:root {
  --desk: #141414;        /* 初始炭黑配色，與 appearance.js 同步 */
  --panel: #202020;
  --line: #383838;
  --ink-ui: #ece6d8;
  --dim: #aaa79e;
  --control-line: #79776f;
  --lamp: #8fc48f;        /* 面板上的狀態燈 */
  --warning: #d9a25a;
  --lamp-off: #4a4740;
  --paper: #0e0e0e;       /* 預設黑底 */
  --perf: #b5ae9b;        /* 撕線 */
  --strip: 28px;          /* 兩側齒孔帶寬 */
  --mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, "Courier New", monospace;
  --cjk: "PingFang TC", "Noto Sans CJK TC", "Noto Sans TC", "Microsoft JhengHei", "Hiragino Sans", "Yu Gothic", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --sans: -apple-system, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--desk); color: var(--ink-ui); font-family: var(--sans); min-height: 100%; }
body { display: flex; flex-direction: column; }

/* ── 銘牌：標題右側就是工具列，垂直空間全留給紙 ── */
header { display: flex; align-items: center; gap: 10px 14px; flex-wrap: wrap; padding: 10px 20px; border-bottom: 1px solid var(--line); background: var(--panel); }
header .plate { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; flex: 0 0 auto; }
header h1 { margin: 0; font-family: var(--mono); font-size: 18px; font-weight: 600; letter-spacing: .04em; color: var(--ink-ui); }
header h1::before { content: "▚ "; color: var(--dim); }
.lamp { display: flex; flex: 0 0 auto; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px; letter-spacing: .12em; color: var(--dim); white-space: nowrap; }
header .stat { flex: 0 0 auto; font-family: var(--mono); font-size: 12px; color: var(--dim); white-space: nowrap; }
.lamp i { width: 10px; height: 10px; border-radius: 50%; background: var(--lamp-off); box-shadow: inset 0 1px 2px rgba(0,0,0,.6); }
.lamp.on i { background: var(--lamp); box-shadow: 0 0 6px var(--lamp), inset 0 -1px 2px rgba(0,0,0,.35); }
.lamp.on { color: var(--ink-ui); }

main { flex: 1; display: grid; grid-template-columns: 352px 1fr; grid-template-rows: minmax(0, 1fr); gap: 0; min-height: 0; }
aside { background: var(--panel); border-right: 1px solid var(--line); padding: 20px; display: flex; flex-direction: column; gap: 16px; overflow-y: auto; }
aside > * { flex-shrink: 0; }
section.out { display: flex; flex-direction: column; min-width: 0; min-height: 0; }

/* ── 控制面板：分組 ── */
.controls { display: flex; flex-direction: column; gap: 24px; }
.group { display: flex; flex-direction: column; gap: 12px; padding-top: 20px; border-top: 1px solid var(--line); }
.gl { font-family: var(--mono); font-size: 10.5px; letter-spacing: .18em; color: var(--dim); text-transform: uppercase; }
.gl b { color: var(--ink-ui); font-weight: 600; letter-spacing: .04em; margin-right: 8px; font-size: 16px; }

.image-inputs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.image-inputs .drop { grid-column: 1 / -1; }
.image-inputs:has(#cameraOpen[hidden]) #randomImage { grid-column: 1 / -1; }
.drop { position: relative; display: flex; flex-direction: column; justify-content: center; gap: 6px; min-height: 56px; border: 1px dashed var(--control-line); border-radius: 8px; padding: 16px 12px; text-align: center; cursor: pointer; color: var(--dim); font-size: 14px; line-height: 1.5; transition: background .15s, border-color .15s; }
.drop:hover, .drop.over { background: color-mix(in srgb, var(--panel) 90%, var(--ink-ui)); border-color: var(--ink-ui); color: var(--ink-ui); }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.drop strong { color: var(--ink-ui); font-size: 17px; font-weight: 600; }
.source-preview { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; min-width: 0; min-height: 64px; }
.thumb { flex: 0 0 64px; width: 64px; height: 64px; object-fit: contain; background: var(--desk); border-radius: 6px; display: none; }
.thumb.show { display: block; }
.random-image, .camera-open { min-height: 56px; }
.random-image[aria-busy="true"] { border-style: dashed; }
.random-image:disabled { opacity: .5; cursor: default; }
.image-status { margin: 0; overflow-wrap: anywhere; }
.image-status:empty { display: none; }

