:root {
  --clr-page: #f5f6f8;
  --clr-surface: #ffffff;
  --clr-surface-muted: #f8f9fb;
  --clr-text: #171a1f;
  --clr-text-muted: #69707a;
  --clr-border: #dfe3e8;
  --clr-border-strong: #cbd1d8;
  --clr-accent: #20242b;
  --clr-shadow: 0 16px 40px rgb(30 36 44 / 0.08);

  /* Základní paleta. Můžeš měnit rodiny, nebo níže každý předmět zvlášť. */
  --clr-family-language-en: #f8d8dc;
  --clr-family-language-de: #e6d7f5;
  --clr-family-language-fr: #edd5ef;
  --clr-family-czech: #f7efb8;
  --clr-family-math: #cfdbf2;
  --clr-family-biology: #d7efcd;
  --clr-family-chemistry: #edf0ef;
  --clr-family-physics: #cceff0;
  --clr-family-geography: #dddaf2;
  --clr-family-history: #f3d7cb;
  --clr-family-social: #f5efad;
  --clr-family-pe: #c9eedf;
  --clr-family-it: #f4ddc3;
  --clr-family-arts: #eee4c9;
  --clr-family-lab: #dddddd;
  --clr-family-special: #e8e9ec;

  /*
   * Barvy jednotlivých předmětů.
   * JS převádí např. "Č" -> --clr-subject-c a "Přcv" -> --clr-subject-prcv.
   * Klidně tedy přepiš jen konkrétní řádek na vlastní HEX/RGB/HSL barvu.
   */
  --clr-subject-a: var(--clr-family-language-en);
  --clr-subject-ak: var(--clr-family-language-en);
  --clr-subject-am: var(--clr-family-special);
  --clr-subject-ap: var(--clr-family-special);
  --clr-subject-ase: var(--clr-family-language-en);
  --clr-subject-bch: var(--clr-family-chemistry);
  --clr-subject-bi: var(--clr-family-biology);
  --clr-subject-bi4: var(--clr-family-biology);
  --clr-subject-bise: var(--clr-family-biology);
  --clr-subject-ch: var(--clr-family-chemistry);
  --clr-subject-ch4: var(--clr-family-chemistry);
  --clr-subject-chcv: var(--clr-family-chemistry);
  --clr-subject-chse: var(--clr-family-chemistry);
  --clr-subject-d: var(--clr-family-history);
  --clr-subject-d4: var(--clr-family-history);
  --clr-subject-dvu: var(--clr-family-arts);
  --clr-subject-dg: var(--clr-family-special);
  --clr-subject-dse: var(--clr-family-history);
  --clr-subject-ese: var(--clr-family-special);
  --clr-subject-f: var(--clr-family-physics);
  --clr-subject-f4: var(--clr-family-physics);
  --clr-subject-fk: var(--clr-family-physics);
  --clr-subject-fth: var(--clr-family-physics);
  --clr-subject-fcv: var(--clr-family-physics);
  --clr-subject-fex: var(--clr-family-physics);
  --clr-subject-fils: var(--clr-family-social);
  --clr-subject-fr: var(--clr-family-language-fr);
  --clr-subject-fse: var(--clr-family-physics);
  --clr-subject-gpmv: var(--clr-family-geography);
  --clr-subject-ge: var(--clr-family-geography);
  --clr-subject-ge4: var(--clr-family-geography);
  --clr-subject-hs: var(--clr-family-social);
  --clr-subject-hu: var(--clr-family-arts);
  --clr-subject-hv: var(--clr-family-arts);
  --clr-subject-inf: var(--clr-family-it);
  --clr-subject-ise: var(--clr-family-social);
  --clr-subject-kei: var(--clr-family-special);
  --clr-subject-lse: var(--clr-family-social);
  --clr-subject-m: var(--clr-family-math);
  --clr-subject-mcv: var(--clr-family-math);
  --clr-subject-mse: var(--clr-family-math);
  --clr-subject-n: var(--clr-family-language-de);
  --clr-subject-njl: var(--clr-family-language-de);
  --clr-subject-nk: var(--clr-family-language-de);
  --clr-subject-nse: var(--clr-family-language-de);
  --clr-subject-prs: var(--clr-family-lab);
  --clr-subject-prcv: var(--clr-family-lab);
  --clr-subject-sk: var(--clr-family-social);
  --clr-subject-sv: var(--clr-family-social);
  --clr-subject-sva: var(--clr-family-social);
  --clr-subject-svse: var(--clr-family-social);
  --clr-subject-sbor: var(--clr-family-arts);
  --clr-subject-tv: var(--clr-family-pe);
  --clr-subject-tvse: var(--clr-family-pe);
  --clr-subject-uvk: var(--clr-family-arts);
  --clr-subject-vo: var(--clr-family-social);
  --clr-subject-vut: var(--clr-family-special);
  --clr-subject-vv: var(--clr-family-arts);
  --clr-subject-c: var(--clr-family-czech);
  --clr-subject-sp: var(--clr-family-language-en);
  --clr-subject-spk: var(--clr-family-language-en);

  --clr-subject-default: #e7e9ed;

  /* Všechny markery (TH, oběd, porada, výuk…) používají jednotnou barvu. */
  --clr-field-marker: #e5e7eb;
  --clr-field-conflict: #ffd5d5;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--clr-page);
}

body {
  margin: 0;
  color: var(--clr-text);
  background:
    radial-gradient(circle at top left, rgb(255 255 255 / 0.95), transparent 32rem),
    var(--clr-page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
select,
input {
  font: inherit;
}

.page-shell {
  width: min(1500px, calc(100% - 48px));
  margin: 0 auto;
  padding: 44px 0 64px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--clr-text-muted);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
}

.intro {
  margin: 14px 0 0;
  color: var(--clr-text-muted);
  font-size: 1rem;
}

.button {
  appearance: none;
  border: 1px solid var(--clr-border-strong);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-secondary {
  color: var(--clr-text);
  background: rgb(255 255 255 / 0.72);
}

.control-card,
.teacher-card,
.timetable-card {
  border: 1px solid var(--clr-border);
  border-radius: 18px;
  background: rgb(255 255 255 / 0.92);
  box-shadow: var(--clr-shadow);
}

.control-card {
  display: grid;
  grid-template-columns: auto minmax(220px, 420px) 1fr;
  align-items: center;
  gap: 12px 16px;
  padding: 16px;
}

.control-card label {
  font-weight: 720;
}

.control-card select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--clr-border-strong);
  border-radius: 11px;
  padding: 0 42px 0 12px;
  color: var(--clr-text);
  background: var(--clr-surface);
}

.control-card select:focus-visible,
.button:focus-visible,
.timetable-scroll:focus-visible {
  outline: 3px solid rgb(38 99 235 / 0.25);
  outline-offset: 2px;
}

.load-status {
  margin: 0;
  color: var(--clr-text-muted);
  font-size: 0.84rem;
}

.teacher-card {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-top: 18px;
  padding: 22px 24px;
}

.teacher-code {
  margin: 0 0 4px;
  color: var(--clr-text-muted);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.teacher-card h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  letter-spacing: -0.03em;
}

.teacher-summary {
  margin: 0;
  color: var(--clr-text-muted);
  white-space: nowrap;
}

.timetable-card {
  margin-top: 18px;
  overflow: hidden;
}

.mobile-hint {
  display: none;
  margin: 0;
  padding: 10px 14px;
  color: var(--clr-text-muted);
  background: var(--clr-surface-muted);
  border-bottom: 1px solid var(--clr-border);
  font-size: 0.8rem;
}

.timetable-scroll {
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-gutter: stable;
}

.timetable {
  width: 100%;
  min-width: 1120px;
  border-spacing: 0;
  border-collapse: separate;
  table-layout: fixed;
}

.day-column {
  width: 84px;
}

.lesson-column {
  width: 103px;
}

.timetable th,
.timetable td {
  border-right: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.timetable tr > :last-child {
  border-right: 0;
}

.timetable tbody tr:last-child > * {
  border-bottom: 0;
}

.slot-heading,
.day-heading {
  background: #fafbfc;
}

.slot-heading {
  position: sticky;
  top: 0;
  z-index: 3;
  height: 64px;
  padding: 8px 6px;
  text-align: center;
  box-shadow: inset 0 -1px 0 var(--clr-border);
}

.slot-number,
.slot-time {
  display: block;
}

.slot-number {
  font-size: 0.94rem;
  font-weight: 800;
}

.slot-time {
  margin-top: 3px;
  color: var(--clr-text-muted);
  font-size: 0.72rem;
  font-weight: 560;
  white-space: nowrap;
}

.day-heading {
  position: sticky;
  left: 0;
  z-index: 2;
  padding: 10px;
  font-size: 0.88rem;
  font-weight: 800;
  text-align: center;
  box-shadow: inset -1px 0 0 var(--clr-border);
}

.corner-heading {
  top: 0;
  z-index: 5;
}

.timetable tbody tr {
  height: 128px;
}

.field {
  position: relative;
  min-width: 0;
  padding: 4px;
  vertical-align: top;
  background: var(--clr-surface);
}

.field-empty {
  background:
    linear-gradient(135deg, transparent 49.3%, rgb(28 33 40 / 0.025) 49.5%, rgb(28 33 40 / 0.025) 50.5%, transparent 50.7%),
    #fff;
}

.field-lesson,
.field-marker {
  background: color-mix(in srgb, var(--field-color) 90%, white 10%);
}

.field-lesson::before,
.field-marker::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: color-mix(in srgb, var(--field-color) 72%, black 28%);
}

.field-inner {
  display: flex;
  min-height: 118px;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 8px 8px 7px 9px;
  overflow: hidden;
}

.field-subject {
  max-width: 100%;
  font-size: 1rem;
  line-height: 1.08;
  letter-spacing: -0.015em;
  overflow-wrap: anywhere;
}

.field-classes,
.field-groups {
  max-width: 100%;
  font-size: 0.76rem;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.field-classes {
  font-weight: 670;
}

.field-groups {
  color: rgb(23 26 31 / 0.7);
}

.field-room {
  display: inline-flex;
  align-items: center;
  margin-top: auto;
  border: 1px solid rgb(23 26 31 / 0.12);
  border-radius: 999px;
  padding: 2px 7px;
  background: rgb(255 255 255 / 0.46);
  font-size: 0.7rem;
  font-weight: 720;
}

.field-marker {
  --field-color: var(--clr-field-marker);
}

.marker-title {
  text-transform: none;
}

.field-conflict {
  padding: 10px;
  background:
    repeating-linear-gradient(-45deg, rgb(255 255 255 / 0.25) 0 7px, transparent 7px 14px),
    var(--clr-field-conflict);
  font-size: 0.72rem;
}

.field-conflict strong,
.conflict-line {
  display: block;
}

.conflict-line {
  margin-top: 5px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 24px, 1500px);
    padding: 24px 0 40px;
  }

  .page-header {
    flex-direction: column;
    margin-bottom: 18px;
  }

  .page-header .button {
    width: 100%;
  }

  .control-card {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 13px;
    border-radius: 15px;
  }

  .load-status {
    margin-top: 3px;
  }

  .teacher-card {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 17px;
    border-radius: 15px;
  }

  .teacher-summary {
    white-space: normal;
  }

  .timetable-card {
    border-radius: 15px;
  }

  .mobile-hint {
    display: block;
  }

  .timetable {
    min-width: 980px;
  }

  .day-column {
    width: 65px;
  }

  .lesson-column {
    width: 91px;
  }

  .timetable tbody tr {
    height: 112px;
  }

  .field-inner {
    min-height: 102px;
    padding: 7px 6px 6px 7px;
  }

  .field-subject {
    font-size: 0.9rem;
  }

  .field-classes,
  .field-groups {
    font-size: 0.7rem;
  }
}

.page-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;

  margin: 2rem 0 1rem;
  padding: 0 1rem;

  font-size: 0.8rem;
  color: var(--clr-text-muted, #6b7280);
}

.footer-separator {
  opacity: 0.45;
}

.support-link {
  color: inherit;
  text-decoration: none;
  opacity: 0.8;

  transition:
    opacity 150ms ease,
    color 150ms ease;
}

.support-link:hover,
.support-link:focus-visible {
  color: var(--clr-text, #111827);
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

@media print {
  body {
    background: #fff;
  }

  .page-shell {
    width: 100%;
    padding: 0;
  }

  .page-header,
  .control-card,
  .mobile-hint {
    display: none;
  }

  .teacher-card,
  .timetable-card {
    border: 0;
    box-shadow: none;
  }

  .timetable-scroll {
    overflow: visible;
  }

  .timetable {
    min-width: 0;
  }

  .slot-heading,
  .day-heading {
    position: static;
  }
}