body {
    font-family: system-ui, sans-serif;
    max-width: 720px;
    margin: 40px auto;
    padding: 0 16px;
    color: #222;
    background: #fafafa;
}

h1 {
    font-size: 1.5rem;
}

nav a {
    margin-right: 12px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: #fff;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
}

label {
    font-weight: 600;
    font-size: 0.9rem;
}

input, textarea, select {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    padding: 10px;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

button.secondary {
    background: #6b7280;
}

button.secondary:hover {
    background: #4b5563;
}

button.danger {
    background: #dc2626;
}

button.danger:hover {
    background: #b91c1c;
}

.error {
    color: #b91c1c;
    background: #fee2e2;
    padding: 8px 12px;
    border-radius: 4px;
}

.success {
    color: #166534;
    background: #dcfce7;
    padding: 8px 12px;
    border-radius: 4px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    margin-bottom: 24px;
}

th, td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid #eee;
}

.session-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.session-box {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
}

.session-box.checked {
    background: #16a34a;
}

.session-box.missing {
    background: #9ca3af;
}

.session-table {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    overflow: hidden;
}

.session-table-header,
.session-row {
    display: grid;
    grid-template-columns: 56px 88px 96px 1fr 88px;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
}

.session-table-header {
    font-weight: 600;
    font-size: 0.85rem;
    background: #f3f4f6;
    border-bottom: 1px solid #e5e7eb;
}

.session-row {
    background: none;
    box-shadow: none;
    border-radius: 0;
    border-bottom: 1px solid #eee;
    margin-bottom: 0;
}

.session-row:last-child {
    border-bottom: none;
}

.session-cancelled {
    background: #e5e7eb;
    color: #6b7280;
}

.progress {
    font-weight: 600;
    margin-bottom: 8px;
}

.card {
    background: #fff;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
}

.feature-links a {
    display: block;
    margin-bottom: 8px;
}