/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-light: #2A5A4A;
      --accent-gold: #D4A853;
      --accent-gold-light: rgba(212, 168, 83, 0.12);
      --warm-bg: #F5F0E8;
      --alert-red: #C44D34;
      --text-dark: #2B2B2B;
      --text-muted: #5C5C5C;
      --border-soft: #E2DDD4;
      --white: #ffffff;
      --footer-bg: #1A2A26;
      --footer-text: #B0B8B5;
      --radius-card: 18px;
      --radius-btn: 40px;
      --shadow-sm: 0 6px 24px rgba(0,0,0,0.05);
      --shadow-hover: 0 14px 36px rgba(0,0,0,0.10);
      --transition: all 0.28s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-data: 'Inter', 'Noto Sans SC', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nb88-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-soft);
      z-index: 50;
      padding: 12px 0;
      transition: var(--transition);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      font-size: 1rem;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent-gold);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 26px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(26,60,52,0.2);
      border-bottom: none !important;
    }
    .nav-cta:hover {
      background: var(--primary-light);
      color: white !important;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    /* Hero */
    .hero {
      min-height: 85vh;
      background: linear-gradient(135deg, rgba(26,60,52,0.75) 0%, rgba(26,42,38,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 70px;
    }
    .hero-content {
      max-width: 700px;
      padding: 20px 0;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      opacity: 0.92;
      margin-bottom: 2rem;
      font-weight: 400;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      align-items: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      display: inline-block;
      box-shadow: 0 8px 18px rgba(0,0,0,0.1);
    }
    .btn-primary:hover {
      background: var(--primary-light);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--accent-gold-light);
      color: var(--accent-gold);
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      font-size: 2.4rem;
      margin-bottom: 3rem;
      color: var(--primary);
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .pain-card {
      background: var(--warm-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-left: 6px solid var(--accent-gold);
    }
    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .pain-card i {
      font-size: 2.4rem;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text, .solution-img {
      flex: 1;
    }
    .solution-img img {
      width: 100%;
      border-radius: 24px;
      box-shadow: var(--shadow-sm);
    }
    /* 成果数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--primary);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 30px;
    }
    .testimonial-card {
      background: #fafaf8;
      padding: 28px;
      border-radius: var(--radius-card);
      font-style: italic;
    }
    /* FAQ */
    .accordion-faq {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
    }
    .faq-question {
      background: var(--warm-bg);
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 20px;
    }
    @media (max-width: 1024px) {
      .pain-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.8rem; }
      .solution-row { flex-direction: column; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }