/* ============ 七星贝GEO 企业官网 - 简约大气 ============ */
:root {
  --navy-900: #081527;
  --navy-800: #0B1D33;
  --navy-700: #0F2947;
  --ink: #16233A;
  --muted: #5B677D;
  --line: #E4EAF3;
  --bg: #FFFFFF;
  --bg-alt: #F5F8FC;
  --accent: #1E9DF1;
  --accent-2: #22D3EE;
  --gold: #F5B942;
  --shadow: 0 10px 30px rgba(11, 29, 51, .08);
  --shadow-lg: 0 18px 50px rgba(11, 29, 51, .14);
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- 通用组件 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px; border: 0; cursor: pointer;
  font-size: 15px; font-weight: 600; letter-spacing: .02em;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, #1E9DF1, #22D3EE);
  box-shadow: 0 8px 22px rgba(30, 157, 241, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(30, 157, 241, .45); }
.btn-ghost { color: #fff; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.35); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,.2); transform: translateY(-2px); }
.btn-sm { padding: 9px 22px; font-size: 14px; }
.btn-block { width: 100%; }

.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-tag {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .28em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); line-height: 1.3; letter-spacing: .01em; }
.section-desc { margin-top: 14px; color: var(--muted); font-size: 16px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  padding: 18px 0; transition: background .3s ease, box-shadow .3s ease, padding .3s ease;
}
.site-header.scrolled {
  background: rgba(255,255,255,.92); backdrop-filter: blur(14px);
  box-shadow: 0 4px 20px rgba(11,29,51,.08); padding: 10px 0;
}
.header-inner { display: flex; align-items: center; gap: 32px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 40px; height: 40px; }
.brand-name { font-size: 21px; font-weight: 800; color: #fff; letter-spacing: .04em; transition: color .3s; }
.brand-name em { font-style: normal; color: var(--gold); }
.site-header.scrolled .brand-name { color: var(--ink); }
.main-nav { display: flex; gap: 6px; margin-left: auto; }
.main-nav a {
  padding: 8px 14px; border-radius: 8px; font-size: 15px; font-weight: 500;
  color: rgba(255,255,255,.85); transition: color .2s, background .2s;
}
.main-nav a:hover { color: #fff; background: rgba(255,255,255,.1); }
.site-header.scrolled .main-nav a { color: var(--muted); }
.site-header.scrolled .main-nav a:hover { color: var(--accent); background: rgba(30,157,241,.08); }
.main-nav a.active { color: var(--gold); }
.site-header.scrolled .main-nav a.active { color: var(--accent); }
.header-cta { margin-left: 4px; color: #06283E; background: linear-gradient(120deg, #FFE9C2, var(--gold)); box-shadow: 0 6px 18px rgba(245,185,66,.35); }
.header-cta:hover { background: linear-gradient(120deg, #ffdfae, #edb53a); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: transparent; border: 0; cursor: pointer; padding: 8px; margin-left: auto; }
.nav-toggle span { width: 22px; height: 2px; border-radius: 2px; background: #fff; transition: .3s; }
.site-header.scrolled .nav-toggle span { background: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, #10345A 100%);
  color: #fff; padding: 170px 0 0;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.hero-glow-1 { width: 480px; height: 480px; background: rgba(30,157,241,.35); top: -120px; right: -80px; }
.hero-glow-2 { width: 360px; height: 360px; background: rgba(34,211,238,.22); bottom: -40px; left: -100px; }
.hero-stars {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%, rgba(255,255,255,.8), transparent 60%),
    radial-gradient(1.5px 1.5px at 28% 12%, rgba(255,255,255,.6), transparent 60%),
    radial-gradient(2px 2px at 55% 18%, rgba(245,185,66,.8), transparent 60%),
    radial-gradient(1.5px 1.5px at 72% 30%, rgba(255,255,255,.7), transparent 60%),
    radial-gradient(1.5px 1.5px at 86% 14%, rgba(255,255,255,.6), transparent 60%),
    radial-gradient(2px 2px at 40% 34%, rgba(255,255,255,.45), transparent 60%),
    radial-gradient(1.5px 1.5px at 8% 44%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(1.5px 1.5px at 92% 42%, rgba(245,185,66,.6), transparent 60%);
}
.hero-waves { position: absolute; left: 0; right: 0; bottom: 92px; height: 120px; width: 100%; }
.hero-inner {
  position: relative; display: grid; grid-template-columns: 1.15fr .85fr;
  gap: 48px; align-items: center; padding-bottom: 150px;
}
.hero-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .18em;
  color: var(--accent-2); border: 1px solid rgba(34,211,238,.4); border-radius: 999px;
  padding: 6px 16px; margin-bottom: 22px; background: rgba(34,211,238,.08);
}
.hero h1 { font-size: clamp(30px, 4.4vw, 50px); line-height: 1.28; letter-spacing: .01em; }
.grad-text {
  background: linear-gradient(100deg, #22D3EE 0%, var(--gold) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin-top: 20px; color: rgba(255,255,255,.78); font-size: 16.5px; max-width: 560px; }
.hero-sub b { color: #fff; font-weight: 600; }
.hero-actions { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  margin-top: 46px; display: flex; gap: 0; flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.14); padding-top: 26px; max-width: 620px;
}
.hero-stats li { flex: 1; min-width: 120px; text-align: center; }
.hero-stats li + li { border-left: 1px solid rgba(255,255,255,.14); }
.hero-stats strong { font-size: 30px; font-weight: 800; color: var(--gold); font-variant-numeric: tabular-nums; }
.hero-stats span { display: block; margin-top: 4px; font-size: 13px; color: rgba(255,255,255,.66); }

/* 环绕平台示意 */
.hero-visual { display: flex; justify-content: center; }
.ai-orbit { position: relative; width: 330px; height: 330px; }
.orbit-ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1px dashed rgba(255,255,255,.25);
  animation: spinSlow 40s linear infinite;
}
.orbit-ring.r2 { inset: 52px; border-color: rgba(255,255,255,.16); animation-direction: reverse; animation-duration: 28s; }
@keyframes spinSlow { to { transform: rotate(360deg); } }
.orbit-core {
  position: absolute; inset: 50%; transform: translate(-50%, -50%);
  width: 118px; height: 118px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; font-weight: 800; letter-spacing: .08em; color: #fff;
  background: radial-gradient(circle at 30% 25%, #2FA8F5, #0C74C9);
  box-shadow: 0 0 0 10px rgba(47,168,245,.15), 0 0 0 22px rgba(47,168,245,.07), 0 18px 44px rgba(0,0,0,.4);
}
.ai-orbit .chip {
  position: absolute; padding: 7px 15px; border-radius: 999px;
  font-size: 13px; font-weight: 600; color: #fff; white-space: nowrap;
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.24);
  backdrop-filter: blur(6px); box-shadow: 0 6px 18px rgba(0,0,0,.25);
  animation: floatY 4.5s ease-in-out infinite;
}
.chip.c1 { top: -4px; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.chip.c2 { top: 24%; right: -58px; animation-delay: .6s; }
.chip.c3 { bottom: 24%; right: -50px; animation-delay: 1.2s; }
.chip.c4 { bottom: -10px; left: 50%; transform: translateX(-50%); animation-delay: 1.8s; }
.chip.c5 { bottom: 24%; left: -46px; animation-delay: 2.4s; }
.chip.c6 { top: 24%; left: -66px; animation-delay: 3s; }
.chip.c7 { top: 46%; left: 50%; transform: translate(-50%, -160%); animation-delay: 3.6s; opacity: .0; display: none; }
@keyframes floatY { 0%,100% { translate: 0 0; } 50% { translate: 0 -8px; } }

