/* ===================================
   Professional SaaS Admin Dashboard
   Modern, Clean & Premium Design
   =================================== */

/* CSS Variables for Theme */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --sidebar-bg: #ffffff;
    --sidebar-hover: #f9fafb;
    --main-bg: #f8fafc;
    --card-bg: #ffffff;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--main-bg);
    color: var(--gray-900);
    line-height: 1.6;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   LOGIN SCREEN
   =================================== */
.login-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(139,92,246,0.08));
    backdrop-filter: blur(2px);
    z-index: 1500;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--card-bg);
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    text-align: left;
}

.login-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.login-card .subtitle {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

.error-text {
    color: var(--danger-color);
    font-size: 0.8125rem;
    margin-top: 0.75rem;
}

/* Layout Container */
.container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===================================
   SIDEBAR STYLES
   =================================== */

.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

/* Logo Section */
.logo {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--gray-200);
}

.logo h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
    letter-spacing: -0.025em;
}

.logo p {
    font-size: 0.75rem;
    color: var(--gray-500);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Navigation Menu */
.nav-menu {
    flex: 1;
    padding: 1rem 0.75rem;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.875rem;
    color: var(--gray-700);
    text-decoration: none;
    border-radius: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.nav-item .icon {
    font-size: 1.25rem;
    width: 20px;
    text-align: center;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

/* ===================================
   MAIN CONTENT AREA
   =================================== */

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.header {
    background: white;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.025em;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

/* Content Section */
.content-section {
    display: none;
    padding: 2rem;
    overflow-y: auto;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.125rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    box-shadow: var(--shadow-md);
}

.btn-refresh {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-refresh:hover {
    background: var(--gray-50);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

/* ===================================
   CARDS & STATS
   =================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition-slow);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border-radius: 0.625rem;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    color: white;
}

.stat-info {
    flex: 1;
}

.stat-info h3 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Dashboard Charts */
.dashboard-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
}

.chart-card:hover {
    box-shadow: var(--shadow-md);
}

.chart-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1.25rem;
}

.activity-list {
    max-height: 300px;
    overflow-y: auto;
}

.activity-item {
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    border-left: 3px solid var(--primary-color);
    transition: var(--transition);
}

.activity-item:hover {
    background: var(--gray-100);
    transform: translateX(4px);
}

.activity-item .time {
    font-size: 0.75rem;
    color: var(--gray-500);
    display: block;
    margin-top: 0.25rem;
}

/* Distribution Chart */
.distribution-chart {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chart-bar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bar-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.bar-container {
    position: relative;
    height: 36px;
    background: var(--gray-100);
    border-radius: 0.5rem;
    overflow: hidden;
}

.bar {
    height: 100%;
    border-radius: 0.5rem;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.bar-full {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.bar-trial {
    background: linear-gradient(90deg, var(--warning-color), #f97316);
}

.bar-value {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

/* ===================================
   FORMS
   =================================== */

.generate-form-card,
.generated-keys-card,
.settings-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.generate-form-card h3,
.generated-keys-card h3,
.settings-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1.25rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    background: white;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Keys List */
.keys-list {
    max-height: 400px;
    overflow-y: auto;
}

.key-item {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--primary-color);
}

.key-item .key-code {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.key-item .key-info {
    display: flex;
    gap: 1rem;
    font-size: 0.8125rem;
    color: var(--gray-600);
    margin-bottom: 0.75rem;
}

.key-item .key-actions {
    display: flex;
    gap: 0.5rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ===================================
   TABLES
   =================================== */

.table-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.search-input {
    flex: 1;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.filter-select {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    background: white;
    min-width: 180px;
    cursor: pointer;
}

.table-container {
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.data-table thead {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.data-table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
    font-size: 0.875rem;
    color: var(--gray-700);
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table .loading {
    text-align: center;
    padding: 2rem;
    color: var(--gray-500);
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-active {
    background: #d1fae5;
    color: #065f46;
}

.status-inactive {
    background: #fee2e2;
    color: #991b1b;
}

.status-trial {
    background: #fef3c7;
    color: #92400e;
}

.status-expired {
    background: var(--gray-200);
    color: var(--gray-700);
}

/* ===================================
   SETTINGS
   =================================== */

.config-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.config-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.config-item strong {
    color: var(--gray-700);
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ===================================
   MODAL
   =================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    padding: 2rem;
    overflow-y: auto;
}

.modal-content {
    background: white;
    margin: 2rem auto;
    padding: 2rem;
    border-radius: 0.75rem;
    max-width: 600px;
    box-shadow: var(--shadow-xl);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.close {
    float: right;
    font-size: 1.75rem;
    font-weight: 300;
    color: var(--gray-400);
    cursor: pointer;
    line-height: 1;
    transition: var(--transition);
}

.close:hover {
    color: var(--gray-700);
}

/* ===================================
   TOAST NOTIFICATIONS
   =================================== */

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--gray-900);
    color: white;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    display: none;
    z-index: 2000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast.show {
    display: block;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

.toast.warning {
    background: var(--warning-color);
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 1024px) {
    .dashboard-charts {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--gray-200);
    }
    
    .nav-menu {
        display: flex;
        overflow-x: auto;
        padding: 0.5rem;
    }
    
    .nav-item {
        flex-direction: column;
        min-width: 80px;
        text-align: center;
        gap: 0.25rem;
    }
    
    .header {
        padding: 1rem;
    }
    
    .header h1 {
        font-size: 1.25rem;
    }
    
    .content-section {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .table-controls {
        flex-direction: column;
    }
    
    .data-table {
        font-size: 0.8125rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
    }
}

/* ===================================
   LOADING STATES
   =================================== */

.loading {
    color: var(--gray-500);
    text-align: center;
    padding: 2rem;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }