/* ============================================
   安赛泰数智科技 - 官网样式
   设计：深色科技风 + 蓝青渐变 + 玻璃拟态
   ============================================ */

:root {
  --bg: #070b1a;
  --bg-2: #0c1228;
  --bg-3: #131a38;
  --card: rgba(255, 255, 255, 0.035);
  --card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(0, 212, 255, 0.25);

  --text: #eef2ff;
  --text-muted: #8a96bd;
  --text-dim: #5c6794;

  --primary: #0066ff;
  --primary-light: #3a8eff;
  --cyan: #00d4ff;
  --purple: #7b2ff7;
  --grad: linear-gradient(135deg, #0066ff 0%, #00d4ff 100%);
  --grad-2: linear-gradient(135deg, #7b2ff7 0%, #0066ff 100%);
  --grad-text: linear-gradient(90deg, #00d4ff, #3a8eff);

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px -20px rgba(0, 102, 255, 0.35);
  --maxw: 1200px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============ Reset ============ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  font-weight: 400;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; }

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

/* ============ 背景效果 ============ */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(0, 102, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 102, 255, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
}
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.4;
  animation: float 20s ease-in-out infinite;
}
.orb-1 { width: 500px; height: 500px; background: #0066ff; top: -150px; left: -100px; }
.orb-2 { width: 400px; height: 400px; background: #7b2ff7; top: 30%; right: -120px; animation-delay: -7s; }
.orb-3 { width: 450px; height: 450px; background: #00d4ff; bottom: -100px; left: 30%; animation-delay: -14s; }
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.1); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

/* ============ 通用组件 ============ */
.glass {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 50px; font-size: 15px; font-weight: 500;
  cursor: pointer; transition: all 0.35s var(--ease); white-space: nowrap;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 8px 30px -8px rgba(0, 102, 255, 0.6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px rgba(0, 212, 255, 0.7); }
.btn-ghost {
  background: rgba(255,255,255,0.04); color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); background: rgba(0,212,255,0.06); }
.btn-block { width: 100%; }

.grad-text { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.grad-text-2 { background: linear-gradient(90deg, #b14fff, #3a8eff); -webkit-background-clip: text; background-clip: text; color: transparent; }

.section-head { text-align: center; max-width: 680px; margin: 0 auto 60px; }
.section-tag {
  display: inline-block; font-size: 13px; letter-spacing: 3px; font-weight: 700;
  color: var(--cyan); margin-bottom: 14px;
}
.section-tag.light { color: var(--cyan); }
.section-title { font-size: clamp(28px, 4vw, 42px); font-weight: 900; margin-bottom: 14px; }
.section-desc { color: var(--text-muted); font-size: 16px; }

/* 滚动入场动画 */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ============ 导航栏 ============ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0; transition: all 0.4s var(--ease);
}
.navbar.scrolled {
  background: rgba(7, 11, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }

.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { display: flex; filter: drop-shadow(0 0 10px rgba(0,212,255,0.4)); }
.logo-img { height: 40px; width: auto; object-fit: contain; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-text strong { font-size: 19px; font-weight: 900; letter-spacing: 1px; }
.logo-text small { font-size: 10px; letter-spacing: 3px; color: var(--text-dim); font-weight: 700; }

.nav-menu { display: flex; gap: 6px; }
.nav-link {
  position: relative; padding: 8px 16px; font-size: 15px; color: var(--text-muted);
  border-radius: 50px; transition: all 0.3s;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); }
.nav-link.active::after {
  content: ""; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}
.nav-cta { padding: 10px 24px; font-size: 14px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
  width: 24px; height: 2px; background: var(--text); border-radius: 2px;
  transition: all 0.3s;
}
.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); }

/* ============ Hero ============ */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 120px 24px 80px; position: relative;
}
.hero-inner { max-width: 860px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px; border-radius: 50px; font-size: 13px; color: var(--text-muted);
  background: var(--card); border: 1px solid var(--border); margin-bottom: 30px;
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan); animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero-title {
  font-size: clamp(40px, 7vw, 80px); font-weight: 900; line-height: 1.1;
  letter-spacing: -1px; margin-bottom: 28px;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 19px); color: var(--text-muted);
  max-width: 620px; margin: 0 auto 38px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 50px; }
.hero-tags {
  display: flex; gap: 28px; justify-content: center; flex-wrap: wrap;
  font-size: 14px; color: var(--text-dim);
}
.hero-tags span { transition: color 0.3s; }
.hero-tags span:hover { color: var(--cyan); }

.scroll-hint {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 44px; border: 2px solid var(--border); border-radius: 14px;
  display: flex; justify-content: center; padding-top: 8px;
}
.scroll-hint span {
  width: 4px; height: 8px; border-radius: 4px; background: var(--cyan);
  animation: scrolldot 1.8s infinite;
}
@keyframes scrolldot { 0% { opacity: 0; transform: translateY(-4px); } 50% { opacity: 1; } 100% { opacity: 0; transform: translateY(12px); } }

/* ============ 数据统计 ============ */
.stats { padding: 60px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.015); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center;
}
.stat-item { padding: 20px 10px; border-right: 1px solid var(--border); }
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: clamp(36px, 5vw, 56px); font-weight: 900;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1.1;
}
.stat-item p { color: var(--text-muted); font-size: 15px; margin-top: 8px; }

/* ============ 关于我们 ============ */
.about { padding: 110px 0; }
.about-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 50px;
}
.about-card { padding: 38px 30px; transition: all 0.4s var(--ease); }
.about-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.about-icon {
  width: 60px; height: 60px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: rgba(0,212,255,0.1); color: var(--cyan); margin-bottom: 22px;
}
.about-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.about-card p { color: var(--text-muted); font-size: 15px; }

.about-intro { padding: 50px; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 50px; align-items: center; }
.intro-text h3 { font-size: 28px; font-weight: 800; margin-bottom: 20px; }
.intro-text p { color: var(--text-muted); margin-bottom: 16px; font-size: 15px; }
.intro-list { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.intro-list li { font-size: 14px; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.intro-list .check { color: var(--cyan); font-weight: 700; }

.intro-visual { display: flex; justify-content: center; align-items: center; }
.visual-ring {
  position: relative; width: 320px; height: 320px;
  display: flex; align-items: center; justify-content: center;
}
.visual-ring::before, .visual-ring::after {
  content: ""; position: absolute; border-radius: 50%; border: 1px dashed var(--border-strong);
}
.visual-ring::before { inset: 0; animation: spin 30s linear infinite; }
.visual-ring::after { inset: 40px; border-color: var(--border); animation: spin 20s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }
.ring-core {
  width: 120px; height: 120px; border-radius: 50%;
  background: var(--grad); display: flex; flex-direction: column; align-items: center; justify-content: center;
  box-shadow: 0 0 50px rgba(0,212,255,0.5); z-index: 2;
}
.ring-core span { font-size: 18px; font-weight: 900; letter-spacing: 1px; }
.ring-core small { font-size: 11px; opacity: 0.85; }
.ring-item {
  position: absolute; font-size: 13px; font-weight: 600; color: var(--text-muted);
  background: var(--bg-2); padding: 6px 14px; border-radius: 50px; border: 1px solid var(--border);
  white-space: nowrap;
}
.ring-item.r1 { top: -8px; left: 50%; transform: translateX(-50%); }
.ring-item.r2 { top: 50%; right: -28px; transform: translateY(-50%); }
.ring-item.r3 { bottom: -8px; left: 50%; transform: translateX(-50%); }
.ring-item.r4 { top: 50%; left: -28px; transform: translateY(-50%); }
.ring-item.r5 { top: 12%; right: 8%; }

/* ============ 核心业务 ============ */
.services { padding: 110px 0; }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
  padding: 36px 30px; transition: all 0.4s var(--ease); position: relative; overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform 0.4s var(--ease);
}
.service-card:hover { transform: translateY(-6px); border-color: var(--border-strong); background: var(--card-hover); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 22px; color: #fff;
}
.service-icon.c1 { background: linear-gradient(135deg, #0066ff, #00d4ff); }
.service-icon.c2 { background: linear-gradient(135deg, #7b2ff7, #0066ff); }
.service-icon.c3 { background: linear-gradient(135deg, #00bfa6, #00d4ff); }
.service-icon.c4 { background: linear-gradient(135deg, #ff5b8a, #7b2ff7); }
.service-icon.c5 { background: linear-gradient(135deg, #ff9a3c, #ff5b8a); }
.service-icon.c6 { background: linear-gradient(135deg, #00d4ff, #00bfa6); }
.service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.service-card > p { color: var(--text-muted); font-size: 14.5px; margin-bottom: 18px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.service-tags li {
  font-size: 12px; padding: 4px 12px; border-radius: 50px;
  background: rgba(0,212,255,0.08); color: var(--cyan); border: 1px solid rgba(0,212,255,0.15);
}

/* ============ 解决方案 ============ */
.solutions { padding: 110px 0; background: rgba(255,255,255,0.012); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.tabs { max-width: 1000px; margin: 0 auto; }
.tab-list {
  display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px;
}
.tab-btn {
  padding: 11px 26px; border-radius: 50px; font-size: 15px; color: var(--text-muted);
  background: var(--card); border: 1px solid var(--border); transition: all 0.3s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: #fff; background: var(--grad); border-color: transparent; box-shadow: 0 8px 25px -8px rgba(0,102,255,0.6); }
.tab-panel { display: none; }
.tab-panel.active { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 40px; animation: fadeUp 0.5s var(--ease); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.sol-content h3 { font-size: 26px; font-weight: 800; margin-bottom: 14px; }
.sol-content > p { color: var(--text-muted); margin-bottom: 30px; font-size: 15px; }
.sol-features { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.sol-feat { display: flex; gap: 14px; }
.sol-feat .num {
  font-size: 22px; font-weight: 900; color: transparent;
  -webkit-text-stroke: 1px var(--cyan); flex-shrink: 0;
}
.sol-feat strong { font-size: 16px; display: block; margin-bottom: 4px; }
.sol-feat p { font-size: 13px; color: var(--text-muted); }
.sol-visual { display: flex; flex-direction: column; gap: 16px; justify-content: center; }
.sol-card-mini {
  padding: 26px 28px; border-radius: var(--radius-sm); background: var(--card); border: 1px solid var(--border);
  font-size: 15px; color: var(--text-muted); display: flex; align-items: center; justify-content: space-between;
  transition: all 0.3s;
}
.sol-card-mini:hover { border-color: var(--border-strong); transform: translateX(6px); }
.sol-card-mini strong { font-size: 26px; font-weight: 900; color: transparent; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; }

/* ============ 技术优势 ============ */
.advantages { padding: 110px 0; }
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.adv-item {
  padding: 38px 32px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border);
  transition: all 0.4s var(--ease); position: relative; overflow: hidden;
}
.adv-item:hover { transform: translateY(-6px); border-color: var(--border-strong); }
.adv-num {
  font-size: 52px; font-weight: 900; line-height: 1; margin-bottom: 18px;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
  opacity: 0.85;
}
.adv-item h3 { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.adv-item p { color: var(--text-muted); font-size: 14.5px; }

/* ============ 联系我们 ============ */
.contact { padding: 110px 0; }
.contact-wrap {
  display: block; max-width: 920px; margin: 0 auto; padding: 50px; text-align: center;
  background: linear-gradient(135deg, rgba(0,102,255,0.06), rgba(123,47,247,0.04));
  border-color: var(--border-strong);
}
.contact-info .section-tag { margin-bottom: 12px; }
.contact-info h2 { font-size: 30px; font-weight: 800; margin-bottom: 14px; }
.contact-info > p { color: var(--text-muted); margin-bottom: 36px; font-size: 15px; max-width: 560px; margin-left: auto; margin-right: auto; }
.contact-items {
  display: grid; grid-template-columns: 1fr 1fr; gap: 22px;
  text-align: left; max-width: 760px; margin: 0 auto;
}
.contact-item {
  display: flex; align-items: center; gap: 16px;
  padding: 20px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.025); border: 1px solid var(--border);
  transition: all 0.3s;
}
.contact-item:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.ci-icon {
  width: 46px; height: 46px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,212,255,0.1); color: var(--cyan); border: 1px solid rgba(0,212,255,0.15);
}
.contact-item small { display: block; font-size: 12px; color: var(--text-dim); }
.contact-item strong { font-size: 16px; font-weight: 600; }

/* ============ 页脚 ============ */
.footer { border-top: 1px solid var(--border); padding: 60px 0 30px; background: rgba(255,255,255,0.012); }
.footer-main {
  display: grid; grid-template-columns: 1.4fr 2fr; gap: 50px; margin-bottom: 40px; padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.footer-brand .logo { margin-bottom: 18px; }
.footer-desc { color: var(--text-muted); font-size: 14px; max-width: 340px; line-height: 1.8; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.footer-col h4 { font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text-muted); font-size: 14px; padding: 5px 0; transition: color 0.3s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
  font-size: 13px; color: var(--text-dim);
}
.footer-records {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.record-divider { color: var(--text-dim); opacity: 0.5; }
.record-police {
  display: inline-flex; align-items: center; gap: 6px;
}
.record-icon { width: 16px; height: 16px; flex-shrink: 0; }
.footer-bottom a { color: var(--text-dim); transition: color 0.3s; }
.footer-bottom a:hover { color: var(--cyan); }

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed; right: 28px; bottom: 28px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--grad); color: #fff; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 25px -6px rgba(0,102,255,0.6);
  opacity: 0; visibility: hidden; transform: translateY(20px); transition: all 0.4s var(--ease);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-3px); }

/* ============ 响应式 ============ */
@media (max-width: 968px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item:nth-child(1), .stat-item:nth-child(2) { border-bottom: 1px solid var(--border); padding-bottom: 24px; }
  .about-grid, .services-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .about-intro { grid-template-columns: 1fr; padding: 36px; }
  .tab-panel.active { grid-template-columns: 1fr; }
  .contact-items { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed; top: 0; right: -100%; width: 80%; max-width: 320px; height: 100vh;
    background: rgba(7, 11, 26, 0.97); backdrop-filter: blur(20px);
    flex-direction: column; justify-content: center; gap: 8px; padding: 40px;
    transition: right 0.4s var(--ease); border-left: 1px solid var(--border);
  }
  .nav-menu.open { right: 0; }
  .nav-link { font-size: 18px; padding: 12px 20px; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; z-index: 101; }

  .about-grid, .services-grid, .adv-grid { grid-template-columns: 1fr; }
  .sol-features { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .intro-list { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-records { justify-content: center; }
  .visual-ring { width: 260px; height: 260px; }
  .section-head { margin-bottom: 40px; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item { border-right: none !important; border-bottom: 1px solid var(--border); padding-bottom: 20px; }
  .footer-cols { grid-template-columns: 1fr; }
  .about-intro, .contact-wrap { padding: 28px 22px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; }
}