/* roulang page: index */
:root {
      --primary-deep: #0A4C4A;
      --primary-mid: #073534;
      --accent-coral: #FF6B4A;
      --accent-hover: #E55A3A;
      --bg-warm: #F7F5F2;
      --white: #FFFFFF;
      --text-main: #1E2B2A;
      --text-soft: #5F6C6A;
      --border-light: #E0DDD8;
      --shadow-card: 0 2px 12px rgba(7, 53, 52, 0.06);
      --shadow-hover: 0 8px 24px rgba(7, 53, 52, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.25s ease, box-shadow 0.25s ease;
      padding: 16px 0;
    }
    #header.scrolled {
      background: rgba(255,255,255,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      backdrop-filter: blur(8px);
    }
    #header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: 0.5px;
    }
    #header.scrolled .logo {
      color: var(--primary-deep);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-coral);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .logo-icon::after {
      content: "●";
      color: white;
      font-size: 18px;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: rgba(255,255,255,0.85);
      position: relative;
      padding-bottom: 4px;
    }
    #header.scrolled .nav-links a {
      color: var(--text-main);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--accent-coral);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(10, 76, 74, 0.92);
      backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 8px 20px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.25);
      z-index: 110;
      justify-content: space-around;
    }
    .mobile-nav a {
      color: white;
      font-size: 0.7rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      font-weight: 500;
    }
    /* 区块通用 */
    section {
      padding: 90px 0;
    }
    h2 {
      font-size: 2.25rem;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }
    .section-sub {
      color: var(--text-soft);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--accent-coral);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #073534 0%, #0A4C4A 100%);
      color: white;
      padding: 140px 0 100px;
      position: relative;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background: rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 16px;
      backdrop-filter: blur(8px);
      box-shadow: 0 20px 35px rgba(0,0,0,0.3);
    }
    .hero-visual img {
      border-radius: 16px;
      width: 100%;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .pain-item {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .pain-icon {
      font-size: 2rem;
      margin-bottom: 12px;
    }
    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      position: relative;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      font-size: 2.5rem;
      color: var(--accent-coral);
      margin-bottom: 20px;
      transition: transform 0.3s;
    }
    .solution-card:hover .solution-icon {
      transform: scale(1.1);
    }
    .solution-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .learn-more {
      color: var(--accent-coral);
      font-weight: 600;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    /* 数据成果 */
    .data-grid {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .data-stats {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-coral);
    }
    .data-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      min-width: 280px;
      background: white;
      padding: 24px;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }
    .partner-strip {
      display: flex;
      justify-content: space-between;
      margin-top: 40px;
      opacity: 0.8;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: var(--primary-deep);
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-soft);
    }
    .faq-item.open .faq-answer {
      max-height: 120px;
      margin-top: 8px;
    }
    /* CTA */
    #cta {
      background: #073534;
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      color: #ccc;
    }
    footer {
      background: #073534;
      padding: 60px 0 20px;
    }
    @media (max-width: 1024px) {
      .solutions-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      h1 { font-size: 2rem; }
      .hero-grid, .data-grid { flex-direction: column; }
      .pain-grid, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }