/* roulang page: index */
:root {
      --primary: #0F172A;
      --secondary: #1E3A5F;
      --accent: #E2B04A;
      --accent-hover: #C9973A;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-light: #64748B;
      --border: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 20px rgba(0,0,0,0.08);
      --radius: 12px;
      --radius-btn: 8px;
      --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
      --font-number: "Inter", "SF Pro Text", system-ui, sans-serif;
      --transition: 0.25s ease;
      --hero-gradient: linear-gradient(135deg, #0F172A 0%, #1E3A5F 100%);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-main);
      background-color: var(--bg);
      color: var(--text);
      margin: 0;
      padding: 0;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-main);
      font-weight: 700;
      color: var(--primary);
      margin-top: 0;
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: 42px;
      line-height: 1.2;
      font-weight: 700;
    }

    h2 {
      font-size: 32px;
      line-height: 1.25;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }

    h3 {
      font-size: 22px;
      line-height: 1.35;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    p {
      font-size: 17px;
      line-height: 1.75;
      margin-bottom: 1.2rem;
      color: var(--text);
    }

    .text-small {
      font-size: 14px;
      line-height: 1.5;
      color: var(--text-light);
    }

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

    a:hover {
      color: var(--primary);
      text-decoration: none;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      z-index: 40;
      padding: 16px 0;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .brand {
      font-family: var(--font-main);
      font-size: 22px;
      font-weight: 700;
      letter-spacing: -0.2px;
      color: var(--primary);
      white-space: nowrap;
    }

    .brand span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      letter-spacing: 0.5px;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      border-radius: 1px;
    }

    .hamburger {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
      padding: 8px;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(16px);
      z-index: 50;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
    }

    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .mobile-menu .close-menu {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 30px;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      margin-top: 80px;
      background-image: url('/assets/images/backpic/back-1.webp'), var(--hero-gradient);
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: var(--primary);
      padding: 100px 0 100px;
      color: white;
      position: relative;
    }

    .hero-overlay {
      background: rgba(15, 23, 42, 0.6);
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

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

    .hero-content h1 {
      color: white;
      font-size: 42px;
      margin-bottom: 1.2rem;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      max-width: 550px;
      margin-bottom: 2.5rem;
    }

    .hero-image {
      flex: 1 1 35%;
      display: flex;
      justify-content: center;
    }

    .hero-image img {
      max-height: 320px;
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.2);
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 17px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }

    .btn-accent:hover {
      background: var(--accent-hover);
      color: white;
      box-shadow: 0 0 0 3px rgba(226,176,74,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 13px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }

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

    /* 区块 */
    section {
      padding: 100px 0;
    }

    .section-header {
      margin-bottom: 48px;
    }

    .bg-light {
      background-color: #F1F5F9;
    }

    .bg-dark {
      background-color: var(--primary);
      color: white;
    }

    /* 痛点区 */
    .pain-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }

    .pain-left, .pain-right {
      flex: 1 1 45%;
    }

    .pain-item {
      display: flex;
      gap: 20px;
      margin-bottom: 32px;
    }

    .pain-number {
      font-family: var(--font-number);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1;
      min-width: 48px;
    }

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

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

    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .solution-card-content {
      padding: 24px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }

    .stat-item {
      flex: 1 1 200px;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }

    /* 证言 */
    .testimonial-card {
      background: #F8FAFC;
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }

    .avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: #CBD5E1;
      flex-shrink: 0;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
    }

    .accordion-question {
      font-size: 18px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary);
    }

    .accordion-answer {
      font-size: 16px;
      color: var(--text);
      padding-top: 12px;
      display: none;
    }

    .accordion-item.active .accordion-answer {
      display: block;
    }

    /* CTA */
    .cta-block {
      background: var(--primary);
      text-align: center;
      padding: 90px 0;
    }

    .cta-block h2 {
      color: white;
    }

    .footer {
      background: #0B1622;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
    }

    .footer a {
      color: #94A3B8;
    }

    .footer a:hover {
      color: white;
    }

    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero .container { flex-direction: column; }
      .hero-content { text-align: center; }
      .pain-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 70px 0; }
    }

    @media (max-width: 640px) {
      h1 { font-size: 30px; }
      h2 { font-size: 24px; }
    }