/* =============================================
   EFL Exercise Builder — Global Styles
   ============================================= */

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

:root {
  --bg-primary:       #ffffff;
  --bg-secondary:     #f3f4f6;
  --bg-success:       #ecfdf5;
  --bg-danger:        #fef2f2;
  --bg-warning:       #fffbeb;
  --bg-accent:        #e6f1fb;
  --text-primary:     #111827;
  --text-secondary:   #6b7280;
  --text-muted:       #9ca3af;
  --text-success:     #0f6e56;
  --text-danger:      #993c1d;
  --text-warning:     #ba7517;
  --border:           #e5e7eb;
  --border-strong:    #d1d5db;
  --border-success:   #6ee7b7;
  --border-danger:    #fca5a5;
  --border-accent:    #378ade;
  --fill-accent:      #7f77dd;
  --radius:           8px;
  --radius-lg:        12px;
  --font-sans:        system-ui, -apple-system, sans-serif;
  --font-mono:        ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary:     #1f2937;
    --bg-secondary:   #374151;
    --bg-success:     #064e3b;
    --bg-danger:      #4c1414;
    --bg-warning:     #451a03;
    --bg-accent:      #1e3a5f;
    --text-primary:   #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted:     #6b7280;
    --text-success:   #6ee7b7;
    --text-danger:    #fca5a5;
    --text-warning:   #fcd34d;
    --border:         #374151;
    --border-strong:  #4b5563;
    --border-success: #065f46;
    --border-danger:  #7f1d1d;
    --border-accent:  #5a9bd8;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
}

#app {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  font-size: 100%;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.app-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}
.exercise-nav {
  display: flex;
  gap: 6px;
}
.nav-btn {
  padding: 6px 14px;
  font-size: 0.875rem;
  border-radius: var(--radius);
  border: 0.5px solid var(--border-strong);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
}
.nav-btn.active {
  background: var(--bg-accent);
  border-color: var(--border-accent);
  color: var(--text-primary);
  font-weight: 500;
}
.nav-btn:hover:not(.active) { background: var(--bg-secondary); }

/* Common form elements */
textarea, input[type=text] {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 0.5px solid var(--border-strong);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.94em;
  padding: 8px 12px;
  width: 100%;
}
textarea { resize: vertical; }

button {
  padding: 7px 16px;
  border: 0.5px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
}
button:hover { background: var(--bg-secondary); }

/* Setup panels */
.setup-panel { max-width: 680px; }
.setup-panel p.hint { font-size: 0.875rem; color: var(--text-secondary); margin: 0 0 8px; }
.setup-actions { margin-top: 12px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.setup-actions .hint-text { font-size: 0.81rem; color: var(--text-secondary); }

/* Mode selector */
.mode-row { display: flex; gap: 10px; margin-bottom: 14px; }
.mode-btn { flex: 1; padding: 10px 14px; border-radius: var(--radius); border: 0.5px solid var(--border-strong); background: var(--bg-primary); cursor: pointer; text-align: left; }
.mode-btn.active { border: 2px solid var(--border-accent); background: var(--bg-accent); }
.mode-btn .mt { font-weight: 500; font-size: 0.94em; display: block; margin-bottom: 2px; color: var(--text-primary); }
.mode-btn .ms { font-size: 0.81em; color: var(--text-secondary); }
.sub-row { display: flex; gap: 10px; margin: 10px 0; }
.sub-btn { flex: 1; padding: 8px 12px; font-size: 0.88em; border-radius: var(--radius); border: 0.5px solid var(--border-strong); background: var(--bg-primary); cursor: pointer; }
.sub-btn.active { border: 2px solid var(--border-accent); background: var(--bg-accent); }

/* Score row */
.score-row { display: flex; gap: 10px; align-items: center; margin-bottom: 1.25rem; flex-wrap: wrap; }
.metric { background: var(--bg-secondary); border-radius: var(--radius); padding: 10px 16px; text-align: center; min-width: 72px; }
.metric-label { font-size: 11px; color: var(--text-secondary); margin-bottom: 2px; }
.metric-value { font-size: 20px; font-weight: 500; color: var(--text-primary); }
.metric-value.good { color: var(--text-success); }
.metric-value.bad  { color: var(--text-danger); }
.metric-value.timer-warn   { color: var(--text-warning); }
.metric-value.timer-danger { color: var(--text-danger); }

/* Font size control */
.fontsize-row { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.fontsize-row button { padding: 5px 10px; font-size: 13px; }
.fontsize-label { font-size: 12px; color: var(--text-secondary); min-width: 38px; text-align: center; }

/* Progress */
.progress-row { display: flex; gap: 8px; align-items: center; font-size: 12px; color: var(--text-secondary); margin-bottom: 12px; }
.progress-bar-wrap { flex: 1; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.progress-bar { height: 4px; background: var(--fill-accent); border-radius: 2px; transition: width 0.3s; }

/* Text display */
.text-area-wrap { background: var(--bg-secondary); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1.5rem; line-height: 2.4; text-align: left; font-size: 1.06em; }

/* Word display (letter-fill) */
.word-display { font-size: 1em; font-family: var(--font-mono); font-weight: 500; color: var(--text-primary); display: inline; }
.word-display.current { border-bottom: 2px solid #7f77dd; padding-bottom: 1px; }
.word-display.end-missed { font-weight: 700; }

/* Controls */
.controls { display: flex; gap: 10px; margin: 1.25rem 0; flex-wrap: wrap; align-items: center; }
.controls input[type=text] { flex: 1; min-width: 160px; max-width: 260px; }
.pts-badge { font-size: 0.69em; font-weight: 500; padding: 2px 7px; border-radius: 99px; background: var(--bg-secondary); color: var(--text-secondary); margin-left: 4px; }
.time-bonus { font-size: 0.75em; color: var(--text-secondary); margin-top: 2px; }

/* Auto-reveal bar */
.auto-reveal-bar-wrap { height: 4px; background: var(--bg-secondary); border-radius: 2px; margin-top: 8px; overflow: hidden; display: none; }
.auto-reveal-bar { height: 4px; background: #7f77dd; border-radius: 2px; width: 100%; }

/* Suggestions */
.sug-label { font-size: 0.75em; color: var(--text-secondary); margin: 8px 0 4px; }
.sug-row { display: flex; flex-wrap: wrap; gap: 7px; min-height: 34px; }
.sug-btn { font-size: 0.81em; font-family: var(--font-mono); padding: 5px 11px; border-radius: var(--radius); border: 0.5px solid var(--border-strong); background: var(--bg-primary); color: var(--text-primary); cursor: pointer; transition: background 0.12s, opacity 0.15s; }
.sug-btn:hover { background: var(--bg-secondary); }
.sug-btn.wrong-flash { background: var(--bg-danger); border-color: #d85a30; color: var(--text-danger); }
.sug-btn.loading { opacity: 0.45; pointer-events: none; font-style: italic; }

/* Feedback */
.feedback-msg { font-size: 0.81em; min-height: 18px; margin-top: 4px; }
.feedback-msg.good { color: var(--text-success); }
.feedback-msg.bad  { color: var(--text-danger); }
.feedback-msg.warn { color: var(--text-warning); }

/* Ordering: slots */
.main-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 560px) { .main-layout { grid-template-columns: 1fr; } }
.panel-label { font-size: 11px; font-weight: 500; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }

.slot { border: 1.5px dashed var(--border-strong); border-radius: var(--radius); padding: 10px 12px; min-height: 52px; margin-bottom: 8px; transition: border-color 0.12s, background 0.12s; }
.slot.drag-over     { border-color: var(--border-accent); background: var(--bg-accent); }
.slot.filled-correct { border-style: solid; border-color: var(--border-success); background: var(--bg-success); }
.slot.filled-wrong   { border-style: solid; border-color: var(--border-danger);  background: var(--bg-danger); }
.slot-number { font-size: 11px; font-weight: 500; color: var(--text-muted); margin-bottom: 4px; }
.slot-text   { font-size: 0.88em; color: var(--text-primary); line-height: 1.5; }
.slot-empty-hint { font-size: 0.88em; color: var(--text-muted); font-style: italic; }
.slot-badge { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; margin-top: 5px; padding: 2px 8px; border-radius: 99px; }
.slot-badge.correct { background: var(--bg-success); color: var(--text-success); }
.slot-badge.wrong   { background: var(--bg-danger);  color: var(--text-danger); }

/* Ordering: source cards */
.source-list { display: flex; flex-direction: column; gap: 8px; }
.source-card { background: var(--bg-secondary); border: 0.5px solid var(--border); border-radius: var(--radius-lg); padding: 10px 14px; cursor: grab; user-select: none; line-height: 1.6; font-size: 0.9em; color: var(--text-primary); transition: opacity 0.15s, border-color 0.15s; }
.source-card:hover   { border-color: var(--border-strong); }
.source-card.dragging { opacity: 0.35; }
.source-card.placed   { opacity: 0.3; pointer-events: none; text-decoration: line-through; }

/* Sentence assembly chunks */
.chunk-btn { font-size: 1em; padding: 7px 14px; border-radius: var(--radius); border: 0.5px solid var(--border-strong); background: var(--bg-primary); color: var(--text-primary); cursor: pointer; margin: 4px; }
.chunk-btn:hover { background: var(--bg-secondary); }
.chunk-btn.wrong-flash { background: var(--bg-danger); border-color: #d85a30; color: var(--text-danger); }
.built-sentence { min-height: 2.4em; line-height: 2.4; font-size: 1.06em; padding: 1rem 1.25rem; background: var(--bg-secondary); border-radius: var(--radius-lg); margin-bottom: 1rem; }
.built-sentence .placed { color: var(--text-success); font-weight: 500; }
.chunk-bank { display: flex; flex-wrap: wrap; margin-bottom: 1rem; }

/* End screen */
.end-item { border-radius: var(--radius); padding: 10px 14px; margin-bottom: 8px; font-size: 0.9em; line-height: 1.6; border: 0.5px solid var(--border); }
.end-item.correct { border-color: var(--border-success); background: var(--bg-success); }
.end-item.wrong   { border-color: var(--border-danger);  background: var(--bg-danger); }
.end-item-label { font-size: 11px; font-weight: 500; margin-bottom: 4px; }
.end-item.correct .end-item-label { color: var(--text-success); }
.end-item.wrong   .end-item-label { color: var(--text-danger); }