:root {
  --color-bg: #f7f6f2;
  --color-fg: #1a1a1a;
  --color-line: #2a2a2a;
  --color-accent: #b03020;
  --color-muted: #777;
  --color-cell-bg: #ffffff;
  --color-cell-border: #b0b0b0;
  --color-cell-bold: #2a2a2a;
  --color-filled: #1a1a1a;
  --color-cross: #b03020;
  --color-hint-bg: #f0ece2;
  --color-panel-bg: #ffffff;
  --color-panel-border: #ddd;
  --color-input-bg: #ffffff;
  --cell-size: 32px;
}

body.theme-dark {
  --color-bg: #1a1d24;
  --color-fg: #e8e8e8;
  --color-line: #4a5060;
  --color-accent: #e84a35;
  --color-muted: #9aa0ac;
  --color-cell-bg: #2a2f3a;
  --color-cell-border: #4a5060;
  --color-cell-bold: #aab0c0;
  --color-filled: #e8e8e8;
  --color-cross: #e84a35;
  --color-hint-bg: #3a3530;
  --color-panel-bg: #232730;
  --color-panel-border: #3a3f4a;
  --color-input-bg: #2a2f3a;
}

* { box-sizing: border-box; }

:root { color-scheme: light; }
body.theme-dark { color-scheme: dark; }

html, body {
  margin: 0; padding: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font: 15px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
}
html { min-height: 100%; background: var(--color-bg); }
body { min-height: 100vh; }
/* Тёмный фон должен покрывать viewport даже когда body короче экрана. */
body.theme-dark { background: var(--color-bg); }
html:has(body.theme-dark) {
  background: #1a1d24;
}

.controls {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  background: var(--color-panel-bg);
  border-bottom: 1px solid var(--color-panel-border);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}
.topbar-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}
.topbar-controls select,
.topbar-controls button {
  font-size: 13px;
  padding: 6px 10px;
}
.app-title { margin: 0 0 4px; font-size: 22px; font-weight: 700; }
.app-sub { margin: 0 0 14px; color: var(--color-muted); font-size: 14px; }

.ctrl-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.ctrl-row label {
  font-size: 13px;
  color: var(--color-muted);
}
select, button {
  padding: 8px 14px;
  font-size: 14px;
  font-family: inherit;
  background: var(--color-input-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  cursor: pointer;
}
button:hover { filter: brightness(1.06); }
button:active { filter: brightness(0.94); }
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  font-weight: 600;
}
.btn-primary:hover { background: #8e2519; border-color: #8e2519; }
.btn-subtle { font-size: 13px; opacity: 0.78; border-color: var(--color-panel-border); }
.btn-subtle:hover { opacity: 1; }

.status {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--color-muted);
  min-height: 22px;
}

main {
  max-width: 1100px;
  margin: 24px auto 60px;
  padding: 0 24px;
}

.error-msg {
  text-align: center;
  padding: 24px;
  background: #fde9e6;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  color: #6a1810;
}

/* ===== Board layout ===== */

.nono-board {
  display: inline-grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto;
  background: var(--color-panel-bg);
  border: 2px solid var(--color-cell-bold);
  user-select: none;
}

.nono-corner {
  background: var(--color-hint-bg);
  border-right: 1px solid var(--color-cell-bold);
  border-bottom: 1px solid var(--color-cell-bold);
}

.nono-col-hints {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell-size));
  background: var(--color-hint-bg);
  border-bottom: 1px solid var(--color-cell-bold);
}
.nono-row-hints {
  display: grid;
  grid-template-rows: repeat(var(--rows), var(--cell-size));
  background: var(--color-hint-bg);
  border-right: 1px solid var(--color-cell-bold);
}

.nono-hint {
  display: flex;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-fg);
  padding: 2px 4px;
  line-height: 1.2;
  border-right: 1px solid var(--color-cell-border);
  border-bottom: 1px solid var(--color-cell-border);
}
.nono-hint-col {
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  width: var(--cell-size);
  min-height: calc(var(--cell-size) * 2);
  border-bottom: none;
}
.nono-hint-row {
  flex-direction: row;
  justify-content: flex-end;
  align-items: center;
  height: var(--cell-size);
  min-width: calc(var(--cell-size) * 2);
  border-right: none;
  gap: 4px;
}
.nono-hint-zero { color: var(--color-muted); font-style: italic; }

.nono-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell-size));
  grid-template-rows: repeat(var(--rows), var(--cell-size));
  background: var(--color-cell-bg);
}
.nono-cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid var(--color-cell-border);
  background: var(--color-cell-bg);
  position: relative;
  cursor: pointer;
  transition: background 0.05s;
}
.nono-cell:hover { background: rgba(176, 48, 32, 0.08); }
.nono-cell.right-bold { border-right: 2px solid var(--color-cell-bold); }
.nono-cell.bottom-bold { border-bottom: 2px solid var(--color-cell-bold); }

.nono-cell.filled {
  background: var(--color-filled);
}
.nono-cell.crossed::before,
.nono-cell.crossed::after {
  content: '';
  position: absolute;
  top: 50%; left: 10%;
  width: 80%; height: 2px;
  background: var(--color-cross);
}
.nono-cell.crossed::before { transform: rotate(45deg); }
.nono-cell.crossed::after { transform: rotate(-45deg); }

.nono-cell.error {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
  z-index: 1;
}

/* Показ решения — серая заливка ожидаемых клеток */
.nono-grid.nono-show-solution .nono-cell.solution-filled {
  background: rgba(0, 0, 0, 0.18);
}
.nono-grid.nono-show-solution .nono-cell.solution-filled.filled {
  background: var(--color-filled);
}

/* ===== Панель импорта картинки ===== */

.import-panel {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 6px;
}
.import-title {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
}
.import-body {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 760px) {
  .import-body { grid-template-columns: 1fr; }
}
.import-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.import-label {
  font-size: 12px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
#import-preview-orig {
  max-width: 100%;
  max-height: 240px;
  object-fit: contain;
  background: var(--color-panel-bg);
  background-image: repeating-conic-gradient(rgba(128,128,128,0.15) 0% 25%, transparent 0% 50%);
  background-size: 16px 16px;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
}
#import-preview-canvas {
  max-width: 100%;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  background: #fff;
}
.import-stats {
  font-size: 12px;
  color: var(--color-muted);
}
.import-controls label {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 4px;
}
.import-controls label input[type="text"],
.import-controls label select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 6px 10px;
  font-size: 14px;
  background: var(--color-input-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  font-family: inherit;
}
.import-controls label input[type="range"] {
  width: 100%;
  margin-top: 4px;
}
.import-controls label input[type="checkbox"] {
  margin-right: 6px;
}
.import-actions {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

/* ===== Редактор паззлов ===== */

body.mode-editor .controls,
body.mode-editor main { display: none; }

.editor-panel {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 60px;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-panel-border);
}
.editor-toolbar select {
  padding: 6px 10px;
  font-size: 14px;
  font-family: inherit;
  background: var(--color-input-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
}
.editor-toolbar-spacer { flex: 1; }
.editor-readonly-tag {
  font-size: 12px;
  padding: 2px 8px;
  background: var(--color-cell-border);
  color: var(--color-fg);
  opacity: 0.7;
  border-radius: 3px;
}

.editor-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: end;
  margin-bottom: 12px;
}
.editor-meta label {
  display: flex;
  flex-direction: column;
  font-size: 12px;
  color: var(--color-muted);
  gap: 4px;
}
.editor-meta input {
  padding: 6px 10px;
  font-size: 14px;
  font-family: inherit;
  background: var(--color-input-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  width: 200px;
}
.editor-meta input[type="number"] { width: 80px; }

.editor-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 18px;
  align-items: start;
  margin-bottom: 16px;
}
@media (max-width: 880px) {
  .editor-body { grid-template-columns: 1fr; }
}

.editor-canvas-wrap {
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 6px;
  padding: 12px;
}
.editor-canvas-hint {
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 10px;
}
.editor-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 10), var(--cell-size, 24px));
  grid-template-rows: repeat(var(--rows, 10), var(--cell-size, 24px));
  border: 2px solid var(--color-cell-bold);
  background: var(--color-cell-bg);
  user-select: none;
  width: max-content;
}
.editor-cell {
  width: var(--cell-size, 24px);
  height: var(--cell-size, 24px);
  border: 1px solid var(--color-cell-border);
  background: var(--color-cell-bg);
  cursor: crosshair;
}
.editor-cell:hover { background: rgba(176, 48, 32, 0.1); }
.editor-cell.filled { background: var(--color-filled); }
.editor-cell.right-bold { border-right: 2px solid var(--color-cell-bold); }
.editor-cell.bottom-bold { border-bottom: 2px solid var(--color-cell-bold); }

.editor-side {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 6px;
}
.editor-stats {
  font-size: 13px;
  font-family: monospace;
  color: var(--color-muted);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--color-panel-border);
}
.editor-uniqueness {
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 4px;
  min-height: 20px;
}
.editor-uniqueness.unique { background: #e6f6e6; color: #1a5a1a; }
.editor-uniqueness.ambiguous { background: #fdeecf; color: #6a4a10; }
.editor-uniqueness.timeout { background: #f0f0f0; color: var(--color-muted); }
.editor-uniqueness.error { background: #fde9e6; color: var(--color-accent); }
body.theme-dark .editor-uniqueness.unique { background: #1a3a1a; color: #aaffaa; }
body.theme-dark .editor-uniqueness.ambiguous { background: #4a3520; color: #ffd070; }

.editor-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--color-panel-border);
}
.editor-status {
  font-size: 13px;
  margin-left: 12px;
}
.editor-status.ok { color: #2a7a2a; }
.editor-status.err { color: var(--color-accent); }
.import-uniqueness {
  margin-top: 8px;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 4px;
}
.import-uniqueness.unique { background: #e6f6e6; color: #1a5a1a; }
.import-uniqueness.ambiguous { background: #fdeecf; color: #6a4a10; }
.import-uniqueness.timeout { background: #f0f0f0; color: var(--color-muted); }
.import-uniqueness.error { background: #fde9e6; color: var(--color-accent); }
body.theme-dark .import-uniqueness.unique { background: #1a3a1a; color: #aaffaa; }
body.theme-dark .import-uniqueness.ambiguous { background: #4a3520; color: #ffd070; }
body.theme-dark .import-uniqueness.timeout { background: #2a2f3a; }