/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent-gold: #D4AF37;
      --accent-teal: #00C9A7;
      --bg-warm: #F8F6F2;
      --bg-dark: #2B2B2B;
      --text-primary: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8A8A8A;
      --text-light: #B0B0B0;
      --white: #FFFFFF;
      --border-light: #E8E5DF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.1);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --transition-bounce: 0.25s ease;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all var(--transition-bounce);
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      transition: box-shadow 0.3s;
    }
    .header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 20px;
      height: 20px;
      background: var(--accent-gold);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent-teal);
      transition: width var(--transition-smooth);
    }
    .nav-links a:hover {
      color: var(--accent-teal);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent-teal);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      letter-spacing: 0.3px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-bounce);
      border: 2px solid transparent;
    }
    .btn-primary:hover {
      background: #00B395;
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(0,201,167,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--bg-warm);
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .burger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: var(--transition-smooth);
    }
    .mobile-menu {
      display: none;
    }

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

    h1 {
      font-size: clamp(36px, 5vw, 56px);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary);
    }
    h2 {
      font-size: clamp(28px, 4vw, 40px);
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }
    h4 {
      font-weight: 600;
      font-size: 18px;
    }

    .text-accent {
      color: var(--accent-teal);
    }
    .text-gold {
      color: var(--accent-gold);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(26,26,26,0.75) 0%, rgba(26,26,26,0.3) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 80px;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      color: white;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .btn-hero {
      padding: 16px 38px;
      font-size: 18px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .pain-card {
      background: var(--white);
      padding: 28px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-gold);
    }
    .pain-icon {
      font-size: 28px;
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-top: 40px;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    /* 优势 不对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--accent-teal);
      margin-bottom: 20px;
    }
    .sub-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      margin-top: 48px;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-num {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
      transition: transform 0.3s;
    }
    .step:hover .step-num {
      transform: scale(1.1);
    }

    /* 数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      background: var(--white);
      padding: 48px 24px;
      border-radius: var(--radius-lg);
      margin-top: 40px;
    }
    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-teal);
    }

    /* 证言 */
    .testimonial-cards {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .testimonial {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-lg);
      border-left: 6px solid var(--accent-gold);
      font-style: italic;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: var(--white);
      margin-bottom: 8px;
      border-radius: var(--radius-sm);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent-teal);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #FAF9F7;
      padding: 0 20px;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-dark {
      background: var(--bg-dark);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }

    /* Footer */
    .footer {
      background: var(--bg-dark);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent-teal);
    }

    @media (max-width: 1024px) {
      .pain-grid { grid-template-columns: repeat(2,1fr); }
      .features-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav .btn-primary { display: none; }
      .burger { display: flex; }
      .mobile-menu.active { display: flex; flex-direction: column; position: fixed; top:72px; left:0; width:100%; background: var(--primary); padding:32px; gap:24px; }
      .hero-content { flex-direction: column; }
      .pain-grid, .testimonial-cards { grid-template-columns: 1fr; }
      .stats-grid { flex-wrap: wrap; gap:24px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .process-steps { flex-direction: column; gap:24px; }
    }