/* roulang page: index */
:root {
      --primary: #E8380F;
      --primary-dark: #C92D0A;
      --secondary-dark: #1A1A2E;
      --gold: #F5A623;
      --bg-light: #FAFAFA;
      --bg-dark: #0F0F1A;
      --text-main: #1A1A2E;
      --text-muted: #5A5A6E;
      --text-on-dark: #FFFFFF;
      --border-light: #E8E8EC;
      --shadow-sm: 0 2px 12px rgba(26,26,46,0.06);
      --shadow-md: 0 8px 30px rgba(232,56,15,0.15);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: white;
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
    }
    .logo img {
      width: 32px;
      height: 32px;
    }
    .nav-desktop {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.25s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .btn-cta-pill {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 500;
      font-size: 14px;
      transition: background 0.25s, transform 0.25s;
    }
    .btn-cta-pill:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 10px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--secondary-dark);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
      transform: translateY(-10px);
      opacity: 0;
      pointer-events: none;
      transition: 0.3s ease;
    }
    .mobile-menu.active {
      display: flex;
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .nav-desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 500;
      display: inline-block;
      transition: background 0.25s, transform 0.25s, box-shadow 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(232,56,15,0.25);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      font-weight: 500;
      display: inline-block;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(232,56,15,0.08);
    }
    .btn-large {
      background: linear-gradient(135deg, var(--gold), var(--primary));
      color: white;
      border-radius: var(--radius-pill);
      padding: 18px 48px;
      font-size: 18px;
      font-weight: 700;
      display: inline-block;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .btn-large:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 35px rgba(245,166,35,0.4);
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* 首屏 */
    .hero {
      background: linear-gradient(90deg, #FAFAFA 60%, rgba(232,56,15,0.08) 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(245,166,35,0.15);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 500;
      padding: 4px 16px;
      border-radius: 20px;
      margin-bottom: 24px;
    }
    .hero-tag i {
      color: var(--gold);
      font-size: 8px;
    }
    h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 520px;
      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: 24px;
      height: 400px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.15);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        height: 280px;
        order: -1;
      }
      h1 {
        font-size: 36px;
      }
    }
    /* 痛点区 */
    .pain-section {
      background: var(--bg-dark);
      color: white;
    }
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .pain-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: 0.3s;
    }
    .pain-card:hover {
      border-color: var(--primary);
      background: rgba(255,255,255,0.08);
    }
    .pain-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      border-top: 4px solid transparent;
      border-image: linear-gradient(to right, var(--primary), var(--gold)) 1;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    @media (max-width: 1024px) {
      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据区 */
    .stats-band {
      background: white;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 30px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 64px;
      background: linear-gradient(135deg, #F5A623, #E8380F);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .testimonial-card {
      background: white;
      border-radius: 12px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
    }
    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0F0F1A, #B82A0A);
      text-align: center;
      color: white;
    }
    .footer {
      background: var(--secondary-dark);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }