:root {
  --brand: #2F7D6D;
  --brand-deep: #245f54;
  --pink: #E88AAE;
  --ink: #1F2A2E;
  --text: #2A3133;
  --muted: #6F787A;
  --orange: #F29A3F;
  --bg: #FAFBF8;
  --surface: #F2F5F1;
  --card: #FFFFFF;
  --line: #DCE4DD;
  --line-dark: #C7D3CB;
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-soft: 0 20px 60px rgba(31, 42, 46, .08);
  --shadow-card: 0 12px 36px rgba(31, 42, 46, .07);
  --shell: min(1180px, calc(100vw - 40px));
  --reading: 760px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body.no-scroll { overflow: hidden; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand); }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
button { color: inherit; }
::selection { background: rgba(47,125,109,.18); }

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  left: 20px;
  top: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }
.shell { width: var(--shell); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid rgba(220,228,221,.85);
  background: rgba(250,251,248,.93);
  backdrop-filter: blur(18px);
}
.header-row {
  min-height: 78px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand img { width: 48px; height: 48px; object-fit: contain; border-radius: 14px; }
.brand__text { display: grid; line-height: 1.15; }
.brand__text strong { font-size: 18px; letter-spacing: .02em; color: var(--ink); }
.brand__text small { margin-top: 5px; font-size: 11px; color: var(--muted); }
.desktop-nav { display: flex; align-items: center; gap: 5px; margin-left: auto; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 650;
  color: #455052;
  transition: background .2s ease, color .2s ease;
}
.nav-link:hover { background: #eef3ef; color: var(--brand-deep); }
.nav-link.is-active { background: #e5efeb; color: var(--brand-deep); }
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 5px;
  height: 2px;
  border-radius: 99px;
  background: var(--orange);
}
.header-actions { display: flex; gap: 8px; }
.icon-button, .menu-button {
  border: 0;
  background: transparent;
  cursor: pointer;
  border-radius: 12px;
}
.icon-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 42px;
  padding: 0 12px;
  background: var(--surface);
}
.icon-button:hover, .menu-button:hover { background: #e6ece7; }
.button-label { font-size: 13px; font-weight: 650; }
.menu-button { display: none; width: 42px; height: 42px; place-items: center; }
.menu-lines, .menu-lines::before, .menu-lines::after {
  display: block;
  width: 19px;
  height: 2px;
  border-radius: 20px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}
.menu-lines { position: relative; }
.menu-lines::before, .menu-lines::after { content: ""; position: absolute; left: 0; }
.menu-lines::before { top: -6px; }
.menu-lines::after { top: 6px; }
.menu-button[aria-expanded="true"] .menu-lines { background: transparent; }
.menu-button[aria-expanded="true"] .menu-lines::before { transform: translateY(6px) rotate(45deg); }
.menu-button[aria-expanded="true"] .menu-lines::after { transform: translateY(-6px) rotate(-45deg); }
.mobile-panel { border-top: 1px solid var(--line); background: var(--bg); }
.mobile-panel__inner { display: grid; padding-block: 10px 18px; }
.mobile-panel__inner a { padding: 12px 2px; border-bottom: 1px solid var(--line); font-weight: 700; }
.mobile-panel__inner a:last-child { border-bottom: 0; }

.search-dialog { position: fixed; inset: 0; z-index: 100; }
.search-dialog__backdrop { position: absolute; inset: 0; background: rgba(31,42,46,.42); backdrop-filter: blur(8px); }
.search-dialog__panel {
  position: relative;
  width: min(700px, calc(100vw - 32px));
  margin: 12vh auto 0;
  border-radius: 26px;
  background: #fff;
  box-shadow: 0 40px 120px rgba(0,0,0,.18);
  padding: 28px;
}
.search-dialog__head { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.search-dialog__head h2 { margin: 0; color: var(--ink); font-size: 24px; }
.search-form { margin-top: 22px; }
.search-form label, .search-page__form label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 700; color: var(--muted); }
.search-form__row, .search-page__form > div { display: flex; gap: 10px; }
.search-form input, .search-page__form input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line-dark);
  border-radius: 13px;
  padding: 0 15px;
  outline: none;
  background: #fff;
}
.search-form input:focus, .search-page__form input:focus { border-color: var(--brand); box-shadow: 0 0 0 4px rgba(47,125,109,.1); }
.quick-links { display: flex; flex-wrap: wrap; gap: 8px 12px; margin-top: 18px; font-size: 13px; color: var(--muted); }
.quick-links a { color: var(--brand-deep); font-weight: 700; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 19px;
  border: 1px solid transparent;
  border-radius: 13px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 750;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-1px); }
.button--primary { background: var(--orange); color: #2e241a; box-shadow: 0 9px 22px rgba(242,154,63,.2); }
.button--primary:hover { background: #ee8e2d; color: #261d15; }
.button--secondary { background: var(--brand); color: #fff; }
.button--secondary:hover { background: var(--brand-deep); color: #fff; }
.button--ghost { border-color: var(--line-dark); background: rgba(255,255,255,.7); color: var(--ink); }
.button--ghost:hover { border-color: var(--brand); background: #fff; color: var(--brand-deep); }
.button--light { background: #fff; color: var(--ink); }
.button--wide { width: 100%; margin-top: 22px; }
.button--small { min-height: 40px; padding-inline: 14px; font-size: 13px; }
.inline-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.text-link { color: var(--brand-deep); font-weight: 750; }
.text-link:hover { color: #184a40; }
.text-link--arrow::after { content: " →"; }

.hero { overflow: hidden; border-bottom: 1px solid var(--line); }
.hero--home { padding: 58px 0 44px; background: linear-gradient(180deg, #f7faf6 0%, #fafbf8 100%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 54px; align-items: center; }
.hero-copy { padding-block: 20px; }
.eyebrow, .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.eyebrow::before, .kicker::before { content: ""; width: 18px; height: 3px; border-radius: 99px; background: var(--orange); }
.hero h1 {
  margin: 16px 0 18px;
  max-width: 13em;
  color: var(--ink);
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.12;
  letter-spacing: -.035em;
}
.hero-lead { margin: 0; max-width: 650px; color: #4c5759; font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.ticker { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.ticker span { padding: 8px 11px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.75); font-size: 12px; color: var(--muted); }
.hero-visual { position: relative; min-height: 520px; }
.hero-visual::before { content: ""; position: absolute; inset: 35px -20px -25px 45px; border-radius: 34px; background: #dfeae4; transform: rotate(3deg); }
.hero-visual img { position: relative; z-index: 1; width: 100%; height: 520px; object-fit: cover; border-radius: 30px; box-shadow: var(--shadow-soft); }
.hero-visual__caption {
  position: absolute;
  z-index: 2;
  left: -25px;
  bottom: 34px;
  display: grid;
  gap: 3px;
  padding: 15px 18px;
  border: 1px solid rgba(255,255,255,.85);
  border-radius: 16px;
  background: rgba(255,255,255,.9);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
}
.hero-visual__caption strong { color: var(--ink); font-size: 14px; }
.hero-visual__caption span { color: var(--muted); font-size: 12px; }

.section { padding: 78px 0; }
.section--tight { padding-top: 60px; }
.section--compact { padding: 52px 0 72px; }
.section--surface { background: var(--surface); }
.section--dark-soft { background: var(--ink); color: #eef4f0; }
.section-heading { max-width: 760px; margin-bottom: 28px; }
.section-heading--split { max-width: none; display: flex; justify-content: space-between; gap: 24px; align-items: end; }
.section-heading h2, .compare-panel__content h2, .video-intro-copy h2, .app-banner__copy h2, .split-note h2 {
  margin: 9px 0 8px;
  color: var(--ink);
  font-size: clamp(28px, 3.3vw, 42px);
  line-height: 1.24;
  letter-spacing: -.025em;
}
.section-heading p { margin: 10px 0 0; color: var(--muted); }

.feature-grid { display: grid; grid-template-columns: 1.35fr 1fr; grid-auto-rows: minmax(220px, auto); gap: 18px; }
.topic-card { overflow: hidden; display: grid; grid-template-columns: .8fr 1.2fr; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--card); box-shadow: 0 10px 30px rgba(31,42,46,.04); }
.topic-card--lead { grid-row: span 2; grid-template-columns: 1fr; }
.topic-card__media { min-height: 190px; overflow: hidden; background: #e7ece8; }
.topic-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.topic-card:hover .topic-card__media img { transform: scale(1.03); }
.topic-card__body { display: flex; flex-direction: column; align-items: flex-start; padding: 20px; }
.topic-card--lead .topic-card__body { padding: 26px; }
.topic-card__meta, .feed-item__meta { display: flex; flex-wrap: wrap; gap: 8px 14px; color: var(--muted); font-size: 11px; }
.topic-card__meta span, .feed-item__meta span { color: var(--brand-deep); font-weight: 750; }
.topic-card h3 { margin: 9px 0; color: var(--ink); font-size: 20px; line-height: 1.42; }
.topic-card--lead h3 { font-size: 27px; }
.topic-card p { margin: 0 0 14px; color: var(--muted); font-size: 13px; }
.topic-card .text-link { margin-top: auto; font-size: 13px; }

.content-rail-layout { display: grid; grid-template-columns: minmax(0,1fr) 330px; gap: 42px; align-items: start; }
.content-rail-main { min-width: 0; }
.content-rail-aside { min-width: 0; }
.sticky-stack { position: sticky; top: 100px; display: grid; gap: 16px; }
.feed-list { display: grid; }
.feed-item { position: relative; display: grid; grid-template-columns: 20px minmax(0,1fr); gap: 14px; padding: 22px 0; border-top: 1px solid var(--line-dark); }
.feed-item:first-child { border-top: 0; padding-top: 0; }
.feed-item__rail { position: relative; margin-top: 6px; }
.feed-item__rail::before { content: ""; position: absolute; left: 6px; top: 0; width: 7px; height: 7px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 5px rgba(242,154,63,.15); }
.feed-item__content h3 { margin: 6px 0 6px; color: var(--ink); font-size: 20px; line-height: 1.46; }
.feed-item__content p { margin: 0; color: var(--muted); font-size: 14px; }
.feed-item__link { display: inline-flex; margin-top: 9px; color: var(--brand-deep); font-size: 12px; font-weight: 750; }
.aside-card { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.aside-card--image { padding: 0; overflow: hidden; }
.aside-card--image img { width: 100%; height: 180px; object-fit: cover; }
.aside-card__body { padding: 18px 20px 20px; }
.aside-card--accent { border-color: rgba(47,125,109,.25); background: #eef6f2; }
.aside-card h2 { margin: 8px 0; color: var(--ink); font-size: 20px; line-height: 1.35; }
.aside-card h3 { margin: 0 0 7px; color: var(--ink); font-size: 17px; }
.aside-card p { margin: 0; color: var(--muted); font-size: 13px; }
.tag-links { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 15px; }
.tag-links a { padding: 6px 10px; border-radius: 999px; background: var(--surface); color: var(--brand-deep); font-size: 12px; font-weight: 700; }
.compact-list { margin: 14px 0 0; padding: 0; list-style: none; }
.compact-list li { padding: 9px 0; border-top: 1px solid var(--line); font-size: 13px; line-height: 1.5; }
.compact-list li:first-child { border-top: 0; }

.timeline-preview { display: grid; grid-template-columns: repeat(5,1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.timeline-preview__item { position: relative; padding: 26px 20px 28px; border-left: 1px solid var(--line); }
.timeline-preview__item:first-child { border-left: 0; }
.timeline-preview__index { margin-bottom: 34px; color: var(--orange); font-size: 12px; font-weight: 850; }
.timeline-preview__item h3 { margin: 7px 0 7px; color: var(--ink); font-size: 17px; line-height: 1.4; }
.timeline-preview__item p { margin: 0; color: var(--muted); font-size: 12px; }
.meta-label { color: var(--brand-deep); font-size: 11px; font-weight: 800; }

.video-intro-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: center; }
.kicker--light { color: #b7ded5; }
.video-intro-copy h2 { color: #fff; }
.video-intro-copy p { color: #c7d0cc; }
.video-strip { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.video-tile { position: relative; overflow: hidden; min-height: 340px; border-radius: 18px; color: #fff; background: #10191b; }
.video-tile::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,.02), rgba(0,0,0,.72)); }
.video-tile img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; opacity: .78; transition: transform .45s ease; }
.video-tile:hover img { transform: scale(1.035); }
.video-tile strong { position: absolute; z-index: 2; left: 16px; right: 16px; bottom: 18px; font-size: 14px; line-height: 1.45; }
.video-tile__play { position: absolute; z-index: 2; left: 16px; top: 16px; width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.65); border-radius: 50%; background: rgba(255,255,255,.15); backdrop-filter: blur(6px); font-size: 12px; }

.app-banner { display: grid; grid-template-columns: 300px minmax(0,1fr); gap: 32px; align-items: center; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow-card); }
.app-banner__image { border-radius: 22px; overflow: hidden; background: var(--surface); }
.app-banner__image img { width: 100%; height: 250px; object-fit: cover; }
.app-banner__copy h2 { font-size: 30px; }
.app-banner__copy p { margin: 0 0 10px; color: var(--muted); }

.page-hero { padding: 48px 0 50px; border-bottom: 1px solid var(--line); }
.page-hero--feed { background: #f6f9f5; }
.page-hero--track { background: #fbf7f4; }
.page-hero--video { background: #f5f7f6; }
.page-hero--app { background: #f8f6f7; }
.page-hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 50px; align-items: center; }
.page-hero__grid--reverse { grid-template-columns: .95fr 1.05fr; }
.page-hero__grid img { width: 100%; height: 390px; object-fit: cover; border-radius: 28px; box-shadow: var(--shadow-soft); }
.page-hero h1 { margin: 12px 0 15px; color: var(--ink); font-size: clamp(34px,4.2vw,52px); line-height: 1.18; letter-spacing: -.03em; }
.page-hero p { margin: 0; max-width: 700px; color: #596365; font-size: 16px; }
.breadcrumb { margin-bottom: 22px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 7px; list-style: none; margin: 0; padding: 0; color: var(--muted); font-size: 12px; }
.breadcrumb li + li::before { content: "/"; margin-right: 7px; color: #a1aaa4; }
.breadcrumb a:hover { color: var(--brand-deep); }

.feed-page-grid { display: grid; grid-template-columns: minmax(0,1fr) 330px; gap: 42px; align-items: start; }
.feed-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.feed-toolbar div { display: grid; }
.feed-toolbar strong { color: var(--ink); font-size: 20px; }
.feed-toolbar span { color: var(--muted); font-size: 12px; }
.feed-list--large .feed-item { padding-block: 26px; }
.feed-list--large .feed-item__content h3 { font-size: 22px; }
.feed-page-aside { display: grid; gap: 16px; }

.track-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.track-card { display: flex; flex-direction: column; min-height: 325px; padding: 23px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.track-card__top { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.track-card__top span { color: var(--pink); font-size: 28px; font-weight: 850; line-height: 1; }
.track-card__top em { font-style: normal; color: var(--muted); font-size: 11px; }
.track-card h3 { margin: 26px 0 9px; color: var(--ink); font-size: 20px; line-height: 1.45; }
.track-card p { margin: 0; color: var(--muted); font-size: 13px; }
.track-card__tags { display: flex; flex-wrap: wrap; gap: 6px 10px; margin: 18px 0 15px; color: var(--brand-deep); font-size: 11px; }
.track-card .text-link { margin-top: auto; font-size: 12px; }
.compare-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: center; }
.compare-panel__image img { width: 100%; height: 500px; object-fit: cover; border-radius: 26px; }
.compare-panel__content p { color: var(--muted); }
.principle-rows { margin-top: 24px; border-top: 1px solid var(--line); }
.principle-rows > div { display: grid; grid-template-columns: 88px 1fr; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.principle-rows strong { color: var(--brand-deep); }
.principle-rows span { color: var(--muted); }

.video-page-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.video-card { overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.video-card--featured { grid-column: span 2; }
.video-card__media { position: relative; display: block; min-height: 250px; overflow: hidden; background: var(--surface); }
.video-card--featured .video-card__media { min-height: 390px; }
.video-card__media img { width: 100%; height: 100%; position: absolute; inset: 0; object-fit: cover; transition: transform .4s ease; }
.video-card:hover .video-card__media img { transform: scale(1.025); }
.video-card__play { position: absolute; inset: 50% auto auto 50%; transform: translate(-50%,-50%); width: 50px; height: 50px; display: grid; place-items: center; border-radius: 50%; background: rgba(255,255,255,.9); color: var(--ink); box-shadow: 0 12px 40px rgba(0,0,0,.12); }
.video-card__body { padding: 20px; }
.video-card__body h2 { margin: 6px 0 8px; color: var(--ink); font-size: 20px; line-height: 1.42; }
.video-card--featured .video-card__body h2 { font-size: 27px; }
.video-card__body p { margin: 0 0 12px; color: var(--muted); font-size: 13px; }
.video-card__body .text-link { font-size: 12px; }
.split-note { display: grid; grid-template-columns: .65fr 1.35fr; gap: 50px; align-items: start; }
.detail-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; }
.detail-grid article { padding: 20px; border: 1px solid var(--line); border-radius: 17px; background: #fff; }
.detail-grid strong { color: var(--ink); font-size: 18px; }
.detail-grid p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.app-feature-grid { display: grid; grid-template-columns: 1.4fr .6fr; gap: 18px; }
.app-feature { overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: #fff; }
.app-feature img { width: 100%; height: 280px; object-fit: cover; }
.app-feature > div { padding: 24px; }
.app-feature h2 { margin: 8px 0 10px; color: var(--ink); font-size: 24px; line-height: 1.35; }
.app-feature p { margin: 0; color: var(--muted); }
.app-feature--large { display: grid; grid-template-columns: .8fr 1.2fr; }
.app-feature--large img { height: 100%; min-height: 420px; }
.app-feature--large > div { display: flex; flex-direction: column; justify-content: center; padding: 34px; }
.app-feature--large h2 { font-size: 30px; }
.principles-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; }
.principles-grid article { padding: 24px; border-top: 3px solid var(--brand); border-radius: 0 0 16px 16px; background: #fff; }
.principles-grid h3 { margin: 0 0 7px; color: var(--ink); font-size: 18px; }
.principles-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.topic-header { padding: 48px 0 46px; background: #f5f8f4; border-bottom: 1px solid var(--line); }
.topic-header__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.topic-header__copy h1 { margin: 11px 0 16px; color: var(--ink); font-size: clamp(36px,4.5vw,56px); line-height: 1.16; letter-spacing: -.032em; }
.topic-meta { display: flex; gap: 12px; color: var(--muted); font-size: 12px; }
.topic-meta span { color: var(--brand-deep); font-weight: 800; }
.topic-deck { color: #556063; font-size: 17px; line-height: 1.85; }
.topic-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.topic-tags span { padding: 6px 10px; border-radius: 999px; background: #e6efe9; color: var(--brand-deep); font-size: 12px; }
.topic-header__media { margin: 0; }
.topic-header__media img { width: 100%; height: 440px; object-fit: cover; border-radius: 28px; box-shadow: var(--shadow-soft); }
.topic-header__media figcaption { margin-top: 10px; color: var(--muted); font-size: 11px; text-align: center; }
.topic-body-grid { display: grid; grid-template-columns: minmax(0,var(--reading)) 300px; gap: 56px; justify-content: center; align-items: start; }
.topic-article { color: #374143; font-size: 17px; line-height: 1.95; }
.topic-article h2 { margin: 40px 0 14px; color: var(--ink); font-size: 27px; line-height: 1.35; }
.topic-article h2:first-child { margin-top: 0; }
.topic-article p { margin: 0 0 22px; }
.checkpoint-box { margin-top: 42px; padding: 28px; border-radius: 20px; background: #eef5f1; border: 1px solid #dce9e2; }
.checkpoint-box h2 { margin-top: 9px; }
.checkpoint-box ol { margin: 17px 0 0; padding-left: 22px; }
.checkpoint-box li { margin: 9px 0; padding-left: 4px; }
.related-list { display: grid; margin-top: 10px; }
.related-list a { display: grid; gap: 3px; padding: 14px 0; border-top: 1px solid rgba(47,125,109,.16); }
.related-list a:first-child { border-top: 0; }
.related-list span { color: var(--muted); font-size: 11px; }
.related-list strong { color: var(--ink); font-size: 13px; line-height: 1.5; }
.stack-links { display: grid; margin-top: 8px; }
.stack-links a { padding: 10px 0; border-top: 1px solid var(--line); color: var(--brand-deep); font-size: 13px; font-weight: 700; }
.stack-links a:first-child { border-top: 0; }

.search-page { padding: 50px 0 80px; }
.search-page__inner { max-width: 920px; }
.search-page h1 { margin: 8px 0 22px; color: var(--ink); font-size: 42px; line-height: 1.2; }
.search-page__form { max-width: 760px; }
.search-empty { display: grid; grid-template-columns: 330px 1fr; gap: 32px; align-items: center; margin-top: 42px; padding: 24px; border-radius: 24px; background: var(--surface); }
.search-empty img { width: 100%; height: 250px; object-fit: cover; border-radius: 18px; }
.search-empty h2, .no-results h2, .search-result-head h2 { margin: 0 0 8px; color: var(--ink); font-size: 24px; }
.search-empty p, .no-results p { margin: 0; color: var(--muted); }
.search-result-head { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin-top: 42px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.search-result-head span { color: var(--muted); font-size: 12px; }
.search-results { margin-top: 10px; }
.no-results { margin-top: 36px; padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }

.status-page { min-height: 64vh; display: grid; place-items: center; padding: 60px 0; }
.status-page__inner { max-width: 720px; text-align: center; }
.status-code { display: block; color: var(--pink); font-size: 90px; font-weight: 900; line-height: 1; letter-spacing: -.06em; }
.status-page h1 { margin: 16px 0 8px; color: var(--ink); font-size: 38px; }
.status-page p { margin: 0 auto; max-width: 580px; color: var(--muted); }
.status-page .inline-actions { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); background: #eef2ee; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 48px; padding: 50px 0 34px; }
.footer-brand { color: var(--ink); font-size: 24px; font-weight: 850; }
.footer-grid p { max-width: 500px; margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.footer-grid nav { display: grid; align-content: start; gap: 9px; }
.footer-grid h2 { margin: 0 0 4px; color: var(--ink); font-size: 14px; }
.footer-grid nav a { color: var(--muted); font-size: 13px; }
.footer-grid nav a:hover { color: var(--brand-deep); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 18px 0 24px; border-top: 1px solid var(--line-dark); color: var(--muted); font-size: 11px; }

.badge { display: inline-flex; padding: 4px 8px; border-radius: 999px; font-size: 11px; font-weight: 750; }
.badge--teal { background: #e4f0ec; color: var(--brand-deep); }
.badge--pink { background: #f8e7ee; color: #a04d6c; }
.badge--orange { background: #fff0df; color: #9d5715; }
.badge--slate { background: #edf0f0; color: #586163; }

@media (max-width: 1080px) {
  :root { --shell: min(100% - 34px, 1000px); }
  .desktop-nav { display: none; }
  .header-actions { margin-left: auto; }
  .menu-button { display: grid; }
  .hero-grid, .page-hero__grid, .page-hero__grid--reverse, .topic-header__grid { gap: 34px; }
  .hero h1 { font-size: 48px; }
  .feature-grid { grid-template-columns: 1.1fr .9fr; }
  .content-rail-layout, .feed-page-grid { grid-template-columns: minmax(0,1fr) 300px; gap: 28px; }
  .timeline-preview { grid-template-columns: repeat(3,1fr); }
  .timeline-preview__item:nth-child(4) { border-left: 0; }
  .timeline-preview__item:nth-child(n+4) { border-top: 1px solid var(--line); }
  .track-grid { grid-template-columns: repeat(2,1fr); }
  .video-page-grid { grid-template-columns: repeat(2,1fr); }
  .principles-grid { grid-template-columns: repeat(2,1fr); }
  .topic-body-grid { grid-template-columns: minmax(0,1fr) 280px; gap: 36px; }
}

@media (max-width: 820px) {
  :root { --shell: min(100% - 28px, 760px); }
  .header-row { min-height: 70px; }
  .button-label { display: none; }
  .hero--home { padding-top: 32px; }
  .hero-grid, .page-hero__grid, .page-hero__grid--reverse, .topic-header__grid, .compare-panel, .video-intro-grid, .split-note, .app-feature--large, .topic-body-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 410px; }
  .hero-visual img { height: 410px; }
  .hero-visual__caption { left: 18px; bottom: 20px; }
  .section { padding: 58px 0; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .topic-card--lead { grid-row: auto; grid-column: span 2; grid-template-columns: .9fr 1.1fr; }
  .content-rail-layout, .feed-page-grid { grid-template-columns: 1fr; }
  .content-rail-aside, .feed-page-aside { order: 2; }
  .sticky-stack { position: static; grid-template-columns: repeat(2,1fr); }
  .aside-card--image { grid-column: span 2; }
  .timeline-preview { grid-template-columns: repeat(2,1fr); }
  .timeline-preview__item:nth-child(odd) { border-left: 0; }
  .timeline-preview__item:nth-child(even) { border-left: 1px solid var(--line); }
  .timeline-preview__item:nth-child(n+3) { border-top: 1px solid var(--line); }
  .video-strip { grid-template-columns: repeat(3,1fr); }
  .video-tile { min-height: 280px; }
  .app-banner { grid-template-columns: 220px 1fr; }
  .page-hero__grid img { order: -1; height: 340px; }
  .track-grid, .video-page-grid { grid-template-columns: repeat(2,1fr); }
  .video-card--featured { grid-column: span 2; }
  .app-feature-grid { grid-template-columns: 1fr; }
  .app-feature--large img { min-height: 310px; max-height: 360px; }
  .topic-header__media { order: -1; }
  .topic-header__media img { height: 360px; }
  .topic-aside { order: 2; }
  .topic-aside .sticky-stack { display: grid; grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > section { grid-column: span 2; }
}

