/* roulang page: index */
:root {
      --deep-ocean: #0A2E3F;
      --ocean-dark: #0B3B4A;
      --coral-energy: #FF6B4A;
      --coral-hover: #E55A3A;
      --gold-accent: #F0A500;
      --surface-warm: #F7F5F2;
      --surface-light: #EDF1F4;
      --card-bg: #FFFFFF;
      --text-primary: #1A2A33;
      --text-secondary: #5F6B7A;
      --text-muted: #8A94A3;
      --border-light: #D6DDE3;
      --shadow-sm: 0 2px 12px rgba(10,46,63,0.06);
      --shadow-md: 0 8px 24px rgba(10,46,63,0.12);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--surface-warm);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-primary);
    }
    a {
      transition: color var(--transition-base);
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10,46,63,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.12);
      box-shadow: 0 2px 20px rgba(0,0,0,0.15);
      transition: background var(--transition-base), backdrop-filter var(--transition-base);
      padding: 0.75rem 0;
    }
    .glass-nav.scrolled {
      background: rgba(10,46,63,0.96);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: white;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--coral-energy);
      filter: drop-shadow(0 2px 6px rgba(255,107,74,0.4));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition-base), border-color var(--transition-base);
    }
    .nav-links a:hover {
      color: var(--coral-energy);
      border-bottom-color: var(--coral-energy);
    }
    .nav-cta {
      background: rgba(255,107,74,0.2);
      border: 1px solid rgba(255,107,74,0.5);
      color: white;
      padding: 0.5rem 1.5rem;
      border-radius: 30px;
      font-weight: 600;
      transition: all var(--transition-base);
    }
    .nav-cta:hover {
      background: var(--coral-energy);
      border-color: var(--coral-energy);
      color: white;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(10,46,63,0.82) 0%, rgba(11,59,74,0.5) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content {
      max-width: 800px;
      margin-top: 2rem;
    }
    .hero-content h1 {
      font-size: 3.6rem;
      font-weight: 800;
      color: white;
      margin-bottom: 1.5rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 1.3rem;
      opacity: 0.92;
      margin-bottom: 2.5rem;
      color: rgba(255,255,255,0.9);
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--coral-energy);
      color: white;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      border: none;
      transition: all 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--coral-hover);
      transform: scale(1.02);
      color: white;
      box-shadow: 0 8px 18px rgba(255,107,74,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.18);
      color: white;
    }
    /* 通用区块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 0.75rem;
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3.5rem;
      font-size: 1.1rem;
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255,107,74,0.15);
    }
    .card-icon {
      font-size: 2.8rem;
      color: var(--coral-energy);
      margin-bottom: 1.4rem;
    }
    .card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    /* 数据条 */
    .stats-bar {
      background: var(--deep-ocean);
      border-radius: 24px;
      padding: 2.5rem 1.5rem;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--gold-accent);
    }
    .stat-label {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
    }
    /* FAQ */
    .faq-item {
      background: var(--surface-light);
      border-radius: 12px;
      margin-bottom: 1rem;
      overflow: hidden;
      transition: all 0.2s;
    }
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: #f0f4f7;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.05rem;
    }
    .faq-answer {
      padding: 0 1.8rem 1.2rem;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA区块 */
    #cta {
      background: linear-gradient(135deg, #0B3B4A, #0A2E3F);
      color: white;
    }
    #cta .section-title {
      color: white;
    }
    .footer {
      background: #0D2835;
      color: rgba(255,255,255,0.8);
      padding: 3rem 0;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--coral-energy);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.2rem;
      }
    }
    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,46,63,0.98);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
      }
      .nav-links.active {
        display: flex;
      }
      .hero-content h1 {
        font-size: 2.5rem;
      }
      .section-title {
        font-size: 2rem;
      }
      .stats-bar {
        flex-direction: column;
        gap: 1.8rem;
      }
    }
    @media (max-width: 520px) {
      .btn-group {
        flex-direction: column;
        align-items: flex-start;
      }
    }