/* roulang page: index */
:root {
      --primary: #A855F7;
      --primary-glow: rgba(168, 85, 247, 0.4);
      --accent: #F59E0B;
      --bg-dark: #0F0F0F;
      --bg-card: #1A1A1A;
      --bg-card-alt: #242424;
      --border-light: #2A2A2A;
      --text-light: #E0E0E0;
      --text-gray: #B0B0B0;
      --text-muted: #888888;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 40px;
      --shadow-glow: 0 0 20px rgba(168, 85, 247, 0.35);
      --transition: 0.25s ease;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-light);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition), transform var(--transition);
    }

    img {
      max-width: 100%;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 15, 15, 0.9);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      z-index: 999;
      padding: 16px 0;
      transition: background 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: var(--white);
    }

    .logo-icon {
      width: 12px;
      height: 12px;
      background: var(--primary);
      transform: rotate(45deg);
      border-radius: 2px;
      box-shadow: 0 0 12px var(--primary-glow);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }

    .nav-links a {
      position: relative;
      color: #CCCCCC;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a:hover::after {
      transform: translateX(-50%) scaleX(1);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(168, 85, 247, 0.4);
    }

    .btn-primary:hover {
      background: #b268ff;
      box-shadow: 0 0 26px var(--primary-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(168, 85, 247, 0.1);
      border-color: #c48aff;
      box-shadow: 0 0 16px rgba(168, 85, 247, 0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 10, 10, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 3rem;
      z-index: 1000;
      list-style: none;
    }

    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 500;
      color: var(--text-light);
      transition: color 0.2s;
    }
    .mobile-menu a:hover { color: var(--primary); }

    /* Hero */
    #hero {
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      margin-top: 80px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(15,15,15,0.55) 0%, #0F0F0F 96%);
    }

    .hero-content {
      position: relative;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
      z-index: 2;
    }

    .hero-left {
      flex: 1 1 480px;
    }

    .hero-left h1 {
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: var(--text-gray);
      max-width: 500px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-right {
      flex: 0 0 280px;
      background: rgba(26, 26, 26, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: 16px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .data-stat {
      display: flex;
      justify-content: space-between;
      align-items: end;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .live-tag {
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--primary);
      font-size: 0.8rem;
    }
    .pulse {
      width: 8px; height: 8px; background: var(--primary); border-radius: 50%; box-shadow: 0 0 8px var(--primary);
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 40px;
      line-height: 1.25;
    }
    .accent-text { color: var(--accent); }
    .primary-text { color: var(--primary); }

    /* 痛点卡片 */
    .grid-3 {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .pain-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: left;
      transition: all 0.3s;
    }
    .pain-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-5px);
    }
    .pain-card h3 { font-size: 1.4rem; margin: 12px 0 8px; }

    /* 解决方案 */
    .adv-layout {
      display: flex; gap: 50px; flex-wrap: wrap;
    }
    .adv-left {
      flex: 1;
    }
    .adv-left h2 {
      font-size: 2rem;
      border-left: 4px solid var(--primary);
      padding-left: 20px;
    }
    .adv-grid {
      flex: 1.6;
      display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
    }
    .solution-card {
      background: var(--bg-card);
      border-left: 4px solid var(--primary);
      padding: 20px;
      border-radius: 0 12px 12px 0;
      transition: 0.2s;
    }
    .solution-card:hover { border-left-width: 8px; border-color: var(--accent); }

    .glory-grid {
      display: flex; gap: 24px; flex-wrap: wrap; margin: 30px 0;
    }
    .glory-item {
      flex: 1; min-width: 200px; background: #1e1e1e; padding: 20px; border-radius: 12px;
    }

    .brands-wall {
      display: flex; flex-wrap: wrap; gap: 30px; filter: grayscale(1); opacity: 0.7; margin-top: 20px;
    }
    .brands-wall img:hover { filter: none; opacity: 1; }

    .testimonial-grid {
      display: flex; gap: 30px; flex-wrap: wrap;
    }
    .testimonial-card {
      background: #242424; border-left: 4px solid var(--primary); padding: 30px; border-radius: 0 16px 16px 0; flex:1;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600; font-size: 1.1rem; cursor: pointer; display: flex; justify-content: space-between;
    }

    .cta-section {
      background: radial-gradient(circle at center, #1a1030 0%, #0F0F0F 80%);
      text-align: center;
      border-top: 1px solid #333;
    }

    footer {
      background: #0A0A0A; padding: 50px 0 20px; color: #888;
    }
    .footer-grid {
      display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; gap: 30px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .adv-layout { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links, .btn-primary.desktop-cta { display: none; }
      .hamburger { display: flex; }
      .grid-3, .adv-grid, .footer-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
      section { padding: 60px 0; }
      .footer-grid { gap: 20px; }
    }