/* roulang page: index */
:root {
      --primary-purple: #8A2BE2;
      --primary-deep: #6A1B9A;
      --cyan: #00E5FF;
      --orange: #FF6B35;
      --dark-bg: #0F0F1A;
      --darker-bg: #0A0A14;
      --card-bg: rgba(255, 255, 255, 0.04);
      --white: #FFFFFF;
      --gray-light: #E0E0E0;
      --gray-mid: #9E9E9E;
      --text-main: #F5F5F5;
      --text-secondary: #B0B0C0;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --shadow-card: 0 18px 40px -12px rgba(0,0,0,0.5);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --font-xl: clamp(2.4rem, 6vw, 3.8rem);
      --font-h2: clamp(2rem, 4vw, 2.8rem);
      --font-h3: clamp(1.3rem, 2.5vw, 1.8rem);
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--dark-bg);
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background: var(--dark-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 28px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      backdrop-filter: blur(12px);
      background: rgba(10, 10, 20, 0.75);
      border-bottom: 1px solid rgba(138, 43, 226, 0.3);
      transition: var(--transition);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #C084FC, #00E5FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 10px #8A2BE2);
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      color: var(--gray-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--white);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #4B0082, #0A0A14);
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.32;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: var(--font-xl);
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #E9D5FF, #A5F3FC);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: #D1D5DB;
      margin-bottom: 40px;
      max-width: 600px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #8A2BE2, #00E5FF);
      border: none;
      padding: 16px 42px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1.1rem;
      color: white;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 10px 25px rgba(138, 43, 226, 0.5);
      transition: all 0.3s;
      letter-spacing: 0.8px;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 20px 35px rgba(0, 229, 255, 0.4);
      transform: translateY(-3px);
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: var(--font-h2);
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--white);
    }
    .section-desc {
      color: #B0B0C0;
      font-size: 1.15rem;
      margin-bottom: 60px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-8px);
      border-color: rgba(138, 43, 226, 0.5);
      box-shadow: 0 25px 40px -15px #8A2BE2;
    }
    .card-icon {
      font-size: 2.6rem;
      margin-bottom: 20px;
    }
    /* 数据徽章 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 45px;
      margin-top: 35px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, #C084FC, #00E5FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      margin-bottom: 18px;
      padding: 20px 24px;
      border-left: 4px solid #8A2BE2;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
    }
    .faq-answer {
      margin-top: 14px;
      color: #C0C0D0;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #3B0764, #0E0E2C);
      border-radius: 48px;
      text-align: center;
      padding: 70px 30px;
      position: relative;
      overflow: hidden;
    }
    .cta-block::before {
      content: '';
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-2.webp') center/cover;
      opacity: 0.15;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      background: rgba(255,255,255,0.07);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 40px;
      padding: 14px 24px;
      color: white;
      margin-bottom: 16px;
      outline: none;
    }
    .form-group input:focus {
      border-color: #00E5FF;
      box-shadow: 0 0 12px #00E5FF;
    }
    footer {
      text-align: center;
      padding: 40px 0;
      color: #7F8C8D;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.4rem; }
    }