/* ヨコ割り — カッターマットをモチーフにしたダークUI */

:root {
  --bg: #131513;
  --bg-raise: #1a1d1a;
  --mat: #1e2b24;
  --mat-grid: #2e4034;
  --mat-edge: #3a5244;
  --ink: #eaece6;
  --ink-dim: #9aa49b;
  --guide: #e8c547;      /* カッターガイドの黄色 */
  --guide-dim: #b39a3a;
  --danger: #e07a5f;
  --radius: 10px;
  --font-body: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --font-mono: "Consolas", "SF Mono", "Menlo", monospace;
}

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

html { color-scheme: dark; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 32px;
}

/* ---------- ヘッダー ---------- */

.header { margin-bottom: 36px; }

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.brand-mark {
  display: inline-flex;
  flex-shrink: 0;
}
.brand-mark svg {
  width: 44px;
  height: 44px;
  display: block;
}

.tagline {
  margin-top: 8px;
  color: var(--ink-dim);
  font-size: 0.95rem;
}

/* ---------- ドロップゾーン ---------- */

.dropzone {
  position: relative;
  border-radius: var(--radius);
  background:
    linear-gradient(var(--mat-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--mat-grid) 1px, transparent 1px),
    var(--mat);
  background-size: 28px 28px, 28px 28px, auto;
  border: 1px solid var(--mat-edge);
  outline: none;
  cursor: pointer;
  padding: 72px 24px;
  text-align: center;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--guide);
  box-shadow: 0 0 0 1px var(--guide);
}

.dropzone.is-dragover {
  border-color: var(--guide);
  box-shadow: 0 0 0 2px var(--guide), 0 0 32px rgba(232, 197, 71, 0.15) inset;
}

.dropzone-icon {
  width: 56px;
  height: 56px;
  fill: var(--guide);
  margin-bottom: 16px;
}

.dropzone-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.dropzone-sub {
  margin-top: 6px;
  color: var(--ink-dim);
  font-size: 0.9rem;
}

.dropzone-formats {
  margin-top: 18px;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
  border: 1px solid var(--mat-edge);
  border-radius: 99px;
  padding: 2px 14px;
  background: rgba(0, 0, 0, 0.25);
}

/* ---------- コントロール ---------- */

.workspace { margin-top: 8px; }

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: 16px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--mat-edge);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-raise);
}

.seg-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 8px 18px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.seg-btn small {
  font-weight: 400;
  font-size: 0.7rem;
  margin-left: 4px;
  opacity: 0.8;
}

.seg-btn + .seg-btn { border-left: 1px solid var(--mat-edge); }

.seg-btn:hover { color: var(--ink); }

.seg-btn.is-active {
  background: var(--guide);
  color: #1c1a10;
}

.seg-btn:focus-visible {
  outline: 2px solid var(--guide);
  outline-offset: -2px;
}

.text-btn {
  appearance: none;
  border: none;
  background: none;
  color: var(--ink-dim);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 8px 0;
  margin-left: auto;
}
.text-btn:hover { color: var(--ink); }
.text-btn:focus-visible { outline: 2px solid var(--guide); outline-offset: 2px; }

/* ---------- プレビュー（カッターマット） ---------- */

.mat {
  border-radius: var(--radius);
  border: 1px solid var(--mat-edge);
  background:
    linear-gradient(var(--mat-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--mat-grid) 1px, transparent 1px),
    var(--mat);
  background-size: 28px 28px, 28px 28px, auto;
  padding: 24px;
}

.preview-wrap {
  display: flex;
  justify-content: center;
}

#preview-canvas {
  max-width: 100%;
  height: auto;
  display: block;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
}

/* ---------- メタ情報 ---------- */

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
  margin-top: 10px;
}

.meta {
  color: var(--ink-dim);
  font-size: 0.8rem;
}

.mono { font-family: var(--font-mono); }

.warning {
  margin-top: 10px;
  color: var(--danger);
  font-size: 0.85rem;
  border-left: 3px solid var(--danger);
  padding-left: 10px;
}

/* ---------- ピース一覧 ---------- */

.pieces {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.piece {
  background: var(--bg-raise);
  border: 1px solid var(--mat-edge);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.piece-thumb {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
  background: #000;
}

.piece-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.piece-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--guide);
  font-size: 0.95rem;
}

.piece-size {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-dim);
}

.piece-dl {
  appearance: none;
  border: 1px solid var(--mat-edge);
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: 0.8rem;
  padding: 6px 0;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.piece-dl:hover { border-color: var(--guide); color: var(--guide); }
.piece-dl:focus-visible { outline: 2px solid var(--guide); outline-offset: 2px; }

/* ---------- ダウンロード ---------- */

.download-row {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.primary-btn {
  appearance: none;
  border: none;
  border-radius: 8px;
  background: var(--guide);
  color: #1c1a10;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 13px 32px;
  cursor: pointer;
  transition: filter 0.12s, transform 0.08s;
}
.primary-btn:hover { filter: brightness(1.08); }
.primary-btn:active { transform: translateY(1px); }
.primary-btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.share {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}

.share-text {
  color: var(--ink-dim);
  font-size: 0.9rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--mat-edge);
  border-radius: 8px;
  background: var(--bg-raise);
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 12px 24px;
  text-decoration: none;
  transition: border-color 0.12s, color 0.12s;
}
.share-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}
.share-btn:hover { border-color: var(--guide); color: var(--guide); }
.share-btn:focus-visible { outline: 2px solid var(--guide); outline-offset: 2px; }

.download-hint {
  color: var(--ink-dim);
  font-size: 0.85rem;
}

/* ---------- メモ・フッター ---------- */

.notes {
  margin-top: 56px;
  border-top: 1px solid var(--mat-edge);
  padding-top: 24px;
}

.notes-title {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  font-weight: 700;
  margin-bottom: 10px;
}

.notes ul {
  list-style: none;
}

.notes li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--ink-dim);
  margin-bottom: 6px;
}

.notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 3px;
  background: var(--guide);
  border-radius: 1px;
}

.footer {
  margin-top: 48px;
  color: var(--ink-dim);
  font-size: 0.8rem;
}

.footer a { color: var(--ink-dim); }
.footer a:hover { color: var(--guide); }

.footer .credit { margin-top: 4px; }
.footer .credit a { color: var(--guide); text-decoration: none; }
.footer .credit a:hover { text-decoration: underline; }

/* ---------- レスポンシブ・モーション ---------- */

@media (max-width: 560px) {
  .page { padding-top: 32px; }
  .brand { font-size: 1.5rem; }
  .dropzone { padding: 48px 16px; }
  .text-btn { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}