/* layout.css — app shell, sidebar, slides, rozcestník */

/* -------------------- ROZCESTN\u00cdK -------------------- */
.hub {
  min-height: 100vh;
  display: flex; flex-direction: column;
}
.hub-header {
  padding: var(--sp-10) var(--sp-8) var(--sp-6);
  max-width: 1280px; margin: 0 auto; width: 100%;
}
.hub-brand { display: flex; align-items: center; gap: 14px; margin-bottom: var(--sp-8); }
.hub-brand .mark {
  width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: grid; place-items: center; color: white;
  box-shadow: 0 4px 12px rgba(14, 165, 164, 0.28);
}
.hub-brand .meta { display: flex; flex-direction: column; }
.hub-brand .name { font-weight: 600; font-size: var(--fs-md); letter-spacing: -0.01em; }
.hub-brand .sub { font-size: var(--fs-xs); color: var(--text-secondary); font-family: var(--font-mono); }

.hub-hero {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: var(--sp-10); align-items: end;
  padding-bottom: var(--sp-6); border-bottom: 1px solid var(--border);
}
@media (max-width: 960px) { .hub-hero { grid-template-columns: 1fr; } }
.hub-hero h1 {
  font-size: var(--fs-3xl); font-weight: 700; letter-spacing: -0.025em;
  margin-bottom: var(--sp-4); max-width: 18ch;
}
.hub-hero .lede { font-size: var(--fs-md); color: var(--text-secondary); max-width: 52ch; }
.hub-hero .overview {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4);
}
.hub-hero .ov-card {
  padding: var(--sp-4) var(--sp-5);
  border: 1px solid var(--border); border-radius: var(--r-md);
  background: var(--bg-card);
}
.hub-hero .ov-card .v { font-size: var(--fs-2xl); font-weight: 700; letter-spacing: -0.02em; }
.hub-hero .ov-card .k { font-size: var(--fs-xs); color: var(--text-secondary); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; }

.hub-main {
  max-width: 1280px; margin: 0 auto; width: 100%;
  padding: var(--sp-10) var(--sp-8) var(--sp-16);
  flex: 1;
}
.hub-section-h {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: var(--sp-6);
}
.hub-section-h h2 { font-size: var(--fs-xl); }
.hub-section-h .note { font-size: var(--fs-sm); color: var(--text-secondary); }

.hub-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-5);
}
@media (max-width: 1100px) { .hub-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .hub-grid { grid-template-columns: 1fr; } }

.tile {
  position: relative;
  display: flex; flex-direction: column;
  padding: var(--sp-5);
  min-height: 230px;
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--bg-card);
  transition: all 200ms ease;
  overflow: hidden;
}
.tile::before {
  content: ''; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--accent);
  transform: scaleX(0); transform-origin: left; transition: transform 300ms ease;
}
.tile:hover {
  border-color: var(--border-strong);
  box-shadow: var(--sh-md);
  transform: translateY(-2px);
}
.tile:hover::before { transform: scaleX(1); }
.tile .tile-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--sp-4);
}
.tile .num {
  font-family: var(--font-mono); font-size: 13px; color: var(--text-muted);
  letter-spacing: 0.02em;
}
.tile .status {
  font-size: 11px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em;
  padding: 3px 9px; border-radius: 999px;
  background: var(--bg-subtle); color: var(--text-secondary);
  display: inline-flex; align-items: center; gap: 6px;
}
.tile .status .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--text-muted); }
.tile .status.in-progress { background: var(--amber-light); color: #92400E; }
.tile .status.in-progress .dot { background: var(--amber); }
.tile .status.done { background: var(--success-light); color: #065F46; }
.tile .status.done .dot { background: var(--success); }

.tile h3 { font-size: var(--fs-lg); margin-bottom: var(--sp-2); letter-spacing: -0.015em; }
.tile p { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.5; }

.tile .tile-foot {
  margin-top: auto; padding-top: var(--sp-4);
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px;
}
.tile .progress {
  flex: 1; height: 4px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden;
}
.tile .progress .bar { height: 100%; background: var(--accent); border-radius: 999px; transition: width 400ms; }
.tile .pct { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-secondary); min-width: 34px; text-align: right; }

.hub-footer {
  max-width: 1280px; margin: 0 auto; width: 100%;
  padding: var(--sp-6) var(--sp-8) var(--sp-10);
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  font-size: var(--fs-xs); color: var(--text-secondary);
}

/* -------------------- LESSON SHELL -------------------- */
.lesson {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
}
.sidebar {
  border-right: 1px solid var(--border);
  background: var(--bg-card);
  padding: var(--sp-6) var(--sp-5);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: var(--sp-5); border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-5);
}
.sidebar-brand .mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: grid; place-items: center; color: white;
}
.sidebar-brand .name { font-size: var(--fs-sm); font-weight: 600; }
.sidebar-brand .sub { font-size: 11px; color: var(--text-muted); font-family: var(--font-mono); }

.sidebar .lesson-tag {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent-dark); letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 6px;
}
.sidebar h2 {
  font-size: var(--fs-md); margin-bottom: var(--sp-4); letter-spacing: -0.01em;
}
.sidebar .progress-shell {
  display: grid; gap: 6px; margin-bottom: var(--sp-5);
}
.sidebar .progress-shell .p-label {
  display: flex; justify-content: space-between; font-size: 11px;
  color: var(--text-secondary); font-family: var(--font-mono); letter-spacing: 0.04em;
}
.sidebar .progress-shell .track { height: 4px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden; }
.sidebar .progress-shell .track .bar { height: 100%; background: var(--accent); border-radius: 999px; transition: width 300ms; }

.slide-nav { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.slide-nav li a {
  display: grid; grid-template-columns: 22px 1fr; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--r-sm);
  font-size: var(--fs-sm); color: var(--text-secondary);
  text-decoration: none;
}
.slide-nav li a:hover { background: var(--bg-subtle); color: var(--text-primary); text-decoration: none; }
.slide-nav li a .n {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-muted);
  width: 22px; text-align: right;
}
.slide-nav li a.current {
  background: var(--accent-tint); color: var(--accent-dark); font-weight: 500;
}
.slide-nav li a.current .n { color: var(--accent-dark); }
.slide-nav li a.done .n::before { content: '\2713\2002'; color: var(--success); }

.sidebar-foot {
  margin-top: auto; padding-top: var(--sp-5); border-top: 1px solid var(--border);
  display: grid; gap: 8px; font-size: var(--fs-xs); color: var(--text-secondary);
}
.sidebar-foot .keys { display: flex; flex-wrap: wrap; gap: 6px; }
.sidebar-foot a.back { color: var(--text-secondary); display: inline-flex; gap: 6px; align-items: center; }
.sidebar-foot a.back:hover { color: var(--accent-dark); }

/* Main area */
.lesson-main {
  position: relative;
  padding: 0;
  min-height: 100vh;
  overflow-x: hidden;
}
.lesson-topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 12px 22px;
  background: rgba(250, 250, 247, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.lesson-topbar .crumbs {
  font-size: var(--fs-xs); color: var(--text-secondary);
  font-family: var(--font-mono); letter-spacing: 0.02em;
}
.lesson-topbar .crumbs b { color: var(--text-primary); font-weight: 600; }
.lesson-topbar .spacer { flex: 1; }
.lesson-topbar .slide-counter { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-secondary); }
.lesson-topbar .nav-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg-card); color: var(--text-secondary);
  transition: all 140ms;
}
.lesson-topbar .nav-btn:hover { color: var(--accent-dark); border-color: var(--accent); background: var(--accent-tint); }
.lesson-topbar .nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.slides-stage {
  position: relative;
}
.slide {
  display: none;
  min-height: calc(100vh - 60px);
  padding: 0;
  animation: slideIn 280ms ease;
}
.slide.active { display: block; }
@keyframes slideIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* Full-bleed hero slide variant */
.slide-hero {
  padding: var(--sp-16) var(--sp-10);
  max-width: var(--content-max); margin: 0 auto;
}
.slide-hero .big-title {
  font-size: clamp(36px, 5.2vw, 72px);
  font-weight: 700; letter-spacing: -0.03em;
  line-height: 1.05; margin-bottom: var(--sp-5);
  max-width: 16ch;
}
.slide-hero .big-title em {
  font-style: normal; color: var(--accent); font-weight: 700;
  background: linear-gradient(120deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.slide-hero .intro {
  font-size: var(--fs-lg); color: var(--text-secondary); max-width: 58ch;
  margin-bottom: var(--sp-10);
}
.slide-hero .meta-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4);
  margin-bottom: var(--sp-10);
  max-width: 760px;
}
@media (max-width: 700px) { .slide-hero .meta-grid { grid-template-columns: 1fr; } }
.slide-hero .meta {
  padding: var(--sp-4) var(--sp-5); border: 1px solid var(--border); border-radius: var(--r-md);
  background: var(--bg-card);
}
.slide-hero .meta .k { font-size: var(--fs-xs); color: var(--text-secondary); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.slide-hero .meta .v { font-size: var(--fs-md); font-weight: 600; }

/* Diagram card */
.diagram-card {
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--bg-card); padding: var(--sp-6);
}
.diagram-card .caption { margin-top: var(--sp-4); font-size: var(--fs-xs); color: var(--text-secondary); font-family: var(--font-mono); }

/* Slide foot nav */
.slide-foot-nav {
  max-width: var(--content-max); margin: 0 auto;
  padding: 0 var(--sp-8) var(--sp-16);
  display: flex; justify-content: space-between; align-items: center;
}
.slide-foot-nav .side {
  display: flex; flex-direction: column; gap: 4px; text-decoration: none; color: var(--text-secondary);
  font-size: var(--fs-sm);
}
.slide-foot-nav .side .lbl { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.slide-foot-nav .side:hover { color: var(--accent-dark); }

/* -------------------- TWEAKS PANEL -------------------- */
.tweaks-panel {
  position: fixed; right: 16px; bottom: 16px; z-index: 100;
  width: 300px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  padding: 16px;
  display: none;
  font-size: var(--fs-sm);
}
.tweaks-panel.on { display: block; }
.tweaks-panel h4 { font-size: var(--fs-sm); margin-bottom: var(--sp-3); display: flex; align-items: center; gap: 8px; }
.tweaks-panel h4::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.tw-row { display: grid; gap: 6px; margin-bottom: var(--sp-4); }
.tw-row .tl { font-size: 11px; color: var(--text-secondary); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; }
.tw-swatches { display: flex; gap: 6px; }
.tw-sw {
  width: 26px; height: 26px; border-radius: 7px; cursor: pointer;
  border: 2px solid transparent; box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08);
}
.tw-sw.on { border-color: var(--text-primary); }
.tw-seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.tw-seg button { padding: 6px 10px; font-size: 12px; color: var(--text-secondary); }
.tw-seg button.on { background: var(--accent); color: white; }