/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-bg: rgba(30, 35, 54, 0.6);
      --electric-cyan: #00F0FF;
      --coral-orange: #FF6B6B;
      --deep-space: #1A1F3A;
      --fog-white: #E8ECF1;
      --pure-white: #FFFFFF;
      --border-glow: rgba(0, 240, 255, 0.15);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.5);
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      color: var(--fog-white);
      line-height: 1.8;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.3s ease;
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    /* 自定义容器 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 吸顶导航 */
    .header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
      transition: all 0.3s ease;
    }

    .header-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
      border-bottom: 1px solid var(--electric-cyan);
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 60px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--pure-white);
      letter-spacing: 0.02em;
    }

    .logo-img {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      filter: brightness(1.2);
      border: 1px solid var(--electric-cyan);
    }

    .channel-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .channel-links a {
      color: var(--fog-white);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
    }

    .channel-links a:hover {
      color: var(--electric-cyan);
    }

    .channel-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0%;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.3s ease;
      box-shadow: 0 0 10px var(--electric-cyan);
    }

    .channel-links a:hover::after {
      width: 100%;
    }

    .trend-tag {
      background: var(--coral-orange);
      color: white;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      margin-left: 0.8rem;
      animation: breathe 2s infinite;
    }

    @keyframes breathe {
      0% { opacity: 0.9; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.03); }
      100% { opacity: 0.9; transform: scale(1); }
    }

    .search-icon {
      display: flex;
      align-items: center;
      margin-left: 1rem;
      cursor: pointer;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--pure-white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
      transform: translateY(-5px);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-blue);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 0.8rem 2.2rem;
      border: none;
      box-shadow: var(--shadow-glow);
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--coral-orange);
      color: white;
      box-shadow: 0 0 30px rgba(255, 107, 107, 0.7);
      transform: scale(1.05);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
      transition: all 0.3s ease;
    }

    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 25px var(--electric-cyan);
      color: white;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .hero-left {
      flex: 1;
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--pure-white);
      line-height: 1.2;
      margin-bottom: 1.2rem;
      letter-spacing: 0.02em;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--fog-white);
      margin-bottom: 2rem;
    }

    .metrics-row {
      display: flex;
      gap: 2rem;
      margin: 2.5rem 0;
    }

    .metric-item {
      text-align: center;
    }

    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--electric-cyan);
      text-shadow: 0 0 15px rgba(0,240,255,0.5);
    }

    .hero-right {
      flex: 1;
      position: relative;
      height: 450px;
    }

    .card-stack {
      position: relative;
      width: 100%;
      height: 100%;
    }

    .stack-card {
      position: absolute;
      width: 260px;
      height: 320px;
      background: rgba(30, 35, 54, 0.7);
      backdrop-filter: blur(15px);
      border-radius: 20px;
      border: 1px solid var(--border-glow);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      box-shadow: 0 20px 30px rgba(0,0,0,0.5);
    }

    .stack-card:nth-child(1) {
      top: 20px;
      left: 30px;
      transform: rotate(-5deg);
    }
    .stack-card:nth-child(2) {
      top: 60px;
      left: 100px;
      transform: rotate(3deg);
      z-index: 2;
    }
    .stack-card:nth-child(3) {
      top: 90px;
      left: 170px;
      transform: rotate(-2deg);
      z-index: 1;
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--pure-white);
      margin-bottom: 2.5rem;
      text-align: center;
      letter-spacing: 0.02em;
    }

    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      overflow: hidden;
      transition: 0.3s;
    }

    .service-card:hover {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
    }

    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      filter: brightness(0.9) contrast(1.1);
    }

    .card-content {
      padding: 1.5rem;
    }

    /* 对比滑块 */
    .compare-wrapper {
      display: flex;
      align-items: stretch;
      background: rgba(10,14,39,0.8);
      border-radius: 24px;
      overflow: hidden;
    }

    .compare-side {
      flex: 1;
      padding: 2rem;
    }

    /* FAQ */
    .faq-item {
      background: rgba(30,35,54,0.5);
      backdrop-filter: blur(15px);
      border-radius: 12px;
      margin-bottom: 1rem;
      border: 1px solid transparent;
      transition: 0.2s;
    }

    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--pure-white);
    }

    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--fog-white);
      display: none;
    }

    .faq-item.active {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.2);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 粒子背景 */
    .particle-bg {
      position: relative;
      background: radial-gradient(circle at 20% 30%, #1a1f3a, #0a0e27);
      overflow: hidden;
    }

    .particle-bg::before {
      content: "";
      position: absolute;
      width: 200%;
      height: 200%;
      top: -50%;
      left: -50%;
      background-image: radial-gradient(white 1px, transparent 1px);
      background-size: 50px 50px;
      animation: moveParticles 20s linear infinite;
      opacity: 0.15;
    }

    @keyframes moveParticles {
      0% { transform: translate(0, 0); }
      100% { transform: translate(50px, 50px); }
    }

    .cta-input {
      background: rgba(10,14,39,0.7);
      border: 1px solid var(--electric-cyan);
      border-radius: var(--radius-input);
      padding: 0.8rem 1rem;
      color: white;
      width: 100%;
      margin-bottom: 1rem;
    }

    .cta-input:focus {
      border-color: var(--coral-orange);
      box-shadow: 0 0 15px var(--coral-orange);
    }

    /* 页脚 */
    .footer {
      background: #060812;
      padding: 2rem 0;
      text-align: center;
      color: #aaa;
    }

    @media (max-width: 1024px) {
      .hero-title { font-size: 2.8rem; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .channel-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .hero-right { height: 300px; }
      .service-grid { grid-template-columns: 1fr; }
      .metrics-row { flex-wrap: wrap; justify-content: center; }
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(30px);
      padding: 1rem;
    }
    .mobile-menu a {
      padding: 0.8rem;
      color: white;
      border-bottom: 1px solid #2a2f45;
    }