:root {
    --dark-purple: #59359a;
    --plum: #a98eda;
    --light-purple: #e2d9f3;
    --medium-purple: #6f42c1;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: #222; line-height: 1.5; }
main { max-width: 1200px; margin: 0 auto; padding: 20px; }
a { color: var(--medium-purple); }
.banner { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; margin: 40px 0; border-radius: 8px; }
.boxes { display: flex; gap: 20px; flex-wrap: wrap; }
.box { flex: 1 1 200px; background: var(--dark-purple); color: #fff; text-align: center; border-radius: 8px; padding: 16px; }
.box h3 { margin: 0 0 8px; font-size: 18px; padding-bottom: 8px; border-bottom: 1px solid var(--plum); }
.box p { margin: 0; }
.content { margin: 40px 0; }
.organizer { text-align: center; border-top: 1px solid var(--light-purple); padding-top: 30px; margin-top: 40px; }
footer { text-align: center; padding: 20px; font-size: 14px; color: #666; }
footer img { max-height: 20px; vertical-align: middle; }
.summary { background: var(--light-purple); border-radius: 8px; padding: 20px; margin-bottom: 30px; }
.summary dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; }
.summary dt { font-weight: bold; }
.summary dd { margin: 0; }
form label { display: block; margin: 12px 0 4px; font-weight: bold; }
form input[type=text], form input[type=password] { width: 100%; max-width: 480px; padding: 8px; border: 1px solid #bbb; border-radius: 4px; font-size: 16px; }
.btn { display: inline-block; background: var(--dark-purple); color: #fff; border: 0; border-radius: 6px; padding: 10px 24px; font-size: 16px; cursor: pointer; text-decoration: none; margin-top: 16px; }
.btn:hover { background: var(--medium-purple); }
.btn-sm { padding: 4px 10px; font-size: 13px; margin: 0; }
.error { color: #b00020; margin: 4px 0; }
.flash { background: #e6f4ea; border: 1px solid #9ad0a8; padding: 10px; border-radius: 6px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { border: 1px solid #ddd; padding: 6px 8px; text-align: left; vertical-align: top; }
th { background: var(--light-purple); }