/* roulang page: index */
:root {
      --primary: #E3481C;
      --primary-dark: #B8350E;
      --secondary: #1A1C20;
      --surface: #F5F0EB;
      --white: #FFFFFF;
      --accent: #00C49A;
      --accent-dark: #009f7a;
      --text-main: #1A1C20;
      --text-muted: #5A5D63;
      --border-light: rgba(0,0,0,0.04);
      --border-card: rgba(255,255,255,0.08);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.12);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-tag: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'Oswald', 'DIN Alternate', 'Bebas Neue', sans-serif;
      --transition: all 0.25s ease;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    button, input, select, textarea { font-family: inherit; }

    /* 导航 Dock */
    .nav-dock {
      position: sticky;
      top: 24px;
      z-index: 100;
      display: flex;
      justify-content: center;
      pointer-events: none;
    }
    .nav-container {
      pointer-events: auto;
      background: rgba(26,28,32,0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 8px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: fit-content;
      max-width: 95%;
      box-shadow: 0 12px 30px rgba(0,0,0,0.2);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--white);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      margin: 0 24px;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition);
      padding: 6px 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: white;
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition);
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(227,72,28,0.4);
    }
    .nav-cta:hover {
      background: #C93A10;
      transform: scale(1.03);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.6rem;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(120deg, #E3481C 0%, #B8350E 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 80px;
      margin-top: -80px;
      color: white;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      opacity: 0.2;
      mix-blend-mode: overlay;
    }
    .speed-lines {
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(45deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 3rem;
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 550px;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 28px;
    }
    .badge-item {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 16px 24px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .badge-number {
      font-family: var(--font-data);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .badge-label {
      font-size: 0.85rem;
      opacity: 0.85;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .btn-primary {
      background: var(--white);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    }
    .btn-primary:hover {
      background: #f0f0f0;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 指标看板 */
    #metrics {
      background: var(--secondary);
      color: white;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      backdrop-filter: blur(6px);
      transition: var(--transition);
    }
    .metric-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .metric-number {
      font-family: var(--font-data);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    .metric-label {
      opacity: 0.8;
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 32px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-body {
      padding: 28px 24px;
    }
    .service-body h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 16px 0;
    }
    .tag {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      margin-top: 12px;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }

    /* 对比 */
    .compare-row {
      display: flex;
      gap: 32px;
      align-items: center;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      min-width: 280px;
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.highlight {
      background: white;
      border: 2px solid var(--primary);
    }
    .vs-badge {
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--primary);
      margin: 16px 0;
    }

    /* FAQ */
    .faq-list {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 8px 0;
    }
    .faq-item {
      border-bottom: 1px solid #e0dcd7;
      padding: 16px 24px;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 12px;
    }

    /* CTA 表单 */
    .cta-section {
      background: linear-gradient(120deg, #E3481C, #B8350E);
      color: white;
    }
    .form-card {
      background: white;
      border-radius: 28px;
      padding: 40px;
      max-width: 600px;
      margin: 0 auto;
      color: var(--text-main);
    }
    .form-input {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: 1px solid #ddd;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 16px;
      width: 100%;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-accent:hover {
      background: var(--accent-dark);
    }

    footer {
      background: var(--secondary);
      color: #ccc;
      padding: 40px 0;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .nav-container { width: 95%; }
      .hero h1 { font-size: 2.2rem; }
      .metrics-grid { grid-template-columns: 1fr; }
      .compare-row { flex-direction: column; }
    }