/* roulang page: index */
:root {
      --deep-ocean: #0B1A2F;
      --card-bg: #112240;
      --input-bg: #1A2D4A;
      --text-primary: #E8EDF5;
      --text-secondary: #8E9CB2;
      --text-muted: #B0BEC5;
      --neon-cyan: #00F0FF;
      --energy-orange: #FF6B35;
      --border-glow: rgba(0, 240, 255, 0.15);
      --border-hover-glow: rgba(0, 240, 255, 0.5);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.08);
      --shadow-hover-glow: 0 0 30px rgba(0, 240, 255, 0.2);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--deep-ocean);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 链接与基础 */
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    /* 按钮系统 */
    .btn-primary {
      display: inline-block;
      background: linear-gradient(135deg, var(--energy-orange), var(--neon-cyan));
      color: white;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(255, 107, 53, 0.6);
      transform: scale(1.03);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
      color: var(--neon-cyan);
    }

    .text-link {
      color: var(--neon-cyan);
      font-weight: 500;
      position: relative;
    }
    .text-link:hover {
      text-decoration: underline wavy var(--neon-cyan);
      text-underline-offset: 4px;
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 26, 47, 0.95);
      backdrop-filter: blur(10px);
      height: 70px;
      z-index: 100;
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--neon-cyan);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
    }

    .nav-cta {
      background: var(--energy-orange);
      color: white;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 1rem;
    }
    .nav-cta:hover {
      box-shadow: 0 0 15px rgba(255,107,53,0.6);
      color: white;
    }

    /* 移动端导航汉堡 */
    #menu-toggle {
      display: none;
    }
    .menu-icon {
      display: none;
      font-size: 1.8rem;
      color: var(--neon-cyan);
      cursor: pointer;
    }

    /* 区块通用 */
    section {
      padding: 6rem 0;
    }

    h2 {
      font-size: 2rem;
      line-height: 2.8rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      color: var(--text-primary);
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 4px;
      background: var(--neon-cyan);
      box-shadow: 0 0 10px var(--neon-cyan);
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      position: relative;
    }
    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(11, 26, 47, 0.75);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 2.8rem;
      line-height: 3.6rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--neon-cyan), var(--energy-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-muted);
      margin-bottom: 1rem;
    }
    .hero-desc {
      color: var(--text-secondary);
      max-width: 500px;
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    /* 卡片样式 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: var(--transition);
      box-shadow: var(--shadow-glow);
    }
    .card:hover {
      border-color: var(--border-hover-glow);
      box-shadow: var(--shadow-hover-glow);
    }
    .card-icon {
      font-size: 2rem;
      color: var(--neon-cyan);
      margin-bottom: 1rem;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.2);
    }
    .solution-text {
      flex: 1;
    }

    /* 数据区 */
    .metrics-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .metric-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 3.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--neon-cyan), white);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 证言轮播 */
    .testimonial-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 1rem;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--card-bg);
      border-left: 4px solid var(--neon-cyan);
      padding: 2rem;
      border-radius: var(--radius-card);
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      margin-bottom: 0.8rem;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid rgba(0,240,255,0.5);
    }
    .faq-answer {
      padding: 0 1.2rem 1.2rem;
      color: var(--text-muted);
      display: none;
      background: #0F1E36;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0,240,255,0.2);
    }

    /* 页脚 */
    #footer {
      border-top: 1px solid rgba(0,240,255,0.15);
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 992px) {
      .card-grid { grid-template-columns: repeat(2,1fr); }
      .solution-row { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-icon { display: block; }
      #menu-toggle:checked ~ .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(11,26,47,0.98);
        padding: 1rem;
      }
      .card-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 3rem 0; }
    }

@keyframes pulse-glow {
      0%, 100% { box-shadow: 0 0 15px rgba(255,107,53,0.4); }
      50% { box-shadow: 0 0 30px rgba(255,107,53,0.8); }
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--neon-cyan) !important;
      box-shadow: 0 0 8px rgba(0,240,255,0.4);
    }