/* ── 鏡頭：直播／凍結／關閉狀態一眼看得出來 ── */
.camera-controls { display: flex; gap: 10px; }
.camera-controls[hidden] { display: none; }
.camera-controls button { flex: 1 1 0; padding-inline: 8px; }
.camera-status { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.camera-status:empty { display: none; }
.camera-status[data-state="live"], .camera-status[data-state="paused"] { color: var(--ink-ui); }
.camera-status[data-state="live"]::before, .camera-status[data-state="paused"]::before {
  content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 8px; border-radius: 50%; background: var(--lamp); box-shadow: 0 0 6px var(--lamp); }
.camera-status[data-state="paused"]::before { background: var(--dim); box-shadow: none; }
.camera-preview { background: #000; }
.camera-preview.mirrored { transform: scaleX(-1); }
button:focus-visible, select:focus-visible, input:focus-visible, .drop:focus-within { outline: 3px solid var(--lamp); outline-offset: 3px; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; flex-wrap: wrap; font-size: 16px; color: var(--ink-ui); line-height: 1.5; }
.field label output { font-family: var(--mono); color: var(--ink-ui); }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 52px; background: transparent; margin: 0; touch-action: pan-y; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 6px; background: var(--control-line); border-radius: 3px; }
input[type=range]::-moz-range-track { height: 6px; background: var(--control-line); border-radius: 3px; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 30px; height: 30px; margin-top: -12px; border-radius: 50%; background: var(--ink-ui); border: 3px solid var(--panel); box-shadow: 0 0 0 1px var(--dim); }
input[type=range]::-moz-range-thumb { width: 24px; height: 24px; border-radius: 50%; background: var(--ink-ui); border: 3px solid var(--panel); box-shadow: 0 0 0 1px var(--dim); }
input[type=range]:active::-webkit-slider-thumb { transform: scale(1.15); }
input[type=range]:disabled { opacity: .35; }
button, label, select, input { touch-action: manipulation; }
select, input[type=text] { width: 100%; min-height: 52px; background: var(--desk); color: var(--ink-ui); border: 1px solid var(--control-line); border-radius: 8px; padding: 12px; font-family: var(--sans); font-size: 16px; }
.toggle { display: flex; align-items: center; gap: 12px; min-height: 52px; padding: 12px; border: 1px solid var(--control-line); border-radius: 8px; font-size: 16px; line-height: 1.5; color: var(--ink-ui); cursor: pointer; user-select: none; }
.toggle:hover { background: color-mix(in srgb, var(--panel) 90%, var(--ink-ui)); }
.toggle:has(input:focus-visible) { outline: 3px solid var(--lamp); outline-offset: 3px; }
.toggle input { flex: 0 0 24px; accent-color: var(--lamp); width: 24px; height: 24px; margin: 0; }
.hint { font-size: 14px; color: var(--dim); line-height: 1.6; }
.hint.warn { color: var(--warning); }
/* 模式與紙張選擇 */
.seg { display: flex; gap: 8px; }
.seg label { position: relative; flex: 1; display: flex; align-items: center; justify-content: center; min-height: 52px; border: 1px solid var(--control-line); border-radius: 8px; text-align: center; padding: 12px 8px; font-size: 16px; cursor: pointer; color: var(--ink-ui); background: var(--desk); }
.seg label:has(input:checked) { background: var(--ink-ui); color: var(--desk); font-weight: 500; }
.seg label:has(input:focus-visible) { outline: 3px solid var(--lamp); outline-offset: 3px; }
.seg input { position: absolute; opacity: 0; width: 0; height: 0; }
.seg input:focus-visible, .toggle input:focus-visible { outline: none; }
.paper-choices { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.paper-choice { position: relative; display: flex; flex-direction: column; gap: 8px; padding: 8px; min-width: 0; border: 1px solid var(--control-line); border-radius: 8px; background: var(--desk); cursor: pointer; font-size: 16px; line-height: 1.5; text-align: center; }
.paper-choice canvas { display: block; width: 100%; height: 44px; border-radius: 3px; }
.paper-choice input { position: absolute; opacity: 0; width: 0; height: 0; }
.paper-choice:hover { border-color: var(--ink-ui); }
.paper-choice:has(input:checked) { border-color: var(--ink-ui); box-shadow: inset 0 0 0 1px var(--ink-ui); font-weight: 600; }
.paper-choice:has(input:checked)::after { content: "✓"; position: absolute; right: 5px; top: 5px; width: 24px; height: 24px; border-radius: 50%; background: var(--ink-ui); color: var(--desk); font-weight: 700; }
.paper-choice:has(input:focus-visible) { outline: 3px solid var(--lamp); outline-offset: 3px; }
.paper-choice input:focus-visible { outline: none; }

.workspace-choices { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.workspace-choice { position: relative; display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 10px 6px; border: 1px solid var(--control-line); border-radius: 8px; background: var(--desk); font-size: 16px; cursor: pointer; }
.workspace-choice input { position: absolute; opacity: 0; width: 0; height: 0; }
.workspace-choice:has(input:checked) { background: var(--ink-ui); color: var(--desk); border-color: var(--ink-ui); font-weight: 600; }
.workspace-choice:has(input:focus-visible) { outline: 3px solid var(--lamp); outline-offset: 3px; }
.workspace-choice input:focus-visible { outline: none; }
.workspace-swatch { width: 18px; height: 18px; flex: 0 0 18px; border: 1px solid currentColor; border-radius: 50%; }

/* ── 工具列：全部動作攤平在標題列，不收進下拉選單 ── */
.toolbar { display: flex; flex: 1 1 auto; min-width: 0; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px; }
.toolbar button { white-space: nowrap; }
.sidebarToggle { display: inline-flex; flex: 0 0 auto; align-items: center; justify-content: center; padding: 12px; }
.sidebarToggle svg { display: block; }
.sidebarToggle .chev { transition: transform .15s; transform-origin: 14.6px 12px; }
.sidebarToggle[aria-expanded="false"] .chev { transform: rotate(180deg); }
.export-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.export-actions button { padding-inline: 12px; }
.zoom-controls { display: flex; flex-shrink: 0; align-items: center; gap: 8px; margin-left: auto; }
.zoom-controls button { display: flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 6px; }
.zoom-controls .symbol { font-size: 22px; line-height: 1; }
.zoom-controls output { min-width: 52px; text-align: center; font-family: var(--mono); font-size: 15px; color: var(--ink-ui); }
.zoom-controls #zoomFit { padding-inline: 14px; }
.zoom-controls button:disabled { opacity: .35; cursor: default; }
.zoom-controls button[aria-pressed="true"] { border-color: var(--dim); }
button { min-height: 52px; min-width: 52px; background: color-mix(in srgb, var(--panel) 88%, var(--ink-ui)); color: var(--ink-ui); border: 1px solid var(--control-line); border-radius: 8px; padding: 12px 16px; font-family: var(--sans); font-size: 16px; font-weight: 600; line-height: 1.5; cursor: pointer; transition: border-color .12s, color .12s, background .12s; }
button:hover { border-color: var(--ink-ui); background: color-mix(in srgb, var(--panel) 78%, var(--ink-ui)); }
button:active:not(:disabled) { background: color-mix(in srgb, var(--panel) 68%, var(--ink-ui)); }
button.primary { border-color: var(--ink-ui); background: var(--ink-ui); color: var(--desk); }
button.primary:hover { background: color-mix(in srgb, var(--ink-ui) 92%, var(--desk)); }
button.primary:active:not(:disabled) { background: color-mix(in srgb, var(--ink-ui) 82%, var(--desk)); }
button:disabled { opacity: .35; cursor: default; }

/* ── 紙 ── */
.stage { flex: 1; overflow: auto; padding: 24px; background: var(--desk); }
.paper { position: relative; margin: 0 auto; background: var(--paper); width: max-content; box-shadow: 0 14px 34px -14px rgba(0,0,0,.65), inset 0 1px 0 rgba(255,255,255,.35); }
.stage[data-paper="paper"] .paper { padding: 0 var(--strip); }
.stage[data-paper="paper"] .paper::before, .stage[data-paper="paper"] .paper::after { content: ""; position: absolute; top: 0; bottom: 0; width: var(--strip); pointer-events: none;
  background: radial-gradient(circle at 50% 50%, var(--desk) 0 4.2px, rgba(0,0,0,.18) 4.6px, transparent 5.6px) 0 6px / var(--strip) 26px repeat-y; }
.paper::before { left: 0; border-right: 1px dashed var(--perf); }
.paper::after { right: 0; border-left: 1px dashed var(--perf); }
canvas#view { display: block; }
.empty { position: absolute; inset: 0; display: none; align-items: center; justify-content: center; text-align: center; color: var(--perf); font-family: var(--mono); font-size: 13px; line-height: 1.8; padding: 24px; }
.paper.blank { min-width: min(560px, 100%); min-height: 260px; }
.paper.blank .empty { display: flex; }
.panelToggle { display: none; }

@media (max-width: 1100px) and (min-width: 821px) {
  main { grid-template-columns: 304px 1fr; }
  aside { padding: 16px; }
  .stage { padding: 16px; }
}

/* ── 手機：丟圖 → 紙 → 可收合面板；面板開時紙釘頂 ── */
@media (max-width: 820px) {
  :root { --strip: 20px; }
  html, body { height: auto; }
  body { display: block; padding-bottom: max(12px, env(safe-area-inset-bottom)); }
  header { padding: 10px 16px; gap: 8px 10px; }
  header h1 { font-size: 18px; }
  header .plate { flex: 1 1 auto; }
  header .stat { order: 2; }
  .lamp { order: 2; }
  .toolbar { order: 3; flex: 1 1 100%; justify-content: flex-start; }
  .export-actions { flex: 1 1 100%; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .export-actions button { padding-inline: 8px; }
  .zoom-controls { flex: 1 1 100%; margin-left: 0; }
  .zoom-controls button { flex: 1; gap: 4px; }
  main { display: flex; flex-direction: column; }
  aside { display: contents; }
  /* 送紙區三欄並排（選圖／隨機／鏡頭）；鏡頭開著時按鈕少一顆就回到兩欄 */
  .image-inputs { order: 1; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 12px 16px 0; }
  .image-inputs .drop { grid-column: auto; }
  .image-inputs:has(#cameraOpen[hidden]) { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .image-inputs:has(#cameraOpen[hidden]) #randomImage { grid-column: auto; }
  .image-inputs button { padding-inline: 6px; }
  .drop { padding: 10px 6px; }
  .drop strong { font-size: 16px; }
  .drop-help { display: none; }
  .camera-controls { order: 1; margin: 10px 16px 0; }
  .source-preview { order: 1; min-height: 48px; margin: 10px 16px; }
  .thumb { flex-basis: 48px; width: 48px; height: 48px; }
  section.out { order: 2; }
  .panelToggle { order: 3; display: flex; justify-content: space-between; align-items: center; margin: 0 16px; padding: 12px 16px; width: auto; }
  .panelToggle::after { content: "▾"; transition: transform .15s; }
  .panelToggle[aria-expanded="true"]::after { transform: rotate(180deg); }
  .controls { order: 4; padding: 8px 16px 20px; background: var(--panel); margin: 12px 16px 0; border: 1px solid var(--line); border-radius: 8px; }
  .controls.collapsed { display: none; }
  .group:first-child { border-top: 0; }
  .sidebarToggle { display: none; }
  section.out { position: relative; }
  .stage { flex: none; height: var(--stage-height, 40svh); padding: 12px 16px 16px; }
  body.panel-open section.out { position: sticky; top: 0; z-index: 5; background: var(--desk); box-shadow: 0 6px 12px -6px rgba(0,0,0,.7); }
  body.panel-open .stage { max-height: 38vh; overflow: auto; }
}
/* 平板與大手機：四個匯出動作一列排得下，不必兩兩換行 */
@media (min-width: 561px) and (max-width: 820px) {
  .export-actions { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (min-width: 821px) {
  html, body { height: 100%; }
  body { height: 100dvh; }
  main { min-height: 0; }
  body.sidebar-collapsed main { grid-template-columns: minmax(0, 1fr); }
  body.sidebar-collapsed aside { display: none; }
  .stage { min-height: 0; }
}