/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary: #C75B3A;
      --primary-hover: #A84A2E;
      --secondary: #E8A87C;
      --dark: #2C2C2C;
      --darker: #1E1E1E;
      --body-bg: #FAF8F5;
      --white: #FFFFFF;
      --gray-light: #B0B0B0;
      --border-light: rgba(255,255,255,0.15);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
      --shadow-lg: 0 15px 40px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 10px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      transition: color var(--transition);
    }

    h1, h2, h3, h4, p {
      margin: 0;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 玻璃导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(30,30,30,0.45);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-nav.scrolled {
      background: rgba(30,30,30,0.96);
      box-shadow: 0 4px 25px rgba(0,0,0,0.2);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 24px;
      max-width: 1300px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: #FFFFFF;
      font-family: "Inter", sans-serif;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 30px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: #FFFFFF;
    }

    .btn-outline-nav {
      border: 1.5px solid #FFFFFF;
      color: #FFFFFF;
      background: transparent;
      padding: 8px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.2s;
      white-space: nowrap;
    }

    .btn-outline-nav:hover {
      background: #FFFFFF;
      color: var(--dark);
    }

    /* 移动端汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 840px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(30,30,30,0.98);
        padding: 20px;
        gap: 18px;
        backdrop-filter: blur(20px);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* Hero 双栏 */
    .hero-section {
      background: var(--body-bg);
      padding: 150px 0 80px;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--dark);
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }

    .hero-left h1 span {
      color: var(--primary);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #4a4a4a;
      margin-bottom: 1.8rem;
      font-weight: 400;
    }

    .hero-desc {
      font-size: 1.05rem;
      color: #555;
      margin-bottom: 2.2rem;
      line-height: 1.8;
      max-width: 90%;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 13px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      color: white;
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 13px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition);
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(199,91,58,0.08);
    }

    .hero-right img {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-lg);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
      position: relative;
    }

    .hero-img-wrapper {
      position: relative;
    }

    .hero-img-wrapper::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(199,91,58,0.18) 0%, transparent 70%);
      border-radius: var(--radius-img);
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 35px;
      }
      .hero-left h1 {
        font-size: 2.5rem;
      }
    }

    /* 亮点网格 */
    .highlights-section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 50px;
      color: var(--dark);
    }

    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.25s;
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }

    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .highlight-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .highlight-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .highlight-card p {
      color: #5a5a5a;
      font-size: 0.98rem;
    }

    /* 案例瀑布流 */
    .cases-section {
      padding: 80px 0;
    }

    .waterfall {
      column-count: 2;
      column-gap: 25px;
    }

    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 25px;
      transition: transform 0.2s;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-card img {
      width: 100%;
      object-fit: cover;
      height: 220px;
      transition: transform 0.3s;
    }

    .case-card:hover img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-tag {
      background: rgba(232,168,124,0.2);
      color: var(--primary);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .case-info h4 {
      font-weight: 600;
      margin: 8px 0 5px;
    }

    @media (max-width: 768px) {
      .waterfall {
        column-count: 1;
      }
    }

    /* 方案对比 */
    .compare-section {
      padding: 80px 0;
      background: #fff;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 25px;
    }

    .plan-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid #eee;
      text-align: center;
      transition: all 0.2s;
      position: relative;
    }

    .plan-card.recommended {
      border: 2px solid var(--primary);
      box-shadow: 0 10px 25px rgba(199,91,58,0.1);
    }

    .badge-recommend {
      background: var(--primary);
      color: white;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .plan-name {
      font-size: 1.6rem;
      font-weight: 700;
      margin: 15px 0 8px;
    }

    .plan-price {
      font-size: 2rem;
      font-weight: 700;
      color: var(--dark);
      margin: 15px 0;
    }

    .feature-list {
      list-style: none;
      padding: 0;
      margin: 25px 0;
    }

    .feature-list li {
      padding: 10px 0;
      border-bottom: 1px solid #f0f0f0;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-section {
      padding: 80px 0;
    }

    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      background: #fff;
      border-radius: 8px;
      padding: 18px 22px;
      border: 1px solid #eee;
      transition: 0.2s;
    }

    .accordion-title:hover {
      background: #faf8f5;
    }

    .accordion-item.is-active .accordion-title {
      background: #fdf7f4;
      border-left: 4px solid var(--primary);
    }

    /* CTA */
    .cta-dark {
      background: var(--darker);
      padding: 90px 0;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .cta-dark h2 {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 15px;
    }

    .cta-mail {
      color: #ccc;
      margin-top: 18px;
    }

    /* 页脚 */
    .footer {
      background: #1a1a1a;
      color: #ccc;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
    }

    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }