:root {
  color-scheme: light;
  --accent: #2a5bff;
  --accent-hover: #1e4acc;
  --fg: #1a1a1a;
  --fg-muted: #5a5a5a;
  --fg-faint: #8a8a8a;
  --bg: #f7f7f5;
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --border: #e4e4e2;
  --border-strong: #cfcfcd;
  --header-bg: #f5f6f9;
  --row-stripe: #fafafa;
  --ok-fg: #137a3b;
  --warn-fg: #b97a00;
  --canvas-bg: #f0f0ee;
  --checker-a: #ebebe9;
  --checker-b: #ffffff;
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font-sans); background: var(--bg); color: var(--fg); line-height: 1.7; min-height: 100vh; }

.app-header {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px; background: var(--card-bg); border-bottom: 1px solid var(--border);
}
.app-header h1 { font-size: 1rem; margin: 0; font-weight: 500; color: var(--fg-muted); }
.app-header .back { color: var(--fg); text-decoration: none; font-size: .9rem; }
.app-header .back:hover { color: var(--accent); }

.app-wrapper { max-width: 1180px; margin: 0 auto; padding: 28px 20px 60px; }
.lede { margin: 0 0 24px; color: var(--fg-muted); font-size: .95rem; }
.lede strong { color: var(--fg); }

.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px 24px; box-shadow: 0 1px 3px rgba(0,0,0,.04); margin-bottom: 18px;
}
.card-title {
  display: flex; align-items: center; gap: 10px;
  margin: 0 0 14px; font-size: 1.05rem; color: var(--fg);
}
.card-sub { margin: -6px 0 14px; color: var(--fg-muted); font-size: .88rem; }
.card-sub strong { color: var(--fg); }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: .85rem; font-weight: 700;
}

.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: 12px; padding: 28px 16px; text-align: center; cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
  background: #fcfcfc;
}
.dropzone:hover, .dropzone:focus { outline: none; border-color: var(--accent); background: #f5f8ff; }
.dropzone.dragging { border-color: var(--accent); background: #eef3ff; }
.dz-inner { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.dz-icon { font-size: 1.8rem; }
.dz-main { font-size: 1rem; color: var(--fg); }
.dz-main strong { color: var(--accent); }
.dz-sub { font-size: .82rem; color: var(--fg-muted); }
.link-btn { background: none; border: none; color: var(--accent); cursor: pointer; padding: 4px 0; margin-top: 4px; font-size: .9rem; text-decoration: underline; }
.link-btn:hover { color: var(--accent-hover); }

.file-meta { margin-top: 12px; padding: 10px 14px; background: #f5f8ff; border: 1px solid #d6e2ff; border-radius: 8px; font-size: .88rem; color: var(--fg); }
.file-meta strong { font-family: var(--font-mono); }
.file-meta .dot { color: var(--fg-faint); margin: 0 8px; }

.pick-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 290px;
  gap: 18px; align-items: flex-start;
}
.canvas-wrap {
  position: relative;
  background: var(--canvas-bg);
  background-image:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  border: 1px solid var(--border); border-radius: 10px;
  overflow: auto; max-height: 70vh; min-height: 280px;
  display: flex; align-items: flex-start; justify-content: flex-start;
}
#imgCanvas { display: block; cursor: crosshair; image-rendering: pixelated; }
.cursor-ring {
  position: fixed; width: 18px; height: 18px; pointer-events: none;
  border: 2px solid #fff; border-radius: 50%;
  box-shadow: 0 0 0 1px #000, 0 0 4px rgba(0,0,0,.3);
  transform: translate(-50%, -50%); z-index: 50;
}
.loupe {
  position: fixed; width: 130px; height: 130px;
  border-radius: 50%; overflow: hidden;
  border: 2px solid #fff; box-shadow: 0 0 0 1px #000, 0 6px 18px rgba(0,0,0,.25);
  pointer-events: none; z-index: 51; background: #888;
}
.loupe canvas { display: block; image-rendering: pixelated; }
.loupe-cross {
  position: absolute; left: 50%; top: 50%; width: 16px; height: 16px;
  transform: translate(-50%, -50%);
  background:
    linear-gradient(transparent 7px, rgba(255,255,255,.9) 7px 9px, transparent 9px),
    linear-gradient(90deg, transparent 7px, rgba(255,255,255,.9) 7px 9px, transparent 9px);
  outline: 1px solid rgba(0,0,0,.4);
}

.pick-side { display: flex; flex-direction: column; gap: 14px; }
.hover-block {
  border: 1px solid var(--border); border-radius: 10px; padding: 12px;
  background: var(--header-bg);
}
.hover-label { font-size: .76rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 8px; }
.hover-row { display: flex; gap: 12px; align-items: stretch; }
.hover-swatch {
  width: 64px; height: 64px; border-radius: 8px; flex: 0 0 64px;
  border: 1px solid var(--border-strong);
  background: #fff;
  background-image:
    linear-gradient(45deg, #ccc 25%, transparent 25%),
    linear-gradient(-45deg, #ccc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ccc 75%),
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0px;
}
.hover-codes { flex: 1; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.code-row { display: flex; align-items: center; gap: 8px; font-size: .85rem; min-width: 0; }
.code-row .code-label {
  display: inline-block; width: 38px; flex: 0 0 38px;
  font-size: .68rem; font-weight: 700; color: var(--fg-muted); letter-spacing: .05em;
}
.code-row code {
  flex: 1; font-family: var(--font-mono); font-size: .85rem; color: var(--fg);
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 5px;
  padding: 3px 7px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.code-row.meta code { font-size: .78rem; color: var(--fg-muted); background: transparent; border: none; padding: 3px 0; }
.hover-hint { margin-top: 8px; font-size: .78rem; color: var(--fg-faint); }

.zoom-block {
  display: flex; flex-direction: column; gap: 8px;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--card-bg);
}
.zoom-row { display: flex; align-items: center; gap: 8px; }
.zoom-row input[type=range] { flex: 1; min-width: 0; accent-color: var(--accent); }
.zoom-presets { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.zoom-preset-buttons { display: flex; gap: 6px; flex-wrap: wrap; }
.zoom-value {
  font-family: var(--font-mono); font-size: .82rem;
  color: var(--fg-muted); font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.icon-btn {
  width: 32px; height: 32px; padding: 0; flex: 0 0 32px;
  background: transparent; color: var(--fg); border: 1px solid var(--border-strong);
  border-radius: 8px; font-size: 1.05rem; font-weight: 600; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); background: transparent; }
button.mini { padding: 6px 12px; font-size: .8rem; white-space: nowrap; }

.options-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; padding: 0 4px; }
.inline { display: inline-flex; align-items: center; gap: 6px; font-size: .86rem; color: var(--fg-muted); }
.inline input[type=checkbox] { accent-color: var(--accent); width: 15px; height: 15px; }

button {
  padding: 10px 20px; border: none; border-radius: 10px; font-size: .95rem;
  font-weight: 600; font-family: inherit; cursor: pointer;
  transition: background-color .15s, color .15s, border-color .15s;
  background: var(--accent); color: #fff;
}
button:hover { background: var(--accent-hover); }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button.ghost:hover { background: var(--accent); color: #fff; }
button.subtle { color: var(--fg-muted); border-color: var(--border-strong); }
button.subtle:hover { color: var(--fg); border-color: var(--fg-muted); background: transparent; }
button:disabled { opacity: .5; cursor: not-allowed; }
.button-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

.palette-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 10px;
  margin-bottom: 4px;
}
.palette-cell {
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
  background: var(--card-bg); display: flex; flex-direction: column;
  position: relative; transition: transform .12s ease, box-shadow .12s ease;
}
.palette-cell:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,.08); }
.palette-cell .pc-swatch { height: 60px; cursor: pointer; position: relative; }
.palette-cell .pc-swatch::after {
  content: 'クリックでHEXコピー'; position: absolute; left: 0; right: 0; bottom: 0;
  padding: 2px 4px; font-size: .65rem; text-align: center; color: #fff;
  background: rgba(0,0,0,.45); opacity: 0; transition: opacity .15s ease;
}
.palette-cell .pc-swatch:hover::after { opacity: 1; }
.palette-cell.copied .pc-swatch::after { content: '✓ コピーしました'; background: rgba(19,122,59,.85); opacity: 1; }
.palette-cell .pc-codes { padding: 6px 8px; display: flex; flex-direction: column; gap: 2px; font-size: .76rem; }
.palette-cell .pc-hex { font-family: var(--font-mono); font-weight: 700; color: var(--fg); }
.palette-cell .pc-rgb { font-family: var(--font-mono); color: var(--fg-muted); font-size: .72rem; }
.palette-cell .pc-close {
  position: absolute; top: 4px; right: 4px;
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(0,0,0,.55); color: #fff;
  border: none; cursor: pointer; font-size: .9rem; line-height: 1; padding: 0;
  opacity: 0; transition: opacity .15s ease;
}
.palette-cell:hover .pc-close { opacity: 1; }
.palette-cell .pc-close:hover { background: rgba(0,0,0,.8); }
.empty-msg { color: var(--fg-muted); font-size: .88rem; padding: 14px 4px; margin: 0; text-align: center; }

.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px; margin-bottom: 18px;
}
.stat-tile {
  background: var(--header-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px;
}
.stat-tile .stat-label { font-size: .72rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: .04em; }
.stat-tile .stat-value { font-size: 1.2rem; font-weight: 700; color: var(--fg); font-variant-numeric: tabular-nums; word-break: break-all; }
.stat-tile .stat-sub { font-size: .78rem; color: var(--fg-muted); margin-top: 2px; }
.stat-tile.swatch-tile { display: flex; align-items: center; gap: 12px; }
.stat-tile.swatch-tile .stat-swatch {
  width: 42px; height: 42px; flex: 0 0 42px; border-radius: 8px;
  border: 1px solid var(--border-strong);
}

.action-heading { font-size: 1rem; margin: 22px 0 6px; color: var(--fg); }

.dominant-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px;
}
.dominant-cell {
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
  background: var(--card-bg); cursor: pointer; transition: transform .12s ease, box-shadow .12s ease;
}
.dominant-cell:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,.08); border-color: var(--accent); }
.dominant-cell .dc-bar { height: 50px; }
.dominant-cell .dc-meta { padding: 6px 8px; display: flex; flex-direction: column; gap: 2px; font-size: .76rem; }
.dominant-cell .dc-hex { font-family: var(--font-mono); font-weight: 700; color: var(--fg); }
.dominant-cell .dc-pct { font-family: var(--font-mono); color: var(--fg-muted); font-size: .72rem; }

.hue-bar {
  display: flex; align-items: flex-end; gap: 1px;
  height: 90px; padding: 4px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--header-bg);
  overflow: hidden;
}
.hue-bar .hue-tick { flex: 1; min-width: 0; border-radius: 1px; transition: filter .15s ease; }
.hue-bar .hue-tick:hover { filter: brightness(1.12); }

.lum-hist {
  display: flex; align-items: flex-end; gap: 1px;
  height: 80px; padding: 4px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--header-bg);
  background-image: linear-gradient(to right, #000, #fff);
  overflow: hidden;
}
.lum-hist .lum-tick { flex: 1; min-width: 0; background: rgba(42,91,255,.78); border-radius: 1px 1px 0 0; }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 12px);
  padding: 10px 18px; border-radius: 999px;
  background: rgba(30,30,30,.92); color: #fff; font-size: .88rem;
  opacity: 0; transition: opacity .18s ease, transform .18s ease;
  pointer-events: none; z-index: 9998;
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.about-app {
  margin: 28px 0 0;
}
.about-app > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 10px;
  font-size: .92rem; font-weight: 600;
  transition: background-color .15s, color .15s;
}
.about-app > summary::-webkit-details-marker { display: none; }
.about-app > summary::before {
  content: '▶';
  font-size: .7rem;
  transition: transform .15s ease;
  color: var(--accent);
  display: inline-block;
}
.about-app[open] > summary::before { transform: rotate(90deg); }
.about-app > summary:hover { background: var(--accent); color: #fff; }
.about-app > summary:hover::before { color: #fff; }
.about-app > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.about-app .about-body { padding-top: 4px; }
.about-app .about-body > h2:first-child { border-top: none; padding-top: 8px; margin-top: 16px; }

