:root {
  --bg: #f6f7f9; --panel: #fff; --line: #d9dde3; --text: #1f2933; --muted: #6b7280;
  --accent: #1d4ed8; --danger: #dc2626; --danger-bg: #fee2e2;
  --hour-h: 44px;
}
* { box-sizing: border-box; }
body { margin: 0; font: 14px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); background: var(--bg); }
.top { display: flex; align-items: center; gap: 24px; padding: 10px 20px; background: var(--panel); border-bottom: 1px solid var(--line); }
.top h1 { margin: 0; font-size: 18px; }
.top .sub { font-weight: normal; color: var(--muted); font-size: 13px; margin-left: 6px; }
.tabs button { background: none; border: none; padding: 8px 12px; font: inherit; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; }
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); }
main { padding: 14px 20px; }
.view { display: none; }
.view.active { display: block; }
.controls { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin-bottom: 12px; }
.controls label { display: flex; flex-direction: column; font-size: 12px; color: var(--muted); gap: 2px; }
.controls label.chk { flex-direction: row; align-items: center; gap: 6px; color: var(--text); font-size: 13px; }
select, input, button { font: inherit; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); }
button { cursor: pointer; }
button:hover { border-color: var(--accent); }
.info { color: var(--muted); font-size: 13px; }

/* Rejilla horaria */
.grid-wrap { overflow-x: auto; }
.grid { display: grid; grid-template-columns: 56px repeat(5, minmax(150px, 1fr)); border: 1px solid var(--line); background: var(--panel); border-radius: 8px; overflow: hidden; min-width: 820px; }
.grid .head { padding: 6px; text-align: center; font-weight: 600; border-bottom: 1px solid var(--line); border-left: 1px solid var(--line); background: #f0f2f5; }
.grid .head:first-child { border-left: none; }
.grid .hours { position: relative; border-right: 1px solid var(--line); }
.grid .hours div { height: var(--hour-h); font-size: 11px; color: var(--muted); text-align: right; padding: 2px 6px 0 0; border-top: 1px solid var(--line); }
.grid .day { position: relative; border-left: 1px solid var(--line); background:
  repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--hour-h) - 1px), var(--line) calc(var(--hour-h) - 1px), var(--line) var(--hour-h)); }
.ses { position: absolute; padding: 3px 5px; font-size: 11px; line-height: 1.25; overflow: hidden; border-radius: 5px; border: 1px solid rgba(0,0,0,.15); cursor: default; }
.ses b { display: block; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ses small { color: #333; }
.ses.pequeno { border-style: dashed; }
.ses.solape { outline: 2px solid var(--danger); outline-offset: -2px; }
.empty { padding: 30px; color: var(--muted); text-align: center; }

/* Perfiles */
.perfil-layout { display: grid; grid-template-columns: 340px 1fr; gap: 16px; align-items: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.panel h2 { margin: 0 0 8px; font-size: 15px; }
.panel h3 { margin: 14px 0 6px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.panel .row { display: flex; gap: 6px; margin-bottom: 6px; }
.panel .row > * { flex: 1; min-width: 0; }
.panel .row > button[title] { flex: 0 0 auto; }
.panel input#p-buscar { width: 100%; }
.lista { max-height: 260px; overflow-y: auto; border: 1px solid var(--line); border-radius: 6px; margin-top: 6px; }
.lista .item { display: flex; gap: 8px; align-items: center; padding: 5px 8px; border-bottom: 1px solid #eef0f3; font-size: 12px; cursor: pointer; }
.lista .item:hover { background: #f3f6ff; }
.lista .item .sw { width: 10px; height: 10px; border-radius: 3px; flex: 0 0 auto; }
.lista .item .txt { flex: 1; min-width: 0; }
.lista .item .meta { color: var(--muted); font-size: 11px; }
.lista .item button { padding: 1px 6px; font-size: 11px; }
.solapes { margin-top: 10px; font-size: 12px; }
.solapes .s { background: var(--danger-bg); border-left: 3px solid var(--danger); padding: 4px 8px; margin-bottom: 4px; border-radius: 4px; }
.solapes .ok { color: #15803d; }

.tooltip { position: fixed; z-index: 10; background: #111827; color: #fff; padding: 8px 10px; border-radius: 6px; font-size: 12px; max-width: 320px; pointer-events: none; box-shadow: 0 4px 16px rgba(0,0,0,.25); }
.tooltip div { margin: 1px 0; }

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

/* Vista estudiante */
.lista.alta { max-height: 60vh; }
.lista .curso { padding: 4px 8px; background: #f0f2f5; font-size: 11px; font-weight: 600; color: var(--muted); position: sticky; top: 0; }
.lista .asig { display: grid; grid-template-columns: 1fr; gap: 4px; padding: 6px 8px; border-bottom: 1px solid #eef0f3; font-size: 12px; }
.lista .asig .nombre { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.lista .asig .grupos { display: flex; gap: 6px; padding-left: 22px; }
.lista .asig .grupos select { padding: 2px 4px; font-size: 11px; flex: 1; min-width: 0; }
.lista .asig.off .grupos { display: none; }
.lista .asig .sw { width: 10px; height: 10px; border-radius: 3px; flex: 0 0 auto; }
.lista .asig .info { margin-left: auto; border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 14px; padding: 0 2px; }
.lista .asig .info:hover { color: #111827; }
.lista .asig .detalle { padding-left: 22px; color: var(--muted); font-size: 11px; line-height: 1.5; }
.lista .asig .detalle a { color: #1d4ed8; }

.pie { padding: 8px 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 1.6; }
.pie a { color: #1d4ed8; }
@media print { .pie { display: none; } }