/* ============================================================
   AJ DRIL — style.css
   Barvy jsou definovány jako proměnné v :root — stačí změnit
   hodnoty zde a zbytek se přizpůsobí automaticky.
   ============================================================ */

:root {
  --sent-scale: 1;

  --color-bg:           #f4f6f9;
  --color-surface:      #ffffff;
  --color-surface-alt:  #f0f4f8;
  --color-border:       #dde3ea;
  --color-border-light: #eef1f5;

  --color-primary:      #2e75b6;
  --color-primary-bg:   #e8f1f9;
  --color-primary-text: #1a4f80;

  --color-success:      #1e8c45;
  --color-success-bg:   #e6f4ec;
  --color-danger:       #c0392b;
  --color-danger-bg:    #fdecea;

  --color-text:         #1a2533;
  --color-text-muted:   #6b7a8d;
  --color-text-light:   #9aa5b3;

  --color-en:           #1a4f80;
  --color-cz:           #2c3e50;
  --color-note:         #999;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 4px rgba(0,0,0,.07);
  --font: 'Segoe UI', Arial, sans-serif;
}

html { font-size: clamp(15px, 1vw + 13px, 18px); }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  padding: 1.5rem 1rem 3rem;
}

.app { max-width: 680px; margin: 0 auto; }

.app-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary-text);
  margin-bottom: 1.25rem;
}

/* Načtení souboru */
.load-panel {
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  margin-bottom: 1.25rem;
}
.load-panel p { font-size: .9rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.load-panel .hint { font-size: .78rem; color: var(--color-text-light); margin-top: .6rem; }

.db-status {
  font-size: .82rem;
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  display: none;
}
.db-status.ok  { background: var(--color-success-bg); color: var(--color-success); display: block; }
.db-status.err { background: var(--color-danger-bg);  color: var(--color-danger);  display: block; }

/* Nastavení */
.settings-panel {
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 1.1rem;
  box-shadow: 0 2px 14px rgba(46,117,182,.13);
}
.settings-panel summary {
  cursor: pointer;
  font-size: .9rem;
  font-weight: 700;
  color: var(--color-primary-text);
  list-style: none;
  user-select: none;
  background: var(--color-primary-bg);
  padding: .85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  transition: background .15s;
}
.settings-panel summary:hover { background: #cfe2f5; }
.settings-panel summary::after {
  content: '▼';
  font-size: .72rem;
  color: var(--color-primary);
  transition: transform .25s ease;
  flex-shrink: 0;
  margin-left: .5rem;
}
.settings-panel[open] summary::after { transform: rotate(180deg); }
.settings-panel[open] summary { border-bottom: 2px solid var(--color-primary); }
.settings-panel .settings-inner { padding: 1rem 1.25rem 1.25rem; }
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .9rem 1.5rem;
  margin-top: .9rem;
}
@media (max-width: 500px) { .settings-grid { grid-template-columns: 1fr; } }

.setting-group { display: flex; flex-direction: column; gap: .3rem; }
.setting-group > span {
  font-size: .75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.setting-group select {
  width: 100%;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  font-size: .83rem;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
}
.setting-group select:focus { border-color: var(--color-primary); }

.slider-row { display: flex; align-items: center; gap: .5rem; }
.slider-row input[type=range] { flex: 1; accent-color: var(--color-primary); }
.slider-val { font-size: .83rem; font-weight: 700; color: var(--color-primary); min-width: 32px; text-align: right; }
.en-rate-stack { display:flex; flex-direction:column; gap:.3rem; }
#enRate2Group { visibility:hidden; opacity:0; transition:opacity .2s ease, visibility 0s .2s; }
#enRate2Group.visible { visibility:visible; opacity:1; transition:opacity .2s ease, visibility 0s 0s; }
.rmode-lbl { display:flex; align-items:center; gap:.2rem; font-size:.72rem; font-weight:700; color:var(--color-text-muted); white-space:nowrap; cursor:pointer; user-select:none; opacity:0; pointer-events:none; transition:opacity .2s ease; }
.rmode-lbl.visible { opacity:1; pointer-events:auto; }
.rmode-lbl input[type=radio] { accent-color:var(--color-primary); cursor:pointer; }

.checkbox-row {
  display: flex; align-items: center; gap: .45rem;
  font-size: .85rem; color: var(--color-text); cursor: pointer; user-select: none;
}
.checkbox-row input[type=checkbox] { width: 15px; height: 15px; accent-color: var(--color-primary); cursor: pointer; }

.settings-divider { grid-column: 1/-1; height: 1px; background: var(--color-border-light); }

.setting-hint {
  font-size: .72rem; color: var(--color-text-muted);
  line-height: 1.4; margin-left: 1.35rem;
}

/* Témata */
.topics-wrap { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1rem; }
.topic-btn {
  padding: 5px 14px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: .8rem;
  font-family: var(--font);
  cursor: pointer;
  transition: all .15s;
}
.topic-btn:hover { background: var(--color-primary-bg); color: var(--color-primary-text); }
.topic-btn.active { background: var(--color-primary); color: #fff; border-color: transparent; font-weight: 600; }

/* Skóre */
.scores { display: flex; gap: 10px; margin-bottom: .85rem; }
.score-card {
  flex: 1; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: 8px 10px; text-align: center; box-shadow: var(--shadow-sm);
}
.score-num { font-size: 1.25rem; font-weight: 700; color: var(--color-text); line-height: 1.2; }
.score-lbl { font-size: .68rem; color: var(--color-text-light); text-transform: uppercase; letter-spacing: .05em; }

/* Progress */
.progress-bar { height: 3px; background: var(--color-border); border-radius: 2px; margin-bottom: 1rem; overflow: hidden; }
.progress-fill { height: 100%; background: var(--color-primary); border-radius: 2px; transition: width .4s ease; }

/* Karta */
.drill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: .85rem;
  box-shadow: var(--shadow-sm);
  min-height: 155px;
  display: flex;
  flex-direction: column;
  gap: .65rem;
}
.card-badge { font-size: .73rem; color: var(--color-text-light); }
.sentence-cz {
  font-size: calc(1.1rem * var(--sent-scale));
  font-weight: 600; color: var(--color-cz); line-height: 1.5;
}
.sentence-divider { height: 1px; background: var(--color-border-light); }
.sentence-en {
  font-size: calc(1.35rem * var(--sent-scale));
  color: var(--color-en); font-weight: 700; line-height: 1.5;
  opacity: 0; transition: opacity .35s ease; min-height: 1.5em;
}
.sentence-en.visible { opacity: 1; }
.sentence-note { font-size: .78rem; color: var(--color-note); font-style: italic; min-height: 1em; }

/* Ovládání */
.controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 20px; border-radius: var(--radius-xl);
  border: 1px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text); font-size: .88rem; font-family: var(--font);
  font-weight: 500; cursor: pointer; transition: all .15s; white-space: nowrap;
}
.btn:hover { background: var(--color-surface-alt); }
.btn-primary { background: var(--color-primary); color: #fff; border-color: transparent; }
.btn-primary:hover { background: var(--color-primary-text); }
.btn-sm { padding: 7px 14px; font-size: .8rem; }
.btn-ghost { border-color: var(--color-border); background: transparent; color: var(--color-text-muted); }
.btn-ghost:hover { color: var(--color-text); background: var(--color-surface-alt); }

/* Disabled filtr — viditelný ale neaktivní */
.filter-sel:disabled {
  background: var(--color-surface-alt);
  color: var(--color-text-light);
  border-color: var(--color-border-light);
  cursor: not-allowed;
  opacity: 0.6;
}

@media (max-width: 480px) {
  body { padding: 1rem .75rem 2rem; }
  .drill-card { padding: 1.1rem; }
}