/* ClashFree Timetables: one stylesheet, light and dark, plus print. */

:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #17202e;
  --muted: #5b6575;
  --line: #dde1e7;
  --line-strong: #c5cbd4;
  --brand: #2456d6;
  --brand-text: #ffffff;
  --brand-soft: #e7eeff;
  --ok: #137a3f;
  --ok-soft: #e3f5ea;
  --warn: #8a5a00;
  --warn-soft: #fff3d6;
  --bad: #b42318;
  --bad-soft: #fde8e6;
  --lesson-l: 93%;
  --lesson-s: 70%;
  --lesson-edge-l: 42%;
  --radius: 10px;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 1px 3px rgb(16 24 40 / 8%);
  accent-color: var(--brand);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420;
    --surface: #171d2b;
    --surface-2: #1e2535;
    --text: #e8ecf3;
    --muted: #9aa4b5;
    --line: #2a3345;
    --line-strong: #3a4458;
    --brand: #7aa2ff;
    --brand-text: #0b1530;
    --brand-soft: #1d2a4d;
    --ok: #5fd08f;
    --ok-soft: #123222;
    --warn: #f2c063;
    --warn-soft: #3a2d0e;
    --bad: #ff8a80;
    --bad-soft: #3d1715;
    --lesson-l: 24%;
    --lesson-s: 38%;
    --lesson-edge-l: 62%;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
h1 { font-size: 1.45rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 .75rem; }
a { color: var(--brand); }
.muted { color: var(--muted); }
.small { font-size: .86rem; }
.nowrap { white-space: nowrap; }
[hidden] { display: none !important; }

/* ---------- top bar and steps ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: .6rem 1.25rem; background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .6rem; }
.brand strong { font-size: 1.1rem; letter-spacing: -.01em; margin-right: .5rem; }
.logo { width: 28px; height: 28px; border-radius: 7px; background: var(--brand); position: relative; flex: none;
  background-image: linear-gradient(var(--brand-text), var(--brand-text)), linear-gradient(var(--brand-text), var(--brand-text)),
    linear-gradient(var(--brand-text), var(--brand-text)), linear-gradient(var(--brand-text), var(--brand-text));
  background-size: 18px 2px, 18px 2px, 2px 18px, 2px 18px; background-repeat: no-repeat;
  background-position: 5px 10px, 5px 16px, 11px 5px, 17px 5px; }
.college-name { color: var(--muted); font-size: .92rem; }
.topbar-actions { display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; }
.save-state { color: var(--muted); font-size: .82rem; margin-right: .4rem; }

.steps {
  display: flex; gap: .25rem; padding: .5rem 1.25rem; background: var(--surface); border-bottom: 1px solid var(--line);
  overflow-x: auto; scrollbar-width: thin; position: sticky; top: 0; z-index: 5;
}
.step {
  display: inline-flex; align-items: center; gap: .45rem; padding: .45rem .8rem; border-radius: 999px; border: 1px solid transparent;
  background: none; color: var(--muted); font: inherit; font-size: .92rem; cursor: pointer; white-space: nowrap;
}
.step:hover { background: var(--surface-2); color: var(--text); }
.step[aria-current="page"] { background: var(--brand-soft); color: var(--brand); border-color: color-mix(in srgb, var(--brand) 30%, transparent); font-weight: 600; }
.step .num { display: inline-grid; place-items: center; width: 1.35rem; height: 1.35rem; border-radius: 50%; font-size: .75rem;
  background: var(--surface-2); color: var(--muted); font-weight: 600; }
.step[aria-current="page"] .num { background: var(--brand); color: var(--brand-text); }
.step .count { font-size: .75rem; color: var(--muted); font-weight: 500; }
.step.done .num { background: var(--ok-soft); color: var(--ok); }

main { flex: 1; width: 100%; max-width: 1280px; margin: 0 auto; padding: 1.25rem; outline: none; }

/* ---------- building blocks ---------- */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; box-shadow: var(--shadow); margin-bottom: 1rem; }
.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.page-head p { color: var(--muted); max-width: 70ch; margin: 0; }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1rem; }
.spacer { flex: 1; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem; padding: .5rem .9rem; border-radius: 8px;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--text); font: inherit; font-size: .92rem;
  cursor: pointer; white-space: nowrap; text-decoration: none;
}
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-text); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { padding: .75rem 1.4rem; font-size: 1.02rem; }
.btn.ghost { border-color: transparent; background: none; }
.btn.ghost:hover { background: var(--surface-2); }
.btn.danger { color: var(--bad); }
.btn.icon { padding: .3rem .5rem; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
:where(button, input, select, textarea, a, [tabindex]):focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

input, select, textarea {
  font: inherit; font-size: .92rem; color: var(--text); background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: 7px; padding: .38rem .5rem; min-width: 0;
}
textarea { width: 100%; min-height: 10rem; font-family: ui-monospace, Consolas, monospace; font-size: .85rem; }
input[type="number"] { width: 5.2rem; }
input[type="time"] { width: 7.2rem; }
label.field { display: grid; gap: .25rem; font-size: .86rem; color: var(--muted); }
label.field > input, label.field > select { color: var(--text); }
.check { display: inline-flex; align-items: center; gap: .35rem; font-size: .92rem; cursor: pointer; }

.pill { display: inline-flex; align-items: center; gap: .3rem; padding: .12rem .55rem; border-radius: 999px; font-size: .78rem; font-weight: 600; background: var(--surface-2); color: var(--muted); }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }

.notice { border-radius: 8px; padding: .7rem .9rem; margin-bottom: .75rem; border: 1px solid transparent; }
.notice.ok { background: var(--ok-soft); color: var(--ok); }
.notice.warn { background: var(--warn-soft); color: var(--warn); }
.notice.bad { background: var(--bad-soft); color: var(--bad); }
.notice.info { background: var(--brand-soft); color: var(--text); }
.notice ul { margin: .35rem 0 0; padding-left: 1.2rem; }
.notice li { margin: .2rem 0; }

/* ---------- editable tables ---------- */
.table-wrap { overflow: auto; max-width: 100%; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table.edit { border-collapse: separate; border-spacing: 0; width: 100%; font-size: .92rem; }
table.edit th, table.edit td { padding: .35rem .5rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
table.edit thead th { position: sticky; top: 0; background: var(--surface-2); font-size: .8rem; color: var(--muted); font-weight: 600; z-index: 1; white-space: nowrap; }
table.edit tbody tr:last-child td { border-bottom: none; }
table.edit tbody tr:hover td { background: color-mix(in srgb, var(--surface-2) 60%, transparent); }
table.edit td input:not([type="number"]):not([type="checkbox"]), table.edit td select { width: 100%; min-width: 8rem; }
table.edit td.narrow { width: 1%; }
table.edit td.narrow input:not([type="number"]) { width: 5.6rem; min-width: 0; }
table.edit td.wide { min-width: 15rem; }
table.edit .empty td { text-align: center; color: var(--muted); padding: 1.5rem; }
.table-foot { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; margin-top: .75rem; }

/* ---------- metrics ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .75rem; margin-bottom: 1rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: .8rem 1rem; }
.stat .label { font-size: .8rem; color: var(--muted); }
.stat .value { font-size: 1.6rem; font-weight: 700; letter-spacing: -.02em; }
.stat .value.ok { color: var(--ok); }
.stat .value.bad { color: var(--bad); }
.stat .sub { font-size: .8rem; color: var(--muted); }

.bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; min-width: 80px; }
.bar > span { display: block; height: 100%; background: var(--brand); border-radius: 99px; }
.bar.hot > span { background: var(--warn); }

/* ---------- timetable grid ---------- */
.tt-toolbar { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; margin-bottom: .9rem; }
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; background: var(--surface); color: var(--text); font: inherit; font-size: .9rem; padding: .45rem .8rem; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line-strong); }
.seg button[aria-pressed="true"] { background: var(--brand); color: var(--brand-text); font-weight: 600; }

.tt-sheet { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow); }
.tt-title { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: .6rem; }
.tt-title h2 { margin: 0; font-size: 1.2rem; }
.tt-scroll { overflow-x: auto; }
table.tt { border-collapse: separate; border-spacing: 3px; width: 100%; table-layout: fixed; min-width: 760px; }
table.tt th { font-size: .78rem; color: var(--muted); font-weight: 600; padding: .3rem .2rem; text-align: center; }
table.tt th .time { display: block; font-weight: 400; font-size: .72rem; }
table.tt th.day { width: 3.6rem; text-align: left; color: var(--text); font-size: .85rem; }
table.tt th.brk, table.tt td.brk { width: 1.6rem; padding: 0; }
table.tt td.brk { background: repeating-linear-gradient(135deg, var(--surface-2) 0 6px, transparent 6px 12px); border-radius: 6px; }
table.tt td.brk span { writing-mode: vertical-rl; transform: rotate(180deg); font-size: .65rem; color: var(--muted); letter-spacing: .1em; display: block; margin: auto; text-align: center; }
table.tt td.slot { background: var(--surface-2); border-radius: 7px; height: 4.6rem; vertical-align: top; padding: 0; position: relative; }
table.tt td.slot.drop-ok { background: var(--ok-soft); outline: 2px dashed var(--ok); outline-offset: -2px; cursor: pointer; }
table.tt td.slot.drop-no { background: color-mix(in srgb, var(--bad-soft) 55%, var(--surface-2)); }
table.tt td.slot.drop-hover { outline: 3px solid var(--ok); }
.cell-stack { display: flex; flex-direction: column; gap: 3px; height: 100%; padding: 0; }

.lesson {
  --h: 210;
  display: flex; flex-direction: column; justify-content: center; gap: 1px; flex: 1; min-height: 0;
  background: hsl(var(--h) var(--lesson-s) var(--lesson-l)); border-left: 4px solid hsl(var(--h) 60% var(--lesson-edge-l));
  border-radius: 7px; padding: .3rem .45rem; font-size: .78rem; line-height: 1.2; color: var(--text); cursor: grab;
  overflow: hidden; text-align: left; border-top: 0; border-right: 0; border-bottom: 0; font-family: inherit; width: 100%;
}
.lesson:hover { filter: brightness(.97); }
.lesson .code { font-weight: 700; font-size: .82rem; display: flex; justify-content: space-between; gap: .3rem; }
.lesson .nm { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lesson .meta { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: .72rem; }
.lesson.compact { padding: .15rem .4rem; }
.lesson.compact .nm { display: none; }
.lesson.selected { outline: 3px solid var(--brand); outline-offset: 1px; }
.lesson.locked .code::after { content: "🔒"; font-size: .7rem; }
.lesson.flash { animation: flash 1.2s ease-out 1; }
@keyframes flash { from { box-shadow: 0 0 0 4px var(--ok); } to { box-shadow: 0 0 0 0 transparent; } }
@media (prefers-reduced-motion: reduce) { .lesson.flash { animation: none; } }

.legend { display: flex; flex-wrap: wrap; gap: .4rem .9rem; margin-top: .8rem; font-size: .8rem; color: var(--muted); }
.legend .sw { display: inline-block; width: .8rem; height: .8rem; border-radius: 3px; vertical-align: -1px; margin-right: .3rem;
  background: hsl(var(--h) var(--lesson-s) var(--lesson-l)); border-left: 3px solid hsl(var(--h) 60% var(--lesson-edge-l)); }
.move-hint { position: sticky; bottom: 1rem; z-index: 4; }

/* availability picker */
table.avail { border-collapse: separate; border-spacing: 3px; }
table.avail th { font-size: .75rem; color: var(--muted); font-weight: 600; padding: .2rem; }
table.avail button.cell { width: 2.6rem; height: 2rem; border-radius: 6px; border: 1px solid var(--line-strong); background: var(--ok-soft); color: var(--ok); cursor: pointer; font-size: .75rem; }
table.avail button.cell[aria-pressed="true"] { background: var(--bad-soft); color: var(--bad); border-color: var(--bad); }
table.avail button.dayhead { background: none; border: 0; color: var(--text); font: inherit; font-weight: 600; cursor: pointer; text-decoration: underline dotted; }

/* ---------- dialog ---------- */
dialog { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); color: var(--text); padding: 0; width: min(720px, calc(100vw - 2rem)); max-height: calc(100vh - 2rem); box-shadow: 0 20px 50px rgb(0 0 0 / 25%); }
dialog:modal { overscroll-behavior: contain; }
dialog::backdrop { background: rgb(10 15 25 / 45%); overflow: hidden; overscroll-behavior: contain; }
dialog .dlg-head { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.2rem .5rem; }
dialog .dlg-head h2 { margin: 0; }
dialog .dlg-body { padding: .25rem 1.2rem 1rem; overflow: auto; }
dialog .dlg-foot { display: flex; justify-content: flex-end; gap: .5rem; padding: .8rem 1.2rem 1rem; border-top: 1px solid var(--line); flex-wrap: wrap; }

.choice-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: .7rem; }
.choice { text-align: left; border: 1px solid var(--line-strong); border-radius: 10px; padding: .9rem; background: var(--surface); color: var(--text); font: inherit; cursor: pointer; display: grid; gap: .25rem; }
.choice:hover { border-color: var(--brand); background: var(--brand-soft); }
.choice strong { font-size: .98rem; }
.choice span { font-size: .84rem; color: var(--muted); }
.choice.recommended { border-color: var(--brand); }

.toast { position: fixed; left: 50%; bottom: 1.2rem; transform: translateX(-50%) translateY(150%); background: var(--text); color: var(--bg); padding: .6rem 1rem; border-radius: 8px; font-size: .9rem; transition: transform .2s; z-index: 50; max-width: calc(100vw - 2rem); }
.toast.show { transform: translateX(-50%) translateY(0); }

.list-plain { list-style: none; padding: 0; margin: 0; }
.list-plain li { padding: .55rem 0; border-bottom: 1px solid var(--line); }
.list-plain li:last-child { border-bottom: 0; }
.sub-row { display: grid; grid-template-columns: 9rem 1fr; gap: .8rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }
.sub-row:last-child { border-bottom: 0; }
.tag { display: inline-block; padding: .15rem .5rem; border-radius: 6px; background: var(--surface-2); margin: .15rem .25rem .15rem 0; font-size: .85rem; }
.tag.best { background: var(--ok-soft); color: var(--ok); font-weight: 600; }

.progress { height: 6px; background: var(--surface-2); border-radius: 99px; overflow: hidden; margin: .8rem 0; }
.progress span { display: block; height: 100%; width: 40%; background: var(--brand); border-radius: 99px; animation: slide 1.1s ease-in-out infinite; }
@keyframes slide { from { transform: translateX(-100%); } to { transform: translateX(260%); } }

@media (max-width: 640px) {
  .topbar, .steps { padding-left: 1rem; padding-right: 1rem; }
  main { padding: 1rem; }
  .sub-row { grid-template-columns: 1fr; gap: .3rem; }
  .save-state { display: none; }
  .topbar-actions .btn { padding: .4rem .55rem; }
}

/* ---------- print: only the timetable sheets, always light ---------- */
@media print {
  :root { color-scheme: light; --bg: #fff; --surface: #fff; --surface-2: #f3f4f6; --text: #000; --muted: #444; --line: #bbb; --lesson-l: 92%; --lesson-s: 65%; --lesson-edge-l: 40%; }
  body { background: #fff; }
  .topbar, .steps, .no-print, .toast, .move-hint { display: none !important; }
  main { padding: 0; max-width: none; }
  .tt-sheet { border: 0; box-shadow: none; padding: 0; break-after: page; }
  .tt-sheet:last-child { break-after: auto; }
  table.tt { min-width: 0; }
  table.tt td.slot { height: 3.9rem; }
  .lesson { cursor: default; print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  table.tt td.brk { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  @page { size: A4 landscape; margin: 10mm; }
}