:root {
  --ink: #171513;
  --ink-soft: #4d4741;
  --muted: #7d756d;
  --paper: #fbfaf7;
  --paper-warm: #f4eee5;
  --line: #ded5c9;
  --steel: #6f8486;
  --copper: #b95f35;
  --ember: #d9432f;
  --melt: #efb85a;
  --quench: #0f8d83;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(31, 25, 18, 0.14);
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 clamp(14px, 3vw, 34px);
  background: rgba(251, 250, 247, 0.88);
  border-bottom: 1px solid rgba(222, 213, 201, 0.75);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--ink), #524236 48%, var(--copper));
  color: var(--paper);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  box-shadow: 0 10px 26px rgba(36, 25, 15, 0.22);
}

.brand-copy {
  display: grid;
  line-height: 1.1;
}

.brand-copy span {
  font-weight: 800;
  font-size: 13px;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 11px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a.active {
  background: var(--ink);
  color: var(--paper);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
}

.site-nav .language-switch a {
  height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.site-nav .language-switch a:hover {
  background: rgba(23, 21, 19, 0.08);
  color: var(--ink);
}

.site-nav .language-switch a.active {
  background: var(--ink);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

main {
  overflow: hidden;
}

.hero {
  position: relative;
  min-height: 700px;
  display: grid;
  align-items: end;
  padding: 112px clamp(20px, 5vw, 72px) 34px;
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center;
  color: var(--white);
}

.home-hero {
  background-position: center right;
  color: var(--ink);
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 13, 10, 0.92), rgba(17, 13, 10, 0.62) 48%, rgba(17, 13, 10, 0.22)),
    linear-gradient(0deg, rgba(17, 13, 10, 0.82), transparent 44%);
}

.home-hero .hero-shade {
  background:
    linear-gradient(90deg, rgba(251, 250, 247, 0.98), rgba(251, 250, 247, 0.86) 38%, rgba(251, 250, 247, 0.22) 72%, rgba(251, 250, 247, 0.02)),
    linear-gradient(0deg, rgba(251, 250, 247, 0.8), rgba(251, 250, 247, 0.12) 40%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, 100%);
  padding-bottom: clamp(18px, 4vh, 46px);
}

.home-hero .hero-content {
  width: min(620px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--copper);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow,
.page-hero .eyebrow {
  color: var(--melt);
}

.home-hero .eyebrow {
  color: var(--copper);
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

.hero h1 {
  margin: 0;
  font-size: 96px;
  line-height: 0.96;
  letter-spacing: 0;
  font-weight: 900;
}

.home-hero .hero-title {
  width: min(620px, 100%);
  color: #10263c;
  font-size: clamp(72px, 6.1vw, 96px);
  line-height: 0.92;
}

.home-hero .hero-title span {
  display: block;
}

.home-hero .hero-title .accent,
.home-hero .hero-title-zh {
  color: #2f7f89;
}

.home-hero .hero-title::after {
  content: "";
  display: block;
  width: 82px;
  height: 3px;
  margin-top: 28px;
  border-radius: 99px;
  background: #2f7f89;
}

.hero-lead {
  width: min(790px, 100%);
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 20px;
  line-height: 1.85;
}

.hero-actions,
.video-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  font-size: 14px;
  cursor: pointer;
}

.button.primary {
  background: var(--melt);
  color: #22160a;
  box-shadow: 0 12px 28px rgba(239, 184, 90, 0.24);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.11);
  border-color: rgba(255, 255, 255, 0.38);
  color: var(--white);
  backdrop-filter: blur(10px);
}

.button.quiet {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.24);
  color: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
}

.home-hero .hero-lead {
  width: min(560px, 100%);
  color: rgba(23, 21, 19, 0.76);
}

.home-hero .button.primary {
  background: #2f7f89;
  color: var(--white);
  box-shadow: 0 14px 30px rgba(47, 127, 137, 0.22);
}

.home-hero .button.secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(23, 21, 19, 0.22);
  color: var(--ink);
  box-shadow: 0 12px 28px rgba(31, 25, 18, 0.08);
}

.home-hero .button.quiet {
  background: rgba(255, 255, 255, 0.44);
  border-color: rgba(23, 21, 19, 0.16);
  color: var(--ink-soft);
  box-shadow: 0 12px 28px rgba(31, 25, 18, 0.06);
}

.button.compact {
  min-height: 38px;
  padding: 0 13px;
  border-radius: 7px;
}

/* 课程知识库：复用知识库（/notes/）的深链接入口 */
.button.ai {
  background: var(--quench);
  color: var(--white);
  box-shadow: 0 12px 28px rgba(15, 141, 131, 0.24);
}
.site-nav a.nav-ai {
  color: var(--quench);
  border: 1px solid rgba(15, 141, 131, 0.4);
}
.site-nav a.nav-ai:hover {
  background: var(--quench);
  color: var(--white);
  border-color: var(--quench);
}
.site-nav a.nav-ai.active {
  background: var(--quench);
  color: var(--white);
  border-color: var(--quench);
}
.ai-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(26px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(15, 141, 131, 0.06);
}
.ai-card-copy {
  width: min(620px, 100%);
}
.ai-card-copy h2 {
  margin: 6px 0 10px;
  font-size: 34px;
  line-height: 1.14;
}
.ai-card-copy p:not(.eyebrow) {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}
.ai-card-action {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.ai-card-action small {
  color: var(--muted);
  font-size: 12.5px;
}
.assistant-page {
  padding: 84px clamp(16px, 3vw, 40px) 16px;
}

.assistant-page-compact {
  padding: 52px 0 0;
}

.assistant-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}
.assistant-bar-title {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 15px;
  color: var(--ink-soft);
}
.assistant-frame-wrap {
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow);
}

.assistant-page-compact .assistant-frame-wrap {
  height: calc(100vh - 52px);
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.assistant-frame {
  display: block;
  width: 100%;
  height: calc(100vh - 150px);
  min-height: 460px;
  border: 0;
}

.assistant-page-compact .assistant-frame {
  height: calc(100vh - 52px);
  min-height: 0;
}

.assistant-shell .site-footer {
  display: none;
}

.video-card .button.secondary {
  background: var(--white);
  border-color: var(--line);
  color: var(--ink);
}

.hero-metrics {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(1120px, 100%);
  margin: 0;
  background: rgba(255, 255, 255, 0.24);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.hero-metrics div {
  min-height: 86px;
  padding: 16px 18px;
  background: rgba(22, 16, 11, 0.42);
}

.hero-metrics dt {
  color: rgba(255, 255, 255, 0.55);
  font-size: 12px;
}

.hero-metrics dd {
  margin: 8px 0 0;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 850;
}

.home-hero .hero-metrics {
  background: rgba(23, 21, 19, 0.1);
  border-color: rgba(23, 21, 19, 0.12);
}

.home-hero .hero-metrics div {
  background: rgba(255, 255, 255, 0.64);
}

.home-hero .hero-metrics dt {
  color: rgba(23, 21, 19, 0.54);
}

.home-hero .hero-metrics dd {
  color: var(--ink);
}

.band {
  padding: clamp(54px, 8vw, 96px) clamp(20px, 5vw, 72px);
}

.band.first {
  padding-top: 40px;
}

.band.contrast {
  background: var(--paper-warm);
  border-block: 1px solid rgba(222, 213, 201, 0.7);
}

.section-head {
  width: min(780px, 100%);
  margin-bottom: 28px;
}

.section-head.split,
.section-subhead.split {
  width: 100%;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-subhead {
  width: min(840px, 100%);
  margin: 44px 0 20px;
}

.section-subhead h3 {
  margin: 0;
  font-size: 34px;
  line-height: 1.12;
}

.section-subhead p:not(.eyebrow) {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}

.section-head h2,
.page-hero h1,
.two-column h2 {
  margin: 0;
  font-size: 52px;
  line-height: 1.08;
  letter-spacing: 0;
}

.section-head p:not(.eyebrow),
.page-hero p,
.long-text {
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.9;
}

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

.module-card,
.dashboard-panel,
.video-card,
.resource-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.module-card {
  min-height: 310px;
  padding: 26px;
  display: flex;
  flex-direction: column;
}

.module-card > p:first-child {
  margin: 0 0 16px;
  color: var(--quench);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.module-card h3,
.dashboard-panel h3,
.resource-card h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
}

.module-line {
  display: block;
  width: 100%;
  height: 6px;
  margin: 22px 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--steel), var(--melt), var(--ember), var(--quench));
}

.module-card p:last-of-type,
.resource-card p,
.video-copy p {
  color: var(--ink-soft);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.tag-row span {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: #ece3d6;
  color: #6a4b31;
  font-size: 12px;
  font-weight: 700;
}

.dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 18px;
}

.dashboard-panel {
  padding: 28px;
}

.objective-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: item;
}

.objective-list li {
  position: relative;
  min-height: 42px;
  padding-left: 52px;
  margin: 0 0 14px;
  color: var(--ink-soft);
}

.objective-list li::before {
  counter-increment: item;
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--melt);
  font-size: 12px;
  font-weight: 900;
}

.objective-list.wide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
}

.bar-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  margin-top: 20px;
}

.bar-row span {
  color: var(--ink-soft);
  font-weight: 750;
}

.bar-row strong {
  color: var(--copper);
}

.bar-row i {
  grid-column: 1 / -1;
  position: relative;
  display: block;
  height: 10px;
  border-radius: 99px;
  background: #e7ddd0;
  overflow: hidden;
}

.bar-row i::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--value);
  background: linear-gradient(90deg, var(--copper), var(--melt));
}

.text-link {
  color: var(--copper);
  font-weight: 850;
}

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

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

.video-card {
  display: grid;
  grid-template-columns: 124px minmax(0, 1fr);
  overflow: hidden;
}

.video-card.detailed {
  grid-template-columns: 150px minmax(0, 1fr);
}

.video-card.embedded {
  grid-template-columns: 1fr;
  align-content: start;
}

.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  min-height: 260px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 24% 36%, rgba(239, 184, 90, 0.22), transparent 18%),
    radial-gradient(circle at 72% 64%, rgba(15, 141, 131, 0.2), transparent 20%),
    #16120f;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.video-poster {
  min-height: 170px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 36% 42%, rgba(239, 184, 90, 0.88) 0 3px, transparent 4px),
    radial-gradient(circle at 65% 62%, rgba(15, 141, 131, 0.88) 0 4px, transparent 5px),
    radial-gradient(circle at 46% 72%, rgba(217, 67, 47, 0.9) 0 3px, transparent 4px),
    linear-gradient(135deg, #26211d, #665244);
  color: var(--paper);
}

.video-poster span {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.25);
  font-weight: 900;
}

.video-copy {
  padding: 22px;
}

.video-copy h2,
.video-copy h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.25;
}

.video-copy a:not(.button) {
  color: var(--copper);
  font-weight: 850;
}

.video-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.video-meta span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.embed-slot {
  grid-column: 1 / -1;
  display: none;
  height: min(62vw, 520px);
  min-height: 320px;
  border-top: 1px solid var(--line);
  background: #16120f;
}

.embed-slot.open {
  display: block;
}

.embed-slot iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.page-hero {
  min-height: 420px;
  padding: 150px clamp(20px, 5vw, 72px) 64px;
  background:
    linear-gradient(90deg, rgba(251, 250, 247, 0.98), rgba(251, 250, 247, 0.84) 42%, rgba(251, 250, 247, 0.24) 78%),
    linear-gradient(0deg, rgba(251, 250, 247, 0.9), rgba(251, 250, 247, 0.16) 56%, transparent 80%),
    url("../img/mp-hero-page-20260615.webp") center right / cover;
  color: var(--ink);
}

.page-hero p {
  width: min(820px, 100%);
  color: rgba(23, 21, 19, 0.72);
}

.page-hero h1 {
  color: #2f7f89;
}

.info-table {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--white);
}

.info-table div {
  min-height: 108px;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.info-table span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.info-table strong {
  font-size: 18px;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.assessment-large {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.assessment-large div {
  min-height: 150px;
  padding: 28px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
}

.assessment-large strong {
  display: block;
  color: var(--melt);
  font-size: 48px;
  line-height: 1;
}

.assessment-large span {
  display: block;
  margin-top: 14px;
  font-weight: 800;
}

.notice-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 22px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.notice-row span {
  flex: 0 0 auto;
  color: var(--quench);
  font-weight: 900;
}

.notice-row p {
  margin: 0;
  color: var(--ink-soft);
}

.resource-card {
  min-height: 210px;
  padding: 26px;
}

.resource-card > span {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 0 10px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: #e7f3ef;
  color: var(--quench);
  font-size: 12px;
  font-weight: 850;
}

.source-list {
  display: grid;
  gap: 10px;
  width: min(820px, 100%);
}

.source-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.source-list span {
  font-weight: 760;
}

.source-list small {
  color: var(--muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 32px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
}

.site-footer div {
  display: grid;
}

.site-footer strong {
  color: var(--ink);
}

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

.topic-preview-card {
  display: block;
  min-height: 360px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.topic-preview-card:hover {
  transform: translateY(-3px);
  border-color: rgba(185, 95, 53, 0.46);
  box-shadow: 0 28px 80px rgba(31, 25, 18, 0.18);
}

.topic-preview-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #171513;
}

.topic-preview-card p,
.topic-preview-card h3,
.topic-preview-card span {
  margin-left: 20px;
  margin-right: 20px;
}

.topic-preview-card p {
  margin-top: 18px;
  margin-bottom: 8px;
  color: var(--quench);
  font-size: 12px;
  font-weight: 850;
}

.topic-preview-card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 20px;
  line-height: 1.35;
}

.topic-preview-card span {
  display: block;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.home-topic-band {
  background: linear-gradient(180deg, #fbfaf7 0%, #f6f0e8 100%);
}

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

.home-process-block {
  margin-top: 8px;
}

.process-video-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.process-preview-card {
  min-height: 340px;
}

.process-preview-card h3 {
  font-size: 18px;
}

.knowledge-band {
  background:
    linear-gradient(180deg, rgba(244, 238, 229, 0.95), rgba(251, 250, 247, 0.95));
}

.knowledge-workbench {
  display: grid;
  grid-template-columns: minmax(260px, 0.34fr) minmax(0, 0.66fr);
  min-height: 640px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow);
}

.knowledge-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  padding: 34px;
  background:
    linear-gradient(145deg, rgba(15, 141, 131, 0.12), rgba(239, 184, 90, 0.1)),
    var(--paper);
}

.knowledge-copy h3 {
  margin: 0;
  font-size: 32px;
  line-height: 1.16;
}

.knowledge-copy p:not(.eyebrow) {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.85;
}

.knowledge-frame {
  display: block;
  width: 100%;
  height: 640px;
  border: 0;
  background: #fff;
}

.course-intro-band {
  background: var(--paper);
}

.course-brief-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.15fr 0.95fr;
  gap: 18px;
}

.course-brief-panel {
  min-height: 300px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.course-brief-panel h3 {
  margin: 0 0 18px;
  font-size: 24px;
  line-height: 1.2;
}

.mini-route-list {
  display: grid;
  gap: 10px;
}

.mini-route-list div {
  padding: 14px;
  border: 1px solid rgba(222, 213, 201, 0.9);
  border-radius: 8px;
  background: #fffaf3;
}

.mini-route-list span {
  display: block;
  margin-bottom: 4px;
  color: var(--quench);
  font-size: 12px;
  font-weight: 850;
}

.mini-route-list strong {
  font-size: 16px;
}

.objective-list.compact li {
  min-height: 36px;
  margin-bottom: 12px;
  padding-left: 48px;
}

.topic-hero {
  position: relative;
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: end;
  padding: 142px clamp(20px, 5vw, 72px) 56px;
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center;
  color: var(--white);
}

.topic-hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 13, 10, 0.9), rgba(17, 13, 10, 0.56) 54%, rgba(17, 13, 10, 0.28)),
    linear-gradient(0deg, rgba(17, 13, 10, 0.78), transparent 45%);
}

.topic-hero-copy,
.topic-questions {
  position: relative;
  z-index: 1;
}

.topic-hero h1 {
  margin: 0;
  width: min(880px, 100%);
  font-size: 88px;
  line-height: 0.98;
}

.topic-hero-copy > p:not(.eyebrow) {
  width: min(760px, 100%);
  color: rgba(255, 255, 255, 0.84);
  font-size: 20px;
  line-height: 1.9;
}

.topic-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(680px, 100%);
  margin: 30px 0 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px);
}

.topic-stats div {
  padding: 15px 16px;
  background: rgba(22, 16, 11, 0.42);
}

.topic-stats dt {
  color: rgba(255, 255, 255, 0.58);
  font-size: 12px;
}

.topic-stats dd {
  margin: 6px 0 0;
  color: var(--melt);
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
}

.topic-questions {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 360px;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px);
}

.topic-questions h2 {
  margin: 0 0 16px;
  font-size: 24px;
}

.topic-questions ol {
  margin: 0;
  padding-left: 22px;
  color: rgba(255, 255, 255, 0.84);
}

.topic-questions li + li {
  margin-top: 12px;
}

.process-video-hero,
.solid-topic-hero {
  background-position: center right;
  color: var(--ink);
}

.process-video-hero .topic-hero-shade,
.solid-topic-hero .topic-hero-shade {
  background:
    linear-gradient(90deg, rgba(251, 250, 247, 0.98), rgba(251, 250, 247, 0.84) 42%, rgba(251, 250, 247, 0.18) 76%, rgba(251, 250, 247, 0.02)),
    linear-gradient(0deg, rgba(251, 250, 247, 0.86), rgba(251, 250, 247, 0.16) 48%, transparent 74%);
}

.process-video-hero .eyebrow,
.solid-topic-hero .eyebrow {
  color: var(--copper);
}

.process-video-hero h1 {
  width: min(640px, 100%);
  color: #2f7f89;
  font-size: clamp(66px, 6vw, 88px);
}

.solid-topic-hero h1 {
  width: min(760px, 100%);
  color: #2f7f89;
  font-size: clamp(54px, 5vw, 76px);
}

.process-video-hero .topic-hero-copy > p:not(.eyebrow),
.solid-topic-hero .topic-hero-copy > p:not(.eyebrow) {
  width: min(620px, 100%);
  color: rgba(23, 21, 19, 0.76);
}

.process-video-hero .topic-stats,
.solid-topic-hero .topic-stats {
  width: min(620px, 100%);
  background: rgba(23, 21, 19, 0.1);
  border-color: rgba(23, 21, 19, 0.12);
}

.process-video-hero .topic-stats div,
.process-video-hero .topic-questions,
.solid-topic-hero .topic-stats div,
.solid-topic-hero .topic-questions {
  background: rgba(255, 255, 255, 0.66);
}

.process-video-hero .topic-stats dt,
.process-video-hero .topic-questions ol,
.solid-topic-hero .topic-stats dt,
.solid-topic-hero .topic-questions ol {
  color: rgba(23, 21, 19, 0.58);
}

.process-video-hero .topic-stats dd,
.process-video-hero .topic-questions h2,
.solid-topic-hero .topic-stats dd,
.solid-topic-hero .topic-questions h2 {
  color: var(--ink);
}

.process-video-hero .topic-questions,
.solid-topic-hero .topic-questions {
  border-color: rgba(47, 127, 137, 0.22);
  box-shadow: 0 18px 54px rgba(47, 127, 137, 0.12);
}

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

.topic-map-section {
  min-height: 280px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.topic-map-section h3 {
  margin: 0 0 20px;
  font-size: 24px;
  line-height: 1.25;
}

.topic-map-section div {
  display: grid;
  gap: 10px;
}

.topic-map-section a {
  display: block;
  padding: 10px 0;
  border-top: 1px solid rgba(222, 213, 201, 0.8);
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.55;
}

.topic-map-section a:hover {
  color: var(--copper);
}

.case-list {
  display: grid;
  gap: 24px;
}

.study-case {
  display: grid;
  grid-template-columns: minmax(360px, 0.98fr) minmax(0, 1.02fr);
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.case-media {
  display: grid;
  gap: 1px;
  align-content: start;
  background: #171513;
}

.topic-video {
  margin: 0;
  background: #171513;
}

.topic-video video {
  display: block;
  width: 100%;
  max-height: 520px;
  background: #171513;
}

.topic-video figcaption {
  display: grid;
  gap: 4px;
  padding: 14px 16px 16px;
  color: rgba(255, 255, 255, 0.86);
}

.topic-video figcaption strong {
  font-size: 14px;
  line-height: 1.5;
}

.topic-video figcaption span {
  color: rgba(255, 255, 255, 0.54);
  font-size: 12px;
}

.case-copy {
  padding: clamp(24px, 4vw, 38px);
}

.case-number {
  margin: 0 0 12px;
  color: var(--quench);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

.case-copy h3 {
  margin: 0;
  font-size: 34px;
  line-height: 1.18;
}

.case-takeaway {
  margin: 18px 0 22px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.85;
}

.case-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--line);
}

.case-facts div {
  min-height: 90px;
  padding: 14px;
  background: #fffaf3;
}

.case-facts dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.case-facts dd {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
  font-weight: 700;
}

.case-tags {
  margin-top: 0;
  margin-bottom: 20px;
}

.citation-box {
  padding: 16px;
  border-left: 4px solid var(--copper);
  background: var(--paper-warm);
}

.citation-box p {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.citation-box cite {
  display: block;
  color: var(--ink);
  font-style: normal;
  font-weight: 800;
  line-height: 1.6;
}

.citation-box a {
  display: inline-block;
  margin-top: 8px;
  color: var(--copper);
  font-weight: 850;
  word-break: break-word;
}

@media (max-width: 980px) {
  .site-header {
    height: 48px;
  }

  .brand-copy small {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 48px;
    right: 16px;
    display: none;
    min-width: 220px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    justify-content: flex-start;
  }

  .language-switch {
    width: 100%;
    margin-top: 4px;
  }

  .site-nav .language-switch a {
    flex: 1;
    justify-content: center;
  }

  .assistant-page-compact {
    padding-top: 48px;
  }

  .assistant-page-compact .assistant-frame-wrap,
  .assistant-page-compact .assistant-frame {
    height: calc(100vh - 48px);
  }

  .hero {
    min-height: 660px;
    padding-top: 120px;
  }

  .hero h1 {
    font-size: 74px;
  }

  .home-hero .hero-title {
    font-size: 70px;
  }

  .hero-lead {
    font-size: 18px;
  }

  .ai-card-copy h2 {
    font-size: 30px;
  }

  .hero-metrics dd {
    font-size: 21px;
  }

  .section-head h2,
  .page-hero h1,
  .two-column h2 {
    font-size: 44px;
  }

  .module-grid,
  .video-grid,
  .video-grid.compact,
  .topic-preview-grid,
  .topic-map,
  .study-case,
  .knowledge-workbench,
  .course-brief-grid,
  .resource-grid,
  .dashboard,
  .two-column,
  .info-table,
  .assessment-large,
  .objective-list.wide {
    grid-template-columns: 1fr;
  }

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

  .section-head.split {
    align-items: start;
    flex-direction: column;
  }

  .section-subhead.split {
    align-items: start;
    flex-direction: column;
  }

  .topic-hero {
    grid-template-columns: 1fr;
    min-height: 760px;
    padding-top: 118px;
  }

  .topic-hero h1 {
    font-size: 64px;
  }

  .topic-hero-copy > p:not(.eyebrow) {
    font-size: 18px;
  }

  .topic-questions {
    min-height: auto;
  }

  .knowledge-workbench {
    min-height: 0;
  }

  .knowledge-frame {
    height: 620px;
  }

  .case-copy h3 {
    font-size: 30px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: 12px;
  }

  .brand-copy span {
    font-size: 13px;
  }

  .hero {
    min-height: 640px;
    padding-inline: 18px;
    padding-top: 96px;
  }

  .home-hero {
    background-position: 68% center;
  }

  .home-hero .hero-shade {
    background:
      linear-gradient(90deg, rgba(251, 250, 247, 0.98), rgba(251, 250, 247, 0.9) 52%, rgba(251, 250, 247, 0.34)),
      linear-gradient(0deg, rgba(251, 250, 247, 0.9), rgba(251, 250, 247, 0.32) 48%, transparent);
  }

  .hero h1 {
    font-size: 52px;
  }

  .home-hero .hero-title {
    font-size: 52px;
    line-height: 0.96;
  }

  .home-hero .hero-title::after {
    width: 58px;
    height: 2px;
    margin-top: 18px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .ai-card-copy h2 {
    font-size: 28px;
  }

  .hero-metrics dd {
    font-size: 18px;
  }

  .section-head h2,
  .page-hero h1,
  .two-column h2 {
    font-size: 34px;
  }

  .hero-actions,
  .video-actions,
  .notice-row,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .band {
    padding-inline: 18px;
  }

  .module-card,
  .dashboard-panel,
  .resource-card,
  .video-copy {
    padding: 20px;
  }

  .video-card,
  .video-card.detailed,
  .video-card.embedded {
    grid-template-columns: 1fr;
  }

  .video-poster {
    min-height: 120px;
  }

  .page-hero {
    min-height: 380px;
    padding: 120px 18px 52px;
  }

  .topic-hero {
    min-height: 820px;
    padding: 112px 18px 38px;
  }

  .process-video-hero,
  .solid-topic-hero {
    background-position: 68% center;
  }

  .process-video-hero .topic-hero-shade,
  .solid-topic-hero .topic-hero-shade {
    background:
      linear-gradient(90deg, rgba(251, 250, 247, 0.98), rgba(251, 250, 247, 0.9) 54%, rgba(251, 250, 247, 0.34)),
      linear-gradient(0deg, rgba(251, 250, 247, 0.9), rgba(251, 250, 247, 0.3) 50%, transparent);
  }

  .topic-hero h1 {
    font-size: 46px;
  }

  .solid-topic-hero h1 {
    font-size: 42px;
    line-height: 1.04;
  }

  .topic-hero-copy > p:not(.eyebrow) {
    font-size: 16px;
  }

  .case-copy h3 {
    font-size: 26px;
  }

  .topic-stats,
  .case-facts {
    grid-template-columns: 1fr;
  }

  .topic-questions,
  .topic-map-section,
  .knowledge-copy,
  .case-copy {
    padding: 20px;
  }

  .knowledge-copy h3 {
    font-size: 26px;
  }

  .knowledge-frame {
    height: 560px;
  }

  .info-table div {
    min-height: auto;
  }

  .embed-slot {
    min-height: 240px;
  }

  .video-frame {
    min-height: 220px;
  }
}