:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #0f172a; /* Dark Blue */
    --surface-color: #1e293b; /* Lighter Dark Blue */
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #38bdf8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utilities */
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 1rem; }
.p-4 { padding: 1rem; }
.p-8 { padding: 2rem; }
.m-4 { margin: 1rem; }
.mt-4 { margin-top: 1rem; }
.w-full { width: 100%; }
.text-center { text-align: center; }
.text-xl { font-size: 1.25rem; font-weight: bold; }
.text-2xl { font-size: 1.5rem; font-weight: bold; }
.text-accent { color: var(--accent-color); }

/* Glassmorphism Card */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background-color: #334155;
}

/* Inputs */
input, select {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--glass-border);
    background-color: rgba(0, 0, 0, 0.2);
    color: white;
    outline: none;
}

input:focus {
    border-color: var(--accent-color);
}

/* Layout */
header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
}

.logo {
    height: 40px;
    margin-right: 1rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

th {
    color: var(--text-muted);
    font-weight: 600;
}

tr:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal {
    width: 90%;
    max-width: 500px;
}