:root {
    --bg-main: #111827;
    --bg-card: #1f2937;
    --bg-card-header: #374151;
    --text-main: #f9fafb;
    --text-muted: #9ca3af;
    --accent: #0ea5e9;
    --success: #10b981;
    --danger: #ef4444;
    --border: #374151;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    line-height: 1.5;
}

.navbar {
    background-color: var(--bg-card);
    padding: 0.75rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--accent);
    letter-spacing: -0.025em;
}

.container {
    max-width: 1100px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

.card {
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: var(--bg-card-header);
    padding: 1rem 1.5rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body {
    padding: 1.5rem;
}

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

th {
    text-align: left;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.9375rem;
}

tr:last-child td { border-bottom: none; }

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    border: 1px solid transparent;
}

.btn-primary { background-color: var(--accent); color: white; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

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

.status-badge {
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.status-active { background-color: rgba(16, 185, 129, 0.2); color: #34d399; }
.status-expired { background-color: rgba(239, 68, 68, 0.2); color: #f87171; }

.form-control {
    background-color: var(--bg-main);
    border: 1px solid var(--border);
    color: white;
    padding: 0.625rem;
    border-radius: 6px;
    width: 100%;
    box-sizing: border-box;
}
.form-control:focus { outline: 2px solid var(--accent); border-color: transparent; }