/* roulang page: index */
:root {
      --primary: #0FE0B6;
      --primary-glow: rgba(15, 224, 182, 0.25);
      --secondary: #C9A96E;
      --dark-bg: #1A1D22;
      --deep-dark: #0F1115;
      --text-primary: #1A1D22;
      --text-secondary: #5A5F66;
      --text-light: #FFFFFF;
      --text-muted: #9CA3AF;
      --bg-white: #FFFFFF;
      --bg-light: #F7F8FA;
      --bg-card: #FFFFFF;
      --border-light: #E5E7EB;
      --border-soft: rgba(255,255,255,0.12);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-lg: 0 16px 32px rgba(0,0,0,0.12);
      --shadow-button: 0 6px 20px rgba(15,224,182,0.3);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-number: "Inter", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      line-height: 1.3;
      margin-bottom: 0.5rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    p {
      color: var(--text-secondary);
      font-size: 1rem;
      margin-bottom: 1.2rem;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
      border-radius: var(--radius-sm);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all var(--transition);
      letter-spacing: 0.02em;
    }
    .btn-primary {
      background-color: var(--primary);
      color: var(--dark-bg);
      box-shadow: 0 4px 14px rgba(15,224,182,0.25);
    }
    .btn-primary:hover {
      background-color: #2ce6c5;
      box-shadow: var(--shadow-button);
      transform: translateY(-1px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid currentColor;
      color: var(--text-light);
      backdrop-filter: blur(8px);
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.08);
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-large {
      padding: 16px 36px;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(26,29,34,0.25);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-soft);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 0 24px;
    }
    .nav.scrolled {
      background: rgba(26,29,34,0.96);
      box-shadow: 0 2px 20px rgba(0,0,0,0.25);
      backdrop-filter: blur(8px);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      height: 70px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: var(--text-light);
      display: flex;
      align-items: baseline;
      gap: 6px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--primary);
    }
    .logo .tagline {
      font-size: 0.75rem;
      font-weight: 400;
      color: var(--secondary);
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: 0.25s ease;
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--dark-bg);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      border-bottom: 1px solid var(--border-soft);
      z-index: 49;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.1rem;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      background: var(--deep-dark);
      background-image: radial-gradient(circle at 80% 20%, rgba(15,224,182,0.18) 0%, transparent 60%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-content {
      flex: 1 1 500px;
      animation: fadeInUp 0.9s both;
    }
    .hero-content h1 {
      color: white;
      margin-bottom: 1.2rem;
    }
    .hero-content .sub {
      font-size: 1.2rem;
      color: #cbd5e1;
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .hero-visual {
      flex: 1 1 450px;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 1px solid rgba(255,255,255,0.08);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(15,224,182,0.15) 0%, transparent 70%);
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }
    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(25px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    /* 痛点区块 */
    .pain-points {
      background: var(--bg-light);
      padding: 80px 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      text-align: center;
    }
    .stat-item h3 {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }
    .stat-item p {
      font-weight: 500;
      color: var(--text-secondary);
      margin: 0;
    }
    /* 解决方案 */
    .solutions {
      padding: 100px 0;
      background: var(--bg-white);
    }
    .solutions-layout {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }
    .solution-main {
      flex: 1.2;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: all var(--transition);
    }
    .solution-main:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .solution-main img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .solution-main .card-text {
      padding: 28px;
    }
    .solution-side {
      flex: 0.9;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .side-item {
      border-left: 4px solid var(--primary);
      padding-left: 20px;
    }
    .side-item h3 {
      margin-bottom: 6px;
    }
    /* 数据带 */
    .results {
      background: var(--dark-bg);
      padding: 90px 0;
      color: white;
    }
    .results h2 {
      color: white;
      text-align: center;
      margin-bottom: 48px;
    }
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric span {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }
    .metric p {
      color: #cbd5e1;
      font-weight: 500;
    }
    /* 证言 */
    .testimonials {
      padding: 100px 0;
      background: var(--bg-light);
    }
    .testimonial-card {
      display: flex;
      gap: 32px;
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      align-items: center;
      flex-wrap: wrap;
    }
    .quote {
      font-size: 1.2rem;
      font-style: italic;
      position: relative;
      flex: 2;
    }
    .quote::before {
      content: "“";
      font-size: 5rem;
      color: var(--primary);
      opacity: 0.15;
      position: absolute;
      left: -12px;
      top: -24px;
    }
    .author {
      font-weight: 600;
      color: var(--secondary);
    }
    /* FAQ */
    .faq {
      padding: 100px 0;
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: white;
      transition: background 0.2s;
    }
    .faq-question {
      width: 100%;
      padding: 22px 10px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      border: none;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.25s ease;
      padding: 0 10px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      font-size: 1.5rem;
      transition: 0.2s;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A1D22 0%, #0F1115 100%);
      padding: 100px 0;
      text-align: center;
    }
    .cta-section h2 {
      color: white;
    }
    .footer {
      background: var(--dark-bg);
      color: var(--text-muted);
      padding: 48px 0 24px;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    .footer a {
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .solutions-layout {
        flex-direction: column;
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero .container { flex-direction: column; }
      .hero-visual { min-height: 260px; width: 100%; }
    }
    @media (max-width: 520px) {
      .metric-grid { grid-template-columns: 1fr; }
      .cta-group { flex-direction: column; align-items: flex-start; }
    }