/* ==========================================================================
   云速科技官网 · 设计系统
   风格：深空蓝 + 亮青 · 现代科技感 · 玻璃拟态 · 微动效
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 深色系 */
  --ink-900: #04101f;
  --ink-800: #061b33;
  --ink-700: #0a2846;
  --ink-600: #10365c;
  /* 品牌色 */
  --brand: #1670e8;
  --brand-dark: #0e56bb;
  --brand-light: #4a95f5;
  --cyan: #22d3ee;
  --cyan-soft: #7ee7f7;
  /* 中性 */
  --text: #0b1b2e;
  --text-2: #48596f;
  --text-3: #7d8ea4;
  --bg: #ffffff;
  --bg-soft: #f4f7fc;
  --bg-soft-2: #eaf1fa;
  --line: #e2eaf4;
  --line-2: #d3dfee;
  /* 语义 */
  --ok: #0d8a5f;
  --warn: #b5710a;
  /* 尺寸 */
  --wrap: 1200px;
  --nav-h: 74px;
  --radius: 14px;
  --radius-sm: 9px;
  /* 阴影 */
  --sh-sm: 0 2px 8px rgba(10, 40, 70, .05);
  --sh: 0 8px 28px rgba(10, 40, 70, .08);
  --sh-lg: 0 22px 60px rgba(10, 40, 70, .13);
  --sh-glow: 0 0 40px rgba(34, 211, 238, .28);
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; border: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; letter-spacing: -.015em; }
h1 { font-size: 46px; }
h2 { font-size: 34px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }
p { color: var(--text-2); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: 2.4px;
  text-transform: uppercase; color: var(--brand);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 22px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
}
.eyebrow.on-dark { color: var(--cyan-soft); }

.lead { font-size: 16.5px; line-height: 1.85; color: var(--text-2); }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(226, 234, 244, .9);
  transition: box-shadow .3s, background .3s;
}
.nav.scrolled { box-shadow: var(--sh); background: rgba(255, 255, 255, .94); }

.nav .wrap { display: flex; align-items: center; gap: 34px; width: 100%; }

.logo { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.logo img { height: 40px; width: auto; }
.logo .lt { font-size: 17px; font-weight: 700; letter-spacing: .5px; color: var(--text); }
.logo .ls { display: block; font-size: 9px; letter-spacing: 2.4px; color: var(--text-3); font-weight: 500; margin-top: -3px; }

.menu { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.menu > li { position: relative; }
.menu > li > a {
  display: block; padding: 10px 15px; font-size: 14.5px; font-weight: 500;
  color: var(--text-2); border-radius: 8px; transition: color .2s, background .2s;
}
.menu > li > a:hover { color: var(--brand); background: var(--bg-soft); }
.menu > li.active > a { color: var(--brand); font-weight: 600; }
.menu > li.active > a::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 2px;
  height: 2px; border-radius: 2px; background: var(--brand);
}

/* 下拉菜单 */
.drop {
  position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%) translateY(8px);
  min-width: 220px; background: #fff; border: 1px solid var(--line);
  border-radius: 12px; box-shadow: var(--sh-lg); padding: 8px;
  opacity: 0; visibility: hidden; transition: .22s ease;
}
.menu > li:hover .drop { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.drop a {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 13px; font-size: 14px; color: var(--text-2);
  border-radius: 8px; transition: .18s;
}
.drop a:hover { background: var(--bg-soft); color: var(--brand); padding-left: 17px; }
.drop a i { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); flex-shrink: 0; }

.nav-cta { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* 移动端汉堡 */
.burger { display: none; width: 40px; height: 40px; border-radius: 9px; position: relative; }
.burger span {
  position: absolute; left: 10px; width: 20px; height: 2px; border-radius: 2px;
  background: var(--text); transition: .28s;
}
.burger span:nth-child(1) { top: 14px; }
.burger span:nth-child(2) { top: 19px; }
.burger span:nth-child(3) { top: 24px; }
.burger.on span:nth-child(1) { top: 19px; transform: rotate(45deg); }
.burger.on span:nth-child(2) { opacity: 0; }
.burger.on span:nth-child(3) { top: 19px; transform: rotate(-45deg); }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 10px; font-size: 14.5px; font-weight: 600;
  letter-spacing: .3px; transition: .25s; white-space: nowrap; position: relative;
  overflow: hidden;
}
.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; box-shadow: 0 6px 20px rgba(22, 112, 232, .3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(22, 112, 232, .42); }

.btn-cyan {
  background: linear-gradient(135deg, var(--cyan) 0%, #0ea5c4 100%);
  color: #04202b; box-shadow: 0 6px 20px rgba(34, 211, 238, .3);
}
.btn-cyan:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(34, 211, 238, .48); }

.btn-ghost { border: 1px solid var(--line-2); color: var(--text-2); background: #fff; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: var(--bg-soft); }

.btn-ghost.on-dark { border-color: rgba(255, 255, 255, .26); color: #fff; background: rgba(255, 255, 255, .06); }
.btn-ghost.on-dark:hover { background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .5); }

.btn-lg { padding: 15px 34px; font-size: 15.5px; }
.btn-sm { padding: 9px 18px; font-size: 13.5px; }

/* ==========================================================================
   区块
   ========================================================================== */
.sec { padding: 92px 0; position: relative; }
.sec-sm { padding: 62px 0; }
.sec-soft { background: var(--bg-soft); }
.sec-dark { background: var(--ink-900); color: #fff; }
.sec-dark p, .sec-dark .lead { color: rgba(255, 255, 255, .68); }
.sec-dark h2, .sec-dark h3 { color: #fff; }

.sec-head { max-width: 760px; margin-bottom: 46px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head h2 { margin-bottom: 14px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative; padding: calc(var(--nav-h) + 96px) 0 104px;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(22, 112, 232, .38), transparent 62%),
    radial-gradient(880px 520px at 8% 108%, rgba(34, 211, 238, .2), transparent 64%),
    linear-gradient(160deg, #04101f 0%, #061b33 46%, #0a2846 100%);
  color: #fff; overflow: hidden;
}
/* 科技网格 */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 62px 62px;
  mask-image: radial-gradient(circle at 50% 34%, #000 12%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 34%, #000 12%, transparent 78%);
}
/* 光晕 */
.hero::after {
  content: ""; position: absolute; width: 620px; height: 620px; border-radius: 50%;
  right: -180px; top: -200px; pointer-events: none;
  background: radial-gradient(circle, rgba(34, 211, 238, .17), transparent 66%);
}
.hero .wrap { position: relative; z-index: 2; }
.hero-inner { display: grid; grid-template-columns: 1.06fr .94fr; gap: 60px; align-items: center; }

.hero h1 { font-size: 52px; line-height: 1.16; margin-bottom: 22px; letter-spacing: -.02em; }
.hero h1 .grad {
  background: linear-gradient(100deg, var(--cyan) 0%, #6fd7ff 42%, var(--brand-light) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 17px; max-width: 560px; color: rgba(255, 255, 255, .76); margin-bottom: 34px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span {
  font-size: 13px; padding: 6px 15px; border-radius: 30px;
  background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .14);
  color: rgba(255, 255, 255, .84); backdrop-filter: blur(6px);
}

/* Hero 右侧可视化 */
.hero-visual { position: relative; }
.hero-panel {
  background: rgba(255, 255, 255, .055);
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 18px; padding: 24px; backdrop-filter: blur(14px);
  box-shadow: 0 26px 70px rgba(0, 0, 0, .34);
}
.hero-panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 15px; margin-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.hero-panel-head .t { font-size: 13.5px; font-weight: 600; color: rgba(255, 255, 255, .9); }
.dots { display: flex; gap: 6px; }
.dots i { width: 8px; height: 8px; border-radius: 50%; background: rgba(255, 255, 255, .2); }
.dots i:nth-child(1) { background: #ff5f57; }
.dots i:nth-child(2) { background: #febc2e; }
.dots i:nth-child(3) { background: #28c840; }

.hero-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hero-metric {
  background: rgba(255, 255, 255, .045); border: 1px solid rgba(255, 255, 255, .09);
  border-radius: 12px; padding: 15px 17px;
}
.hero-metric .k { font-size: 11.5px; color: rgba(255, 255, 255, .55); letter-spacing: .6px; margin-bottom: 5px; }
.hero-metric .v { font-size: 25px; font-weight: 700; color: #fff; letter-spacing: -.5px; }
.hero-metric .v small { font-size: 13px; font-weight: 500; color: var(--cyan-soft); margin-left: 3px; }
.hero-metric .b { margin-top: 9px; height: 3px; border-radius: 3px; background: rgba(255, 255, 255, .1); overflow: hidden; }
.hero-metric .b i { display: block; height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--brand-light), var(--cyan)); }

/* ==========================================================================
   卡片
   ========================================================================== */
.grid { display: grid; gap: 22px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; transition: .3s; position: relative; overflow: hidden;
}
.card::after {
  content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
  transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--sh-lg); border-color: transparent; }
.card:hover::after { transform: scaleX(1); }

.card .ico {
  width: 50px; height: 50px; border-radius: 13px; margin-bottom: 19px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(22, 112, 232, .1), rgba(34, 211, 238, .14));
  color: var(--brand);
}
.card .ico svg { width: 24px; height: 24px; }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 14.5px; line-height: 1.8; }

/* 产品卡（带图） */
.pcard {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: .32s; display: flex; flex-direction: column;
}
.pcard:hover { transform: translateY(-6px); box-shadow: var(--sh-lg); border-color: transparent; }
.pcard .thumb {
  aspect-ratio: 1 / 1; overflow: hidden; position: relative;
  background: var(--bg-soft-2); display: flex; align-items: center; justify-content: center;
}
.pcard .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.pcard:hover .thumb img { transform: scale(1.055); }
.pcard .body { padding: 24px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.pcard h3 { font-size: 18px; margin-bottom: 9px; }
.pcard p { font-size: 14px; line-height: 1.75; flex: 1; }
.pcard .more {
  margin-top: 16px; font-size: 13.5px; font-weight: 600; color: var(--brand);
  display: inline-flex; align-items: center; gap: 6px;
}
.pcard .more::after { content: "→"; transition: transform .25s; }
.pcard:hover .more::after { transform: translateX(4px); }

/* 方案卡（横版） */
.scard {
  display: grid; grid-template-columns: 42% 58%; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: .32s; min-height: 268px;
}
.scard:hover { transform: translateY(-5px); box-shadow: var(--sh-lg); border-color: transparent; }
.scard .thumb { overflow: hidden; background: var(--bg-soft-2); }
.scard .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .55s; }
.scard:hover .thumb img { transform: scale(1.06); }
.scard .body { padding: 30px 32px; display: flex; flex-direction: column; justify-content: center; }
.scard .tag {
  display: inline-block; font-size: 11.5px; font-weight: 600; letter-spacing: .8px;
  color: var(--brand); background: var(--bg-soft); border-radius: 20px;
  padding: 3px 12px; margin-bottom: 13px; align-self: flex-start;
}
.scard h3 { font-size: 20px; margin-bottom: 11px; }
.scard p { font-size: 14.5px; line-height: 1.8; margin-bottom: 17px; }
.scard ul { display: flex; flex-wrap: wrap; gap: 8px; }
.scard ul li {
  font-size: 12.5px; color: var(--text-3); background: var(--bg-soft);
  padding: 4px 11px; border-radius: 6px;
}

/* ==========================================================================
   数据条
   ========================================================================== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border-radius: var(--radius); overflow: hidden; }
.stat { background: #fff; padding: 34px 26px; text-align: center; }
.stat .n { font-size: 42px; font-weight: 700; letter-spacing: -1.5px; line-height: 1.1;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .n small { font-size: 19px; font-weight: 600; }
.stat .l { font-size: 13.5px; color: var(--text-3); margin-top: 8px; letter-spacing: .4px; }
.sec-dark .stats { background: rgba(255, 255, 255, .09); }
.sec-dark .stat { background: transparent; }
.sec-dark .stat .l { color: rgba(255, 255, 255, .55); }

/* ==========================================================================
   图片容器（强制宽高比）
   用途：原图尺寸/比例不一，裸放会导致布局失调；统一用 .fig 包裹，
        由容器决定比例，图片按 cover 裁剪，任何源图都不会变形。
   ========================================================================== */
.fig {
  position: relative; overflow: hidden; border-radius: var(--radius);
  box-shadow: var(--sh-lg); background: var(--bg-soft-2);
  display: flex; align-items: center; justify-content: center;
}
.fig > img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
.fig.r11  { aspect-ratio: 1 / 1; }
.fig.r43  { aspect-ratio: 4 / 3; }
.fig.r32  { aspect-ratio: 3 / 2; }
.fig.r169 { aspect-ratio: 16 / 9; }
@media (max-width: 760px) { .fig.r43, .fig.r32 { aspect-ratio: 4 / 3; } }

/* ==========================================================================
   特色条目 / 清单
   ========================================================================== */
.flows { display: grid; gap: 0; }
.flow-item {
  display: grid; grid-template-columns: 66px 1fr; gap: 26px;
  padding: 30px 0; border-bottom: 1px solid var(--line);
}
.flow-item:last-child { border-bottom: 0; }
.flow-item .num {
  font-size: 26px; font-weight: 700; letter-spacing: -1px;
  color: transparent; -webkit-text-stroke: 1.4px var(--brand); opacity: .65;
}
.flow-item h3 { font-size: 18px; margin-bottom: 8px; }
.flow-item p { font-size: 14.5px; }

.checks { display: grid; gap: 12px; }
.checks li { display: flex; gap: 11px; font-size: 14.5px; color: var(--text-2); line-height: 1.7; }
.checks li::before {
  content: ""; flex-shrink: 0; width: 19px; height: 19px; margin-top: 3px; border-radius: 50%;
  background: rgba(22, 112, 232, .1) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231670e8' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/12px no-repeat;
}
.checks.on-dark li { color: rgba(255, 255, 255, .74); }
.checks.on-dark li::before {
  background-color: rgba(34, 211, 238, .16);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2322d3ee' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
}

/* ==========================================================================
   页头（内页）
   ========================================================================== */
.phero {
  padding: calc(var(--nav-h) + 66px) 0 66px; position: relative; overflow: hidden;
  background:
    radial-gradient(820px 420px at 82% -18%, rgba(22, 112, 232, .34), transparent 62%),
    linear-gradient(150deg, #04101f 0%, #061b33 52%, #0a2846 100%);
  color: #fff;
}
.phero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(180deg, #000, transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
}
.phero .wrap { position: relative; z-index: 2; }
.phero h1 { font-size: 40px; margin-bottom: 14px; }
.phero p { color: rgba(255, 255, 255, .7); font-size: 16px; max-width: 680px; }

.crumb { display: flex; gap: 9px; font-size: 13px; color: rgba(255, 255, 255, .5); margin-bottom: 20px; }
.crumb a:hover { color: var(--cyan); }
.crumb span { color: rgba(255, 255, 255, .28); }

/* ==========================================================================
   内容排版（详情页）
   ========================================================================== */
.prose { max-width: 820px; }
.prose h2 { font-size: 24px; margin: 40px 0 16px; }
.prose h3 { font-size: 18px; margin: 30px 0 12px; }
.prose p { margin-bottom: 16px; font-size: 15px; line-height: 1.9; }
.prose ul { margin: 0 0 18px 0; }
.prose ul li { position: relative; padding-left: 20px; margin-bottom: 9px; color: var(--text-2); font-size: 14.5px; }
.prose ul li::before {
  content: ""; position: absolute; left: 4px; top: 11px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--brand);
}
.prose blockquote {
  border-left: 3px solid var(--brand); background: var(--bg-soft);
  padding: 16px 22px; border-radius: 0 8px 8px 0; margin: 22px 0;
  color: var(--text-2); font-size: 14.5px;
}

/* 侧栏布局 */
.side-layout { display: grid; grid-template-columns: 262px 1fr; gap: 46px; align-items: start; }
.side-nav {
  position: sticky; top: calc(var(--nav-h) + 24px);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px; box-shadow: var(--sh-sm);
}
.side-nav .st {
  font-size: 12px; font-weight: 600; letter-spacing: 1.6px; text-transform: uppercase;
  color: var(--text-3); padding: 8px 12px 12px;
}
.side-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 13px; font-size: 14px; color: var(--text-2);
  border-radius: 9px; transition: .2s;
}
.side-nav a:hover { background: var(--bg-soft); color: var(--brand); }
.side-nav a.on { background: linear-gradient(135deg, rgba(22, 112, 232, .09), rgba(34, 211, 238, .1)); color: var(--brand); font-weight: 600; }
.side-nav a::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: currentColor; opacity: .45; }

/* ==========================================================================
   表格
   ========================================================================== */
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th {
  background: var(--bg-soft); color: var(--text); font-weight: 600; text-align: left;
  padding: 13px 16px; border-bottom: 1px solid var(--line-2); font-size: 13.5px; white-space: nowrap;
}
.tbl td { padding: 13px 16px; border-bottom: 1px solid var(--line); color: var(--text-2); }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover { background: #fafcff; }

/* ==========================================================================
   CTA 区块
   ========================================================================== */
.cta {
  position: relative; overflow: hidden; border-radius: 20px; padding: 56px 60px;
  background:
    radial-gradient(700px 380px at 88% 0%, rgba(34, 211, 238, .24), transparent 62%),
    linear-gradient(140deg, #061b33 0%, #0a2846 100%);
  color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap;
}
.cta::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 52px 52px;
}
.cta > * { position: relative; z-index: 2; }
.cta h2 { font-size: 29px; margin-bottom: 10px; }
.cta p { color: rgba(255, 255, 255, .7); font-size: 15px; max-width: 560px; }
.cta .acts { display: flex; gap: 13px; flex-wrap: wrap; }

/* ==========================================================================
   页脚
   ========================================================================== */
.foot { background: var(--ink-900); color: rgba(255, 255, 255, .58); padding: 66px 0 0; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.25fr; gap: 44px; padding-bottom: 46px; }
.foot h4 { color: #fff; font-size: 14.5px; margin-bottom: 18px; letter-spacing: .5px; }
.foot .brandline { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.foot .brandline img { height: 40px; filter: brightness(1.06); }
.foot .brandline .lt { color: #fff; font-size: 16px; font-weight: 700; }
.foot .brandline .ls { display: block; font-size: 9px; letter-spacing: 2.2px; color: rgba(255, 255, 255, .4); }
.foot p { color: rgba(255, 255, 255, .5); font-size: 13.5px; line-height: 1.9; }
.foot-links li { margin-bottom: 11px; }
.foot-links a { font-size: 13.5px; transition: .2s; }
.foot-links a:hover { color: var(--cyan); padding-left: 4px; }
.foot-contact li { display: flex; gap: 11px; margin-bottom: 13px; font-size: 13.5px; align-items: flex-start; }
.foot-contact svg { width: 15px; height: 15px; margin-top: 4px; flex-shrink: 0; color: var(--cyan); }
.foot-bot {
  border-top: 1px solid rgba(255, 255, 255, .09); padding: 22px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap;
  font-size: 12.5px; color: rgba(255, 255, 255, .4);
}
.foot-bot a:hover { color: var(--cyan); }

/* ==========================================================================
   动效
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s cubic-bezier(.22,.7,.3,1), transform .7s cubic-bezier(.22,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .09s; }
.reveal.d2 { transition-delay: .18s; }
.reveal.d3 { transition-delay: .27s; }
.reveal.d4 { transition-delay: .36s; }

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

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 46px; }
  .hero h1 { font-size: 42px; }
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .side-layout { grid-template-columns: 1fr; gap: 30px; }
  .side-nav { position: static; display: flex; flex-wrap: wrap; gap: 6px; padding: 10px; }
  .side-nav .st { width: 100%; padding-bottom: 6px; }
  .side-nav a { flex: 0 0 auto; }
}

@media (max-width: 900px) {
  .menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0; max-height: 0; overflow: hidden;
    flex-direction: column; align-items: stretch; gap: 0; margin: 0; padding: 0 20px;
    background: #fff; border-bottom: 1px solid var(--line); transition: max-height .34s ease, padding .34s;
    box-shadow: var(--sh);
  }
  .menu.open { max-height: 78vh; overflow-y: auto; padding: 12px 20px 22px; }
  .menu > li > a { padding: 14px 6px; border-bottom: 1px solid var(--line); border-radius: 0; font-size: 15.5px; }
  .menu > li.active > a::after { display: none; }
  .drop {
    position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none;
    border: 0; padding: 0 0 8px 14px; min-width: 0; display: none;
  }
  .menu > li:hover .drop { transform: none; }
  .menu > li.open-sub .drop { display: block; }
  .burger { display: block; margin-left: auto; }
  .nav-cta .btn { display: none; }
}

@media (max-width: 760px) {
  body { font-size: 14.5px; }
  h1 { font-size: 34px; }
  h2 { font-size: 26px; }
  .sec { padding: 62px 0; }
  .hero { padding: calc(var(--nav-h) + 56px) 0 66px; }
  .hero h1 { font-size: 31px; }
  .hero .lead { font-size: 15.5px; }
  .phero { padding: calc(var(--nav-h) + 44px) 0 48px; }
  .phero h1 { font-size: 28px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .scard { grid-template-columns: 1fr; min-height: 0; }
  .scard .thumb { aspect-ratio: 16 / 10; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat .n { font-size: 32px; }
  .cta { padding: 38px 28px; }
  .cta h2 { font-size: 22px; }
  .foot-grid { grid-template-columns: 1fr; gap: 30px; }
  .foot-bot { flex-direction: column; text-align: center; }
  .hero-metrics { grid-template-columns: 1fr; }
  .flow-item { grid-template-columns: 44px 1fr; gap: 16px; }
}

/* 工具类 */
.tc { text-align: center; }
.mt0 { margin-top: 0; }
.mb0 { margin-bottom: 0; }
.mt24 { margin-top: 24px; }
.mt40 { margin-top: 40px; }
.mt56 { margin-top: 56px; }
.nowrap { white-space: nowrap; }