/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --dark-bg: #1A1F3A;
      --cyan: #00F0FF;
      --orange: #FF6B35;
      --white: #FFFFFF;
      --text-primary: rgba(255,255,255,0.9);
      --text-secondary: rgba(255,255,255,0.7);
      --text-muted: rgba(255,255,255,0.45);
      --card-bg: rgba(255,255,255,0.05);
      --card-border: rgba(255,255,255,0.08);
      --card-hover-border: rgba(0,240,255,0.3);
      --shadow-heavy: 0 10px 32px rgba(0,0,0,0.45);
      --shadow-cyan: 0 0 18px rgba(0,240,255,0.5);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-pill: 30px;
      --transition: all 0.28s cubic-bezier(0.2,0.9,0.4,1);
      --max-width: 1280px;
      --section-gap: 100px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', '思源黑体', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.88);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      height: 70px;
      transition: var(--transition);
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--cyan);
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 10px 22px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      font-size: 0.9rem;
    }
    .nav-cta:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.4);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--white);
      cursor: pointer;
      background: none;
      border: none;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(24px);
      flex-direction: column;
      gap: 2rem;
      padding: 2.5rem;
      text-align: center;
      font-size: 1.3rem;
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--white);
      text-decoration: none;
      font-weight: 600;
    }
    section {
      padding: var(--section-gap) 0;
    }
    /* 首屏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3rem;
      align-items: center;
      margin-top: 70px;
      min-height: 90vh;
    }
    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 1.4rem;
      color: var(--white);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1.2rem;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A0E27;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(0,240,255,0.7);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }
    .score-panel {
      background: var(--card-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-heavy);
    }
    .live-badge {
      color: var(--orange);
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 0.3rem;
      margin-bottom: 1rem;
    }
    .match-row {
      display: flex;
      justify-content: space-between;
      font-size: 2.2rem;
      font-weight: 700;
      font-family: 'DIN Alternate', 'Courier New', monospace;
      margin: 1rem 0;
    }
    /* 亮点 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      transition: var(--transition);
    }
    .card:hover {
      background: rgba(255,255,255,0.08);
      border-color: var(--card-hover-border);
      transform: translateY(-6px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.5);
    }
    .card i {
      font-size: 2.2rem;
      color: var(--cyan);
      margin-bottom: 1.2rem;
    }
    /* 案例瀑布 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 1rem;
    }
    .tag {
      background: var(--orange);
      color: #0A0E27;
      font-weight: 700;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
    }
    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .plan-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 2.2rem 1.6rem;
      text-align: center;
      position: relative;
    }
    .plan-card.featured {
      border-color: var(--orange);
      box-shadow: 0 0 24px rgba(255,107,53,0.25);
    }
    .popular-badge {
      background: var(--orange);
      color: white;
      font-size: 0.8rem;
      padding: 5px 14px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      right: 20px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }
    input, textarea {
      width: 100%;
      background: transparent;
      border: none;
      border-bottom: 1.5px solid rgba(255,255,255,0.25);
      padding: 12px 8px;
      color: white;
      font-size: 1rem;
      outline: none;
      transition: border 0.2s;
    }
    input:focus, textarea:focus {
      border-bottom-color: var(--cyan);
    }
    .footer {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 40px 0;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      color: var(--text-muted);
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: 1fr 1fr; }
      .compare-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      h1 { font-size: 2.4rem; }
      .grid-3, .compare-grid, .contact-grid { grid-template-columns: 1fr; }
    }
    .overlay-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }