/* roulang page: index */
:root {
      --primary: #E84C22;
      --primary-dark: #c43d18;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --bg: #F9F9FB;
      --card-bg: #FFFFFF;
      --card-alt-bg: #F0F1F5;
      --text: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #8A8A9A;
      --success: #2EAD77;
      --border-light: #E8E8EF;
      --shadow-card: 0 4px 20px rgba(26, 26, 46, 0.08);
      --shadow-card-hover: 0 8px 32px rgba(26, 26, 46, 0.14);
      --shadow-nav: 0 2px 12px rgba(0, 0, 0, 0.08);
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 100px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      margin: 0;
      padding: 0;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
      transition: all 0.25s ease;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 999;
      transition: box-shadow 0.3s ease, background 0.3s;
    }

    .main-header.scrolled {
      box-shadow: var(--shadow-nav);
      background: rgba(255, 255, 255, 0.98);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      font-size: 15px;
      color: var(--text);
    }

    .desktop-nav a {
      padding: 6px 0;
      position: relative;
    }

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

    .desktop-nav a:hover::after,
    .desktop-nav a.active::after {
      width: 100%;
    }

    .btn-primary-nav {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.3px;
      box-shadow: 0 2px 8px rgba(232, 76, 34, 0.25);
      margin-left: 12px;
    }

    .btn-primary-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 14px rgba(232, 76, 34, 0.4);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 28px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px 0;
    }

    .hamburger span {
      display: block;
      height: 2px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.25s ease;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      font-size: 22px;
      font-weight: 600;
      color: var(--secondary);
      transform: translateY(-100%);
      transition: transform 0.35s ease;
      z-index: 1000;
    }

    .mobile-menu.open {
      transform: translateY(0);
    }

    .mobile-menu a {
      color: var(--secondary);
    }

    .mobile-close {
      position: absolute;
      top: 24px;
      right: 32px;
      font-size: 32px;
      background: none;
      border: none;
      color: var(--secondary);
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav-container {
        padding: 0 20px;
      }
    }

    /* Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
      margin-top: 64px;
      padding: 120px 0 140px;
      color: white;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.8) 0%, rgba(26,26,46,0.4) 100%);
    }

    .hero-content {
      position: relative;
      max-width: 700px;
      z-index: 2;
    }

    .hero h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      color: rgba(255,255,255,0.9);
      margin-bottom: 36px;
    }

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

    .btn-hero-primary {
      background: var(--primary);
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 16px;
      letter-spacing: 0.5px;
      box-shadow: 0 6px 18px rgba(232, 76, 34, 0.5);
    }

    .btn-hero-secondary {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 16px;
    }

    @media (max-width: 768px) {
      .hero {
        padding: 80px 0 100px;
      }
      .hero h1 {
        font-size: 32px;
      }
    }

    /* 通用区块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--primary);
      border-radius: 2px;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 16px;
      margin-bottom: 48px;
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .solution-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

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

    .card-icon {
      width: 56px;
      height: 56px;
      background: #FFF3E0;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 28px;
      transition: background 0.25s;
    }

    .solution-card:hover .card-icon {
      background: var(--primary);
      color: white;
    }

    .card-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }

    @media (max-width: 1024px) {
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      background: var(--card-bg);
      padding: 36px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: -0.5px;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 15px;
      margin-top: 10px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: var(--card-alt-bg);
      padding: 28px;
      border-radius: var(--radius-md);
      position: relative;
    }

    .quote-mark {
      font-size: 56px;
      color: var(--primary);
      opacity: 0.7;
      position: absolute;
      top: 8px;
      left: 18px;
    }

    .testimonial-text {
      font-style: italic;
      margin: 24px 0 18px;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 44px;
      height: 44px;
      background: #ccc;
      border-radius: 50%;
      background-image: url('/assets/images/coverpic/cover-4.webp');
      background-size: cover;
    }

    @media (max-width: 768px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: var(--card-bg);
      border-radius: 0;
      margin-bottom: 4px;
    }

    .faq-question {
      width: 100%;
      padding: 20px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 17px;
      color: var(--text);
      background: transparent;
      text-align: left;
    }

    .faq-icon {
      font-size: 22px;
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #F9F9FB;
      padding: 0 16px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 区 */
    .cta-block {
      background: linear-gradient(135deg, #1A1A2E 0%, #2C2C44 100%);
      color: white;
      text-align: center;
      padding: 90px 0;
      position: relative;
      overflow: hidden;
    }

    .cta-block h2 {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .btn-cta-large {
      background: var(--accent);
      color: #1A1A2E;
      padding: 18px 52px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 18px;
      margin-top: 28px;
      display: inline-block;
    }

    /* 页脚 */
    .footer {
      background: #1A1A2E;
      color: #B0B0C0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      color: white;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 12px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 60px 0;
      }
    }

    .no-scroll {
      overflow: hidden;
    }