/* DuckCut 官网样式 —— 深色、克制、以界面本身为主角 */

:root {
  --bg: #080b12;
  --bg-soft: #0c111a;
  --panel: #111825;
  --panel-2: #0e1420;
  --line: #222c40;
  --line-soft: #1a2233;
  --text: #e9eefb;
  --muted: #98a4be;
  --muted-2: #6f7c96;
  --accent: #6d7dff;
  --accent-2: #9aa6ff;
  --mint: #4fd6a8;
  --amber: #ffb454;
  --danger: #ff6b70;
  --radius: 18px;
  --wrap: 1240px;
  --shadow: 0 24px 70px rgba(3, 6, 14, 0.55);
  --font: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI",
    system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 背景光晕 */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 78vh;
  background:
    radial-gradient(46% 52% at 22% 26%, rgba(109, 125, 255, 0.18), transparent 70%),
    radial-gradient(38% 46% at 78% 12%, rgba(79, 214, 168, 0.1), transparent 72%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}

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

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: #c3cbff; }

h1, h2, h3 { line-height: 1.22; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(38px, 5.4vw, 62px); font-weight: 800; }
h2 { font-size: clamp(30px, 3.6vw, 46px); font-weight: 750; }
h3 { font-size: 19px; font-weight: 700; }
p { margin: 0; }

kbd {
  display: inline-block;
  min-width: 26px;
  padding: 1px 7px;
  border-radius: 6px;
  border: 1px solid #33405c;
  border-bottom-width: 2px;
  background: #1a2336;
  color: #dbe4ff;
  font-family: var(--font);
  font-size: 0.85em;
  line-height: 1.5;
  text-align: center;
}

code { font-family: var(--mono); font-size: 0.9em; color: #cdd7f5; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  z-index: 99;
}
.skip:focus { left: 12px; top: 12px; }

.wrap { width: min(var(--wrap), calc(100% - 48px)); margin: 0 auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 11px;
  border: 1px solid transparent;
  font-weight: 650;
  font-size: 15.5px;
  padding: 11px 20px;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease,
    box-shadow 0.16s ease, color 0.16s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary {
  background: linear-gradient(180deg, #7d8cff, #5b6bf0);
  color: #fff;
  box-shadow: 0 10px 26px rgba(88, 104, 255, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 14px 32px rgba(88, 104, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25); }
.btn-ghost { background: rgba(255, 255, 255, 0.03); border-color: #2c3750; color: #d8e0f7; }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.07); border-color: #3d4a6b; color: #fff; }
.btn-lg { padding: 14px 26px; font-size: 16.5px; border-radius: 12px; }
.btn-sm { padding: 8px 16px; font-size: 14.5px; }
.btn-xs { padding: 4px 10px; font-size: 12.5px; border-radius: 7px; }

/* ---------- 导航 ---------- */
/* 导航：透明磨砂玻璃，和页面内容融在一起而不是压一条黑杠
   磨砂层向下多铺 30px 并用遮罩渐隐，避免底边切出一道生硬的接缝 */
.nav {
  position: sticky;
  top: 0;
  z-index: 30;
}
.nav::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: -30px;
  z-index: -1;
  background: rgba(9, 13, 21, 0.42);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 58%, rgba(0, 0, 0, 0.55) 82%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, #000 58%, rgba(0, 0, 0, 0.55) 82%, transparent 100%);
  transition: background 0.3s ease;
  pointer-events: none;
}
.nav.is-scrolled::before { background: rgba(9, 13, 21, 0.66); }
.nav-inner { display: flex; align-items: center; gap: 26px; height: 72px; }
.brand { display: flex; align-items: center; gap: 11px; color: var(--text); }
.brand img { border-radius: 9px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; font-weight: 750; font-size: 18px; letter-spacing: 0.01em; }
.brand-text em { font-style: normal; font-weight: 500; font-size: 11.5px; letter-spacing: 0.16em; color: var(--muted-2); text-transform: uppercase; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--muted);
  font-size: 15px;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav-cta { margin-left: 4px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  margin-left: auto;
  border-radius: 9px;
  border: 1px solid #2a3449;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}
.nav-toggle span { display: block; width: 17px; height: 2px; margin: 0 auto; background: #cfd8f0; border-radius: 2px; }

/* ---------- 首屏 ---------- */
.hero { padding: 112px 0 88px; }
.hero-inner { display: grid; grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr); gap: 56px; align-items: center; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid #2a3550;
  background: rgba(255, 255, 255, 0.035);
  color: #b9c5e2;
  font-size: 13px;
  letter-spacing: 0.02em;
  margin-bottom: 22px;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 12px var(--mint); }

.hero h1 { margin-bottom: 20px; }
.grad {
  background: linear-gradient(96deg, #a9b6ff 6%, #7f8fff 42%, #6ad8b4 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { color: #b8c4dd; font-size: 18.5px; line-height: 1.82; max-width: 50ch; }
.lead kbd { font-size: 0.82em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 22px 0 0; padding: 0; list-style: none; color: var(--muted-2); font-size: 13.5px; }
.hero-meta li { display: flex; align-items: center; gap: 8px; }
.hero-meta li::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: #40506f; }

