/* roulang page: index */
:root {
      --primary: #0A1F1A;
      --primary-light: rgba(10, 31, 26, 0.92);
      --accent: #C8A951;
      --accent-deep: #b3983e;
      --emphasis: #E94E3C;
      --emphasis-dark: #C0392B;
      --bg: #F5F3EE;
      --surface: #FFFFFF;
      --border: #E8E5DF;
      --text: #1C1C1C;
      --text-muted: #5A5A5A;
      --dark-bg: #0F1410;
      --success: #2D8B4E;
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 24px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: 'Inter', 'Segoe UI', sans-serif;
      --transition: 0.3s ease;
      --transition-fast: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-fast);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 31, 26, 0.9);
      backdrop-filter: blur(10px);
      display: flex;
      align-items: center;
      z-index: 1000;
      transition: background var(--transition);
      border-bottom: 1px solid rgba(200, 169, 81, 0.15);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--accent);
    }

    .nav-menu {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-menu a {
      color: #e0e0e0;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition-fast);
    }

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

    .nav-cta {
      background: var(--emphasis);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 30px;
      font-weight: 600;
      border: none !important;
      transition: background var(--transition-fast);
    }
    .nav-cta:hover {
      background: var(--emphasis-dark);
      color: white !important;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--primary-light);
        flex-direction: column;
        gap: 0;
        padding: 20px 0;
        display: none;
        backdrop-filter: blur(12px);
      }
      .nav-menu.active-mobile {
        display: flex;
      }
      .nav-menu a {
        padding: 16px 24px;
        border-bottom: none;
        width: 100%;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, #143226, #0A1F1A);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-texture {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
      width: 100%;
      padding: 100px 0 60px;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-left h1 .accent {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 1.15rem;
      color: #d4d4d4;
      margin-bottom: 32px;
    }
    .hero-btns {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--emphasis);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: background var(--transition-fast);
    }
    .btn-primary:hover {
      background: var(--emphasis-dark);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      transition: var(--transition-fast);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    .hero-right {
      display: flex;
      flex-direction: column;
      gap: 18px;
      position: relative;
    }
    .stat-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid rgba(200,169,81,0.25);
      color: white;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      font-size: 0.9rem;
      color: #ccc;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
      .hero-btns {
        justify-content: center;
      }
    }

    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      font-size: 2.3rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 50px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(200,169,81,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
      color: var(--accent);
    }
    .feature-card h3 {
      margin-bottom: 10px;
      font-size: 1.3rem;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 520px) {
      .features-grid { grid-template-columns: 1fr; }
    }

    /* 场景 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      margin-bottom: 70px;
    }
    .scenario-img {
      background: #ddd8cd;
      border-radius: 16px;
      overflow: hidden;
    }
    .scenario-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .scenario-text .tag {
      color: var(--emphasis);
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .scenario-row { grid-template-columns: 1fr; }
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: #f8f6f1;
      border-radius: var(--radius);
      padding: 30px;
      border-left: 4px solid var(--accent);
    }
    .case-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .cases-grid { grid-template-columns: 1fr; }
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius);
      padding: 36px 28px;
      border: 1px solid var(--border);
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      position: relative;
    }
    .badge {
      background: var(--emphasis);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    @media (max-width: 768px) {
      .pricing-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-item {
      background: white;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-dark {
      background: var(--dark-bg);
      text-align: center;
      padding: 80px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      color: #aaa;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    button, .btn-primary, .btn-outline {
      cursor: pointer;
    }