/* roulang page: index */
:root {
      --color-pitch-green: #1B8B3D;
      --color-deep-green: #0E4A24;
      --color-scoreboard-yellow: #F5C518;
      --color-spotlight-white: #F0F4F0;
      --color-night-black: #111613;
      --color-text-gray: #5A6B5F;
      --color-border-gray: #D0D9D2;
      --color-bg-light: #F7FAF8;
      --font-heading: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --shadow-card: 0 2px 12px rgba(14, 74, 36, 0.08);
      --shadow-card-hover: 0 6px 24px rgba(14, 74, 36, 0.15);
      --shadow-button: 0 4px 16px rgba(27, 139, 61, 0.35);
      --border-radius-lg: 12px;
      --border-radius-md: 8px;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-body);
      background-color: #ffffff;
      color: var(--color-night-black);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 排版 */
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: 0.02em;
    }

    h1 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      line-height: 1.2;
      color: white;
    }

    h2 {
      font-size: clamp(1.5rem, 3.5vw, 2.25rem);
      line-height: 1.3;
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }

    h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 60px;
      height: 3px;
      background-color: var(--color-pitch-green);
      border-radius: 4px;
    }

    h3 {
      font-size: 1.25rem;
      line-height: 1.4;
      margin-bottom: 0.5rem;
      color: var(--color-deep-green);
    }

    h4 {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--color-night-black);
    }

    p {
      margin-bottom: 1.25em;
      color: var(--color-text-gray);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      transition: var(--transition-smooth);
      border: none;
    }

    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: white;
      border-bottom: 1px solid transparent;
      transition: var(--transition-smooth);
      padding: 0.8rem 0;
    }

    #nav.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.08);
      border-bottom-color: var(--color-border-gray);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-pitch-green);
    }

    .logo i {
      font-size: 1.75rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--color-text-gray);
      font-weight: 500;
    }

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

    .btn-primary {
      background: var(--color-pitch-green);
      color: white;
      padding: 10px 22px;
      border-radius: var(--border-radius-md);
      font-weight: 700;
      font-size: 0.95rem;
      box-shadow: 0 2px 8px rgba(27,139,61,0.2);
    }

    .btn-primary:hover {
      background: #157A34;
      transform: translateY(-1px);
      box-shadow: var(--shadow-button);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-pitch-green);
      color: var(--color-pitch-green);
      padding: 10px 22px;
      border-radius: var(--border-radius-md);
      font-weight: 700;
    }

    .btn-outline:hover {
      background: var(--color-pitch-green);
      color: white;
    }

    .btn-yellow {
      background: var(--color-scoreboard-yellow);
      color: var(--color-night-black);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--border-radius-md);
      box-shadow: 0 4px 12px rgba(245,197,24,0.3);
    }

    .btn-yellow:hover {
      filter: brightness(1.08);
      transform: translateY(-1px);
      box-shadow: 0 8px 20px rgba(245,197,24,0.4);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--color-pitch-green);
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0E4A24 0%, #1B8B3D 100%);
      position: relative;
      overflow: hidden;
      padding: 80px 0 100px;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><path d="M0 20 L20 0 L40 20" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="2"/></svg>');
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text p {
      color: rgba(255,255,255,0.85);
      font-size: 1.2rem;
      margin: 1.2rem 0;
    }

    .trust-badge {
      display: flex;
      gap: 2rem;
      color: var(--color-scoreboard-yellow);
      font-weight: 600;
      margin: 1.5rem 0 2rem;
      font-size: 0.95rem;
    }

    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1;
      text-align: center;
    }

    .hero-image img {
      max-height: 420px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-header h2 {
      display: inline-block;
    }

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

    .card {
      background: white;
      border-radius: var(--border-radius-lg);
      padding: 28px;
      border: 1px solid var(--color-border-gray);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--color-pitch-green);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--color-pitch-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
      margin-bottom: 1.25rem;
    }

    .card:hover .icon-circle {
      background: var(--color-scoreboard-yellow);
      color: #111;
    }

    /* 场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 4rem;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      border: 2px solid var(--color-border-gray);
    }

    .scenario-content {
      flex: 1;
    }

    .tag {
      display: inline-block;
      background: var(--color-bg-light);
      color: var(--color-deep-green);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
    }

    /* 数据墙 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin: 2rem 0;
    }

    .stat-item {
      text-align: center;
      background: white;
      padding: 2rem;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--color-scoreboard-yellow);
      font-variant-numeric: tabular-nums;
    }

    .testimonial-card {
      background: var(--color-bg-light);
      padding: 24px;
      border-radius: var(--border-radius-md);
      display: flex;
      gap: 16px;
      align-items: center;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }

    .pricing-card {
      background: white;
      border-radius: var(--border-radius-lg);
      padding: 32px;
      border: 1.5px solid var(--color-border-gray);
      position: relative;
      box-shadow: var(--shadow-card);
    }

    .pricing-card.featured {
      border-color: var(--color-pitch-green);
      transform: scale(1.02);
      box-shadow: var(--shadow-card-hover);
    }

    .badge {
      position: absolute;
      top: -14px;
      right: 20px;
      background: var(--color-scoreboard-yellow);
      color: #111;
      padding: 4px 16px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--color-border-gray);
      padding: 1.2rem 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--color-bg-light);
      border-radius: var(--border-radius-md);
      margin-top: 0.5rem;
      padding: 0 16px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA 底栏 */
    #cta {
      background: linear-gradient(135deg, #0E4A24 0%, #1B8B3D 100%);
      text-align: center;
      padding: 90px 0;
    }

    #cta h2 {
      color: white;
      margin-bottom: 1rem;
    }

    #cta h2::after { display: none; }

    /* footer */
    #footer {
      background: var(--color-night-black);
      color: #b0bfb5;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    #footer a:hover {
      color: var(--color-scoreboard-yellow);
    }

    @media (max-width: 1024px) {
      .grid-3, .pricing-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .grid-3, .stats-grid, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn { width: 100%; text-align: center; }
    }