/* ---------- 截图界面示意 ---------- */
.hero-visual { position: relative; }
.shot {
  position: relative;
  border-radius: 14px;
  border: 1px solid #26324a;
  background: #0a0f18;
  box-shadow: var(--shadow), 0 0 0 1px rgba(255, 255, 255, 0.02) inset;
  overflow: hidden;
}
.shot-desktop {
  position: relative;
  height: 400px;
  padding: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  grid-template-rows: auto auto;
  gap: 16px;
  background:
    radial-gradient(90% 70% at 80% 0%, rgba(72, 92, 190, 0.34), transparent 70%),
    linear-gradient(150deg, #1b2740, #121a2c 55%, #0d1421);
  filter: saturate(0.86) brightness(0.62);
}
.fake-window {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 12px;
  border-radius: 9px;
  background: rgba(14, 20, 33, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.3);
}
.fw-a { grid-row: span 2; }
.fw-b { grid-column: 2; }
.fw-c { grid-column: 2; }
.fw-bar { height: 7px; width: 46%; border-radius: 3px; background: #3a4a70; }
.fw-line { height: 5px; border-radius: 3px; background: #26334c; }
.fw-line.w80 { width: 82%; } .fw-line.w70 { width: 70%; } .fw-line.w62 { width: 62%; } .fw-line.w48 { width: 48%; }
.fw-block { flex: 1; min-height: 90px; border-radius: 6px; background: linear-gradient(140deg, #1d2a44, #182237); border: 1px solid rgba(255, 255, 255, 0.04); }
.fw-chip-row { display: flex; gap: 6px; }
.fw-chip-row i { display: block; height: 18px; flex: 1; border-radius: 5px; background: #1f2b44; }
.fw-chart { display: flex; align-items: flex-end; gap: 7px; height: 72px; margin-top: 4px; }
.fw-chart i { flex: 1; height: var(--h); border-radius: 4px 4px 0 0; background: linear-gradient(180deg, #47598f, #2b3a5c); }

/* 选区 */
.shot-select {
  position: absolute;
  inset: 64px 96px 186px 66px;
  border: 1.5px solid #8ea0ff;
  border-radius: 3px;
  box-shadow: 0 0 0 1px rgba(142, 160, 255, 0.25), 0 0 28px rgba(109, 125, 255, 0.28) inset;
  background: linear-gradient(180deg, rgba(109, 125, 255, 0.06), rgba(109, 125, 255, 0.02));
}
.h {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: #fff;
  border: 1.5px solid #6d7dff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
}
.h-tl { left: -5px; top: -5px; } .h-tc { left: calc(50% - 5px); top: -5px; } .h-tr { right: -5px; top: -5px; }
.h-ml { left: -5px; top: calc(50% - 5px); } .h-mr { right: -5px; top: calc(50% - 5px); }
.h-bl { left: -5px; bottom: -5px; } .h-bc { left: calc(50% - 5px); bottom: -5px; } .h-br { right: -5px; bottom: -5px; }
.shot-size {
  position: absolute;
  left: -1px;
  top: -26px;
  padding: 1px 7px;
  border-radius: 5px;
  background: #5b6bf0;
  color: #fff;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.6;
}

/* 工具栏 */
.shot-bar {
  position: absolute;
  left: 50%;
  bottom: 76px;
  transform: translateX(-50%);
  padding: 8px;
  border-radius: 12px;
  border: 1px solid #26324a;
  background: rgba(16, 22, 35, 0.96);
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
}
.bar-row { display: flex; align-items: center; gap: 4px; }
.bar-row + .bar-row { margin-top: 6px; padding-top: 6px; border-top: 1px solid #202b40; }
.bar-group { display: flex; gap: 4px; }
.bar-sep { width: 1px; height: 20px; margin: 0 4px; background: #263149; }
.bar-btn {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  border: 1px solid transparent;
  background: transparent;
  color: #b9c5e0;
  font-size: 13px;
  font-weight: 600;
  cursor: default;
}
.bar-btn.is-tool { width: 27px; height: 27px; font-size: 12.5px; color: #93a0bd; }
.bar-btn.is-on { background: rgba(109, 125, 255, 0.22); border-color: #6172e6; color: #fff; }

/* HUD */
.shot-hud {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: calc(100% - 40px);
  padding: 7px 9px 7px 13px;
  border-radius: 999px;
  border: 1px solid #2c3853;
  background: rgba(13, 18, 28, 0.94);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
  font-size: 12.5px;
  color: #c6d1ea;
  white-space: nowrap;
  overflow: hidden;
}
.hud-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--danger); box-shadow: 0 0 10px var(--danger); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.35; } }
.shot-hud b { color: #e6ecff; font-size: 12.5px; }
.hud-count { color: #9fb0ff; }
.hud-file { color: #7f8cad; overflow: hidden; text-overflow: ellipsis; max-width: 190px; font-family: var(--mono); font-size: 11.5px; }
.hud-stop { margin-left: 2px; padding: 3px 10px; border-radius: 6px; background: #ff5a5f; color: #fff; font-weight: 650; font-size: 12px; }

.shot-note { margin-top: 12px; text-align: center; color: var(--muted-2); font-size: 12.5px; }

/* ---------- 数据条 ---------- */
.stats { padding: 40px 0 18px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.stat {
  padding: 26px 26px;
  border-radius: 13px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.012));
}
.stat b { display: block; font-size: 27px; font-weight: 780; letter-spacing: -0.02em; color: #f0f4ff; }
.stat b small { font-size: 14px; font-weight: 650; color: var(--muted); margin-left: 2px; }
.stat span { display: block; margin-top: 5px; color: var(--muted-2); font-size: 13.5px; line-height: 1.6; }

/* ---------- 通用区块 ---------- */
.section { padding: 132px 0; }
.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.022), transparent);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.section-head { max-width: 720px; margin: 0 auto 68px; text-align: center; }
.eyebrow {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.24em;
  font-weight: 650;
  color: #6a79a8;
  text-transform: uppercase;
}
.section-head h2 { margin-bottom: 14px; }
.section-sub { color: var(--muted); font-size: 17px; line-height: 1.8; }

/* 特性网格：12 栅格错落排布，卡片高低左右各自不同，像水幕一层层落下 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 30px 26px;
  align-items: start;
}
.feature-grid .card { grid-column: span 4; }
.feature-grid .card:nth-child(1) { grid-column: span 5; --tx: -64px; --delay: 0ms; }
.feature-grid .card:nth-child(2) { grid-column: span 4; margin-top: 52px; --tx: 58px; --delay: 90ms; }
.feature-grid .card:nth-child(3) { grid-column: span 3; margin-top: 100px; --tx: -44px; --delay: 180ms; }
.feature-grid .card:nth-child(4) { grid-column: span 3; --tx: 48px; --delay: 40ms; }
.feature-grid .card:nth-child(5) { grid-column: span 5; margin-top: 58px; --tx: -58px; --delay: 130ms; }
.feature-grid .card:nth-child(6) { grid-column: span 4; margin-top: 20px; --tx: 54px; --delay: 220ms; }
.feature-grid .card:nth-child(7) { grid-column: span 4; --tx: -50px; --delay: 60ms; }
.feature-grid .card:nth-child(8) { grid-column: span 5; margin-top: 62px; --tx: 56px; --delay: 150ms; }
.feature-grid .card:nth-child(9) { grid-column: span 3; margin-top: 20px; --tx: -46px; --delay: 240ms; }
/* 卡片本身带一点纵向落下的层次 */
.feature-grid .card:nth-child(3n+2) { padding-bottom: 30px; }
.feature-grid .card:nth-child(3n) { padding-bottom: 22px; }
.card {
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: 34px 30px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, #121a28, #0e1420);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-3px); border-color: #33415f; box-shadow: 0 18px 42px rgba(0, 0, 0, 0.35); }
.card-ico {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
  border: 1px solid #2c3a58;
  background: linear-gradient(180deg, rgba(109, 125, 255, 0.18), rgba(109, 125, 255, 0.05));
  color: #a3b0ff;
  margin-bottom: 4px;
}
.card-ico svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { font-size: 19.5px; }
.card p { color: #adb9d2; font-size: 15.5px; line-height: 1.8; }
.card-tag {
  margin-top: auto;
  padding-top: 8px;
  color: #7180a5 !important;
  font-size: 12.5px !important;
  font-family: var(--mono);
  letter-spacing: 0.01em;
}

/* 左右分栏：整体错位，文案与视觉不在同一基线上 */
.split { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 86px; align-items: center; }
.split.reverse { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
.split .split-copy { margin-top: -34px; }
.split .split-visual { margin-top: -72px; }
.split.reverse .split-copy { margin-top: 52px; }
.split.reverse .split-visual { margin-top: 42px; will-change: transform; }
/* 分栏进场方向：文字与视觉一左一右相向而来 */
.split .split-copy.reveal { --tx: -58px; }
.split .split-visual.reveal { --tx: 58px; --delay: 90ms; }
.split.reverse .split-copy.reveal { --tx: 58px; }
.split.reverse .split-visual.reveal { --tx: -58px; }
.stat.reveal:nth-child(odd) { --tx: -38px; }
.stat.reveal:nth-child(even) { --tx: 38px; --delay: 80ms; }
.split.reverse .split-visual { order: -1; }
.split-copy h2 { margin-bottom: 16px; }
.split-copy > p { color: var(--muted); }
.fineprint { margin-top: 16px; color: var(--muted-2) !important; font-size: 13px; line-height: 1.7; }

.steps-list { list-style: none; counter-reset: s; margin: 28px 0 0; padding: 0; display: flex; flex-direction: column; gap: 20px; }
.steps-list li { position: relative; padding-left: 40px; counter-increment: s; }
.steps-list li::before {
  content: counter(s, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: #7c8cff;
  padding-top: 3px;
}
.steps-list b { display: block; font-size: 16.5px; color: #e6ecff; margin-bottom: 4px; }
.steps-list span { color: var(--muted); font-size: 15.5px; line-height: 1.8; }

.check-list { list-style: none; margin: 22px 0 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.check-list li { position: relative; padding-left: 26px; color: #b2bed6; font-size: 15.5px; line-height: 1.8; }
.check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, #7f8fff, #4fd6a8);
  transform: rotate(45deg);
}

/* 时间轴示意 */
.timeline { padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel-2); display: flex; flex-direction: column; gap: 20px; }
.tl-row { display: grid; grid-template-columns: 120px minmax(0, 1fr); align-items: center; gap: 14px; }
.tl-label { font-size: 12.5px; color: #9aa8c6; line-height: 1.45; }
.tl-track { position: relative; height: 8px; border-radius: 999px; background: #1a2336; overflow: hidden; }
.tl-fill { position: absolute; top: 0; bottom: 0; left: 0; border-radius: 999px; }
.tl-fill.f1 { width: 26%; background: linear-gradient(90deg, #6d7dff, #9aa6ff); }
.tl-fill.f2 { width: 92%; background: linear-gradient(90deg, rgba(79, 214, 168, 0.35), rgba(79, 214, 168, 0.85)); }
.tl-fill.f3 { width: 100%; background: linear-gradient(90deg, #7d8cff, #4fd6a8); }
.tl-row .tl-time { grid-column: 2; margin-top: -12px; font-size: 12px; color: var(--muted-2); }
.tl-note { margin: 0; text-align: right; font-size: 12px; color: #5d6a87; }

/* 吸附示意 */
.snap-demo { padding: 24px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel-2); }
.snap-window { border: 1.5px solid #8ea0ff; border-radius: 9px; background: #121a2b; padding: 14px; box-shadow: 0 0 30px rgba(109, 125, 255, 0.18); }
.snap-title { display: block; font-size: 12px; color: #8f9cbb; margin-bottom: 10px; }
.snap-inner { display: flex; flex-direction: column; gap: 8px; }
.snap-control { padding: 9px 12px; border-radius: 7px; border: 1px dashed #2c3a58; background: #16202f; color: #7f8cab; font-size: 12.5px; }
.snap-control.is-hot { border: 1.5px solid #4fd6a8; color: #b9f5dd; background: rgba(79, 214, 168, 0.09); box-shadow: 0 0 18px rgba(79, 214, 168, 0.18); }
.snap-legend { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; font-size: 12.5px; color: var(--muted-2); }
.snap-legend span { display: flex; align-items: center; gap: 7px; }
.snap-legend i { width: 10px; height: 10px; border-radius: 2px; display: block; }
.lg-a { border: 1.5px solid #8ea0ff; }
.lg-b { border: 1.5px solid #4fd6a8; }
.snap-hint { margin-left: auto; }

/* 长截图示意 */
.long-demo { padding: 22px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel-2); }
.long-page { display: flex; flex-direction: column; gap: 7px; padding: 14px; border-radius: 9px; background: #101827; border: 1px solid #1e2a40; }
.long-page i { display: block; height: 9px; border-radius: 3px; background: #223049; }
.long-page i.hl { background: linear-gradient(90deg, #3a4a78, #5b6bf0); }
.long-seam { position: relative; height: 34px; margin: 8px 0; display: flex; align-items: center; justify-content: center; }
.long-seam::before, .long-seam::after { content: ""; position: absolute; top: 50%; width: calc(50% - 46px); border-top: 1px dashed #3c4a6d; }
.long-seam::before { left: 0; } .long-seam::after { right: 0; }
.long-seam span { padding: 3px 10px; border-radius: 999px; border: 1px solid #3c4a6d; background: #131c2c; color: #8e9bb8; font-size: 11.5px; }
.long-page-2 { opacity: 0.85; }

/* 双栏面板：一高一低，避免并排后成一条直线 */
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; align-items: start; }
.duo .panel:nth-child(1) { margin-top: 8px; }
.duo .panel:nth-child(2) { margin-top: 64px; }
.panel { padding: 38px 34px; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(180deg, #121a28, #0d1320); }
.panel h3 { font-size: 20px; margin-bottom: 8px; }
.panel > p { color: var(--muted); font-size: 14.8px; }
.panel .check-list { margin-top: 16px; }

/* 工作流：三级台阶，逐级向右下推进 */
.flow { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: start; gap: 34px; }
.flow > .flow-step:nth-child(1) { margin-top: 0; margin-left: 0; }
.flow > .flow-step:nth-child(3) { margin-top: 58px; margin-left: 16px; }
.flow > .flow-step:nth-child(5) { margin-top: 116px; margin-left: 32px; }
.flow-arrow { display: none; }
.flow-step { padding: 26px 22px; border-radius: var(--radius); border: 1px solid var(--line-soft); background: rgba(255, 255, 255, 0.022); }
.flow-num { font-family: var(--mono); font-size: 12.5px; color: #7c8cff; letter-spacing: 0.1em; }
.flow-step h3 { margin: 8px 0 8px; font-size: 19px; }
.flow-step p { color: var(--muted); font-size: 14.5px; }
.flow-arrow { position: relative; height: 2px; margin-top: 66px; background: linear-gradient(90deg, #33415f, transparent); }
.flow-arrow::after { content: ""; position: absolute; right: 0; top: -4px; border-left: 8px solid #46578a; border-top: 5px solid transparent; border-bottom: 5px solid transparent; }

/* 快捷键表 */
.keys { width: 100%; border-collapse: separate; border-spacing: 0; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background: var(--panel-2); }
.keys td { padding: 13px 18px; border-bottom: 1px solid var(--line-soft); font-size: 14.5px; }
.keys tr:last-child td { border-bottom: 0; }
.keys td:first-child { width: 47%; white-space: nowrap; }
.keys td:last-child { color: var(--muted); }
.keys tr:hover td { background: rgba(255, 255, 255, 0.025); }

/* 下载 */
.download { padding-top: 40px; }
.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 0;
  border-radius: 20px;
  border: 1px solid #2b3a58;
  background:
    radial-gradient(80% 120% at 0% 0%, rgba(109, 125, 255, 0.16), transparent 62%),
    linear-gradient(180deg, #131b2b, #0d1320);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.dl-main { padding: 46px 44px; }
.dl-head { display: flex; align-items: center; gap: 16px; }
.dl-head img { border-radius: 14px; box-shadow: 0 10px 26px rgba(0, 0, 0, 0.45); }
.dl-head h2 { font-size: 27px; margin-bottom: 4px; }
.dl-head p { color: var(--muted); font-size: 14px; }
.dl-facts { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }
.dl-facts span { display: flex; flex-direction: column; gap: 1px; padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line-soft); background: rgba(255, 255, 255, 0.025); font-size: 14px; color: #dfe6f8; }
.dl-facts b { font-size: 11px; letter-spacing: 0.12em; color: var(--muted-2); font-weight: 600; }
.dl-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.dl-note { color: var(--muted-2); font-size: 13px; }
.dl-hash { display: flex; align-items: center; gap: 10px; margin-top: 22px; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line-soft); background: #0b111c; overflow: hidden; }
.dl-hash-label { flex: none; font-size: 11px; letter-spacing: 0.1em; color: var(--muted-2); }
.dl-hash code { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #9fb0d8; font-size: 11.5px; }
.dl-side { padding: 46px 40px; border-left: 1px solid var(--line-soft); background: rgba(6, 9, 15, 0.35); }
.dl-side h3 { font-size: 15px; letter-spacing: 0.02em; color: #dfe6f8; margin-bottom: 14px; }
.dl-steps { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 12px; color: var(--muted); font-size: 14px; }
.dl-steps li::marker { color: #7c8cff; font-family: var(--mono); }
.dl-steps b { display: block; color: #e2e9fa; font-size: 14.5px; margin-bottom: 2px; }
.disclaimer { margin-top: 20px; padding-top: 16px; border-top: 1px dashed #2a3550; color: var(--muted-2); font-size: 12.5px; line-height: 1.7; }

/* FAQ */
.faq-wrap { width: min(920px, calc(100% - 48px)); }
.faq-item { border-bottom: 1px solid var(--line-soft); }
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 4px;
  font-size: 17.5px;
  font-weight: 600;
  color: #e6ecff;
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  flex: none;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  border: 1px solid #2c3a58;
  color: #93a2c6;
  font-weight: 500;
  transition: transform 0.2s ease, color 0.2s ease;
}
.faq-item[open] summary::after { content: "−"; color: #a9b6ff; border-color: #46578a; }
.faq-item p { padding: 0 4px 28px; color: var(--muted); font-size: 16px; line-height: 1.85; max-width: 68ch; }
.faq-item code { background: #131b2b; padding: 1px 6px; border-radius: 5px; }
/* FAQ 左右交错进场 */
.faq-item.reveal:nth-of-type(odd) { --tx: -44px; }
.faq-item.reveal:nth-of-type(even) { --tx: 44px; --delay: 70ms; }
/* 面板与台阶的进场方向 */
.panel.reveal:nth-child(1) { --tx: -48px; }
.panel.reveal:nth-child(2) { --tx: 48px; --delay: 100ms; }
.flow-step.reveal:nth-child(1) { --tx: -44px; }
.flow-step.reveal:nth-child(3) { --tx: -44px; --delay: 110ms; }
.flow-step.reveal:nth-child(5) { --tx: -44px; --delay: 220ms; }
.download-card.reveal { --ty: 56px; }

/* 页脚 */
.footer { border-top: 1px solid var(--line-soft); padding: 58px 0 66px; margin-top: 20px; }
.footer-inner { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.foot-brand { display: flex; align-items: center; gap: 11px; }
.foot-brand img { border-radius: 8px; }
.foot-brand b { display: block; font-size: 15px; }
.foot-brand span { display: block; color: var(--muted-2); font-size: 12px; }
.foot-links { display: flex; gap: 18px; margin-left: auto; }
.foot-links a { color: var(--muted); font-size: 13.5px; }
.foot-links a:hover { color: #dfe6ff; }
.foot-copy { width: 100%; margin: 0; padding-top: 22px; border-top: 1px solid #141b29; color: #5c6883; font-size: 12.5px; }

/* 首屏载入：文字逐行落下，界面示意浮入
   走 .reveal 过渡系统而不是 keyframes —— 过渡由脚本加类触发，
   动画卡住时标题不会永远停在 opacity:0 上 */
.hero-copy > .reveal { --ty: 24px; --tx: 0; }
.hero-copy > .reveal:nth-child(1) { --delay: 40ms; }
.hero-copy > .reveal:nth-child(2) { --delay: 100ms; }
.hero-copy > .reveal:nth-child(3) { --delay: 170ms; }
.hero-copy > .reveal:nth-child(4) { --delay: 240ms; }
.hero-copy > .reveal:nth-child(5) { --delay: 310ms; }
.hero-visual.reveal { --ty: 30px; --tx: 0; --delay: 200ms; }
/* 通用详情页：产品名 + 标语较长，标题压小一档避免折成三行 */
#page .hero h1 { font-size: clamp(30px, 3.8vw, 46px); }

/* 滚动出现：方向 + 延迟 + 轻微模糊，形成「瀑布」节奏；默认可见，脚本确认后才隐藏 */
.js .reveal {
  opacity: 0;
  transform: translate3d(var(--tx, 0), var(--ty, 30px), 0) scale(0.988);
  filter: blur(7px);
  transition:
    opacity 0.72s cubic-bezier(0.16, 1, 0.3, 1) var(--delay, 0ms),
    transform 0.95s cubic-bezier(0.16, 1, 0.3, 1) var(--delay, 0ms),
    filter 0.72s ease var(--delay, 0ms);
  will-change: transform, opacity;
}
.js .reveal.is-in { opacity: 1; transform: none; filter: none; }
/* 左右交替的方向感 */
.reveal[data-from="left"] { --tx: -52px; }
.reveal[data-from="right"] { --tx: 52px; }

/* ---------- 跨页过渡（首页 ↔ 产品页）----------
   走跨文档 View Transitions API：旧页淡出轻抬，新页淡入微升。
   这套规则只作用于浏览器在跳转期间生成的过渡快照，
   页面本身的内容可见性不依赖它们 —— 不支持的浏览器退化为普通跳转 */
@view-transition { navigation: auto; }

@keyframes vt-page-out {
  from { opacity: 1; transform: none; filter: none; }
  to   { opacity: 0; transform: translateY(-14px) scale(0.992); filter: blur(5px); }
}
@keyframes vt-page-in {
  from { opacity: 0; transform: translateY(18px); filter: blur(7px); }
  to   { opacity: 1; transform: none; filter: none; }
}
::view-transition-old(root) {
  animation: vt-page-out 0.3s cubic-bezier(0.55, 0, 1, 0.45) both;
}
::view-transition-new(root) {
  animation: vt-page-in 0.52s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) { animation: none; }
}
.reveal[data-from="up"] { --ty: 44px; }
/* 区块标题跟随滚动轻落 */
.section-head.reveal { --ty: 38px; }

/* 顶部滚动进度 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 60;
  pointer-events: none;
  background: transparent;
}
.scroll-progress i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #6d7dff, #9aa6ff 55%, #4fd6a8);
  box-shadow: 0 0 14px rgba(109, 125, 255, 0.65);
  transition: width 0.12s linear;
}

/* ==========================================================================
   东土大唐 BigTang · 集合站首页
   品牌层用暖金（与 DuckCut 的蓝紫产品色区分），产品层各自带自己的主色
   ========================================================================== */

:root {
  --gold: #e8b45c;
  --gold-2: #ffd88a;
  --gold-deep: #c98b3c;
}

/* 品牌标记 */
.bt-mark {
  display: inline-flex;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
}
.bt-mark svg { width: 100%; height: 100%; display: block; }
.bt-mark rect { fill: #14100a; }
.bt-mark path { fill: var(--gold); }
.bt-mark circle { fill: var(--gold-2); }
.bt-mark-sm { width: 28px; height: 28px; border-radius: 8px; }

.brand-bt .brand-text em { letter-spacing: 0.24em; }

/* 产品页顶部的「回到 BigTang」 */
.nav-home {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
  padding: 7px 11px;
  border-radius: 9px;
  border: 1px solid #2c3750;
  color: var(--muted);
  font-size: 13.5px;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.nav-home svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.nav-home:hover { color: var(--gold-2); border-color: #4a3c22; background: rgba(232, 180, 92, 0.08); }
.nav-links + .nav-home { margin-left: 0; }
.nav-cta { margin-left: 0; }
.nav-inner > .nav-cta { margin-left: 12px; }

/* 品牌层主按钮：金色，低饱和的哑光质感，不跟深色背景抢戏 */
.btn-gold {
  background: linear-gradient(180deg, #f0c984, #c98b3c);
  color: #241704;
  box-shadow: 0 10px 26px rgba(201, 139, 60, 0.24), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}
.btn-gold:hover {
  color: #241704;
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(201, 139, 60, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.38);
}

/* 首页首屏 */
.hero-bt .hero-inner { grid-template-columns: minmax(0, 1fr); }
.hero-bt h1 { font-size: clamp(34px, 4.6vw, 58px); }
.hero-bt .grad {
  background: linear-gradient(96deg, #ffe0a4 4%, var(--gold) 44%, #d98f4c 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-bt .lead b { color: var(--text); font-weight: 650; }
.hero-bt .pill .dot { background: var(--gold); box-shadow: 0 0 12px var(--gold); }
.hero-bt .pill { border-color: #3a3220; background: rgba(232, 180, 92, 0.06); }

/* 品牌视觉：整幅盛唐长安全景铺满首屏，出血到屏幕右缘
   上下与左侧用遮罩向夜色渐隐，画面像从夜里漫出来而不是贴了张图 */
.hero-bt {
  position: relative;
  min-height: min(94vh, 900px);
  display: flex;
  align-items: center;
  padding: 132px 0 116px;
  overflow: hidden;
}
.hero-bt .hero-inner { position: relative; z-index: 3; }
.hero-bt .hero-copy { max-width: 620px; }
.bt-city {
  position: absolute;
  inset: 0;
  z-index: 1;
  margin: 0;
  isolation: isolate;
}
.bt-city img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 视口偏宽，主体在画面中部偏右，往右取景保住街道纵深 */
  object-position: 62% 52%;
  /* 压暗并偏冷，让金色品牌字与画面协调而不是被晨光压过 */
  filter: saturate(0.8) brightness(0.66) contrast(1.1);
  /* 上缘与底部向背景渐隐，避免出现生硬的横向切边 */
  -webkit-mask-image:
    linear-gradient(180deg, transparent 0%, #000 9%, #000 58%, rgba(0, 0, 0, 0.5) 82%, transparent 100%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.2) 0%, #000 34%, #000 100%);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(180deg, transparent 0%, #000 9%, #000 58%, rgba(0, 0, 0, 0.5) 82%, transparent 100%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.2) 0%, #000 34%, #000 100%);
  mask-composite: intersect;
}
.bt-city-veil {
  position: absolute;
  inset: 0;
  /* 左侧压深给标题留出可读区，右侧留给城景本身 */
  background:
    linear-gradient(90deg, rgba(8, 11, 18, 0.95) 0%, rgba(8, 11, 18, 0.8) 30%, rgba(8, 11, 18, 0.28) 58%, transparent 78%),
    radial-gradient(120% 96% at 68% 42%, transparent 42%, rgba(8, 11, 18, 0.55) 100%);
  pointer-events: none;
}
.bt-city-cap {
  position: absolute;
  right: 5%;
  bottom: 7%;
  z-index: 2;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.seal-ch {
  font-family: "STKaiti", "KaiTi", "楷体", "Songti SC", "SimSun", serif;
  font-size: 66px;
  line-height: 0.9;
  font-weight: 700;
  color: transparent;
  background: linear-gradient(160deg, #ffe7b6 6%, var(--gold) 46%, #b9792f 96%);
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 6px 22px rgba(0, 0, 0, 0.85));
}
.seal-latin {
  font-size: 11.5px;
  letter-spacing: 0.34em;
  color: #e3c896;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.9);
}

/* ---------- 关于东土大唐 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px;
  align-items: start;
}
.about-copy p { color: #adb9d2; font-size: 16px; line-height: 1.9; }
.about-copy p + p { margin-top: 18px; }
.about-lead {
  color: var(--text) !important;
  font-size: 19.5px !important;
  line-height: 1.8 !important;
  font-weight: 500;
}
.about-copy strong { color: var(--gold-2); font-weight: 650; }
.about-not {
  list-style: none;
  margin: 32px 0 0;
  padding: 26px 28px;
  border-radius: var(--radius);
  border: 1px solid #3a3220;
  background: linear-gradient(180deg, rgba(232, 180, 92, 0.06), rgba(232, 180, 92, 0.015));
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.about-not li {
  position: relative;
  padding-left: 28px;
  color: #bcc6dc;
  font-size: 15px;
  line-height: 1.7;
}
.about-not li::before {
  content: "✕";
  position: absolute;
  left: 2px;
  top: 0;
  color: #8a6b3c;
  font-size: 13px;
  font-weight: 700;
}

.about-rules { display: flex; flex-direction: column; gap: 16px; }
.rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 26px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.008));
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.rule:hover { border-color: #3a3220; transform: translateX(3px); }
.rule-no {
  font-family: var(--mono);
  font-size: 13px;
  color: #7a6a45;
  letter-spacing: 0.06em;
  padding-top: 3px;
}
.rule-body h3 { font-size: 17.5px; margin-bottom: 8px; display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.rule-body p { color: var(--muted); font-size: 15px; line-height: 1.8; }

/* ---------- 产品清单（首页只列清单，详情在专项页） ---------- */
.plist { display: flex; flex-direction: column; gap: 18px; }
.pl-row {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 30px;
  align-items: center;
  padding: 34px 38px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(70% 130% at 0% 0%, color-mix(in srgb, var(--accent, #6d7dff) 10%, transparent), transparent 56%),
    linear-gradient(180deg, #121a28, #0e1420);
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  overflow: hidden;
}
.pl-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20%;
  bottom: 20%;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--accent, #6d7dff);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.pl-row.is-live:hover::before { opacity: 0.9; }
.pl-row:hover {
  transform: translateX(6px);
  border-color: color-mix(in srgb, var(--accent, #6d7dff) 46%, #2c3750);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.4);
}
.pl-row.is-plan {
  border-style: dashed;
  border-color: #2b3346;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.005));
}
.pl-row.is-plan:hover { transform: none; border-color: #3a4359; box-shadow: none; }

.pl-ico { flex: none; }
.pl-ico-in {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 34%, transparent);
  background: color-mix(in srgb, var(--accent, #6d7dff) 12%, transparent);
  overflow: hidden;
}
.pl-ico-in img { width: 100%; height: 100%; object-fit: contain; }
.pl-ico-in.ghost { position: relative; }
.pl-ico-in.ghost::after {
  content: "";
  width: 13px;
  height: 13px;
  border-radius: 3px;
  transform: rotate(45deg);
  background: var(--accent, #6d7dff);
  opacity: 0.7;
}
.pl-main { min-width: 0; }
.pl-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.pl-head b { font-size: 21px; font-weight: 750; letter-spacing: -0.01em; }
.pl-head em {
  font-style: normal;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--muted-2);
  font-weight: 600;
  text-transform: uppercase;
}
.pl-badge {
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.06em;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 40%, transparent);
  color: color-mix(in srgb, var(--accent, #6d7dff) 80%, #fff);
  background: color-mix(in srgb, var(--accent, #6d7dff) 12%, transparent);
}
.pl-badge.is-plan { border-color: #3a4257; color: #94a0bb; background: rgba(255, 255, 255, 0.03); }
.pl-tagline { display: block; color: var(--gold-2); font-size: 14.5px; }
.is-plan .pl-tagline { color: #8d8570; }
.pl-summary {
  display: block;
  margin-top: 8px;
  color: #a3b0ca;
  font-size: 15px;
  line-height: 1.78;
  max-width: 68ch;
}
.pl-side { flex: none; display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.pl-meta { font-family: var(--mono); font-size: 12.5px; color: var(--muted-2); letter-spacing: 0.02em; }
.pl-action { display: inline-flex; align-items: center; gap: 7px; }
.pl-go {
  padding: 7px 13px;
  border-radius: 9px;
  font-size: 13.5px;
  font-weight: 650;
  color: #dbe3ff;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 40%, transparent);
  background: color-mix(in srgb, var(--accent, #6d7dff) 14%, transparent);
  transition: background 0.18s ease, color 0.18s ease;
}
.pl-row:hover .pl-go { background: color-mix(in srgb, var(--accent, #6d7dff) 26%, transparent); color: #fff; }
.pl-arrow { color: color-mix(in srgb, var(--accent, #6d7dff) 80%, #fff); font-size: 14px; transition: transform 0.18s ease; }
.pl-row:hover .pl-arrow { transform: translateX(3px); }
.pl-action.is-plan .pl-go { border-color: #333c50; color: #8d97ae; background: rgba(255, 255, 255, 0.025); }
.plist-note {
  margin-top: 18px;
  color: var(--muted-2);
  font-size: 13.5px;
  text-align: center;
}

/* ---------- 首页区块标题：金线装饰 + 更大气韵 ---------- */
.home .section-head { max-width: 780px; }
.home .section-head .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: #9b8659;
  font-size: 12.5px;
}
.home .section-head .eyebrow::before,
.home .section-head .eyebrow::after {
  content: "";
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(232, 180, 92, 0.7));
}
.home .section-head .eyebrow::after {
  background: linear-gradient(90deg, rgba(232, 180, 92, 0.7), transparent);
}
.home .section-head h2 { font-size: clamp(31px, 3.7vw, 48px); letter-spacing: -0.02em; }
.home .section-sub { font-size: 17.5px; color: #a6b2cd; }

/* 品牌区底部渐隐，把两段内容拉开距离 */
.home .stats { position: relative; }
.home .stats::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: min(1100px, 88%);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(232, 180, 92, 0.24), transparent);
}

/* ---------- 通用产品详情页 ---------- */
.pd-visual {
  position: relative;
  display: grid;
  place-items: center;
  gap: 14px;
  aspect-ratio: 4 / 3;
  border-radius: 20px;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 26%, transparent);
  background:
    radial-gradient(70% 60% at 50% 34%, color-mix(in srgb, var(--accent, #6d7dff) 20%, transparent), transparent 68%),
    linear-gradient(165deg, #141a27, #0d121d 62%, #0a0e16);
  box-shadow: var(--shadow), 0 0 0 1px rgba(255, 255, 255, 0.03) inset;
  overflow: hidden;
}
.pd-visual::after {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 16%, transparent);
  pointer-events: none;
}
.pd-visual img,
.pd-visual .pc-ico {
  position: relative;
  z-index: 1;
  width: 84px;
  height: 84px;
  border-radius: 22px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}
.pd-visual b {
  position: relative;
  z-index: 1;
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.01em;
}
.pd-visual small {
  position: relative;
  z-index: 1;
  margin-top: -8px;
  font-size: 11.5px;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.pd-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.pd-card {
  position: relative;
  padding: 26px 24px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.008));
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.pd-card:hover {
  border-color: color-mix(in srgb, var(--accent, #6d7dff) 38%, transparent);
  transform: translateY(-3px);
}
.pd-no {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--accent, #6d7dff) 78%, #fff);
  margin-bottom: 12px;
}
.pd-card h3 { font-size: 17px; line-height: 1.5; }

.pd-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.pd-metrics > div {
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
}
.pd-metrics b {
  display: block;
  font-size: 26px;
  font-weight: 780;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 4px;
}
.pd-metrics span { color: var(--muted-2); font-size: 13px; }

/* 共同内核 */
.pc-ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid color-mix(in srgb, var(--accent, #6d7dff) 34%, transparent);
  background: color-mix(in srgb, var(--accent, #6d7dff) 12%, transparent);
  overflow: hidden;
}
.pc-ico img { width: 100%; height: 100%; object-fit: contain; }
.pc-ico.ghost { position: relative; }
.pc-ico.ghost::after {
  content: "";
  width: 13px;
  height: 13px;
  border-radius: 3px;
  transform: rotate(45deg);
  background: var(--accent, #6d7dff);
  opacity: 0.7;
}
.kernel-state {
  flex: none;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.05em;
  border: 1px solid #2f3b52;
  color: #8fa0c4;
}
.kernel-state.is-now { border-color: rgba(79, 214, 168, 0.42); color: #7fe3c2; background: rgba(79, 214, 168, 0.08); }
.kernel-state.is-plan { border-color: #3b3427; color: #c9a86a; background: rgba(232, 180, 92, 0.07); }

/* 路线图 */
.roadmap { display: flex; flex-direction: column; gap: 24px; }
.rm-item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  padding: 30px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.008));
  position: relative;
}
.rm-item.is-live { border-color: color-mix(in srgb, var(--accent, #6d7dff) 32%, transparent); }
.rm-when { font-family: var(--mono); font-size: 13px; color: var(--gold-2); letter-spacing: 0.04em; }
.rm-item.is-plan .rm-when { color: #8d8570; }
.rm-body h3 { font-size: 19.5px; margin-bottom: 8px; }
.rm-body p { color: var(--muted); font-size: 15px; line-height: 1.8; }
.rm-body .rm-list { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 9px; }
.rm-body .rm-list li {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
  font-size: 13px;
  color: #a5b1cb;
}

/* 首页下载区沿用详情页的卡片样式，仅补标题层级 */
.home-dl-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 32px; flex-wrap: wrap; }
.home-dl-head h2 { margin: 0; }
.home-dl-head p { color: var(--muted); font-size: 15.5px; }

/* 进场方向：左右交替，配合瀑布错落 */
.pl-row:nth-child(odd) { --tx: -46px; }
.pl-row:nth-child(even) { --tx: 46px; --delay: 90ms; }
.rule:nth-child(odd) { --tx: -34px; }
.rule:nth-child(even) { --tx: 34px; --delay: 70ms; }
.rm-item.reveal { --tx: -42px; }
.rm-item.reveal:nth-child(even) { --tx: 42px; --delay: 80ms; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr); gap: 44px; }
  .hero { padding-top: 84px; }
  .feature-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-grid .card,
  .feature-grid .card:nth-child(n) { grid-column: 1 / -1; margin-top: 0; padding-bottom: 22px; --tx: 0; --ty: 34px; }
  .split { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .split .split-copy,
  .split .split-visual,
  .split.reverse .split-copy,
  .split.reverse .split-visual { margin-top: 0; --tx: 0; --ty: 30px; }
  .split.reverse .split-visual { order: 0; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .rule.reveal { --tx: 0; --ty: 28px; }
  .rm-item { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .rm-item.reveal { --tx: 0; --ty: 28px; }
  .flow { grid-template-columns: minmax(0, 1fr); }
  .flow > .flow-step,
  .flow > .flow-step:nth-child(n) { margin: 0; }
  .duo .panel:nth-child(n) { margin-top: 0; }
  .flow-arrow { display: none; }
  .download-card { grid-template-columns: minmax(0, 1fr); }
  .dl-side { border-left: 0; border-top: 1px solid var(--line-soft); }
  .pd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pd-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .wrap, .faq-wrap { width: calc(100% - 36px); }
  .nav-inner { height: 64px; gap: 12px; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 2px;
    padding: 10px 18px 16px;
    background: rgba(9, 13, 21, 0.82);
    border-bottom: 1px solid var(--line);
    -webkit-backdrop-filter: blur(24px) saturate(175%);
    backdrop-filter: blur(24px) saturate(175%);
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 11px 8px; font-size: 15.5px; }
  .nav-cta { margin-left: auto; padding: 7px 14px; font-size: 14px; }
  .nav-toggle { display: flex; margin-left: 0; }
  .hero { padding: 56px 0 40px; }
  .hero h1 { font-size: clamp(32px, 8.6vw, 44px); }
  .lead { font-size: 16.5px; }
  .hero-actions { gap: 10px; }
  .btn-lg { padding: 12px 20px; font-size: 15.5px; }
  .feature-grid, .duo { grid-template-columns: minmax(0, 1fr); }
  .card { padding: 26px 22px; }
  .panel { padding: 26px 22px; }
  .pl-row { grid-template-columns: auto minmax(0, 1fr); gap: 14px; padding: 20px 18px; }
  .pl-side { grid-column: 1 / -1; flex-direction: row; align-items: center; justify-content: space-between; }
  .pl-summary { display: none; }
  .bt-city-cap { right: 18px; bottom: 16px; gap: 12px; }
  .seal-ch { font-size: 46px; }
  .seal-latin { font-size: 10px; letter-spacing: 0.26em; }
  /* 窄屏文字压在画面上，改成上下压深，保证标题仍然清晰 */
  .hero-bt { min-height: 0; padding: 76px 0 64px; }
  .hero-bt .hero-copy { max-width: none; }
  .bt-city img { object-position: 62% 50%; filter: saturate(0.8) brightness(0.62) contrast(1.06); }
  .bt-city-veil {
    background:
      linear-gradient(180deg, rgba(8, 11, 18, 0.9) 0%, rgba(8, 11, 18, 0.6) 42%, rgba(8, 11, 18, 0.84) 100%),
      radial-gradient(120% 96% at 68% 40%, transparent 44%, rgba(8, 11, 18, 0.5) 100%);
  }
  .nav-home { display: none; }
  .stats-grid { gap: 10px; }
  .stat { padding: 18px 16px; }
  .section { padding: 76px 0; }
  .section-head { margin-bottom: 44px; }
  .faq-item summary { padding: 20px 2px; font-size: 16.5px; }
  .about-not, .rule, .rm-item { padding: 22px 20px; }
  .shot-desktop { height: 290px; padding: 16px; gap: 10px; }
  .shot-select { inset: 42px 34px 152px 38px; }
  .shot-bar { bottom: 56px; transform: translateX(-50%) scale(0.86); }
  .shot-hud { font-size: 11px; gap: 7px; padding: 6px 8px 6px 10px; }
  .hud-file { display: none; }
  .shot-note { display: none; }
  .timeline { padding: 18px; gap: 15px; }
  .tl-row { grid-template-columns: 92px minmax(0, 1fr); gap: 12px; }
  .snap-hint { margin-left: 0; }
  .download-card { border-radius: 16px; }
  .dl-main, .dl-side { padding: 22px; }
  .dl-head h2 { font-size: 23px; }
  .foot-links { width: 100%; margin-left: 0; gap: 14px; }
  .pd-grid, .pd-metrics { grid-template-columns: minmax(0, 1fr); }
  .pd-card { padding: 22px 20px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hud-dot { animation: none; }
  .card, .btn { transition: none; }
}