/* ============ 深网科技 官网样式 ============ */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #06b6d4;
  --ink: #0f172a;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

.container { width: min(1160px, 92%); margin: 0 auto; }

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 10px;
  font-size: 15px; font-weight: 600; transition: .25s; border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(37,99,235,.35); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-ghost { color: #fff; border: 1.5px solid rgba(255,255,255,.4); }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.15); }
.btn-lg { padding: 15px 34px; font-size: 16px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: .3s;
}
.site-header.scrolled { border-bottom-color: var(--line); box-shadow: 0 4px 20px rgba(15,23,42,.06); }
.header-inner { display: flex; align-items: center; gap: 32px; height: 72px; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-size: 20px; display: grid; place-items: center;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; font-size: 17px; }
.logo-text small { font-size: 11px; font-weight: 500; color: var(--ink-soft); letter-spacing: 1px; }

.main-nav { display: flex; gap: 28px; margin-left: auto; }
.main-nav a { font-size: 15px; font-weight: 500; color: var(--ink-soft); position: relative; padding: 6px 0; }
.main-nav a:hover, .main-nav a.active { color: var(--primary); }
.main-nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; border-radius: 2px; background: var(--primary);
}
.nav-cta { padding: 9px 22px; font-size: 14px; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; margin-left: auto; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(140deg, #0b1120 0%, #101c3a 55%, #142a5c 100%);
  padding: 170px 0 110px;
}
.hero-bg { position: absolute; inset: 0; }
.grid-lines {
  position: absolute; inset: 0; opacity: .25;
  background-image:
    linear-gradient(rgba(148,163,184,.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,163,184,.12) 1px, transparent 1px);
  background-size: 56px 56px;
}
.glow { position: absolute; border-radius: 50%; filter: blur(90px); }
.glow-1 { width: 480px; height: 480px; background: rgba(37,99,235,.45); top: -140px; right: -100px; }
.glow-2 { width: 360px; height: 360px; background: rgba(6,182,212,.3); bottom: -120px; left: -80px; }

.hero-inner { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 60px; align-items: center; }
.hero-tagline {
  display: inline-block; font-size: 14px; letter-spacing: 2px;
  color: #93c5fd; border: 1px solid rgba(147,197,253,.4);
  padding: 5px 16px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(34px, 4.5vw, 54px); line-height: 1.25; font-weight: 800; }
.gradient-text {
  background: linear-gradient(90deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-desc { margin: 22px 0 32px; color: #cbd5e1; font-size: 17px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-stats { display: flex; gap: 44px; margin-top: 52px; flex-wrap: wrap; }
.stat strong { font-size: 32px; font-weight: 800; display: block; color: #fff; }
.stat span { font-size: 13px; color: #94a3b8; }

/* Hero 右侧代码卡片 */
.hero-visual { position: relative; }
.code-card {
  background: rgba(15,23,42,.75); border: 1px solid rgba(148,163,184,.25);
  border-radius: 16px; overflow: hidden; box-shadow: 0 24px 60px rgba(0,0,0,.45);
  backdrop-filter: blur(6px);
}
.code-head { display: flex; align-items: center; gap: 7px; padding: 13px 16px; background: rgba(255,255,255,.05); }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.red { background: #f87171; } .dot.yellow { background: #fbbf24; } .dot.green { background: #34d399; }
.code-title { margin-left: 10px; font-size: 12px; color: #94a3b8; }
.code-card pre { padding: 20px 22px; font-family: Consolas, "Courier New", monospace; font-size: 13.5px; line-height: 2; color: #e2e8f0; }
.c-key { color: #7dd3fc; } .c-str { color: #86efac; } .c-num { color: #fbbf24; }

.float-badge {
  position: absolute; padding: 9px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25);
  backdrop-filter: blur(8px); color: #fff; animation: floaty 5s ease-in-out infinite;
}
.badge-1 { top: -22px; right: 24px; }
.badge-2 { bottom: 40px; left: -34px; animation-delay: 1.2s; }
.badge-3 { bottom: -18px; right: 60px; animation-delay: 2.2s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }

/* ---------- 合作伙伴 ---------- */
.partners { padding: 44px 0; border-bottom: 1px solid var(--line); }
.partners-title { text-align: center; font-size: 13px; color: var(--ink-soft); letter-spacing: 2px; margin-bottom: 22px; }
.partners-row { display: flex; justify-content: center; gap: 52px; flex-wrap: wrap; }
.partners-row span { font-size: 19px; font-weight: 700; color: #94a3b8; letter-spacing: 1px; transition: .3s; }
.partners-row span:hover { color: var(--primary); }

/* ---------- 通用 Section ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-eyebrow { color: var(--primary); font-weight: 700; font-size: 14px; letter-spacing: 3px; margin-bottom: 10px; }
.section-head h2, .why-text h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; line-height: 1.3; }
.section-desc { color: var(--ink-soft); margin-top: 14px; }

/* ---------- 卡片 ---------- */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px; transition: .3s; display: block;
}
.section-alt .card { background: #fff; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(37,99,235,.4); }
.card-icon {
  width: 54px; height: 54px; border-radius: 13px; display: grid; place-items: center;
  font-size: 25px; margin-bottom: 20px;
}
.icon-blue { background: #dbeafe; } .icon-cyan { background: #cffafe; }
.icon-purple { background: #ede9fe; } .icon-orange { background: #ffedd5; }
.icon-green { background: #dcfce7; } .icon-red { background: #fee2e2; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 18px; }
.card-link { color: var(--primary); font-size: 14px; font-weight: 600; }

/* ---------- 为什么选择 ---------- */
.why-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.why-text p { color: var(--ink-soft); margin: 16px 0 24px; }
.check-list { list-style: none; margin-bottom: 32px; }
.check-list li { padding: 8px 0; font-size: 15px; color: var(--ink); }

.why-visual { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.big-number {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 20px; text-align: center; box-shadow: var(--shadow);
}
.big-number:first-child { grid-column: 1 / -1; }
.big-number strong { font-size: 40px; font-weight: 800; color: var(--primary); }
.big-number strong small { font-size: 22px; }
.big-number span { display: block; font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; }

/* ---------- 流程 ---------- */
.process-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 20px; text-align: center; position: relative; transition: .3s;
}
.step:hover { border-color: var(--primary); transform: translateY(-4px); }
.step-num {
  display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-weight: 800; font-size: 15px; margin-bottom: 16px;
}
.step h3 { font-size: 16.5px; margin-bottom: 8px; }
.step p { font-size: 13px; color: var(--ink-soft); }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(120deg, var(--primary-dark), var(--primary) 55%, var(--accent)); color: #fff; padding: 68px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 30px; margin-bottom: 8px; }
.cta-inner p { color: rgba(255,255,255,.85); }

/* ---------- 页脚 ---------- */
.site-footer { background: #0b1120; color: #94a3b8; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 44px; padding: 64px 0 48px; }
.footer-brand p { margin-top: 18px; font-size: 14px; }
.site-footer .logo-text { color: #fff; }
.site-footer .logo-text small { color: #64748b; }
.footer-col h4 { color: #e2e8f0; font-size: 15px; margin-bottom: 18px; }
.footer-col a { display: block; font-size: 14px; padding: 5px 0; transition: .2s; }
.footer-col a:hover { color: #fff; }
.footer-col p { font-size: 14px; padding: 4px 0; }
.footer-bottom { border-top: 1px solid rgba(148,163,184,.15); padding: 20px 0; font-size: 13px; }

/* ---------- 页面 Banner ---------- */
.page-banner {
  background: linear-gradient(140deg, #0b1120, #142a5c); color: #fff;
  padding: 150px 0 70px; text-align: center;
}
.page-banner h1 { font-size: clamp(30px, 4vw, 44px); font-weight: 800; }
.page-banner p { color: #94a3b8; margin-top: 12px; }

/* ---------- 服务页 ---------- */
.svc-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 72px 0; }
.svc-detail + .svc-detail { border-top: 1px solid var(--line); }
.svc-detail .svc-icon {
  width: 70px; height: 70px; border-radius: 18px; display: grid; place-items: center;
  font-size: 34px; margin-bottom: 22px;
}
.svc-detail h2 { font-size: 28px; margin-bottom: 14px; }
.svc-detail > div > p { color: var(--ink-soft); }
.svc-points { list-style: none; margin-top: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.svc-points li { font-size: 14.5px; padding-left: 24px; position: relative; }
.svc-points li::before { content: "✔"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.svc-visual {
  border-radius: 20px; min-height: 320px; display: grid; place-items: center;
  color: #fff; font-size: 84px; box-shadow: var(--shadow);
}
.sv-1 { background: linear-gradient(135deg, #1e40af, #3b82f6); }
.sv-2 { background: linear-gradient(135deg, #0e7490, #22d3ee); }
.sv-3 { background: linear-gradient(135deg, #6d28d9, #a78bfa); }
.sv-4 { background: linear-gradient(135deg, #c2410c, #fb923c); }
.sv-5 { background: linear-gradient(135deg, #15803d, #4ade80); }
.sv-6 { background: linear-gradient(135deg, #334155, #94a3b8); }

/* ---------- 案例页 ---------- */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: #fff; transition: .3s;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case-cover { height: 170px; display: grid; place-items: center; font-size: 54px; color: #fff; }
.case-body { padding: 24px; }
.case-tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--primary); background: #dbeafe; padding: 4px 12px; border-radius: 999px; margin-bottom: 12px; }
.case-body h3 { font-size: 18px; margin-bottom: 10px; }
.case-body p { font-size: 14px; color: var(--ink-soft); margin-bottom: 16px; }
.case-metric { display: flex; gap: 24px; border-top: 1px solid var(--line); padding-top: 14px; }
.case-metric div strong { display: block; color: var(--primary); font-size: 20px; font-weight: 800; }
.case-metric div span { font-size: 12px; color: var(--ink-soft); }

/* ---------- 关于页 ---------- */
.about-story { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 80px 0; }
.about-story h2 { font-size: 30px; margin-bottom: 18px; }
.about-story p { color: var(--ink-soft); margin-bottom: 14px; }
.about-visual {
  border-radius: 20px; background: linear-gradient(135deg, #0b1120, #1d4ed8);
  min-height: 340px; display: grid; place-items: center; color: rgba(255,255,255,.9);
  font-size: 100px; box-shadow: var(--shadow);
}
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.value-card { text-align: center; padding: 36px 22px; border: 1px solid var(--line); border-radius: var(--radius); transition: .3s; background: #fff; }
.value-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.value-card .v-icon { font-size: 36px; margin-bottom: 14px; }
.value-card h3 { font-size: 17px; margin-bottom: 8px; }
.value-card p { font-size: 13.5px; color: var(--ink-soft); }
.timeline { position: relative; max-width: 720px; margin: 0 auto; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item::before {
  content: ""; position: absolute; left: -33px; top: 7px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--primary); border: 3px solid #dbeafe;
}
.tl-item strong { font-size: 18px; color: var(--primary); display: block; margin-bottom: 4px; }
.tl-item p { color: var(--ink-soft); font-size: 14.5px; }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; padding: 72px 0; }
.contact-info h2 { font-size: 28px; margin-bottom: 16px; }
.contact-info > p { color: var(--ink-soft); margin-bottom: 28px; }
.info-item { display: flex; gap: 16px; margin-bottom: 22px; align-items: flex-start; }
.info-item .i-icon {
  width: 46px; height: 46px; flex: none; border-radius: 12px; background: #dbeafe;
  display: grid; place-items: center; font-size: 20px;
}
.info-item strong { display: block; font-size: 15px; }
.info-item span { font-size: 14px; color: var(--ink-soft); }

.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px; box-shadow: var(--shadow);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px;
  font-size: 14.5px; font-family: inherit; transition: .2s; background: var(--bg-alt); color: var(--ink);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-tip { font-size: 12.5px; color: #94a3b8; margin-top: 12px; text-align: center; }
.form-success {
  display: none; text-align: center; padding: 26px 0 8px;
}
.form-success .s-icon { font-size: 46px; }
.form-success h3 { margin: 10px 0 6px; }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .hero-inner, .why-grid, .svc-detail, .about-story, .contact-grid { grid-template-columns: 1fr; }
  .cards-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps, .values-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { padding: 140px 0 80px; }
  .hero-visual { max-width: 520px; }
  .svc-detail.reverse .svc-visual { order: -1; }
}

@media (max-width: 640px) {
  .cards-grid, .cases-grid, .process-steps, .values-grid,
  .footer-grid, .form-row, .why-visual, .svc-points { grid-template-columns: 1fr; }
  .main-nav {
    position: fixed; top: 72px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .35s ease;
  }
  .main-nav.open { max-height: 320px; }
  .main-nav a { padding: 15px 6%; border-top: 1px solid var(--line); }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .hero-stats { gap: 26px; }
  .float-badge { display: none; }
}