/* ============================================================
   未来玻璃 (Future Glass)  设计系统
   原生 CSS, 无框架依赖
   深靛蓝宇宙 / 毛玻璃卡片 / 紫罗兰到霓虹粉渐变
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 主色 */
  --violet: #7C3AED;
  --pink:   #EC4899;
  --cyan:   #06B6D4;

  /* 渐变 */
  --grad:      linear-gradient(120deg, #7C3AED 0%, #EC4899 100%);
  --grad-soft: linear-gradient(120deg, rgba(124,58,237,.18) 0%, rgba(236,72,153,.18) 100%);
  --grad-text: linear-gradient(110deg, #A78BFA 0%, #EC4899 55%, #F472B6 100%);

  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo,
               Consolas, 'Liberation Mono', monospace;

  /* 圆角 (单一体系) */
  --r-sm: 10px;
  --r:    16px;
  --r-lg: 22px;
  --r-pill: 999px;

  /* 间距节奏 */
  --sp-1: 6px;  --sp-2: 12px; --sp-3: 18px;
  --sp-4: 24px; --sp-5: 36px; --sp-6: 56px;
  --sp-7: 80px; --sp-8: 120px;

  /* 动效 */
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --dur: .55s;
}

/* ---------- 2. 暗色主题 (默认) ---------- */
:root,
[data-theme="dark"] {
  --bg:            #0A0B1A;
  --text:          #F8FAFC;
  --text-dim:      rgba(248, 250, 252, .66);
  --text-mute:     rgba(248, 250, 252, .42);
  --surface:       rgba(255, 255, 255, .05);
  --surface-hover: rgba(255, 255, 255, .08);
  --surface-solid: rgba(255, 255, 255, .03);
  --hairline:      rgba(255, 255, 255, .12);
  --hairline-soft: rgba(255, 255, 255, .07);
  --field-bg:      rgba(255, 255, 255, .04);
  --ring:          rgba(124, 58, 237, .45);
  --danger:        #FB7185;
  --success:       #34D399;
  --warning:       #FBBF24;
  --shadow-card:   0 18px 50px -20px rgba(0, 0, 0, .75);
  --shadow-float:  0 34px 80px -30px rgba(124, 58, 237, .55);
  color-scheme: dark;
}

/* ---------- 3. 亮色主题 ---------- */
[data-theme="light"] {
  --bg:            #F4F5FB;
  --text:          #131433;
  --text-dim:      rgba(19, 20, 51, .70);
  --text-mute:     rgba(19, 20, 51, .48);
  --surface:       rgba(255, 255, 255, .72);
  --surface-hover: rgba(255, 255, 255, .92);
  --surface-solid: #FFFFFF;
  --hairline:      rgba(19, 20, 51, .10);
  --hairline-soft: rgba(19, 20, 51, .06);
  --field-bg:      rgba(255, 255, 255, .80);
  --ring:          rgba(124, 58, 237, .35);
  --danger:        #E11D48;
  --success:       #059669;
  --warning:       #D97706;
  --shadow-card:   0 16px 44px -22px rgba(19, 20, 51, .28);
  --shadow-float:  0 30px 70px -30px rgba(124, 58, 237, .32);
  color-scheme: light;
}

/* ---------- 4. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1100px 620px at 8% -8%,  rgba(124, 58, 237, .30), transparent 62%),
    radial-gradient(900px  520px at 92% 2%,  rgba(236, 72, 153, .20), transparent 60%),
    radial-gradient(820px  620px at 62% 108%, rgba(6, 182, 212, .14), transparent 62%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .4s var(--ease-out), color .4s var(--ease-out);
}

[data-theme="light"] body {
  background-image:
    radial-gradient(1100px 620px at 8% -8%,  rgba(124, 58, 237, .16), transparent 62%),
    radial-gradient(900px  520px at 92% 2%,  rgba(236, 72, 153, .12), transparent 60%),
    radial-gradient(820px  620px at 62% 108%, rgba(6, 182, 212, .12), transparent 62%);
}

h1, h2, h3, h4 { margin: 0; font-weight: 650; letter-spacing: -.02em; line-height: 1.2; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }

/* 星野刻度背景 (纯 CSS, 无图片) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(1.4px 1.4px at 20% 22%, rgba(248,250,252,.55), transparent),
    radial-gradient(1.2px 1.2px at 72% 18%, rgba(248,250,252,.45), transparent),
    radial-gradient(1.6px 1.6px at 46% 62%, rgba(167,139,250,.50), transparent),
    radial-gradient(1.2px 1.2px at 86% 72%, rgba(236,72,153,.42), transparent),
    radial-gradient(1.1px 1.1px at 12% 82%, rgba(6,182,212,.40), transparent);
  opacity: .85;
  animation: star-drift 26s var(--ease-out) infinite alternate;
}
[data-theme="light"] body::before { opacity: .28; }

@keyframes star-drift {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-14px, 10px, 0); }
}

/* ---------- 5. 布局骨架 ---------- */
.shell { position: relative; z-index: 1; display: flex; flex-direction: column; min-height: 100vh; }
.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 var(--sp-4); }
.container-narrow { max-width: 880px; }
.main { flex: 1; }

/* ---------- 6. 固定毛玻璃导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 66px;
  display: flex;
  align-items: center;
  background: var(--surface-solid);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  border-bottom: 1px solid var(--hairline-soft);
  transition: background .35s var(--ease-out), border-color .35s var(--ease-out);
}
[data-theme="dark"] .nav { background: rgba(10, 11, 26, .68); }
.nav.scrolled { border-bottom-color: var(--hairline); box-shadow: 0 8px 32px -18px rgba(0,0,0,.6); }

.nav-inner { display: flex; align-items: center; gap: var(--sp-4); width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 var(--sp-4); }
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 650; letter-spacing: -.02em; }
.nav-logo {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--grad);
  display: grid; place-items: center;
  box-shadow: 0 8px 22px -8px rgba(124, 58, 237, .8);
  flex: none;
}
.nav-links { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav-link {
  padding: 8px 14px; border-radius: var(--r-pill);
  font-size: 14px; color: var(--text-dim);
  transition: color .25s var(--ease-out), background-color .25s var(--ease-out);
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-link.active { color: var(--text); background: var(--surface); }

/* 主题切换开关 */
.theme-toggle {
  width: 62px; height: 32px; flex: none;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline);
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative; cursor: pointer;
  transition: transform .3s var(--ease-out), border-color .3s var(--ease-out);
}
.theme-toggle:hover { transform: translateY(-1px); border-color: var(--hairline); }
.theme-toggle::after {
  content: "";
  position: absolute; top: 3px; left: 3px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 4px 12px -2px rgba(124, 58, 237, .7);
  transition: transform .38s var(--ease-out);
}
[data-theme="light"] .theme-toggle::after { transform: translateX(30px); background: linear-gradient(120deg, #FBBF24, #F59E0B); }
.theme-toggle .ico { position: absolute; top: 50%; transform: translateY(-50%); z-index: 1; opacity: .9; }
.theme-toggle .ico-moon { right: 8px; }
.theme-toggle .ico-sun  { left: 8px; }

.has-nav .main { padding-top: 66px; }

/* ---------- 7. 玻璃卡片 ---------- */
.glass {
  position: relative;
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
}

.card {
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  box-shadow: var(--shadow-card);
}
.card-hover { transition: transform .45s var(--ease-out), border-color .45s var(--ease-out), box-shadow .45s var(--ease-out); }
.card-hover:hover { transform: translateY(-6px); border-color: rgba(167,139,250,.45); box-shadow: var(--shadow-float); }

.card-title { font-size: 17px; font-weight: 650; letter-spacing: -.01em; }
.card-desc  { color: var(--text-dim); font-size: 14px; margin-top: 6px; }

/* ---------- 8. Hero ---------- */
.hero { position: relative; padding: clamp(72px, 12vh, 132px) 0 var(--sp-7); text-align: center; overflow: hidden; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px 7px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .04em;
  color: var(--text-dim);
}
.hero-tag .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(6,182,212,.18); }

.hero h1 {
  margin: var(--sp-4) auto 0;
  max-width: 16em;
  font-size: clamp(38px, 6.2vw, 76px);
  font-weight: 720;
  letter-spacing: -.035em;
  line-height: 1.06;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  margin: var(--sp-4) auto 0; max-width: 44em;
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--text-dim); line-height: 1.75;
}
.hero-cta { margin-top: var(--sp-5); display: flex; gap: var(--sp-2); justify-content: center; flex-wrap: wrap; }

/* CSS 3D 透视 mockup */
.stage {
  margin: clamp(48px, 8vh, 84px) auto 0;
  max-width: 960px;
  perspective: 1600px;
  perspective-origin: 50% 40%;
}
.stage-scene {
  transform: rotateX(15deg) rotateY(-8deg) rotateZ(1.2deg);
  transform-style: preserve-3d;
  transition: transform .8s var(--ease-out);
  animation: mockup-float 12s ease-in-out infinite alternate;
}
.stage:hover .stage-scene { transform: rotateX(8deg) rotateY(-3deg) rotateZ(.6deg) translateY(-6px); }
@keyframes mockup-float {
  from { transform: rotateX(15deg) rotateY(-8deg) translateY(0); }
  to   { transform: rotateX(12deg) rotateY(-4deg) translateY(-14px); }
}
.mockup {
  border-radius: var(--r-lg);
  background: var(--surface-solid);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
[data-theme="dark"] .mockup { background: rgba(255,255,255,.045); }
.mockup-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--hairline-soft);
}
.mockup-bar i { width: 10px; height: 10px; border-radius: 50%; display: block; }
.mockup-bar i:nth-child(1) { background: #EC4899; }
.mockup-bar i:nth-child(2) { background: #FBBF24; }
.mockup-bar i:nth-child(3) { background: #06B6D4; }
.mockup-bar span {
  margin-left: 10px; font-family: var(--font-mono);
  font-size: 11.5px; color: var(--text-mute);
}
.mockup-body { padding: var(--sp-4); display: grid; gap: 12px; }
.mockup-row { display: grid; grid-template-columns: repeat(12, 1fr); gap: 10px; }
.mockup-cell {
  height: 12px; border-radius: 6px;
  background: linear-gradient(90deg, rgba(124,58,237,.30), rgba(236,72,153,.22));
}
.mockup-cell.a { background: linear-gradient(90deg, rgba(6,182,212,.34), rgba(124,58,237,.20)); }
.mockup-panel {
  border: 1px solid var(--hairline-soft); border-radius: var(--r);
  padding: 14px; background: var(--surface);
}
.mockup-panel h4 { font-size: 12.5px; font-family: var(--font-mono); color: var(--text-mute); font-weight: 500; letter-spacing: .04em; }
.mockup-num { font-size: 26px; font-weight: 680; letter-spacing: -.02em; margin-top: 6px; }
.mockup-num.v { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 9. 特性网格 3x3 ---------- */
.section { padding: var(--sp-7) 0; }
.section-head { text-align: center; max-width: 42em; margin: 0 auto var(--sp-6); }
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 42px); font-weight: 700; letter-spacing: -.03em;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.section-head p { margin-top: var(--sp-2); color: var(--text-dim); font-size: 15.5px; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}
.feature {
  padding: var(--sp-4);
  border-radius: var(--r-lg);
  background: var(--surface);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  transition: transform .5s var(--ease-out), border-color .5s var(--ease-out), box-shadow .5s var(--ease-out);
}
.feature:hover { transform: translateY(-7px); box-shadow: var(--shadow-float); border-color: rgba(167,139,250,.4); }

.feature-icon {
  width: 44px; height: 44px; border-radius: 13px;
  display: grid; place-items: center;
  margin-bottom: var(--sp-3);
  border: 1px solid var(--hairline);
  background: var(--surface-solid);
}
/* 图标循环 紫 / 粉 / 青 */
.feature:nth-child(3n+1) .feature-icon { color: #A78BFA; box-shadow: inset 0 0 0 1px rgba(167,139,250,.22), 0 8px 20px -10px rgba(124,58,237,.6); }
.feature:nth-child(3n+2) .feature-icon { color: #F472B6; box-shadow: inset 0 0 0 1px rgba(244,114,182,.22), 0 8px 20px -10px rgba(236,72,153,.6); }
.feature:nth-child(3n+3) .feature-icon { color: #22D3EE; box-shadow: inset 0 0 0 1px rgba(34,211,238,.22), 0 8px 20px -10px rgba(6,182,212,.6); }
.feature h3 { font-size: 16.5px; font-weight: 640; }
.feature p  { margin-top: 8px; color: var(--text-dim); font-size: 14px; line-height: 1.7; }

/* ---------- 10. 入场动画 (IntersectionObserver 添加 .in) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  will-change: transform, opacity;
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- 11. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 14.5px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out),
              background-color .3s var(--ease-out), border-color .3s var(--ease-out), opacity .3s var(--ease-out);
}
.btn:active { transform: scale(.97); }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 12px 30px -10px rgba(124, 58, 237, .75);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -12px rgba(236, 72, 153, .7); }
.btn-primary[disabled] { opacity: .55; box-shadow: none; transform: none; cursor: not-allowed; }

.btn-ghost {
  background: var(--surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: var(--hairline);
  color: var(--text);
}
.btn-ghost:hover { background: var(--surface-hover); transform: translateY(-2px); }

.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-block { width: 100%; }
.btn-danger { background: rgba(251,113,133,.14); border-color: rgba(251,113,133,.35); color: var(--danger); }
.btn-danger:hover { background: rgba(251,113,133,.22); }

/* ---------- 12. 表单 ---------- */
.field { margin-bottom: var(--sp-3); }
.label {
  display: block; margin-bottom: 7px;
  font-size: 13px; font-weight: 560; color: var(--text-dim);
  letter-spacing: -.005em;
}
.label .req { color: var(--pink); }

.input, .select, .textarea {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--r);
  border: 1px solid var(--hairline);
  background: var(--field-bg);
  color: var(--text);
  font-size: 14.5px;
  outline: none;
  transition: border-color .25s var(--ease-out), box-shadow .25s var(--ease-out), background-color .25s var(--ease-out);
}
.input::placeholder, .textarea::placeholder { color: var(--text-mute); }
.input:focus, .select:focus, .textarea:focus {
  border-color: rgba(167,139,250,.6);
  box-shadow: 0 0 0 4px var(--ring);
}
.select { appearance: none; -webkit-appearance: none; padding-right: 38px;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 13px center;
}
[data-theme="dark"] .select option { background: #14152E; color: #F8FAFC; }
.textarea { min-height: 88px; resize: vertical; }

.input-group { display: flex; gap: 8px; }
.input-group .input { flex: 1; }
.input-group .btn { flex: none; }

.check { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; font-size: 14px; }
.check input { width: 16px; height: 16px; accent-color: var(--violet); cursor: pointer; }

.hint { margin-top: 6px; font-size: 12.5px; color: var(--text-mute); }
.error-text { margin-top: 6px; font-size: 12.5px; color: var(--danger); }

/* ---------- 13. 表格 ---------- */
.table-wrap {
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: var(--surface);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  overflow: auto;
  box-shadow: var(--shadow-card);
}
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--hairline-soft); white-space: nowrap; }
.table th {
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  color: var(--text-mute); text-transform: uppercase;
  font-family: var(--font-mono);
  position: sticky; top: 0;
  background: var(--surface-solid);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  z-index: 2;
}
[data-theme="dark"] .table th { background: rgba(16,17,38,.92); }
.table tbody tr { transition: background-color .22s var(--ease-out); }
.table tbody tr:hover { background: var(--surface-hover); }
.table tbody tr:last-child td { border-bottom: none; }
.table .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.empty { padding: var(--sp-6) var(--sp-4); text-align: center; color: var(--text-mute); }
.empty svg { margin: 0 auto var(--sp-2); opacity: .5; }

/* ---------- 14. 徽标 / 提示 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px; border-radius: var(--r-pill);
  font-size: 12px; font-weight: 560;
  border: 1px solid var(--hairline);
  background: var(--surface);
  color: var(--text-dim);
}
.badge-ok      { color: var(--success); border-color: rgba(52,211,153,.32); background: rgba(52,211,153,.12); }
.badge-warn    { color: var(--warning); border-color: rgba(251,191,36,.32); background: rgba(251,191,36,.12); }
.badge-danger  { color: var(--danger);  border-color: rgba(251,113,133,.32); background: rgba(251,113,133,.12); }
.badge-violet  { color: #A78BFA; border-color: rgba(167,139,250,.32); background: rgba(167,139,250,.12); }
.badge-pink    { color: #F472B6; border-color: rgba(244,114,182,.32); background: rgba(244,114,182,.12); }
.badge-cyan    { color: #22D3EE; border-color: rgba(34,211,238,.32); background: rgba(34,211,238,.12); }

.alert {
  padding: 13px 16px; border-radius: var(--r);
  border: 1px solid var(--hairline);
  background: var(--surface);
  font-size: 14px; margin-bottom: var(--sp-3);
  display: flex; gap: 10px; align-items: flex-start;
}
.alert svg { flex: none; margin-top: 2px; }
.alert-error   { color: var(--danger);  border-color: rgba(251,113,133,.3); background: rgba(251,113,133,.10); }
.alert-success { color: var(--success); border-color: rgba(52,211,153,.3); background: rgba(52,211,153,.10); }
.alert-info    { color: var(--cyan);    border-color: rgba(34,211,238,.3); background: rgba(34,211,238,.10); }

/* ---------- 15. 统计卡 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: var(--sp-3); }
.stat {
  padding: var(--sp-4); border-radius: var(--r-lg);
  background: var(--surface);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  transition: transform .45s var(--ease-out), box-shadow .45s var(--ease-out);
}
.stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-float); }
.stat-label { font-size: 12.5px; color: var(--text-mute); font-family: var(--font-mono); letter-spacing: .04em; }
.stat-value {
  margin-top: 8px; font-size: 32px; font-weight: 700; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-sub { margin-top: 4px; font-size: 12.5px; color: var(--text-mute); }

/* ---------- 16. 页脚 ---------- */
.footer {
  margin-top: var(--sp-8);
  padding: var(--sp-5) 0 var(--sp-4);
  border-top: 1px solid var(--hairline-soft);
  color: var(--text-mute); font-size: 13px;
}
.footer-inner { display: flex; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap; align-items: center; }
.footer .mono { font-family: var(--font-mono); font-size: 12px; letter-spacing: .03em; }

/* ---------- 17. 认证页 (居中玻璃) ---------- */
.auth-wrap {
  min-height: 100vh;
  display: grid; place-items: center;
  padding: var(--sp-6) var(--sp-4);
}
.auth-card {
  width: 100%; max-width: 440px;
  padding: var(--sp-5);
  border-radius: var(--r-lg);
  background: var(--surface);
  backdrop-filter: blur(26px) saturate(180%);
  -webkit-backdrop-filter: blur(26px) saturate(180%);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-float);
}
.auth-title { font-size: 26px; font-weight: 700; letter-spacing: -.03em; }
.auth-sub   { margin-top: 6px; color: var(--text-dim); font-size: 14px; }
.auth-links { margin-top: var(--sp-3); display: flex; justify-content: space-between; font-size: 13.5px; gap: 8px; flex-wrap: wrap; }
.auth-links a { color: var(--text-dim); transition: color .25s var(--ease-out); }
.auth-links a:hover { color: var(--text); }

/* 倒计时按钮 */
.countdown { font-variant-numeric: tabular-nums; font-family: var(--font-mono); }

/* ---------- 18. 工具类 ---------- */
.row { display: flex; gap: var(--sp-2); align-items: center; flex-wrap: wrap; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.col { display: flex; flex-direction: column; gap: var(--sp-2); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-3); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-2); }
.grow { flex: 1; }
.mt-1 { margin-top: var(--sp-1); } .mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); } .mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); } .mt-6 { margin-top: var(--sp-6); }
.mb-2 { margin-bottom: var(--sp-2); } .mb-3 { margin-bottom: var(--sp-3); }
.mb-4 { margin-bottom: var(--sp-4); }
.text-dim { color: var(--text-dim); }
.text-mute { color: var(--text-mute); }
.text-sm { font-size: 13.5px; }
.mono { font-family: var(--font-mono); }
.grad-text { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.center { text-align: center; }
.nowrap { white-space: nowrap; }

/* ---------- 19. 响应式 ---------- */
@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stage-scene { transform: rotateX(9deg) rotateY(-4deg); }
}
@media (max-width: 720px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .nav-links .hide-sm { display: none; }
  .container { padding: 0 var(--sp-3); }
  .card { padding: var(--sp-4); }
  .hero { padding-top: 84px; }
  [data-theme="light"] body::before { opacity: .2; }
}

/* ---------- 20. 无障碍: 减少动态效果塌缩为静态 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .stage-scene { transform: none !important; animation: none !important; }
  body::before { animation: none !important; }
  .card-hover:hover, .feature:hover, .btn-primary:hover, .btn-ghost:hover, .stat:hover {
    transform: none !important;
  }
}

/* 焦点可见性 */
:focus-visible { outline: 2px solid var(--violet); outline-offset: 2px; }

/* ---------- 21. 套打打印 (A4 精确排版) ---------- */
@media print {
  @page { size: A4 portrait; margin: 12mm 10mm; }
  body { background: #fff !important; color: #000 !important; }
  body::before, .nav, .footer, .no-print, .print-bar { display: none !important; }
  .print-sheet {
    width: 190mm; margin: 0 auto; border: none !important;
    box-shadow: none !important; backdrop-filter: none !important;
    background: #fff !important; color: #000 !important;
    border-radius: 0 !important;
  }
  .print-sheet * { color: #000 !important; border-color: #333 !important; }
  .print-grid { display: table !important; width: 100%; border-collapse: collapse; }
  .print-field { border: 1px solid #555 !important; padding: 1.6mm 2mm !important; }
  .print-row { display: table-row !important; }
  .print-cell { display: table-cell !important; }
  .sig img { filter: grayscale(1) contrast(1.4); }
  .avoid-break { break-inside: avoid; }
}