/* ============================================================
   造物集 · apps.itabas.com 设计系统 v4（陈列馆 · 上下布局 · 双主题）
   第一屏：全屏居中大标题；第二屏：全宽轮播大屏。
   ============================================================ */

:root {
  /* 亮色主题（默认）：暖纸 + 暖墨 + 朱砂 */
  --bg: #f6f1e8;
  --bg-soft: #efe9dd;
  --bg-card: #fdfaf4;
  --fg: #2c2a25;
  --fg-soft: #4c4840;
  --muted: #857d6e;
  --faint: #aba291;
  --ink: #262420;
  --on-ink: #f9f5ec;
  --accent: #b6482e;
  --accent-soft: #c9613f;
  --line: #e5ddcd;
  --line-strong: #d3c9b4;
  --green: #3d7d5c;
  --amber: #b97f24;
  --gray: #98907f;
  --cat-study: #3d7d5c;
  --cat-ai: #7c5cc9;
  --cat-media: #cf4a6a;
  --cat-cosmos: #b07a1e;
  --cat-life: #cf6428;
  --cat-tools: #2f7ea8;
  --radius: 16px;
  --shadow-card: 0 1px 2px rgba(60, 48, 32, 0.05), 0 8px 24px -12px rgba(60, 48, 32, 0.12);
  --shadow-lift: 0 2px 4px rgba(60, 48, 32, 0.06), 0 20px 44px -16px rgba(60, 48, 32, 0.2);
  --shadow-stage: 0 4px 8px rgba(60, 48, 32, 0.06), 0 40px 88px -28px rgba(60, 48, 32, 0.32);
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STZhongsong", "SimSun", serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
  --nav-h: 64px;
}

[data-theme="dark"] {
  /* 暗色主题：暖褐黑 + 米白 + 亮朱砂 */
  --bg: #15120e;
  --bg-soft: #1b1712;
  --bg-card: #221d16;
  --fg: #ede5d6;
  --fg-soft: #d2c8b6;
  --muted: #a29784;
  --faint: #6e6454;
  --ink: #f2ebdd;
  --on-ink: #1c1813;
  --accent: #e0825a;
  --accent-soft: #ec9a76;
  --line: #2e2820;
  --line-strong: #423a2c;
  --green: #5cb98a;
  --amber: #dfae4e;
  --gray: #847b6a;
  --cat-study: #5cb98a;
  --cat-ai: #ab90e8;
  --cat-media: #e77d95;
  --cat-cosmos: #dfae4e;
  --cat-life: #ec8b52;
  --cat-tools: #6bb4d9;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.4), 0 20px 44px -16px rgba(0, 0, 0, 0.6);
  --shadow-stage: 0 4px 8px rgba(0, 0, 0, 0.4), 0 40px 88px -28px rgba(0, 0, 0, 0.7);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 56px);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.35s ease, color 0.35s ease;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--fg);
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--ink);
  color: var(--on-ink);
  padding: 10px 18px;
  border-radius: 0 0 10px 0;
}

.skip-link:focus {
  left: 0;
}

::selection {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: var(--fg);
}

/* ---------- 导航 ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s ease, background-color 0.35s ease;
}

.nav.solid {
  border-bottom-color: var(--line);
}

.nav-inner {
  max-width: 1240px;
  margin-inline: auto;
  height: 100%;
  padding: 0 clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.nav-logo {
  width: 32px;
  height: 32px;
}

.nav-word {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--fg);
}

.nav-word i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.34em;
  color: var(--faint);
  margin-left: 10px;
  vertical-align: 3px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.5vw, 24px);
}

.nav-links {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  transition: color 0.25s ease;
}

.nav-links a:hover {
  color: var(--fg);
}

/* 主题切换按钮 */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--bg-card);
  color: var(--fg);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 0.25s ease, transform 0.25s ease, background-color 0.35s ease;
}

.theme-toggle:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}

.theme-toggle .ti-sun {
  display: none;
}

.theme-toggle .ti-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .ti-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .ti-moon {
  display: none;
}

/* ---------- 第一屏：全屏居中大标题 ---------- */

.hero {
  position: relative;
  min-height: 88svh;
  display: grid;
  place-items: center;
  padding: calc(var(--nav-h) + 24px) 24px 72px;
  overflow: hidden;
}

/* 极淡的背景装饰：一团朱砂一团琥珀，暖而不抢 */
.hero-deco {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 40% 34% at 76% 22%, rgba(182, 72, 46, 0.06), transparent 70%),
    radial-gradient(ellipse 36% 30% at 22% 68%, rgba(207, 100, 40, 0.05), transparent 70%);
}

[data-theme="dark"] .hero-deco {
  background:
    radial-gradient(ellipse 42% 36% at 76% 22%, rgba(224, 130, 90, 0.07), transparent 70%),
    radial-gradient(ellipse 38% 32% at 22% 68%, rgba(176, 122, 30, 0.06), transparent 70%);
}

.hero-inner {
  position: relative;
  text-align: center;
  max-width: 880px;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.36em;
  color: var(--accent);
  margin-bottom: 26px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(76px, 14vw, 164px);
  font-weight: 900;
  letter-spacing: 0.12em;
  margin-left: 0.12em;
  line-height: 1.04;
  color: var(--ink);
}

.hero-slogan {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  letter-spacing: 0.34em;
  margin-left: 0.34em;
  color: var(--accent);
  margin-top: 20px;
}

.hero-sub {
  color: var(--muted);
  font-size: 15.5px;
  max-width: 600px;
  margin: 22px auto 0;
}

.hero-stats {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 14px;
  margin: 32px 0 36px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.06em;
  flex-wrap: wrap;
}

.hero-stats b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-right: 5px;
}

.hero-stats .sep {
  color: var(--line-strong);
}

.hero-cta-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-solid,
.btn-ghost {
  display: inline-block;
  padding: 13px 32px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background-color 0.35s ease;
}

.btn-solid {
  background: var(--ink);
  color: var(--on-ink);
  box-shadow: 0 10px 26px -14px color-mix(in srgb, var(--ink) 70%, transparent);
}

.btn-solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px -14px color-mix(in srgb, var(--ink) 80%, transparent);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--fg);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--ink);
}

/* 向下滚动提示：左下角竖排，中底部留给大屏露头 */
.hero-scroll {
  position: absolute;
  left: clamp(16px, 3.5vw, 44px);
  bottom: 30px;
  display: grid;
  justify-items: center;
  gap: 9px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--faint);
  text-decoration: none;
  writing-mode: vertical-rl;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--faint));
  animation: scroll-pulse 2.2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%,
  100% {
    opacity: 0.3;
    transform: scaleY(0.7);
    transform-origin: top;
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* ---------- 第二屏：全宽轮播大屏 ---------- */

.stage {
  padding: 8px clamp(16px, 4vw, 48px) 72px;
}

.stage-window {
  max-width: 1400px;
  margin-inline: auto;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-card);
  box-shadow: var(--shadow-stage);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.stage-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 44px;
  padding: 0 16px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.35s ease;
}

.stage-dots-trio {
  display: inline-flex;
  gap: 6px;
}

.stage-dots-trio i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line-strong);
}

.stage-pill {
  flex: 1;
  max-width: 420px;
  margin-inline: auto;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 4px 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background-color 0.35s ease;
}

.stage-open {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--fg);
  text-decoration: none;
  padding: 5px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 99px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.stage-open:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}

.stage-screen {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #0b1018;
}

.stage-shot {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  opacity: 0;
  transition: opacity 0.9s ease;
}

.stage-shot.on {
  opacity: 1;
}

/* 控制条 */
.stage-ctrl {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 22px;
}

.stage-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--bg-card);
  color: var(--fg);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 0.25s ease, transform 0.25s ease, background-color 0.35s ease;
}

.stage-arrow:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}

.stage-dots {
  display: flex;
  gap: 7px;
}

.stage-dots button {
  width: 24px;
  height: 4px;
  border: 0;
  border-radius: 99px;
  background: var(--line-strong);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  padding: 0;
  transition: background 0.3s ease;
}

.stage-dots button:hover {
  background: var(--faint);
}

.stage-dots button.on {
  background: color-mix(in srgb, var(--ink) 14%, transparent);
}

.stage-dots button.on::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform-origin: left;
  animation: fillbar var(--dur, 8s) linear forwards;
}

@keyframes fillbar {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

.stage-credit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--faint);
}

.stage-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
}

/* ---------- 分类导航条 ---------- */

.cat-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.35s ease;
}

.cat-bar-inner {
  max-width: 1240px;
  margin-inline: auto;
  padding: 0 clamp(16px, 4vw, 48px);
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.cat-bar-inner::-webkit-scrollbar {
  display: none;
}

.cat-chip {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 16px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
  white-space: nowrap;
}

.cat-chip i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--faint);
}

.cat-chip:hover {
  color: var(--fg);
}

.cat-chip.active {
  color: var(--fg);
  border-bottom-color: var(--cat, var(--ink));
}

.cat-chip.active i {
  color: var(--cat, var(--ink));
}

/* ---------- 书架区块 ---------- */

main {
  max-width: 1240px;
  margin-inline: auto;
  padding: 0 clamp(16px, 4vw, 48px);
}

.sec {
  padding: clamp(56px, 9vw, 100px) 0 8px;
}

.sec-head {
  margin-bottom: 32px;
}

.sec-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(27px, 4vw, 38px);
  font-weight: 900;
  letter-spacing: 0.06em;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.sec-head h2 .num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--cat, var(--ink));
}

.sec-head h2 .en {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--faint);
}

.sec-head p {
  color: var(--muted);
  margin-top: 8px;
  font-size: 15px;
}

/* ---------- 应用卡片 ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}

.card {
  --cat: var(--ink);
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 22px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--fg);
  box-shadow: var(--shadow-card);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease, background-color 0.35s ease;
}

a.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--line-strong);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: color-mix(in srgb, var(--cat) 10%, transparent);
  color: var(--cat);
  transition: transform 0.28s ease;
}

.card-icon svg {
  width: 27px;
  height: 27px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

a.card:hover .card-icon {
  transform: translateY(-2px) scale(1.05);
}

.card-body {
  min-width: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 6px;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.4;
}

.card-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.65;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 4px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  white-space: nowrap;
  flex: none;
}

.status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dot, var(--gray));
}

.status-live {
  --dot: var(--green);
}

.status-wip {
  --dot: var(--amber);
}

.status-building {
  --dot: var(--gray);
}

.card-open {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cat);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

a.card:hover .card-open {
  opacity: 1;
  transform: none;
}

/* 建设中的卡片：降调、不可点 */
.card.building {
  background: var(--bg-soft);
  box-shadow: none;
}

.card.building .card-icon {
  color: var(--gray);
  background: color-mix(in srgb, var(--gray) 12%, transparent);
}

.card-building-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faint);
}

/* ---------- 关于 ---------- */

.sec-about,
.sec-eco {
  max-width: 1240px;
  margin-inline: auto;
  padding-left: clamp(16px, 4vw, 48px);
  padding-right: clamp(16px, 4vw, 48px);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.about-card {
  padding: 26px 24px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
  align-content: start;
  box-shadow: var(--shadow-card);
  transition: background-color 0.35s ease;
}

.about-card b {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.about-card span {
  font-size: 14px;
  color: var(--muted);
}

.about-note {
  margin-top: 22px;
  padding: 18px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14.5px;
  color: var(--muted);
  background: var(--bg-card);
  transition: background-color 0.35s ease;
}

.about-note b {
  color: var(--fg);
  font-weight: 700;
}

.about-note code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 6px;
}

/* ---------- 小宇宙 ---------- */

.eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.eco-card {
  display: block;
  padding: 26px 24px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.35s ease, background-color 0.35s ease;
}

.eco-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.eco-card .eco-en {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--faint);
}

.eco-card b {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin: 8px 0 4px;
}

.eco-card span {
  font-size: 13.5px;
  color: var(--muted);
}

.eco-card.current {
  border-color: var(--ink);
}

/* ---------- 页脚 ---------- */

.footer {
  margin-top: clamp(56px, 9vw, 96px);
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  transition: background-color 0.35s ease;
}

.footer-inner {
  max-width: 1240px;
  margin-inline: auto;
  padding: 44px clamp(20px, 5vw, 48px) 52px;
  text-align: center;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.footer-logo {
  width: 26px;
  height: 26px;
}

.footer-note {
  font-size: 12.5px;
  color: var(--faint);
  max-width: 640px;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.1em;
}

/* ---------- 入场动画 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

.cards .card {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.28s ease, border-color 0.28s ease, background-color 0.35s ease;
}

.cards.in .card {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .hero-scroll-line {
    animation: none;
  }
  .stage-dots button.on::after {
    animation: none;
  }
  .reveal,
  .cards .card {
    opacity: 1 !important;
    transform: none !important;
    transition: none;
  }
}

/* ---------- 移动端 ---------- */

@media (max-width: 640px) {
  .nav-word i {
    display: none;
  }
  .nav-links {
    gap: 14px;
  }
  .hero-title {
    font-size: clamp(58px, 17vw, 76px);
  }
  .hero-slogan {
    letter-spacing: 0.24em;
    margin-left: 0.24em;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    gap: 10px;
  }
  .hero-scroll {
    display: none;
  }
  .stage-pill {
    font-size: 10.5px;
  }
  .stage-open span {
    display: none;
  }
  .stage-screen {
    aspect-ratio: 16 / 10;
  }
}