/* =========================================================
   Julink · 营销落地页
   设计基调：深空玻璃 · 极光 · 立体层级
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 品牌色 */
  --accent: #F97316;
  --accent-hi: #FFA24D;
  --accent-soft: rgba(249, 115, 22, 0.13);
  --accent-ring: rgba(249, 115, 22, 0.32);
  --accent-text: #C2570B;

  /* 表面 */
  --bg: #FAFAFC;
  --surface: #FFFFFF;
  --surface-2: #F2F3F7;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-raised: #FFFFFF;

  /* 文字 */
  --text: #14151A;
  --muted: #5E6472;
  --faint: #8B90A0;

  /* 线与光 */
  --line: rgba(18, 20, 32, 0.09);
  --line-2: rgba(18, 20, 32, 0.16);
  --hi: rgba(255, 255, 255, 0.9);
  --grid-line: rgba(18, 20, 32, 0.055);
  --grain-op: 0.035;

  /* 立体阴影：近 → 远 → 接触 */
  --sh-1: 0 1px 2px rgba(18, 20, 32, 0.06);
  --sh-2: 0 10px 24px -10px rgba(18, 20, 32, 0.14);
  --sh-3: 0 30px 64px -26px rgba(18, 20, 32, 0.24);
  --sh-glow: 0 18px 46px -14px var(--accent-ring);

  --radius: 18px;
  --radius-sm: 11px;
  --radius-lg: 26px;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-display: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Inter",
    "PingFang SC", "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Monaco,
    "Cascadia Mono", Consolas, monospace;

  --max: 1160px;
  --ease: cubic-bezier(0.22, 0.8, 0.24, 1);

  color-scheme: light;
}

/* 深色（默认值 + 系统深色 + 手动深色共用同一套令牌） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #FF8A2B;
    --accent-hi: #FFB067;
    --accent-soft: rgba(255, 138, 43, 0.15);
    --accent-ring: rgba(255, 138, 43, 0.34);
    --accent-text: #FFA24D;

    --bg: #07080C;
    --surface: #0F1117;
    --surface-2: #171A22;
    --surface-glass: rgba(16, 18, 25, 0.66);
    --surface-raised: #171B24;

    --text: #F2F3F7;
    --muted: #9BA0AE;
    --faint: #6A7080;

    --line: rgba(255, 255, 255, 0.09);
    --line-2: rgba(255, 255, 255, 0.17);
    --hi: rgba(255, 255, 255, 0.11);
    --grid-line: rgba(255, 255, 255, 0.045);
    --grain-op: 0.055;

    --sh-1: 0 1px 2px rgba(0, 0, 0, 0.5);
    --sh-2: 0 12px 28px -10px rgba(0, 0, 0, 0.62);
    --sh-3: 0 34px 70px -26px rgba(0, 0, 0, 0.78);
    --sh-glow: 0 20px 52px -14px var(--accent-ring);

    color-scheme: dark;
  }
}

html[data-theme="dark"] {
  --accent: #FF8A2B;
  --accent-hi: #FFB067;
  --accent-soft: rgba(255, 138, 43, 0.15);
  --accent-ring: rgba(255, 138, 43, 0.34);
  --accent-text: #FFA24D;

  --bg: #07080C;
  --surface: #0F1117;
  --surface-2: #171A22;
  --surface-glass: rgba(16, 18, 25, 0.66);
  --surface-raised: #171B24;

  --text: #F2F3F7;
  --muted: #9BA0AE;
  --faint: #6A7080;

  --line: rgba(255, 255, 255, 0.09);
  --line-2: rgba(255, 255, 255, 0.17);
  --hi: rgba(255, 255, 255, 0.11);
  --grid-line: rgba(255, 255, 255, 0.045);
  --grain-op: 0.055;

  --sh-1: 0 1px 2px rgba(0, 0, 0, 0.5);
  --sh-2: 0 12px 28px -10px rgba(0, 0, 0, 0.62);
  --sh-3: 0 34px 70px -26px rgba(0, 0, 0, 0.78);
  --sh-glow: 0 20px 52px -14px var(--accent-ring);

  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;
}

/* ---------- 2. 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* 横向裁切必须落在 body 上。
   实测（Chromium）：写在 html 上时 overflow 会传播到视口，
   视口的 `overflow-x: clip` 拦不住程序化横向滚动 —— 装配时飞出的零件
   会让整页被拖出 141px 的横向位移。
   写在 body 上则直接裁剪 body 自身的溢出区域，纵向滚动与 sticky 均不受影响。 */
html,
body {
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* 兜底：内联 SVG 若漏写尺寸，浏览器会按 100% 撑开，
   一个图标就能把整页布局炸掉。这里统一给 1em 默认值，
   各图标类（.btn svg / .card-icon svg 等）再按需覆盖。 */
svg {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

::selection {
  background: var(--accent-soft);
  color: var(--text);
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

section[id] {
  scroll-margin-top: 96px;
}

/* ---------- 3. 氛围背景层 ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-aurora {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
}

.blob-a {
  width: 62vw;
  height: 62vw;
  max-width: 820px;
  max-height: 820px;
  top: -26vw;
  left: -10vw;
  background: radial-gradient(circle, var(--accent) 0%, transparent 66%);
  opacity: 0.3;
  animation: drift-a 26s var(--ease) infinite alternate;
}

.blob-b {
  width: 54vw;
  height: 54vw;
  max-width: 720px;
  max-height: 720px;
  top: 8vh;
  right: -14vw;
  background: radial-gradient(circle, #4C6FFF 0%, transparent 66%);
  opacity: 0.26;
  animation: drift-b 32s var(--ease) infinite alternate;
}

.blob-c {
  width: 46vw;
  height: 46vw;
  max-width: 620px;
  max-height: 620px;
  bottom: -18vw;
  left: 26vw;
  background: radial-gradient(circle, var(--accent-hi) 0%, transparent 68%);
  opacity: 0.16;
  animation: drift-c 38s var(--ease) infinite alternate;
}

/* 浅色模式下暖色极光需要压低，否则整块发橘、显得廉价 */
html[data-theme="light"] .blob-a {
  opacity: 0.13;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .blob-a {
    opacity: 0.13;
  }
}

/* 冷色极光在浅色背景下需要压暗，否则会发灰 */
html[data-theme="light"] .blob-b {
  opacity: 0.12;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .blob-b {
    opacity: 0.12;
  }
}

@keyframes drift-a {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(6vw, 5vh, 0) scale(1.14); }
}
@keyframes drift-b {
  from { transform: translate3d(0, 0, 0) scale(1.06); }
  to   { transform: translate3d(-7vw, 7vh, 0) scale(0.94); }
}
@keyframes drift-c {
  from { transform: translate3d(0, 0, 0) scale(0.96); }
  to   { transform: translate3d(4vw, -6vh, 0) scale(1.12); }
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 85% 62% at 50% 0%, #000 0%, transparent 76%);
  mask-image: radial-gradient(ellipse 85% 62% at 50% 0%, #000 0%, transparent 76%);
}

.bg-grain {
  position: absolute;
  inset: 0;
  opacity: var(--grain-op);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.bg-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 100% 70% at 50% 40%, transparent 55%, rgba(0, 0, 0, 0.16) 100%);
}

html[data-theme="light"] .bg-vignette {
  background: radial-gradient(ellipse 100% 70% at 50% 40%, transparent 60%, rgba(20, 22, 34, 0.07) 100%);
}

main,
.site-header,
.site-footer {
  position: relative;
  z-index: 1;
}

/* ---------- 4. 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  background: transparent;
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.site-header.is-stuck {
  background: var(--surface-glass);
  box-shadow: 0 1px 0 var(--line), 0 10px 30px -22px rgba(0, 0, 0, 0.5);
}

.header-line {
  display: block;
  height: 1px;
  opacity: 0;
  transition: opacity 0.25s var(--ease);
  background: linear-gradient(90deg, transparent, var(--accent-ring) 22%, var(--accent) 50%, var(--accent-ring) 78%, transparent);
}

.site-header.is-stuck .header-line {
  opacity: 0.7;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 66px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 650;
  font-size: 1.05rem;
  letter-spacing: -0.025em;
  font-family: var(--font-display);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow: 0 4px 14px -2px var(--accent-ring), 0 0 0 1px var(--line);
}

.brand-mark img {
  width: 30px;
  height: 30px;
  display: block;
}

.brand-name {
  background: linear-gradient(180deg, var(--text) 0%, var(--faint) 160%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  padding: 0.25rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-glass);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
}

.nav-links a {
  position: relative;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.nav-links a.active {
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--sh-1), inset 0 1px 0 var(--hi);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  background: var(--surface-glass);
  border-radius: 11px;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--muted);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

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

.theme-toggle svg {
  width: 17px;
  height: 17px;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 0.2rem;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--surface-glass);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
}

.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  padding: 0.32rem 0.55rem;
  border-radius: 8px;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.lang-toggle button:hover {
  color: var(--text);
}

.lang-toggle button.is-active {
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--sh-1), inset 0 1px 0 var(--hi);
}

.lang-toggle button:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 1px;
}

@media (max-width: 420px) {
  .lang-toggle button {
    padding: 0.3rem 0.42rem;
    font-size: 0.72rem;
  }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.68rem 1.15rem;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(180deg, var(--accent-hi) 0%, var(--accent) 62%);
  color: #2A1A00;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45),
    inset 0 -1px 0 rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.18),
    0 12px 28px -10px var(--accent-ring);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5),
    inset 0 -1px 0 rgba(0, 0, 0, 0.12), 0 4px 10px rgba(0, 0, 0, 0.22),
    0 18px 38px -12px var(--accent-ring);
}

.btn-secondary {
  background: var(--surface-glass);
  color: var(--text);
  border-color: var(--line);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  background: var(--surface);
  border-color: var(--line-2);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2);
}

.btn:active {
  transform: translateY(0) scale(0.985);
}

.btn-lg {
  padding: 0.92rem 1.45rem;
  font-size: 1rem;
}

/* ---------- 6. Hero · 装配舞台 ---------- */
.hero {
  padding: 5.5rem 0 3.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.34rem 0.8rem 0.34rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-ring);
  color: var(--accent-text);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 1.4rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px var(--accent-soft); }
  50%      { opacity: 0.55; box-shadow: 0 0 0 6px transparent; }
}

.hero-lead {
  margin: 0 0 2rem;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 34rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-meta svg {
  width: 15px;
  height: 15px;
  color: var(--accent-text);
}

.hero-grid {
  display: grid;
  gap: 3.5rem;
  align-items: center;
}

@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1.02fr 0.98fr;
    gap: 4rem;
  }
}

/* 标题：装配推进到末段时换成收尾文案 */
.hero-h1 {
  position: relative;
  min-height: 2.1em;
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.7rem, 6.4vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.05em;
  font-weight: 700;
}

.h1-line {
  display: block;
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.h1-c {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  transform: translateY(18px);
  pointer-events: none;
}

.hero-h1.swap .h1-a,
.hero-h1.swap .h1-b {
  opacity: 0;
  transform: translateY(-18px);
}

.hero-h1.swap .h1-c {
  opacity: 1;
  transform: none;
}

/* ---------- 7. 钉住轨道（仅桌面 + JS） ---------- */
@media (min-width: 960px) {
  .js .hero {
    padding: 0;
  }
  .js .hero-track {
    position: relative;
    height: 300vh;
  }
  .js .hero-pin {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 5rem 0 3rem;
  }
}

@media (max-height: 780px) and (min-width: 960px) {
  .js .hero-pin {
    padding: 4rem 0 2rem;
  }
  .js .hero-h1 {
    font-size: clamp(2.1rem, 4.6vw, 3.2rem);
  }
  .js .hero-lead {
    margin-bottom: 1.5rem;
    font-size: 1rem;
  }
  .js .hero-meta {
    margin-bottom: 0;
  }
}

/* 减弱动效：撤掉钉住轨道，整页回到普通静态流 */
@media (prefers-reduced-motion: reduce) {
  .js .hero {
    padding: 5.5rem 0 3.5rem;
  }
  .js .hero-track {
    height: auto;
  }
  .js .hero-pin {
    position: static;
    height: auto;
    display: block;
    padding: 0;
  }
  .js .assembly {
    display: none;
  }
}

/* ---------- 8. 零件基座 ---------- */
.piece {
  transform-origin: 50% 50%;
  backface-visibility: hidden;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  .piece {
    transform: none !important;
    opacity: 1 !important;
  }
}

/* ---------- 9. 装配进度 ---------- */
.assembly {
  display: none;
}

@media (min-width: 960px) {
  .js .assembly {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    width: min(100% - 2.5rem, var(--max));
    margin: 0 auto;
    padding-top: 2rem;
  }
}

.assembly-hint {
  flex: 0 0 auto;
  min-width: 10.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--faint);
  transition: opacity 0.35s var(--ease);
}

.assembly-hint.is-hidden {
  opacity: 0;
}

.assembly-rail {
  position: relative;
  flex: 1 1 auto;
  height: 2px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.assembly-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hi));
  transform: scaleX(0);
  transform-origin: 0 50%;
  box-shadow: 0 0 14px -2px var(--accent-ring);
}

.assembly-ticks {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 0 0 auto;
  gap: 0.6rem;
}

.assembly-ticks li {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--faint);
  opacity: 0.32;
  white-space: nowrap;
  transition: opacity 0.4s var(--ease), color 0.4s var(--ease);
}

.assembly-ticks li.on {
  opacity: 1;
  color: var(--accent-text);
}

/* ---------- 10. 舞台与窗口 ---------- */
.hero-stage {
  position: relative;
  perspective: 1500px;
  perspective-origin: 58% 42%;
}

.stage-glow {
  position: absolute;
  /* 横向不外扩：否则会在窄屏制造整页横向滚动。
     filter: blur 的溢出不参与布局，故视觉效果不受影响。 */
  inset: -14% 0;
  background: radial-gradient(ellipse at 46% 44%, var(--accent-soft), transparent 62%);
  filter: blur(28px);
  pointer-events: none;
}

/* 指针磁吸层：JS 写入 transform */
.mock-tilt {
  transform-style: preserve-3d;
  position: relative;
  z-index: 2;
}

.mock {
  position: relative;
  display: grid;
  grid-template-columns: 104px 124px 1fr;
  grid-template-rows: 40px auto;
  transform-style: preserve-3d;
  transform: rotateX(3deg) rotateY(-6deg);
}

@media (max-width: 519px) {
  .mock {
    grid-template-columns: 84px 1fr;
  }
}

.stage-shadow {
  position: absolute;
  left: 12%;
  right: 6%;
  bottom: -48px;
  height: 70px;
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.42), transparent 70%);
  filter: blur(22px);
  pointer-events: none;
}

html[data-theme="light"] .stage-shadow {
  background: radial-gradient(ellipse at center, rgba(20, 22, 34, 0.22), transparent 70%);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .stage-shadow {
    background: radial-gradient(ellipse at center, rgba(20, 22, 34, 0.22), transparent 70%);
  }
}

/* 窗口底板：只负责圆角、外描边与大投影 */
.mock-frame {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--surface-raised), var(--surface));
  border: 1px solid var(--line-2);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2), var(--sh-3);
}

/* 四块面板各自不透明，并各自持有外侧圆角，合成完整窗口 */
.mock-bar {
  grid-area: 1 / 1 / 2 / -1;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 0.9rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.mock-side {
  grid-area: 2 / 1 / -1 / 2;
  z-index: 2;
  padding: 0.8rem 0.65rem;
  background: var(--surface-2);
  border-right: 1px solid var(--line);
  border-radius: 0 0 0 var(--radius-lg);
  font-size: 0.7rem;
  color: var(--muted);
}

.mock-list {
  grid-area: 2 / 2 / -1 / 3;
  z-index: 2;
  padding: 0.8rem 0.65rem;
  background: var(--surface);
  border-right: 1px solid var(--line);
  font-size: 0.73rem;
}

.mock-editor {
  grid-area: 2 / 3 / -1 / -1;
  z-index: 2;
  padding: 0.95rem;
  background: var(--surface);
  border-radius: 0 0 var(--radius-lg) 0;
}

@media (max-width: 519px) {
  .mock-list {
    display: none;
  }
}

.mock-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-2);
}

.mock-title {
  margin-left: 0.5rem;
  font-size: 0.78rem;
  color: var(--faint);
  font-weight: 500;
  font-family: var(--mono);
}

.mock-side .item {
  padding: 0.32rem 0.42rem;
  border-radius: 7px;
  margin-bottom: 0.15rem;
  display: flex;
  align-items: center;
  gap: 0.32rem;
}

.mock-side .item.active {
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 1px 0 var(--hi);
}

.mock-side .item svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.mock-list .note {
  padding: 0.5rem 0.42rem;
  border-radius: 9px;
  margin-bottom: 0.2rem;
  border: 1px solid transparent;
}

.mock-list .note.active {
  background: var(--accent-soft);
  border-color: var(--accent-ring);
}

.mock-list .note strong {
  display: block;
  font-size: 0.78rem;
  margin-bottom: 0.12rem;
}

.mock-list .note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.68rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mock-editor h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: -0.025em;
}

.mock-editor .meta {
  font-size: 0.7rem;
  color: var(--faint);
  margin-bottom: 0.8rem;
  font-family: var(--mono);
}

.mock-editor .line {
  font-size: 0.82rem;
  margin: 0 0 0.4rem;
  color: var(--text);
}

.mock-editor .hl {
  background: rgba(255, 209, 102, 0.4);
  color: inherit;
  border-radius: 3px;
  padding: 0 0.15em;
  box-shadow: 0 0 12px -2px rgba(255, 209, 102, 0.5);
}

html[data-theme="light"] .mock-editor .hl {
  background: rgba(255, 209, 102, 0.75);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .mock-editor .hl {
    background: rgba(255, 209, 102, 0.75);
  }
}

.mock-editor .todo {
  display: flex;
  align-items: center;
  gap: 0.42rem;
  font-size: 0.82rem;
  margin: 0.32rem 0;
}

.mock-editor .todo i {
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--line-2);
  border-radius: 50%;
  flex-shrink: 0;
}

.mock-editor .todo.done {
  color: var(--faint);
  text-decoration: line-through;
}

.mock-editor .todo.done i {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 10px -1px var(--accent-ring);
}

.mock-tags {
  display: flex;
  gap: 0.3rem;
  margin-top: 0.8rem;
  flex-wrap: wrap;
}

.mock-tag {
  font-size: 0.66rem;
  padding: 0.18rem 0.48rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}

/* 悬浮玻璃面板：压在窗口空白处，不遮挡笔记内容 */
.float {
  position: absolute;
  z-index: 4;
  background: var(--surface-glass);
  border: 1px solid var(--line-2);
  border-radius: 14px;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2), var(--sh-3);
  font-size: 0.78rem;
}

.float-search {
  left: -30px;
  bottom: -52px;
  width: 212px;
  padding: 0.7rem 0.8rem;
  animation: float-y 7s ease-in-out infinite alternate;
}

.fs-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.fs-row svg {
  width: 14px;
  height: 14px;
  color: var(--accent-text);
  flex-shrink: 0;
}

.fs-text {
  color: var(--muted);
  flex: 1;
  white-space: nowrap;
}

.fs-hint {
  margin-top: 0.35rem;
  padding-top: 0.35rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.7rem;
  font-family: var(--mono);
}

.float-sync {
  right: -22px;
  bottom: 20%;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.8rem;
  color: var(--muted);
  animation: float-y 9s ease-in-out infinite alternate-reverse;
}

.dot-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34D399;
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
  flex-shrink: 0;
}

.fs-time {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.7rem;
}

@keyframes float-y {
  from { translate: 0 0; }
  to   { translate: 0 -12px; }
}

@media (max-width: 1179px) {
  .float-search { left: -10px; bottom: -44px; width: 186px; }
  .float-sync { right: -6px; }
}

@media (max-width: 959px) {
  .hero-stage {
    perspective: none;
  }
  .mock {
    transform: none;
  }
  .float-search,
  .float-sync,
  .mock-stack-back,
  .stage-shadow {
    display: none;
  }
}
/* ---------- 11. 区块通用 ---------- */
section {
  padding: 4.5rem 0;
}

.section-head {
  text-align: center;
  max-width: 38rem;
  margin: 0 auto 3rem;
}

.sec-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

.sec-label i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.6vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
  font-weight: 700;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

/* ---------- 12. 卡片 ---------- */
.feature-grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .feature-grid.feature-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1120px) {
  .feature-grid.feature-grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  position: relative;
  isolation: isolate;
  background: var(--surface-glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem 1.55rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1), var(--sh-2);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card-glow {
  position: absolute;
  inset: -1px;
  z-index: -1;
  border-radius: inherit;
  opacity: 0;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 0%), var(--accent-soft), transparent 62%);
  transition: opacity 0.3s var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-ring);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2), var(--sh-3), var(--sh-glow);
}

.card:hover .card-glow {
  opacity: 1;
}

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: linear-gradient(160deg, var(--accent-soft), transparent 70%);
  border: 1px solid var(--accent-ring);
  color: var(--accent-text);
  display: grid;
  place-items: center;
  margin-bottom: 1.05rem;
  box-shadow: inset 0 1px 0 var(--hi);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card:hover .card-icon {
  transform: translateY(-2px) scale(1.04);
  box-shadow: inset 0 1px 0 var(--hi), 0 8px 20px -8px var(--accent-ring);
}

.card-icon svg {
  width: 20px;
  height: 20px;
}

.card h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: -0.025em;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ---------- 13. 桌面版 band ---------- */
.band {
  position: relative;
  background: var(--surface-glass);
  border-block: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 100% at 78% 50%, var(--accent-soft), transparent 62%);
  pointer-events: none;
}

.band .wrap {
  position: relative;
}

.band-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

/* band 里的补充说明（跨平台提示等） */
.band-note {
  margin: 1.4rem 0 0;
  padding-top: 1.05rem;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted);
}

.band-note strong { color: var(--text); }

@media (min-width: 900px) {
  .band-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
  }
}

.band h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.band p {
  margin: 0 0 1.35rem;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
}

.checklist li svg {
  width: 18px;
  height: 18px;
  color: var(--accent-text);
  flex-shrink: 0;
  margin-top: 0.12rem;
  filter: drop-shadow(0 0 8px var(--accent-ring));
}

.kbd-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.kbd {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.32rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--line-2);
  background: var(--surface-2);
  box-shadow: inset 0 1px 0 var(--hi), 0 2px 0 var(--line);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--mono);
  color: var(--text);
}

.desktop-card {
  position: relative;
  isolation: isolate;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2), var(--sh-3);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.desktop-card:hover {
  transform: translateY(-4px);
}

.desktop-card .row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}

.desktop-card .row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.desktop-card .row:first-child {
  padding-top: 0;
}

.desktop-card .ico {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(160deg, var(--accent-soft), transparent 70%);
  border: 1px solid var(--accent-ring);
  color: var(--accent-text);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  box-shadow: inset 0 1px 0 var(--hi);
}

.desktop-card .ico svg {
  width: 18px;
  height: 18px;
}

.desktop-card strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.12rem;
}

.desktop-card span {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- 14. 能力条 ---------- */
#more {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.cap-rail {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 56rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2);
}

@media (min-width: 760px) {
  .cap-rail {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 980px) {
  .cap-rail {
    grid-template-columns: repeat(6, 1fr);
  }
}

.cap-rail li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.15rem 0.9rem;
  font-size: 0.92rem;
  color: var(--text);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease);
}

.cap-rail li:hover {
  background: var(--accent-soft);
}

.cap-rail li:nth-child(2n) { border-right: none; }
.cap-rail li:nth-last-child(-n + 2) { border-bottom: none; }

@media (min-width: 760px) {
  .cap-rail li:nth-child(2n) { border-right: 1px solid var(--line); }
  .cap-rail li:nth-child(3n) { border-right: none; }
  .cap-rail li:nth-last-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .cap-rail li:nth-last-child(-n + 3) { border-bottom: none; }
}

@media (min-width: 980px) {
  .cap-rail li:nth-child(3n) { border-right: 1px solid var(--line); }
  .cap-rail li:nth-last-child(-n + 3) { border-bottom: 1px solid var(--line); }
  .cap-rail li { border-bottom: none; }
  .cap-rail li:last-child { border-right: none; }
}

.cap-idx {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent-text);
  opacity: 0.85;
}

/* ---------- 15. 下载区 ---------- */
.download {
  padding: 5rem 0;
}

.download-box {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--accent-ring);
  background: var(--surface);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-2), var(--sh-3), var(--sh-glow);
}

.dl-aurora {
  position: absolute;
  inset: -50%;
  z-index: -1;
  background:
    radial-gradient(ellipse 45% 40% at 30% 35%, var(--accent-soft), transparent 62%),
    radial-gradient(ellipse 40% 45% at 72% 62%, rgba(76, 111, 255, 0.16), transparent 64%);
  animation: dl-spin 22s linear infinite;
}

html[data-theme="light"] .dl-aurora {
  background:
    radial-gradient(ellipse 45% 40% at 30% 35%, var(--accent-soft), transparent 62%),
    radial-gradient(ellipse 40% 45% at 72% 62%, rgba(76, 111, 255, 0.1), transparent 64%);
}

@keyframes dl-spin {
  from { transform: rotate(0deg) scale(1); }
  to   { transform: rotate(360deg) scale(1.06); }
}

.dl-content {
  position: relative;
  text-align: center;
  padding: clamp(2.25rem, 5.5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}

.download-box h2 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.045em;
}

.download-box p {
  margin: 0 auto 2rem;
  color: var(--muted);
  max-width: 34rem;
  font-size: 1.02rem;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
}

.download-note {
  margin-top: 1.4rem !important;
  font-size: 0.83rem;
  color: var(--faint);
}

.download-note a {
  color: var(--accent-text);
  font-weight: 600;
}

.download-note a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 双平台下载卡片 */
.dl-platforms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  max-width: 52rem;
  margin: 0 auto 1.35rem;
  text-align: left;
}

.dl-platform {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 1.25rem 1.3rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
}

.dl-platform-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.dl-platform-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.dl-platform-meta {
  margin: 0.15rem 0 0 !important;
  font-size: 0.8rem !important;
  color: var(--faint) !important;
  max-width: none !important;
}

.dl-os {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.75rem;
  background: var(--accent-soft);
  color: var(--accent-text);
  box-shadow: inset 0 1px 0 var(--hi);
}

.dl-os svg {
  width: 1.15rem;
  height: 1.15rem;
}

.dl-platform .btn {
  width: 100%;
  justify-content: center;
}

.dl-platform-tip {
  margin: 0 !important;
  font-size: 0.8rem !important;
  color: var(--muted) !important;
  max-width: none !important;
  line-height: 1.55;
}


.download-actions-web {
  margin-top: 0.15rem;
}

@media (max-width: 720px) {
  .dl-platforms {
    grid-template-columns: 1fr;
  }
}

/* Windows SmartScreen 提示 */
.download-callout {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  max-width: 44rem;
  margin: 1.15rem auto 0;
  padding: 0.8rem 1.05rem;
  border: 1px solid var(--accent-ring);
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.65;
  text-align: left;
}

.download-callout svg {
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--accent-text);
}

.download-callout strong { color: var(--accent-text); }

/* ---------- 16. 安装说明 ---------- */
.install {
  padding: 3rem 0 5.5rem;
}

/* ---------- 平台切换（macOS / Windows） ---------- */
.install-tabs {
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  width: fit-content;
  margin: 0 auto 2.4rem;
  padding: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.install-tab {
  padding: 0.52rem 1.3rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.install-tab:hover { color: var(--text); }

.install-tab.is-active {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--sh-glow);
}

.install-tab:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

.install-panel[hidden] { display: none; }

.install-steps {
  list-style: none;
  margin: 0 auto 1.25rem;
  padding: 0;
  max-width: 740px;
  display: grid;
  /* minmax(0,1fr) 而非 auto：auto 轨道会被内容最小宽度撑破容器，
     导致整页出现横向滚动 */
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7rem;
  counter-reset: step;
}

.install-step {
  position: relative;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  min-width: 0;
  background: var(--surface-glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem 1.2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 var(--hi), var(--sh-1);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.install-step:hover {
  border-color: var(--line-2);
  transform: translateX(3px);
}

.step-num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-ring);
  color: var(--accent-text);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.8rem;
  display: grid;
  place-items: center;
  box-shadow: inset 0 1px 0 var(--hi);
}

.step-body {
  /* flex 子项默认 min-width:auto，会被超长命令行撑破容器，
     必须归零，交由 .code-block 自己横向滚动 */
  min-width: 0;
}

.step-body h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.01rem;
  letter-spacing: -0.025em;
}

.step-body p {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.68;
}

.step-body p:last-child {
  margin-bottom: 0;
}

.step-note {
  font-size: 0.87rem !important;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--muted);
  box-shadow: inset 0 1px 0 var(--hi);
}

.inline-code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  border-radius: 5px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.install-aside {
  max-width: 740px;
  margin: 0 auto;
  background: var(--surface-glass);
  border: 1px dashed var(--accent-ring);
  border-radius: var(--radius);
  padding: 1.3rem 1.35rem 1.4rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.install-aside h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1rem;
}

.install-aside > p {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.code-block {
  margin: 0.65rem 0 0.8rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.14);
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.5;
}

html[data-theme="light"] .code-block {
  box-shadow: inset 0 2px 6px rgba(20, 22, 34, 0.06);
}

.code-block code {
  font-family: var(--mono);
  color: var(--text);
  white-space: pre;
}

.code-prompt {
  color: var(--accent-text);
  margin-right: 0.55rem;
  user-select: none;
}

.install .kbd {
  vertical-align: middle;
}

/* ---------- 17. 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 2.5rem 0 2.25rem;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding-bottom: 1.75rem;
}

.footer-tag {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  flex: 1;
  min-width: 160px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.footer-links a {
  transition: color 0.2s var(--ease);
}

.footer-links a:hover {
  color: var(--accent-text);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.8rem;
}

.footer-mono {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.footer-beian {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.footer-beian:hover {
  color: var(--muted);
}

/* ---------- 18. 进场动效 ---------- */
/* 仅在 .js 存在时隐藏元素：禁用 JS 时内容必须照常可见 */
.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease) var(--d, 0ms), transform 0.7s var(--ease) var(--d, 0ms);
}

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

/* 兜底：若 IntersectionObserver 未能触发，2.5s 后直接显示，绝不留白 */
.js.reveal-timeout .reveal {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 860px) {
  .hero {
    padding: 3.5rem 0 3rem;
  }
  .band-copy {
    order: -1;
  }
}

@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-actions .btn-secondary { display: none; }
  section { padding: 3.25rem 0; }
  .hero-h1 { letter-spacing: -0.04em; }
  .footer-top { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .wrap { width: min(100% - 2rem, var(--max)); }
  .hero-meta { gap: 0.5rem 1rem; font-size: 0.82rem; }
  .btn-lg { padding: 0.85rem 1.15rem; font-size: 0.94rem; }
}

/* ---------- 20. 品牌开场 ---------- */
.intro {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: #05060a;
  display: grid;
  place-items: center;
  overflow: hidden;
  transition: opacity 0.7s ease;
}

.intro.is-out {
  opacity: 0;
  pointer-events: none;
}

.intro-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.intro-skip {
  position: absolute;
  right: 1.4rem;
  bottom: 1.4rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(10, 12, 18, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: rgba(233, 236, 243, 0.82);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, border-color 0.2s ease, color 0.2s ease;
}

.intro-skip.is-ready {
  opacity: 1;
  pointer-events: auto;
}

.intro-skip:hover {
  border-color: rgba(249, 115, 22, 0.6);
  color: #fff;
}

.intro-skip:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

/* 开场期间锁住页面滚动 */
html.intro-lock,
html.intro-lock body {
  overflow: hidden;
}

/* 竖屏完整呈现 16:9 画面，避免裁掉字标 */
@media (orientation: portrait) {
  .intro-video { object-fit: contain; }
}

/* 减少动效：直接进入页面 */
@media (prefers-reduced-motion: reduce) {
  .intro { display: none; }
}