/* roulang page: index */
:root {
      --deep-charcoal: #1A1A1A;
      --champion-gold: #D4AF37;
      --bright-gold: #E5C158;
      --competition-red: #C62828;
      --light-gray: #F5F5F5;
      --white: #FFFFFF;
      --medium-gray: #B0B0B0;
      --text-dark: #2A2A2A;
      --text-muted: #5C5C5C;
      --border-light: rgba(255,255,255,0.1);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-hover: 0 16px 36px rgba(212, 175, 55, 0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.25s ease;
      --container: 1280px;
      --section-gap: 100px;
    }

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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.65;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }

    .nav-bar.scrolled {
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.25);
    }

    .nav-container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--champion-gold);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-transform: uppercase;
      font-family: 'Inter', sans-serif;
    }
    .logo i {
      font-size: 2rem;
      color: var(--champion-gold);
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--champion-gold);
      transition: width 0.25s;
    }

    .nav-links a:hover {
      color: var(--champion-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(26,26,26,0.96);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        align-items: flex-start;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 按钮 */
    .btn-primary {
      background: var(--champion-gold);
      color: var(--deep-charcoal);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 4px;
      display: inline-block;
      letter-spacing: 0.5px;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(212,175,55,0.3);
    }
    .btn-primary:hover {
      background: var(--bright-gold);
      box-shadow: 0 8px 22px rgba(212,175,55,0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--white);
      color: var(--white);
      font-weight: 600;
      padding: 12px 34px;
      border-radius: 4px;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(212,175,55,0.2);
      border-color: var(--champion-gold);
      color: var(--champion-gold);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.75)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: var(--white);
      position: relative;
    }
    .hero-content {
      max-width: 880px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(3rem, 8vw, 4.8rem);
      font-weight: 800;
      color: var(--champion-gold);
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.4rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 36px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-charcoal);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.15rem;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    /* 解决方案 - 不对称网格 */
    .solutions-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
    }
    .solution-visual {
      flex: 1 1 45%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-text {
      flex: 1 1 45%;
    }
    .solution-text h3 {
      font-size: 2rem;
      color: var(--deep-charcoal);
      margin-bottom: 18px;
    }
    .pain-point {
      color: var(--competition-red);
      font-weight: 600;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .benefit {
      color: var(--champion-gold);
      font-weight: 600;
    }

    /* 成果数字 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 36px;
      text-align: center;
    }
    .stat-item {
      background: var(--white);
      padding: 32px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-size: 3.6rem;
      font-weight: 800;
      color: var(--champion-gold);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .testimonial-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 5rem;
      color: var(--champion-gold);
      position: absolute;
      top: -10px;
      left: 20px;
      opacity: 0.35;
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    }
    .faq-question {
      background: var(--deep-charcoal);
      color: white;
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-radius: var(--radius-sm);
    }
    .faq-answer {
      padding: 20px 24px;
      background: var(--light-gray);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 区块 */
    .cta-band {
      background: var(--deep-charcoal);
      color: white;
      text-align: center;
      padding: 80px 24px;
      background-image: radial-gradient(circle at 30% 30%, #2a2a2a 0%, #1A1A1A 90%);
    }

    footer {
      background: #0F0F0F;
      color: #ccc;
      padding: 40px 0;
      text-align: center;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
      .solutions-grid {
        flex-direction: column;
      }
    }