/* ════════════════════════════════════════
       UniPay Gateway Design System v2.0
       Dark OLED · Glassmorphism · Tech Glow
       ════════════════════════════════════════ */
    :root {
      --bg-deep: #020617;
      --bg: #0B1120;
      --bg-surface: rgba(15,23,42,0.75);
      --bg-glass: rgba(255,255,255,0.04);
      --bg-glass-hover: rgba(255,255,255,0.08);
      --bg-glass-strong: rgba(255,255,255,0.10);
      --border: rgba(255,255,255,0.08);
      --border-hover: rgba(255,255,255,0.16);
      --text: #F1F5F9;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --primary: #38BDF8;
      --primary-dim: rgba(56,189,248,0.15);
      --primary-glow: rgba(56,189,248,0.25);
      --accent: #A78BFA;
      --accent-dim: rgba(167,139,250,0.15);
      --accent-glow: rgba(167,139,250,0.20);
      --success: #22C55E;
      --success-dim: rgba(34,197,94,0.12);
      --warning: #FBBF24;
      --warning-dim: rgba(251,191,36,0.12);
      --danger: #EF4444;
      --danger-dim: rgba(239,68,68,0.12);
      --sidebar-w: 260px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
      --shadow-elevated: 0 16px 48px rgba(0,0,0,0.45);
      --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body { height: 100%; }

    body {
      font-family: 'Inter', 'Fira Sans', -apple-system, "Microsoft YaHei", sans-serif;
      background-color: var(--bg-deep);
      background-image:
        radial-gradient(900px 500px at 90% 0%, rgba(56,189,248,0.07) 0%, transparent 60%),
        radial-gradient(800px 450px at 10% 30%, rgba(167,139,250,0.05) 0%, transparent 55%),
        radial-gradient(600px 400px at 50% 80%, rgba(34,197,94,0.03) 0%, transparent 50%);
      background-attachment: fixed;
      color: var(--text);
      font-size: 14px;
      line-height: 1.55;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a { color: inherit; text-decoration: none; }
    .mono { font-family: 'Fira Code', monospace !important; }
    .inter { font-family: 'Inter', sans-serif !important; }

    /* ═══ Layout ═══ */
    .layout { display: flex; min-height: 100vh; position: relative; }

    /* ═══ Sidebar ═══ */
    .sidebar {
      width: var(--sidebar-w);
      flex: 0 0 var(--sidebar-w);
      background: rgba(2,6,23,0.85);
      backdrop-filter: blur(20px) saturate(1.2);
      -webkit-backdrop-filter: blur(20px) saturate(1.2);
      border-right: 1px solid var(--border);
      padding: 0 14px;
      position: fixed;
      top: 0; left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      z-index: 100;
      transition: transform var(--transition);
    }
    .brand {
      display: flex; align-items: center; gap: 13px;
      padding: 22px 12px 26px;
      border-bottom: 1px solid var(--border);
      margin-bottom: 8px;
    }
    .brand-icon {
      width: 40px; height: 40px; border-radius: 12px; flex: 0 0 40px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 16px var(--primary-glow);
    }
    .brand-icon svg { width: 22px; height: 22px; stroke: #020617; }
    .brand-text { line-height: 1.2; }
    .brand-name { font-size: 17px; font-weight: 700; letter-spacing: 0.5px; }
    .brand-sub { font-size: 10.5px; color: var(--text-muted); letter-spacing: 1.5px; text-transform: uppercase; margin-top: 2px; }

    .nav { display: flex; flex-direction: column; gap: 2px; padding: 0 0 16px; overflow-y: auto; flex: 1; }
    .nav::-webkit-scrollbar { width: 4px; }
    .nav::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 4px; }
    .nav a {
      display: flex; align-items: center; gap: 13px;
      padding: 11px 14px; border-radius: var(--radius-md);
      color: var(--text-secondary); font-size: 14px; font-weight: 450;
      transition: all var(--transition); cursor: pointer; position: relative;
    }
    .nav a svg { width: 20px; height: 20px; flex: 0 0 20px; opacity: 0.7; transition: opacity var(--transition); }
    .nav a:hover { background: var(--bg-glass-hover); color: var(--text); }
    .nav a:hover svg { opacity: 1; }
    .nav a.active {
      background: linear-gradient(90deg, var(--primary-dim) 0%, transparent 90%);
      color: var(--primary); font-weight: 500;
    }
    .nav a.active::before {
      content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
      width: 3px; height: 22px; background: var(--primary);
      border-radius: 0 3px 3px 0; box-shadow: 0 0 12px var(--primary-glow);
    }
    .nav a.active svg { opacity: 1; color: var(--primary); }
    .nav-group { font-size: 10.5px; color: var(--text-muted); padding: 16px 14px 4px; letter-spacing: 1.2px; text-transform: uppercase; font-weight: 600; }
    .sidebar-footer {
      padding: 16px 12px 20px; border-top: 1px solid var(--border);
      font-size: 11.5px; color: var(--text-muted);
    }

    /* ═══ Main Content ═══ */
    .main { flex: 1; margin-left: var(--sidebar-w); min-width: 0; padding: 28px 36px 48px; transition: margin var(--transition); }
    .topbar {
      display: flex; justify-content: space-between; align-items: center;
      margin-bottom: 28px; gap: 16px; flex-wrap: wrap;
    }
    .topbar-left { min-width: 0; }
    .topbar h1 { font-size: 24px; font-weight: 650; letter-spacing: -0.3px; }
    .topbar .sub { font-size: 13px; color: var(--text-secondary); margin-top: 3px; }
    .topbar-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

    .menu-toggle {
      display: none; align-items: center; justify-content: center;
      width: 40px; height: 40px; border-radius: var(--radius-md);
      background: var(--bg-glass); border: 1px solid var(--border);
      color: var(--text); cursor: pointer; transition: all var(--transition);
    }
    .menu-toggle:hover { background: var(--bg-glass-hover); border-color: var(--border-hover); }
    .menu-toggle svg { width: 20px; height: 20px; }

    /* ═══ Cards ═══ */
    .card {
      background: var(--bg-glass);
      backdrop-filter: blur(16px) saturate(1.1);
      -webkit-backdrop-filter: blur(16px) saturate(1.1);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 24px;
      margin-bottom: 24px;
      box-shadow: var(--shadow-card);
      transition: border-color var(--transition);
    }
    .card:hover { border-color: var(--border-hover); }
    .card-header {
      display: flex; align-items: center; gap: 10px;
      margin-bottom: 20px; padding-bottom: 14px;
      border-bottom: 1px solid var(--border);
    }
    .card-header .dot {
      width: 8px; height: 8px; border-radius: 50%; flex: 0 0 8px;
      background: var(--primary); box-shadow: 0 0 10px var(--primary-glow);
    }
    .card-header h3 { font-size: 15px; font-weight: 600; }
    .card-header .tag {
      margin-left: auto; font-size: 11px; color: var(--text-muted);
      padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border);
    }

    /* ═══ Stats Grid ═══ */
    .stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(175px, 1fr)); gap: 16px; margin-bottom: 28px; }
    .stat {
      background: var(--bg-glass); border: 1px solid var(--border);
      border-radius: var(--radius-lg); padding: 20px 22px;
      position: relative; overflow: hidden;
      transition: all var(--transition); cursor: default;
    }
    .stat:hover { transform: translateY(-3px); border-color: var(--border-hover); box-shadow: var(--shadow-elevated); }
    .stat-shine {
      position: absolute; top: -50%; right: -40%;
      width: 120px; height: 120px; border-radius: 50%;
      background: radial-gradient(circle, rgba(56,189,248,0.10), transparent 70%);
      pointer-events: none;
    }
    .stat .num { font-size: 30px; font-weight: 700; font-family: 'Fira Code', monospace; color: #fff; letter-spacing: -0.5px; }
    .stat .label { font-size: 12.5px; color: var(--text-secondary); margin-top: 6px; font-weight: 450; }
    .stat.primary .num { color: var(--primary); }
    .stat.accent .num { color: var(--accent); }
    .stat.green .num { color: var(--success); }
    .stat.danger .num { color: var(--danger); }
    .stat.gold .num { color: var(--warning); }

    /* ═══ Tables ═══ */
    .table-wrap { overflow-x: auto; border-radius: var(--radius-sm); }
    .table-wrap::-webkit-scrollbar { height: 5px; }
    .table-wrap::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
    table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 680px; }
    th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
    th {
      color: var(--text-muted); font-weight: 600; font-size: 11.5px;
      text-transform: uppercase; letter-spacing: 0.8px;
      background: rgba(255,255,255,0.015);
    }
    tbody tr { transition: background var(--transition); }
    tbody tr:hover { background: var(--bg-glass-hover); }
    td { font-size: 13.5px; }
    td.mono { font-family: 'Fira Code', monospace; font-size: 12.5px; }
    td a { color: var(--primary); transition: color var(--transition); }
    td a:hover { color: #7dd3fc; }

    /* ═══ Badge / Status ═══ */
    .badge {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 3px 11px 3px 10px; border-radius: 999px;
      font-size: 12px; font-weight: 500; border: 1px solid transparent;
      white-space: nowrap;
    }
    .badge::before {
      content: ''; width: 6px; height: 6px; border-radius: 50%;
      flex: 0 0 6px;
    }
    .b-PAID { color: var(--success); background: var(--success-dim); border-color: rgba(34,197,94,0.2); }
    .b-PAID::before { background: var(--success); box-shadow: 0 0 6px var(--success); }
    .b-PENDING { color: var(--warning); background: var(--warning-dim); border-color: rgba(251,191,36,0.2); }
    .b-PENDING::before { background: var(--warning); box-shadow: 0 0 6px var(--warning); }
    .b-CANCELLED, .b-CLOSED, .b-FAILED { color: var(--text-secondary); background: var(--bg-glass-strong); border-color: var(--border); }
    .b-CANCELLED::before, .b-CLOSED::before, .b-FAILED::before { background: var(--text-muted); }
    .b-REFUNDED, .b-FAILED { color: var(--danger); background: var(--danger-dim); border-color: rgba(239,68,68,0.2); }
    .b-REFUNDED::before { background: var(--danger); box-shadow: 0 0 6px var(--danger); }
    .b-REFUNDING, .b-PROCESSING { color: var(--accent); background: var(--accent-dim); border-color: rgba(167,139,250,0.2); }
    .b-REFUNDING::before, .b-PROCESSING::before { background: var(--accent); box-shadow: 0 0 6px var(--accent-glow); }
    .b-SUCCESS { color: var(--success); background: var(--success-dim); border-color: rgba(34,197,94,0.2); }
    .b-SUCCESS::before { background: var(--success); }
    .b-DONE { color: var(--primary); background: var(--primary-dim); border-color: rgba(56,189,248,0.2); }
    .b-DONE::before { background: var(--primary); }

    /* ═══ Buttons ═══ */
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 10px 20px;
      background: linear-gradient(135deg, var(--primary), #0EA5E9);
      color: #020617; border: none; border-radius: var(--radius-md);
      cursor: pointer; font-size: 14px; font-weight: 600;
      font-family: 'Inter', sans-serif;
      transition: all var(--transition); white-space: nowrap;
      box-shadow: 0 2px 8px rgba(56,189,248,0.2);
    }
    .btn:hover { filter: brightness(1.1); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(56,189,248,0.3); }
    .btn:active { transform: translateY(0); }
    .btn-sm { padding: 7px 14px; font-size: 12.5px; border-radius: var(--radius-sm); }
    .btn-ghost {
      background: var(--bg-glass); color: var(--text); border: 1px solid var(--border);
      box-shadow: none;
    }
    .btn-ghost:hover { background: var(--bg-glass-hover); border-color: var(--border-hover); filter: none; box-shadow: none; transform: translateY(-1px); }
    .btn-danger { background: linear-gradient(135deg, #EF4444, #DC2626); color: #fff; box-shadow: 0 2px 8px rgba(239,68,68,0.2); }
    .btn-danger:hover { box-shadow: 0 6px 20px rgba(239,68,68,0.3); }
    .btn-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); box-shadow: none; }

    /* ═══ Forms ═══ */
    .form-group { margin-bottom: 18px; }
    .form-group label { display: block; font-size: 13px; margin-bottom: 7px; color: var(--text-secondary); font-weight: 500; }
    .form-group input, .form-group select, .form-group textarea {
      width: 100%; padding: 10px 14px;
      background: rgba(2,6,23,0.6); color: var(--text);
      border: 1px solid var(--border); border-radius: var(--radius-sm);
      font-size: 14px; font-family: 'Inter', sans-serif;
      transition: all var(--transition);
    }
    .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
      outline: none; border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-dim), 0 0 12px rgba(56,189,248,0.08);
    }
    .form-group input::placeholder { color: var(--text-muted); }
    .row { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end; }
    .row > * { flex: 1; min-width: 160px; }

    /* ═══ Login ═══ */
    .login-wrap {
      display: flex; align-items: center; justify-content: center;
      min-height: 100vh; padding: 24px;
      background: var(--bg-deep);
      background-image:
        radial-gradient(800px 500px at 50% 20%, rgba(56,189,248,0.08) 0%, transparent 60%),
        radial-gradient(700px 400px at 30% 80%, rgba(167,139,250,0.06) 0%, transparent 55%);
    }
    .login-card {
      width: 400px; max-width: 100%;
      background: rgba(15,23,42,0.8);
      backdrop-filter: blur(24px) saturate(1.2);
      -webkit-backdrop-filter: blur(24px) saturate(1.2);
      border: 1px solid rgba(255,255,255,0.10);
      border-radius: var(--radius-xl);
      padding: 42px 36px 36px;
      box-shadow: 0 24px 80px rgba(0,0,0,0.5);
      position: relative; overflow: hidden;
    }
    .login-card::before {
      content: ''; position: absolute; top: -60%; left: -30%;
      width: 300px; height: 300px; border-radius: 50%;
      background: radial-gradient(circle, var(--primary-dim) 0%, transparent 70%);
      pointer-events: none;
    }
    .login-card::after {
      content: ''; position: absolute; bottom: -40%; right: -20%;
      width: 250px; height: 250px; border-radius: 50%;
      background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
      pointer-events: none;
    }
    .login-brand {
      display: flex; flex-direction: column; align-items: center;
      text-align: center; padding: 0 0 30px; position: relative; z-index: 1;
    }
    .login-brand .brand-icon { width: 52px; height: 52px; flex: 0 0 52px; margin-bottom: 14px; }
    .login-brand .brand-icon svg { width: 28px; height: 28px; }
    .login-brand h2 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
    .login-brand p { font-size: 13px; color: var(--text-secondary); }
    .login-card form { position: relative; z-index: 1; }
    .login-card .error {
      color: var(--danger); font-size: 13px; margin-bottom: 16px;
      text-align: center; background: var(--danger-dim);
      padding: 10px; border-radius: var(--radius-sm);
      border: 1px solid rgba(239,68,68,0.15);
    }
    .login-card input { background: rgba(2,6,23,0.7); }

    /* ═══ Pager ═══ */
    .pager { display: flex; align-items: center; gap: 12px; margin-top: 20px; font-size: 13px; color: var(--text-muted); }
    .pager a { color: var(--primary); }

    /* ═══ KV Table ═══ */
    .kv { width: 100%; border-collapse: collapse; }
    .kv th {
      width: 160px; text-align: left; color: var(--text-secondary);
      font-weight: 500; background: none; text-transform: none;
      letter-spacing: 0; font-size: 13px; padding: 12px 16px;
      border-bottom: 1px solid var(--border);
    }
    .kv td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
    .kv tr:last-child th, .kv tr:last-child td { border-bottom: none; }

    /* ═══ Misc ═══ */
    pre.code-block {
      background: rgba(2,6,23,0.6); border: 1px solid var(--border);
      border-radius: var(--radius-md); padding: 16px; overflow-x: auto;
      font-family: 'Fira Code', monospace; font-size: 12.5px; color: #cbd5e1;
      line-height: 1.7;
    }
    .empty { text-align: center; color: var(--text-muted); padding: 32px 16px; font-size: 14px; }

    /* ═══ Toast ═══ */
    .toast-result { margin-top: 14px; display: none; }

    /* ═══ Responsive ═══ */
    @media (max-width: 960px) {
      .sidebar { transform: translateX(-100%); }
      .sidebar.open { transform: translateX(0); box-shadow: 4px 0 40px rgba(0,0,0,0.5); }
      .main { margin-left: 0; padding: 20px 18px 40px; }
      .menu-toggle { display: inline-flex; }
      .stats { grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); }
    }
    @media (max-width: 600px) {
      .topbar h1 { font-size: 20px; }
      .card { padding: 18px; }
      .stats { grid-template-columns: 1fr 1fr; gap: 12px; }
      .login-card { padding: 32px 22px; }
    }

    /* ═══ Reduced Motion ═══ */
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { transition: none !important; transform: none !important; animation: none !important; }
    }

    /* ═══ Scrollbar ═══ */
    ::-webkit-scrollbar { width: 6px; height: 6px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
    ::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }