/* roulang page: index */
:root {
      --deep-blue: #0A0E1A;
      --midnight-bg: #0B101E;
      --accent-cyan: #00D4FF;
      --warm-amber: #FF8C42;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --glass-hover-bg: rgba(255,255,255,0.08);
      --text-primary: #E8EDF5;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7D99;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 30px rgba(0,212,255,0.15);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background: radial-gradient(circle at 30% 10%, #111B2F, #0A0E1A 80%);
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", "Inter", system-ui, sans-serif;
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    /* 网格装饰 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }
    /* 导航栏 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10,14,26,0.7);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: background 0.3s ease;
    }
    .nav-bar.scrolled {
      background: rgba(10,14,26,0.92);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.9rem 2rem;
      max-width: 1300px;
      margin: 0 auto;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.4rem;
      color: #fff;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a.active {
      color: var(--accent-cyan);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .btn-outline {
      border: 1px solid rgba(0,212,255,0.4);
      background: transparent;
      color: var(--accent-cyan);
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,212,255,0.08);
      border-color: var(--accent-cyan);
      color: #fff;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: #0A0E1A;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #33DDFF;
      box-shadow: 0 0 25px rgba(0,212,255,0.5);
      transform: scale(1.03);
      color: #000;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--accent-cyan);
      transition: 0.3s;
    }
    /* 移动端导航 */
    @media (max-width: 840px) {
      .nav-links, .nav-actions {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,14,26,0.96);
        backdrop-filter: blur(25px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.8rem;
        display: none;
        z-index: 999;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: var(--text-secondary);
        font-size: 1.2rem;
        border-bottom: 1px solid rgba(255,255,255,0.05);
        padding-bottom: 0.5rem;
      }
    }
    /* Hero */
    .hero {
      padding: 8rem 0 5rem;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .hero-text {
      flex: 1;
    }
    .badge {
      color: var(--warm-amber);
      font-weight: 600;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      margin-bottom: 1.2rem;
    }
    .badge::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--warm-amber);
      border-radius: 50%;
    }
    h1 {
      font-size: 3.7rem;
      font-weight: 800;
      color: #fff;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #8FA4BE;
      max-width: 500px;
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 2rem;
      backdrop-filter: blur(8px);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 320px;
      box-shadow: 0 0 40px rgba(0,212,255,0.1);
    }
    /* 通用区块 */
    section {
      padding: 5rem 0;
      position: relative;
      z-index: 2;
    }
    h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 0.5rem;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 2.8rem;
    }
    .divider {
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--accent-cyan), transparent);
      margin: 0.8rem 0 2rem;
    }
    .glass-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 2rem;
      backdrop-filter: blur(12px);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      background: var(--glass-hover-bg);
      border-color: rgba(0,212,255,0.3);
      box-shadow: var(--shadow-glow);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 2.5rem;
    }
    .advantage-icon {
      font-size: 2.3rem;
      color: var(--accent-cyan);
      margin-bottom: 1.2rem;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 0.7rem;
    }
    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3rem;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.1);
      background: #0f1422;
    }
    .solution-img img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
    }
    .solution-img:hover img {
      transform: scale(1.02);
    }
    /* 数据统计 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--accent-cyan);
      font-family: "Inter", sans-serif;
    }
    /* 证言 */
    .testimonial-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .avatar {
      width: 56px;
      height: 56px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #0A0E1A;
      font-size: 1.4rem;
      margin-bottom: 1rem;
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 1.2rem 0;
    }
    .accordion-question {
      font-weight: 600;
      color: #fff;
      font-size: 1.15rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-answer {
      color: var(--text-secondary);
      margin-top: 0.8rem;
      display: none;
      padding-left: 0.5rem;
      border-left: 3px solid var(--accent-cyan);
    }
    .accordion-item.active .accordion-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: #060B14;
      text-align: center;
      padding: 5rem 2rem;
    }
    .btn-large {
      padding: 1rem 3rem;
      font-size: 1.2rem;
      animation: pulse-glow 2.5s infinite;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 10px rgba(0,212,255,0.4); }
      50% { box-shadow: 0 0 30px rgba(0,212,255,0.7); }
      100% { box-shadow: 0 0 10px rgba(0,212,255,0.4); }
    }
    footer {
      background: #060B14;
      padding: 4rem 0 2rem;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero-content { flex-direction: column; }
      h1 { font-size: 2.8rem; }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
      .nav-container { padding: 0.8rem 1.5rem; }
      h1 { font-size: 2.3rem; }
      .solution-row { flex-direction: column; }
      .stats-grid { flex-direction: column; align-items: center; }
    }