/* ═══════════════════════════════════════════════════════════════
   grid-explorer.css — Maths Grid Explorer
   App-specific styles (shared framework handles header, toolbar, drawer, dark mode)
   ═══════════════════════════════════════════════════════════════ */

/* ── Unified top bar ────────────────────────────────────────────── */
.ge-top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: var(--sm-surface);
  border-bottom: 1px solid var(--sm-border);
  min-height: 36px;
}
.ge-top-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.ge-top-left label {
  font-size: 12px;
  font-weight: 700;
  color: var(--sm-text-muted);
  white-space: nowrap;
}
.ge-top-left select {
  padding: 3px 8px;
  border: 1.5px solid var(--sm-border);
  border-radius: 6px;
  background: var(--sm-surface);
  font-size: 11px;
  font-weight: 600;
  color: var(--sm-text);
  cursor: pointer;
  font-family: var(--sm-font);
}
.ge-top-left select:focus { outline: 2px solid var(--sm-indigo); }

.ge-top-actions {
  display: flex;
  align-items: center;
  gap: 5px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.ge-action-btn {
  padding: 3px 10px;
  border: 1.5px solid var(--sm-border);
  border-radius: 5px;
  background: var(--sm-surface);
  color: var(--sm-text);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--sm-font);
  transition: background 0.15s, border-color 0.15s;
}
.ge-action-btn:hover { background: var(--sm-surface-raised); border-color: var(--sm-text-muted); }
.ge-action-btn.primary { background: var(--sm-text); color: var(--sm-surface); border-color: var(--sm-text); }
.ge-action-btn.primary:hover { opacity: 0.85; }
.ge-action-btn.danger { color: var(--sm-incorrect); border-color: var(--sm-incorrect-bg); }
.ge-action-btn.danger:hover { background: var(--sm-incorrect-bg); border-color: var(--sm-incorrect); }

/* On narrow screens, wrap action buttons below mode selector */
@media (max-width: 860px) {
  .ge-top-bar { flex-wrap: wrap; justify-content: center; }
  .ge-top-actions { width: 100%; order: 1; }
}

/* ── Page layout ───────────────────────────────────────────────── */
.ge-scroll {
  width: 100%;
  height: 100%;
  overflow: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 8px 60px;
}

.ge-page-layout { display: flex; flex-direction: column; align-items: center; }

.ge-axis-x {
  font-size: 11px; font-weight: 700; color: var(--sm-text-muted);
  letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 3px; padding-left: 80px;
  text-align: center; width: 100%;
}
.ge-grid-row { display: flex; align-items: center; gap: 6px; }
.ge-axis-y {
  font-size: 11px; font-weight: 700; color: var(--sm-text-muted);
  letter-spacing: 0.06em; text-transform: uppercase;
  writing-mode: vertical-rl; transform: rotate(180deg);
  white-space: nowrap; flex-shrink: 0;
}

/* ── Outer grid ────────────────────────────────────────────────── */
.ge-outer-grid {
  display: grid;
  grid-template-columns: 80px repeat(3, max-content);
  grid-template-rows: auto auto auto auto;
  gap: 0;
  margin: 0 auto;
  background: var(--sm-border);
  border: 2px solid var(--sm-border);
  border-radius: 10px;
  width: fit-content;
}

/* ── Corner label ──────────────────────────────────────────────── */
.ge-corner-label {
  background: var(--sm-surface); position: relative; overflow: hidden;
  min-height: 50px; min-width: 80px;
}
.ge-corner-label svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.ge-corner-label svg line { stroke: var(--sm-border); }
.ge-corner-label svg text { fill: var(--sm-text-muted); }

/* ── Col / Row labels ──────────────────────────────────────────── */
.ge-col-label {
  background: var(--sm-surface); display: flex;
  align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: var(--sm-text-muted);
  letter-spacing: 0.04em; min-width: 40px;
}
.ge-outer-grid.num-mode .ge-col-label { min-width: 218px; }
.ge-row-label {
  background: var(--sm-surface); display: flex;
  align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: var(--sm-text-muted);
  writing-mode: vertical-rl; transform: rotate(180deg);
  letter-spacing: 0.04em;
}

/* ── Panel ─────────────────────────────────────────────────────── */
.ge-panel {
  background: var(--sm-surface); padding: 8px;
  display: flex; flex-direction: column;
  align-items: center; gap: 6px;
  position: relative; margin: 1px; border-radius: 4px;
  min-width: 200px;
}
.ge-panel.canvas-mode { min-width: unset; padding: 6px; gap: 4px; }
.ge-panel.centre { background: var(--sm-highlight-bg); outline: 2px solid var(--sm-highlight); outline-offset: -2px; }
.ge-panel.centre.locked { background: var(--sm-indigo-light); }
.ge-panel.centre.locked canvas { cursor: not-allowed; border-color: #7090d0; }
.ge-panel.active-panel { outline: 2.5px solid var(--sm-indigo); outline-offset: -2px; }

