/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #0B0C10;
      --accent: #00F0FF;
      --bg-light: #F5F6F8;
      --text-dark: #1E1E1E;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --green: #2ECC71;
      --orange: #F39C12;
      --border-radius: 12px;
      --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
      --card-hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
      --transition: 0.25s ease;
      --container-max: 1280px;
      --font-data: 'Oswald', sans-serif;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.9);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 28px;
      font-weight: 900;
      color: var(--white);
      letter-spacing: 1px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.85);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

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

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }

    /* 底部导航 (移动端) */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.95);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(255,255,255,0.08);
      justify-content: space-around;
      padding: 8px 12px 12px;
      z-index: 1000;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.6);
      font-size: 12px;
      transition: 0.2s;
      padding: 4px 8px;
      border-radius: 30px;
    }

    .mobile-bottom-nav a i {
      font-size: 20px;
      margin-bottom: 2px;
    }

    .mobile-bottom-nav a.active {
      color: var(--accent);
      background: rgba(0,240,255,0.1);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, #E63946 0%, #0B0C10 85%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><path d="M0 400 L1200 400" stroke="rgba(255,255,255,0.05)" stroke-width="2"/><path d="M200 0 L200 800" stroke="rgba(255,255,255,0.03)" stroke-width="1"/><circle cx="400" cy="300" r="120" fill="none" stroke="rgba(255,255,255,0.02)" stroke-width="4"/></svg>');
      background-size: cover;
      opacity: 0.5;
      pointer-events: none;
    }

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

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: 48px;
      font-weight: 900;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
      text-transform: uppercase;
    }

    .hero-text p {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 16px;
      transition: var(--transition);
      box-shadow: 0 8px 20px rgba(230,57,70,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 16px rgba(230,57,70,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 16px;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: white;
      color: var(--secondary);
    }

    .hero-visual {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px 28px;
      border-radius: var(--border-radius);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    .feature-icon {
      font-size: 36px;
      color: var(--accent);
      margin-bottom: 20px;
      transition: 0.2s;
    }

    .feature-card:hover .feature-icon {
      color: var(--primary);
      transform: scale(1.1);
    }

    .feature-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    /* 数据看板 */
    .data-panel {
      background: var(--secondary);
      color: white;
      border-radius: 24px;
      padding: 60px 40px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
      background-image: radial-gradient(circle at 20% 30%, #1a1c22 0%, #0B0C10 90%);
    }

    .stat-item {
      flex: 1;
      min-width: 160px;
    }

    .stat-number {
      font-family: var(--font-data);
      font-size: 58px;
      color: var(--accent);
      font-weight: 700;
    }

    .stat-label {
      color: #aaa;
      font-size: 15px;
      margin-top: 8px;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 300px;
      background: white;
      border-radius: var(--border-radius);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      border-left: 5px solid var(--primary);
      scroll-snap-align: start;
    }

    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-weight: 700;
      font-size: 18px;
    }

    /* FAQ */
    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .faq-question {
      background: #f0f0f0;
      padding: 18px 24px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      border-radius: 12px;
    }

    .faq-dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      transition: 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      background: white;
      border-radius: 0 0 12px 12px;
      padding: 0 24px;
      color: #333;
    }

    .faq-item.open .faq-answer {
      max-height: 120px;
      padding: 16px 24px;
    }

    .faq-item.open .faq-dot {
      background: var(--accent);
      transform: rotate(90deg);
    }

    /* CTA */
    .cta-band {
      background: radial-gradient(circle at 30% 40%, #E63946, #0B0C10);
      text-align: center;
      padding: 80px 24px;
      color: white;
    }

    .cta-band h2 {
      font-size: 36px;
      font-weight: 800;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      padding: 14px 40px;
      border-radius: 30px;
      font-weight: 700;
      margin-top: 24px;
    }

    .btn-white:hover {
      background: #f0f0f0;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 50px 0 30px;
    }

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

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

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
      }
      .hero-visual {
        width: 100%;
        height: 280px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .main-header {
        display: none;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .data-panel {
        flex-direction: column;
        gap: 32px;
      }
    }