/* roulang page: index */
:root {
      --primary: #FF6B4A;
      --primary-hover: #E55A3C;
      --primary-light: #FFF0EB;
      --secondary: #1A2744;
      --secondary-deep: #141E33;
      --accent: #F5A623;
      --bg-warm: #FAFAF8;
      --white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-muted: #5F6B7A;
      --text-light: #FFD4C2;
      --border-light: #E8EBF0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 28px rgba(0,0,0,0.08);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.06);
      --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 { font-weight: 600; }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
    }
    p {
      color: var(--text-muted);
      line-height: 1.8;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.25s ease;
    }
    a:hover {
      color: var(--primary-hover);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    #main-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: none;
      transition: box-shadow 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    #main-nav.scrolled {
      box-shadow: var(--shadow-nav);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: var(--secondary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      position: relative;
    }
    .logo-icon::before {
      content: "🐟";
      filter: brightness(0) invert(1);
      transform: scale(1.1);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-sm);
      font-weight: 700;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255,107,74,0.3);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: 0.3s;
    }
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      z-index: 200;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
    }
    .mobile-menu.open {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--secondary);
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      cursor: pointer;
    }
    /* Hero */
    #hero {
      padding: 80px 0;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 18px;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255,107,74,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 18px;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .hero-image {
      flex: 0.9;
      position: relative;
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(255,107,74,0.15);
    }
    .hero-decor {
      position: absolute;
      width: 300px;
      height: 300px;
      background: rgba(255,107,74,0.08);
      border-radius: 50%;
      top: -40px;
      right: -40px;
      z-index: 0;
    }
    /* 通用section */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .bg-dark {
      background: var(--secondary);
      color: white;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .pain-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      transition: 0.25s;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .pain-icon {
      font-size: 40px;
      color: var(--primary);
    }
    /* 解决方案交错 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .solution-text {
      flex: 1;
    }
    .check-list {
      list-style: none;
      margin-top: 20px;
    }
    .check-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      font-size: 16px;
    }
    .check-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }
    /* 功能滚动 */
    .scroll-container {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-container::-webkit-scrollbar { display: none; }
    .feature-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      scroll-snap-align: start;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }
    .feature-card:hover {
      transform: scale(1.02);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(255,107,74,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
      gap: 32px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-light);
      margin-top: 8px;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }
    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 16px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #ddd;
      border-radius: 50%;
      background-image: url('/assets/images/coverpic/cover-3.webp');
      background-size: cover;
    }
    .quote {
      border-left: 4px solid var(--primary);
      padding-left: 16px;
      font-style: italic;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    details {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
      transition: 0.3s;
    }
    details summary {
      font-weight: 600;
      font-size: 18px;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    details summary::after {
      content: "+";
      font-size: 24px;
      transition: 0.3s;
    }
    details[open] summary::after {
      transform: rotate(45deg);
    }
    details .answer {
      padding-top: 16px;
      color: var(--text-muted);
    }
    /* CTA */
    .cta-content {
      text-align: center;
    }
    .download-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin: 32px 0;
    }
    .btn-capsule {
      background: rgba(255,255,255,0.15);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: 0.25s;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .btn-capsule:hover {
      background: rgba(255,255,255,0.25);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      color: #ccc;
    }
    .footer-links a {
      display: block;
      color: #aaa;
      margin-bottom: 8px;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      #main-nav { height: 60px; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      section { padding: 60px 0; }
      .pain-grid, .testimonial-grid, .stats-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-image { order: -1; }
    }