/* ========== Reset & Base ========== */
  *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
  :root {
    --primary: #4F6EF7;
    --primary-dark: #3A54C4;
    --primary-light: #EEF1FE;
    --accent: #00C2A8;
    --accent-warm: #FF8A3D;
    --text: #1E293B;
    --text-light: #64748B;
    --bg: #FFFFFF;
    --bg-soft: #F6F8FD;
    --bg-dark: #0F172A;
    --radius: 16px;
    --shadow: 0 8px 30px rgba(79,110,247,.10);
    --shadow-lg: 0 20px 60px rgba(79,110,247,.16);
    --transition: .3s cubic-bezier(.4,0,.2,1);
  }
  html { scroll-behavior: smooth; }
  body {
    font-family: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color: var(--text); line-height: 1.7; background: var(--bg);
    -webkit-font-smoothing: antialiased;
  }
  a { text-decoration: none; color: inherit; }
  ul { list-style: none; }
  .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

  /* ========== Navbar ========== */
  .navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,.88); backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,.06); transition: var(--transition);
  }
  .navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.06); }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
  .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 11px 24px; border-radius: 10px; font-size: 14px; font-weight: 600;
    cursor: pointer; border: none; transition: var(--transition); white-space: nowrap;
  }
  .btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; box-shadow: 0 4px 14px rgba(79,110,247,.35); }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,110,247,.45); }
  .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
  .btn-outline:hover { background: var(--primary); color: #fff; }
  .btn-light { background: rgba(255,255,255,.18); color: #fff; border: 1px solid rgba(255,255,255,.3); }
  .btn-light:hover { background: rgba(255,255,255,.28); }

  /* ========== Hero ========== */
  .hero {
    position: relative; overflow: hidden;
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #312E81 100%);
    color: #fff; padding: 160px 0 100px;
  }
  .hero::before {
    content:""; position:absolute; top:-40%; right:-20%; width:700px; height:700px;
    background: radial-gradient(circle, rgba(79,110,247,.25), transparent 70%);
    animation: float 8s ease-in-out infinite;
  }
  .hero::after {
    content:""; position:absolute; bottom:-30%; left:-10%; width:500px; height:500px;
    background: radial-gradient(circle, rgba(0,194,168,.15), transparent 70%);
    animation: float 10s ease-in-out infinite reverse;
  }
  @keyframes float { 0%,100%{transform:translate(0,0)} 50%{transform:translate(20px,-30px)} }
  .hero-inner { position: relative; z-index: 2; }
  .hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
    padding: 8px 18px; border-radius: 30px; font-size: 13px; margin-bottom: 26px;
  }
  .hero-badge .dot { width:8px; height:8px; border-radius:50%; background:var(--accent); animation: pulse 2s infinite; }
  @keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
  .hero h1 { font-size: 52px; font-weight: 900; line-height: 1.25; margin-bottom: 20px; }
  .hero h1 .gradient { background: linear-gradient(90deg, #818CF8, #2DD4BF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
  .hero p { font-size: 17px; color: rgba(255,255,255,.72); max-width: 620px; margin-bottom: 36px; }
  .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
  .hero-stats { display: flex; gap: 48px; margin-top: 56px; flex-wrap: wrap; }
  .hero-stat .num { font-size: 34px; font-weight: 800; background: linear-gradient(90deg,#818CF8,#2DD4BF); -webkit-background-clip:text; -webkit-text-fill-color:transparent; transition: transform .3s; }
  .hero-stat .num.counting { animation: numPop .5s ease; }
  @keyframes numPop { 0%{transform:scale(1)} 50%{transform:scale(1.08)} 100%{transform:scale(1)} }
  .hero-stat .label { font-size: 13px; color: rgba(255,255,255,.6); margin-top: 2px; }

  /* ========== Section Common ========== */
  .section { padding: 96px 0; }
  .section-soft { background: var(--bg-soft); }
  .section-header { text-align: center; max-width: 720px; margin: 0 auto 56px; }
  .section-tag {
    display: inline-block; background: var(--primary-light); color: var(--primary);
    padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 14px;
  }
  .section-header h2 { font-size: 36px; font-weight: 800; line-height: 1.35; margin-bottom: 14px; }
  .section-header p { color: var(--text-light); font-size: 15px; }

  /* ========== Features Grid ========== */
  .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
  .feature-card {
    background: #fff; border-radius: var(--radius); padding: 36px 30px;
    box-shadow: var(--shadow); transition: var(--transition); position: relative; overflow: hidden;
    border: 1px solid rgba(0,0,0,.04);
  }
  .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
  .feature-card .icon {
    width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
    font-size: 26px; margin-bottom: 20px;
  }
  .feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
  .feature-card p { font-size: 14px; color: var(--text-light); }
  .ic-1 { background: linear-gradient(135deg,#EEF1FE,#E0E7FF); }
  .ic-2 { background: linear-gradient(135deg,#D1FAF5,#CCFBF1); }
  .ic-3 { background: linear-gradient(135deg,#FEF3E2,#FFEDD5); }
  .ic-4 { background: linear-gradient(135deg,#FCE7F3,#FBCFE8); }
  .ic-5 { background: linear-gradient(135deg,#EDE9FE,#DDD6FE); }
  .ic-6 { background: linear-gradient(135deg,#DCFCE7,#BBF7D0); }

  /* ========== Architecture Flow ========== */
  .flow-wrap { display: flex; align-items: stretch; gap: 0; }
  .flow-step {
    flex: 1; background: #fff; border-radius: var(--radius); padding: 32px 24px;
    text-align: center; position: relative; box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,.04); transition: var(--transition);
  }
  .flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
  .flow-step .step-num {
    width: 44px; height: 44px; margin: 0 auto 16px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
    display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 800;
  }
  .flow-step h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
  .flow-step p { font-size: 13px; color: var(--text-light); }
  .flow-arrow { display: flex; align-items: center; padding: 0 6px; color: var(--primary); font-size: 22px; }

  /* ========== Highlight Banner ========== */
  .highlight {
    background: linear-gradient(135deg, var(--primary), #312E81);
    border-radius: 24px; padding: 52px 48px; color: #fff; position: relative; overflow: hidden;
  }
  .highlight::after { content:""; position:absolute; right:-60px; top:-60px; width:240px; height:240px; background:radial-gradient(circle,rgba(255,255,255,.08),transparent 70%); }
  .highlight-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; position: relative; z-index: 2; }
  .highlight h3 { font-size: 28px; font-weight: 800; margin-bottom: 10px; }
  .highlight p { color: rgba(255,255,255,.72); font-size: 15px; max-width: 560px; }

  /* ========== Tech Stack ========== */
  .tech-grid { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
  .tech-chip {
    background: #fff; border: 1px solid rgba(0,0,0,.06); border-radius: 12px;
    padding: 14px 22px; font-size: 14px; font-weight: 600; color: var(--text);
    display: flex; align-items: center; gap: 10px; box-shadow: 0 2px 10px rgba(0,0,0,.04);
    transition: var(--transition);
  }
  .tech-chip:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
  .tech-chip .tdot { width:10px; height:10px; border-radius:50%; background:var(--primary); }
  /* ========== Responsive ========== */
  @media (max-width: 900px) {
    .hero h1 { font-size: 38px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .flow-wrap { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); padding: 6px 0; justify-content: center; }
  }
  @media (max-width: 640px) {
    .nav-links { display: none; }
    .hero { padding: 130px 0 70px; }
    .hero h1 { font-size: 30px; }
    .hero-stats { gap: 28px; }
    .section { padding: 64px 0; }
    .section-header h2 { font-size: 27px; }
    .features-grid { grid-template-columns: 1fr; }
    .highlight { padding: 36px 26px; }
    .highlight-inner { flex-direction: column; align-items: flex-start; }
  }