.platform-strip {
  position: relative; z-index: 2; margin-top: -46px; padding-bottom: 46px;
}
.platform-strip-inner {
  background: rgba(255,255,255,.10); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius);
  display: flex; align-items: center; gap: 22px; padding: 20px 28px; flex-wrap: wrap;
}
.strip-label { font-size: 13px; letter-spacing: .12em; color: rgba(255,255,255,.66); white-space: nowrap; }
.strip-items { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.strip-items span { font-size: 16px; font-weight: 700; color: #fff; letter-spacing: .02em; }
.strip-items i { width: 4px; height: 4px; border-radius: 50%; background: rgba(255,255,255,.35); }

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .25s ease, box-shadow .25s ease, border-color .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: #CBDCF0; }
.card-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(30,157,241,.12), rgba(34,211,238,.14));
  color: var(--accent); margin-bottom: 18px;
}
.card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14.5px; }

/* ---------- 优势 ---------- */
.adv {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px; overflow: hidden;
  transition: transform .25s, box-shadow .25s;
}
.adv:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.adv-num {
  font-size: 44px; font-weight: 800; line-height: 1;
  background: linear-gradient(160deg, rgba(30,157,241,.9), rgba(34,211,238,.55));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.adv h3 { margin: 14px 0 8px; font-size: 17.5px; }
.adv p { color: var(--muted); font-size: 14px; }

.compare { margin-top: 64px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.compare-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.compare-table th, .compare-table td { padding: 16px 22px; text-align: left; border-bottom: 1px solid var(--line); }
.compare-table thead th { background: var(--navy-800); color: #fff; font-weight: 600; letter-spacing: .04em; }
.compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-table tbody tr:nth-child(odd) { background: #FAFCFE; }
.compare-table td:nth-child(3), .compare-table th.hl { color: var(--accent); font-weight: 700; }
.compare-table th.hl { background: linear-gradient(90deg, #0F74C9, #1491DF); }

/* ---------- 案例 ---------- */
.case-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; display: flex; flex-direction: column; gap: 14px;
  transition: transform .25s, box-shadow .25s;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-head { display: flex; justify-content: space-between; align-items: center; }
.case-tag {
  font-size: 12.5px; font-weight: 600; color: var(--accent);
  background: rgba(30,157,241,.09); border: 1px solid rgba(30,157,241,.25);
  border-radius: 999px; padding: 4px 14px;
}
.case-dur { font-size: 12.5px; color: var(--muted); }
.case-card h3 { font-size: 18px; line-height: 1.5; }
.case-card > p { color: var(--muted); font-size: 14px; }
.case-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: auto; padding-top: 16px; border-top: 1px dashed var(--line); }
.case-metrics li { text-align: center; }
.case-metrics li:nth-child(2) { border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
.case-metrics strong { display: block; font-size: 21px; font-weight: 800; color: #143A61; font-variant-numeric: tabular-nums; white-space: nowrap; }
.case-metrics strong.up { color: #0EA05E; }
.case-metrics li span { font-size: 12px; color: var(--muted); }
.case-note { margin-top: 30px; text-align: center; color: var(--muted); font-size: 13px; }

/* ---------- 流程 ---------- */
.process-steps {
  counter-reset: step; display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 18px; position: relative;
}
.process-steps { counter-reset: step; }
.step {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 22px; text-align: center;
  transition: transform .25s, box-shadow .25s;
}
.step:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.step::after {
  content: ""; position: absolute; top: 44px; right: -15px; width: 12px; height: 12px;
  border-top: 2px solid var(--accent); border-right: 2px solid var(--accent);
  transform: rotate(45deg); opacity: .6;
}
.step:last-child::after { display: none; }
.step-no {
  width: 44px; height: 44px; margin: 0 auto 16px; border-radius: 50%;
  display: grid; place-items: center; font-size: 18px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, #1E9DF1, #22D3EE); box-shadow: 0 8px 18px rgba(30,157,241,.35);
}
.step h3 { font-size: 16.5px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 13.5px; }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: center; }
.about-media { border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-lg); }
.about-text h3 { font-size: 22px; margin-bottom: 16px; }
.about-text p { color: var(--muted); font-size: 15px; margin-bottom: 14px; }
.about-points { margin-top: 20px; display: grid; gap: 10px; }
.about-points li {
  background: var(--bg-alt); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 18px; font-size: 14.5px; color: var(--ink);
}
.about-points li b { color: var(--accent); margin-right: 8px; }

/* ---------- 联系 ---------- */
.section-contact { background: linear-gradient(180deg, var(--bg-alt), #EDF3FA); }
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: stretch; }
.qr-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: 14px;
}
.qr-img-wrap {
  padding: 14px; border-radius: 18px; background: var(--bg-alt);
  border: 1px solid var(--line); box-shadow: inset 0 0 0 6px #fff;
}
.qr-img-wrap img { width: 228px; height: 228px; }
.qr-card h3 { font-size: 19px; color: var(--ink); margin-top: 6px; }
.qr-card .qr-sub { color: var(--muted); font-size: 14px; max-width: 320px; }
.qr-card .qr-note { color: var(--muted); font-size: 12.5px; opacity: .85; max-width: 320px; margin-top: 4px; }
.contact-info {
  background: var(--navy-800); color: #fff; border-radius: var(--radius);
  padding: 36px; display: flex; flex-direction: column; gap: 22px; box-shadow: var(--shadow-lg);
}
.contact-info h3 { font-size: 19px; margin-bottom: 4px; }
.contact-info ul { display: grid; gap: 16px; }
.contact-info li { display: grid; gap: 2px; padding-bottom: 14px; border-bottom: 1px solid rgba(255,255,255,.1); }
.ci-label { font-size: 12px; letter-spacing: .14em; color: rgba(255,255,255,.55); }
.contact-info b { font-size: 16.5px; font-weight: 700; }
.contact-info small { color: rgba(255,255,255,.55); font-size: 12.5px; }
.contact-tip { margin-top: auto; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 18px 20px; }
.contact-tip b { color: var(--gold); font-size: 14px; }
.contact-tip p { margin-top: 6px; font-size: 13.5px; color: rgba(255,255,255,.78); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.82); padding: 56px 0 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-logo { font-size: 22px; }
.site-footer .brand-name { color: #fff; }
.footer-brand p { margin-top: 10px; color: rgba(255,255,255,.6); font-size: 14px; max-width: 320px; }
.footer-nav { display: flex; gap: 8px 22px; flex-wrap: wrap; align-content: center; }
.footer-nav a { font-size: 14px; color: rgba(255,255,255,.66); transition: color .2s; }
.footer-nav a:hover { color: var(--gold); }
.footer-bottom { padding: 20px 0 26px; text-align: center; }
.footer-bottom p { font-size: 12.5px; color: rgba(255,255,255,.45); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--navy-800); color: #fff; display: grid; place-items: center;
  box-shadow: var(--shadow-lg); opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .3s, transform .3s;
}
.back-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-top svg { width: 20px; height: 20px; }
.back-top:hover { background: var(--accent); }

/* ---------- 滚动渐入 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .orbit-ring, .ai-orbit .chip { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed; top: 0; right: 0; bottom: 0; width: min(78vw, 320px);
    flex-direction: column; gap: 4px; padding: 84px 22px 22px;
    background: rgba(11,29,51,.98); backdrop-filter: blur(10px);
    transform: translateX(100%); transition: transform .3s ease; margin-left: 0;
  }
  .main-nav.open { transform: none; }
  .main-nav a { color: #fff !important; font-size: 16px; padding: 13px 14px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 68px 0; }
  .hero { padding-top: 130px; }
  .hero-inner { padding-bottom: 120px; }
  .grid-3, .grid-4, .process-steps { grid-template-columns: 1fr; }
  .hero-stats li + li { border-left: 0; }
  .hero-stats { gap: 14px; }
  .hero-stats li { flex: 1 1 40%; }
  .case-metrics { grid-template-columns: repeat(3, 1fr); }
  .platform-strip-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .contact-form { padding: 26px 20px; }
  .contact-info { padding: 26px 20px; }
}