/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent-red: #E63946;
      --gold: #F4A261;
      --energy-orange: #FF6B35;
      --surface-white: #FFFFFF;
      --surface-light: #F8F9FA;
      --surface-dark: #2D2D2D;
      --text-white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #6C757D;
      --border-light: rgba(255,255,255,0.08);
      --radius-lg: 24px;
      --radius-xl: 32px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 16px 32px rgba(230, 57, 70, 0.15);
      --font-heading: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.8;
      background-color: var(--primary);
      color: var(--text-dark);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(26, 26, 26, 0.75);
      backdrop-filter: blur(20px) saturate(180%);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
    }

    .navbar.scrolled {
      background: rgba(26, 26, 26, 0.95);
      backdrop-filter: none;
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-white);
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-red);
      border-radius: 8px;
      position: relative;
    }

    .logo-icon::before,
    .logo-icon::after {
      content: '';
      position: absolute;
      background: var(--text-white);
      border-radius: 2px;
    }

    .logo-icon::before {
      width: 10px;
      height: 2px;
      top: 10px;
      left: 6px;
      transform: rotate(-30deg);
    }

    .logo-icon::after {
      width: 10px;
      height: 2px;
      top: 14px;
      left: 10px;
      transform: rotate(30deg);
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 600;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width var(--transition-smooth);
    }

    .nav-links a:hover {
      color: var(--accent-red);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: linear-gradient(90deg, var(--accent-red), var(--energy-orange));
      color: white;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: opacity var(--transition-smooth), transform var(--transition-smooth);
    }

    .btn-nav:hover {
      opacity: 0.9;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(0,0,0,0.95);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding-left: 48px;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

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

    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1A1A 0%, #2D2D2D 70%, #0D0D0D 100%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .hero-bg-texture {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
      pointer-events: none;
    }

    .particles {
      position: absolute;
      bottom: 10%;
      left: 5%;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(244,162,97,0.2) 1px, transparent 1px);
      background-size: 20px 20px;
      opacity: 0.4;
    }

    .hero-container {
      display: flex;
      align-items: center;
      gap: 60px;
      width: 100%;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 6;
    }

    .hero-right {
      flex: 4;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: clamp(2.8rem, 6vw, 4rem);
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 2rem;
      max-width: 500px;
    }

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

    .btn-primary {
      background: linear-gradient(90deg, var(--accent-red), var(--energy-orange));
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      transition: filter var(--transition-smooth), box-shadow var(--transition-smooth);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 20px rgba(230,57,70,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-smooth);
    }

    .btn-outline:hover {
      border-color: var(--accent-red);
      color: var(--accent-red);
    }

    .data-badge {
      background: rgba(45,45,45,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(244,162,97,0.25);
      border-radius: 20px;
      padding: 20px 24px;
      color: white;
      display: flex;
      align-items: center;
      gap: 16px;
      animation: float 4s ease-in-out infinite;
    }

    .data-badge:nth-child(2) { animation-delay: 0.5s; }
    .data-badge:nth-child(3) { animation-delay: 1s; }

    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }

    .badge-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--gold);
    }

    /* 区块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.2rem;
      text-align: center;
      margin-bottom: 48px;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }

    .section-title::before {
      content: '';
      width: 6px;
      height: 28px;
      background: var(--accent-red);
      border-radius: 4px;
    }

    .bg-light {
      background: var(--surface-light);
    }

    .bg-dark {
      background: var(--primary);
      color: white;
    }

    .bg-dark .section-title {
      color: white;
    }

    /* 数据看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--surface-dark);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid rgba(244,162,97,0.2);
      transition: all var(--transition-smooth);
      color: white;
    }

    .metric-card:hover {
      border-color: var(--accent-red);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--gold);
    }

    .metric-label {
      color: rgba(255,255,255,0.6);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--surface-white);
      border-radius: 28px;
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      box-shadow: 0 12px 40px rgba(0,0,0,0.1);
      transform: translateY(-6px);
    }

    .service-icon {
      width: 80px;
      height: 80px;
      border-radius: 24px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      margin-bottom: 24px;
    }

    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .service-desc {
      color: var(--text-muted);
      margin-bottom: 20px;
      flex: 1;
    }

    .tag-group {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .tag {
      background: var(--surface-light);
      color: var(--accent-red);
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.8rem;
      font-weight: 600;
      transition: var(--transition-smooth);
    }

    .service-card:hover .tag {
      background: var(--accent-red);
      color: white;
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: white;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 8px 30px rgba(0,0,0,0.08);
    }

    .compare-col {
      padding: 40px 24px;
      text-align: center;
      background: white;
    }

    .compare-col.featured {
      background: var(--primary);
      color: white;
      transform: scale(1.02);
      border-radius: 20px;
      box-shadow: 0 0 0 2px var(--accent-red);
      position: relative;
    }

    .popular-badge {
      background: var(--accent-red);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    .compare-price {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      margin: 16px 0;
    }

    .feature-list {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }

    .feature-list li {
      padding: 10px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 12px;
      border: 1px solid #E9ECEF;
    }

    .faq-question {
      padding: 20px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8F9FA;
      padding: 0 20px;
    }

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

    /* 表单 */
    .contact-wrapper {
      background: var(--primary);
      border-radius: var(--radius-xl);
      padding: 60px;
      display: flex;
      gap: 48px;
      color: white;
    }

    .contact-left h2 {
      font-size: 2rem;
      margin-bottom: 16px;
    }

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

    .contact-form input:focus {
      border-color: var(--accent-red);
      outline: none;
    }

    .btn-submit {
      width: 100%;
      background: linear-gradient(90deg, var(--accent-red), var(--energy-orange));
      color: white;
      padding: 16px;
      border: none;
      border-radius: 12px;
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
    }

    footer {
      background: #0D0D0D;
      color: rgba(255,255,255,0.6);
      padding: 40px 0 20px;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-container { flex-direction: column; }
      .metrics-grid, .services-grid { grid-template-columns: 1fr; }
      .contact-wrapper { flex-direction: column; }
      .compare-col.featured { transform: none; }
    }