/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --accent: #FFB300;
      --accent-dark: #FFA000;
      --dark-bg: #1E1E2F;
      --darker-bg: #161625;
      --card-dark: #2C2C3A;
      --gray-light: #F5F5F5;
      --gray-bg: #FAFAFA;
      --text-main: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-light: #888888;
      --white: #FFFFFF;
      --success: #00C853;
      --border-light: rgba(255,255,255,0.08);
      --border-gold: rgba(255,179,0,0.3);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 30px;
      --max-width: 1280px;
      --section-gap: 100px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: rgba(30,30,47,0.95);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent);
      text-decoration: none;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      color: #CCCCCC;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a.active {
      color: var(--white);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 26px;
      cursor: pointer;
    }
    
    /* 区块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      font-size: 16px;
      margin-bottom: 48px;
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1E1E2F 0%, #161625 100%);
      padding: 120px 0 80px;
      margin-top: 68px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -50%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(229,57,53,0.18) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: 42px;
      font-weight: 800;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 16px;
      line-height: 1.6;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 28px;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 2px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border: none;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }
    .btn-gold {
      background-color: var(--accent);
      color: var(--dark-bg);
    }
    .btn-gold:hover {
      background-color: var(--accent-dark);
    }
    .btn-outline-gold {
      border: 2px solid var(--accent);
      color: var(--accent);
      background: transparent;
    }
    .btn-outline-gold:hover {
      background-color: var(--accent);
      color: var(--dark-bg);
    }
    .hero-image {
      width: 100%;
      border-radius: 16px;
      border: 4px solid var(--border-gold);
      transform: rotate(-1deg);
      box-shadow: 0 20px 35px rgba(0,0,0,0.5);
      object-fit: cover;
    }
    
    /* 亮点网格 */
    .highlights {
      padding: var(--section-gap) 0;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.25s;
      text-align: center;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 20px;
      transition: color 0.2s;
    }
    .highlight-card:hover .highlight-icon {
      color: var(--accent);
    }
    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
      background-color: var(--gray-light);
    }
    .masonry {
      columns: 2;
      column-gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      break-inside: avoid;
      margin-bottom: 24px;
      transition: transform 0.25s;
    }
    .case-card:hover {
      transform: translateY(-3px);
    }
    .case-img {
      width: 100%;
      display: block;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
    }
    .case-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin: 10px 0;
    }
    .tag {
      background: var(--accent);
      color: var(--dark-bg);
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
    }
    
    /* 方案对比 */
    .compare {
      padding: var(--section-gap) 0;
    }
    .table-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .compare-table {
      width: 100%;
      min-width: 600px;
      border-collapse: collapse;
      background: white;
    }
    .compare-table th {
      background: var(--card-dark);
      color: white;
      padding: 16px;
      font-weight: 600;
    }
    .compare-table td {
      padding: 16px;
      text-align: center;
      border-bottom: 1px solid #eee;
    }
    .compare-table td:first-child {
      text-align: left;
      font-weight: 600;
    }
    .compare-table tr:nth-child(odd) td {
      background: #F9F9F9;
    }
    .compare-table tr:hover td {
      background: #FFF3E0;
    }
    .check {
      color: var(--success);
      font-weight: bold;
    }
    
    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      width: 100%;
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      border: none;
      font-size: 18px;
      font-weight: 600;
      cursor: pointer;
      text-align: left;
    }
    .faq-icon {
      transition: transform 0.3s;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    
    /* CTA */
    .cta {
      background: var(--dark-bg);
      padding: 80px 0;
      color: white;
      text-align: center;
    }
    .cta h2 {
      color: white;
    }
    .cta-form {
      max-width: 560px;
      margin: 40px auto 0;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .cta-input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-btn);
      padding: 14px 16px;
      color: white;
      font-size: 16px;
      outline: none;
    }
    .cta-input::placeholder {
      color: #AAA;
    }
    .cta-input:focus {
      border-color: var(--accent);
    }
    
    /* 页脚 */
    .footer {
      background: var(--darker-bg);
      color: #AAAAAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent);
    }
    .footer a {
      color: #AAAAAA;
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: white;
    }
    .social-icons i {
      font-size: 22px;
      margin-right: 12px;
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.05);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background: rgba(30,30,47,0.98);
        flex-direction: column;
        padding: 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .cards-grid {
        grid-template-columns: 1fr;
      }
      .masonry {
        columns: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .section-title {
        font-size: 26px;
      }
    }
    @media (max-width: 480px) {
      .btn {
        width: 100%;
        text-align: center;
      }
      .hero h1 {
        font-size: 28px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }