:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1b1f2a;
  --muted: #5b6272;
  --line: #dfe3ec;
  --accent: #4f46e5;
  --accent-text: #ffffff;
  --warn: #b45309;
  --err: #b91c1c;
  --ok: #15803d;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 4px 14px rgba(20, 24, 40, .06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1220;
    --surface: #181c2e;
    --text: #eef0f7;
    --muted: #a3a9bd;
    --line: #2b3150;
    --accent: #8b87ff;
    --accent-text: #0f1220;
    --warn: #fbbf24;
    --err: #f87171;
    --ok: #4ade80;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

/* Header */
.top {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.titles h1 { margin: 0; font-size: 1.6rem; line-height: 1.15; }
.titles p { margin: 2px 0 0; color: var(--muted); }
.clock { text-align: right; }
#clockDate { color: var(--muted); font-size: .95rem; }
#clockTime { font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.top-actions { display: flex; gap: 8px; }

.btn {
  font: inherit;
  border-radius: 10px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn:hover { filter: brightness(.96); }

main { max-width: 1280px; margin: 0 auto; padding: 16px 20px 40px; }

/* Now / Next */
.status { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; margin-bottom: 18px; }
.status-card {
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-left: 8px solid var(--c, var(--line));
}
.status-card .label { font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
.status-card h2 { margin: 4px 0 2px; font-size: 1.6rem; line-height: 1.15; }
.status-card .meta { color: var(--muted); }
.status-card .note { margin-top: 6px; font-weight: 600; }
.progress { height: 10px; border-radius: 99px; background: var(--line); overflow: hidden; margin-top: 12px; }
.progress > span { display: block; height: 100%; background: var(--c, var(--accent)); }
.status-card.idle h2 { font-size: 1.25rem; }

/* Controls */
.controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 12px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--surface); }
.seg button { font: inherit; border: 0; background: transparent; color: var(--text); padding: 8px 14px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-selected="true"], .seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.daynav { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.daychip {
  font: inherit; cursor: pointer; padding: 6px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text); text-align: center; line-height: 1.2;
}
.daychip small { display: block; color: var(--muted); font-size: .75rem; }
.daychip[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 2px var(--accent); }
.daychip.today { font-weight: 700; }
.week-note { margin: 0 0 10px; color: var(--warn); font-size: .9rem; }

/* Day view */
.day-title { margin: 6px 0 12px; font-size: 1.3rem; }
.slots { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.slot { display: grid; grid-template-columns: 92px 1fr; gap: 12px; align-items: stretch; }
.slot-time { text-align: right; color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; padding-top: 12px; }
.slot-time b { color: var(--text); display: block; }
.slot.past { opacity: .5; }
.slot.now .lesson-card { outline: 4px solid var(--accent); outline-offset: 2px; }
.lesson-card {
  font: inherit; text-align: left; width: 100%; cursor: pointer; border: 0;
  background: var(--bg-c); color: var(--fg-c);
  border-radius: var(--radius); padding: 12px 16px; box-shadow: var(--shadow);
}
.lesson-card h3 { margin: 0; font-size: 1.2rem; }
.lesson-card p { margin: 2px 0 0; opacity: .92; }
.lesson-card .note { font-weight: 700; margin-top: 6px; }
.lesson-card.compact { padding: 8px 16px; }
.lesson-card.compact h3 { font-size: 1.05rem; }
.empty { padding: 28px; text-align: center; color: var(--muted); background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); }

/* Week grid */
.week-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow-x: auto; }
.week { display: grid; min-width: 640px; }
.week-head { display: grid; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--surface); }
.week-head > div { padding: 10px 6px; text-align: center; font-weight: 600; border-left: 1px solid var(--line); }
.week-head > div:first-child { border-left: 0; }
.week-head small { display: block; color: var(--muted); font-weight: 400; }
.week-head .today { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.week-body { display: grid; position: relative; }
.axis { position: relative; }
.axis span { position: absolute; right: 8px; transform: translateY(-50%); font-size: .75rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.col { position: relative; border-left: 1px solid var(--line);
  background-image: repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--hour) - 1px), var(--line) calc(var(--hour) - 1px), var(--line) var(--hour)); }
.col.today { background-color: color-mix(in srgb, var(--accent) 7%, transparent); }
.wl {
  position: absolute; left: 3px; right: 3px; overflow: hidden; border: 0; border-radius: 8px; padding: 3px 7px;
  font: inherit; font-size: .82rem; line-height: 1.25; text-align: left; cursor: pointer;
  background: var(--bg-c); color: var(--fg-c);
}
.wl b { display: block; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.wl span { display: block; opacity: .92; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.wl.tiny { padding: 0 7px; font-size: .75rem; }
.wl.tiny span { display: none; }
.wl.now { outline: 3px solid var(--text); outline-offset: -3px; z-index: 2; }
.nowline { position: absolute; left: 0; right: 0; height: 0; border-top: 2px solid #ef4444; z-index: 3; pointer-events: none; }

/* Pack box */
.pack { margin-top: 18px; }
.pack-card { background: var(--surface); border: 1px solid var(--line); border-left: 8px solid var(--warn); border-radius: var(--radius); padding: 12px 18px; }
.pack-card h2 { margin: 0 0 6px; font-size: 1.05rem; }
.pack-card ul { margin: 0; padding-left: 20px; }

/* Dialogs */
dialog { border: 0; border-radius: var(--radius); padding: 22px; max-width: min(560px, 92vw); width: 100%; background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(10, 12, 24, .5); }
dialog h2 { margin-top: 0; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.dlg-actions.spread { justify-content: space-between; flex-wrap: wrap; }
.detail-head { border-radius: 10px; padding: 14px 16px; background: var(--bg-c); color: var(--fg-c); }
.detail-head h2 { margin: 0; }
.detail-head p { margin: 2px 0 0; }
dl.detail { display: grid; grid-template-columns: 110px 1fr; gap: 6px 12px; margin: 14px 0 0; }
dl.detail dt { color: var(--muted); }
dl.detail dd { margin: 0; }

.dropzone { display: grid; gap: 4px; justify-items: center; text-align: center; padding: 28px 16px; border: 2px dashed var(--line); border-radius: var(--radius); cursor: pointer; }
.dropzone.over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.dropzone span { color: var(--muted); }
.msgs { margin-top: 12px; max-height: 220px; overflow: auto; }
.msgs p { margin: 4px 0; font-size: .92rem; }
.msgs .ok { color: var(--ok); font-weight: 600; }
.msgs .err { color: var(--err); }
.msgs .warn { color: var(--warn); }
.muted { color: var(--muted); font-size: .9rem; }

/* Narrow screens */
@media (max-width: 720px) {
  .top { grid-template-columns: 1fr auto; padding: 12px 16px; }
  .top-actions { grid-column: 1 / -1; }
  .titles h1 { font-size: 1.35rem; }
  main { padding: 12px 16px 32px; }
  .slot { grid-template-columns: 70px 1fr; gap: 8px; }
  .daynav { order: 3; flex-basis: 100%; }
  .daychip { flex: 1; padding: 6px 4px; }
}

/* Print: weekly grid on A4 landscape */
@page { size: A4 landscape; margin: 10mm; }
@media print {
  body { background: #fff; color: #000; }
  .top-actions, .controls, .status, .pack, .skip, .week-note, .nowline { display: none !important; }
  .top { border: 0; padding: 0 0 8px; }
  main { padding: 0; max-width: none; }
  .week-wrap { box-shadow: none; overflow: visible; }
  .week { min-width: 0; }
  .wl, .lesson-card { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}