/* roulang page: index */
:root {
      --primary-bg: #0A0F1F;
      --secondary-bg: #1A1F33;
      --accent-cyan: #00F0FF;
      --accent-purple: #7B2FFF;
      --text-white: #FFFFFF;
      --text-light: #E0E0FF;
      --text-body: #B0C0D0;
      --text-muted: #8899AA;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-hover-bg: rgba(255, 255, 255, 0.06);
      --glass-hover-border: rgba(0, 240, 255, 0.4);
      --card-radius: 16px;
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 240, 255, 0.1);
      --card-hover-shadow: 0 12px 40px rgba(0, 240, 255, 0.15), 0 0 0 1px rgba(0, 240, 255, 0.5);
      --btn-gradient: linear-gradient(135deg, #00F0FF, #7B2FFF);
      --btn-shadow: 0 4px 15px rgba(0, 240, 255, 0.4);
      --btn-hover-shadow: 0 6px 25px rgba(0, 240, 255, 0.7);
      --section-gap: 120px;
      --container-max: 1280px;
      --font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background: var(--primary-bg);
    }

    body {
      font-family: var(--font-family);
      background: linear-gradient(135deg, #0A0F1F 0%, #1A1F33 100%);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 背景网格动效 */
    .grid-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 15, 31, 0.7);
      backdrop-filter: blur(15px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      z-index: 100;
      padding: 0 20px;
      height: 70px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 28px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      text-decoration: none;
    }

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

    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s, text-shadow 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
      transform: scaleX(0);
      transition: transform 0.2s ease;
      box-shadow: 0 0 10px var(--accent-cyan);
    }

    .nav-links a:hover::after {
      transform: scaleX(1);
    }

    .btn-nav {
      background: var(--btn-gradient);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 50px;
      cursor: pointer;
      box-shadow: var(--btn-shadow);
      transition: all 0.25s;
      font-size: 14px;
    }

    .btn-nav:hover {
      box-shadow: var(--btn-hover-shadow);
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10, 15, 31, 0.95);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 99;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 24px;
      text-decoration: none;
      font-weight: 600;
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
      position: relative;
      z-index: 2;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 48px;
      padding-left: 20px;
      border-left: 4px solid var(--accent-cyan);
      display: inline-block;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
    }

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

    .hero-left h1 {
      font-size: 48px;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
      background: linear-gradient(to right, #FFFFFF, #E0E0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      border-bottom: 2px solid transparent;
      border-image: linear-gradient(to right, #00F0FF, #7B2FFF) 1;
      padding-bottom: 10px;
    }

    .hero-sub {
      font-size: 20px;
      color: var(--text-body);
      margin-bottom: 40px;
    }

    .hero-cta {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-primary {
      background: var(--btn-gradient);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      cursor: pointer;
      box-shadow: var(--btn-shadow);
      transition: all 0.25s;
      font-size: 16px;
    }

    .btn-primary:hover {
      box-shadow: var(--btn-hover-shadow);
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(0, 240, 255, 0.5);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      cursor: pointer;
      transition: all 0.25s;
    }

    .btn-secondary:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--accent-cyan);
    }

    .trust-badges {
      display: flex;
      gap: 32px;
      color: var(--text-muted);
      font-size: 14px;
    }

    .hero-right img {
      width: 100%;
      border-radius: 24px;
      filter: drop-shadow(0 0 20px rgba(0, 240, 255, 0.3));
      border: 1px solid rgba(0, 240, 255, 0.3);
    }

    /* 优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      text-align: center;
    }

    .advantage-card:hover {
      transform: translateY(-8px);
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
      box-shadow: var(--card-hover-shadow);
    }

    .advantage-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
      color: var(--accent-cyan);
      filter: drop-shadow(0 0 8px rgba(0,240,255,0.7));
    }

    .advantage-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-light);
      margin-bottom: 12px;
    }

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      border-radius: 12px 12px 0 0;
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      background: rgba(123, 47, 255, 0.2);
      color: #c4b5fd;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      margin-right: 8px;
    }

    /* 对比表格 */
    .comparison-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .plan-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
    }

    .plan-card.recommended {
      border: 2px solid var(--accent-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.4);
      position: relative;
    }

    .badge {
      background: var(--accent-cyan);
      color: #0A0F1F;
      padding: 4px 16px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 14px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .plan-price {
      font-size: 28px;
      font-weight: 800;
      color: white;
      margin: 20px 0;
    }

    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,240,255,0.02);
      padding: 0 20px;
      color: var(--text-muted);
    }

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

    /* CTA 表单 */
    .contact-form {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 40px;
      max-width: 600px;
      margin: 0 auto;
    }

    .form-group input, .form-group textarea {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 8px;
      padding: 12px;
      color: white;
      margin-top: 8px;
      transition: 0.2s;
    }

    .form-group input:focus, .form-group textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 10px rgba(0,240,255,0.2);
      outline: none;
    }

    footer {
      background: #050811;
      border-top: 1px solid var(--accent-cyan);
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .comparison-table { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .advantages-grid { grid-template-columns: 1fr; }
      h2 { font-size: 28px; }
    }