:root {
    /* Premium Palette (Dark Mode Default) */
    --bg-app: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-card-hover: rgba(51, 65, 85, 0.8);
    --border-glass: rgba(255, 255, 255, 0.1);

    --primary: #6366f1;
    /* Indigo 500 */
    --primary-glow: rgba(99, 102, 241, 0.3);
    --accent: #ec4899;
    /* Pink 500 */

    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Spacing */
    --rad-sm: 8px;
    --rad-md: 12px;
    --rad-lg: 16px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    overflow-x: hidden;
}

/* Layout */
#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

.center-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80vh;
}

/* Typography */
h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

p {
    color: var(--text-muted);
    line-height: 1.5;
}

/* Components: Glass Card */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--rad-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.glass-card:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Components: Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--rad-sm);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--primary-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Forms */
input,
select,
textarea {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-glass);
    padding: 12px;
    border-radius: var(--rad-sm);
    color: white;
    font-family: inherit;
    margin-bottom: 12px;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

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

.flex {
    display: flex;
    gap: 10px;
}

.flex-col {
    flex-direction: column;
}

.space-between {
    justify-content: space-between;
}

.items-center {
    align-items: center;
}

.mt-4 {
    margin-top: 1rem;
}

.text-sm {
    font-size: 0.875rem;
}

.text-center {
    text-align: center;
}

/* Status Badges */
.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.badge-warn {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    animation: slideUp 0.3s ease-out;
}

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

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.gap-2 {
    gap: 10px;
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    h1 {
        font-size: 1.5rem;
    }

    .glass-card {
        padding: 16px;
    }

    .flex {
        flex-wrap: wrap;
    }

    .btn {
        width: 100%;
    }

    .user-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .role-select {
        width: 100% !important;
    }
}