/* roulang page: index */
:root {
      --primary-orange: #F04E30;
      --primary-deep: #D43D20;
      --dark-blue: #1A1D2E;
      --dark-blue-soft: #2A2F45;
      --teal-green: #00C9A7;
      --gold-amber: #F7B731;
      --gray-bg: #F8F9FC;
      --gray-light: #F2F3F7;
      --white: #FFFFFF;
      --gray-text: #5A6072;
      --gray-border: #E8ECF1;
      --gray-inactive: #8C8C8C;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "SF Mono", monospace;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --radius-sm: 8px;
      --transition: all 0.2s ease;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--gray-bg);
      color: var(--dark-blue);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 0;
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
    }

    h1 {
      font-size: 42px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 12px;
    }

    h4 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    p {
      font-size: 16px;
      line-height: 1.7;
      color: var(--gray-text);
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      transition: var(--transition);
    }

    /* 导航栏 */
    .desktop-nav {
      background: var(--dark-blue);
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--primary-orange);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-orange);
      margin-right: 4px;
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 3px solid transparent;
    }

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

    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 8px 18px rgba(240,78,48,0.3);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-orange);
      color: var(--primary-orange);
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
    }

    .btn-outline:hover {
      background: var(--primary-orange);
      color: white;
    }

    .btn-text {
      color: var(--primary-orange);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-text:hover {
      text-decoration: underline;
      color: var(--primary-deep);
    }

    /* 移动端底部导航 */
    .mobile-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: white;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.06);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      border-top: 1px solid var(--gray-border);
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--gray-inactive);
      font-size: 11px;
      font-weight: 500;
      gap: 4px;
      transition: var(--transition);
    }

    .tab-item i {
      font-size: 22px;
      color: inherit;
    }

    .tab-item.active {
      color: var(--primary-orange);
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1A1D2E 0%, #2A2F45 100%);
      color: white;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-visual {
      flex: 1 1 45%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      opacity: 0.95;
      position: relative;
    }

    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(26,29,46,0.2);
      border-radius: 32px;
    }

    .hero-badge-group {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .badge-light {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(4px);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 14px;
      color: #ddd;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .highlight {
      color: var(--gold-amber);
      font-weight: 700;
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--gray-border);
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .data-badge {
      display: inline-block;
      background: var(--teal-green);
      color: white;
      border-radius: var(--radius-sm);
      padding: 4px 12px;
      font-family: var(--font-mono);
      font-weight: 600;
      font-size: 13px;
      margin-top: 12px;
    }

    .pain-list {
      list-style: none;
      font-size: 18px;
      color: var(--dark-blue);
    }

    .pain-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .dark-bg {
      background: var(--dark-blue);
      color: white;
      border-radius: 32px;
      padding: 64px 48px;
    }

    .big-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 700;
      color: var(--gold-amber);
    }

    .testimonial-card {
      background: white;
      border-radius: 24px;
      padding: 28px;
    }

    .stars {
      color: var(--gold-amber);
      letter-spacing: 2px;
    }

    .process-steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }

    .step-circle {
      background: var(--primary-orange);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }

    .faq-item {
      border-bottom: 1px solid var(--gray-border);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-text);
    }

    footer {
      background: var(--dark-blue);
      color: #ccc;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .desktop-nav .nav-links { display: none; }
      .mobile-tab-bar { display: flex; }
      body { padding-bottom: 56px; }
      .hero-grid { flex-direction: column; }
      .hero-visual { height: 240px; width: 100%; }
      h1 { font-size: 32px; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; gap: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .dark-bg { padding: 32px 24px; }
    }