@media (max-width: 600px) {
  :root { --shell: calc(100vw - 24px); --radius-xl: 22px; }
  body { font-size: 15px; }
  .brand img { width: 42px; height: 42px; }
  .brand__text small { display: none; }
  .header-actions { gap: 4px; }
  .icon-button, .menu-button { width: 40px; height: 40px; justify-content: center; padding: 0; }
  .search-dialog__panel { margin-top: 7vh; padding: 20px; border-radius: 20px; }
  .search-form__row, .search-page__form > div { flex-direction: column; }
  .hero--home { padding: 28px 0 34px; }
  .hero h1 { font-size: 38px; }
  .hero-lead { font-size: 16px; }
  .hero-actions .button { flex: 1 1 160px; }
  .hero-visual { min-height: 310px; }
  .hero-visual::before { inset: 20px -8px -12px 24px; }
  .hero-visual img { height: 310px; border-radius: 22px; }
  .hero-visual__caption { right: 14px; left: 14px; bottom: 14px; }
  .section { padding: 48px 0; }
  .section-heading--split { align-items: flex-start; flex-direction: column; gap: 8px; }
  .section-heading h2, .compare-panel__content h2, .video-intro-copy h2, .app-banner__copy h2, .split-note h2 { font-size: 28px; }
  .feature-grid { grid-template-columns: 1fr; }
  .topic-card, .topic-card--lead { grid-column: auto; grid-template-columns: 1fr; }
  .topic-card__media { height: 210px; }
  .topic-card--lead .topic-card__media { height: 250px; }
  .topic-card__body, .topic-card--lead .topic-card__body { padding: 18px; }
  .topic-card--lead h3 { font-size: 22px; }
  .feed-item { grid-template-columns: 15px minmax(0,1fr); gap: 9px; padding-block: 20px; }
  .feed-item__rail::before { left: 3px; }
  .feed-item__content h3, .feed-list--large .feed-item__content h3 { font-size: 18px; }
  .sticky-stack { grid-template-columns: 1fr; }
  .aside-card--image { grid-column: auto; }
  .timeline-preview { grid-template-columns: 1fr; border: 0; }
  .timeline-preview__item, .timeline-preview__item:nth-child(even), .timeline-preview__item:nth-child(odd) { border: 0; border-top: 1px solid var(--line); padding: 22px 0; }
  .timeline-preview__item:last-child { border-bottom: 1px solid var(--line); }
  .timeline-preview__index { margin-bottom: 14px; }
  .video-intro-grid { gap: 30px; }
  .video-strip { grid-template-columns: 1fr; }
  .video-tile { min-height: 210px; }
  .app-banner { grid-template-columns: 1fr; padding: 16px; }
  .app-banner__image img { height: 220px; }
  .page-hero { padding: 32px 0 38px; }
  .page-hero__grid { gap: 24px; }
  .page-hero__grid img { height: 260px; border-radius: 20px; }
  .page-hero h1 { font-size: 34px; }
  .feed-toolbar { align-items: flex-start; }
  .feed-toolbar .button { flex: 0 0 auto; }
  .track-grid, .video-page-grid, .detail-grid, .principles-grid { grid-template-columns: 1fr; }
  .track-card { min-height: 0; }
  .compare-panel__image img { height: 300px; }
  .video-card--featured { grid-column: auto; }
  .video-card__media, .video-card--featured .video-card__media { min-height: 250px; }
  .app-feature--large { display: block; }
  .app-feature--large img { min-height: 0; height: 260px; }
  .app-feature > div, .app-feature--large > div { padding: 20px; }
  .app-feature--large h2 { font-size: 24px; }
  .topic-header { padding: 32px 0 34px; }
  .topic-header__grid { gap: 24px; }
  .topic-header__media img { height: 270px; border-radius: 20px; }
  .topic-header__copy h1 { font-size: 34px; }
  .topic-deck { font-size: 15px; }
  .topic-article { font-size: 16px; line-height: 1.85; }
  .topic-article h2 { font-size: 24px; }
  .checkpoint-box { padding: 20px; }
  .topic-aside .sticky-stack { grid-template-columns: 1fr; }
  .search-page { padding-top: 32px; }
  .search-page h1 { font-size: 34px; }
  .search-empty { grid-template-columns: 1fr; padding: 16px; }
  .search-empty img { height: 220px; }
  .search-result-head { align-items: flex-start; flex-direction: column; gap: 3px; }
  .status-code { font-size: 72px; }
  .status-page h1 { font-size: 30px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-grid > section { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media print {
  .site-header, .site-footer, .search-dialog, .hero-actions, .button, .text-link { display: none !important; }
  body { background: #fff; color: #000; }
  .section, .topic-header, .page-hero { padding: 20px 0; background: #fff !important; }
  .shell { width: 100%; }
  a { color: #000; }
}