/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-light: #1F4A3E;
      --accent: #F27A3E;
      --accent-hover: #E0692F;
      --bg: #FAF7F2;
      --card-bg: #FFFFFF;
      --text: #2C2C2C;
      --text-secondary: #5C5C5C;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 40px;
      --transition: 0.3s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --max-width: 1280px;
      --section-gap: 100px;
      --section-gap-mobile: 60px;
    }

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

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航：桌面端顶部沉浸式，移动端底部胶囊 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      font-size: 28px;
      line-height: 1;
    }

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

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

    .desktop-nav a:hover {
      color: var(--accent);
    }

    .desktop-nav a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }

    .desktop-nav a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--accent);
      color: #fff;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition), transform 0.2s ease;
    }

    .btn-nav:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
    }

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: #FFFFFF;
      border-radius: 24px;
      padding: 8px 24px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.08);
      z-index: 1001;
      backdrop-filter: blur(10px);
      width: auto;
      max-width: 95vw;
    }

    .mobile-bottom-nav ul {
      display: flex;
      gap: 24px;
      list-style: none;
      justify-content: center;
    }

    .mobile-bottom-nav a {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-secondary);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      padding: 6px 8px;
      border-radius: 20px;
      transition: color 0.2s;
    }

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

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
      line-height: 1.25;
    }

    .section-subtitle {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 600px;
      margin-bottom: 48px;
    }

    /* Hero */
    #hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #1A3C34 0%, #0F2922 100%);
      position: relative;
      overflow: hidden;
      color: white;
    }

    #hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(/%23noise)' opacity='0.08'/%3E%3C/svg%3E");
      opacity: 0.5;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 32px;
      color: rgba(255,255,255,0.9);
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: #fff;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition), transform 0.2s ease;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
    }

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

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      background: #1a2e2a;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

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

    .pain-icon {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* 解决方案交替布局 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .solution-row.reverse {
      direction: rtl;
    }
    .solution-row.reverse > * {
      direction: ltr;
    }

    .solution-img img {
      border-radius: 20px;
      background: #E8EDEA;
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
    }

    .data-highlight {
      color: var(--accent);
      font-weight: 800;
      font-size: 28px;
    }

    /* 数据徽章墙 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: #F4F6F5;
      border-left: 4px solid var(--accent);
      padding: 28px;
      border-radius: 16px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .avatar-placeholder {
      width: 56px;
      height: 56px;
      background: #dce5e1;
      border-radius: 50%;
      flex-shrink: 0;
    }

    .quote {
      font-style: italic;
      margin-bottom: 12px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: var(--card-bg);
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      list-style: none;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-icon {
      color: var(--accent);
      font-weight: bold;
      font-size: 20px;
    }

    /* CTA 区域 */
    #cta {
      background: linear-gradient(135deg, #1A3C34, #1F4A3E);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .site-footer {
      background: #2C2C2C;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .solution-row, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .pain-grid { grid-template-columns: 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: block; }
      .site-header { background: rgba(255,255,255,0.98); height: 64px; }
      #hero { padding: 100px 0 60px; }
      .section-title { font-size: 28px; }
      .stat-number { font-size: 40px; }
    }

    @media (max-width: 480px) {
      .hero-title { font-size: 32px; }
    }