/* roulang page: index */
:root {
      --primary: #1B7E4B;
      --primary-dark: #156A3D;
      --accent: #C89B3C;
      --bg-warm: #F5F1EB;
      --text-dark: #1E1E1E;
      --text-muted: #5C5C5C;
      --white: #FFFFFF;
      --border-light: #E8E3DC;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-mono: 'Inter', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

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

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

    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-dark);
    }

    h2 {
      font-size: 32px;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    h3 {
      font-size: 22px;
      color: var(--text-dark);
    }

    p {
      color: var(--text-muted);
      margin-bottom: 1rem;
    }

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

    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-lg);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      h3 {
        font-size: 18px;
      }
      body {
        font-size: 15px;
      }
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .logo i {
      font-size: 24px;
      color: var(--primary);
      transform: rotate(-15deg);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease, left 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
      left: 0;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav {
        height: 56px;
      }
      .nav-links {
        position: fixed;
        top: 56px;
        left: 0;
        width: 100%;
        height: calc(100vh - 56px);
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        font-size: 20px;
      }
      .nav-links.open {
        transform: translateX(0);
      }
      .hamburger {
        display: block;
      }
      .nav-container {
        padding: 0 20px;
      }
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      cursor: pointer;
      border: 1.5px solid transparent;
      min-width: 140px;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(27,126,75,0.06);
    }

    .btn-white {
      background: white;
      color: var(--primary);
      border-color: white;
    }

    .btn-white-outline {
      background: transparent;
      color: white;
      border-color: white;
    }

    @media (max-width: 768px) {
      .btn {
        width: 100%;
        min-height: 48px;
        padding: 12px 20px;
      }
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      background: linear-gradient(135deg, #F5F1EB 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }
    .hero-image {
      border-radius: 80px 20px 80px 20px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(0,0,0,0.08);
      animation: float 6s ease-in-out infinite;
      background: #e0d7cd;
      aspect-ratio: 4/3;
    }
    .hero-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

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

    .light-spot {
      position: absolute;
      top: -100px;
      right: -80px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(27,126,75,0.12) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-buttons {
        flex-direction: column;
      }
      .hero-image {
        border-radius: 40px 10px 40px 10px;
      }
    }

    /* 优势错位 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .adv-large {
      grid-row: span 2;
    }
    .adv-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .adv-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .adv-large {
        grid-row: span 1;
      }
    }

    /* 功能图文 */
    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .feature-img {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      background: #e2d9cd;
    }
    .feature-list {
      list-style: none;
      margin-top: 16px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      color: var(--text-dark);
    }
    .feature-list i {
      color: var(--primary);
    }
    .tag {
      background: rgba(27,126,75,0.08);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      display: inline-block;
      margin-right: 8px;
    }
    @media (max-width: 768px) {
      .feature-row {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .feature-row.reverse {
        display: flex;
        flex-direction: column-reverse;
      }
    }

    /* 场景卡片 */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .scenario-card {
      flex: 0 0 320px;
      background: white;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      scroll-snap-align: start;
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      height: 180px;
      background-size: cover;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }
    .scenario-content {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .scenario-card {
        flex: 0 0 260px;
      }
    }

    /* 数据案例 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-mono);
    }
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      background: white;
      padding: 24px;
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .case-quote {
      font-style: italic;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
      .stat-number {
        font-size: 36px;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: 0.3s;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .cta-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 20px;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .ring-animation {
      position: absolute;
      top: 50%;
      left: 50%;
      width: 300px;
      height: 300px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      transform: translate(-50%, -50%) scale(1);
      animation: pulse-ring 3s infinite;
    }
    @keyframes pulse-ring {
      0% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.5; }
      100% { transform: translate(-50%, -50%) scale(1.8); opacity: 0; }
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      padding: 48px 0 24px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid var(--border-light);
      padding: 20px 0;
      text-align: center;
      font-size: 14px;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }