/* roulang page: index */
:root {
      --primary: #0A4D3C;
      --primary-deep: #06382B;
      --accent: #F47B20;
      --accent-hover: #E06B10;
      --bg-warm: #FAFAF7;
      --bg-light: #F0F2EC;
      --card-bg: #FFFFFF;
      --text-main: #1E2A24;
      --text-secondary: #5A6B62;
      --text-on-dark: #FFFFFF;
      --text-accent-light: #C8E6D8;
      --border: #DDE5DF;
      --success: #2E7D5B;
      --radius-card: 20px;
      --radius-btn: 14px;
      --shadow-card: 0 10px 28px rgba(10, 77, 60, 0.08);
      --shadow-hover: 0 18px 38px rgba(10, 77, 60, 0.14);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 28px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      transition: background 0.3s ease, backdrop-filter 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .site-header.scrolled {
      background: rgba(6, 56, 43, 0.92);
      backdrop-filter: blur(14px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 0.02em;
    }

    .logo-icon {
      font-size: 1.8rem;
      filter: drop-shadow(0 2px 6px rgba(244, 123, 32, 0.5));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      font-weight: 600;
      font-size: 0.95rem;
      color: rgba(255, 255, 255, 0.9);
    }

    .nav-links a {
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }

    .btn-nav-cta {
      background: var(--accent);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      transition: background 0.2s, box-shadow 0.2s;
      cursor: pointer;
       margin-left: 12px;
    }

    .btn-nav-cta:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 18px rgba(244, 123, 32, 0.4);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 6px;
    }

    .hamburger span {
      display: block;
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 4px;
      transition: 0.25s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(6, 56, 43, 0.97);
      backdrop-filter: blur(16px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      font-weight: 700;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A4D3C 0%, #06382B 100%);
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text h1 {
      font-size: clamp(2.8rem, 5.5vw, 4.2rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .highlight {
      color: var(--accent);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-accent-light);
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 15px 36px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 12px 28px rgba(244, 123, 32, 0.45);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 13px 34px;
      border-radius: 40px;
      font-weight: 700;
      cursor: pointer;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    .hero-mockup {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(18px);
      border-radius: 28px;
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.2);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .mock-input {
      background: rgba(255,255,255,0.2);
      height: 44px;
      border-radius: 14px;
    }

    .mock-btn {
      background: var(--accent);
      height: 44px;
      border-radius: 30px;
      width: 60%;
    }

    /* 指标看板 */
    .metrics {
      padding: 80px 0;
      background: var(--bg-light);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
      background: white;
      border-radius: 32px;
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
    }

    .metric-item {
      text-align: center;
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
    }

    .metric-label {
      color: var(--text-secondary);
      font-weight: 500;
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 32px;
      margin-top: 48px;
    }

    .service-card {
      background: white;
      border-radius: 24px;
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: 0.25s ease;
      border: 1px solid var(--border);
    }

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

    .card-icon {
      font-size: 2.4rem;
      margin-bottom: 20px;
    }

    /* 对比表 */
    .compare {
      padding: 80px 0;
      background: var(--bg-light);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }

    .compare-card {
      background: white;
      border-radius: 28px;
      padding: 32px;
    }

    .compare-card.bad {
      opacity: 0.8;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid var(--border);
    }

    /* FAQ */
    .faq {
      padding: 90px 0;
      background: white;
    }

    .accordion {
      margin-top: 40px;
    }

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

    .accordion-btn {
      width: 100%;
      background: transparent;
      border: none;
      text-align: left;
      padding: 20px 0;
      font-weight: 700;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A4D3C, #06382B);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .cta-form {
      display: flex;
      max-width: 520px;
      margin: 28px auto 0;
      gap: 12px;
    }

    .cta-input {
      flex: 1;
      padding: 16px;
      border-radius: 40px;
      border: none;
    }

    /* 页脚 */
    .footer {
      background: #0a2e25;
      color: #C8E6D8;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }

    @media (max-width: 768px) {
      .hero-content { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }