/* roulang page: index */
:root {
      --primary: #7B1038;
      --secondary: #1B7FBD;
      --bg-deep: #0A0E17;
      --bg-card: rgba(20, 28, 45, 0.7);
      --bg-section: #111827;
      --text-white: #FFFFFF;
      --text-body: rgba(255, 255, 255, 0.8);
      --border-glass: rgba(255, 255, 255, 0.08);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.6);
      --radius-lg: 16px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .hero-title, .section-title {
      color: var(--text-white);
      font-weight: 600;
    }
    a {
      color: var(--secondary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: #fff;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 自定义容器微调 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航双行结构 */
    .navbar-brand-custom {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.6rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }
    .brand-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: #fff;
    }
    .top-bar {
      background-color: rgba(10, 14, 23, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-glass);
      padding: 8px 0;
    }
    .channel-nav {
      background-color: rgba(17, 24, 39, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-glass);
    }
    .channel-link {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: rgba(255,255,255,0.7);
      padding: 12px 20px;
      display: inline-block;
      font-weight: 500;
      position: relative;
      transition: var(--transition);
    }
    .channel-link:hover {
      color: #fff;
    }
    .channel-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 20px;
      right: 20px;
      height: 3px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      transform: scaleX(0);
      transition: transform 0.3s;
    }
    .channel-link:hover::after,
    .channel-link.active::after {
      transform: scaleX(1);
    }
    .navbar-toggler {
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 14px rgba(123,16,56,0.4);
    }
    .btn-primary-custom:hover {
      background: #9a1246;
      box-shadow: 0 0 24px rgba(123,16,56,0.7);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: rgba(27,127,189,0.1);
      color: #fff;
      border-color: #4aa3d9;
    }
    /* 英雄区域 */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(123,16,56,0.2) 0%, transparent 50%), 
                  linear-gradient(180deg, #0A0E17 0%, #111827 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-glass-art {
      position: relative;
      width: 100%;
      height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .glass-circle {
      position: absolute;
      border-radius: 50%;
      background: rgba(27,127,189,0.15);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.15);
    }
    .glass-circle-1 { width: 280px; height: 280px; top: 10%; right: 10%; background: radial-gradient(circle, rgba(123,16,56,0.5) 0%, transparent 70%); }
    .glass-circle-2 { width: 180px; height: 180px; bottom: 20%; left: 15%; background: rgba(27,127,189,0.3); }
    .glass-line {
      position: absolute;
      width: 200px;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--secondary), transparent);
      transform: rotate(25deg);
      top: 40%;
      right: 25%;
    }
    /* 卡片 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-card {
      border: 1px solid rgba(123,16,56,0.5);
      box-shadow: 0 0 30px rgba(123,16,56,0.2);
      transform: scale(1.02);
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 2px;
    }
    .data-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
    }
    /* FAQ手风琴定制 */
    .accordion-button {
      background-color: rgba(20,28,45,0.8);
      color: #fff;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(123,16,56,0.2);
      color: #fff;
    }
    .accordion-item {
      background: transparent;
      border: none;
    }
    /* 图片遮罩 */
    .img-mask {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .img-mask::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(123,16,56,0.7) 0%, rgba(10,14,23,0.85) 100%);
    }
    footer {
      background-color: #0A0E17;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    @media (max-width: 768px) {
      .hero-glass-art { height: 280px; }
      .section-title { font-size: 1.8rem; }
    }