/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep-bg: #0A0F1E;
      --card-bg: #131A2B;
      --border-light: #1C2538;
      --text-primary: #FFFFFF;
      --text-body: #B0B8C8;
      --text-muted: #6B7280;
      --cyan: #00E5FF;
      --red: #FF4655;
      --cyan-hover: #33EAFF;
      --red-hover: #FF5E6B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-cyan: 0 8px 20px rgba(0,229,255,0.4);
      --shadow-red: 0 8px 20px rgba(255,70,85,0.4);
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
      background-color: var(--deep-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
    }
    .nav.scrolled {
      background: rgba(10, 15, 30, 0.92);
      backdrop-filter: blur(12px);
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--text-primary);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--cyan);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--deep-bg);
      font-weight: 800;
      font-size: 1rem;
    }
    .logo span {
      color: var(--cyan);
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 28px;
      height: 20px;
      justify-content: center;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }
    .hamburger span:first-child { width: 24px; }
    .hamburger span:last-child { width: 18px; }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10, 15, 30, 0.98);
      backdrop-filter: blur(16px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 999;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: var(--text-primary);
      font-size: 1.5rem;
      font-weight: 600;
      text-decoration: none;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background-image: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 0%, transparent 60%), 
                        radial-gradient(circle at 80% 20%, rgba(255,70,85,0.06) 0%, transparent 50%),
                        url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 80vh;
      display: flex;
      align-items: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10,15,30,0.7) 0%, rgba(10,15,30,0.85) 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 6vw, 4rem);
      letter-spacing: -0.02em;
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: var(--deep-bg);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--cyan-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-cyan);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-secondary:hover {
      background: rgba(0,229,255,0.08);
    }
    .btn-cta {
      background: var(--red);
      color: white;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(255,70,85,0.3);
      transition: 0.2s;
    }
    .btn-cta:hover {
      background: var(--red-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-red);
    }
    .hero-visual {
      background: rgba(19,26,43,0.6);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      padding: 20px;
      border: 1px solid rgba(255,255,255,0.08);
      font-family: var(--font-mono);
    }
    .score-mock {
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
      font-size: 1.5rem;
      font-weight: 700;
    }
    .live-badge {
      background: var(--red);
      color: white;
      padding: 2px 12px;
      border-radius: 4px;
      font-size: 0.9rem;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; } 50% { opacity: 0.6; } 100% { opacity: 1; }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-weight: 700;
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      color: var(--text-primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.06);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .card:hover {
      border-color: rgba(0,229,255,0.3);
      box-shadow: 0 8px 32px rgba(0,229,255,0.15);
    }
    /* 痛点卡片灰调 */
    .pain-card {
      background: #111827;
      border: 1px solid #1f2a3a;
    }
    /* 数据流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step::after {
      content: '';
      position: absolute;
      top: 24px;
      left: 60%;
      width: 80%;
      height: 1px;
      border-top: 2px dashed #1C2538;
      z-index: 0;
    }
    .step:last-child::after { display: none; }
    .step-icon {
      width: 48px;
      height: 48px;
      background: var(--cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      color: var(--deep-bg);
      font-weight: 700;
      position: relative;
      z-index: 1;
    }
    /* 证言 */
    .testimonial {
      background: var(--card-bg);
      border-left: 3px solid var(--cyan);
      padding: 24px;
      border-radius: 0 12px 12px 0;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      background: #1C2538;
      margin-top: 8px;
      padding: 0 16px;
      border-radius: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA */
    .cta-block {
      background: #131A2B;
      background-image: radial-gradient(circle at 50% 50%, rgba(0,229,255,0.1) 0%, transparent 70%);
      padding: 80px 0;
      text-align: center;
    }
    footer {
      background: #0A0F1E;
      padding: 60px 0 30px;
      border-top: 1px solid #1C2538;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .steps { flex-direction: column; gap: 24px; }
      .step::after { display: none; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { padding: 100px 0 40px; }
    }