/* roulang page: index */
:root {
      --primary-deep-purple: #4B0082;
      --primary-crimson: #DC143C;
      --accent-cyan: #00FF7F;
      --accent-cyan-light: #33FF99;
      --bg-black: #0D0D0D;
      --bg-dark-charcoal: #1A1A1A;
      --bg-card: #1E1E1E;
      --bg-card-light: #252525;
      --text-body: #E0E0E0;
      --text-white: #FFFFFF;
      --text-muted: #B0B0B0;
      --titanium-gray: #C0C0C0;
      --border-subtle: rgba(192,192,192,0.1);
      --border-crimson-glow: rgba(220,20,60,0.5);
      --shadow-crimson: rgba(220,20,60,0.3);
      --shadow-cyan: rgba(0,255,127,0.6);
      --radius-card: 8px;
      --radius-btn: 4px;
      --radius-round: 50%;
      --transition-smooth: 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-black);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }

    button, .button {
      cursor: pointer;
      font-family: inherit;
    }

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

    /* 顶部导航 - 桌面固定 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(13,13,13,0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--primary-crimson);
      box-shadow: 0 2px 15px rgba(220,20,60,0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 900;
      background: linear-gradient(135deg, var(--accent-cyan) 0%, #00cc6a 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .nav-desktop {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-desktop a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-desktop a:hover,
    .nav-desktop a.active {
      color: var(--accent-cyan);
    }

    .nav-desktop a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }

    .nav-desktop a:hover::after,
    .nav-desktop a.active::after {
      width: 100%;
    }

    /* 移动端底部Tab */
    .mobile-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #0D0D0D;
      border-top: 1px solid var(--primary-crimson);
      box-shadow: 0 -2px 20px rgba(220,20,60,0.25);
      z-index: 100;
      padding: 0.5rem 0;
      justify-content: space-around;
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--accent-cyan);
      font-size: 0.7rem;
      transition: 0.2s;
      padding: 0.25rem;
    }

    .tab-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }

    .tab-item.active {
      color: var(--primary-crimson);
    }

    /* Hero区域 */
    .hero-section {
      height: 100vh;
      min-height: 700px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(13,13,13,0.7);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(75,0,130,0.5) 0%, transparent 70%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      padding: 0 1.5rem;
    }

    .hero-title {
      font-size: clamp(2.5rem, 8vw, 5rem);
      font-weight: 900;
      letter-spacing: -0.02em;
      line-height: 1.1;
      background: linear-gradient(to right, #4B0082, #DC143C);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #B0B0B0;
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: #0D0D0D;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 1rem 2.5rem;
      border: none;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--accent-cyan-light);
      box-shadow: 0 0 20px var(--shadow-cyan);
      transform: translateY(-2px);
      color: #0D0D0D;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 0.9rem 2.4rem;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      background: var(--accent-cyan);
      color: #0D0D0D;
    }

    .floating-stat {
      position: absolute;
      right: 8%;
      bottom: 15%;
      background: rgba(30,30,30,0.8);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(192,192,192,0.15);
      border-radius: 12px;
      padding: 1rem 1.8rem;
      text-align: left;
      z-index: 3;
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--accent-cyan);
      transform: skewX(-5deg);
    }

    /* 通用板块 */
    .section {
      padding: 6rem 0;
    }

    .section-dark {
      background-color: #0D0D0D;
    }

    .section-charcoal {
      background-color: #1A1A1A;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 2.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .title-accent {
      width: 4px;
      height: 40px;
      background: var(--accent-cyan);
      display: inline-block;
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }

    .feature-card {
      background: linear-gradient(145deg, #1E1E1E, #252525);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: all 0.25s;
    }

    .feature-card:hover {
      border-color: var(--primary-crimson);
      box-shadow: 0 0 30px var(--shadow-crimson);
      transform: translateY(-3px);
    }

    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }

    .card-title {
      font-size: 1.4rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 0.8rem;
    }

    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 1.5rem;
      text-align: center;
    }

    .trust-number {
      font-size: 3rem;
      font-weight: 900;
      color: var(--accent-cyan);
      transform: skewX(-5deg);
    }

    .scene-grid {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 2rem;
      perspective: 800px;
    }

    .scene-card {
      background: #1E1E1E;
      border-radius: var(--radius-card);
      padding: 1.2rem;
      transform: rotateY(2deg) skewY(-0.5deg);
      transition: 0.3s;
      width: 280px;
      border: 1px solid rgba(192,192,192,0.1);
    }

    .scene-card:hover {
      transform: rotateY(0) skewY(0) translateY(-5px);
      border-color: var(--primary-crimson);
    }

    .honor-wall {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
    }

    .honor-item {
      min-width: 260px;
      background: #1E1E1E;
      border-radius: 8px;
      padding: 1.5rem;
      border-left: 4px solid var(--accent-cyan);
    }

    .accordion-title {
      font-size: 1.2rem;
      background: #1E1E1E;
      border: none;
      color: var(--accent-cyan);
    }

    .cta-banner {
      background: linear-gradient(135deg, #DC143C, #4B0082);
      text-align: center;
      padding: 5rem 1.5rem;
      position: relative;
    }

    .footer-links a {
      color: #B0B0B0;
      margin-right: 1rem;
    }

    @media (max-width: 1024px) {
      .trust-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 640px) {
      .nav-desktop { display: none; }
      .mobile-tab-bar { display: flex; }
      .hero-title { font-size: 2.5rem; }
      .trust-grid { grid-template-columns: 1fr 1fr; }
      .card-grid { grid-template-columns: 1fr; }
      .floating-stat { right: 5%; bottom: 10%; }
      .btn-group { flex-direction: column; align-items: center; }
    }