/* roulang page: index */
:root {
      --deep-teal: #0B1A1A;
      --dark-teal: #0D1F1F;
      --electric-cyan: #00E5CC;
      --electric-cyan-hover: #33FFDD;
      --warm-gold: #D4A853;
      --gray-bg: #F5F7FA;
      --card-bg: #FFFFFF;
      --light-border: #E8ECF0;
      --text-dark: #1A2626;
      --text-body: #2C3A3A;
      --text-muted: #5A6A6A;
      --text-light: #8A9A9A;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "DM Sans", "Inter", sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: #FFFFFF;
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 图片通用 */
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, background 0.25s ease, border-color 0.25s ease;
    }
    
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 26, 26, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 229, 204, 0.15);
      transition: background 0.3s ease;
      height: var(--nav-height);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--electric-cyan);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
    }
    
    .logo-icon {
      font-size: 2rem;
      color: var(--electric-cyan);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      color: #B0C0C0;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-cyan);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    
    .hot-tags {
      display: flex;
      gap: 10px;
    }
    
    .tag-pill {
      background: rgba(0, 229, 204, 0.08);
      color: var(--electric-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 500;
    }
    
    .search-icon {
      color: #B0C0C0;
      font-size: 1.1rem;
      cursor: pointer;
      transition: color 0.2s;
    }
    .search-icon:hover { color: var(--electric-cyan); }
    
    .cta-nav {
      color: var(--electric-cyan);
      font-weight: 600;
      border-bottom: 1px solid var(--electric-cyan);
      padding-bottom: 2px;
      font-size: 0.9rem;
      margin-left: 8px;
      transition: 0.25s;
    }
    .cta-nav:hover { border-bottom-width: 2px; }
    
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #B0C0C0;
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(11, 26, 26, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 999;
      border-bottom: 1px solid rgba(0,229,204,0.2);
    }
    .mobile-nav a {
      color: #E0E8E8;
      font-size: 1.2rem;
      font-weight: 500;
      display: block;
    }
    
    /* Hero */
    .hero {
      background: radial-gradient(circle at 30% 30%, #0D2A2A, var(--deep-teal));
      position: relative;
      padding: 160px 0 100px;
      overflow: hidden;
      color: white;
    }
    
    .hero-bg-effect {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      mix-blend-mode: overlay;
    }
    
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    
    .hero-content {
      flex: 1 1 500px;
    }
    
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
      letter-spacing: 0.5px;
    }
    .hero h1 span {
      color: var(--electric-cyan);
    }
    
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
      max-width: 540px;
    }
    
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }
    
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-teal);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      cursor: pointer;
      transition: 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--electric-cyan-hover);
      box-shadow: 0 0 16px rgba(0,229,204,0.5);
    }
    
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }
    
    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 320px;
      filter: drop-shadow(0 20px 24px rgba(0,0,0,0.5));
    }
    
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 48px;
    }
    
    /* 痛点区 */
    .pain-points {
      background: #F5F7FA;
    }
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border-left: 6px solid #C05A4A;
      box-shadow: var(--shadow-card);
    }
    
    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid rgba(0,0,0,0.04);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--electric-cyan);
    }
    .solution-icon {
      font-size: 2.5rem;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }
    
    /* 数据区 */
    .stats-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 60px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--electric-cyan);
    }
    
    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 8px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      min-width: 300px;
      box-shadow: var(--shadow-card);
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #E0E6EA;
    }
    .faq-question {
      font-weight: 600;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--deep-teal);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    
    /* CTA 区 */
    .cta-section {
      background: var(--deep-teal);
      text-align: center;
      color: white;
    }
    
    /* 页脚 */
    .footer {
      background: #0B1A1A;
      color: #8A9A9A;
      padding: 60px 0 24px;
    }
    
    @media (max-width: 1024px) {
      .hero h1 { font-size: 40px; }
      .nav-links, .hot-tags { display: none; }
      .mobile-menu-toggle { display: block; }
    }
    
    @media (max-width: 640px) {
      .hero h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .container { padding: 0 16px; }
    }