/* Účtotéka Akademie – desktopový shell */
:root {
  --color-teal: #0f766e;
  --color-teal-dark: #0b544e;
  --color-teal-tint: #e7f3f1;
  --color-orange: #c2410c;
  --color-orange-dark: #9a3412;
  --color-orange-tint: #fdf1e5;
  --color-focus: #111827;
  --color-ink: #1f2937;
  --color-ink-soft: #4b5563;
  --color-surface: #fff;
  --color-surface-muted: #f4f6f5;
  --color-border: #d8ded9;
  --color-correct: #15803d;
  --color-correct-tint: #e8f5ec;
  --color-incorrect: #b91c1c;
  --color-incorrect-tint: #fdecec;
  --radius-sm: 8px;
  --radius-md: .75rem;
  --radius-lg: 1rem;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --shadow-card: 0 1px 2px rgba(15,62,58,.06), 0 8px 24px rgba(15,62,58,.06);
  --font-sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --shell-header-height: 60px;
  --shell-sidebar-width: 272px;
  --shell-main-max-width: 1360px;
  --shell-footer-min-height: 48px;
  --border-hairline: 1px solid var(--color-border);
  --shadow-panel: 0 1px 2px rgba(15,62,58,.05), 0 4px 12px rgba(15,62,58,.05);
  --shadow-sidebar: 1px 0 0 rgba(15,62,58,.06);
  --sidebar-bg: #fbfcfb;
  --sidebar-border: var(--color-border);
  --sidebar-item-current-bg: var(--color-teal-tint);
  --sidebar-item-current-accent: var(--color-teal);
  --sidebar-item-progress-accent: var(--color-orange);
  --sidebar-item-locked-fg: #9aa5a0;
  --icon-size-md: 20px;
  --icon-size-sm: 16px;
  --icon-container-size: 32px;
  --icon-container-bg: var(--color-teal-tint);
  --icon-container-bg-orange: var(--color-orange-tint);
  --tooltip-bg: var(--color-ink);
  --tooltip-fg: #fff;
  --tooltip-max-width: 22rem;
  --feedback-correct-bg: var(--color-correct-tint);
  --feedback-correct-fg: var(--color-correct);
  --feedback-incorrect-bg: var(--color-incorrect-tint);
  --feedback-incorrect-fg: var(--color-incorrect);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-surface-muted);
  display: grid;
  grid-template-columns: var(--shell-sidebar-width) 1fr;
  grid-template-rows: var(--shell-header-height) 1fr minmax(var(--shell-footer-min-height), auto);
  grid-template-areas: "header header" "sidebar main" "footer footer";
  min-height: 100vh;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 var(--space-3); }
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 100; background: #fff; color: var(--color-teal-dark); padding: var(--space-2) var(--space-3); }
.skip-link:focus { left: 0; }
.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-4);
  background: var(--color-teal);
  color: #fff;
}
.app-header__brand { font-weight: 700; font-size: 1.125rem; letter-spacing: .01em; }
.app-header__progress { margin: 0 0 0 auto; font-size: 14px; line-height: 1.4; color: rgba(255,255,255,.92); }
.sidebar {
  grid-area: sidebar;
  position: sticky;
  top: var(--shell-header-height);
  align-self: start;
  height: calc(100vh - var(--shell-header-height) - var(--shell-footer-min-height));
  background: var(--sidebar-bg);
  border-right: var(--border-hairline);
  box-shadow: var(--shadow-sidebar);
  padding: var(--space-4) 0;
  overflow-y: auto;
}
.sidebar__heading { margin: 0; padding: 0 16px 12px; color: var(--color-ink-soft); font-size: 14px; line-height: 1.4; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.sidebar__lesson { margin: 0 8px 4px; }
.sidebar__lesson-toggle {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 16px;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-ink);
  text-align: left;
  font: inherit;
  font-size: 14px;
  line-height: 1.4;
  font-weight: 600;
  cursor: pointer;
}
.sidebar__lesson-toggle::after { content: ""; width: 7px; height: 7px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); justify-self: center; transition: transform .16s ease; }
.sidebar__lesson-toggle[aria-expanded="true"] { background: var(--color-teal-tint); color: var(--color-teal-dark); }
.sidebar__lesson-toggle[aria-expanded="true"]::after { transform: rotate(225deg); }
.sidebar__steps { list-style: none; margin: 0; padding: 0; }
.sidebar__step { margin: 0; }
.sidebar__step-control {
  width: 100%;
  display: grid;
  grid-template-columns: var(--icon-size-sm) 1fr;
  gap: 8px;
  align-items: start;
  padding: 8px 16px 8px 32px;
  border: 0;
  border-left: 3px solid transparent;
  background: transparent;
  color: var(--color-ink);
  text-align: left;
  font: inherit;
  font-size: 14px;
  line-height: 1.4;
}
button.sidebar__step-control { cursor: pointer; }
.sidebar__step[data-state="displayed"] .sidebar__step-control { background: var(--sidebar-item-current-bg); border-left-color: var(--sidebar-item-current-accent); font-weight: 700; }
.sidebar__step[data-state="maxVisited"] .sidebar__step-control { border-left-color: var(--sidebar-item-progress-accent); }
.sidebar__step[data-state="locked"] .sidebar__step-control { color: var(--sidebar-item-locked-fg); }
.sidebar__step-status { grid-column: 2; color: var(--color-orange-dark); font-size: 12px; }
#app-main { grid-area: main; max-width: var(--shell-main-max-width); width: 100%; margin: 0 auto; padding: var(--space-5) var(--space-4); min-width: 0; }
.step-layout { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--space-4); align-items: start; }
.step-layout #step-card,
.step-layout[data-columns="12"] #step-card,
.step-layout #error-card,
.step-layout[data-columns="12"] #error-card { grid-column: span 12; }
.side-panels { display: none; flex-direction: column; gap: var(--space-3); }
.step-layout[data-columns="12"] .side-panels { display: none; }
.step-layout[data-columns="8-4"] #step-card { grid-column: span 8; }
.step-layout[data-columns="8-4"] .side-panels { display: flex; grid-column: span 4; }
.step-layout[data-columns="6-6"] #step-card { grid-column: span 6; }
.step-layout[data-columns="6-6"] .side-panels { display: flex; grid-column: span 6; }
.app-footer { grid-area: footer; position: relative; z-index: 12; display: flex; align-items: center; padding: var(--space-2) var(--space-4); border-top: var(--border-hairline); background: #fff; }
.app-footer__text { margin: 0; font-size: 14px; line-height: 1.4; color: var(--color-ink-soft); }
button:focus-visible, a:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }