/* roulang page: index */
:root {
      --primary: #1A5F2A;
      --primary-dark: #154D23;
      --accent-gold: #E8B830;
      --accent-gold-hover: #D4A828;
      --charcoal: #0A0E17;
      --text-primary: #1A1A1A;
      --text-secondary: #4A4A4A;
      --bg-light: #F5F7F5;
      --bg-white: #FFFFFF;
      --border-light: #E0E4E0;
      --border-card: #E8ECEA;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 24px rgba(26, 95, 42, 0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", system-ui;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      height: 64px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      box-shadow: 0 1px 0 rgba(0,0,0,0.02);
    }
    .nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom-color: var(--border-light);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.3px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--charcoal);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-primary);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 8px 22px;
      font-weight: 600;
      font-size: 14px;
      transition: var(--transition);
      border: none;
      white-space: nowrap;
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(26,95,42,0.3);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--charcoal);
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(26,95,42,0.15);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 18px rgba(26,95,42,0.3);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-md);
      padding: 12px 30px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      background: rgba(26,95,42,0.08);
    }
    .btn-gold {
      background: var(--accent-gold);
      color: var(--charcoal);
      border-radius: var(--radius-md);
      padding: 18px 48px;
      font-weight: 700;
      font-size: 18px;
      border: none;
      transition: var(--transition);
      box-shadow: 0 6px 16px rgba(232,184,48,0.25);
    }
    .btn-gold:hover {
      background: var(--accent-gold-hover);
      transform: translateY(-3px);
      box-shadow: 0 12px 24px rgba(232,184,48,0.35);
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    h2 {
      font-size: 28px;
      line-height: 40px;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 16px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 16px;
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, #FFFFFF 0%, #F5F7F5 100%);
      min-height: 80vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero h1 {
      font-size: 36px;
      line-height: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--charcoal);
    }
    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 16px;
      height: 400px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.1);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-white);
      padding: 28px 24px;
      border-radius: var(--radius-lg);
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--accent-gold);
    }
    .pain-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-card);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .solution-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .solution-text {
      padding: 20px;
    }

    /* 成果深色块 */
    .results {
      background: var(--charcoal);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-gold);
      font-family: var(--font-number);
      line-height: 1.2;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-light);
      padding: 28px;
      border-radius: var(--radius-lg);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 48px;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 10px;
      left: 20px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--charcoal);
      text-align: center;
      color: white;
    }

    footer {
      background: var(--charcoal);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .btn-nav { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .pain-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .solution-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 28px; }
      h2 { font-size: 22px; }
    }