/* ============================================================
   风cloud · 企业门户网站设计系统（浅色科技感）
   风格：大留白 + 冷调蓝青科技色 + 轻玻璃质感
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --ink: #0B1B33;            /* 深蓝黑：标题 */
  --primary: #1D4ED8;       /* 主科技蓝 */
  --accent: #2563EB;        /* 强调蓝 */
  --accent-2: #06B6D4;      /* 科技青 */
  --grad: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
  --accent-soft: #EFF5FF;   /* 极浅蓝底 */
  --accent-soft-2: #E6F6FB; /* 极浅青底 */
  --bg: #FFFFFF;
  --bg-soft: #F5F8FE;       /* 交替版块：极浅蓝灰 */
  --bg-band: linear-gradient(135deg, #EEF5FF 0%, #E2F0FB 100%);
  --text: #23344D;
  --text-2: #5C6E8A;        /* 次级文字 */
  --text-3: #93A2B8;        /* 弱化文字 */
  --line: #E3EAF5;          /* 细线 */
  --radius: 14px;
  --radius-lg: 22px;
  --container: 1200px;
  --ease: cubic-bezier(.4,0,.2,1);
  --shadow-card: 0 2px 16px rgba(29,78,216,.06);
  --shadow-hover: 0 16px 44px rgba(29,78,216,.14);
}

/* ---------- Reset ---------- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img,svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul,ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input,select,textarea { font-family: inherit; font-size: 16px; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 110px 0; }
.section.soft { background: var(--bg-soft); }
.section.dark { background: var(--bg-band); color: var(--text); }
.grid { display: grid; gap: 24px; }
.flex { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }

/* ---------- Typography ---------- */
h1,h2,h3,h4 { color: var(--ink); font-weight: 600; letter-spacing: -.01em; line-height: 1.25; }
.display { font-size: clamp(40px, 5.6vw, 64px); font-weight: 700; letter-spacing: -.02em; line-height: 1.12; }
.h2 { font-size: clamp(28px, 3.4vw, 42px); line-height: 1.2; }
.h3 { font-size: 21px; }
.lead { font-size: clamp(17px, 1.6vw, 20px); color: var(--text-2); line-height: 1.7; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .14em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 16px;
}
.text-grad {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.muted { color: var(--text-2); }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { margin-top: 14px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-size: 15px; font-weight: 500;
  transition: all .28s var(--ease); white-space: nowrap; min-height: 46px;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 18px rgba(37,99,235,.22); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(37,99,235,.32); }
.btn-light { background: #fff; color: var(--accent); box-shadow: 0 6px 18px rgba(29,78,216,.14); }
.btn-light:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(29,78,216,.22); }
.btn-outline { border: 1.5px solid rgba(255,255,255,.6); color: #fff; }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.12); }
.btn-outline-dark { border: 1.5px solid var(--line); color: var(--ink); background: #fff; }
.btn-outline-dark:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 6px 18px rgba(37,99,235,.1); }
.link-arrow { color: var(--accent); font-weight: 500; font-size: 15px; display: inline-flex; align-items: center; gap: 4px; transition: gap .25s var(--ease); }
.link-arrow:hover { gap: 10px; }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-top: 32px; }

/* ---------- Navigation（毛玻璃吸顶） ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,.75);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: all .3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(255,255,255,.9); box-shadow: 0 2px 18px rgba(11,27,51,.04); }
.nav-inner { max-width: var(--container); margin: 0 auto; padding: 0 24px; height: 60px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); letter-spacing: .01em; }
.logo-mark { width: 30px; height: 30px; flex: none; }
.logo small { font-weight: 500; font-size: 10.5px; color: var(--text-3); letter-spacing: .14em; display: block; line-height: 1; margin-top: 3px; }
.nav-menu { display: flex; gap: 4px; align-items: center; }
.nav-menu a {
  padding: 8px 14px; font-size: 14.5px; color: var(--text); border-radius: 8px;
  transition: color .2s;
}
.nav-menu a:hover { color: var(--accent); }
.nav-menu a.active { color: var(--accent); font-weight: 600; }
.nav-cta { padding: 9px 20px; font-size: 14px; min-height: 40px; color:#fff !important; font-weight: 500; }
.nav-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; flex-direction: column; gap: 5px; }
.nav-toggle span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: all .3s var(--ease); }

/* ---------- Hero（浅色科技感） ---------- */
.hero {
  position: relative; background: #FCFDFF; color: var(--text);
  padding: 168px 0 120px; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(900px 520px at 82% 12%, rgba(37,99,235,.12), transparent 62%),
    radial-gradient(720px 520px at 8% 92%, rgba(6,182,212,.10), transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: 0; opacity: 1;
  background-image: linear-gradient(rgba(37,99,235,.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(37,99,235,.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 95% 85% at 50% 25%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 95% 85% at 50% 25%, #000 25%, transparent 78%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-inner { display: grid; grid-template-columns: 1.02fr .98fr; gap: 56px; align-items: center; }
.hero h1 { color: var(--ink); margin-bottom: 22px; }
.hero .lead { max-width: 530px; }
.hero-visual { position: relative; }
.hero-badges { display: flex; gap: 30px; flex-wrap: wrap; margin-top: 44px; }
.hero-badges .num { font-size: 30px; font-weight: 700; color: var(--ink); line-height: 1.1; }
.hero-badges .num span { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-badges .lbl { font-size: 13px; color: var(--text-3); margin-top: 4px; }

/* 内页页头（浅色） */
.page-hero { background: var(--bg-soft); color: var(--text); padding: 150px 0 80px; position: relative; overflow: hidden; }
.page-hero::before { content:""; position:absolute; inset:0;
  background: radial-gradient(820px 380px at 82% -10%, rgba(37,99,235,.12), transparent 60%),
              radial-gradient(600px 300px at 0% 110%, rgba(6,182,212,.08), transparent 60%); }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--ink); font-size: clamp(34px,4.4vw,52px); font-weight:700; letter-spacing:-.02em; }
.page-hero p { color: var(--text-2); max-width: 660px; margin-top: 16px; font-size: 18px; }
.breadcrumb { font-size: 13px; color: var(--text-3); margin-bottom: 22px; }
.breadcrumb a:hover { color: var(--accent); }

/* ---------- 产品视觉占位 ---------- */
.visual {
  border-radius: var(--radius-lg); overflow: hidden;
  background: linear-gradient(145deg, #F0F6FF, #DFECFB);
  border: 1px solid #D9E7F8;
  display: flex; align-items: center; justify-content: center;
  aspect-ratio: 4/3; position: relative;
  box-shadow: 0 20px 50px rgba(29,78,216,.08);
}
.visual.plain { background: #fff; box-shadow: none; }
.visual svg { width: 78%; height: auto; }
.visual-tag {
  position: absolute; left: 14px; bottom: 12px; font-size: 11px; color: var(--text-3);
  background: rgba(255,255,255,.75); padding: 3px 9px; border-radius: 6px;
}

/* ---------- Split Feature ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.split + .split { margin-top: 110px; }
.split.reverse .split-text { order: 2; }
.feature-list { margin-top: 26px; display: grid; gap: 18px; }
.feature-item { display: flex; gap: 14px; }
.feature-icon {
  flex: none; width: 40px; height: 40px; border-radius: 11px;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.feature-item:nth-child(2) .feature-icon { background: var(--accent-soft-2); color: #0891A8; }
.feature-item h4 { font-size: 16px; margin-bottom: 3px; }
.feature-item p { font-size: 14.5px; color: var(--text-2); }

/* ---------- 指标条 ---------- */
.metrics { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.metric { text-align: center; padding: 28px 16px; }
.metric .v { font-size: clamp(30px,3vw,42px); font-weight: 700; color: var(--ink); letter-spacing:-.02em; }
.metric .v span { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.metric .k { font-size: 14px; color: var(--text-2); margin-top: 6px; }
.metric + .metric { border-left: 1px solid #DCE7F6; }

/* ---------- 产品卡片矩阵 ---------- */
.tabs { display: inline-flex; gap: 4px; padding: 5px; background: #ECF2FB; border-radius: 999px; margin-bottom: 40px; }
.tab {
  padding: 9px 22px; border-radius: 999px; font-size: 14.5px; color: var(--text-2);
  transition: all .25s var(--ease); min-height: 40px;
}
.tab.active { background: #fff; color: var(--ink); font-weight: 600; box-shadow: 0 2px 10px rgba(29,78,216,.1); }
.product-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; transition: all .35s var(--ease); display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: #CFE0F7; }
.pc-media { aspect-ratio: 16/10; background: linear-gradient(145deg,#F0F6FF,#DFECFB); display:flex; align-items:center; justify-content:center; position: relative; }
.pc-media svg { width: 62%; height: auto; }
.pc-tag {
  position: absolute; top: 14px; left: 14px; font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px; background: rgba(255,255,255,.92); color: var(--accent);
}
.pc-tag.hw { color: #0891A8; background: rgba(236,254,255,.95); }
.pc-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.pc-body h3 { font-size: 18px; margin-bottom: 6px; }
.pc-body p { font-size: 14px; color: var(--text-2); flex: 1; }
.pc-foot { margin-top: 16px; display: flex; align-items: center; justify-content: space-between; gap:10px; }
.pc-spec { font-size: 13px; color: var(--text-3); }

/* ---------- 信息卡 ---------- */
.card-grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.card-grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.card-grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.info-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 28px; transition: all .3s var(--ease);
}
.info-card:hover { box-shadow: var(--shadow-card); border-color: #D3E1F6; transform: translateY(-3px); }
.info-card .ic-icon { width: 46px; height: 46px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); display:flex; align-items:center; justify-content:center; margin-bottom: 18px; }
.info-card h3 { font-size: 19px; margin-bottom: 8px; }
.info-card p { font-size: 14.5px; color: var(--text-2); }
.info-card ul { margin-top: 14px; display: grid; gap: 8px; }
.info-card ul li { font-size: 14px; color: var(--text-2); padding-left: 20px; position: relative; }
.info-card ul li::before { content: ""; position: absolute; left: 2px; top: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); }
.soft .info-card, .dark .info-card { background: #fff; }

/* ---------- Logo 墙 ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(6,1fr); gap: 16px; }
.logo-cell {
  height: 84px; border: 1px dashed #C9D9EF; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-3); font-size: 13px; background: #fff;
}

/* ---------- 参数表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.spec-table th, .spec-table td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.spec-table thead th { background: var(--bg-soft); font-weight: 600; color: var(--ink); }
.spec-table tbody th { font-weight: 500; color: var(--text); width: 24%; background: #FAFCFF; }
.spec-table td { color: var(--text-2); }
.table-wrap { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; overflow-x: auto; background:#fff; }

/* ---------- 三端徽标（设备监控详情） ---------- */
.endpoint-row { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.endpoint {
  background:#fff; border:1px solid var(--line); border-radius:var(--radius-lg); padding:28px 26px;
  transition: all .3s var(--ease);
}
.endpoint:hover { box-shadow: var(--shadow-card); transform: translateY(-3px); border-color:#D3E1F6; }
.endpoint .ep-badge { display:inline-flex; align-items:center; gap:8px; font-weight:600; color:var(--accent); font-size:15px; margin-bottom:12px; }
.endpoint h3 { font-size:19px; margin-bottom:8px; }
.endpoint p { font-size:14px; color:var(--text-2); }
.endpoint ul { margin-top:14px; display:grid; gap:8px; }
.endpoint ul li { font-size:14px; color:var(--text-2); padding-left:20px; position:relative; }
.endpoint ul li::before { content:""; position:absolute; left:2px; top:9px; width:7px; height:7px; border-radius:50%; background:var(--accent-2); }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content:""; position:absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 36px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content:""; position:absolute; left: -30px; top: 6px; width: 14px; height: 14px; border-radius:50%;
  background: #fff; border: 3px solid var(--accent);
}
.tl-year { font-weight: 700; color: var(--accent); font-size: 15px; }
.tl-item h4 { font-size: 17px; margin: 4px 0; }
.tl-item p { color: var(--text-2); font-size: 14.5px; }

/* ---------- CTA 收口（浅色） ---------- */
.cta-band {
  background: var(--bg-band);
  border: 1px solid #D8E7FA;
  border-radius: var(--radius-lg); padding: 72px 64px; text-align: center; color: var(--text);
  position: relative; overflow: hidden;
}
.cta-band::before { content:""; position:absolute; inset:0;
  background: radial-gradient(600px 300px at 50% 0%, rgba(37,99,235,.10), transparent 70%); }
.cta-band > * { position: relative; z-index: 1; }
.cta-band h2 { color: var(--ink); font-size: clamp(26px,3vw,38px); }
.cta-band p { color: var(--text-2); margin-top: 12px; font-size: 17px; }
.cta-band .btn-row { justify-content: center; margin-top: 30px; }

/* ---------- 表单 ---------- */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px; box-shadow: var(--shadow-card); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 7px; color: var(--text); }
.field label em { color: #E04F5F; font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  background: #FAFCFF; color: var(--text); transition: border-color .2s, background .2s; outline: none;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent); background: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.08); }
.form-note { font-size: 12.5px; color: var(--text-3); margin-top: 8px; }
.form-success {
  display: none; background: var(--accent-soft); border: 1px solid #C7DBFA; color: #1D4ED8;
  border-radius: 10px; padding: 14px 16px; font-size: 14.5px; margin-bottom: 18px;
}
.contact-info-list { display: grid; gap: 22px; }
.ci-item { display: flex; gap: 14px; }
.ci-item .ic { flex:none; width:42px;height:42px;border-radius:11px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center; }
.ci-item h4 { font-size: 15px; }
.ci-item p { color: var(--text-2); font-size: 14.5px; }

/* ---------- Footer（浅色） ---------- */
.footer { background: #F6F9FF; color: var(--text-2); padding: 72px 0 30px; font-size: 14px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; border-bottom: 1px solid var(--line); }
.footer h5 { color: var(--ink); font-size: 14.5px; margin-bottom: 16px; font-weight: 600; }
.footer ul { display: grid; gap: 10px; }
.footer a:hover { color: var(--accent); }
.footer .logo { color: var(--ink); margin-bottom: 14px; }
.footer-bottom { padding-top: 26px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--text-3); font-size: 13px; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease), transform .8s var(--ease); will-change: opacity, transform; }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; } .reveal.d2 { transition-delay: .16s; } .reveal.d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .section { padding: 72px 0; }
  .hero { padding: 130px 0 80px; }
  .hero-inner, .split { grid-template-columns: 1fr; gap: 40px; }
  .split.reverse .split-text { order: 0; }
  .product-grid, .card-grid-3, .endpoint-row { grid-template-columns: 1fr 1fr; }
  .card-grid-4 { grid-template-columns: 1fr 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; gap: 0; }
  .metric:nth-child(3) { border-left: none; }
  .logo-wall { grid-template-columns: repeat(3,1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 52px 28px; }
}
@media (max-width: 680px) {
  body { font-size: 15px; }
  .nav-menu {
    position: fixed; top: 60px; left: 0; right: 0; background: rgba(255,255,255,.98);
    backdrop-filter: blur(20px); flex-direction: column; align-items: stretch; gap: 0;
    padding: 10px 20px 20px; border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: all .28s var(--ease);
  }
  .nav-menu.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-menu a { padding: 13px 10px; font-size: 16px; border-bottom: 1px solid var(--line); }
  .nav-menu .btn { margin-top: 12px; }
  .nav-toggle { display: flex; }
  .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); }
  .product-grid, .card-grid-3, .form-row, .endpoint-row, .card-grid-4 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .logo-wall { grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .form-card { padding: 24px; }
  .hero-badges { gap: 20px; }
}