* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f4f1ec; color: #222; line-height: 1.5; }
header { background: #0d2137; color: #fff; padding: 14px 24px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 700; font-size: 18px; }
.user-badge { font-size: 14px; background: #1a3a5c; padding: 6px 14px; border-radius: 20px; }
main { max-width: 640px; margin: 32px auto; padding: 0 16px; }
.card { background: #fff; border-radius: 12px; padding: 32px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); margin-bottom: 20px; }
.card h1 { font-size: 24px; margin-bottom: 12px; }
.card h2 { font-size: 20px; margin-bottom: 12px; }
.card p { color: #555; margin-bottom: 16px; }
.hint { font-size: 13px; color: #888; margin-top: 12px; }
.btn-primary { display: inline-block; background: #e60023; color: #fff; border: none; padding: 12px 28px; font-size: 16px; font-weight: 600; border-radius: 24px; cursor: pointer; text-decoration: none; }
.btn-primary:hover { background: #c8001f; }
.btn-primary:disabled { background: #ccc; cursor: not-allowed; }
.btn-secondary { background: #efefef; color: #222; border: none; padding: 10px 20px; font-size: 14px; font-weight: 600; border-radius: 20px; cursor: pointer; }
.btn-secondary:hover { background: #ddd; }
.hidden { display: none !important; }
.board-list { display: grid; gap: 8px; margin-bottom: 16px; max-height: 300px; overflow-y: auto; }
.board-item { padding: 12px 16px; border: 2px solid #eee; border-radius: 8px; cursor: pointer; }
.board-item:hover { border-color: #ccc; }
.board-item.selected { border-color: #e60023; background: #fff5f5; }
.create-board { display: flex; gap: 8px; margin-bottom: 16px; }
.create-board input { flex: 1; padding: 10px 14px; border: 2px solid #eee; border-radius: 8px; font-size: 14px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 10px 14px; border: 2px solid #eee; border-radius: 8px; font-size: 14px; }
.form-group textarea { resize: vertical; }
.selected-board { padding: 10px 14px; background: #f7f7f7; border-radius: 8px; font-weight: 600; }
.image-preview { margin-top: 8px; }
.image-preview img { max-width: 200px; border-radius: 8px; }
.status { margin-top: 12px; font-size: 14px; }
.status.error { color: #c8001f; }
.status.loading { color: #666; }
footer { text-align: center; padding: 24px; color: #888; font-size: 13px; }
footer a { color: #666; }