 0 34px;
  padding: 32px;
  background:
    radial-gradient(circle at 12% 18%, rgba(255,255,255,.95), transparent 34%),
    linear-gradient(135deg, rgba(255,255,255,.92), rgba(238,250,255,.9));
  border: 1px solid rgba(216,178,104,.45);
  border-radius: 28px 6px 28px 6px;
  box-shadow: 0 20px 50px rgba(8,47,103,.09);
}

.blog-category-intro::after {
  content: "";
  position: absolute;
  inset: auto -30px -70px auto;
  width: 190px;
  height: 190px;
  background: radial-gradient(circle, rgba(216,178,104,.22), transparent 68%);
  pointer-events: none;
}

.blog-category-intro span,
.blog-category__heading span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--teal);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .14em;
}

.blog-category-intro h2,
.blog-category__heading h2 {
  margin: 9px 0 10px;
  color: var(--deep-navy);
  font-family: "Yu Mincho","Hiragino Mincho ProN",serif;
  line-height: 1.45;
}

.blog-category-intro p,
.blog-category__heading p {
  margin: 0;
  color: #5f7184;
  line-height: 1.9;
}

.blog-category {
  margin: 42px 0 0;
}

.blog-category__heading {
  margin: 0 0 18px;
  padding-left: 18px;
  border-left: 4px solid var(--gold);
}

.archive-card--featured {
  border-radius: 32px 8px 32px 8px;
}

.archive-card--featured a {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  align-items: stretch;
}

.archive-card--featured img {
  height: 100%;
  min-height: 310px;
  aspect-ratio: auto;
  border-right: 1px solid var(--gold-light);
  border-bottom: 0;
}

.archive-card--featured .archive-card__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 36px;
}

.archive-card--featured h2 {
  font-size: clamp(1.45rem, 2.6vw, 2.05rem);
}

.archive-grid--process {
  grid-template-columns: 1fr;
}

.archive-card--process {
  border-radius: 32px 8px 32px 8px;
}

.archive-card--process a {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  align-items: stretch;
  min-height: 310px;
}

.archive-card--process img {
  height: 100%;
  min-height: 310px;
  aspect-ratio: auto;
  border-right: 1px solid var(--gold-light);
  border-bottom: 0;
}

.archive-card--process .archive-card__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 36px;
}

.archive-card--process h2 {
  font-size: clamp(1.45rem, 2.6vw, 2.05rem);
}

.archive-card h2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.archive-card p {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.archive-card__more {
  margin-top: auto;
}

.tool-guide-grid,
.coming-category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.tool-guide-card a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  min-height: 100%;
  padding: 24px;
  color: inherit;
  text-decoration: none;
  background:
    linear-gradient(135deg, rgba(255,255,255,.96), rgba(250,246,235,.94));
  border: 1px solid rgba(216,178,104,.42);
  border-radius: 22px;
  box-shadow: 0 16px 34px rgba(8,47,103,.08);
}

.tool-guide-card__icon {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg, var(--teal), #4aaed1);
  border-radius: 18px 4px 18px 4px;
  box-shadow: 0 10px 22px rgba(25,144,173,.22);
}

.tool-guide-card h3 {
  margin: 8px 0 8px;
  color: var(--deep-navy);
  font-size: 1.15rem;
}

.tool-guide-card p {
  margin: 0 0 14px;
  color: #64768a;
  line-height: 1.75;
  font-size: .92rem;
}

.tool-guide-card strong {
  grid-column: 2;
  color: var(--teal);
  font-size: .92rem;
}

.blog-category--coming {
  padding: 26px;
  background: rgba(255,255,255,.62);
  border: 1px dashed rgba(216,178,104,.65);
  border-radius: 28px;
}

.coming-category-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.coming-category-card {
  padding: 22px;
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(156,185,202,.35);
  border-radius: 20px;
}

.coming-category-card span {
  display: block;
  margin: 0 0 8px;
  color: var(--deep-navy);
  font-weight: 900;
}

.coming-category-card p {
  margin: 0;
  color: #64768a;
  font-size: .9rem;
  line-height: 1.75;
}

.article-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0,.82fr) minmax(460px,1.18fr);
  gap: 42px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 70px 28px 55px;
}

.article-hero::before {
  content: "";
  position: absolute;
  left: -5vw;
  right: -5vw;
  top: 0;
  bottom: 0;
  z-index: -1;
  background: linear-gradient(135deg,#f4fbff,#fffaf0 58%,#edf8f5);
  border-bottom: 1px solid var(--gold-light);
}

.article-hero__copy h1 {
  margin: 0 0 20px;
  color: var(--deep-navy);
  font-family: "Yu Mincho","Hiragino Mincho ProN",serif;
  font-size: clamp(2rem,4.4vw,3.5rem);
  line-height: 1.35;
  letter-spacing: .035em;
}

.article-hero__copy > p:last-child { margin: 0; font-size: 1.04rem; }

.article-hero__image {
  position: relative;
  margin: 0;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--gold);
  box-shadow: 0 20px 52px rgba(8,47,103,.15);
}

.article-hero__image::before,
.article-hero__image::after {
  content: "◆";
  position: absolute;
  color: var(--gold);
  background: var(--ivory);
}

.article-hero__image::before { left: -8px; top: -10px; }
.article-hero__image::after { right: -8px; bottom: -10px; }
.article-hero__image img { display: block; width: 100%; height: auto; }

.article-layout { max-width: 900px; }
.blog-article { min-width: 0; }

.article-lead,
.article-toc,
.blog-section {
  margin-bottom: 38px;
  padding: 38px 42px;
  background: rgba(255,255,255,.94);
  border: 1px solid var(--gold-light);
  border-radius: 3px 26px 3px 26px;
  box-shadow: 0 16px 40px rgba(8,47,103,.08);
}

.article-lead {
  color: var(--deep-navy);
  font-size: 1.08rem;
  font-weight: 700;
  background: linear-gradient(135deg,#fff,#f1faf9);
}

.article-lead p { margin: 0; }

.article-toc strong {
  display: block;
  margin-bottom: 15px;
  color: var(--deep-navy);
  font-family: "Yu Mincho","Hiragino Mincho ProN",serif;
  font-size: 1.45rem;
}

.article-toc ol { margin: 0; padding-left: 1.4em; }
.article-toc li { margin: 7px 0; }
.article-toc a { color: var(--teal); font-weight: 700; text-underline-offset: 4px; }

.blog-section { position: relative; overflow: hidden; }
.blog-section::after { content:""; position:absolute; right:-65px; top:-65px; width:150px; height:150px; border:16px double rgba(23,139,147,.10); border-radius:50%; }
.blog-section__number { margin:0; color:var(--gold); font-family:Georgia,serif; font-size:2.6rem; line-height:1; }
.blog-section > h2 { position:relative; margin:8px 0 34px; padding-bottom:16px; color:var(--deep-navy); font-family:"Yu Mincho","Hiragino Mincho ProN",serif; font-size:clamp(1.65rem,4vw,2.3rem); line-height:1.45; }
.blog-section > h2::after { content:""; position:absolute; left:0; bottom:0; width:150px; height:2px; background:linear-gradient(90deg,var(--gold),var(--teal),transparent); }

.blog-subsection { margin-top:28px; padding:27px 29px; background:linear-gradient(135deg,#fffdf8,#f4fbfb); border-left:3px solid var(--gold); border-radius:0 18px 0 18px; }
.blog-subsection h3 { margin:0 0 22px; color:var(--deep-navy); font-family:"Yu Mincho","Hiragino Mincho ProN",serif; font-size:1.4rem; }
.blog-subsection h3::before { content:"✦"; margin-right:9px; color:var(--gold); }
.blog-subsection h4 { margin:24px 0 10px; color:var(--teal); font-size:1.08rem; }
.blog-subsection h4:first-of-type { margin-top:0; }
.blog-subsection p { margin:0 0 15px; }
.blog-subsection ul { margin:0; padding-left:1.25em; }
.blog-subsection li { margin:7px 0; }


.prompt-box { padding:22px; color:#28445a; white-space:normal; background:#eef8fa; border:1px solid rgba(23,139,147,.28); border-radius:2px 15px 2px 15px; box-shadow:inset 0 0 0 5px rgba(255,255,255,.55); }
.prompt-box::before { content:"PROMPT"; display:block; width:fit-content; margin-bottom:12px; padding:3px 9px; color:#fff; font-size:.72rem; font-weight:900; letter-spacing:.12em; background:linear-gradient(135deg,var(--deep-navy),var(--teal)); border:1px solid var(--gold); }
.blog-article pre { margin:18px 0; padding:18px 20px; overflow-x:auto; color:#21364b; line-height:1.75; white-space:pre; background:#f7fbfc; border:1px solid #d4e6e7; border-radius:3px 14px 3px 14px; box-shadow:inset 0 0 0 4px rgba(255,255,255,.62); }
.blog-article pre code { font-family:"Consolas","Yu Gothic",monospace; font-size:.94rem; white-space:pre; }
.article-summary { margin-top:28px; padding:25px; color:var(--deep-navy); font-weight:800; text-align:center; background:linear-gradient(135deg,#fff7e5,#eaf8f6); border:1px solid var(--gold); border-radius:2px 18px 2px 18px; }

.article-footer-links { display:flex; flex-wrap:wrap; gap:15px; justify-content:space-between; }
.article-footer-links a { padding:11px 19px; color:#fff; font-weight:900; text-decoration:none; background:linear-gradient(135deg,var(--deep-navy),var(--teal)); border:1px solid var(--gold); border-radius:2px 14px 2px 14px; }

/* Image generation process article diagrams */
.creation-flow { display:grid; gap:8px; max-width:620px; margin:28px auto 0; }
.creation-flow div { display:grid; grid-template-columns:42px 1fr; gap:13px; align-items:center; padding:14px 18px; color:#153f61; background:linear-gradient(135deg,#fff,#eef9f9); border:1px solid #cfe3e2; border-radius:3px 15px 3px 15px; box-shadow:0 8px 18px rgba(8,47,103,.06); }
.creation-flow div span { display:grid; place-items:center; width:34px; height:34px; color:#fff; font-weight:900; background:linear-gradient(135deg,#082f67,#178b93); border:1px solid #c99b37; border-radius:50%; }
.creation-flow i { color:#c99b37; font-size:1.35rem; font-style:normal; text-align:center; line-height:1; }
.creation-flow .creation-flow__finish { color:#fff; background:linear-gradient(135deg,#1e704b,#3da66b); border-color:#c99b37; }
.creation-flow__finish span { color:#1e704b !important; background:#fff !important; }

.criteria-list,.review-checklist { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; margin:18px 0 0; padding:0; list-style:none; }
.criteria-list li,.review-checklist li { position:relative; padding:12px 14px 12px 41px; background:#fff; border:1px solid #d7e8e6; border-radius:3px 12px 3px 12px; }
.criteria-list li::before,.review-checklist li::before { content:"✓"; position:absolute; left:12px; top:12px; display:grid; place-items:center; width:20px; height:20px; color:#fff; font-size:.72rem; font-weight:900; background:#178b93; border-radius:50%; }
.pro-check-box,.experience-box { margin-top:22px; padding:20px 23px; background:linear-gradient(135deg,#fff8e8,#eef9f7); border:1px solid #d8c17f; border-radius:3px 15px 3px 15px; }
.pro-check-box strong,.experience-box strong { color:#082f67; }
.pro-check-box p,.experience-box p { margin:7px 0 0; }

.color-palette { display:grid; grid-template-columns:repeat(6,minmax(0,1fr)); gap:9px; margin:22px 0; }
.color-palette span { display:grid; place-items:end center; min-height:90px; padding:9px 5px; color:#193b55; font-size:.78rem; font-weight:900; border:1px solid rgba(8,47,103,.14); border-radius:3px 12px 3px 12px; }
.color-palette__white{background:#fff}.color-palette__beige{background:#eee2cd}.color-palette__wood{background:#c69a6b}.color-palette__blue{background:#cfeaf5}.color-palette__green{background:#cfe7d4}.color-palette__gold{background:linear-gradient(135deg,#fff8dd,#d4a641)}
.mood-notes { display:grid; grid-template-columns:1fr 1fr; gap:13px; margin:20px 0; }
.mood-notes div { padding:18px; background:#fff; border:1px solid #dbe8e9; border-radius:3px 14px 3px 14px; }
.mood-notes strong { color:#082f67; }
.mood-notes p { margin:7px 0 0; }

.element-columns,.comparison-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-top:24px; }
.comparison-visual { max-width:760px; margin:24px auto 28px; padding:7px; background:#fff; border:1px solid #d8c17f; border-radius:4px 18px 4px 18px; box-shadow:0 13px 30px rgba(8,47,103,.10); }
.comparison-visual img { display:block; width:100%; height:auto; border-radius:2px 12px 2px 12px; }
.comparison-visual figcaption { padding:10px 12px 4px; color:#65788a; font-size:.86rem; line-height:1.65; text-align:center; }
.element-columns article,.comparison-grid article { padding:24px; background:linear-gradient(145deg,#fff,#f3faf9); border:1px solid #d3e5e2; border-radius:3px 19px 3px 19px; box-shadow:0 10px 24px rgba(8,47,103,.07); }
.element-columns article>span,.comparison-grid article>span,.before-after-grid article>span { display:inline-block; margin-bottom:9px; color:#b17d20; font-size:.74rem; font-weight:900; letter-spacing:.1em; }
.element-columns h3,.comparison-grid h3,.before-after-grid h3,.prompt-example h3 { margin:0 0 14px; color:#082f67; font-family:"Yu Mincho","Hiragino Mincho ProN",serif; }
.element-columns ul,.comparison-grid ul,.before-after-grid ul { margin:0; padding-left:1.2em; }
.element-columns li,.comparison-grid li,.before-after-grid li { margin:7px 0; }

.before-after-grid { display:grid; grid-template-columns:1fr 52px 1fr; gap:12px; align-items:stretch; margin-top:23px; }
.before-after-grid article { padding:25px; border-radius:3px 19px 3px 19px; }
.before-card { background:#f7f7f7; border:1px solid #d9d9d9; }
.after-card { background:linear-gradient(145deg,#fff9e9,#eaf8f3); border:1px solid #c9dba8; }
.before-after-arrow { display:grid; place-items:center; color:#c99b37; font-size:2rem; font-weight:900; }
.prompt-example { margin-top:22px; padding:24px; background:#fafdfc; border-left:3px solid #c99b37; border-radius:0 16px 0 16px; }
.prompt-example:first-of-type { margin-top:0; }
.blueprint-summary { margin:24px 0; padding:24px; background:#f0f9f8; border:1px solid #c8e0dc; border-radius:3px 17px 3px 17px; }
.blueprint-summary strong { color:#082f67; font-family:"Yu Mincho","Hiragino Mincho ProN",serif; font-size:1.2rem; }
.blueprint-summary ol { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:9px; margin:17px 0 0; padding:0; list-style-position:inside; }
.blueprint-summary li { padding:11px; background:#fff; border:1px solid #d7e8e5; border-radius:3px 11px 3px 11px; font-weight:800; }

@media(max-width:700px){
  .criteria-list,.review-checklist,.element-columns,.comparison-grid,.mood-notes,.blueprint-summary ol{grid-template-columns:1fr}
  .color-palette{grid-template-columns:repeat(3,minmax(0,1fr))}
  .before-after-grid{grid-template-columns:1fr}
  .before-after-arrow{transform:rotate(90deg)}
  .comparison-visual{margin:19px auto 23px;padding:4px}
}

@media (max-width: 920px) {
  .archive-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .article-hero { grid-template-columns: 1fr; max-width: 850px; }
  .article-hero__image { max-width: 720px; }
}

@media (max-width: 640px) {
  .article-feature-link { grid-template-columns:1fr; gap:9px; }
  .content-main,.article-layout { width:min(100% - 24px,1080px); padding-top:38px; }
  .archive-grid { grid-template-columns:1fr; }
  .blog-category-intro { padding: 24px 20px; border-radius: 22px 6px 22px 6px; }
  .archive-card--featured a,
  .archive-card--process a,
  .tool-guide-grid,
  .coming-category-grid { grid-template-columns: 1fr; }
  .archive-card--process a { min-height: auto; }
  .archive-card--featured img,
  .archive-card--process img {
    width: 100%;
    height: auto;
    min-height: auto;
    aspect-ratio: 16/9;
    object-fit: contain;
    object-position: center;
    border-right: 0;
    border-bottom: 1px solid var(--gold-light);
  }
  .archive-card--featured .archive-card__body,
  .archive-card--process .archive-card__body { padding: 24px; }
  .tool-guide-card a { grid-template-columns: 1fr; }
  .tool-guide-card strong { grid-column: auto; }
  .blog-category--coming { padding: 20px; }
  .content-hero { padding:62px 18px 55px; }
  .article-hero { padding:48px 18px 38px; }
  .article-hero__copy h1 br { display:none; }
  .article-lead,.article-toc,.blog-section { padding:27px 20px; }
  .blog-subsection { padding:22px 18px; }
  .article-footer-links { flex-direction:column; }
  .article-footer-links a { text-align:center; }
}

.archive-card--top-image-process img {
  object-fit: cover;
  object-position: center;
}

.archive-card--chatgpt-plus-image-guide img {
  object-fit: cover;
  object-position: center;
}

.archive-card--chatgpt-beginner-screen-guide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

@media (min-width: 641px) {
  .archive-card--ai-learning-business-beginner a,
  .archive-card--hp-blog-learning-record a {
    height: 343px;
    min-height: 310px;
  }

  .archive-card--ai-learning-business-beginner img,
  .archive-card--hp-blog-learning-record img {
    height: 100%;
    min-height: 0;
    aspect-ratio: auto;
  }
}

.archive-card--ai-learning-business-beginner img,
.archive-card--hp-blog-learning-record img,
.archive-card--ai-blog-safety-management img,
.archive-card--ai-blog-creative-progress img,
.archive-card--excel-learning-record img {
  object-fit: cover;
  object-position: center;
}

.archive-card--codex-beginner-steps img,
.archive-card--codex-instruction-thinking img {
  object-fit: cover;
  object-position: center;
}

.archive-card--hp-overall-design img,
.archive-card--hp-beginner-overall-design img,
.archive-card--top-page-design-steps img,
.archive-card--blog-page-expansion-steps img {
  object-fit: cover;
  object-position: center;
}

/* =========================================================
   Main page: elegant AI / navy, teal and gold art-deco theme
   ========================================================= */

.home-page--gold {
  --gold: #c99b37;
  --gold-light: #ead9a2;
  --deep-navy: #082f67;
  --teal: #178b93;
  --ivory: #fffdf8;
  --ink: #26394e;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, rgba(83, 190, 218, .16), transparent 24%),
    radial-gradient(circle at 91% 23%, rgba(201, 155, 55, .13), transparent 25%),
    linear-gradient(rgba(18, 115, 151, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 115, 151, .035) 1px, transparent 1px),
    linear-gradient(155deg, #f5fbff 0%, #fffdf8 42%, #f4faf8 76%, #fffaf0 100%);
  background-size: auto, auto, 38px 38px, 38px 38px, auto;
}

.home-page--gold .ambient-dots {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .62;
}

.home-page--gold .hero-particles {
  position: absolute;
  inset: 10px;
  z-index: 3;
  width: calc(100% - 20px);
  height: calc(100% - 20px);
  pointer-events: none;
  mix-blend-mode: screen;
}

.home-page--gold .site-nav,
.home-page--gold .hero,
.home-page--gold .article,
.home-page--gold .to-top {
  position: relative;
  z-index: 1;
}

.home-page--gold .site-nav { position: sticky; }
.home-page--gold .to-top { position: fixed; }

.home-page--gold .site-nav {
  padding-top: 14px;
  padding-bottom: 14px;
  background: rgba(255, 253, 248, .94);
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid rgba(201, 155, 55, .55);
  box-shadow: 0 8px 28px rgba(8, 47, 103, .08);
}

.home-page--gold .site-nav__brand {
  position: relative;
  padding: 2px 30px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: .08em;
}

.home-page--gold .site-nav__brand::before,
.home-page--gold .site-nav__brand::after {
  content: "◆";
  position: absolute;
  top: 50%;
  color: var(--gold);
  font-size: .65rem;
  transform: translateY(-50%) rotate(45deg);
}

.home-page--gold .site-nav__brand::before { left: 7px; }
.home-page--gold .site-nav__brand::after { right: 7px; }

.home-page--gold .site-nav__links a {
  position: relative;
  padding: 7px 15px;
  color: var(--deep-navy);
  background: #fff;
  border: 1px solid var(--gold-light);
  border-radius: 4px 15px 4px 15px;
  box-shadow: inset 0 -2px 0 rgba(201, 155, 55, .12);
}

.home-page--gold .site-nav__links a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border-color: var(--gold);
}

.home-page--gold .hero {
  padding: 48px 22px 78px;
  background:
    radial-gradient(circle at 16% 75%, rgba(89, 190, 220, .17) 0 2px, transparent 3px) 0 0 / 42px 42px,
    radial-gradient(circle at 86% 22%, rgba(201, 155, 55, .14), transparent 27%),
    linear-gradient(135deg, #f7fcff 0%, #fffdf8 54%, #f2f8f5 100%);
}

.home-page--gold .hero::before,
.home-page--gold .hero::after {
  content: "";
  position: absolute;
  z-index: 1;
  width: 145px;
  height: 145px;
  border: 1px solid rgba(201, 155, 55, .66);
  pointer-events: none;
}

.home-page--gold .hero::before {
  left: 22px;
  top: 23px;
  border-right: 0;
  border-bottom: 0;
  border-radius: 28px 0 0 0;
}

.home-page--gold .hero::after {
  right: 22px;
  bottom: 27px;
  border-left: 0;
  border-top: 0;
  border-radius: 0 0 28px 0;
}

.home-page--gold .hero__decor--one {
  left: -110px;
  top: auto;
  bottom: -95px;
  width: 330px;
  height: 210px;
  background: repeating-radial-gradient(ellipse at center, transparent 0 13px, rgba(64, 170, 205, .18) 14px 15px);
  border-radius: 50%;
}

.home-page--gold .hero__decor--two {
  right: -90px;
  bottom: -80px;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(201, 155, 55, .18), transparent 67%);
}

.home-page--gold .hero__inner--image {
  position: relative;
  padding: 10px;
  background: rgba(255,255,255,.76);
  border: 1px solid var(--gold);
  box-shadow: 0 26px 70px rgba(8, 47, 103, .16);
}

.home-page--gold .hero__inner--image::before,
.home-page--gold .hero__inner--image::after {
  content: "✦";
  position: absolute;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: var(--gold);
  background: var(--ivory);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.home-page--gold .hero__inner--image::before { left: -16px; top: -16px; }
.home-page--gold .hero__inner--image::after { right: -16px; bottom: -16px; }

.home-page--gold .hero__main-image {
  border: 1px solid rgba(201, 155, 55, .7);
  border-radius: 0;
  box-shadow: none;
}

.home-page--gold .article {
  max-width: 960px;
  padding-top: 74px;
}

.home-page--gold .article-section,
.home-page--gold .link-section,
.home-page--gold .points {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-bottom: 54px;
  padding: 48px 44px;
  background:
    linear-gradient(135deg, rgba(255,255,255,.98), rgba(252,252,247,.94));
  border: 1px solid rgba(201, 155, 55, .72);
  border-radius: 3px 32px 3px 32px;
  box-shadow: 0 18px 48px rgba(8, 47, 103, .10);
}

.home-page--gold .article-section::before,
.home-page--gold .link-section::before,
.home-page--gold .points::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -75px;
  top: -75px;
  width: 180px;
  height: 180px;
  background:
    repeating-radial-gradient(circle, transparent 0 11px, rgba(23, 139, 147, .08) 12px 13px);
  border-radius: 50%;
}

.home-page--gold .article-section::after,
.home-page--gold .link-section::after,
.home-page--gold .points::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.home-page--gold .article-section h2,
.home-page--gold .section-heading h2,
.home-page--gold .points h2 {
  position: relative;
  width: fit-content;
  margin: 0 auto 30px;
  padding: 0 72px 18px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  text-align: center;
  letter-spacing: .055em;
}

.home-page--gold .article-section h2::before,
.home-page--gold .section-heading h2::before,
.home-page--gold .points h2::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold) 17%, var(--gold) 83%, transparent);
}

.home-page--gold .article-section h2::after,
.home-page--gold .section-heading h2::after,
.home-page--gold .points h2::after {
  content: "✦";
  position: absolute;
  left: 50%;
  bottom: -7px;
  padding: 0 9px;
  color: var(--gold);
  font-family: serif;
  font-size: 1rem;
  background: var(--ivory);
  transform: translateX(-50%);
}

.home-page--gold .intro-section {
  border-top: 4px double var(--gold);
}

.home-page--gold .intro-section > h2:first-child {
  max-width: 100%;
  white-space: nowrap;
  font-size: clamp(1.4rem, 3vw, 1.95rem);
  letter-spacing: normal;
}

.home-page--gold .intro-section > p:first-of-type::first-letter {
  float: left;
  margin: 8px 10px 0 0;
  color: var(--teal);
  font-family: "Yu Mincho", serif;
  font-size: 3.2rem;
  line-height: .72;
}

.home-page--gold .goal-box {
  position: relative;
  margin: 30px 0;
  padding: 28px;
  background: linear-gradient(135deg, #f3fbfc, #fffaf0);
  border: 1px solid var(--gold-light);
  border-radius: 2px 22px 2px 22px;
  box-shadow: inset 0 0 0 6px rgba(255,255,255,.65);
}

.home-page--gold .goal-box::after {
  content: "◇";
  position: absolute;
  right: 18px;
  top: 13px;
  color: var(--gold);
  font-size: 1.4rem;
}

.home-page--gold .goal-box span {
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
  border-radius: 2px 12px 2px 12px;
}

.home-page--gold .goal-box strong { color: var(--deep-navy); }

.home-page--gold .tool-list {
  gap: 17px;
}

.home-page--gold .tool-list li {
  position: relative;
  min-height: 72px;
  padding: 15px 18px 15px 62px;
  color: var(--deep-navy);
  background: linear-gradient(135deg, #fff, #f3fbfc);
  border: 1px solid rgba(23, 139, 147, .28);
  border-left: 3px solid var(--gold);
  border-radius: 2px 18px 2px 18px;
  box-shadow: 0 10px 24px rgba(8,47,103,.07);
}

.home-page--gold .tool-list li::before {
  content: "✓";
  position: absolute;
  left: 18px;
  margin: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--teal), #42b2ae);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 6px rgba(23,139,147,.08);
}

.home-page--gold .section-heading > p {
  color: var(--teal);
  letter-spacing: .12em;
}

.home-page--gold .page-links {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.home-page--gold .page-link-card,
.home-page--gold .page-link-card--orange,
.home-page--gold .page-link-card--green {
  position: relative;
  overflow: hidden;
  min-height: 310px;
  background: linear-gradient(155deg, #fff 0%, #f6fbfc 72%, #fff8ea 100%);
  border: 1px solid var(--gold-light);
  border-radius: 3px 24px 3px 24px;
  box-shadow: 0 14px 32px rgba(8,47,103,.10);
}

.home-page--gold .page-link-card::before {
  content: "";
  position: absolute;
  right: -35px;
  bottom: -35px;
  width: 110px;
  height: 110px;
  border: 18px double rgba(23,139,147,.13);
  border-radius: 50%;
}

.home-page--gold .page-link-card::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: 11px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.home-page--gold .page-link-card > * { position: relative; z-index: 1; }

.home-page--gold .page-link-card__icon,
.home-page--gold .page-link-card--orange .page-link-card__icon,
.home-page--gold .page-link-card--green .page-link-card__icon {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 0 7px rgba(201,155,55,.09);
}

.home-page--gold .page-link-card strong {
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
}

.home-page--gold .page-link-card__button {
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
  border-radius: 2px 14px 2px 14px;
}

.home-page--gold .points__grid { gap: 16px; }

.home-page--gold .point-box {
  position: relative;
  min-height: 150px;
  padding-top: 25px;
  background: linear-gradient(160deg, #fff, #f2faf9);
  border: 1px solid var(--gold-light);
  border-radius: 2px 18px 2px 18px;
  box-shadow: 0 10px 24px rgba(8,47,103,.07);
}

.home-page--gold .point-box::after {
  content: "";
  position: absolute;
  left: 20%;
  right: 20%;
  bottom: 11px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.home-page--gold .point-box span,
.home-page--gold .point-box:nth-child(even) span {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 6px rgba(201,155,55,.09);
}

.home-page--gold .to-top {
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
}

@media (max-width: 920px) {
  .home-page--gold .page-links { grid-template-columns: 1fr; }
  .home-page--gold .page-link-card { min-height: 250px; }
}

@media (max-width: 640px) {
  .home-page--gold .hero { padding: 28px 12px 48px; }
  .home-page--gold .hero__inner--image { padding: 5px; }
  .home-page--gold .hero-particles {
    inset: 5px;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
  }
  .home-page--gold .hero__inner--image::before,
  .home-page--gold .hero__inner--image::after { display: none; }
  .home-page--gold .article-section,
  .home-page--gold .link-section,
  .home-page--gold .points { padding: 30px 20px; }
  .home-page--gold .article-section h2,
  .home-page--gold .section-heading h2,
  .home-page--gold .points h2 { padding-right: 18px; padding-left: 18px; }
  .home-page--gold .intro-section > h2:first-child {
    white-space: normal;
    font-size: clamp(1.35rem, 6vw, 1.8rem);
  }
}

/* =========================================================
   Unified site design: match lower pages to index.html
   ========================================================= */

body.content-page {
  --gold: #c99b37;
  --gold-light: #ead9a2;
  --deep-navy: #082f67;
  --teal: #178b93;
  --ivory: #fffdf8;
  --ink: #26394e;
  --blue: var(--teal);
  --green: var(--teal);
  --orange: var(--gold);
  --navy: var(--deep-navy);
  --text: var(--ink);
  --muted: #64768a;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, rgba(83, 190, 218, .16), transparent 24%),
    radial-gradient(circle at 91% 23%, rgba(201, 155, 55, .13), transparent 25%),
    linear-gradient(rgba(18, 115, 151, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 115, 151, .035) 1px, transparent 1px),
    linear-gradient(155deg, #f5fbff 0%, #fffdf8 42%, #f4faf8 76%, #fffaf0 100%);
  background-size: auto, auto, 38px 38px, 38px 38px, auto;
  overflow-x: hidden;
}

body.content-page .site-nav,
.home-page--gold .site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: 14px;
  padding-bottom: 14px;
  background: rgba(255, 253, 248, .94);
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid rgba(201, 155, 55, .55);
  box-shadow: 0 8px 28px rgba(8, 47, 103, .08);
  backdrop-filter: blur(10px);
}

body.content-page .site-nav__brand,
.home-page--gold .site-nav__brand {
  position: relative;
  padding: 2px 30px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 900;
  letter-spacing: .08em;
  text-decoration: none;
}

body.content-page .site-nav__brand::before,
body.content-page .site-nav__brand::after,
.home-page--gold .site-nav__brand::before,
.home-page--gold .site-nav__brand::after {
  content: "◆";
  position: absolute;
  top: 50%;
  color: var(--gold);
  font-size: .65rem;
  transform: translateY(-50%) rotate(45deg);
}

body.content-page .site-nav__brand::before,
.home-page--gold .site-nav__brand::before { left: 7px; }

body.content-page .site-nav__brand::after,
.home-page--gold .site-nav__brand::after { right: 7px; }

body.content-page .site-nav__links,
.home-page--gold .site-nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

body.content-page .site-nav__links a,
.home-page--gold .site-nav__links a {
  position: relative;
  padding: 7px 15px;
  color: var(--deep-navy);
  font-size: .92rem;
  font-weight: 800;
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--gold-light);
  border-radius: 4px 15px 4px 15px;
  box-shadow: inset 0 -2px 0 rgba(201, 155, 55, .12);
}

body.content-page .site-nav__links a:hover,
.home-page--gold .site-nav__links a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border-color: var(--gold);
}

body.content-page .sub-hero,
body.content-page .content-hero {
  position: relative;
  overflow: hidden;
  padding: 72px 22px 64px;
  text-align: center;
  background:
    radial-gradient(circle at 16% 75%, rgba(89, 190, 220, .17) 0 2px, transparent 3px) 0 0 / 42px 42px,
    radial-gradient(circle at 86% 22%, rgba(201, 155, 55, .14), transparent 27%),
    linear-gradient(135deg, #f7fcff 0%, #fffdf8 54%, #f2f8f5 100%);
  border-bottom: 1px solid var(--gold-light);
}

body.content-page .sub-hero::before,
body.content-page .sub-hero::after,
body.content-page .content-hero::before,
body.content-page .content-hero::after {
  content: "";
  position: absolute;
  z-index: 1;
  width: 145px;
  height: 145px;
  border: 1px solid rgba(201, 155, 55, .66);
  pointer-events: none;
}

body.content-page .sub-hero::before,
body.content-page .content-hero::before {
  left: 22px;
  top: 23px;
  border-right: 0;
  border-bottom: 0;
  border-radius: 28px 0 0 0;
}

body.content-page .sub-hero::after,
body.content-page .content-hero::after {
  right: 22px;
  bottom: 27px;
  border-left: 0;
  border-top: 0;
  border-radius: 0 0 28px 0;
}

body.content-page .sub-hero__inner,
body.content-page .content-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
}

body.content-page .sub-hero h1,
body.content-page .content-hero h1 {
  margin: 0 0 16px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.25;
  letter-spacing: .035em;
}

body.content-page .sub-hero h1.obs-trouble-title {
  font-size: clamp(1.75rem, 3.2vw, 2.75rem);
  letter-spacing: 0;
  white-space: nowrap;
  word-break: keep-all;
  overflow-wrap: normal;
}

body.content-page .sub-hero p:last-child,
body.content-page .content-hero p:last-child {
  max-width: 720px;
  margin: 0 auto;
  color: var(--ink);
  font-size: 1.08rem;
}

body.content-page .hero__eyebrow,
body.content-page .content-hero__eyebrow,
body.content-page .article-hero__category {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  padding: 6px 16px;
  color: var(--teal);
  font-size: .84rem;
  font-weight: 900;
  letter-spacing: .12em;
  background: #e9f8ee;
  border: 1px solid #c8ead5;
  border-radius: 999px;
}

body.content-page .article,
body.content-page .content-main,
body.content-page .article-layout {
  max-width: 960px;
  margin: 0 auto;
  padding-top: 74px;
}

body.content-page .article-section,
body.content-page .steps-section,
body.content-page .points,
body.content-page .link-section,
body.content-page .plus-introduction,
body.content-page .article-lead,
body.content-page .article-toc,
body.content-page .blog-section,
body.content-page .blog-category-intro,
body.content-page .archive-card,
body.content-page .tool-guide-card a,
body.content-page .coming-category-card,
body.content-page .plus-guide-card,
body.content-page .plus-step-detail,
body.content-page .step-card {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255,255,255,.98), rgba(252,252,247,.94));
  border: 1px solid rgba(201, 155, 55, .72);
  border-radius: 3px 32px 3px 32px;
  box-shadow: 0 18px 48px rgba(8, 47, 103, .10);
}

body.content-page .article-section::before,
body.content-page .steps-section::before,
body.content-page .points::before,
body.content-page .link-section::before,
body.content-page .plus-introduction::before,
body.content-page .blog-section::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -75px;
  top: -75px;
  width: 180px;
  height: 180px;
  background: repeating-radial-gradient(circle, transparent 0 11px, rgba(23, 139, 147, .08) 12px 13px);
  border-radius: 50%;
}

body.content-page .article-section h2,
body.content-page .section-heading h2,
body.content-page .points h2,
body.content-page .blog-section > h2,
body.content-page .blog-category-intro h2,
body.content-page .blog-category__heading h2 {
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: .035em;
}

body.content-page .goal-box,
body.content-page .message-box,
body.content-page .plus-example-box,
body.content-page .step-caution,
body.content-page .article-summary,
body.content-page .pro-check-box,
body.content-page .experience-box,
body.content-page .blueprint-summary {
  background: linear-gradient(135deg, #f3fbfc, #fffaf0);
  border: 1px solid var(--gold-light);
  border-radius: 2px 22px 2px 22px;
  box-shadow: inset 0 0 0 6px rgba(255,255,255,.65);
}

body.content-page .page-catch-image {
  margin-top: 48px;
  padding: 10px;
  background: rgba(255,255,255,.76);
  border: 1px solid var(--gold);
  border-radius: 0;
  box-shadow: 0 26px 70px rgba(8, 47, 103, .16);
}

body.content-page .page-catch-image img {
  border: 1px solid rgba(201, 155, 55, .7);
  border-radius: 0;
  box-shadow: none;
}

body.content-page .next-links a,
body.content-page .article-footer-links a,
body.content-page .page-link-card__button {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border: 1px solid var(--gold);
  border-radius: 2px 14px 2px 14px;
}

body.chatgpt-page .page-catch-image {
  width: min(760px, 100%);
  margin: 0 auto 42px;
}

body.chatgpt-page .article {
  padding-top: 58px;
}

body.chatgpt-page .plus-introduction,
body.chatgpt-page .steps-section,
body.chatgpt-page .next-links {
  width: 100%;
}

body.chatgpt-page .plus-usage-guide,
body.chatgpt-page .plus-usage-card,
body.chatgpt-page .usage-description,
body.chatgpt-page .usage-tip,
body.chatgpt-page .usage-operation,
body.chatgpt-page .usage-prompt,
body.chatgpt-page .usage-followup,
body.chatgpt-page .usage-theme-item,
body.chatgpt-page .usage-input-compare > div {
  border-radius: 3px 18px 3px 18px;
}

body.chatgpt-page .plus-steps-grid .plus-step-card {
  border-top: 0;
  border-left: 3px solid var(--gold);
}

body.chatgpt-page .site-nav__links a[href="chatgpt-plus.html"] {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  border-color: var(--gold);
}

.article-image {
  max-width: 100%;
  margin: 24px auto;
  text-align: center;
}

.article-image img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
  border: 1px solid rgba(201, 155, 55, .55);
  border-radius: 14px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.10);
}

.article-image--medium img {
  max-width: 520px;
}

.article-image--wide img {
  max-width: 560px;
}

.article-image--zoom-cutoff img {
  max-width: 600px;
}

.article-image--plus-offer img {
  max-width: 600px;
}

.article-image--model-thinking img {
  max-width: 600px;
}

.article-image--project-vertical img {
  max-width: 600px;
  height: auto;
  object-fit: contain;
}

.article-image--project-vertical figcaption {
  max-width: 600px;
  margin-right: auto;
  margin-left: auto;
}

.article-image--obs img {
  max-width: 720px;
  border-color: rgba(61, 166, 107, .32);
}

.article-image--narrow img {
  max-width: 420px;
}

.article-image figcaption {
  margin-top: 8px;
  color: #666;
  font-size: .86rem;
  line-height: 1.7;
  text-align: center;
}

.article-table-wrap {
  width: 100%;
  margin: 22px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  background: rgba(255,255,255,.96);
  border: 1px solid var(--gold-light);
  box-shadow: 0 10px 24px rgba(8,47,103,.06);
}

.article-table caption {
  margin-bottom: 10px;
  color: var(--deep-navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 900;
  text-align: left;
}

.article-table th,
.article-table td {
  padding: 12px 14px;
  border: 1px solid #d7e8e5;
  text-align: left;
  vertical-align: top;
}

.article-table th {
  color: #fff;
  background: linear-gradient(135deg, var(--deep-navy), var(--teal));
  font-weight: 900;
  white-space: nowrap;
}

.article-table td:first-child {
  color: var(--deep-navy);
  font-weight: 800;
}

body.content-page .blog-article kbd {
  display: inline-block;
  padding: .15em .45em;
  margin: 0 .1em;
  color: #263846;
  font-family: inherit;
  font-size: .92em;
  line-height: 1.4;
  white-space: nowrap;
  background: #f7f9fb;
  border: 1px solid #c7d2dc;
  border-radius: 6px;
  box-shadow: 0 2px 0 #aebbc6;
}

@media (max-width: 640px) {
  .article-image,
  .article-image--medium img,
  .article-image--wide img,
  .article-image--project-vertical img,
  .article-image--narrow img {
    max-width: 100%;
  }

  body.content-page .site-nav {
    align-items: flex-start;
  }

  body.content-page .site-nav__brand {
    padding-right: 26px;
    padding-left: 26px;
  }

  body.content-page .sub-hero,
  body.content-page .content-hero {
    padding: 54px 18px 46px;
  }

  body.content-page .sub-hero::before,
  body.content-page .sub-hero::after,
  body.content-page .content-hero::before,
  body.content-page .content-hero::after {
    display: none;
  }

  body.content-page .sub-hero h1.obs-trouble-title {
    white-space: normal;
    text-wrap: balance;
  }
}