/* roulang page: index */
:root {
      --primary-orange: #FF6B35;
      --primary-purple: #5B2C8E;
      --warm-yellow: #FFD166;
      --teal-green: #06D6A0;
      --bg-light: #FAFAF9;
      --card-white: #FFFFFF;
      --text-dark: #2D2D2D;
      --text-secondary: #6B6B6B;
      --border-light: #E8E5E0;
      --glass-bg: rgba(255,255,255,0.15);
      --glass-border: rgba(255,255,255,0.2);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(91,44,142,0.12);
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --radius-card: 16px;
      --radius-small: 12px;
      --radius-btn: 16px;
      --max-width: 1280px;
      --section-padding: 80px 24px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, input {
      font-family: inherit;
    }

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

    /* 导航透明玻璃 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid #E8E5E0;
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
      color: white;
      transition: color 0.3s ease;
    }
    .scrolled .logo {
      color: var(--primary-purple);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      font-size: 15px;
    }

    .nav-links a {
      color: white;
      position: relative;
      padding: 4px 0;
      transition: color 0.3s ease;
    }
    .scrolled .nav-links a {
      color: var(--text-dark);
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s ease;
    }
    .scrolled .hamburger span {
      background: var(--text-dark);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: var(--text-dark);
        font-size: 18px;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 30%, #5B2C8E 100%);
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }

    .hero-bg-shapes {
      position: absolute;
      inset: 0;
      pointer-events: none;
      opacity: 0.4;
    }

    .shape {
      position: absolute;
      background: rgba(255,255,255,0.1);
      border-radius: 50%;
      animation: floatShape 25s infinite alternate ease-in-out;
    }

    .shape1 { width: 300px; height: 300px; top: -50px; left: -50px; }
    .shape2 { width: 200px; height: 200px; bottom: 20px; right: 10%; animation-duration: 20s; }
    .shape3 { width: 150px; height: 150px; top: 30%; right: 5%; background: rgba(255,209,102,0.2); }

    @keyframes floatShape {
      0% { transform: translate(0,0) rotate(0deg); }
      100% { transform: translate(20px, -25px) rotate(15deg); }
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
      width: 100%;
    }

    .hero-left {
      flex: 1;
      color: white;
    }

    .hero-left h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      margin-bottom: 24px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.7;
      margin-bottom: 32px;
      opacity: 0.9;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF6B35, #5B2C8E);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(91,44,142,0.3);
      background: linear-gradient(135deg, #5B2C8E, #FF6B35);
    }

    .btn-glass {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(10px);
      border: 2px solid rgba(255,255,255,0.6);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-glass:hover {
      background: rgba(255,255,255,0.25);
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-height: 450px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 36px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    /* 通用区块 */
    section {
      padding: var(--section-padding);
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: transparent;
      transform: translateY(-4px);
    }

    .badge {
      background: var(--primary-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      section {
        padding: 40px 16px;
      }
      .section-title {
        font-size: 28px;
      }
    }

    /* 页脚 */
    .footer {
      background: #2D2D2D;
      color: #CCCCCC;
      padding: 60px 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover {
      color: var(--primary-orange);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-top: 12px;
    }