/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-deep: #072E23;
      --accent: #D4AF37;
      --accent-hover: #C5A028;
      --bg-warm: #F7F5F0;
      --bg-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-mid: #5A5A5A;
      --text-light: #8A8A8A;
      --alert: #C1666B;
      --border-subtle: rgba(10, 61, 46, 0.08);
      --border-hover: rgba(212, 175, 55, 0.7);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-full: 999px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.03);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.05);
      --font-serif: 'Noto Serif SC', 'Georgia', '宋体', 'Songti SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'SF Pro Text', '微软雅黑', 'PingFang SC', 'Helvetica Neue', sans-serif;
      --max-width: 1280px;
      --gap-section: 120px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    body {
      background-color: var(--bg-warm);
      color: var(--text-dark);
      font-family: var(--font-sans);
      line-height: 1.6;
      font-weight: 400;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* NAVIGATION */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(247, 245, 240, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(10,61,46,0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.02em;
    }

    .nav-logo-icon {
      width: 8px;
      height: 8px;
      background: transparent;
      border-left: 10px solid var(--accent);
      border-top: 5px solid transparent;
      border-bottom: 5px solid transparent;
      margin-left: 6px;
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding-bottom: 4px;
      transition: color 0.3s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 2px;
      background: linear-gradient(to right, var(--primary), var(--accent));
      transform: scaleX(0);
      transition: transform 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a:hover::after {
      transform: scaleX(1);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: rgba(10,61,46,0.04);
      border-radius: var(--radius-full);
      padding: 6px 16px;
    }

    .search-box i {
      color: var(--text-mid);
      font-size: 1rem;
      margin-right: 8px;
    }

    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      color: var(--text-dark);
      width: 120px;
    }

    .btn-text {
      font-weight: 500;
      color: var(--text-dark);
      background: none;
      border: none;
      cursor: pointer;
      transition: color 0.3s;
    }

    .btn-text:hover {
      color: var(--primary);
    }

    .btn-primary {
      background: var(--primary);
      color: var(--accent);
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 2px 6px rgba(10,61,46,0.2);
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: inset 0 2px 6px rgba(0,0,0,0.2);
      color: #E5C55A;
    }

    .btn-primary:focus-visible {
      outline: 2px solid rgba(10,61,46,0.4);
      outline-offset: 2px;
    }

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

    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box, .nav-actions .btn-text, .nav-actions .btn-primary {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .container {
        padding: 0 24px;
      }
    }

    /* HERO */
    .hero {
      height: 100vh;
      min-height: 720px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: 72px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(10,61,46,0.75) 0%, rgba(10,61,46,0.35) 60%, transparent 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
      color: white;
    }

    .hero h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      line-height: 1.15;
      font-weight: 700;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-family: var(--font-sans);
      font-size: 1.25rem;
      color: var(--accent);
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

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

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s;
    }

    .btn-outline:hover {
      background: var(--accent);
      color: var(--primary);
    }

    .scroll-indicator {
      position: absolute;
      right: 40px;
      bottom: 40px;
      color: white;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(8px); }
    }

    @media (max-width: 768px) {
      .hero {
        min-height: 600px;
      }
      .hero-content {
        padding: 0 16px;
      }
    }

    section {
      padding: var(--gap-section) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    .section-title {
      font-family: var(--font-serif);
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      margin-bottom: 2.5rem;
      color: var(--primary);
    }

    /* FEATURES 2:1:1 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 0;
      border-top: 1px solid var(--border-subtle);
    }

    .feature-item {
      padding: 32px 24px;
      border-bottom: 1px solid var(--border-subtle);
      border-right: 1px solid var(--border-subtle);
      background: var(--bg-white);
    }
    .feature-item:last-child {
      border-right: none;
    }

    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(10,61,46,0.08);
      border-radius: var(--radius-card);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }

    .feature-item h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      margin-bottom: 12px;
    }

    .feature-item p {
      color: var(--text-mid);
    }

    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* PRODUCTS ALTERNATING */
    .product-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .product-row.reverse {
      flex-direction: row-reverse;
    }
    .product-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .product-text {
      flex: 1;
    }
    .product-text h2 {
      font-family: var(--font-serif);
      font-weight: 700;
    }
    .product-specs {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-top: 20px;
    }
    .spec-tag {
      background: rgba(10,61,46,0.06);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.9rem;
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .product-row, .product-row.reverse {
        flex-direction: column;
        gap: 30px;
      }
    }

    /* SCENARIOS HORIZONTAL SCROLL */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .scenario-card {
      flex: 0 0 280px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .scenario-card img {
      height: 180px;
      object-fit: cover;
    }
    .scenario-card h3 {
      padding: 16px 16px 4px;
    }
    .scenario-card p {
      padding: 0 16px 16px;
      color: var(--text-mid);
    }

    /* CASES data+logos */
    .metrics {
      display: flex;
      gap: 40px;
      margin-bottom: 40px;
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-wall {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
    }
    .logo-wall img {
      height: 48px;
    }
    .logo-wall img:hover {
      filter: none;
      opacity: 1;
    }

    /* PRICING */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 24px;
      border: 1px solid var(--border-subtle);
      position: relative;
    }
    .price-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 8px 20px rgba(10,61,46,0.08);
    }
    .badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--alert);
      color: white;
      padding: 2px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
    }
    @media (max-width: 768px) {
      .pricing-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.06);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding-bottom: 20px;
      color: var(--text-mid);
    }

    /* CTA BANNER */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 20px;
    }

    /* FOOTER */
    .footer {
      background: var(--primary);
      color: #E8E3D5;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }