:root {
  --ink: #1f2430;
  --ink-soft: #5b6472;
  --paper: #f6f6f1;
  --panel: #ffffff;
  --line: #e2e0d5;
  --accent: #0f766e;
  --accent-soft: #e4f2f0;
  --pro: #7c3aed;
  --pro-soft: #f3eefe;
  --ok: #15803d;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(31 36 48 / 0.06), 0 8px 24px rgb(31 36 48 / 0.07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

.wrap-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}
.wrap-inner.wide { max-width: 1240px; }

/* Header */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: 1240px;
}
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.08rem; }
.logo-mark { color: var(--accent); display: flex; align-items: center; }
.header-nav { display: flex; align-items: center; gap: 12px; }
.header-nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; }
.header-nav a:hover { color: var(--ink); }
@media (max-width: 520px) {
  .header-nav a, #license-btn { display: none; }
  .logo { font-size: 0.98rem; }
}

/* Buttons */
.btn {
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
  transition: transform 0.06s ease, box-shadow 0.12s ease;
}
.btn:hover { box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-pro { background: var(--pro); border-color: var(--pro); color: #fff; }
.btn-ghost { border-color: transparent; background: transparent; color: var(--ink-soft); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }
.linklike {
  font: inherit; background: none; border: none; color: var(--accent);
  text-decoration: underline; cursor: pointer; padding: 0;
}

/* Hero */
.hero { padding: 40px 0 8px; max-width: 780px; }
.hero h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
.hero p { color: var(--ink-soft); font-size: 1.02rem; margin: 0; }

/* Studio shell */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.studio-shell { margin: 26px 0 12px; overflow: hidden; }

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: #fbfbf8;
}
.tool-cluster { display: flex; align-items: center; gap: 5px; }
.tool-cluster + .tool-cluster { padding-left: 14px; border-left: 1px solid var(--line); }
.push-right { margin-left: auto; }
.tbtn {
  font: inherit; font-size: 0.84rem; font-weight: 600;
  padding: 6px 10px; border-radius: 7px;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  cursor: pointer; line-height: 1.2;
}
.tbtn:hover:not([disabled]) { border-color: var(--accent); color: var(--accent); }
.tbtn[disabled] { opacity: 0.4; cursor: default; }
.tbtn-accent { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.tnum {
  width: 54px; font: inherit; font-size: 0.84rem; padding: 5px 6px;
  border: 1px solid var(--line); border-radius: 7px; text-align: center;
}
.tlabel { font-size: 0.8rem; font-weight: 700; color: var(--ink-soft); white-space: nowrap; }
.counter {
  font-size: 0.8rem; font-weight: 700; color: var(--ink-soft);
  background: var(--paper); border: 1px solid var(--line);
  border-radius: 999px; padding: 4px 11px; margin-left: 6px; white-space: nowrap;
}
.counter.over-limit { color: #b45309; border-color: #f5c88a; background: #fdf3e3; }

/* Editor grid */
.studio-grid {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr) 252px;
  min-height: 560px;
}
@media (max-width: 900px) {
  .studio-grid { grid-template-columns: 1fr; }
}

/* Palette */
.palette {
  border-right: 1px solid var(--line);
  padding: 10px 8px;
  background: #fbfbf8;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}
.palette-symbols { display: flex; flex-direction: column; gap: 6px; }
.palette-btn {
  display: flex; flex-direction: column; align-items: center; gap: 1px;
  font: inherit; font-size: 0.72rem; font-weight: 600; color: var(--ink-soft);
  background: var(--panel); border: 1px solid var(--line); border-radius: 9px;
  padding: 6px 4px 5px; cursor: pointer;
}
.palette-btn svg { display: block; color: var(--ink); }
.palette-btn:hover { border-color: var(--accent); }
.palette-btn.active {
  border-color: var(--accent); background: var(--accent-soft); color: var(--accent);
}
.palette-btn.active svg { color: var(--accent); }
.tool-select-btn { margin-bottom: 2px; }
@media (max-width: 900px) {
  .palette { flex-direction: row; flex-wrap: wrap; border-right: none; border-bottom: 1px solid var(--line); }
  .palette-symbols { flex-direction: row; flex-wrap: wrap; }
  .palette-btn { width: 62px; }
}

/* Canvas */
.canvas-wrap {
  display: flex; flex-direction: column;
  min-width: 0;
  background:
    radial-gradient(circle, #e9e7dd 1px, transparent 1px) 0 0 / 22px 22px,
    #fefefc;
}
#chart-canvas {
  flex: 1;
  width: 100%;
  height: 560px;
  display: block;
  cursor: default;
  touch-action: none;
  outline: none;
}
#chart-canvas.placing { cursor: crosshair; }
#chart-canvas.pan-ready { cursor: grab; }
#chart-canvas.panning { cursor: grabbing; }
.canvas-hint {
  margin: 0; padding: 7px 14px;
  font-size: 0.78rem; color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background: #fbfbf8;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* SVG chart pieces */
#chart-canvas .guide-ring { fill: none; stroke: #cfc9bb; stroke-width: 1; stroke-dasharray: 4 5; }
#chart-canvas .guide-center { fill: #cfc9bb; }
#chart-canvas .guide-num { fill: #b3ac9d; font-size: 10px; font-weight: 600; font-family: inherit; user-select: none; }
#chart-canvas .guide-arrow { fill: none; stroke: #b3ac9d; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
#chart-canvas .stitch path { stroke: var(--ink); }
#chart-canvas .stitch path[fill="#1f2430"] { fill: var(--ink); }
#chart-canvas .stitch .hitbox { fill: rgba(0, 0, 0, 0); stroke: none; }
#chart-canvas .stitch:hover .hitbox { fill: rgb(15 118 110 / 0.07); }
#chart-canvas .stitch.selected path { stroke: var(--accent); }
#chart-canvas .stitch.selected path[fill="#1f2430"] { fill: var(--accent); }
#chart-canvas .stitch.selected .hitbox {
  fill: rgb(15 118 110 / 0.1);
  stroke: var(--accent); stroke-width: 1; stroke-dasharray: 3 3;
  vector-effect: non-scaling-stroke;
}
#chart-canvas .band {
  fill: rgb(15 118 110 / 0.08);
  stroke: var(--accent); stroke-width: 1; stroke-dasharray: 4 3;
  vector-effect: non-scaling-stroke;
}
#chart-canvas .sel-box {
  fill: none; stroke: var(--accent); stroke-width: 1.2;
  stroke-dasharray: 6 4; opacity: 0.7;
  vector-effect: non-scaling-stroke;
}
#chart-canvas .ghost { color: var(--accent); opacity: 0.45; pointer-events: none; }

/* Settings panel */
.settings {
  border-left: 1px solid var(--line);
  padding: 14px 16px 18px;
  background: #fbfbf8;
  overflow-y: auto;
}
@media (max-width: 900px) {
  .settings { border-left: none; border-top: 1px solid var(--line); }
}
label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--ink-soft); margin: 10px 0 4px; }
select, input[type="number"], input[type="text"] {
  width: 100%; font: inherit; font-size: 0.92rem; padding: 8px 10px;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
select:focus, input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.tnum:focus { outline-offset: 0; }

.mode-tabs { display: flex; gap: 6px; margin: 14px 0 4px; }
.tab {
  flex: 1; font: inherit; font-size: 0.85rem; font-weight: 600;
  padding: 8px 6px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink-soft); cursor: pointer;
}
.tab.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

.field-row { display: flex; gap: 10px; }
.field { flex: 1; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 500; margin: 10px 0 0; font-size: 0.85rem; }
.check input { accent-color: var(--accent); width: auto; }

.fill-box, .export-box {
  margin-top: 16px; padding: 12px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
}
.fill-title { display: block; font-size: 0.82rem; font-weight: 700; margin-bottom: 2px; }
.fill-box .btn, .export-box .export-buttons { margin-top: 12px; }
.mini-note { font-size: 0.75rem; color: var(--ink-soft); margin: 8px 0 0; }
.export-buttons { display: flex; flex-direction: column; gap: 8px; }
.status { min-height: 1.2em; font-size: 0.8rem; color: var(--ok); margin: 12px 0 0; }
.status.err { color: #b91c1c; }

/* Explainer + FAQ */
.explainer { margin: 48px 0; }
.explainer h2, .faq h2 { font-size: 1.4rem; margin: 0 0 16px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px;
}
.card h3 { margin: 0 0 8px; font-size: 1rem; }
.card p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

.faq { margin: 48px 0 64px; max-width: 760px; }
.faq details {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 12px 16px; margin-bottom: 10px;
}
.faq summary { font-weight: 600; cursor: pointer; }
.faq p { color: var(--ink-soft); font-size: 0.92rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
  background: var(--panel);
}

/* ---------------------------------------------------------------------------
   Content / SEO pages (generated by build.js). The editor never uses these.
   --------------------------------------------------------------------------- */

/* The generated pages use a link as the header CTA; `.header-nav a` would
   otherwise out-specify `.btn-primary` and grey the label out. */
.header-nav a.btn { color: var(--ink); }
.header-nav a.btn-primary { color: #fff; }
@media (max-width: 520px) { .header-nav a.btn-primary { display: inline-block; } }

.prose { max-width: 720px; }
.prose h2 { font-size: 1.32rem; margin: 34px 0 10px; line-height: 1.3; }
.prose h3 { font-size: 1.02rem; margin: 22px 0 6px; }
.prose p { margin: 0 0 12px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--accent); }
.prose code {
  font-size: 0.88em; padding: 1px 5px; border-radius: 5px;
  background: var(--paper); border: 1px solid var(--line); color: var(--ink);
}
.prose strong { color: var(--ink); }
.prose > p, .prose li { color: var(--ink-soft); }
.prose h2 + p, .prose h3 + p { margin-top: 0; }

.breadcrumb {
  padding: 16px 0 0; font-size: 0.82rem; color: var(--ink-soft);
}
.breadcrumb a { color: var(--ink-soft); }

.page-hero { padding: 24px 0 4px; max-width: 780px; }
.page-hero h1 { font-size: 1.85rem; line-height: 1.22; margin: 0 0 12px; }
.page-hero .lede { color: var(--ink-soft); font-size: 1.02rem; margin: 0; }

.cta-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 22px 0 6px; }
.cta-row .hint { font-size: 0.82rem; color: var(--ink-soft); }

/* Symbol index grid */
.symbol-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(158px, 1fr));
  gap: 12px; margin: 20px 0 8px;
}
.symbol-tile {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 16px 10px 13px; text-decoration: none; color: inherit;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
}
.symbol-tile:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.symbol-tile .glyph { color: var(--ink); display: flex; align-items: center; justify-content: center; height: 62px; }
.symbol-tile .tname { font-weight: 700; font-size: 0.92rem; text-align: center; }
.symbol-tile .tmeta { font-size: 0.76rem; color: var(--ink-soft); text-align: center; }

/* Symbol page hero card */
.symbol-head {
  display: flex; flex-wrap: wrap; gap: 22px; align-items: center;
  padding: 22px 24px; margin: 20px 0 4px; max-width: 720px;
}
.symbol-head .glyph {
  flex: 0 0 auto; width: 132px; height: 132px;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  background:
    radial-gradient(circle, #e9e7dd 1px, transparent 1px) 0 0 / 22px 22px,
    #fefefc;
  border: 1px solid var(--line); border-radius: 10px;
}
.symbol-head .facts { flex: 1 1 300px; min-width: 240px; }
.symbol-head dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: 0.9rem; }
.symbol-head dt { color: var(--ink-soft); font-weight: 600; }
.symbol-head dd { margin: 0; font-weight: 600; }

/* Tables */
.data-table-wrap { overflow-x: auto; margin: 0 0 16px; max-width: 720px; }
table.data {
  border-collapse: collapse; width: 100%; font-size: 0.9rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
table.data th, table.data td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--line); }
table.data th { background: #fbfbf8; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--ink-soft); }
table.data tr:last-child td { border-bottom: none; }
table.data td.sym { width: 62px; color: var(--ink); }
table.data td.sym svg { display: block; }

/* Callout */
.callout {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  border-radius: 0 10px 10px 0; padding: 13px 16px; margin: 18px 0; max-width: 720px;
}
.callout p { margin: 0; font-size: 0.92rem; color: #14524d; }
.callout p + p { margin-top: 8px; }
.callout strong { color: #0b3d39; }

/* Numbered workflow steps */
ol.steps { list-style: none; counter-reset: step; padding: 0; margin: 16px 0; max-width: 720px; }
ol.steps li {
  counter-increment: step; position: relative; padding: 0 0 0 40px; margin-bottom: 14px;
  color: var(--ink-soft); font-size: 0.94rem;
}
ol.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font-weight: 700; font-size: 0.82rem;
  display: flex; align-items: center; justify-content: center;
}
ol.steps li strong { display: block; color: var(--ink); font-weight: 700; }

/* Related links */
.related { margin: 40px 0 56px; max-width: 720px; }
.related h2 { font-size: 1.1rem; margin: 0 0 12px; }
.related ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.related a {
  display: block; padding: 11px 14px; text-decoration: none; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  font-size: 0.92rem; font-weight: 600;
}
.related a:hover { border-color: var(--accent); color: var(--accent); }
.related a span { display: block; font-weight: 400; font-size: 0.82rem; color: var(--ink-soft); margin-top: 2px; }

.faq.content-faq { margin: 34px 0 0; }
.faq.content-faq h2 { font-size: 1.32rem; }

.site-footer a { color: var(--ink-soft); }
.site-footer .foot-nav { margin: 0 0 4px; }

/* Modals */
dialog {
  border: none; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 26px; max-width: 430px; width: calc(100vw - 40px);
}
dialog::backdrop { background: rgb(31 36 48 / 0.45); }
dialog h2 { margin: 0 0 10px; font-size: 1.25rem; }
dialog ul { padding-left: 20px; color: var(--ink-soft); font-size: 0.92rem; }
dialog li { margin-bottom: 6px; }
.price { color: var(--ink-soft); }
.price strong { color: var(--ink); font-size: 1.3rem; }
.modal-actions { display: flex; gap: 10px; margin-top: 18px; }
.fine { font-size: 0.82rem; color: var(--ink-soft); margin-top: 14px; }
.error { color: #b91c1c; font-size: 0.85rem; min-height: 1.2em; margin: 8px 0 0; }