:root {
    --bg: #0f172a;
    --bg-secondary: #111827;
    --panel: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-dark: #0ea5e9;
    --card: #0f172a;
    --border: rgba(148, 163, 184, 0.18);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, #020617 0%, #0f172a 100%);
    color: var(--text);
    min-height: 100vh;
}

.dashboard {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--bg-secondary);
    padding: 2rem 1.5rem;
    border-right: 1px solid rgba(148, 163, 184, 0.12);
}

.brand {
    font-size: 1.4rem;
    margin-bottom: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar a {
    display: inline-flex;
    padding: 0.9rem 1rem;
    border-radius: 12px;
    color: var(--text);
    text-decoration: none;
    transition: background 0.2s ease;
}

.sidebar a:hover,
.sidebar a.active {
    background: rgba(56, 189, 248, 0.18);
    color: #ffffff;
}

.content {
    padding: 2rem;
}

.panel {
    margin-bottom: 2rem;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(148, 163, 184, 0.12);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25);
}

.panel h1,
.panel h2 {
    margin-bottom: 1rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.card {
    padding: 1.5rem;
    border-radius: 20px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(56, 189, 248, 0.16);
}

.card h2 {
    font-size: 1rem;
    color: var(--text-muted);
}

.card p {
    margin-top: 0.75rem;
    font-size: 2rem;
    font-weight: 700;
}

.form-card {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: rgba(15, 23, 42, 0.7);
    border-radius: 20px;
    border: 1px solid rgba(148, 163, 184, 0.12);
}

.form-card label {
    display: grid;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.form-card input,
.form-card select,
.form-card button {
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.14);
    background: rgba(15, 23, 42, 0.85);
    color: var(--text);
    padding: 0.85rem 1rem;
}

.form-card button {
    cursor: pointer;
    border: none;
    background: var(--accent);
    color: #020617;
    font-weight: 700;
    transition: background 0.2s ease;
}

.form-card button:hover {
    background: var(--accent-dark);
}

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

thead tr {
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

thead th,
tbody td {
    text-align: left;
    padding: 0.95rem 0.75rem;
    font-size: 0.95rem;
}

tbody tr {
    border-bottom: 1px solid rgba(148, 163, 184, 0.08);
}

.alert {
    margin-top: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #a7f3d0;
    border-radius: 14px;
}

@media (max-width: 1100px) {
    .dashboard {
        grid-template-columns: 1fr;
    }

    .cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .sidebar {
        display: none;
    }

    .content {
        padding: 1rem;
    }

    .form-card input,
    .form-card select,
    .form-card button {
        width: 100%;
    }
}