/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --nebula-purple: #7B2FFF;
      --cyan-neon: #00F0FF;
      --dark-void: #1A1040;
      --text-primary: #FFFFFF;
      --text-secondary: #A0A0B8;
      --text-muted: #6B6B80;
      --border-glow: rgba(123, 47, 255, 0.25);
      --card-bg: rgba(255, 255, 255, 0.03);
      --glass-bg: rgba(10, 14, 39, 0.85);
      --radius-lg: 16px;
      --radius-md: 8px;
      --shadow-glow: 0 0 30px rgba(123, 47, 255, 0.4);
      --font-display: 'Orbitron', 'Black', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    body {
      font-family: var(--font-body);
      background: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 - 玻璃态固定 */
    .nav-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(123, 47, 255, 0.15);
      z-index: 100;
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 1.7rem;
      letter-spacing: 2px;
      color: white;
      text-decoration: none;
      background: linear-gradient(135deg, #FFFFFF 0%, #7B2FFF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 8px #7B2FFF);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: #CCCCCC;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--cyan-neon);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--nebula-purple);
      border-radius: 2px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(5, 8, 22, 0.98);
      backdrop-filter: blur(25px);
      display: none;
      flex-direction: column;
      padding: 40px 24px;
      gap: 28px;
      z-index: 99;
    }

    .mobile-menu a {
      font-size: 2rem;
      font-weight: 600;
      color: #DDD;
      text-decoration: none;
      border-bottom: 1px solid rgba(123,47,255,0.2);
      padding-bottom: 12px;
    }

    /* Hero 全屏 */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at 20% 30%, #1A1040 0%, #0A0E27 80%);
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      z-index: 0;
    }

    .starfield {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(2px 2px at 20px 30px, #eee, transparent),
                  radial-gradient(2px 2px at 40px 70px, #fff, transparent),
                  radial-gradient(1px 1px at 90px 40px, #ddd, transparent),
                  radial-gradient(1px 1px at 130px 80px, #fff, transparent);
      background-repeat: repeat;
      background-size: 200px 200px;
      animation: drift 40s linear infinite;
      opacity: 0.4;
    }

    @keyframes drift {
      from { transform: translateY(0); }
      to { transform: translateY(-200px); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 24px;
    }

    .hero h1 {
      font-family: var(--font-display);
      font-size: clamp(2.8rem, 7vw, 5rem);
      font-weight: 900;
      letter-spacing: 3px;
      text-shadow: 0 0 25px rgba(123,47,255,0.7);
      margin-bottom: 20px;
      background: linear-gradient(to right, #fff, #c084fc);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 1.3rem;
      color: #cbd5e1;
      margin-bottom: 40px;
      font-weight: 400;
      letter-spacing: 1px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary, .btn-secondary {
      padding: 14px 38px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
      letter-spacing: 0.8px;
      display: inline-block;
    }

    .btn-primary {
      background: var(--nebula-purple);
      color: white;
      border: none;
      box-shadow: 0 4px 20px rgba(123,47,255,0.5);
    }

    .btn-primary:hover {
      background: #9b4fff;
      transform: translateY(-2px);
      box-shadow: 0 0 35px #7B2FFF;
    }

    .btn-secondary {
      border: 2px solid var(--cyan-neon);
      color: var(--cyan-neon);
      background: transparent;
    }

    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
      transform: translateY(-2px);
      box-shadow: 0 0 25px #00F0FF;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: 2.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      letter-spacing: 1px;
    }

    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 60px;
    }

    /* 关于我们 */
    #about {
      background: linear-gradient(180deg, #0A0E27 0%, #120A2E 100%);
    }
    .about-grid {
      display: flex;
      gap: 60px;
      align-items: center;
      flex-wrap: wrap;
    }
    .about-text {
      flex: 1 1 400px;
    }
    .about-text h2 {
      font-size: 2.3rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .about-stats {
      flex: 1 1 300px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 28px 16px;
      text-align: center;
      backdrop-filter: blur(10px);
    }
    .stat-number {
      font-family: var(--font-display);
      font-size: 2.8rem;
      color: var(--cyan-neon);
      font-weight: 700;
    }

    /* 核心服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(123,47,255,0.2);
      border-radius: var(--radius-lg);
      padding: 40px 24px;
      text-align: center;
      transition: all 0.4s;
      backdrop-filter: blur(8px);
    }
    .service-card:hover {
      border-color: var(--cyan-neon);
      transform: translateY(-6px);
      box-shadow: 0 0 35px rgba(123,47,255,0.5);
    }
    .service-icon {
      font-size: 3rem;
      margin-bottom: 20px;
    }

    /* 优势数据带 */
    #advantages {
      background: linear-gradient(90deg, #0A0E27 0%, #1c1040 100%);
    }
    .adv-band {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
    }
    .adv-item {
      text-align: center;
    }
    .adv-number {
      font-family: var(--font-display);
      font-size: 3.2rem;
      color: #00F0FF;
      border-bottom: 2px solid #7B2FFF;
      display: inline-block;
      padding-bottom: 6px;
    }

    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #0f0f1f;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid #2a2a4a;
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, #0A0E27, transparent);
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: 12px;
      padding: 20px;
      border-left: 3px solid #7B2FFF;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    #cta {
      background: #0A0E27;
    }
    .cta-block {
      font-size: 2rem;
      font-style: italic;
      font-weight: 600;
      text-align: center;
      margin-bottom: 30px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      padding: 50px 0;
      background: #050814;
    }
    .footer-col h4 {
      color: #7B2FFF;
      margin-bottom: 16px;
    }

    @media (max-width: 1024px) {
      .services-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .services-grid, .cases-grid, .faq-grid { grid-template-columns: 1fr; }
      .about-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }