/* roulang page: index */
:root {
      --primary: #00C853;
      --primary-dark: #00B248;
      --secondary: #1B1B2F;
      --accent: #FF6D00;
      --accent-hover: #E55A00;
      --bg-body: #F5F7FA;
      --card-bg: #FFFFFF;
      --text-main: #1B1B2F;
      --text-secondary: #5A5A6E;
      --text-muted: #7A7A8C;
      --border-light: rgba(0,0,0,0.05);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --shadow-glow: 0 0 0 0 rgba(255,109,0,0.5);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --transition-ui: 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.4;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s;
      padding: 0.8rem 0;
    }
    .header.scrolled {
      background: rgba(27, 27, 47, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    .header.scrolled .logo {
      color: white;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: rgba(255,255,255,0.9);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-cta-header {
      background: var(--accent);
      color: white !important;
      padding: 0.6rem 1.5rem;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s;
    }
    .btn-cta-header:hover {
      background: var(--accent-hover);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: white;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.2rem;
      z-index: 999;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.25s;
    }
    .mobile-menu.active {
      display: flex;
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.4rem;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      padding: 9rem 0 5rem;
      background: linear-gradient(135deg, #1B1B2F 0%, #1f2438 100%);
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2.5rem;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-left h1 {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.8rem;
      color: white;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 2.2rem;
      line-height: 1.6;
      max-width: 550px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(0,200,83,0.3);
    }
    .btn-outline {
      border: 1.5px solid white;
      color: white;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-btn);
      background: transparent;
      font-weight: 500;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--secondary);
    }
    .hero-right {
      flex: 1 1 45%;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 2rem;
      border: 1px solid rgba(255,255,255,0.1);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }
    .live-panel {
      font-family: var(--font-mono);
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .stat-item {
      background: rgba(0,0,0,0.4);
      padding: 1rem;
      border-radius: 10px;
    }
    .stat-number {
      font-size: 2rem;
      color: var(--accent);
      font-weight: 700;
    }

    /* sections */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      color: var(--secondary);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
      margin-top: 3rem;
    }
    .feature-card {
      background: var(--card-bg);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-ui);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .cases-masonry {
      columns: 3;
      column-gap: 1.5rem;
      margin-top: 2.5rem;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-ui);
      break-inside: avoid;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }

    .compare-table {
      overflow-x: auto;
      margin-top: 2rem;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      margin-top: 2rem;
    }
    .faq-item {
      background: white;
      border-radius: 8px;
    }

    .cta-band {
      background: linear-gradient(135deg, #1B1B2F 0%, #2b2e45 100%);
      position: relative;
      padding: 5rem 0;
      text-align: center;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      padding: 3rem 0;
    }

    .pulse-btn {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,109,0,0.5); }
      70% { box-shadow: 0 0 0 12px rgba(255,109,0,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,109,0,0); }
    }

    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; }
      .cases-masonry { columns: 2; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-left h1 { font-size: 2.4rem; }
      .cases-masonry { columns: 1; }
      .faq-grid { grid-template-columns: 1fr; }
    }