/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-card: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #333333;
    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    --accent-secondary: #3b3b3b;
    --accent-secondary-hover: #4a4a4a;
    --success: #22c55e;
    --warning: #eab308;
    --danger: #ef4444;
    --info: #3b82f6;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.6);
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Utilities ===== */
.hidden {
    display: none !important;
}

/* ===== Screens ===== */
.screen {
    min-height: 100vh;
}

/* ===== Login Screen ===== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1a2e 100%);
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.login-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.login-card h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-subtitle {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 14px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 15px;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.error-message {
    color: var(--danger);
    font-size: 14px;
    margin-top: 16px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--accent-secondary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--accent-secondary-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

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

.btn-loading {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 28px;
}

.header h1 {
    font-size: 20px;
    font-weight: 600;
}

/* ===== Main Content ===== */
.main-content {
    padding: 32px;
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 32px;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

/* ===== Actions Bar ===== */
.actions-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.actions-left, .actions-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.select {
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    font-family: inherit;
}

.select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* ===== Table ===== */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

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

.keys-table th, .keys-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.keys-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

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

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

.loading-row td {
    text-align: center;
    color: var(--text-secondary);
    padding: 48px;
}

.empty-row td {
    text-align: center;
    color: var(--text-muted);
    padding: 48px;
}

/* Key Cell */
.key-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}

.key-cell code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 13px;
    background: var(--bg-tertiary);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition);
    font-size: 14px;
}

.copy-btn:hover {
    opacity: 1;
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.status-active {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.status-used {
    background: rgba(59, 130, 246, 0.15);
    color: var(--info);
}

.status-expired {
    background: rgba(234, 179, 8, 0.15);
    color: var(--warning);
}

.status-revoked {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

/* Actions Column */
.actions-cell {
    display: flex;
    gap: 8px;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    opacity: 0.7;
}

.action-btn:hover {
    opacity: 1;
    background: var(--bg-tertiary);
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

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

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

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

.modal-body {
    padding: 24px;
}

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

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

.form-group:last-child {
    margin-bottom: 0;
}

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

.form-group input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Success Modal */
.modal-success .modal-body {
    text-align: center;
}

.key-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.key-display code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--accent-primary);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
    z-index: 2000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

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

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .main-content {
        padding: 16px;
    }
    
    .actions-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .actions-left, .actions-right {
        width: 100%;
        justify-content: space-between;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .keys-table {
        min-width: 800px;
    }
}