:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --border: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg-primary); color: var(--text-primary); font-family: 'Inter', system-ui, -apple-system, sans-serif; }
a { text-decoration: none; color: inherit; }

/* Sidebar */
.sidebar { background: var(--bg-secondary); border-right: 1px solid var(--border); width: 250px; min-height: 100vh; position: fixed; top: 0; left: 0; display: flex; flex-direction: column; }
.sidebar-brand { padding: 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 12px; }
.sidebar-brand i { font-size: 24px; color: var(--accent); }
.sidebar-brand .name { font-weight: 700; font-size: 16px; }
.sidebar-brand .ver { font-size: 11px; color: var(--text-secondary); }
.sidebar nav { margin-top: 8px; flex: 1; }
.sidebar nav a { display: flex; align-items: center; padding: 12px 20px; color: var(--text-secondary); border-left: 3px solid transparent; transition: all .2s; }
.sidebar nav a:hover, .sidebar nav a.active { background: rgba(59,130,246,.1); color: var(--accent); border-left-color: var(--accent); }
.sidebar nav a i { width: 24px; margin-right: 12px; text-align: center; }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid var(--border); }
.sidebar-footer a { color: var(--text-secondary); font-size: 14px; }
.sidebar-footer a:hover { color: var(--danger); }

/* Main */
.main { margin-left: 250px; padding: 24px; }
.page-title { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.page-sub { color: var(--text-secondary); margin-bottom: 24px; }

/* Cards */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.card + .card { margin-top: 16px; }

/* Buttons */
.btn { padding: 8px 16px; border-radius: 8px; font-weight: 500; cursor: pointer; border: none; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; transition: all .2s; color: white; }
.btn-primary { background: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: var(--success); }
.btn-danger { background: var(--danger); }
.btn-warning { background: var(--warning); color: #000; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 6px 10px; font-size: 13px; }

/* Badges */
.badge { padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-success { background: rgba(34,197,94,.15); color: var(--success); }
.badge-danger { background: rgba(239,68,68,.15); color: var(--danger); }

/* Inputs */
input, select { background: var(--bg-primary); border: 1px solid var(--border); color: var(--text-primary); padding: 8px 12px; border-radius: 8px; width: 100%; font-size: 14px; }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,.2); }
label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }

/* Grid */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } .sidebar { display: none; } .main { margin-left: 0; } }

/* Stats */
.stat-value { font-size: 28px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.progress-bar { height: 6px; background: var(--bg-primary); border-radius: 3px; overflow: hidden; margin-top: 8px; }
.progress-bar-fill { height: 100%; border-radius: 3px; transition: width .3s; }

/* Table */
table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 12px; color: var(--text-secondary); font-size: 13px; font-weight: 600; text-transform: uppercase; border-bottom: 1px solid var(--border); }
td { padding: 12px; border-bottom: 1px solid var(--border); }
tr:hover { background: rgba(59,130,246,.05); }

/* Modal */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,.6); z-index: 50; display: none; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 12px; padding: 24px; width: 90%; max-width: 500px; }
.modal h3 { font-size: 18px; font-weight: 700; margin-bottom: 16px; }

/* Toast */
.toast { position: fixed; top: 20px; right: 20px; z-index: 100; padding: 12px 20px; border-radius: 8px; color: white; font-weight: 500; transform: translateX(120%); transition: transform .3s; }
.toast.show { transform: translateX(0); }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* Utilities */
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.ml-3 { margin-left: 12px; }
.mr-1 { margin-right: 4px; }
.mr-2 { margin-right: 8px; }
.mr-3 { margin-right: 12px; }
.py-12 { padding-top: 48px; padding-bottom: 48px; }
.text-center { text-align: center; }
.text-sm { font-size: 13px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }
.text-4xl { font-size: 36px; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.w-full { width: 100%; }
.section-divider { border-top: 1px solid var(--border); padding-top: 16px; margin-top: 16px; }
code { font-size: 12px; cursor: pointer; background: var(--bg-primary); padding: 2px 6px; border-radius: 4px; }
pre { background: var(--bg-primary); padding: 12px; border-radius: 8px; max-height: 400px; overflow: auto; font-size: 12px; white-space: pre-wrap; }

/* Collapsible sections */
.section-divider .fa-chevron-right, .section-divider .fa-chevron-down { transition: transform .2s; }

/* Client cards */
.client-card { background: var(--bg-primary); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.client-card + .client-card { margin-top: 10px; }
.client-card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.client-card-secret { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; background: rgba(0,0,0,.25); padding: 8px 12px; border-radius: 8px; }
.client-card-secret code { flex: 1; background: none; padding: 0; font-size: 13px; color: var(--text-secondary); letter-spacing: .5px; }
.client-card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 16px; margin-bottom: 14px; }
.client-card-stat .stat-label { margin-bottom: 2px; font-size: 12px; }
.client-card-stat .stat-value-sm { font-weight: 600; font-size: 14px; }
.client-card-actions { display: flex; gap: 8px; flex-wrap: wrap; border-top: 1px solid var(--border); padding-top: 12px; }
.client-card-actions .btn { font-size: 12px; padding: 5px 10px; }
.client-card .progress-bar { margin-top: 6px; margin-bottom: 0; }
.traffic-pct { font-size: 11px; color: var(--text-secondary); margin-left: 6px; }
@media (min-width: 768px) { .client-card-grid.grid-4 { grid-template-columns: repeat(4, 1fr); } }

/* Language switcher */
.lang-switcher { display: flex; gap: 4px; margin-bottom: 8px; padding: 0 20px; }
.lang-btn { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); padding: 4px 8px; border-radius: 4px; cursor: pointer; font-size: 12px; font-weight: 600; transition: all .2s; }
.lang-btn:hover, .lang-btn.active { border-color: var(--accent); color: var(--accent); }
.lang-switcher-login { display: flex; gap: 4px; justify-content: center; margin-top: 16px; }