/* ===== DESIGN TOKENS ===== */
:root {
  --bg: #000;
  --bg-elevated: #0a0a0a;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --bg-overlay: rgba(0, 0, 0, 0.85);

  --text-primary: #fff;
  --text-secondary: #bebebe;
  --text-tertiary: #808080;

  --accent: #f06a15;
  --accent-dim: rgba(240, 106, 21, 0.15);
  --accent-hover: #d45500;

  --border: #1f1f1f;
  --border-hover: #333;

  --bg-header: rgba(0, 0, 0, 0.92);
  --bg-nav: rgba(0, 0, 0, 0.95);
  --bg-sheet: #111;
  --bg-toast: #1a1a1a;
  --btn-bg: rgba(255, 255, 255, 0.08);
  --btn-bg-hover: rgba(255, 255, 255, 0.12);

  --font: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --nav-height: 64px;
  --header-height: auto;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f4f4;
  --bg-elevated: #fff;
  --bg-card: rgba(0, 0, 0, 0.04);
  --bg-card-hover: rgba(0, 0, 0, 0.07);
  --bg-overlay: rgba(0, 0, 0, 0.45);
  --text-primary: #111;
  --text-secondary: #444;
  --text-tertiary: #888;
  --accent-dim: rgba(240, 106, 21, 0.12);
  --border: #e0e0e0;
  --border-hover: #c8c8c8;
  --bg-header: rgba(244, 244, 244, 0.95);
  --bg-nav: rgba(255, 255, 255, 0.97);
  --bg-sheet: #fff;
  --bg-toast: #fff;
  --btn-bg: rgba(0, 0, 0, 0.06);
  --btn-bg-hover: rgba(0, 0, 0, 0.1);
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { color-scheme: dark; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent; }
html[data-theme="light"] { color-scheme: light; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100dvh;
  overflow-x: hidden;
}
button { cursor: pointer; font-family: inherit; border: none; background: none; color: inherit; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== LAYOUT ===== */
#app {
  max-width: 680px;
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px 0;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.theme-toggle-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
  transition: color 150ms ease;
  flex-shrink: 0;
}

.theme-toggle-btn:hover { color: var(--text-secondary); }
.theme-toggle-btn svg { width: 18px; height: 18px; }

.site-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.site-date {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.live-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  padding: 4px 10px;
  border: 1px solid rgba(240, 106, 21, 0.3);
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out 3;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hidden { display: none !important; }

/* ===== LEVEL TABS ===== */
.level-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}

.level-tab {
  flex: 1;
  padding: 7px 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
  transition: all 150ms ease;
  border-bottom: 2px solid transparent;
}

.level-tab:hover { color: var(--text-secondary); }

.level-tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}

/* ===== TOPIC CHIPS ===== */
.topic-chips {
  display: flex;
  gap: 6px;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.topic-chips::-webkit-scrollbar { display: none; }

.chip {
  flex-shrink: 0;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 150ms ease;
  white-space: nowrap;
}

.chip:hover { color: var(--text-secondary); border-color: var(--border-hover); }
.chip.active { color: var(--accent); border-color: var(--accent); background: var(--accent-dim); }

/* ===== MAIN CONTENT ===== */
#main-content {
  flex: 1;
  padding: 16px 20px calc(var(--nav-height) + var(--safe-bottom) + 16px);
  min-height: 0;
}

.view { display: block; }
.view.hidden { display: none; }

/* ===== CARDS GRID ===== */
.cards-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ===== CARD ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, transform 100ms ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.card:active { transform: scale(0.99); }

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.card-level {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
}

.level-zacatecnik { color: #10b981; background: rgba(16, 185, 129, 0.1); }
.level-builder { color: var(--accent); background: var(--accent-dim); }
.level-expert { color: #818cf8; background: rgba(129, 140, 248, 0.1); }

.card-type {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.card-topic {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-left: auto;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card-excerpt {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}

.card-readmore {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
}

.card-time {
  font-size: 12px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Resurfacing card */
.card.resurfaced {
  border-color: rgba(240, 106, 21, 0.2);
}

.resurfacing-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(240, 106, 21, 0.3);
  border-radius: 4px;
  padding: 2px 7px;
}

/* ===== SECTION HEADER ===== */
.section-header {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 16px 0 8px;
}

/* ===== LOADING & EMPTY ===== */
.loading-state {
  display: flex;
  justify-content: center;
  padding: 60px 0;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center;
  padding: 60px 0;
  color: var(--text-tertiary);
  font-size: 14px;
}

/* ===== ARCHIVE ===== */
.archive-header {
  margin-bottom: 20px;
}

.archive-month-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}

.archive-date-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.archive-month-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.archive-month-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.archive-days {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.archive-day-btn {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 150ms ease;
}

.archive-day-btn:hover { border-color: var(--border-hover); color: var(--text-primary); }
.archive-day-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

/* ===== SEARCH ===== */
.search-wrapper {
  margin-bottom: 16px;
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 150ms ease;
}

.search-input:focus { border-color: var(--accent); }
.search-input::placeholder { color: var(--text-tertiary); }
.search-input::-webkit-search-cancel-button { display: none; }

.search-hint {
  font-size: 13px;
  color: var(--text-tertiary);
  text-align: center;
  padding: 40px 0;
}

/* ===== TRANSCRIPT ===== */
.transcript-back {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.back-btn {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  padding: 0;
}

#transcript-date-label {
  font-size: 13px;
  color: var(--text-tertiary);
}

.transcript-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.transcript-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.transcript-group-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.transcript-message {
  display: flex;
  gap: 12px;
}

.msg-time {
  font-size: 11px;
  color: var(--text-tertiary);
  min-width: 36px;
  padding-top: 2px;
  flex-shrink: 0;
}

.msg-body { flex: 1; min-width: 0; }

.msg-author {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 3px;
}

.msg-author.is-host { color: var(--text-secondary); }

.msg-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ===== CARD OVERLAY ===== */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.overlay.hidden { display: none; }

.overlay-backdrop {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  cursor: pointer;
}

.overlay-sheet {
  position: relative;
  background: var(--bg-sheet);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  border-top: 1px solid var(--border);
  max-height: 90dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

@media (min-width: 640px) {
  .overlay {
    align-items: center;
    justify-content: center;
    padding: 40px;
  }
  .overlay-sheet {
    border-radius: var(--radius-xl);
    max-height: 80vh;
    width: 100%;
    max-width: 600px;
    border: 1px solid var(--border);
  }
}

.overlay-handle {
  width: 36px;
  height: 4px;
  background: var(--border-hover);
  border-radius: 2px;
  margin: 12px auto 0;
  flex-shrink: 0;
}

@media (min-width: 640px) { .overlay-handle { display: none; } }

.overlay-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 16px 20px 12px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}

.overlay-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  flex: 1;
  min-width: 0;
  padding-right: 12px;
}

.overlay-close-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: color 150ms ease;
}

.overlay-close-btn:hover { color: var(--text-primary); }
.overlay-close-btn svg { width: 18px; height: 18px; }

.overlay-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.overlay-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.overlay-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.overlay-text p {
  margin-bottom: 16px;
}
.overlay-text p:last-child { margin-bottom: 0; }

.overlay-text ul,
.overlay-text ol {
  padding-left: 22px;
  margin-bottom: 16px;
  margin-top: 4px;
}

.overlay-text li {
  margin-bottom: 7px;
  line-height: 1.65;
}
.overlay-text li:last-child { margin-bottom: 0; }

.overlay-text ul + p,
.overlay-text ol + p {
  margin-top: 4px;
}

.overlay-text h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-top: 24px;
  margin-bottom: 10px;
}

.overlay-text h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 18px;
  margin-bottom: 8px;
}

.overlay-text strong {
  font-weight: 600;
  color: var(--text-primary);
}

.overlay-text em {
  font-style: italic;
  color: var(--text-secondary);
}

.overlay-text code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
  color: var(--accent);
  background: rgba(240, 106, 21, 0.1);
  border: 1px solid rgba(240, 106, 21, 0.2);
  padding: 1px 6px;
  border-radius: 4px;
  white-space: nowrap;
}

.overlay-footer {
  padding: 16px 20px calc(16px + var(--safe-bottom));
  display: flex;
  gap: 10px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ===== BUTTONS ===== */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--btn-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 150ms ease;
}

.btn-secondary svg { width: 16px; height: 16px; }
.btn-secondary:hover { background: var(--btn-bg-hover); border-color: var(--border-hover); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-tertiary);
  border-radius: var(--radius-md);
  transition: color 150ms ease;
  margin-left: auto;
}

.btn-ghost:hover { color: var(--text-secondary); }

/* ===== BOTTOM NAV ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 680px;
  height: calc(var(--nav-height) + var(--safe-bottom));
  display: flex;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  z-index: 50;
}

.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding-bottom: var(--safe-bottom);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  transition: color 150ms ease;
}

.nav-btn:hover { color: var(--text-secondary); }
.nav-btn.active { color: var(--accent); }

.nav-icon {
  width: 22px;
  height: 22px;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + var(--safe-bottom) + 16px);
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-toast);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  z-index: 200;
  white-space: nowrap;
  animation: toast-in 200ms ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== CARD TYPE COLOR ACCENTS ===== */
.card[data-type="NÁSTROJE"] { border-left: 3px solid #3b82f6; }
.card[data-type="POSTAVIL JSEM"] { border-left: 3px solid #10b981; }
.card[data-type="OTEVŘENÁ OTÁZKA"] { border-left: 3px solid #8b5cf6; }
.card[data-type="TÉMA TÝDNE"] { border-left: 3px solid #f59e0b; }
.card[data-type="INSIGHT"] { border-left: 3px solid var(--accent); }

/* ===== SEARCH HIGHLIGHT ===== */
.highlight { color: var(--accent); font-weight: 600; }

/* ===== SCROLL RESTORATION ===== */
.cards-grid { overscroll-behavior: contain; }