:root {
  --fg: #1b1c1e;
  --muted: #6b7076;
  --bg: #f4f3ef;
  --panel: #ffffff;
  --panel-2: #faf9f6;
  --border: #e4e1d9;
  --accent: #1f9d4d;
  --accent-fg: #ffffff;
  --accent-weak: #e6f6ec;
  --danger: #c0563b;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 4px 16px rgba(0, 0, 0, .05);
  --maxw: 820px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e9e9ea; --muted: #9aa0a6; --bg: #131417; --panel: #1c1e22;
    --panel-2: #22252a; --border: #31343b; --accent: #3ddc73;
    --accent-fg: #08210f; --accent-weak: #183a24; --danger: #e0785c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px rgba(0, 0, 0, .35);
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; padding: 0 20px 64px;
  background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
header, main, footer { max-width: var(--maxw); margin-inline: auto; }

/* ---- header (brand 左 / status + tabs 右) ---- */
header {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 10px 20px;
  padding: 20px 0 16px; border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 1.55rem; letter-spacing: -.02em; }
.headtools {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-left: auto;
}
.sub {
  max-width: var(--maxw); margin: 12px auto 4px;
  color: var(--muted); font-size: .88rem;
}

.status {
  display: inline-flex; align-items: center; gap: .45em;
  padding: .28em .85em; border-radius: 999px;
  font-size: .82rem; font-weight: 600;
}
.status::before {
  content: ""; width: .5em; height: .5em; border-radius: 50%;
  background: currentColor;
}
.status.booting { background: #fff6da; color: #8a6d00; }
.status.ready { background: var(--accent-weak); color: var(--accent); }
.status.error { background: #fde2e2; color: #b23b3b; }
@media (prefers-color-scheme: dark) {
  .status.booting { background: #3a3413; color: #e9cf6a; }
  .status.error { background: #3a1f1f; color: #f0a08c; }
}

/* ---- tabs (segmented control) ---- */
nav.tabs {
  display: flex; gap: 4px; padding: 5px; width: max-content; max-width: 100%;
  margin: 0; overflow-x: auto;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 999px;
}
nav.tabs button {
  border: none; background: transparent; color: var(--muted);
  padding: .5em 1.15em; border-radius: 999px; white-space: nowrap;
  font: inherit; font-size: .92rem; font-weight: 600; cursor: pointer;
  transition: background .15s, color .15s;
}
nav.tabs button:hover { color: var(--fg); }
nav.tabs button.active {
  background: var(--accent); color: var(--accent-fg); box-shadow: var(--shadow);
}

/* ---- panels ---- */
.tab { display: none; }
.tab.active { display: grid; gap: 16px; }
.controls, .result {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}

/* ---- form ---- */
.controls { display: grid; gap: 14px; }
label {
  display: grid; gap: 6px;
  font-size: .8rem; font-weight: 600; color: var(--muted);
}
textarea, select, input[type=file] {
  width: 100%; padding: .55em .7em; font: inherit; color: var(--fg);
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
textarea { resize: vertical; }
select:focus, textarea:focus, input:focus {
  outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent;
}
input[type=range] { width: 100%; accent-color: var(--accent); padding: 0; }
select:disabled { opacity: .5; cursor: not-allowed; }
input[type=color] {
  width: 100%; height: 2.5em; padding: 2px; cursor: pointer;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.row-colors { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; }
label.inline { display: flex; flex-direction: row; align-items: center; gap: .5em; }
label.inline input[type=color] { width: 48px; height: 2em; padding: 2px; }
.dropzone {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
  padding: 18px 20px; border: 2px dashed var(--border); border-radius: var(--radius-sm);
}
.filebtn {
  display: inline-block; padding: .5em 1.2em; border-radius: var(--radius-sm);
  background: var(--accent); color: var(--accent-fg); font-weight: 600; cursor: pointer;
}
.filebtn:hover { filter: brightness(1.06); }
.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 14px; }
.hint { color: var(--muted); font-size: .82rem; margin: 0; font-weight: 500; }
label.check {
  display: flex; align-items: center; gap: .5em;
  font-size: .9rem; font-weight: 500; color: var(--fg); cursor: pointer;
}
label.check input[type=checkbox] {
  width: 1.15em; height: 1.15em; margin: 0; flex: none;
  accent-color: var(--accent); cursor: pointer;
}
.warn {
  margin: 0; padding: .55em .8em; border-radius: var(--radius-sm);
  background: #fde2e2; color: #b23b3b; font-size: .85rem; font-weight: 600;
}
@media (prefers-color-scheme: dark) { .warn { background: #3a1f1f; color: #f0a08c; } }

/* ---- buttons ---- */
main button, .btnrow button {
  appearance: none; border: none; border-radius: var(--radius-sm);
  padding: .62em 1.5em; font: inherit; font-weight: 600; cursor: pointer;
  background: var(--accent); color: var(--accent-fg);
  transition: filter .15s, opacity .15s;
}
main button:hover:not(:disabled) { filter: brightness(1.06); }
main button:disabled { opacity: .45; cursor: not-allowed; }
.controls > button { justify-self: start; }
#cam-stop { background: var(--danger); }

.btnrow { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ---- results ---- */
.result { display: grid; gap: 12px; justify-items: center; }
.result img, .result canvas {
  max-width: 100%; height: auto; background: #fff;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.info {
  width: 100%; text-align: left; color: var(--muted);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: .85rem; white-space: pre-wrap; word-break: break-word;
}
.btnrow .info { width: auto; }
.dl-links { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
#enc-dl, #enc-dl-svg {
  color: var(--accent); font-weight: 600; font-size: .9rem; text-decoration: none;
}
#enc-dl:hover, #enc-dl-svg:hover { text-decoration: underline; }
.dropzone.drag { border-color: var(--accent); background: var(--accent-weak); }

footer { margin-top: 40px; text-align: center; color: var(--muted); font-size: .82rem; }