/* ===============================================
   VPN Admin Panel - Premium Modern UI/UX
   =============================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===============================================
   ROOT & RESET
   =============================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Neutrals */
    --bg-main: #f8f9fc;
    --bg-card: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
    
    /* Sidebar */
    --sidebar-bg: #1e293b;
    --sidebar-text: #cbd5e1;
    --sidebar-active: linear-gradient(135deg, var(--primary), var(--secondary));
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===============================================
   LOGIN PAGE
   =============================================== */
.login-page {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-box {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 32px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-muted);
}

.login-footer p {
    margin: 8px 0;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    color: white;
    font-size: 20px;
    margin-bottom: 4px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.nav-item.active {
    background: rgba(102, 126, 234, 0.1);
    border-left-color: var(--primary);
    color: white;
}

.nav-icon {
    font-size: 20px;
    margin-right: 12px;
    width: 24px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-info {
    margin-bottom: 12px;
}

.admin-name {
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.admin-email {
    color: var(--sidebar-text);
    font-size: 12px;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
}

.topbar {
    background: white;
    padding: 20px 32px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar h1 {
    font-size: 24px;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.content-wrapper {
    padding: 32px;
}

/* ===============================================
   COMPONENTS
   =============================================== */

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.card-body {
    padding: 24px;
}

/* Stat Cards */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-icon {
    font-size: 40px;
    opacity: 0.9;
}

.stat-details h3 {
    font-size: 32px;
    margin-bottom: 4px;
}

.stat-details p {
    font-size: 14px;
    opacity: 0.9;
}

.stat-badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 12px;
    margin-top: 8px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-info { background: var(--info); color: white; }
.btn-secondary { background: var(--text-secondary); color: white; }

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-xs {
    padding: 4px 8px;
    font-size: 11px;
}

.btn-block {
    width: 100%;
    display: block;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #d1fae5; color: var(--success); }
.badge-danger { background: #fee2e2; color: var(--danger); }
.badge-warning { background: #fef3c7; color: var(--warning); }
.badge-info { background: #dbeafe; color: var(--info); }
.badge-secondary { background: var(--border); color: var(--text-secondary); }

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

/* Table */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead th {
    background: var(--bg-main);
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
}

.table tbody td {
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.table tbody tr:hover {
    background: var(--bg-main);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 16px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.modal-large {
    max-width: 700px;
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 20px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
}

.modal-close:hover {
    color: var(--danger);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.flag-icon { width: 24px; height: 16px; object-fit: cover; border-radius: 2px; }
.action-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.page-actions { margin-bottom: 24px; }
.empty-state { text-align: center; padding: 60px 20px; }
.empty-icon { font-size: 64px; margin-bottom: 16px; }
.empty-state h3 { margin-bottom: 8px; color: var(--text-primary); }
.empty-state p { color: var(--text-muted); margin-bottom: 20px; }
.dashboard-grid { display: flex; flex-direction: column; gap: 24px; }
.quick-actions { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.action-btn { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 16px; }
.checkbox-item { padding: 12px; border-bottom: 1px solid var(--border); }
.checkbox-item label { display: flex; align-items: center; cursor: pointer; }
.checkbox-item input[type="checkbox"] { margin-right: 12px; }
.config-display { background: #2d2d2d; color: #f8f8f2; padding: 16px; border-radius: 8px; overflow-x: auto; font-size: 12px; }
.api-key-display { display: flex; align-items: center; gap: 8px; }
.api-key-text { font-family: 'Courier New', monospace; font-size: 12px; }
.api-usage-list { display: flex; flex-direction: column; gap: 12px; }
.usage-item { display: flex; align-items: center; gap: 16px; padding: 12px; background: var(--bg-main); border-radius: 8px; }
.usage-rank { font-size: 20px; font-weight: 700; color: var(--primary); min-width: 40px; }
.usage-details { display: flex; flex-direction: column; }
.usage-details code { display: inline; padding: 2px 6px; background: #2d2d2d; color: #f8f8f2; border-radius: 4px; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    .main-content {
        margin-left: 200px;
    }
    .stats-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .sidebar {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    .sidebar.active {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .content-wrapper,
    .topbar {
        padding: 16px;
    }
}