/* roulang page: index */
:root {
      --abyss-black: #0A0E17;
      --night-indigo: #1A1F2B;
      --neon-red: #FF2A4B;
      --titanium-gray: #8A94A6;
      --cold-white: #F2F4F8;
      --deep-footer: #05080D;
      --font-display: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --radius-card: 8px;
      --radius-btn: 4px;
      --shadow-red: 0 0 20px rgba(255, 42, 75, 0.3);
      --transition-smooth: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: var(--abyss-black);
      font-family: var(--font-body);
      color: var(--cold-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, .data-number {
      font-family: var(--font-display);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.15;
    }
    h2 {
      font-size: clamp(2.2rem, 5vw, 3rem);
      margin-bottom: 1.5rem;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      transition: var(--transition-smooth);
      border: none;
      background: transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(138, 148, 166, 0.15);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--cold-white);
      letter-spacing: -1px;
    }
    .logo span {
      color: var(--neon-red);
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--titanium-gray);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cold-white);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-red);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--cold-white);
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--abyss-black);
      flex-direction: column;
      padding: 2rem;
      gap: 1.8rem;
      border-bottom: 1px solid rgba(138,148,166,0.2);
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--titanium-gray);
      font-size: 1.2rem;
      font-weight: 500;
    }
    /* 各板块通用 */
    section {
      padding: 120px 0;
      scroll-margin-top: 80px;
    }
    .section-label {
      display: inline-block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--neon-red);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.8rem;
    }
    /* Hero */
    #hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
      padding-top: 100px;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,14,23,0.85) 40%, rgba(10,14,23,0.4) 100%);
    }
    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      font-size: clamp(3rem, 7vw, 4rem);
      color: var(--cold-white);
      margin-bottom: 1.5rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--titanium-gray);
      max-width: 500px;
      margin-bottom: 2rem;
    }
    .btn-primary {
      background: var(--neon-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(255,42,75,0.4);
    }
    .btn-primary:hover {
      background: #ff4d6a;
      box-shadow: 0 0 25px rgba(255,42,75,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid var(--neon-red);
      color: var(--neon-red);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--neon-red);
      color: white;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: var(--neon-red);
      font-size: 1.5rem;
    }
    @keyframes bounce {
      0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0);}
      40%{transform:translateX(-50%) translateY(-10px);}
      60%{transform:translateX(-50%) translateY(-5px);}
    }
    /* 解决方案不对称网格 */
    .solution-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .card {
      background: rgba(26, 31, 43, 0.8);
      border: 1px solid var(--titanium-gray);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: var(--transition-smooth);
    }
    .card:hover {
      border-color: var(--neon-red);
      box-shadow: var(--shadow-red);
    }
    .main-card {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .card i {
      color: var(--neon-red);
      font-size: 2rem;
      margin-bottom: 1.2rem;
    }
    .card h3 {
      font-size: 1.6rem;
      margin-bottom: 1rem;
    }
    /* 数据滚动 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-item .data-number {
      font-size: 3.5rem;
      color: var(--neon-red);
      font-weight: 800;
    }
    /* 证言卡片 */
    .testimonial-card {
      background: rgba(26,31,43,0.9);
      border: 1px solid var(--titanium-gray);
      border-radius: var(--radius-card);
      padding: 3rem;
      text-align: center;
    }
    .testimonial-card i {
      font-size: 2.5rem;
      color: var(--neon-red);
      opacity: 0.7;
    }
    .testimonial-text {
      font-style: italic;
      font-size: 1.25rem;
      margin: 2rem 0;
    }
    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(138,148,166,0.25);
      padding: 1.8rem 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.15rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--titanium-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }
    /* CTA表单 */
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 2rem auto 0;
    }
    .cta-form input {
      flex:1;
      background: var(--night-indigo);
      border: none;
      border-bottom: 2px solid var(--titanium-gray);
      padding: 14px 18px;
      color: white;
      font-size: 1rem;
      border-radius: 4px 0 0 4px;
    }
    .cta-form input:focus {
      outline: none;
      border-bottom-color: var(--neon-red);
    }
    .cta-form button {
      background: var(--neon-red);
      color: white;
      padding: 0 28px;
      border-radius: 0 4px 4px 0;
      font-weight: 600;
    }
    /* Footer */
    .footer {
      background: var(--deep-footer);
      padding: 3rem 0;
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .social i {
      font-size: 1.4rem;
      margin-left: 1.5rem;
      color: var(--titanium-gray);
      transition: color 0.2s;
    }
    .social i:hover { color: var(--neon-red); }
    /* 响应式 */
    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .hero-content { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .cta-form { flex-direction: column; }
      .cta-form input, .cta-form button { border-radius: 4px; width: 100%; }
    }