/* ==========================================================================
   中广亿安 · 官网设计系统
   风格基准：Cisco 官网设计语言（藏青 + 科技蓝、大留白、圆角卡片、克制动效）
   字体：Noto Sans SC / 思源黑体（SIL OFL 开源授权，可商用无版权风险）
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌色 */
  --navy-950: #071B33;
  --navy-900: #0D274D;
  --navy-800: #123B6E;
  --navy-700: #17509B;
  --blue-600: #0B6BB8;
  --blue-500: #0E82D4;
  --accent: #00A9E0;        /* Cisco 式亮蓝 */
  --accent-2: #45C6F5;

  /* 中性色 */
  --ink: #1C2B3A;
  --ink-2: #51606F;
  --ink-3: #8494A3;
  --line: #E4E9F0;
  --bg: #FFFFFF;
  --bg-soft: #F5F8FB;
  --bg-tint: #EDF3FA;

  /* 渐变 */
  --grad-brand: linear-gradient(118deg, #0D274D 0%, #0B5A9E 58%, #00A9E0 130%);
  --grad-deep: linear-gradient(180deg, #0A2244 0%, #071B33 100%);
  --grad-accent: linear-gradient(90deg, #0E82D4, #00A9E0);

  /* 圆角与阴影 */
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(13, 39, 77, .07);
  --shadow-md: 0 10px 30px rgba(13, 39, 77, .12);
  --shadow-lg: 0 24px 60px rgba(13, 39, 77, .18);
  --shadow-glow: 0 0 0 1px rgba(69, 198, 245, .25), 0 12px 48px rgba(0, 169, 224, .25);

  --container: 1200px;
  --header-h: 72px;
  --font: "Noto Sans SC", "Source Han Sans SC", "思源黑体", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 { margin: 0 0 .5em; color: var(--navy-900); font-weight: 700; line-height: 1.3; }
p  { margin: 0 0 1em; }
a  { color: var(--blue-600); text-decoration: none; transition: color .25s; }
a:hover { color: var(--accent); }
img, svg { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: rgba(0, 169, 224, .25); }

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

.skip-link {
  position: absolute; left: -999px; top: 8px; z-index: 999;
  background: var(--navy-900); color: #fff; padding: 8px 16px; border-radius: 8px;
}
.skip-link:focus { left: 8px; color: #fff; }

/* 数字统计使用等宽数字特性 */
.tnum { font-variant-numeric: tabular-nums; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 10px; border: 1px solid transparent;
  font-size: 15.5px; font-weight: 500; letter-spacing: .02em; line-height: 1.4;
  transition: transform .25s, box-shadow .25s, background .25s, color .25s, border-color .25s;
  white-space: nowrap; user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 17px; height: 17px; flex: none; }
.btn .arr { transition: transform .25s; }
.btn:hover .arr { transform: translateX(4px); }

.btn-primary { background: var(--blue-600); color: #fff; box-shadow: 0 8px 22px rgba(11, 107, 184, .3); }
.btn-primary:hover { background: var(--navy-800); color: #fff; box-shadow: 0 10px 26px rgba(11, 107, 184, .38); transform: translateY(-2px); }

.btn-accent { background: var(--grad-accent); color: #fff; box-shadow: 0 8px 22px rgba(0, 169, 224, .35); }
.btn-accent:hover { filter: brightness(1.06); color: #fff; transform: translateY(-2px); }

.btn-light { background: #fff; color: var(--navy-900); box-shadow: 0 10px 28px rgba(4, 20, 40, .35); }
.btn-light:hover { background: var(--bg-tint); color: var(--navy-800); transform: translateY(-2px); }

.btn-ghost { background: rgba(255, 255, 255, .06); color: #fff; border-color: rgba(255, 255, 255, .45); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255, 255, 255, .14); border-color: #fff; color: #fff; transform: translateY(-2px); }

.btn-outline { background: #fff; color: var(--navy-900); border-color: #C6D3E0; }
.btn-outline:hover { border-color: var(--blue-600); color: var(--blue-600); transform: translateY(-2px); }

.btn-sm { padding: 9px 20px; font-size: 14px; border-radius: 8px; }
.btn-lg { padding: 16px 38px; font-size: 17px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100; height: var(--header-h);
  background: rgba(255, 255, 255, .92); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s, background .3s;
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(13, 39, 77, .09); background: rgba(255, 255, 255, .97); }

.header-inner { display: flex; align-items: center; gap: 40px; height: var(--header-h); }

.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark { width: 42px; height: 42px; flex: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 21px; font-weight: 700; color: var(--navy-900); letter-spacing: .06em; }
.brand-sub { font-size: 10.5px; color: var(--ink-3); letter-spacing: .18em; font-weight: 500; }

.main-nav { display: flex; align-items: center; gap: 6px; margin-left: 8px; }
.main-nav a {
  position: relative; display: inline-flex; align-items: center; gap: 5px;
  padding: 10px 18px; font-size: 15.5px; font-weight: 500; color: var(--ink); border-radius: 8px;
}
.main-nav a:hover { color: var(--blue-600); background: var(--bg-tint); }
.main-nav a.active { color: var(--blue-600); }
.main-nav a.active::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 2px; height: 3px;
  border-radius: 3px; background: var(--grad-accent);
}

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.header-phone { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--navy-900); font-size: 16px; }
.header-phone svg { width: 18px; height: 18px; color: var(--accent); }
.header-phone:hover { color: var(--blue-600); }
.header-phone small { display: block; font-size: 11px; font-weight: 400; color: var(--ink-3); line-height: 1; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; border-radius: 2px; background: var(--navy-900); transition: .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 页面横幅（内页） ---------- */
.page-hero {
  position: relative; padding: calc(var(--header-h) + 72px) 0 64px;
  background: var(--grad-brand); color: #fff; overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='72' height='72'%3E%3Cpath d='M72 0H0v72' fill='none' stroke='%23FFFFFF' stroke-opacity='.08'/%3E%3C/svg%3E");
}
.page-hero::after {
  content: ""; position: absolute; right: -140px; top: -140px; width: 460px; height: 460px;
  border-radius: 50%; background: radial-gradient(circle, rgba(69,198,245,.35), transparent 65%);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero .crumbs { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: rgba(255,255,255,.65); margin-bottom: 14px; }
.page-hero .crumbs a { color: rgba(255,255,255,.65); }
.page-hero .crumbs a:hover { color: #fff; }
.page-hero h1 { color: #fff; font-size: clamp(28px, 4vw, 42px); letter-spacing: .02em; margin-bottom: 10px; }
.page-hero .lead { max-width: 640px; font-size: 16.5px; color: rgba(255, 255, 255, .82); margin: 0; }

/* ---------- 区块通用 ---------- */
.section { padding: 96px 0; }
.section.soft { background: var(--bg-soft); }
.section.tight { padding: 72px 0; }

.sec-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.sec-head.left { margin-left: 0; text-align: left; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13.5px; font-weight: 700; letter-spacing: .22em; color: var(--accent);
  margin-bottom: 14px;
}
.sec-eyebrow::before, .sec-head.center .sec-eyebrow::after { content: ""; width: 26px; height: 2px; border-radius: 2px; background: var(--grad-accent); }
.sec-title { font-size: clamp(24px, 3vw, 34px); letter-spacing: .01em; }
.sec-desc { font-size: 16.5px; color: var(--ink-2); margin: 0; }

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #D3DEEA; }

/* 首页产品区 4 卡 2×2 */
@media (min-width: 921px) {
  .grid-3.grid-products { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative; margin-top: var(--header-h); color: #fff; overflow: hidden;
  background: var(--grad-deep);
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .55;
  background-image:
    radial-gradient(900px 480px at 82% 12%, rgba(0, 169, 224, .28), transparent 62%),
    radial-gradient(700px 420px at 8% 88%, rgba(23, 80, 155, .4), transparent 60%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; opacity: .35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='72' height='72'%3E%3Cpath d='M72 0H0v72' fill='none' stroke='%23FFFFFF' stroke-opacity='.07'/%3E%3C/svg%3E");
  mask-image: linear-gradient(180deg, #000 55%, transparent);
}
.hero-inner {
  position: relative; z-index: 2; display: grid; grid-template-columns: 1.08fr .92fr;
  gap: 48px; align-items: center; padding: 96px 0 72px;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px; padding: 7px 16px;
  border: 1px solid rgba(120, 205, 245, .4); border-radius: 999px;
  background: rgba(0, 169, 224, .12); font-size: 13.5px; letter-spacing: .12em; color: #9ADCF8;
  margin-bottom: 26px;
}
.hero-eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 12px var(--accent-2); }
.hero h1 {
  color: #fff; font-size: clamp(34px, 5vw, 56px); font-weight: 800; line-height: 1.22; letter-spacing: .02em; margin-bottom: 22px;
}
.hero h1 em { font-style: normal; background: linear-gradient(92deg, #45C6F5, #8FE0FF); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { max-width: 560px; font-size: 17px; line-height: 1.9; color: rgba(255, 255, 255, .8); margin-bottom: 36px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 40px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.hero-points li { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255, 255, 255, .72); }
.hero-points svg { width: 16px; height: 16px; color: var(--accent-2); flex: none; }

.hero-visual { position: relative; display: grid; place-items: center; min-height: 420px; }
.hero-visual > img { width: min(430px, 88%); filter: drop-shadow(0 30px 60px rgba(2, 12, 26, .6)); animation: heroFloat 6s ease-in-out infinite; }
@keyframes heroFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

.hero-chip {
  position: absolute; display: flex; align-items: center; gap: 10px;
  padding: 12px 18px; border-radius: 14px; font-size: 13.5px; color: #EAF6FF;
  background: rgba(10, 34, 68, .72); border: 1px solid rgba(120, 205, 245, .28);
  backdrop-filter: blur(8px); box-shadow: var(--shadow-md); white-space: nowrap;
}
.hero-chip svg { width: 20px; height: 20px; color: var(--accent-2); flex: none; }
.hero-chip b { display: block; font-size: 14.5px; color: #fff; }
.chip-1 { top: 8%; left: 2%; animation: heroFloat 7s 0.6s ease-in-out infinite; }
.chip-2 { bottom: 16%; left: -2%; animation: heroFloat 8s 1.1s ease-in-out infinite; }
.chip-3 { top: 34%; right: -2%; animation: heroFloat 6.5s 0.3s ease-in-out infinite; }

.hero-stats { position: relative; z-index: 2; border-top: 1px solid rgba(255, 255, 255, .12); background: rgba(5, 20, 40, .45); backdrop-filter: blur(8px); }
.hero-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.hero-stat { padding: 30px 24px; text-align: center; border-left: 1px solid rgba(255, 255, 255, .1); }
.hero-stat:first-child { border-left: 0; }
.hero-stat .num { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; color: #fff; letter-spacing: .02em; }
.hero-stat .num span { color: var(--accent-2); font-size: .6em; margin-left: 2px; }
.hero-stat .lab { font-size: 13.5px; color: rgba(255, 255, 255, .62); letter-spacing: .08em; margin-top: 4px; }

/* ---------- 产品卡片 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.product-card { display: flex; flex-direction: column; }
.product-media {
  position: relative; aspect-ratio: 4 / 3; display: grid; place-items: center; padding: 30px;
  background:
    radial-gradient(340px 220px at 70% 20%, rgba(0, 169, 224, .12), transparent 65%),
    linear-gradient(160deg, #F3F8FD, #E7EFF8);
  border-bottom: 1px solid var(--line); overflow: hidden;
}
.product-media img { width: 78%; max-height: 86%; object-fit: contain; transition: transform .45s ease; }
.product-card:hover .product-media img { transform: scale(1.06); }
.product-media .tag {
  position: absolute; top: 16px; left: 16px; padding: 5px 12px; border-radius: 999px;
  background: rgba(13, 39, 77, .82); color: #fff; font-size: 12px; letter-spacing: .06em;
}
/* 整幅照片铺满媒体区（实拍图用，避免照片白底与面板底色冲突） */
.product-media.media-photo { padding: 0; }
.product-media.media-photo img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; border-radius: 0; box-shadow: none;
}

/* 「新品上市」徽标（放正文文字区，不压图片） */
.new-flag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 600; letter-spacing: .1em;
  background: var(--grad-accent); color: #fff; box-shadow: 0 4px 12px rgba(0, 169, 224, .32);
  margin-bottom: 14px;
}

/* 产品页白底视觉面板（实拍图用） */
.p-visual.plain {
  background: linear-gradient(160deg, #FFFFFF, #F0F5FA);
  border: 1px solid var(--line);
}
.p-visual.plain img { width: 92%; }
.product-body { padding: 26px 28px 28px; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 20px; margin-bottom: 8px; }
.product-body h3 a { color: inherit; }
.product-body h3 a:hover { color: var(--blue-600); }
.product-body > p { color: var(--ink-2); font-size: 15px; margin-bottom: 16px; flex: 1; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.chip {
  padding: 4px 12px; border-radius: 999px; font-size: 12.5px; color: var(--blue-600);
  background: var(--bg-tint); border: 1px solid #D7E5F2; white-space: nowrap;
}
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 15px; color: var(--blue-600); }
.link-arrow svg { width: 16px; height: 16px; transition: transform .25s; }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---------- 方案卡片（深色叠字） ---------- */
.solution-card { position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); aspect-ratio: 3 / 3.3; display: flex; align-items: flex-end; }
.solution-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 62%; transition: transform .6s ease; }
.solution-card:hover img { transform: scale(1.06); }
.solution-card .veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7, 27, 51, .05) 30%, rgba(7, 27, 51, .88) 88%);
}
.solution-card .body { position: relative; padding: 28px; color: #fff; }
.solution-card .k { display: inline-block; font-size: 12.5px; letter-spacing: .18em; color: #8FD8F7; margin-bottom: 10px; }
.solution-card h3 { color: #fff; font-size: 21px; margin-bottom: 8px; }
.solution-card p { font-size: 14px; color: rgba(255, 255, 255, .78); margin: 0 0 14px; }
.solution-card .go { display: inline-flex; align-items: center; gap: 6px; color: #8FD8F7; font-size: 14px; font-weight: 600; }
.solution-card .go svg { width: 15px; height: 15px; }

/* ---------- 品牌形象大图 ---------- */
.brand-band { position: relative; overflow: hidden; background: var(--grad-deep); color: #fff; }
.brand-band::before {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background-image:
    radial-gradient(760px 420px at 85% 6%, rgba(0, 169, 224, .22), transparent 60%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='72' height='72'%3E%3Cpath d='M72 0H0v72' fill='none' stroke='%23FFFFFF' stroke-opacity='.06'/%3E%3C/svg%3E");
}
.brand-band .container { position: relative; }
.brand-band .sec-head { margin-bottom: 44px; }
.brand-band .sec-eyebrow { color: #8FD8F7; }
.brand-band .sec-title { color: #fff; }
.brand-band .sec-desc { color: rgba(255, 255, 255, .75); }

.brand-frame {
  position: relative; border-radius: 20px; overflow: hidden;
  border: 1px solid rgba(120, 205, 245, .3); box-shadow: var(--shadow-glow), var(--shadow-lg);
}
.brand-frame img { display: block; width: 100%; }
.brand-frame .cap {
  position: absolute; left: 22px; bottom: 18px; padding: 7px 16px; border-radius: 999px;
  background: rgba(5, 18, 36, .62); color: rgba(255, 255, 255, .85); font-size: 12.5px;
  letter-spacing: .08em; backdrop-filter: blur(6px);
}
.brand-band .band-note { text-align: center; font-size: 12px; color: rgba(255, 255, 255, .38); margin: 20px 0 0; }

/* ---------- 优势图标卡 ---------- */
.feature-card { padding: 34px 30px; }
.feature-icon {
  width: 58px; height: 58px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 20px;
  background: linear-gradient(140deg, rgba(14, 130, 212, .12), rgba(0, 169, 224, .16));
  border: 1px solid #CFE6F5; color: var(--blue-600);
}
.feature-icon svg { width: 28px; height: 28px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { font-size: 14.5px; color: var(--ink-2); margin: 0; }

/* ---------- 资讯卡片 ---------- */
.news-card .news-media { aspect-ratio: 16 / 9.4; overflow: hidden; border-bottom: 1px solid var(--line); }
.news-card .news-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.news-card:hover .news-media img { transform: scale(1.05); }
.news-body { padding: 24px 26px 26px; }
.news-meta { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--ink-3); margin-bottom: 10px; }
.news-meta .cat { padding: 3px 10px; border-radius: 999px; background: rgba(0, 169, 224, .1); color: var(--blue-600); font-weight: 600; }
.news-body h3 { font-size: 17.5px; line-height: 1.5; margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-body h3 a { color: var(--ink); }
.news-body h3 a:hover { color: var(--blue-600); }
.news-body p { font-size: 14px; color: var(--ink-2); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- 合作高校走马灯 ---------- */
.logo-strip { overflow: hidden; position: relative; padding: 10px 0; }
.logo-strip::before, .logo-strip::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 120px; z-index: 2; pointer-events: none;
}
.logo-strip::before { left: 0; background: linear-gradient(90deg, #fff, transparent); }
.logo-strip::after { right: 0; background: linear-gradient(-90deg, #fff, transparent); }
.logo-track { display: flex; gap: 20px; width: max-content; animation: marquee 36s linear infinite; }
.logo-strip:hover .logo-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
.logo-pill {
  display: flex; align-items: center; gap: 12px; padding: 14px 26px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff; box-shadow: var(--shadow-sm);
  white-space: nowrap; transition: border-color .3s, box-shadow .3s;
}
.logo-pill:hover { border-color: #BFD7EA; box-shadow: var(--shadow-md); }
.logo-pill img { width: 40px; height: 40px; object-fit: contain; }
.logo-pill span { font-size: 15.5px; font-weight: 600; color: var(--navy-900); }

/* ---------- CTA 横幅 ---------- */
.cta-band { position: relative; overflow: hidden; background: var(--grad-brand); color: #fff; }
.cta-band::after {
  content: ""; position: absolute; right: -120px; bottom: -180px; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(69, 198, 245, .3), transparent 65%);
}
.cta-inner { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 32px; padding: 64px 0; flex-wrap: wrap; }
.cta-inner h2 { color: #fff; font-size: clamp(24px, 3vw, 32px); margin-bottom: 8px; }
.cta-inner p { color: rgba(255, 255, 255, .8); margin: 0; font-size: 16px; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy-950); color: rgba(255, 255, 255, .72); font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.35fr .8fr .8fr .9fr 1fr; gap: 40px; padding: 72px 0 56px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-sub { color: rgba(255, 255, 255, .45); }
.footer-brand p { margin-top: 18px; color: rgba(255, 255, 255, .58); font-size: 13.5px; line-height: 1.9; }
.footer-col h4 { color: #fff; font-size: 15.5px; letter-spacing: .08em; margin-bottom: 20px; }
.footer-col li { margin-bottom: 12px; }
.footer-col a { color: rgba(255, 255, 255, .62); font-size: 14px; }
.footer-col a:hover { color: var(--accent-2); }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 14px; color: rgba(255, 255, 255, .62); font-size: 13.5px; line-height: 1.7; }
.footer-contact svg { width: 16px; height: 16px; color: var(--accent-2); flex: none; margin-top: 4px; }
.footer-qr { display: flex; gap: 14px; align-items: flex-start; }
.footer-qr img { width: 92px; height: 92px; border-radius: 10px; background: #fff; padding: 5px; }
.footer-qr span { font-size: 12.5px; color: rgba(255, 255, 255, .55); line-height: 1.7; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 22px 0; }
.footer-bottom .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: rgba(255, 255, 255, .42); }
.footer-bottom a { color: rgba(255, 255, 255, .42); }
.footer-bottom a:hover { color: var(--accent-2); }

/* ---------- 产品页 ---------- */
.product-section { padding: 88px 0; scroll-margin-top: calc(var(--header-h) + 76px); }
.product-section:nth-of-type(even) { background: var(--bg-soft); }
.product-intro { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: center; margin-bottom: 56px; }
.product-intro.flip .p-visual { order: 2; }
.p-visual {
  position: relative; border-radius: 20px; padding: 44px; display: grid; place-items: center; min-height: 380px;
  background:
    radial-gradient(400px 260px at 72% 18%, rgba(0, 169, 224, .14), transparent 62%),
    linear-gradient(160deg, #F3F8FD, #E4EDF7);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.p-visual img { width: 84%; border-radius: 14px; filter: drop-shadow(0 22px 40px rgba(13, 39, 77, .18)); }
.p-visual .badge {
  position: absolute; top: 20px; left: 20px; padding: 6px 14px; border-radius: 999px;
  background: rgba(13, 39, 77, .85); color: #fff; font-size: 12.5px; letter-spacing: .08em;
}
.p-copy .sec-eyebrow { margin-bottom: 10px; }
.p-copy h2 { font-size: clamp(24px, 3vw, 32px); }
.p-copy .p-desc { color: var(--ink-2); font-size: 15.5px; }
.p-points { margin: 22px 0 28px; display: grid; gap: 12px; }
.p-points li { display: flex; gap: 12px; font-size: 15px; color: var(--ink); }
.p-points svg { width: 20px; height: 20px; color: var(--accent); flex: none; margin-top: 3px; }
.p-points b { color: var(--navy-900); }

/* 参数表 */
.spec-block h3 { font-size: 20px; margin-bottom: 6px; }
.spec-block .spec-note { font-size: 13px; color: var(--ink-3); margin-bottom: 22px; }
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.spec-table th, .spec-table td { padding: 15px 22px; font-size: 14.5px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th { width: 220px; color: var(--navy-900); font-weight: 600; background: var(--bg-soft); white-space: nowrap; }
.spec-table td { color: var(--ink-2); }

/* 平台功能网格 */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 34px; }
.feat-item { display: flex; gap: 16px; padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; transition: transform .3s, box-shadow .3s; }
.feat-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feat-item svg { width: 30px; height: 30px; color: var(--blue-600); flex: none; margin-top: 2px; }
.feat-item h4 { font-size: 16px; margin-bottom: 5px; }
.feat-item p { font-size: 13.5px; color: var(--ink-2); margin: 0; }

/* 产品锚点导航 */
.subnav { position: sticky; top: var(--header-h); z-index: 60; background: rgba(255, 255, 255, .95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.subnav-inner { display: flex; gap: 8px; overflow-x: auto; padding: 14px 0; scrollbar-width: none; }
.subnav-inner::-webkit-scrollbar { display: none; }
.subnav a {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; border-radius: 999px;
  font-size: 14.5px; font-weight: 500; color: var(--ink-2); border: 1px solid var(--line); background: #fff; white-space: nowrap;
  transition: .25s;
}
.subnav a svg { width: 17px; height: 17px; }
.subnav a:hover { color: var(--blue-600); border-color: #BFD7EA; }
.subnav a.active { background: var(--navy-900); border-color: var(--navy-900); color: #fff; }

/* ---------- 解决方案页 ---------- */
.seg-wrap { position: sticky; top: var(--header-h); z-index: 60; background: rgba(245, 248, 251, .95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.seg-tabs { display: flex; justify-content: center; gap: 12px; padding: 16px 0; flex-wrap: wrap; }
.seg-btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 12px 28px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; font-size: 15px; font-weight: 600; color: var(--ink-2);
  transition: .3s;
}
.seg-btn svg { width: 19px; height: 19px; }
.seg-btn:hover { color: var(--blue-600); border-color: #B9D4EA; }
.seg-btn.active { background: var(--grad-brand); color: #fff; border-color: transparent; box-shadow: 0 8px 22px rgba(13, 39, 77, .28); }

.sol-panel { display: none; }
.sol-panel.active { display: block; animation: fadeUp .5s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

.sol-banner {
  position: relative; border-radius: 20px; overflow: hidden; min-height: 380px;
  display: flex; align-items: flex-end; margin: 56px 0; box-shadow: var(--shadow-md); color: #fff;
}
.sol-banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 58%; }
.sol-banner .veil { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(7,27,51,.1) 20%, rgba(7,27,51,.86) 92%); }
.sol-banner .body { position: relative; padding: 40px 44px; max-width: 720px; }
.sol-banner .k { font-size: 13px; letter-spacing: .2em; color: #8FD8F7; margin-bottom: 10px; display: block; }
.sol-banner h2 { color: #fff; font-size: clamp(22px, 2.8vw, 30px); margin-bottom: 10px; }
.sol-banner p { margin: 0; font-size: 15px; color: rgba(255, 255, 255, .82); }

.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pain-card { padding: 26px 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-sm); transition: transform .3s, box-shadow .3s; }
.pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.pain-card .no { font-size: 13px; font-weight: 800; color: var(--accent); letter-spacing: .14em; margin-bottom: 10px; }
.pain-card h4 { font-size: 16px; margin-bottom: 6px; }
.pain-card p { font-size: 13.5px; color: var(--ink-2); margin: 0; }

/* 架构图 */
.arch { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-radius: 18px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-sm); background: #fff; }
.arch-layer { padding: 30px 26px; border-left: 1px solid var(--line); position: relative; }
.arch-layer:first-child { border-left: 0; }
.arch-layer .lv { font-size: 12px; letter-spacing: .18em; color: var(--accent); font-weight: 700; margin-bottom: 12px; }
.arch-layer h4 { font-size: 17px; margin-bottom: 12px; }
.arch-layer ul { display: grid; gap: 8px; }
.arch-layer li { font-size: 13.5px; color: var(--ink-2); padding-left: 16px; position: relative; }
.arch-layer li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; border-radius: 2px; background: var(--grad-accent); }
.arch-layer:nth-child(1) { background: linear-gradient(180deg, #F6FAFE, #EDF4FB); }

/* 方案价值 */
.value-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; background: var(--grad-deep); border-radius: 20px; padding: 44px; color: #fff; position: relative; overflow: hidden; }
.value-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(500px 260px at 85% 0%, rgba(0,169,224,.3), transparent 60%); }
.value-item { position: relative; text-align: center; padding: 8px 12px; }
.value-item + .value-item { border-left: 1px solid rgba(255, 255, 255, .14); }
.value-item .num { font-size: clamp(26px, 3vw, 36px); font-weight: 800; color: #fff; }
.value-item .num span { color: var(--accent-2); font-size: .62em; }
.value-item .lab { font-size: 13.5px; color: rgba(255, 255, 255, .66); margin-top: 6px; }

/* 流程步骤 */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding: 26px 22px; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-sm); }
.step .ico { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--bg-tint); color: var(--blue-600); margin-bottom: 16px; }
.step .ico svg { width: 24px; height: 24px; }
.step h4 { font-size: 15.5px; margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--ink-2); margin: 0; }

/* ---------- 联系我们 ---------- */
.net-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-bottom: 48px; }
.net-stat { padding: 30px 26px; text-align: center; }
.net-stat .num { font-size: clamp(26px, 3vw, 36px); font-weight: 800; color: var(--navy-900); }
.net-stat .num span { color: var(--accent); font-size: .6em; margin-left: 2px; }
.net-stat .lab { font-size: 14px; color: var(--ink-2); margin-top: 4px; }

.map-wrap { position: relative; border-radius: 20px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-sm); background: #fff; }
.map-wrap img { width: 100%; }
.map-note { padding: 18px 26px; font-size: 13px; color: var(--ink-3); border-top: 1px solid var(--line); background: var(--bg-soft); }

.region-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.region-card { display: flex; align-items: center; gap: 16px; padding: 22px 24px; }
.region-card .ico { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--bg-tint); color: var(--blue-600); flex: none; }
.region-card .ico svg { width: 22px; height: 22px; }
.region-card h4 { font-size: 16px; margin-bottom: 3px; }
.region-card p { margin: 0; font-size: 13px; color: var(--ink-2); }

/* 高校案例 */
.case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.case-card { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 30px 20px 26px; gap: 14px; }
.case-card img { width: 88px; height: 88px; object-fit: contain; }
.case-card span { font-size: 15.5px; font-weight: 600; color: var(--navy-900); line-height: 1.5; }
.case-card small { font-size: 12px; color: var(--ink-3); }

/* 联系方式 */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.contact-card { padding: 32px 28px; text-align: left; }
.contact-card .ico { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: var(--grad-brand); color: #fff; margin-bottom: 20px; box-shadow: 0 8px 20px rgba(13, 39, 77, .25); }
.contact-card .ico svg { width: 24px; height: 24px; }
.contact-card h4 { font-size: 16px; margin-bottom: 6px; }
.contact-card .val { font-size: 17px; font-weight: 700; color: var(--navy-900); letter-spacing: .02em; word-break: break-all; }
.contact-card .tip { font-size: 13px; color: var(--ink-3); margin-top: 6px; }

.contact-layout { display: grid; grid-template-columns: 1.25fr .75fr; gap: 28px; margin-top: 28px; }
.form-card { padding: 40px 44px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--navy-900); margin-bottom: 8px; }
.field label i { color: #E5484D; font-style: normal; margin-left: 2px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 16px; border: 1px solid #C9D5E2; border-radius: 10px;
  font-family: inherit; font-size: 14.5px; color: var(--ink); background: #fff;
  transition: border-color .25s, box-shadow .25s;
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0, 169, 224, .16);
}
.form-foot { display: flex; align-items: center; gap: 16px; margin-top: 24px; flex-wrap: wrap; }
.form-foot .hint { font-size: 12.5px; color: var(--ink-3); }

.qr-card { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 40px 30px; gap: 18px; }
.qr-card img { width: 190px; height: 190px; border-radius: 14px; box-shadow: var(--shadow-sm); }
.qr-card h4 { font-size: 17px; margin: 0; }
.qr-card p { font-size: 13.5px; color: var(--ink-2); margin: 0; }

/* ---------- 弹窗 ---------- */
.modal { position: fixed; inset: 0; z-index: 200; display: none; }
.modal.open { display: block; }
.modal .mask { position: absolute; inset: 0; background: rgba(5, 14, 26, .78); backdrop-filter: blur(6px); }
.modal .dialog {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: min(920px, calc(100% - 48px)); aspect-ratio: 16 / 9; border-radius: 18px; overflow: hidden;
  background: var(--navy-950); box-shadow: var(--shadow-lg);
  display: grid; place-items: center; color: rgba(255, 255, 255, .7); font-size: 15px; letter-spacing: .1em;
}
.modal .close {
  position: absolute; top: 14px; right: 14px; z-index: 2; width: 40px; height: 40px; border-radius: 50%;
  border: 0; background: rgba(255, 255, 255, .14); color: #fff; font-size: 20px; line-height: 1;
  display: grid; place-items: center; transition: background .25s;
}
.modal .close:hover { background: rgba(255, 255, 255, .3); }

/* ---------- 其他组件 ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 90; width: 48px; height: 48px; border-radius: 50%;
  border: 0; background: var(--navy-900); color: #fff; display: grid; place-items: center;
  box-shadow: var(--shadow-md); opacity: 0; pointer-events: none; transform: translateY(14px);
  transition: .35s;
}
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { background: var(--blue-600); }
.to-top svg { width: 20px; height: 20px; }

/* 滚动入场动画 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .grid-4, .case-grid, .contact-grid, .pain-grid { grid-template-columns: repeat(2, 1fr); }
  .arch { grid-template-columns: repeat(2, 1fr); }
  .arch-layer { border-top: 1px solid var(--line); }
  .arch-layer:nth-child(odd) { border-left: 0; }
  .value-band { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .value-item:nth-child(3) { border-left: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 920px) {
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 4px; padding: 16px 24px 24px;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 12px; font-size: 16px; border-radius: 10px; }
  .main-nav a.active::after { display: none; }
  .nav-toggle { display: flex; }
  .header-phone { display: none; }

  .hero-inner { grid-template-columns: 1fr; padding: 64px 0 56px; gap: 40px; text-align: left; }
  .hero-visual { min-height: 320px; }
  .hero-visual > img { width: min(340px, 80%); }
  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stat { border-left: 0; border-top: 1px solid rgba(255, 255, 255, .1); }
  .hero-stat:nth-child(-n+2) { border-top: 0; }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .product-intro { grid-template-columns: 1fr; gap: 36px; }
  .product-intro.flip .p-visual { order: 0; }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .region-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-layout { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
}

@media (max-width: 620px) {
  .container { width: calc(100% - 36px); }
  .grid-4, .case-grid, .contact-grid, .pain-grid, .feat-grid, .region-grid,
  .form-grid, .steps, .arch, .value-band { grid-template-columns: 1fr; }
  .arch-layer { border-left: 0; }
  .value-item + .value-item { border-left: 0; border-top: 1px solid rgba(255,255,255,.14); padding-top: 22px; }
  .hero-chip { display: none; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .form-card { padding: 28px 22px; }
  .sol-banner .body { padding: 26px; }
  .spec-table th { width: 128px; }
  .spec-table th, .spec-table td { padding: 12px 14px; font-size: 13.5px; }
}