/* Design reminder: 「余白の作業台」— 白、細線、静かな青緑だけで、変換作業の順序を見せる。 */
:root {
  --ink: #1e2a32;
  --ink-soft: #52616a;
  --muted: #8b969c;
  --line: #dde3e5;
  --line-strong: #cbd4d6;
  --paper: #ffffff;
  --quiet: #f7f9f9;
  --accent: #4c7c78;
  --accent-dark: #386661;
  --accent-wash: #edf5f3;
  --danger: #b14b4b;
  --radius-sm: 9px;
  --radius: 13px;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { background: var(--paper); }

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans JP", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button, input, select { font: inherit; }
button, label, select, input[type="range"] { -webkit-tap-highlight-color: transparent; }
button:not(:disabled), label, select, input[type="range"], .drop-zone { cursor: pointer; }
button:disabled { cursor: wait; }

.site-header {
  width: min(100% - 40px, 980px);
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.045em;
  text-decoration: none;
}

.brand-mark {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  color: var(--accent);
}
.brand-mark svg { width: 19px; height: 19px; }
.header-label { color: var(--muted); font-size: 12px; font-weight: 500; }

.page-shell { width: min(100% - 40px, 760px); margin: 0 auto; padding: 76px 0 52px; }
.intro { margin-bottom: 46px; }
.eyebrow { margin: 0 0 10px; color: var(--accent); font-size: 11px; font-weight: 700; letter-spacing: .13em; }
h1 { margin: 0; font-size: clamp(27px, 5vw, 36px); font-weight: 700; line-height: 1.3; letter-spacing: -0.045em; }
.intro > p:not(.eyebrow) { margin: 16px 0 0; color: var(--ink-soft); font-size: 14px; line-height: 1.9; }
.mobile-break { display: none; }

.tool-surface { border-top: 1px solid var(--line-strong); }
.settings { position: relative; border-bottom: 1px solid var(--line); }
.settings::after { content: ""; position: absolute; z-index: 1; bottom: -29px; left: 52px; height: 29px; border-left: 1px solid var(--line-strong); }
.settings::before { content: "01  設定"; position: absolute; top: 8px; left: 0; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 9px; letter-spacing: .04em; }
.setting-row { display: grid; grid-template-columns: 104px minmax(0, 1fr); align-items: center; gap: 20px; min-height: 69px; border-bottom: 1px solid var(--line); }
.setting-row:last-child { border-bottom: 0; }
.setting-label { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--ink-soft); font-size: 13px; font-weight: 500; }
.setting-label output { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; font-weight: 600; }

.format-control { display: inline-grid; grid-template-columns: repeat(3, minmax(0, 100px)); align-self: center; overflow: hidden; width: fit-content; border: 1px solid var(--line-strong); border-radius: 5px; }
.format-control input { position: absolute; inline-size: 1px; block-size: 1px; opacity: 0; pointer-events: none; }
.format-control label { padding: 8px 14px; color: var(--ink-soft); border-right: 1px solid var(--line-strong); font-size: 12px; font-weight: 600; text-align: center; transition: color .16s var(--ease-out), background-color .16s var(--ease-out); }
.format-control label:last-child { border-right: 0; }
.format-control input:checked + label { color: #fff; background: var(--accent); }
.format-control input:focus-visible + label { position: relative; outline: 2px solid var(--ink); outline-offset: -2px; }

.range-wrap { display: grid; grid-template-columns: 25px minmax(100px, 280px) 28px; align-items: center; gap: 9px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 10px; }
input[type="range"] { width: 100%; height: 18px; margin: 0; appearance: none; background: transparent; }
input[type="range"]::-webkit-slider-runnable-track { height: 3px; border-radius: 0; background: linear-gradient(to right, var(--accent) 0%, var(--accent) var(--range-fill, 83.33%), var(--line-strong) var(--range-fill, 83.33%), var(--line-strong) 100%); }
input[type="range"]::-webkit-slider-thumb { width: 12px; height: 12px; margin-top: -4.5px; appearance: none; border: 2px solid var(--paper); border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
input[type="range"]::-moz-range-track { height: 3px; background: var(--line-strong); }
input[type="range"]::-moz-range-progress { height: 3px; background: var(--accent); }
input[type="range"]::-moz-range-thumb { width: 9px; height: 9px; border: 2px solid var(--paper); border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 1px var(--accent); }

.resize-controls { display: flex; align-items: center; gap: 9px; }
select, .resize-input-wrap { height: 36px; border: 1px solid var(--line-strong); border-radius: 5px; color: var(--ink); background: #fff; font-size: 13px; }
select { min-width: 145px; padding: 0 30px 0 11px; appearance: none; background-color: #fff; background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%); background-position: calc(100% - 14px) 15px, calc(100% - 10px) 15px; background-size: 4px 4px, 4px 4px; background-repeat: no-repeat; }
.resize-input-wrap { display: inline-flex; align-items: center; gap: 4px; padding-right: 10px; }
.resize-input-wrap input { width: 65px; height: 30px; padding: 0 0 0 10px; border: 0; outline: 0; color: var(--ink); background: transparent; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }
.resize-input-wrap span { color: var(--muted); font-size: 11px; }
.is-hidden { display: none !important; }

.drop-zone { position: relative; display: flex; min-height: 188px; margin: 28px 0 22px; flex-direction: column; align-items: center; justify-content: center; border: 1px dashed var(--line-strong); border-radius: var(--radius); color: var(--ink-soft); background: var(--quiet); outline: none; transition: background-color .18s var(--ease-out), border-color .18s var(--ease-out), transform .18s var(--ease-out); }
.drop-zone::before { content: "02  画像を置く"; position: absolute; top: -21px; left: 0; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 9px; letter-spacing: .04em; }
.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.is-dragover { border-color: var(--accent); background: var(--accent-wash); }
.drop-zone.is-dragover { transform: translateY(-1px); }
.drop-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.drop-icon { width: 30px; height: 30px; margin-bottom: 9px; color: var(--accent); }
.drop-zone p { margin: 0; color: var(--ink); font-size: 15px; font-weight: 600; }
.drop-zone span { margin-top: 3px; color: var(--muted); font-size: 12px; }

.queue-toolbar, .bulk-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 0 0 14px; border-bottom: 1px solid var(--line); }
.queue-toolbar p, .bulk-bar p { margin: 0; color: var(--ink-soft); font-size: 12px; }
.toolbar-actions { display: flex; gap: 8px; }
.button { min-height: 35px; padding: 7px 13px; border: 1px solid transparent; border-radius: var(--radius-sm); font-size: 12px; font-weight: 600; line-height: 1.25; transition: transform .14s var(--ease-out), background-color .14s var(--ease-out), border-color .14s var(--ease-out), color .14s var(--ease-out); }
.button:active:not(:disabled) { transform: scale(.97); }
.button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover:not(:disabled) { background: var(--accent-dark); }
.button-primary:disabled { opacity: .52; }
.button-quiet { color: var(--ink-soft); border-color: var(--line-strong); background: #fff; }
.button-quiet:hover { color: var(--ink); border-color: var(--ink-soft); }

.empty-state { display: flex; flex-direction: column; gap: 8px; padding: 0 0 28px; color: var(--muted); font-size: 12px; text-align: center; }
.sample-comparison { display: inline-flex; align-self: center; align-items: center; gap: 6px; color: var(--line-strong); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 9px; }
.sample-comparison b { color: var(--muted); font-weight: 500; }
.sample-comparison i { color: var(--line-strong); font-family: sans-serif; font-style: normal; }
.sample-comparison em { margin-left: 4px; color: var(--accent); font-family: "Noto Sans JP", sans-serif; font-style: normal; font-weight: 600; }
.file-list { margin: 0; padding: 0; list-style: none; }
.file-row { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; gap: 13px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); animation: reveal .2s var(--ease-out) both; }
.file-row.is-processing { opacity: .75; }
.thumb { width: 44px; height: 44px; overflow: hidden; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 7px; background: repeating-conic-gradient(#edf1f1 0% 25%, #fff 0% 50%) 50% / 11px 11px; }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.file-info { min-width: 0; }
.file-name { overflow: hidden; margin: 0; color: var(--ink); font-size: 13px; font-weight: 600; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; }
.file-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 5px 8px; margin-top: 4px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 10px; line-height: 1.4; }
.comparison { display: inline-flex; align-items: center; gap: 5px; }
.comparison-arrow { color: var(--line-strong); font-family: sans-serif; }
.saving { color: var(--accent); font-family: "Noto Sans JP", sans-serif; font-weight: 700; }
.file-error { color: var(--danger); font-family: "Noto Sans JP", sans-serif; }
.file-actions { display: flex; align-items: center; gap: 7px; }
.icon-button { width: 32px; height: 32px; display: grid; place-items: center; padding: 0; border: 1px solid var(--line-strong); border-radius: 50%; color: var(--ink-soft); background: #fff; transition: color .15s var(--ease-out), border-color .15s var(--ease-out), transform .15s var(--ease-out); }
.icon-button:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.icon-button:active:not(:disabled) { transform: scale(.94); }
.icon-button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.icon-button svg { width: 15px; height: 15px; }
.row-download { width: auto; min-width: 67px; height: 32px; padding: 0 10px; border-radius: var(--radius-sm); font-size: 11px; }
.spinner { width: 15px; height: 15px; border: 1.5px solid var(--line-strong); border-top-color: var(--accent); border-radius: 50%; animation: spin .7s linear infinite; }
.bulk-bar { margin-top: 21px; padding: 15px 0 0; border-top: 1px solid var(--line); border-bottom: 0; }
.notice { min-height: 20px; margin: 18px 0 0; color: var(--ink-soft); font-size: 12px; text-align: center; }
.notice.is-error { color: var(--danger); }

.site-footer { width: min(100% - 40px, 980px); display: flex; justify-content: space-between; gap: 12px; margin: 0 auto; padding: 21px 0 29px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.site-footer a { color: inherit; text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

@keyframes reveal { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: translateY(0); } }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 620px) {
  .site-header { width: min(100% - 32px, 980px); height: 62px; }
  .header-label { font-size: 11px; }
  .page-shell { width: min(100% - 32px, 760px); padding: 49px 0 40px; }
  .intro { margin-bottom: 36px; }
  .intro > p:not(.eyebrow) { margin-top: 13px; font-size: 13px; }
  .mobile-break { display: inline; }
  .setting-row { grid-template-columns: 1fr; gap: 8px; align-items: start; min-height: auto; padding: 15px 0; }
  .settings::after { left: 24px; }
  .settings::before { top: 5px; }
  .setting-label { justify-content: flex-start; }
  .format-control { width: 100%; grid-template-columns: repeat(3, 1fr); }
  .format-control label { padding: 8px 7px; }
  .range-wrap { width: 100%; max-width: none; grid-template-columns: 20px minmax(80px, 1fr) 24px; }
  .resize-controls { width: 100%; }
  select { flex: 1; min-width: 0; }
  .drop-zone { min-height: 169px; margin: 22px 0 18px; }
  .queue-toolbar, .bulk-bar { align-items: flex-start; flex-direction: column; gap: 10px; }
  .toolbar-actions, .toolbar-actions .button, .bulk-bar .button { width: 100%; }
  .file-row { grid-template-columns: 38px minmax(0, 1fr) auto; gap: 10px; }
  .thumb { width: 38px; height: 38px; }
  .file-actions { align-self: stretch; flex-direction: column; justify-content: center; }
  .row-download { min-width: 32px; width: 32px; padding: 0; border-radius: 50%; font-size: 0; }
  .row-download::before { content: "↓"; font-size: 16px; line-height: 1; }
  .file-meta { font-size: 9px; }
  .site-footer { width: min(100% - 32px, 980px); padding-bottom: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}