/* 主題：亮版為預設，[data-theme="dark"] 為暗版。文字大小由 --scale 控制（html 根字級）。 */
:root {
  --scale: 1.15;
  --bg: #f8f7f4; --panel: #ffffff; --panel2: #fafafa; --line: #e4e4e7;
  --ink: #18181b; --mute: #71717a; --btn-hover: #f4f4f5; --chip: #f4f4f5; --chip-ink: #52525b;
  --canvas: #fbfaf7; --grid: #d6d3cd; --shape: #ffffff; --shape-sel: #fef08a;
  --ok-bg: #dcfce7; --ok-ink: #166534;
  --warn-bg: #fef9c3; --warn-ink: #854d0e; --warn-line: #fde68a; --warn-soft: #fffbeb;
  --bad-bg: #fee2e2; --bad-ink: #991b1b; --bad-line: #fecaca; --bad-soft: #fef2f2;
  --info-bg: #eff6ff; --info-line: #93c5fd;
  --toast-bg: #ecfdf5; --toast-line: #a7f3d0; --toast-ink: #065f46;
  --disc-bg: #fef9c3; --disc-line: #fde047; --disc-ink: #713f12;
  --btn-dark-bg: #18181b; --btn-dark-ink: #ffffff;
}
[data-theme="dark"] {
  --bg: #121214; --panel: #1c1c1f; --panel2: #232327; --line: #3f3f46;
  --ink: #f4f4f5; --mute: #a1a1aa; --btn-hover: #2e2e33; --chip: #2a2a2e; --chip-ink: #d4d4d8;
  --canvas: #17171a; --grid: #3a3a40; --shape: #2a2a2f; --shape-sel: #7c6a0a;
  --ok-bg: #14532d; --ok-ink: #bbf7d0;
  --warn-bg: #713f12; --warn-ink: #fde68a; --warn-line: #a16207; --warn-soft: #2b2410;
  --bad-bg: #7f1d1d; --bad-ink: #fecaca; --bad-line: #b91c1c; --bad-soft: #2d1515;
  --info-bg: #172554; --info-line: #3b82f6;
  --toast-bg: #052e21; --toast-line: #047857; --toast-ink: #a7f3d0;
  --disc-bg: #3b2f0b; --disc-line: #a16207; --disc-ink: #fde68a;
  --btn-dark-bg: #f4f4f5; --btn-dark-ink: #18181b;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { font-size: calc(16px * var(--scale)); }
body { margin: 0; background: var(--bg); color: var(--ink); font: 1rem/1.5 system-ui, "Noto Sans TC", "Microsoft JhengHei", sans-serif; }
button, input, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.topbar { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; padding: .5rem .75rem; background: var(--panel); border-bottom: 1px solid var(--line); }
.logo { width: 2.1rem; height: 2.1rem; border-radius: .4rem; background: var(--btn-dark-bg); color: var(--btn-dark-ink); display: grid; place-items: center; font-weight: 700; font-size: .8rem; flex: none; }
.title { font-weight: 700; font-size: 1.05rem; line-height: 1.25; }
.ver { font-size: .75rem; background: var(--ok-bg); color: var(--ok-ink); border-radius: 99px; padding: .05rem .5rem; margin-left: .25rem; }
.subtitle { font-size: .8rem; color: var(--mute); }
.stats { margin-left: auto; font-size: .8rem; color: var(--mute); text-align: right; }
.tools { display: flex; gap: .35rem; }
.disclaimer { background: var(--disc-bg); border-bottom: 1px solid var(--disc-line); color: var(--disc-ink); font-size: .85rem; padding: .3rem .75rem; }

.tabs { display: flex; gap: .4rem; padding: .4rem .75rem; background: var(--panel); border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab { border: 0; border-radius: 99px; padding: .25rem 1rem; background: var(--chip); color: var(--chip-ink); cursor: pointer; white-space: nowrap; }
.tab.active { background: var(--btn-dark-bg); color: var(--btn-dark-ink); }

.view.pad { padding: 1rem; }
.view h2 { margin-top: 0; }
.layout { display: flex; }
.sidebar { width: 13rem; flex: none; background: var(--panel); border-right: 1px solid var(--line); padding: .75rem; display: flex; flex-direction: column; gap: .5rem; }
.sidebar h4 { margin: .5rem 0 0; font-size: .85rem; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .4rem; }
.canvas-col { flex: 1; min-width: 0; }
.canvas-wrap { position: relative; background: var(--canvas); border-bottom: 1px solid var(--line); height: 64vh; }
#canvas { width: 100%; height: 100%; touch-action: none; user-select: none; display: block; }
.pending { position: absolute; top: .5rem; right: .5rem; background: #facc15; color: #18181b; border-radius: 99px; padding: .1rem .75rem; font-size: .85rem; font-weight: 700; }

.btn { border: 1px solid var(--line); background: var(--panel); border-radius: 99px; padding: .35rem .9rem; cursor: pointer; font-size: .85rem; }
.btn:hover:not(:disabled) { background: var(--btn-hover); }
.btn:disabled { opacity: .4; cursor: default; }
.btn.dark { background: var(--btn-dark-bg); color: var(--btn-dark-ink); border-color: var(--btn-dark-bg); }
.btn.dark:hover:not(:disabled) { opacity: .85; background: var(--btn-dark-bg); }
.btn.small { padding: .15rem .65rem; }
.hint { color: var(--mute); font-size: .8rem; margin: 0; }

.auto-panel { background: var(--panel); border-bottom: 1px solid var(--line); padding: .6rem .75rem; display: flex; flex-direction: column; gap: .5rem; }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.toast { padding: .4rem .75rem; border-radius: .6rem; font-size: .85rem; background: var(--toast-bg); border: 1px solid var(--toast-line); color: var(--toast-ink); }
.toast.err { background: var(--bad-soft); border-color: var(--bad-line); color: var(--bad-ink); }
.proposal { display: flex; justify-content: space-between; gap: .5rem; flex-wrap: wrap; align-items: center; padding: .5rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--panel2); font-size: .85rem; }
.proposal.sel { background: var(--info-bg); border-color: var(--info-line); }
.proposal .sub { color: var(--mute); }

.detail { display: grid; grid-template-columns: 1.2fr .8fr; gap: .75rem; padding: .75rem; background: var(--panel); }
.card { border: 1px solid var(--line); border-radius: 1rem; padding: .75rem; background: var(--panel2); }
.card h3 { margin: 0 0 .5rem; font-size: .95rem; }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; font-size: .85rem; }
.form label { display: flex; flex-direction: column; gap: .15rem; }
.form input, .form select { height: 2.1rem; border: 1px solid var(--line); border-radius: .5rem; padding: 0 .5rem; background: var(--panel); }
.form input:disabled { opacity: .7; }
.form .full { grid-column: 1 / -1; }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: .8rem; }
.note { background: var(--panel); border: 1px solid var(--line); border-radius: .6rem; padding: .5rem; font-size: .8rem; color: var(--chip-ink); }
.note.warn { background: var(--warn-soft); border-color: var(--warn-line); color: var(--warn-ink); }
.clist { display: flex; flex-direction: column; gap: .4rem; max-height: 18rem; overflow: auto; }
.citem { display: flex; justify-content: space-between; gap: .4rem; align-items: center; border: 1px solid var(--line); border-radius: .6rem; padding: .4rem .5rem; font-size: .8rem; background: var(--panel); }
.citem.Warning { background: var(--warn-soft); border-color: var(--warn-line); }
.citem.Invalid { background: var(--bad-soft); border-color: var(--bad-line); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); gap: .6rem; margin-bottom: 1rem; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: .9rem; padding: .6rem .75rem; }
.stat.hl { background: var(--warn-soft); border-color: var(--warn-line); }
.stat .k { font-size: .8rem; color: var(--mute); }
.stat .v { font-size: 1.4rem; font-weight: 700; }
.stat .s { font-size: .75rem; color: var(--mute); }
table { border-collapse: collapse; width: 100%; background: var(--panel); font-size: .85rem; }
th, td { border: 1px solid var(--line); padding: .25rem .5rem; text-align: left; }
th { background: var(--chip); }
.badge { padding: .05rem .5rem; border-radius: 99px; font-size: .75rem; }
.badge.Valid { background: var(--ok-bg); color: var(--ok-ink); }
.badge.Warning { background: var(--warn-bg); color: var(--warn-ink); }
.badge.Invalid { background: var(--bad-bg); color: var(--bad-ink); }
.route { background: var(--panel); border: 1px solid var(--line); border-radius: .75rem; padding: .6rem; margin-bottom: .5rem; font-size: .85rem; }
.filter { display: flex; gap: .4rem; margin-bottom: .6rem; flex-wrap: wrap; }
.filter .btn.on { background: var(--btn-dark-bg); color: var(--btn-dark-ink); }

/* SVG 畫布 */
.grid-dot { fill: var(--grid); }
.shape { fill: var(--shape); stroke: var(--ink); }
.shape.sel { fill: var(--shape-sel); }
.shape.overlap { stroke: #ef4444; stroke-width: 4; }
.svg-text { fill: var(--ink); }
.junction { fill: var(--ink); stroke: var(--panel); }
.blk { cursor: grab; }
.conn { cursor: pointer; }

@media (max-width: 800px) {
  .layout { flex-direction: column; }
  .sidebar { width: auto; flex-direction: row; flex-wrap: wrap; border-right: 0; border-bottom: 1px solid var(--line); }
  .sidebar .hint, .sidebar h4 { display: none; }
  .grid2 { display: contents; }
  .canvas-wrap { height: 60vh; }
  .detail { grid-template-columns: 1fr; }
  .stats { display: none; }
}