/* roulang page: index */
:root {
      --primary-deep: #0B1D3A;
      --accent-cyan: #00E5A0;
      --accent-orange: #FF6B3D;
      --bg-light: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1A2332;
      --text-secondary: #5E6E82;
      --text-weak: #8E9CAB;
      --dark-bg: #0A1628;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(11, 29, 58, 0.06);
      --shadow-hover: 0 8px 30px rgba(11, 29, 58, 0.10);
      --transition-smooth: 0.25s ease;
      --max-width: 1200px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--dark-bg);
      display: flex;
      align-items: center;
      z-index: 1000;
      box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 12px var(--accent-cyan);
    }

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

    .nav-link {
      font-size: 15px;
      color: var(--text-weak);
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      box-shadow: 0 0 10px var(--accent-cyan);
      transition: width 0.25s ease;
    }

    .nav-link:hover {
      color: #FFFFFF;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .nav-link.active {
      color: #FFFFFF;
      text-shadow: 0 0 8px rgba(0, 229, 160, 0.5);
    }

    .nav-link.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--accent-cyan);
      color: var(--primary-deep) !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: 0.25s ease;
      margin-left: 24px;
    }

    .nav-cta:hover {
      background: var(--accent-orange);
      color: white !important;
      transform: scale(1.03);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(11,29,58,0.75) 0%, rgba(10,22,40,0.85) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding-top: 72px;
      color: white;
    }

    .hero-content {
      max-width: 700px;
    }

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

    .hero-line {
      width: 80px;
      height: 2px;
      background: var(--accent-cyan);
      margin-bottom: 28px;
      box-shadow: 0 0 15px var(--accent-cyan);
      animation: breathe 2.5s infinite alternate;
    }

    @keyframes breathe {
      0% { opacity: 0.6; width: 70px; }
      100% { opacity: 1; width: 90px; }
    }

    .hero-sub {
      font-size: 16px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: 0.25s ease;
    }

    .btn-primary:hover {
      background: var(--accent-orange);
      color: white;
      transform: scale(1.03);
    }

    /* 通用板块 */
    section {
      padding: 120px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .title-underline {
      width: 40px;
      height: 4px;
      background: var(--accent-cyan);
      margin-bottom: 48px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: transparent;
      padding: 32px 24px;
      border-bottom: 1px solid #E2E8F0;
      transition: 0.3s;
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .pain-card:hover {
      border-bottom-color: var(--accent-cyan);
    }

    .pain-icon img {
      width: 48px;
      height: 48px;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .solution-card {
      display: flex;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: 0.3s;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .solution-text {
      flex: 1;
      padding: 40px;
    }

    .solution-img {
      width: 45%;
      object-fit: cover;
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
      transition: transform 0.3s;
    }

    .solution-card:hover .solution-img {
      transform: scale(1.03);
    }

    .text-link {
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: 0.2s;
    }

    .text-link:hover {
      color: var(--accent-orange);
      transform: translateX(4px);
    }

    /* 优势 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .adv-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.3s;
    }

    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .adv-icon {
      width: 64px;
      margin: 0 auto 16px;
    }

    .dot-accent {
      width: 8px;
      height: 8px;
      background: var(--accent-cyan);
      border-radius: 50%;
      margin: 12px auto;
    }

    /* 数据 */
    .results-banner {
      background: var(--primary-deep);
      padding: 80px 0;
      color: white;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--bg-light);
      padding: 40px;
      border-radius: var(--radius-card);
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }

    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
    }

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

    .faq-item {
      border-bottom: 1px solid #E2E8F0;
      padding: 24px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-main);
      transition: 0.2s;
    }

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

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

    /* CTA */
    .cta-dark {
      background: var(--dark-bg);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
    }

    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 16px;
    }

    .btn-outline:hover {
      background: white;
      color: var(--dark-bg);
    }

    /* 页脚 */
    .main-footer {
      background: var(--primary-deep);
      color: var(--text-weak);
      padding: 40px 0;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }

    .footer-line {
      height: 1px;
      background: var(--accent-cyan);
      width: 100%;
      margin: 20px 0 16px;
    }

    @media (max-width: 1024px) {
      .container, .header-inner {
        padding: 0 32px;
      }
      .pain-grid { grid-template-columns: repeat(2,1fr); }
      .adv-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .hero h1 { font-size: 32px; }
      section { padding: 60px 0; }
      .pain-grid, .adv-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .solution-card { flex-direction: column; }
      .solution-img { width: 100%; height: 200px; border-radius: 0; }
      .stats-grid { flex-direction: column; gap: 40px; }
    }