* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #050816;
    color: #e5e7eb;
}

a {
    color: #a5b4fc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 24px;
    background: #020617;
    border-bottom: 1px solid #1f2933;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-weight: 700;
    color: #e5e7eb;
}

.topbar-nav a {
    margin-left: 12px;
    font-size: 14px;
}

.container {
    max-width: 1100px;
    margin: 24px auto;
    padding: 0 16px;
}

h1, h2, h3 {
    color: #f9fafb;
}

.card {
    background: #020617;
    border-radius: 12px;
    padding: 16px 18px;
    border: 1px solid #1f2933;
    margin-bottom: 12px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.two-columns {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.2fr);
    gap: 16px;
}

@media (max-width: 900px) {
    .two-columns {
        grid-template-columns: 1fr;
    }
}

.btn {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #4f46e5, #22c55e);
    color: white;
    font-size: 14px;
    margin-top: 6px;
}

.btn:hover {
    filter: brightness(1.05);
}

.btn-outline {
    background: transparent;
    border: 1px solid #4f46e5;
}

.form label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
}

input[type="text"],
input[type="password"],
input[type="datetime-local"],
textarea,
select {
    width: 100%;
    padding: 6px 8px;
    margin-top: 4px;
    border-radius: 8px;
    border: 1px solid #1f2933;
    background: #020617;
    color: #e5e7eb;
}

textarea {
    resize: vertical;
}

.alert {
    background: #7f1d1d;
    color: #fecaca;
    padding: 8px 10px;
    border-radius: 8px;
    margin-bottom: 12px;
    font-size: 14px;
}

.list {
    list-style: none;
    padding-left: 0;
}

.small {
    font-size: 13px;
}

.muted {
    color: #9ca3af;
}

.deadline {
    font-weight: 500;
}

.deadline.overdue {
    color: #f97373;
}

.status {
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    display: inline-block;
    margin-top: 4px;
}

.status.ok {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid #22c55e;
    color: #bbf7d0;
}

.status.late {
    background: rgba(234, 179, 8, 0.15);
    border: 1px solid #eab308;
    color: #facc15;
}

.status.pending {
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid #3b82f6;
    color: #bfdbfe;
}

.status.overdue {
    background: rgba(248, 113, 113, 0.15);
    border: 1px solid #f97373;
    color: #fecaca;
}

.file-preview {
    width: 100%;
    height: 480px;
    border: none;
    margin-top: 10px;
    border-radius: 12px;
    background: #020617;
}

.image-preview {
    max-width: 100%;
    border-radius: 12px;
    margin-top: 10px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
    font-size: 14px;
}

.table th,
.table td {
    border: 1px solid #1f2933;
    padding: 6px 8px;
}

.table th {
    background: #020617;
}

.filters label {
    display: inline-block;
    margin-right: 10px;
    margin-bottom: 6px;
}

.badge {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 999px;
    font-size: 11px;
    background: rgba(34, 197, 94, 0.2);
    color: #bbf7d0;
    margin-left: 4px;
}

.badge.wrong {
    background: rgba(248, 113, 113, 0.2);
    color: #fecaca;
}

.correct-option {
    color: #bbf7d0;
}

.questions-list {
    padding-left: 18px;
}

.q-correct {
    border-left: 3px solid #22c55e;
    padding-left: 8px;
}

.q-wrong {
    border-left: 3px solid #f97373;
    padding-left: 8px;
}

.btn-row .btn {
    margin-right: 6px;
}