/* WireGuard Panel - Premium Dark Theme CSS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-card-hover: #1f293d;
    --bg-input: #0d1321;
    --border-color: #2a3550;
    --border-active: #3b82f6;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --purple: #8b5cf6;
    --purple-bg: rgba(139, 92, 246, 0.15);
    --gradient-1: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-2: linear-gradient(135deg, #10b981, #3b82f6);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ==================== LAYOUT ==================== */
.app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex; flex-direction: column;
    position: fixed; top: 0; left: 0; bottom: 0;
    z-index: 100;
    transition: var(--transition);
}
.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center; gap: 12px;
}
.sidebar-header .logo {
    width: 40px; height: 40px;
    background: var(--gradient-1);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
}
.sidebar-header h1 {
    font-size: 16px; font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.sidebar-header .version {
    font-size: 11px; color: var(--text-muted);
    font-weight: 400; display: block;
    -webkit-text-fill-color: var(--text-muted);
}
.sidebar-nav { flex: 1; padding: 12px; overflow-y: auto; }
.nav-section { margin-bottom: 8px; }
.nav-section-title {
    font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
    color: var(--text-muted); padding: 8px 12px; font-weight: 600;
}
.nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 12px; border-radius: var(--radius-sm);
    color: var(--text-secondary); cursor: pointer;
    transition: var(--transition); font-size: 14px; font-weight: 500;
    text-decoration: none;
}
.nav-item:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent); font-weight: 600;
}
.nav-item .icon { font-size: 18px; width: 24px; text-align: center; }
.nav-item .badge {
    margin-left: auto; background: var(--accent);
    color: white; font-size: 11px; padding: 2px 8px;
    border-radius: 10px; font-weight: 600;
}
.sidebar-footer {
    padding: 16px; border-top: 1px solid var(--border-color);
}
.sidebar-footer .btn-logout {
    width: 100%; padding: 10px;
    background: var(--danger-bg); color: var(--danger);
    border: 1px solid rgba(239,68,68,0.2); border-radius: var(--radius-sm);
    cursor: pointer; font-size: 13px; font-weight: 500;
    transition: var(--transition);
}
.sidebar-footer .btn-logout:hover {
    background: var(--danger); color: white;
}

/* Main Content */
.main-content {
    margin-left: 260px; flex: 1;
    padding: 24px; min-height: 100vh;
}
.page-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 24px;
}
.page-header h2 {
    font-size: 24px; font-weight: 700;
}
.page-header .subtitle {
    color: var(--text-secondary); font-size: 14px; margin-top: 4px;
}

/* ==================== CARDS ==================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: var(--transition);
}
.card:hover {
    border-color: var(--border-active);
    box-shadow: 0 0 20px var(--accent-glow);
}
.card-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px;
}
.card-header h3 { font-size: 16px; font-weight: 600; }
.card-grid {
    display: grid; gap: 16px;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* Stats Cards */
.stats-grid {
    display: grid; gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    margin-bottom: 24px;
}
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex; align-items: center; gap: 16px;
    transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-icon {
    width: 48px; height: 48px;
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
}
.stat-icon.blue { background: rgba(59,130,246,0.15); color: var(--accent); }
.stat-icon.green { background: var(--success-bg); color: var(--success); }
.stat-icon.purple { background: var(--purple-bg); color: var(--purple); }
.stat-icon.orange { background: var(--warning-bg); color: var(--warning); }
.stat-value { font-size: 28px; font-weight: 700; line-height: 1; }
.stat-label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px; border-radius: var(--radius-sm);
    font-size: 13px; font-weight: 500; cursor: pointer;
    border: none; transition: var(--transition);
    text-decoration: none;
}
.btn-primary {
    background: var(--accent); color: white;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 16px var(--accent-glow); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }
.btn-danger:hover { background: var(--danger); color: white; }
.btn-outline {
    background: transparent; color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.btn-icon {
    width: 32px; height: 32px; padding: 0;
    display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius-sm); cursor: pointer; border: none;
    background: var(--bg-input); color: var(--text-secondary);
    transition: var(--transition);
}
.btn-icon:hover { background: var(--accent); color: white; }

/* ==================== FORMS ==================== */
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block; font-size: 13px; font-weight: 500;
    color: var(--text-secondary); margin-bottom: 6px;
}
.form-control {
    width: 100%; padding: 10px 14px;
    background: var(--bg-input); border: 1px solid var(--border-color);
    border-radius: var(--radius-sm); color: var(--text-primary);
    font-size: 14px; font-family: inherit;
    transition: var(--transition);
}
.form-control:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-control::placeholder { color: var(--text-muted); }
select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }
.toggle {
    position: relative; width: 44px; height: 24px;
    display: inline-block; cursor: pointer;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle .slider {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: var(--border-color); border-radius: 24px;
    transition: var(--transition);
}
.toggle .slider::before {
    content: ''; position: absolute;
    width: 18px; height: 18px; bottom: 3px; left: 3px;
    background: white; border-radius: 50%;
    transition: var(--transition);
}
.toggle input:checked + .slider { background: var(--success); }
.toggle input:checked + .slider::before { transform: translateX(20px); }

/* ==================== TABLE ==================== */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.table-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}
.table-header h3 { font-size: 16px; font-weight: 600; }
table {
    width: 100%; border-collapse: collapse;
}
th, td {
    padding: 12px 20px; text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
}
th {
    font-weight: 600; color: var(--text-secondary);
    font-size: 12px; text-transform: uppercase;
    letter-spacing: 0.5px; background: var(--bg-secondary);
}
tr:hover td { background: var(--bg-card-hover); }
tr:last-child td { border-bottom: none; }

/* ==================== CLIENT CARD ==================== */
.client-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: var(--transition);
}
.client-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}
.client-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 12px;
}
.client-name {
    font-size: 15px; font-weight: 600;
    display: flex; align-items: center; gap: 8px;
}
.client-status {
    width: 8px; height: 8px; border-radius: 50%;
    display: inline-block;
}
.client-status.online { background: var(--success); box-shadow: 0 0 8px var(--success); }
.client-status.offline { background: var(--text-muted); }
.client-info {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 8px; margin-bottom: 12px;
}
.client-info-item {
    font-size: 12px; color: var(--text-secondary);
}
.client-info-item span {
    display: block; color: var(--text-primary);
    font-weight: 500; font-size: 13px;
}
.client-actions {
    display: flex; gap: 6px; justify-content: flex-end;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* ==================== MODAL ==================== */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    z-index: 1000; opacity: 0; visibility: hidden;
    transition: var(--transition);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px; width: 90%; max-width: 520px;
    max-height: 85vh; overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: var(--transition);
}
.modal-overlay.active .modal { transform: scale(1); }
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 20px;
}
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close {
    width: 32px; height: 32px; border-radius: 50%;
    background: var(--bg-card); border: none;
    color: var(--text-secondary); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; transition: var(--transition);
}
.modal-close:hover { background: var(--danger); color: white; }
.modal-footer {
    display: flex; gap: 8px; justify-content: flex-end;
    margin-top: 20px; padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* ==================== QR CODE ==================== */
.qr-container {
    text-align: center; padding: 20px;
}
.qr-container img {
    max-width: 240px; border-radius: var(--radius-sm);
    border: 4px solid white;
}

/* ==================== LOGIN ==================== */
.login-page {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-primary);
    background-image: radial-gradient(circle at 50% 0%, rgba(59,130,246,0.1), transparent 60%);
}
.login-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px; width: 100%; max-width: 420px;
    box-shadow: var(--shadow-lg);
}
.login-card .logo-container {
    text-align: center; margin-bottom: 32px;
}
.login-card .logo-icon {
    width: 64px; height: 64px;
    background: var(--gradient-1);
    border-radius: 16px;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 32px; margin-bottom: 16px;
}
.login-card h2 {
    font-size: 24px; font-weight: 700; text-align: center;
    margin-bottom: 8px;
}
.login-card .subtitle {
    text-align: center; color: var(--text-secondary);
    font-size: 14px; margin-bottom: 32px;
}

/* ==================== TAGS ==================== */
.tag {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 3px 10px; border-radius: 20px;
    font-size: 11px; font-weight: 600;
}
.tag-blue { background: rgba(59,130,246,0.15); color: var(--accent); }
.tag-green { background: var(--success-bg); color: var(--success); }
.tag-red { background: var(--danger-bg); color: var(--danger); }
.tag-purple { background: var(--purple-bg); color: var(--purple); }
.tag-orange { background: var(--warning-bg); color: var(--warning); }

/* ==================== TOAST ==================== */
.toast-container {
    position: fixed; top: 20px; right: 20px;
    z-index: 2000; display: flex;
    flex-direction: column; gap: 8px;
}
.toast {
    padding: 12px 20px; border-radius: var(--radius-sm);
    font-size: 13px; font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
    min-width: 280px;
    display: flex; align-items: center; gap: 8px;
}
.toast-success { background: var(--success); color: white; }
.toast-error { background: var(--danger); color: white; }
.toast-info { background: var(--accent); color: white; }
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
    text-align: center; padding: 48px 24px;
    color: var(--text-muted);
}
.empty-state .icon { font-size: 48px; margin-bottom: 16px; opacity: 0.5; }
.empty-state p { font-size: 15px; margin-bottom: 16px; }

/* ==================== IP POOL ==================== */
.ip-pool-grid {
    display: grid; gap: 4px;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
}
.ip-cell {
    padding: 6px 8px; border-radius: 6px;
    font-size: 11px; font-family: 'Inter', monospace;
    text-align: center; font-weight: 500;
}
.ip-cell.server { background: var(--purple-bg); color: var(--purple); }
.ip-cell.used { background: rgba(59,130,246,0.12); color: var(--accent); }
.ip-cell.available { background: var(--bg-input); color: var(--text-muted); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .card-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; }
}

/* Loading spinner */
.spinner {
    width: 32px; height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 40px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Animations */
.fade-in { animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }