/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --secondary-bg: #0D1117;
      --surface: #161B22;
      --surface-light: #1C2333;
      --accent-red: #FF3D00;
      --text-primary: #E6EDF3;
      --text-secondary: #8B949E;
      --border-glow: rgba(0, 230, 118, 0.18);
      --border-subtle: rgba(255, 255, 255, 0.06);
      --glass-bg: rgba(22, 27, 34, 0.75);
      --card-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
      --card-hover-shadow: 0 20px 48px rgba(0, 230, 118, 0.18);
      --radius-card: 14px;
      --radius-btn: 10px;
      --radius-input: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --nav-width: 76px;
      --header-height-mobile: 60px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--secondary-bg);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      display: flex;
      min-height: 100vh;
    }

    /* 左侧竖向导航 - 桌面 */
    .side-nav {
      width: var(--nav-width);
      background: #0B0E14;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 1.8rem 0.5rem;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      border-right: 1px solid rgba(0, 230, 118, 0.25);
      z-index: 40;
      box-shadow: 4px 0 20px rgba(0,0,0,0.6);
    }

    .nav-logo {
      writing-mode: vertical-rl;
      text-orientation: mixed;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 2px;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .nav-logo small {
      display: block;
      font-size: 0.65rem;
      color: var(--text-secondary);
      letter-spacing: 0.5px;
      margin-top: 0.4rem;
    }

    .nav-menu {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1.8rem;
    }

    .nav-menu li a {
      color: var(--text-secondary);
      font-size: 1.3rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
      transition: var(--transition);
      position: relative;
    }
    .nav-menu li a span {
      font-size: 0.6rem;
      margin-top: 0.2rem;
      writing-mode: vertical-rl;
      text-orientation: upright;
      letter-spacing: 1px;
    }
    .nav-menu li a:hover,
    .nav-menu li a.active {
      color: var(--primary);
      transform: translateX(3px);
    }
    .nav-login {
      font-size: 0.7rem;
      color: var(--text-secondary);
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      position: relative;
    }
    .nav-login .dot {
      width: 8px;
      height: 8px;
      background: var(--accent-red);
      border-radius: 50%;
      margin-bottom: 0.2rem;
      box-shadow: 0 0 10px var(--accent-red);
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height-mobile);
      background: rgba(13, 17, 23, 0.9);
      backdrop-filter: blur(12px);
      align-items: center;
      justify-content: space-between;
      padding: 0 1.2rem;
      z-index: 50;
      border-bottom: 1px solid var(--border-glow);
    }
    .mobile-logo {
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--primary);
    }
    .hamburger {
      font-size: 1.6rem;
      color: var(--text-primary);
      background: transparent;
      border: none;
    }
    .mobile-menu-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(8, 12, 18, 0.95);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 2rem;
      transform: translateX(-100%);
      transition: transform 0.4s ease;
      z-index: 55;
    }
    .mobile-menu-panel.open {
      transform: translateX(0);
    }
    .mobile-menu-panel a {
      color: var(--text-primary);
      font-size: 2rem;
      margin: 0.8rem 0;
      text-decoration: none;
      font-weight: 500;
    }

    /* 主内容区域 */
    .main-content {
      margin-left: var(--nav-width);
      flex: 1;
      width: calc(100% - var(--nav-width));
    }

    /* 容器 */
    .custom-container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2.5rem;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent-red);
      color: white;
      border: none;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 22px rgba(255, 61, 0, 0.7);
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(255, 61, 0, 0.9);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.12);
      color: var(--primary);
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px) saturate(180%);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .glass-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
      border-color: rgba(0,230,118,0.4);
    }

    /* Hero */
    #hero {
      padding: 5rem 0 4rem;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    #hero .overlay {
      position: absolute;
      inset: 0;
      background: rgba(13,17,23,0.88);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .live-score-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-glow);
      border-radius: 20px;
      padding: 2rem;
      text-align: center;
      font-family: var(--font-mono);
    }
    .score-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--primary);
      text-shadow: 0 0 18px #00E676;
    }

    /* features */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }
    .feature-middle {
      transform: scale(1.03);
      border-color: var(--primary);
    }

    /* scenarios */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 1.8rem;
    }

    /* cases */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }

    /* faq */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      margin-bottom: 1rem;
      padding: 0 1.5rem;
      transition: 0.25s;
    }
    .faq-item.active {
      border-left: 5px solid var(--primary);
      background: rgba(22,27,34,0.9);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .scenarios-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .side-nav { display: none; }
      .mobile-header { display: flex; }
      .main-content { margin-left: 0; width: 100%; }
      .custom-container { padding: 0 1.2rem; }
      .score-number { font-size: 2.5rem; }
    }