:root {
    --bg: #f3f4f6; --card: #fff; --text: #111827; --muted: #6b7280; --border: #e5e7eb;
    --primary: #2563eb; --danger: #dc2626; --radius: 10px;
}
* { box-sizing: border-box; }
html { color-scheme: light; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.45; }
a { color: var(--primary); }
h1 { font-size: 26px; margin: 0 0 6px; } h2 { font-size: 18px; margin: 0 0 12px; } h3 { font-size: 16px; }

.topbar { background: #111827; color: #fff; padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.topbar .brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 18px; }
.topbar nav { display: flex; gap: 16px; align-items: center; font-size: 14px; }
.topbar nav a { color: #cbd5e1; }
.topbar nav form { margin: 0; }
.topbar .who { color: #9ca3af; }
.topbar .btn-link { color: #cbd5e1; }
.lang-switch { display: inline-flex; gap: 10px; padding-right: 14px; margin-right: 2px; border-right: 1px solid #374151; }
.lang-switch strong { color: #fff; }

.container { max-width: 1240px; margin: 0 auto; padding: 24px; }
.container.narrow { max-width: 440px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; font-size: 14px; }
.flash-success { background: #dcfce7; color: #14532d; }
.flash-error   { background: #fee2e2; color: #7f1d1d; }
.flash-info    { background: #dbeafe; color: #1e3a8a; }

label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: #374151; }
.hint { font-size: 12px; font-weight: 400; color: var(--muted); }
input[type=text], input[type=email], input[type=password], input[type=number], select {
    width: 100%; padding: 8px 10px; border: 1px solid #cbd5e1; border-radius: 6px; font: inherit; background: #fff; color: var(--text);
}
input[type=file] { width: 100%; font-size: 13px; }
.field { margin-bottom: 12px; }
.field-inline { display: flex; align-items: end; padding-bottom: 6px; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 400; font-size: 14px; margin: 0; }
.check input { width: auto; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px 16px; align-items: start; }
.form-grid .span-2 { grid-column: 1 / -1; }
.form-actions { display: flex; align-items: center; gap: 12px; }

.btn { display: inline-block; padding: 8px 14px; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff; color: var(--text); font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; line-height: 1.3; }
.btn:hover { background: #f9fafb; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: #1d4ed8; }
.btn-danger { color: var(--danger); border-color: #fca5a5; }
.btn-link { border: none; background: none; color: var(--primary); padding: 0; font-weight: 400; }

.page-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.page-header .actions { display: flex; gap: 8px; flex-wrap: wrap; }
.muted { color: var(--muted); font-size: 14px; }

details.settings summary { cursor: pointer; font-weight: 700; font-size: 16px; }
details.settings[open] summary { margin-bottom: 14px; }
.danger-zone { margin-top: 16px; padding-top: 12px; border-top: 1px dashed var(--border); }

.cal-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.cal-item h3 { margin: 0 0 4px; }
.cal-item .actions { display: flex; gap: 8px; margin-top: 12px; }

.month-card { padding: 0; overflow: hidden; }
.month-card-head { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; border-bottom: 1px solid var(--border); background: #fafafa; }
.month-card-head h2 { margin: 0; }
.month-num { display: inline-block; min-width: 26px; text-align: center; background: #111827; color: #fff; border-radius: 6px; font-size: 13px; padding: 2px 6px; margin-right: 6px; vertical-align: 2px; }
.month-card-body { display: grid; grid-template-columns: 320px 1fr; gap: 24px; padding: 20px; }
@media (max-width: 860px) { .month-card-body { grid-template-columns: 1fr; } }

.preview-wrap { width: 100%; aspect-ratio: 210 / 297; overflow: hidden; border: 1px solid var(--border); background: #e5e7eb; position: relative; }
.preview-wrap.paper-letter { aspect-ratio: 8.5 / 11; }
.preview-wrap.paper-a3 { aspect-ratio: 297 / 420; }
.preview-wrap .page { position: absolute; top: 0; left: 0; transform-origin: top left; pointer-events: none; }

fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px 4px; margin: 0 0 14px; min-width: 0; }
legend { font-weight: 700; font-size: 13px; padding: 0 6px; }
.badge { font-size: 11px; background: #fef3c7; color: #92400e; padding: 3px 9px; border-radius: 999px; font-weight: 600; }
.inline-error { color: var(--danger); font-size: 13px; margin-top: 4px; }