:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: var(--primary-light); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: var(--bg-card); border-right: 1px solid var(--border); padding: 24px 0; flex-shrink: 0; }
.sidebar-brand { padding: 0 24px 24px; font-size: 20px; font-weight: 700; color: var(--primary-light); border-bottom: 1px solid var(--border); }
.sidebar-nav { padding: 16px 0; }
.sidebar-nav a { display: flex; align-items: center; gap: 10px; padding: 10px 24px; color: var(--text-muted); transition: all .2s; }
.sidebar-nav a:hover, .sidebar-nav a.active { color: var(--text); background: rgba(99,102,241,.1); text-decoration: none; }
.sidebar-nav a.active { border-right: 3px solid var(--primary); }
.main-content { flex: 1; padding: 32px; overflow-x: auto; }

/* Login */
.login-wrapper { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-card { background: var(--bg-card); border-radius: 16px; padding: 48px 40px; width: 100%; max-width: 420px; box-shadow: 0 25px 50px rgba(0,0,0,.3); }
.login-card h1 { text-align: center; margin-bottom: 8px; font-size: 28px; }
.login-card p { text-align: center; color: var(--text-muted); margin-bottom: 32px; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-muted); font-weight: 500; }
.form-control { width: 100%; padding: 10px 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; outline: none; transition: border-color .2s; }
.form-control:focus { border-color: var(--primary); }
select.form-control { cursor: pointer; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 20px; border: none; border-radius: 8px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s; text-decoration: none; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: .9; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: .9; }
.btn-warning { background: var(--warning); color: #000; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-block { width: 100%; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* Cards & Stats */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.page-header h1 { font-size: 24px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: var(--bg-card); border-radius: 12px; padding: 20px; border: 1px solid var(--border); }
.stat-card .stat-label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.stat-card .stat-value { font-size: 28px; font-weight: 700; }
.stat-card .stat-value.green { color: var(--success); }
.stat-card .stat-value.yellow { color: var(--warning); }
.stat-card .stat-value.red { color: var(--danger); }
.stat-card .stat-value.blue { color: var(--info); }

/* Table */
.card { background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
.card-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.card-header h2 { font-size: 16px; }
.card-body { padding: 20px; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 12px 16px; font-size: 12px; text-transform: uppercase; color: var(--text-muted); border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,.02); }

/* Badges */
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge-active { background: rgba(34,197,94,.15); color: var(--success); }
.badge-expired { background: rgba(239,68,68,.15); color: var(--danger); }
.badge-disabled { background: rgba(148,163,184,.15); color: var(--text-muted); }
.badge-unused { background: rgba(59,130,246,.15); color: var(--info); }
.badge-activated { background: rgba(34,197,94,.15); color: var(--success); }
.badge-basic { background: rgba(148,163,184,.15); color: var(--text-muted); }
.badge-pro { background: rgba(99,102,241,.15); color: var(--primary-light); }
.badge-premium { background: rgba(245,158,11,.15); color: var(--warning); }

/* Modal */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal { background: var(--bg-card); border-radius: 16px; padding: 32px; width: 90%; max-width: 520px; max-height: 85vh; overflow-y: auto; box-shadow: 0 25px 50px rgba(0,0,0,.4); }
.modal h2 { margin-bottom: 20px; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 24px; }

/* Pagination */
.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 16px; }
.pagination button { padding: 6px 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 6px; color: var(--text); cursor: pointer; }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }
.pagination button.active { background: var(--primary); border-color: var(--primary); }
.pagination span { color: var(--text-muted); font-size: 14px; }

/* Filter bar */
.filter-bar { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.filter-bar .form-control { width: 200px; padding: 8px 12px; }

/* Toast */
.toast-container { position: fixed; top: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: 8px; color: #fff; font-size: 14px; animation: slideIn .3s ease; min-width: 250px; }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Textarea for results */
.result-box { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 16px; font-family: 'Courier New', monospace; font-size: 13px; white-space: pre-wrap; word-break: break-all; max-height: 400px; overflow-y: auto; margin-top: 12px; }

/* Tabs */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab { padding: 10px 20px; cursor: pointer; color: var(--text-muted); border-bottom: 2px solid transparent; transition: all .2s; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--primary-light); border-bottom-color: var(--primary); }

/* User dashboard */
.profile-card { background: var(--bg-card); border-radius: 12px; padding: 24px; border: 1px solid var(--border); margin-bottom: 24px; }
.profile-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.profile-item { }
.profile-item .label { font-size: 12px; color: var(--text-muted); margin-bottom: 2px; }
.profile-item .value { font-size: 16px; font-weight: 600; }

/* Chat */
.chat-container { display: flex; gap: 16px; height: calc(100vh - 120px); }
.chat-sidebar { width: 260px; background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; flex-shrink: 0; }
.chat-sidebar-header { padding: 16px; border-bottom: 1px solid var(--border); }
.chat-list { flex: 1; overflow-y: auto; padding: 8px; }
.chat-item { padding: 10px 12px; border-radius: 8px; cursor: pointer; margin-bottom: 4px; display: flex; justify-content: space-between; align-items: center; }
.chat-item:hover { background: rgba(255,255,255,.05); }
.chat-item.active { background: rgba(99,102,241,.15); }
.chat-item-title { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.chat-item-delete { opacity: 0; cursor: pointer; color: var(--text-muted); padding: 2px 6px; border-radius: 4px; }
.chat-item:hover .chat-item-delete { opacity: 1; }
.chat-item-delete:hover { color: var(--danger); background: rgba(239,68,68,.1); }
.chat-main { flex: 1; display: flex; flex-direction: column; background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
.chat-messages { flex: 1; overflow-y: auto; padding: 24px; }
.chat-empty { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); font-size: 18px; }
.message { margin-bottom: 20px; max-width: 80%; }
.message.user { margin-left: auto; }
.message .bubble { padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.6; white-space: pre-wrap; word-wrap: break-word; }
.message.user .bubble { background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.message.assistant .bubble { background: var(--bg-input); border-bottom-left-radius: 4px; }
.message .meta { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.message.user .meta { text-align: right; }
.chat-input-area { padding: 16px; border-top: 1px solid var(--border); display: flex; gap: 12px; align-items: flex-end; }
.chat-input-area textarea { flex: 1; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: 10px 14px; font-size: 14px; font-family: inherit; resize: none; outline: none; max-height: 120px; }
.chat-input-area textarea:focus { border-color: var(--primary); }
.model-select { padding: 8px 12px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 13px; }

/* Responsive */
@media (max-width: 768px) {
    .layout { flex-direction: column; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 12px 0; }
    .sidebar-nav { display: flex; overflow-x: auto; padding: 0; }
    .sidebar-nav a { padding: 8px 16px; white-space: nowrap; }
    .sidebar-nav a.active { border-right: none; border-bottom: 3px solid var(--primary); }
    .main-content { padding: 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { flex-direction: column; }
    .chat-container { flex-direction: column; height: auto; }
    .chat-sidebar { width: 100%; height: 200px; }
    .chat-main { height: 60vh; }
}