/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --accent-cyan: #00F0D4;
      --deep-black: #0E0E1A;
      --card-bg: #1A1A2E;
      --text-white: #FFFFFF;
      --text-gray: #B0B0C0;
      --border-glow: rgba(123, 47, 247, 0.25);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-lg: 16px;
      --radius-btn: 50px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 100px;
      --container-max: 1320px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-black);
      font-family: var(--font-stack);
      color: var(--text-gray);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
    }

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

    .container {
      max-width: var(--container-max);
      padding-left: 24px;
      padding-right: 24px;
      margin-left: auto;
      margin-right: auto;
    }

    section {
      padding: var(--spacing-section) 0;
      position: relative;
    }

    h2 {
      color: var(--text-white);
      font-weight: 700;
      font-size: 2.2rem;
      letter-spacing: 0.5px;
      margin-bottom: 2.5rem;
      text-align: center;
    }

    h3 {
      color: var(--text-white);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 0.3px;
    }

    .btn-primary-cyan {
      background: linear-gradient(135deg, #00F0D4 0%, #00C4B0 100%);
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      color: #0E0E1A;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(0, 240, 212, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-primary-cyan:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(0, 240, 212, 0.5);
      color: #0E0E1A;
    }

    .btn-outline-purple {
      background: transparent;
      border: 1px solid var(--primary-purple);
      color: var(--primary-purple);
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      transition: all 0.25s ease;
    }

    .btn-outline-purple:hover {
      background: rgba(123, 47, 247, 0.15);
      border-color: #9d5cff;
      color: #c9a9ff;
      transform: translateY(-1px);
    }

    /* 导航 */
    .navbar {
      background-color: rgba(14, 14, 26, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(123, 47, 247, 0.25);
      padding: 12px 0;
      transition: all 0.3s;
    }
    .navbar-brand {
      font-size: 1.7rem;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0D4, #7B2FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand i {
      background: none;
      -webkit-text-fill-color: #00F0D4;
      font-size: 1.8rem;
    }
    .nav-link {
      color: var(--text-gray) !important;
      font-weight: 500;
      margin: 0 8px;
      position: relative;
      transition: 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .navbar-toggler {
      border-color: rgba(123,47,247,0.4);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,212,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    .navbar .btn-primary-cyan {
      padding: 10px 28px;
      font-size: 0.95rem;
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(120deg, #0E0E1A 0%, #1A1025 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-content h1 {
      font-size: 3.8rem;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-gray);
      max-width: 550px;
      margin-bottom: 2.5rem;
    }
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 28px;
      min-height: 420px;
      height: 100%;
      position: relative;
      box-shadow: 0 0 60px rgba(123,47,247,0.35);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(123,47,247,0.65) 0%, rgba(14,14,26,0.5) 100%);
      border-radius: 28px;
    }
    .floating-glow {
      position: absolute;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(0,240,212,0.25) 0%, transparent 70%);
      top: 20%;
      right: 5%;
      filter: blur(35px);
    }

    /* 亮点网格 */
    .highlight-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, border-color 0.25s;
      height: 100%;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      border-color: #9d5cff;
      box-shadow: 0 16px 40px rgba(123,47,247,0.3);
    }
    .highlight-icon {
      font-size: 3.2rem;
      color: var(--accent-cyan);
      margin-bottom: 1.5rem;
      opacity: 0.9;
    }
    .highlight-card h3 {
      margin-bottom: 0.75rem;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 20px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 20px;
      border-radius: 16px;
      overflow: hidden;
      background: #1A1A2E;
      border: 1px solid rgba(123,47,247,0.2);
      transition: all 0.3s;
      position: relative;
    }
    .masonry-item img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
    }
    .masonry-item:hover img {
      transform: scale(1.04);
    }
    .masonry-item .overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(14,14,26,0.9));
      padding: 1.5rem;
      color: white;
    }
    .masonry-item .tag {
      color: var(--accent-cyan);
      font-size: 0.8rem;
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    /* 方案对比 */
    .compare-card {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 2.5rem 1.8rem;
      border: 1px solid var(--border-glow);
      height: 100%;
    }
    .compare-highlight {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 30px rgba(0,240,212,0.15);
    }
    .price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 数据带 */
    .trust-strip {
      background: #0A0A14;
      border-top: 1px solid rgba(123,47,247,0.2);
      border-bottom: 1px solid rgba(123,47,247,0.2);
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* FAQ */
    .accordion-button {
      background: transparent;
      color: white;
      font-weight: 600;
      border: none;
      box-shadow: none;
      padding: 1.2rem 1rem;
    }
    .accordion-item {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(123,47,247,0.2);
    }
    .accordion-button:not(.collapsed) {
      background: rgba(123,47,247,0.08);
      color: white;
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #7B2FF7 0%, #0E0E1A 90%);
      border-radius: 28px;
    }

    footer a {
      color: var(--text-gray);
      transition: 0.2s;
    }
    footer a:hover {
      color: var(--accent-cyan);
    }
    .social-icon {
      width: 42px;
      height: 42px;
      border: 1px solid rgba(0,240,212,0.5);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 10px;
      color: var(--accent-cyan);
    }

    @media (max-width: 992px) {
      .hero-content h1 {
        font-size: 2.8rem;
      }
      .masonry-grid {
        column-count: 2;
      }
    }
    @media (max-width: 768px) {
      .hero {
        min-height: auto;
        padding: 120px 0 80px;
      }
      .masonry-grid {
        column-count: 1;
      }
      .compare-row {
        flex-direction: column;
      }
      .navbar .btn-primary-cyan {
        margin-top: 12px;
        width: 100%;
      }
    }