/* ==========================================================================
   layout.css - rozvrzeni stranky: hlavicka, postranni panel, plocha.
   Page skeleton: header, sidebar, stage. Vse se sklada pri uzkem okne.
   (c) 2026 Richard Lipka <lipka@fav.zcu.cz> - MIT license
   ========================================================================== */

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px var(--gap);
  padding: 14px clamp(14px, 3vw, 30px);
  background: linear-gradient(135deg, var(--deep-800) 0%, var(--sea-600) 65%, var(--sea-500) 100%);
  color: #fff;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
}

.brand-mark {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.25));
}

.brand h1 {
  color: #fff;
  font-size: 1.3rem;
}

.brand p {
  margin: 2px 0 0;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.82);
}

.mode-tabs {
  display: flex;
  gap: 6px;
  padding: 5px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-pill);
}

.header-side {
  display: flex;
  align-items: center;
  gap: 12px;
}

#main {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  align-items: start;
  gap: var(--gap-lg);
  max-width: 1680px;
  margin: 0 auto;
  padding: var(--gap-lg) clamp(14px, 3vw, 30px) 0;
}

#main.is-wide {
  grid-template-columns: minmax(0, 1fr);
}

.controls {
  position: sticky;
  top: 92px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  padding-right: 4px;
}

.controls[hidden] {
  display: none;
}

.panels {
  min-width: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  min-width: 0;
}

.panel[hidden] {
  display: none;
}

.stage-row {
  display: grid;
  grid-template-columns: minmax(260px, 380px) minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.panel-head {
  padding: 2px 2px 0;
}

.panel-sub {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.92rem;
}

.panel-actions {
  display: flex;
  justify-content: center;
  padding-bottom: 8px;
}

.big-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
}

.editor-body {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

/* Pet zalozek se do jedne rady vejde jen na sirokem okne. */
@media (max-width: 1320px) {
  .mode-tabs button {
    padding: 7px 11px;
    font-size: 0.85rem;
    gap: 5px;
  }
}

/* Dalekohled a čísla vedle sebe potřebují širší plochu než samotný panel,
   proto se skládají dřív než celý rozvrh. / The telescope and the numbers side
   by side need more room than the panel alone, so they stack first. */
@media (max-width: 1100px) {
  .stage-row {
    grid-template-columns: minmax(0, 1fr);
  }
  .editor-body {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Postranní panel zůstává vedle obsahu, dokud se vedle něj vejde i diagram.
   Na 1000 px je tedy pořád po straně; teprve pod 820 px by byl užší než jeho
   vlastní obsah, a tam se teprve skládá pod sebe.
   The sidebar stays beside the content for as long as the diagram fits next to
   it - at 1000 px it is still on the side. Only below 820 px would it be
   narrower than its own contents, and that is where it stacks. */
@media (max-width: 820px) {
  #main {
    grid-template-columns: minmax(0, 1fr);
  }
  .controls {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 640px) {
  :root {
    --font-size: 16px;
    --gap: 14px;
    --gap-lg: 18px;
  }
  .app-header {
    justify-content: center;
    text-align: center;
  }
  .brand {
    margin-right: 0;
  }
  .mode-tabs {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
}

/* --- tisk / print -----------------------------------------------------------
   Tiskne se jen prave otevreny rezim: bez hlavicky, panelu s nastavenim,
   paticky a tlacitek. Obrazek ani radek vypoctu se nerozdeli mezi dve strany.
   Only the open mode is printed: no header, settings panel, footer or buttons.
   No picture and no calculation row is split across two pages. */
@media print {
  @page {
    margin: 12mm;
  }
  body {
    background: #fff;
  }
  .app-header,
  .controls,
  .app-footer,
  .export-buttons,
  .geo-tools,
  .panel-actions {
    display: none !important;
  }
  #main {
    display: block;
    max-width: none;
    padding: 0;
  }
  .card {
    box-shadow: none;
    border: 1px solid #bbb;
  }
  svg,
  .formula-row,
  .formula-standalone,
  .given-item,
  .geo-task {
    break-inside: avoid;
  }
  .formula-symbolic,
  .formula-sub,
  .formula-standalone {
    overflow: visible;
  }
}