/* roulang page: index */
:root {
      --deep-sea: #0A4C5C;
      --coral: #FF6F4C;
      --amber: #F0A830;
      --bg-mist: #F7F8FA;
      --text-main: #1A1D26;
      --text-muted: #5B6270;
      --white: #FFFFFF;
      --dark-footer: #111827;
      --border-light: #E5E7EB;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 32px rgba(10,76,92,0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.3s ease;
    }

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

    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-mist);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: var(--transition-smooth);
      backdrop-filter: blur(0px);
      padding: 16px 0;
    }

    .navbar.scrolled {
      background: rgba(10, 76, 92, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      padding: 10px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--white);
      text-decoration: none;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
      text-shadow: 0 2px 6px rgba(0,0,0,0.3);
    }

    .logo i {
      color: var(--coral);
      font-size: 2rem;
    }

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

    .nav-links a {
      color: var(--white);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition-smooth);
      position: relative;
      padding: 4px 0;
    }

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

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A4C5C 0%, #063440 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: var(--white);
      padding: 120px 0 80px;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    .hero .subtitle {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 36px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--coral);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      font-size: 1rem;
      box-shadow: 0 6px 16px rgba(255,111,76,0.3);
    }

    .btn-primary:hover {
      background: #E85D3A;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(255,111,76,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--coral);
      color: var(--coral);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      background: rgba(255,111,76,0.15);
      color: white;
      border-color: white;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(4px);
    }

    /* 实时指标 */
    .metrics {
      padding: 80px 0;
    }

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

    .metric-card {
      background: var(--white);
      padding: 28px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      text-align: center;
    }

    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .metric-icon {
      font-size: 2rem;
      color: var(--coral);
      margin-bottom: 12px;
    }

    .metric-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-sea);
      font-family: 'DIN Alternate', 'Noto Sans SC', sans-serif;
    }

    .metric-label {
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 服务矩阵 */
    .services {
      padding: 80px 0;
      background: var(--white);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
      color: var(--deep-sea);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--bg-mist);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition-smooth);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

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

    .service-content {
      padding: 24px;
    }

    .service-content h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
    }

    /* 对比 */
    .compare {
      padding: 80px 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-col {
      padding: 32px;
      border-radius: var(--radius-md);
    }

    .compare-old {
      background: #F3F4F6;
      border-left: 6px solid #EF4444;
    }

    .compare-new {
      background: #E6F7F5;
      border-left: 6px solid var(--deep-sea);
      box-shadow: 0 0 20px rgba(10,76,92,0.1);
    }

    .compare-list {
      list-style: none;
      margin-top: 20px;
    }

    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--white);
    }

    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }

    .accordion-question {
      background: #F9FAFB;
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid var(--coral);
      transition: 0.2s;
    }

    .accordion-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-muted);
    }

    .accordion-item.active .accordion-answer {
      display: block;
    }

    .accordion-item.active .accordion-question {
      border-left-color: var(--deep-sea);
    }

    /* CTA */
    .cta {
      background: linear-gradient(135deg, #0A4C5C, #063440);
      padding: 80px 0;
      color: white;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .cta-form input, .cta-form textarea {
      flex: 1 1 200px;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: 1px solid rgba(255,255,255,0.3);
      background: rgba(255,255,255,0.1);
      color: white;
      font-size: 1rem;
    }

    .cta-form input:focus {
      outline: none;
      border-color: var(--coral);
      box-shadow: 0 0 0 3px rgba(255,111,76,0.3);
    }

    .footer {
      background: var(--dark-footer);
      color: #ccc;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }

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

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 2.2rem; }
      .compare-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
    }