:root {
  --bg: #f6f7f9; --surface: #ffffff; --text: #16181d; --muted: #667085; --border: #e4e7ec;
  --accent: #2f5bea; --accent-ink: #ffffff; --danger: #d92d20;
  --task: #7c3aed; --done: #98a2b3; --holiday: #fde8e7;
  /* paletă categorică (o culoare = o materie), ordine fixă, validată pt. CVD + contrast pe --surface */
  --cat-1: #2a78d6; --cat-2: #1baf7a; --cat-3: #eda100; --cat-4: #008300;
  --cat-5: #4a3aa7; --cat-6: #e34948; --cat-7: #e87ba4; --cat-8: #eb6834; --cat-more: #667085;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --surface: #171a21; --text: #e7e9ee; --muted: #98a2b3; --border: #2a2f3a;
    --accent: #6d8cff; --accent-ink: #0b0d12; --danger: #ff6b5e;
    --task: #9f6bff; --done: #5b6474; --holiday: #3a1f1f;
    --cat-1: #3987e5; --cat-2: #199e70; --cat-3: #c98500; --cat-4: #008300;
    --cat-5: #9085e9; --cat-6: #e66767; --cat-7: #d55181; --cat-8: #d95926; --cat-more: #98a2b3;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
button, input, textarea { font: inherit; color: inherit; }

.brand { font-weight: 650; display: flex; align-items: center; gap: 8px; letter-spacing: -0.01em; }
.brand-dot { width: 10px; height: 10px; border-radius: 3px; background: var(--accent); display: inline-block; }

.btn { border: 1px solid var(--border); background: var(--surface); padding: 7px 12px; border-radius: 8px;
  cursor: pointer; white-space: nowrap; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.btn.wide { width: 100%; padding: 10px; }
.btn:disabled { opacity: .6; cursor: wait; }

/* login */
.login-body { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 28px; }
.login-card h1 { font-size: 20px; margin: 18px 0 14px; }
label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
input, textarea { border: 1px solid var(--border); background: var(--bg); border-radius: 8px; padding: 9px 10px;
  font-size: 15px; width: 100%; }
input:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-color: var(--accent); }
.err { color: var(--danger); font-size: 14px; margin: 0 0 12px; min-height: 0; }
.err:empty { display: none; }

/* layout */
.topbar { display: flex; align-items: center; gap: 16px; padding: 10px 20px; background: var(--surface);
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 5; flex-wrap: wrap; }
.status { color: var(--muted); font-size: 13px; flex: 1; min-width: 200px; }
.status b { color: var(--text); font-weight: 600; }
.status .warn { color: var(--danger); }
.actions { display: flex; gap: 8px; align-items: center; }
.actions form { margin: 0; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 20px; padding: 20px; max-width: 1500px; margin: 0 auto; }
.cal-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; min-width: 0; }
.side { display: grid; gap: 16px; align-content: start; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.panel h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 10px; }
.todo, .changes { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.todo li { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.todo li input { width: auto; margin-top: 3px; }
.todo .when { color: var(--muted); font-size: 12px; display: block; }
.todo .overdue .when { color: var(--danger); }
.changes li { font-size: 13px; border-left: 3px solid var(--border); padding-left: 10px; }
.changes time { color: var(--muted); font-size: 12px; display: block; }
.empty { color: var(--muted); font-size: 13px; }
.legend { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; font-size: 12px; color: var(--muted); padding: 0 4px; }
.legend-group { display: flex; flex-wrap: wrap; gap: 12px; }
.legend-sep { width: 1px; height: 12px; background: var(--border); }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; background: var(--cat-more); }
.sw.task { background: var(--task); }
.ln { display: inline-block; width: 16px; height: 0; border-top: 3px solid var(--muted); margin-right: 5px; vertical-align: 3px; }
.ln.sem { border-top-style: dashed; } .ln.lab { border-top-style: dotted; }

/* dialogs */
dialog { border: 1px solid var(--border); border-radius: 14px; background: var(--surface); color: var(--text);
  padding: 22px; width: min(460px, calc(100vw - 32px)); }
dialog::backdrop { background: rgb(0 0 0 / .35); }
dialog h2 { margin: 0 0 16px; font-size: 18px; }
.row { display: flex; gap: 12px; align-items: end; }
.row > label { flex: 1; }
label.check { display: flex; flex-direction: row; align-items: center; gap: 8px; color: var(--text); font-size: 14px; }
label.check input { width: auto; }
.dlg-actions { display: flex; gap: 8px; margin-top: 8px; align-items: center; }
.spacer { flex: 1; }
.details { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0 0 16px; }
.details dt { color: var(--muted); font-size: 13px; }
.details dd { margin: 0; }

.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 10px 16px; border-radius: 10px; font-size: 14px; z-index: 50; max-width: calc(100vw - 32px); }

/* FullCalendar */
.fc { --fc-border-color: var(--border); --fc-page-bg-color: var(--surface); --fc-neutral-bg-color: var(--bg);
  --fc-today-bg-color: color-mix(in srgb, var(--accent) 7%, transparent); --fc-list-event-hover-bg-color: var(--bg);
  --fc-button-bg-color: var(--surface); --fc-button-border-color: var(--border); --fc-button-text-color: var(--text);
  --fc-button-hover-bg-color: var(--bg); --fc-button-hover-border-color: var(--muted);
  --fc-button-active-bg-color: var(--accent); --fc-button-active-border-color: var(--accent);
  --fc-now-indicator-color: var(--danger); font-size: 14px; }
.fc .fc-button-primary:not(:disabled).fc-button-active { color: var(--accent-ink); }
.fc .fc-toolbar-title { font-size: 18px; font-weight: 650; }
.fc .fc-button { font-size: 13px; padding: 5px 10px; text-transform: none; box-shadow: none !important; }
.fc-event { cursor: pointer; }
/* --c e setat per eveniment în JS (culoare = materie); tipul (curs/sem/lab) e codat prin stilul liniei, nu prin culoare */
.fc .ev { --c: var(--accent); }
.fc .ev-task { --c: var(--task); } .fc .ev-done { --c: var(--done); }
.fc .fc-timegrid-event.ev, .fc .fc-daygrid-block-event.ev { background: color-mix(in srgb, var(--c) 16%, var(--surface));
  border: 0; border-left-width: 4px; border-left-color: var(--c); border-left-style: solid; color: var(--text); }
.fc .fc-timegrid-event.ev-sem, .fc .fc-daygrid-block-event.ev-sem { border-left-style: dashed; }
.fc .fc-timegrid-event.ev-lab, .fc .fc-daygrid-block-event.ev-lab { border-left-style: dotted; }
.fc .fc-timegrid-event.ev .fc-event-main, .fc .fc-daygrid-block-event.ev .fc-event-main { color: var(--text); }
.fc .fc-daygrid-dot-event.ev .fc-daygrid-event-dot, .fc .fc-list-event.ev .fc-list-event-dot { border-color: var(--c); }
.fc .ev-done .fc-event-title, .fc .ev-done .fc-list-event-title { text-decoration: line-through; opacity: .75; }
.fc .ev-holiday { background: var(--holiday); border: 0; color: var(--text); }
.fc .ev-room { font-size: 12px; opacity: .8; }
.fc .ev-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.ev-badge { flex: none; font-size: 9px; font-weight: 700; line-height: 1.4; padding: 1px 5px; border-radius: 6px;
  background: color-mix(in srgb, var(--text) 14%, transparent); color: var(--text); letter-spacing: .02em; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 12px; gap: 12px; }
  .topbar { padding: 10px 16px; gap: 8px; }
  .status { order: 3; flex-basis: 100%; }
  .cal-wrap { padding: 8px; }
  .fc .fc-toolbar { flex-wrap: wrap; gap: 8px; }
  .fc .fc-toolbar-title { font-size: 16px; }
}
.fc .fc-timegrid-event .fc-event-main { overflow: hidden; }