/* roulang page: index */
:root {
      --primary-ice: #00E5FF;
      --primary-ice-dark: #00B8D4;
      --accent-orange: #FF6B35;
      --accent-orange-light: #FF8C42;
      --bg-deep: #0A0E27;
      --bg-card: rgba(15, 21, 53, 0.70);
      --bg-elevated: #0F1535;
      --text-white: #FFFFFF;
      --text-gray: rgba(255, 255, 255, 0.8);
      --text-muted: rgba(255, 255, 255, 0.55);
      --border-glass: rgba(0, 229, 255, 0.15);
      --border-active: rgba(0, 229, 255, 0.35);
      --shadow-card: 0 8px 32px rgba(0, 229, 255, 0.08);
      --shadow-button: 0 0 20px rgba(255, 107, 53, 0.6);
      --radius-card: 16px;
      --radius-button: 30px;
      --font-sans: system-ui, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
      background: transparent;
      color: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.80);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-glass);
      display: flex;
      align-items: center;
    }

    .nav-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-ice);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--primary-ice), var(--primary-ice-dark));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: var(--bg-deep);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-gray);
      transition: color 0.2s, text-shadow 0.2s;
      padding: 8px 0;
    }

    .nav-links a:hover {
      color: var(--primary-ice);
      text-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 28px;
    }

    .hamburger span {
      display: block;
      height: 2px;
      background: var(--primary-ice);
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--nav-height));
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(25px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 99;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-white);
      transition: color 0.2s;
    }

    .mobile-menu a:hover {
      color: var(--primary-ice);
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-gray);
      margin-bottom: 48px;
    }

    /* Hero 双栏杂志 */
    #hero {
      padding-top: 60px;
      padding-bottom: 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary-ice), var(--primary-ice-dark));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }

    .hero-left p {
      font-size: 20px;
      color: var(--text-gray);
      margin-bottom: 40px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-light));
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 15px rgba(255,107,53,0.4);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-button);
      transform: translateY(-2px);
      filter: brightness(1.1);
    }

    .btn-outline {
      border: 1px solid var(--primary-ice);
      color: var(--primary-ice);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: 0.25s;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: var(--border-active);
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-card-stack {
      position: relative;
      width: 100%;
      max-width: 400px;
    }

    .hero-card {
      background: rgba(15,21,53,0.7);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s;
    }

    .hero-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .hero-card-content {
      padding: 16px;
      color: var(--text-white);
    }

    .card-1 {
      position: relative;
      z-index: 3;
      transform: rotate(-2deg);
      animation: float 6s ease-in-out infinite;
    }

    .card-2 {
      position: absolute;
      top: 30px;
      right: -20px;
      z-index: 2;
      width: 85%;
      transform: rotate(3deg);
      animation: float 7s ease-in-out infinite reverse;
    }

    .card-3 {
      position: absolute;
      bottom: -30px;
      left: 10px;
      z-index: 1;
      width: 70%;
      transform: rotate(-1deg);
      animation: float 8s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px) rotate(-2deg); }
      50% { transform: translateY(-12px) rotate(-2deg); }
      100% { transform: translateY(0px) rotate(-2deg); }
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }

    .highlight-card {
      background: var(--bg-card);
      backdrop-filter: blur(15px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: all 0.3s;
      box-shadow: var(--shadow-card);
    }

    .highlight-card:hover {
      border-color: var(--border-active);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0,229,255,0.15);
    }

    .highlight-icon {
      font-size: 32px;
      color: var(--primary-ice);
      margin-bottom: 16px;
    }

    .highlight-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary-ice);
      margin-bottom: 12px;
    }

    .highlight-card p {
      color: var(--text-gray);
      font-size: 15px;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
      margin-top: 20px;
    }

    .case-card {
      break-inside: avoid;
      background: var(--bg-card);
      backdrop-filter: blur(15px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      transition: 0.3s;
    }

    .case-card:hover {
      border-color: var(--border-active);
      transform: translateY(-4px);
    }

    .case-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .case-info {
      padding: 20px;
    }

    .case-info h3 {
      font-size: 20px;
      color: var(--primary-ice);
      margin-bottom: 8px;
    }

    .case-tag {
      display: inline-block;
      background: rgba(255,107,53,0.2);
      color: var(--accent-orange);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .case-info p {
      color: var(--text-gray);
      font-size: 14px;
    }

    /* 方案对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: rgba(15,21,53,0.5);
      backdrop-filter: blur(15px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border-glass);
    }

    .compare-col {
      padding: 32px 24px;
      text-align: center;
      border-right: 1px solid var(--border-glass);
    }

    .compare-col:last-child {
      border-right: none;
    }

    .compare-header {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-ice);
      margin-bottom: 24px;
    }

    .compare-item {
      padding: 16px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      color: var(--text-gray);
    }

    .price {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    .compare-cta {
      margin-top: 24px;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      backdrop-filter: blur(15px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-ice);
    }

    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: var(--text-gray);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }

    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-glass);
      border-radius: 12px;
      color: white;
      transition: 0.2s;
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--primary-ice);
      box-shadow: 0 0 10px rgba(0,229,255,0.3);
    }

    .contact-info p {
      margin-bottom: 16px;
      color: var(--text-gray);
    }

    .social-icons i {
      font-size: 24px;
      margin-right: 16px;
      color: var(--primary-ice);
      transition: 0.2s;
    }

    .social-icons i:hover {
      color: var(--accent-orange);
    }

    /* 页脚 */
    .footer {
      background: var(--bg-deep);
      border-top: 1px solid var(--border-glass);
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: var(--text-gray);
      transition: 0.2s;
    }

    .footer a:hover {
      color: var(--accent-orange);
    }

    .copyright {
      margin-top: 32px;
      padding-top: 16px;
      border-top: 1px solid var(--border-glass);
      color: var(--text-muted);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .highlights-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-masonry { columns: 2; }
      .compare-table { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .highlights-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .hero-left h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .footer-grid { grid-template-columns: 1fr; }
    }