/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-hover: #C1121F;
      --secondary: #1D3557;
      --accent: #F4A261;
      --success: #2A9D8F;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 14px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
      --radius-md: 16px;
      --radius-pill: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      --container-max: 1280px;
      --section-gap: 96px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s ease, background 0.3s;
      border-bottom: 1px solid transparent;
    }

    .nav.scrolled {
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-light);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--secondary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 1.2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--secondary);
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s;
      box-shadow: 0 4px 10px rgba(230,57,70,0.25);
    }

    .btn-nav:hover {
      background: var(--primary-hover);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      border-top: 1px solid var(--border-light);
      padding: 8px 16px;
      justify-content: space-around;
      z-index: 100;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.04);
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-muted);
      gap: 2px;
      font-weight: 500;
    }

    .mobile-nav-item i {
      font-size: 1.3rem;
      color: var(--secondary);
    }

    .mobile-nav-item.active i,
    .mobile-nav-item.active {
      color: var(--primary);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.8rem;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.15;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 36px;
      max-width: 480px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 1.05rem;
      box-shadow: 0 8px 18px rgba(230,57,70,0.3);
      transition: all 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 1.05rem;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: rgba(230,57,70,0.06);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 480px;
      box-shadow: var(--shadow-lg);
      position: relative;
      display: flex;
      align-items: flex-end;
      justify-content: center;
    }

    .mockup-badge {
      background: white;
      border-radius: 20px 20px 0 0;
      padding: 12px 30px;
      font-weight: 600;
      color: var(--secondary);
      box-shadow: 0 -2px 12px rgba(0,0,0,0.05);
    }

    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* 痛点区 */
    .problem-row {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .problem-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .problem-item.reverse {
      direction: rtl;
    }

    .problem-item.reverse .problem-text {
      direction: ltr;
    }

    .problem-text h3 {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--secondary);
    }

    .problem-img {
      background: #e9ecef;
      border-radius: 20px;
      height: 220px;
      background-size: cover;
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .sol-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--primary);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.8rem;
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-md);
      border-left: 5px solid var(--primary);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }

    .feature-card h3 {
      font-size: 1.4rem;
      margin: 12px 0 8px;
      color: var(--secondary);
    }

    /* 数据区 */
    .results-band {
      background: var(--secondary);
      color: white;
      border-radius: 32px;
      padding: 64px 48px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      text-align: center;
    }

    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--accent);
    }

    /* 证言 */
    .testimonials-scroll {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .testimonial-card {
      min-width: 280px;
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .stars {
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      border-left: 4px solid var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, var(--primary) 0%, #1D3557 100%);
      border-radius: 40px;
      padding: 80px 24px;
      text-align: center;
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: #1D3557;
      font-weight: 700;
      padding: 16px 42px;
      border-radius: 50px;
      font-size: 1.2rem;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(244,162,97,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(244,162,97,0); }
      100% { box-shadow: 0 0 0 0 rgba(244,162,97,0); }
    }

    footer {
      background: var(--secondary);
      color: #ddd;
      padding: 64px 0 32px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .problem-item { grid-template-columns: 1fr; }
      .solution-grid, .features-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      .hero { padding: 100px 0 40px; }
      .hero-content h1 { font-size: 2.4rem; }
      .features-grid, .solution-grid { grid-template-columns: 1fr; }
      .results-band { grid-template-columns: 1fr; gap: 32px; }
    }