.wp-content { margin: 40px 0 0; color: var(--fg-muted); line-height: 1.9; }
.wp-content h2 {
  font-size: 1.1rem; color: var(--fg); margin: 24px 0 10px;
  padding-top: 16px; border-top: 1px solid var(--border);
}
.wp-content h3 { font-size: .98rem; color: var(--fg); margin: 18px 0 6px; font-weight: 600; }
.wp-content p { margin: 0 0 12px; }
.wp-content ul { padding-left: 1.4em; }
.wp-content code { background: #eef; padding: 1px 6px; border-radius: 3px; font-size: .88em; font-family: var(--font-mono); }
.wp-content strong { color: var(--fg); }

@media (max-width: 880px) {
  .pick-layout { grid-template-columns: 1fr; }
  .pick-side { order: 2; }
  .canvas-wrap { order: 1; max-height: 55vh; }
}
@media (max-width: 720px) {
  .app-wrapper { padding: 20px 14px 40px; }
  .card { padding: 18px 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .palette-grid { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); }
  .dominant-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .loupe { display: none !important; }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121212;
  --card-bg: #1d1d1d;
  --input-bg: #2a2a2a;
  --fg: #f0f0f0;
  --fg-muted: #a0a0a0;
  --fg-faint: #666;
  --border: #2a2a2a;
  --border-strong: #3a3a3a;
  --row-stripe: #181818;
  --header-bg: #232323;
  --canvas-bg: #1a1a1a;
  --checker-a: #232323;
  --checker-b: #1a1a1a;
  --accent: #5a82ff;
  --accent-hover: #2a5bff;
  --ok-fg: #4ade80;
}
:root[data-theme="dark"] .dropzone { background: #1a1a1a; }
:root[data-theme="dark"] .dropzone:hover { background: #1f2436; }
:root[data-theme="dark"] .file-meta { background: #1f2436; border-color: #2c3a5a; }
:root[data-theme="dark"] .wp-content code { background: #2a2a3a; color: #e0e0ff; }
:root[data-theme="dark"] .hover-swatch {
  background-image:
    linear-gradient(45deg, #444 25%, transparent 25%),
    linear-gradient(-45deg, #444 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #444 75%),
    linear-gradient(-45deg, transparent 75%, #444 75%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121212;
    --card-bg: #1d1d1d;
    --input-bg: #2a2a2a;
    --fg: #f0f0f0;
    --fg-muted: #a0a0a0;
    --fg-faint: #666;
    --border: #2a2a2a;
    --border-strong: #3a3a3a;
    --row-stripe: #181818;
    --header-bg: #232323;
    --canvas-bg: #1a1a1a;
    --checker-a: #232323;
    --checker-b: #1a1a1a;
    --accent: #5a82ff;
    --accent-hover: #2a5bff;
    --ok-fg: #4ade80;
  }
  :root:not([data-theme="light"]) .dropzone { background: #1a1a1a; }
  :root:not([data-theme="light"]) .dropzone:hover { background: #1f2436; }
  :root:not([data-theme="light"]) .file-meta { background: #1f2436; border-color: #2c3a5a; }
  :root:not([data-theme="light"]) .wp-content code { background: #2a2a3a; color: #e0e0ff; }
}

.owt-theme-toggle {
  position: fixed; top: 10px; right: 12px; z-index: 9999;
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; padding: 0;
  border: 1px solid rgba(127, 127, 127, 0.4); border-radius: 999px;
  background: rgba(255, 255, 255, 0.85); color: #333;
  cursor: pointer; font-size: 1.05rem; line-height: 1;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.owt-theme-toggle:hover { transform: translateY(-1px); border-color: rgba(127, 127, 127, 0.7); }
.owt-theme-toggle:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }
:root[data-theme="dark"] .owt-theme-toggle { background: rgba(40, 40, 40, 0.85); color: #eee; border-color: rgba(200, 200, 200, 0.25); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .owt-theme-toggle { background: rgba(40, 40, 40, 0.85); color: #eee; border-color: rgba(200, 200, 200, 0.25); }
}
@media print { .owt-theme-toggle { display: none; } }