/* ── Status badge ──────────────────────────────────────────────── */
.ge-badge {
  font-size: 10px; font-weight: 700;
  padding: 2px 7px; border-radius: 10px;
  letter-spacing: 0.03em; min-width: 50px; text-align: center;
}
.ge-badge.ok    { background: var(--sm-correct-bg); color: var(--sm-correct); }
.ge-badge.fail  { background: var(--sm-incorrect-bg); color: var(--sm-incorrect); }
.ge-badge.empty { background: var(--sm-border); color: var(--sm-text-muted); }
.ge-badge.centre-lbl { background: var(--sm-highlight); color: #6b4800; }
.ge-badge.lock-badge { background: var(--sm-text); color: var(--sm-surface); font-size: 10px; }

/* ── Stats ─────────────────────────────────────────────────────── */
.ge-stats { display: flex; gap: 6px; font-size: 10px; color: var(--sm-text-muted); }
.ge-stats span { font-weight: 700; color: var(--sm-text); }

/* ── Canvas (perimeter/area mode) ──────────────────────────────── */
.ge-panel canvas {
  cursor: crosshair; border: 1.5px solid var(--sm-border);
  border-radius: 3px; display: block; touch-action: none;
}
.ge-panel.centre canvas { border-color: var(--sm-highlight); }

/* ── Number input panel (number modes) ─────────────────────────── */
.ge-num-input-area {
  width: 100%; display: flex; flex-direction: column;
  align-items: center; gap: 10px; padding: 16px 8px;
  min-height: 120px; justify-content: center;
}
.ge-num-input-area input[type=number],
.ge-num-input-area input[type=text] {
  width: 90%; padding: 8px 12px;
  border: 1.5px solid var(--sm-border); border-radius: 6px;
  font-size: 16px; text-align: center;
  font-family: var(--sm-font); color: var(--sm-text);
  font-weight: 600; background: var(--sm-surface);
}
.ge-num-input-area input:focus { outline: 2px solid var(--sm-indigo); border-color: var(--sm-indigo); }
.ge-num-input-area .input-label {
  font-size: 10px; color: var(--sm-text-muted); font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.ge-pair-row { display: flex; gap: 8px; width: 90%; }
.ge-pair-row input { flex: 1; }
.ge-set-size-row {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--sm-text-muted);
}
.ge-set-size-row select {
  padding: 2px 6px; border: 1.5px solid var(--sm-border);
  border-radius: 4px; font-size: 11px;
  background: var(--sm-surface); color: var(--sm-text);
  font-family: var(--sm-font);
}
.ge-num-input-area.locked input { background: var(--sm-surface-raised); cursor: not-allowed; }

/* ── Shape picker (inside drawer) ──────────────────────────────── */
.ge-difficulty-group { margin-bottom: 14px; }
.ge-difficulty-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 7px;
  display: flex; align-items: center; gap: 6px;
}
.ge-diff-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
.ge-diff-starter .ge-diff-dot { background: var(--sm-correct); }
.ge-diff-starter { color: var(--sm-correct); }
.ge-diff-medium  .ge-diff-dot { background: var(--sm-highlight); }
.ge-diff-medium  { color: #7a420a; }
.ge-diff-hard    .ge-diff-dot { background: var(--sm-incorrect); }
.ge-diff-hard    { color: var(--sm-incorrect); }

[data-theme="dark"] .ge-diff-medium { color: var(--sm-highlight); }

.ge-shape-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.ge-shape-thumb {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  cursor: pointer; padding: 5px 3px; border-radius: 6px;
  border: 1.5px solid var(--sm-border); background: var(--sm-surface);
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.ge-shape-thumb:hover { border-color: var(--sm-indigo); background: var(--sm-indigo-light); transform: translateY(-1px); }
.ge-shape-thumb.active { border-color: var(--sm-indigo); background: var(--sm-indigo-light); }
.ge-shape-thumb canvas { border: none; border-radius: 2px; cursor: pointer; }
.ge-shape-thumb-name {
  font-size: 9px; font-weight: 600; color: var(--sm-text-muted);
  text-align: center; line-height: 1.2;
}

/* ── Credit strip ──────────────────────────────────────────────── */
.ge-credit-btn {
  position: fixed; bottom: 14px; left: 14px; z-index: 200;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--sm-surface); border: 1.5px solid var(--sm-border);
  color: var(--sm-text-muted); font-size: 12px; font-weight: 700; font-style: italic;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.10);
  transition: border-color 0.15s, color 0.15s;
  font-family: Georgia, serif;
}
.ge-credit-btn:hover { border-color: var(--sm-text-muted); color: var(--sm-text); }

.ge-credit-strip {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 190;
  background: var(--sm-text); color: var(--sm-text-muted);
  font-size: 11px; padding: 0 52px 0 20px;
  height: 0; overflow: hidden;
  display: flex; align-items: center; gap: 6px;
  transition: height 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  font-family: var(--sm-font);
}
.ge-credit-strip.open { height: 32px; }
.ge-credit-strip strong { color: var(--sm-surface); font-weight: 600; }
.ge-credit-strip a { color: #8ab4f8; text-decoration: none; }
.ge-credit-strip a:hover { text-decoration: underline; }