/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --bamboo-green: #2E8B57;
      --warm-white: #F9F6F0;
      --score-red: #D94F4F;
      --light-green-bg: #E6F0EA;
      --gold: #C9A84C;
      --text-dark: #1e1e1e;
      --text-gray: #5a5a5a;
      --border-light: #E0E0E0;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: all 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Noto Serif SC', '思源宋体', 'Georgia', serif;
      background-color: var(--warm-white);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      display: flex;
      min-height: 100vh;
    }

    h1, h2, h3, h4, .score-number, .nav-logo {
      font-family: 'Noto Sans SC', '思源黑体', 'Helvetica Neue', sans-serif;
      font-weight: 700;
    }

    .din-number {
      font-family: 'DIN Alternate', 'Roboto Mono', 'Courier New', monospace;
      font-weight: 700;
    }

    /* 左侧竖向导航 */
    .side-nav {
      width: 240px;
      background-color: var(--primary-black);
      color: white;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      padding: 2rem 0 1.5rem;
      z-index: 100;
      box-shadow: 2px 0 15px rgba(0,0,0,0.06);
    }

    .logo-area {
      padding: 0 1.8rem 2rem;
      border-bottom: 1px solid rgba(255,255,255,0.12);
      margin-bottom: 2rem;
    }

    .nav-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-logo i {
      color: var(--bamboo-green);
      font-size: 2rem;
    }

    .nav-links {
      list-style: none;
      margin: 0;
      padding: 0 0.8rem;
      flex: 1;
    }

    .nav-links li a {
      display: block;
      color: #cccccc;
      text-decoration: none;
      padding: 0.9rem 1.2rem;
      border-radius: 0 8px 8px 0;
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      border-left: 3px solid transparent;
      margin-bottom: 0.2rem;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: white;
      background-color: rgba(255,255,255,0.05);
      border-left: 3px solid var(--bamboo-green);
    }

    .nav-links li a.active {
      color: var(--bamboo-green);
      font-weight: 600;
    }

    .side-footer {
      padding: 1rem 1.8rem;
      font-size: 0.8rem;
      color: #888;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    /* 右侧主内容 */
    .main-content {
      margin-left: 240px;
      width: calc(100% - 240px);
      background: var(--warm-white);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2.5rem;
    }

    section {
      padding: 5rem 0;
    }

    /* 移动端导航 */
    .mobile-header {
      display: none;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--bamboo-green);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.8rem 2rem;
      font-weight: 600;
      font-family: 'Noto Sans SC', sans-serif;
      border: none;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: #1F6B41;
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--bamboo-green);
      color: var(--bamboo-green);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.9rem;
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(46,139,87,0.08);
      color: #1F6B41;
    }
    .btn-white-outline {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-white-outline:hover {
      background: white;
      color: var(--bamboo-green);
    }

    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: radial-gradient(circle at center, rgba(46,139,87,0.08) 0%, transparent 70%);
      border-radius: 32px;
      padding: 1.5rem;
    }
    .hero-right img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }

    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--primary-black);
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-gray);
      margin-bottom: 2rem;
    }

    .badge {
      background: var(--light-green-bg);
      color: var(--bamboo-green);
      padding: 0.3rem 1rem;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
    }

    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      padding: 2rem;
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      color: var(--bamboo-green);
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
    }
    .gold-text {
      color: var(--gold);
    }

    .section-title {
      font-size: 2.4rem;
      margin-bottom: 1rem;
      color: var(--primary-black);
    }
    .section-sub {
      color: var(--text-gray);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      margin-bottom: 3rem;
    }
    .scenario-img {
      flex: 1;
    }
    .scenario-text {
      flex: 1;
    }

    .big-number {
      font-size: 3rem;
      color: var(--score-red);
    }

    .pricing-card {
      background: white;
      border-radius: 16px;
      padding: 2rem;
      text-align: center;
      border: 1px solid var(--border-light);
    }
    .pricing-card.popular {
      border: 2px solid var(--bamboo-green);
      position: relative;
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--bamboo-green);
      color: white;
      padding: 0.3rem 1.2rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    footer {
      background: var(--primary-black);
      color: #ccc;
      padding: 3rem 0;
    }
    footer a {
      color: #bbb;
    }
    footer a:hover {
      color: var(--bamboo-green);
    }

    @media (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-header {
        display: flex;
        background: var(--primary-black);
        color: white;
        padding: 0.8rem 1.5rem;
        justify-content: space-between;
        align-items: center;
      }
      .container {
        padding: 0 1.5rem;
      }
      .hero-grid {
        flex-direction: column;
      }
    }