/* roulang page: index */
:root {
      --primary: #D42E1A;
      --primary-hover: #B82515;
      --secondary-bg: #1A1A2E;
      --warm-bg: #F5F0E8;
      --accent-gold: #FFB800;
      --text-dark: #2C2C2C;
      --text-light: #FFFFFF;
      --success-green: #0F9D58;
      --border-light: rgba(0,0,0,0.08);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'Roboto', 'PingFang SC', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      color: var(--text-dark);
      background-color: #FFFFFF;
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: var(--primary);
      transition: color 0.2s ease;
    }

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

    /* 导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo span {
      color: var(--text-dark);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      padding: 8px 0;
      position: relative;
      font-size: 0.95rem;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      text-align: center;
      cursor: pointer;
      border: 2px solid transparent;
      font-family: var(--font-body);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      box-shadow: 0 4px 12px rgba(212,46,26,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 20px rgba(184,37,21,0.4);
      transform: translateY(-2px);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary);
      color: var(--primary);
      padding: 14px 32px;
    }

    .btn-outline:hover {
      background: rgba(212,46,26,0.08);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
    }

    .btn-large {
      padding: 18px 48px;
      font-size: 1.1rem;
      background: white;
      color: var(--primary);
      border: none;
      font-weight: 700;
    }

    .btn-large:hover {
      background: var(--accent-gold);
      color: #1A1A2E;
      transform: scale(1.05);
      box-shadow: 0 12px 24px rgba(0,0,0,0.2);
    }

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

    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
      color: var(--text-dark);
    }

    .section-subtitle {
      text-align: center;
      color: #666;
      max-width: 640px;
      margin: 0 auto 3rem auto;
      font-size: 1.1rem;
    }

    @media (max-width: 768px) {
      section { padding: 60px 0; }
      .section-title { font-size: 1.8rem; }
    }

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

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      padding: 32px 24px;
    }

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

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to right, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.35) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-content p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      #hero { height: 90vh; }
      .hero-content h1 { font-size: 2rem; }
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .pain-card {
      background: var(--warm-bg);
      border-radius: 16px;
      padding: 32px 24px;
      display: flex;
      align-items: flex-start;
      gap: 20px;
      transition: 0.2s;
    }

    .pain-icon {
      width: 56px;
      height: 56px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.8rem;
      flex-shrink: 0;
    }

    .pain-text h3 {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }

    .solution-card ul {
      margin-top: 12px;
      padding-left: 20px;
      color: #444;
    }

    /* 数据区 */
    #results {
      background: var(--secondary-bg);
      color: white;
      text-align: center;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scrollbar-width: thin;
    }

    .testimonial-card {
      min-width: 340px;
      background: white;
      border-radius: 16px;
      padding: 28px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .testimonial-avatar {
      width: 60px;
      height: 60px;
      background: #ddd;
      border-radius: 50%;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-weight: 700;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
    }

    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      line-height: 1.8;
      color: #444;
    }

    .faq-item.active .faq-answer {
      display: block;
      background: var(--warm-bg);
    }

    .faq-item.active .faq-question {
      background: var(--warm-bg);
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, var(--primary) 0%, #b31212 100%);
      color: white;
      text-align: center;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      color: #ddd;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      color: #aaa;
    }

    @media (max-width: 1024px) {
      .grid-3, .pain-grid, .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-4, .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .grid-3, .pain-grid, .solution-grid, .grid-4, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-content h1 { font-size: 2rem; }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(26,26,46,0.95);
      backdrop-filter: blur(10px);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      z-index: 40;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }

    .show-mobile {
      display: flex;
    }