/* ============================================================================
   Keycap Generator — UI styles
   Dark default + light theme, 3-column layout, responsive.
   Offline only: system font stack, no external assets.
   ========================================================================== */

:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica,
    Arial, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono",
    Menlo, monospace;

  --accent: #4f8cff;
  --accent-2: #ff7043;
  --danger: #ff5b5b;
  --warn: #f5a623;
  --ok: #34c759;

  --radius: 10px;
  --radius-sm: 7px;
  --gap: 14px;
  --sidebar-w: 300px;
  --right-w: 320px;
  --topbar-h: 56px;
  --shadow: 0 6px 22px rgba(0, 0, 0, 0.28);
  --trans: 160ms cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"] {
  --bg: #0e1013;
  --bg-2: #14171c;
  --panel: #191d23;
  --panel-2: #1f242c;
  --panel-3: #262c35;
  --line: #2c333d;
  --line-soft: #232931;
  --text: #e7eaee;
  --muted: #9aa4b2;
  --faint: #6b7480;
  --accent-soft: rgba(79, 140, 255, 0.16);
  --grid-1: #2b323c;
  --grid-2: #1d222a;
}

html[data-theme="light"] {
  --bg: #eef1f5;
  --bg-2: #e6eaf0;
  --panel: #ffffff;
  --panel-2: #f5f7fa;
  --panel-3: #eceff4;
  --line: #d7dce3;
  --line-soft: #e4e8ee;
  --text: #1b2027;
  --muted: #5c6673;
  --faint: #8b95a2;
  --accent-soft: rgba(79, 140, 255, 0.14);
  --grid-1: #cdd4de;
  --grid-2: #e2e7ee;
  --shadow: 0 6px 20px rgba(30, 40, 60, 0.14);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--faint); background-clip: content-box; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============================= TOP BAR ============================= */
.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand-icon {
  width: 30px; height: 30px;
  color: var(--accent);
  flex: none;
  filter: drop-shadow(0 2px 5px rgba(79, 140, 255, 0.35));
}
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-text strong { font-size: 15px; letter-spacing: 0.2px; }
.brand-text span { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.topbar-actions { display: flex; align-items: center; gap: 6px; }

/* ============================= BUTTONS ============================= */
.btn {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 12.5px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background var(--trans), border-color var(--trans), color var(--trans), transform var(--trans);
  user-select: none;
  line-height: 1;
}
.btn:hover { background: var(--panel-3); border-color: var(--faint); }
.btn:active { transform: translateY(1px); }
.btn svg { width: 16px; height: 16px; flex: none; }

.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); padding: 7px; }
.btn-ghost:hover { background: var(--panel-3); color: var(--text); border-color: transparent; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn-primary:hover { background: #3f7aff; border-color: #3f7aff; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-outline { background: transparent; }
.btn-outline:hover { background: var(--panel-3); }

.btn-block { width: 100%; }
.btn-sm { padding: 5px 9px; font-size: 11.5px; }

.btn-row { display: flex; gap: 7px; margin-top: 7px; }
.btn-row .btn { flex: 1; }

#btn-lang { font-weight: 600; letter-spacing: 0.5px; }
#btn-lang span { font-size: 12px; }

html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }

/* ============================= LAYOUT ============================= */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--right-w);
  height: calc(100vh - var(--topbar-h));
  min-height: 0;
}

.sidebar {
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-2);
  padding: var(--gap);
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  min-height: 0;
}
.sidebar.left { border-right: 1px solid var(--line); }
.sidebar.right { border-left: 1px solid var(--line); }

/* ============================= CARDS ============================= */
.card {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  flex: none;
}
.card-flush { border-radius: var(--radius); }

.card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: linear-gradient(180deg, var(--panel-2), transparent);
  border-bottom: 1px solid var(--line-soft);
}
.card-head h2 {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--muted);
  flex: 1;
}
.approx {
  font-size: 10px;
  color: var(--faint);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1px 7px;
  white-space: nowrap;
}
[data-section="profile"] .card-head { flex-wrap: wrap; }
.preset-badge {
  order: 1;
  flex-basis: 100%;
  font-size: 11px;
  color: var(--muted);
}
.preset-badge.is-custom { color: var(--text); }
.reset {
  background: transparent;
  border: none;
  color: var(--faint);
  cursor: pointer;
  padding: 3px;
  border-radius: 5px;
  display: inline-flex;
  transition: color var(--trans), background var(--trans);
}
.reset:hover { color: var(--accent); background: var(--accent-soft); }
.reset svg { width: 14px; height: 14px; }

.card-body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 10px; }

/* ============================= CONTROLS ============================= */
.prow { display: flex; flex-direction: column; gap: 4px; }
.prow-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 20px;
}
.prow-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text);
  font-size: 12px;
  cursor: default;
}
.prow-value { display: inline-flex; align-items: center; gap: 4px; }
.unit { color: var(--faint); font-size: 11px; }

.tip {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--faint);
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
  cursor: help;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: all var(--trans);
}
.tip:hover { color: var(--accent); border-color: var(--accent); }

input[type="range"].slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 4px;
  background: var(--panel-3);
  outline: none;
  cursor: pointer;
}
input[type="range"].slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--panel);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  transition: transform var(--trans);
}
input[type="range"].slider::-webkit-slider-thumb:hover { transform: scale(1.15); }
input[type="range"].slider::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--panel);
}

input[type="number"].num {
  width: 62px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  padding: 4px 6px;
  font-size: 12px;
  font-family: var(--mono);
  text-align: right;
}
input[type="number"].num:focus { border-color: var(--accent); outline: none; }

input[type="text"], select, .select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--text);
  padding: 7px 9px;
  font-size: 12.5px;
  font-family: inherit;
}
input[type="text"]:focus, select:focus { border-color: var(--accent); outline: none; }
input[type="text"]::placeholder { color: var(--faint); }

.field { display: flex; flex-direction: column; gap: 5px; }
.field > label { font-size: 12px; color: var(--muted); }

.field-row { display: flex; gap: 8px; align-items: flex-end; }
.field-row .field { flex: 1; }

/* iOS-style switch */
.switch { position: relative; display: inline-flex; align-items: center; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch .track {
  width: 40px; height: 23px;
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-radius: 20px;
  position: relative;
  cursor: pointer;
  transition: background var(--trans), border-color var(--trans);
  display: inline-block;
}
.switch .knob {
  position: absolute;
  top: 2px; left: 2px;
  width: 17px; height: 17px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transition: transform var(--trans);
}
.switch input:checked + .track { background: var(--accent); border-color: var(--accent); }
.switch input:checked + .track .knob { transform: translateX(17px); }
.switch input:focus-visible + .track { outline: 2px solid var(--accent); outline-offset: 2px; }

.prow-toggle {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

/* Segmented control */
.segmented {
  display: flex;
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}
.seg {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  padding: 6px 4px;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--trans), color var(--trans);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  white-space: nowrap;
}
.seg:hover { color: var(--text); }
.seg.is-active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  font-weight: 600;
}

/* stepper */
.stepper { display: inline-flex; align-items: center; gap: 2px; }
.stepper .num { width: 58px; }
.stepper button {
  width: 24px; height: 26px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.stepper button:hover { background: var(--panel-3); }
.stepper button:disabled { opacity: 0.4; cursor: not-allowed; }

.derived {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  background: var(--accent-soft);
  border: 1px dashed var(--accent);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12px;
}
.derived .k { color: var(--muted); }
.derived .v { font-family: var(--mono); color: var(--text); font-weight: 600; }

.hint { color: var(--muted); font-size: 11.5px; margin: 0; line-height: 1.5; }
.hint-sm { color: var(--faint); font-size: 10.5px; margin: 0; }

/* ============================= TABS ============================= */
.tabs {
  display: flex;
  background: var(--panel-3);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}
.tab {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 6px 4px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  transition: background var(--trans), color var(--trans);
}
.tab:hover { color: var(--text); }
.tab.is-active { background: var(--panel); color: var(--text); font-weight: 600; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); }
.tabpanel { display: flex; flex-direction: column; gap: 10px; margin-top: 11px; }
.is-hidden { display: none !important; }

/* ============================= SVG GALLERY ============================= */
.svg-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.svg-thumb {
  aspect-ratio: 1;
  background: var(--panel-2);
  border: 2px solid var(--line);
  border-radius: 8px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: border-color var(--trans);
}
.svg-thumb:hover { border-color: var(--faint); }
.svg-thumb.is-active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.svg-thumb svg, .svg-thumb img { width: 100%; height: 100%; object-fit: contain; }
.svg-thumb .name {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  font-size: 9px;
  padding: 1px 3px;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.svg-gallery:empty::after {
  content: attr(data-empty);
  grid-column: 1 / -1;
  color: var(--faint);
  font-size: 11.5px;
}

/* ============================= SVG IMPORT ============================= */
.svg-gallery-item { min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.svg-gallery-item .svg-thumb { width: 100%; }
.svg-thumb-edit { width: 100%; color: var(--muted); }
.svg-import-dialog {
  width: min(1100px, calc(100vw - 40px));
  max-width: none;
  max-height: calc(100dvh - 40px);
  padding: 0;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 20px 80px #0006;
  overflow: hidden;
}
.svg-import-dialog[open] { display: flex; flex-direction: column; }
.svg-import-dialog::backdrop { background: #0009; backdrop-filter: blur(3px); }
.svg-import-head, .svg-import-footer { flex: none; }
.svg-import-filename { margin: 3px 0 0; max-width: 70vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); font-size: 12px; }
.svg-import-body { padding: 18px; overflow-y: auto; min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(370px, 1fr); gap: 16px 20px; }
.svg-import-previews { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-self: start; position: sticky; top: 0; }
.svg-import-preview { margin: 0; min-width: 0; }
.svg-import-preview figcaption { font-size: 12px; font-weight: 600; margin-bottom: 8px; }
.svg-import-canvas {
  position: relative; aspect-ratio: 1; border: 1px solid var(--line); border-radius: 9px; overflow: hidden;
  background-color: #f7f8fa;
  background-image: conic-gradient(#e0e4e9 25%, transparent 0 50%, #e0e4e9 0 75%, transparent 0);
  background-size: 16px 16px;
}
.svg-import-canvas > img, .svg-import-canvas > svg { position: absolute; width: 100%; height: 100%; inset: 0; object-fit: contain; }
.svg-import-highlight { pointer-events: none; }
.svg-import-parts { min-width: 0; }
.svg-import-parts-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.svg-import-parts h3 { margin: 0; font-size: 13px; }
.svg-import-group, .svg-import-invert { display: inline-flex; gap: 6px; align-items: center; font-size: 12px; cursor: pointer; }
.svg-import-group { color: var(--muted); }
.svg-import-dialog input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; margin: 0; flex: none; }
.svg-import-group[hidden], .svg-import-mixed[hidden], .svg-import-error[hidden] { display: none; }
.svg-import-rows { display: flex; flex-direction: column; gap: 6px; max-height: 390px; overflow-y: auto; padding: 2px; }
.svg-import-part { display: grid; grid-template-columns: 38px minmax(100px, 1fr) auto; gap: 9px; align-items: center; padding: 8px; background: var(--panel-2); border: 1px solid var(--line-soft); border-radius: 8px; }
.svg-import-part:hover, .svg-import-part:focus-within { border-color: var(--accent); }
.svg-import-part-thumb { width: 38px; height: 38px; padding: 2px; background: #e8ebef; border-radius: 5px; }
.svg-import-part-label { min-width: 0; display: flex; flex-direction: column; gap: 2px; font-size: 12px; }
.svg-import-part-title { display: flex; align-items: center; gap: 5px; line-height: 1.3; }
.svg-import-swatch { display: inline-block; width: 9px; height: 9px; border: 1px solid #8888; border-radius: 50%; flex: none; }
.svg-import-part.is-off .svg-import-part-label { color: var(--muted); }
.svg-import-part.is-off .svg-import-part-thumb { opacity: .6; }
.svg-import-part-label .hint { font-size: 10.5px; }
.svg-import-mixed { font-size: 10px; color: var(--muted); }
.svg-import-dialog .btn { background: var(--panel-2); color: var(--text); }
.svg-import-dialog .btn:hover { background: var(--panel-3); }
.svg-import-dialog .btn-ghost { background: transparent; color: var(--muted); }
.svg-import-dialog .btn-primary { background: var(--accent); color: #fff; }
.svg-import-dialog .btn-primary:hover { background: #3f7aff; }
.svg-import-segmented { flex-wrap: nowrap; }
.svg-import-segmented .seg { min-width: 0; padding: 6px 7px; font-size: 11px; }
.svg-import-segmented .seg.is-active { background: var(--panel); color: var(--text); box-shadow: inset 0 0 0 1px var(--accent); }
.svg-import-options { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(200px, 1fr) auto auto; align-items: center; gap: 16px 24px; border-top: 1px solid var(--line-soft); padding-top: 16px; }
.svg-import-width { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; }
.svg-import-width label { font-size: 12px; font-weight: 600; }
.svg-import-width output { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.svg-import-width .slider, .svg-import-width .hint { grid-column: 1 / -1; margin: 0; }
.svg-import-width .hint { max-width: 560px; font-size: 11px; }
.svg-import-bulk { display: flex; flex-wrap: wrap; gap: 6px; }
.svg-import-warnings, .svg-import-error { grid-column: 1 / -1; }
.svg-import-warnings:empty { display: none; }
.svg-import-warnings p { margin: 0; padding: 8px 10px; background: var(--accent-soft); border-radius: 6px; color: var(--text); }
.svg-import-error { margin: 0; color: var(--text); padding: 10px; border: 1px solid var(--warn); border-radius: 7px; }
.svg-import-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 13px 18px; border-top: 1px solid var(--line); background: var(--panel-2); }
.svg-import-summary { margin: 0; font-size: 12px; color: var(--muted); }
.svg-import-actions { display: flex; gap: 8px; }
.svg-import-actions .btn { padding: 9px 18px; }
@media (max-width: 1100px) {
  .svg-import-body { grid-template-columns: minmax(0, 1fr) minmax(360px, 1fr); gap: 14px; padding: 14px; }
  .svg-import-previews { grid-template-columns: 1fr; }
  .svg-import-canvas { max-height: 220px; aspect-ratio: auto; height: 22vh; min-height: 120px; }
  .svg-import-options { grid-template-columns: 1fr auto; }
  .svg-import-bulk { grid-column: 1 / -1; }
}
@media (max-width: 700px) {
  .svg-import-dialog { width: calc(100vw - 16px); max-height: calc(100dvh - 16px); }
  .svg-import-body { grid-template-columns: minmax(0, 1fr); }
  .svg-import-previews { grid-template-columns: 1fr 1fr; position: static; }
  .svg-import-canvas { height: auto; min-height: 0; max-height: none; aspect-ratio: 1; }
  .svg-import-rows { max-height: 280px; }
  .svg-import-part { grid-template-columns: 30px minmax(80px, 1fr) auto; gap: 6px; padding: 6px; }
  .svg-import-part-thumb { width: 30px; height: 30px; }
  .svg-import-segmented .seg { padding: 7px 5px; font-size: 10.5px; }
  .svg-import-width { grid-template-columns: 1fr; }
  .svg-import-footer { padding: 12px; flex-wrap: wrap; }
  .svg-import-actions { margin-left: auto; }
}

/* ============================= VIEWPORT ============================= */
.viewport-wrap { position: relative; min-width: 0; min-height: 0; background: var(--bg); }
.viewport { position: absolute; inset: 0; }
.viewport canvas { display: block; width: 100%; height: 100%; }

.view-buttons {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 3px;
  z-index: 5;
}
.btn-seg {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 6px 13px;
  border-radius: 6px;
  font-size: 12px;
}
.btn-seg:hover { background: var(--panel-3); color: var(--text); }
.btn-seg.is-active { background: var(--accent); color: #fff; }

.viewport-overlay {
  position: absolute;
  top: 12px; left: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: min(46%, 420px);
  z-index: 5;
  pointer-events: none;
}
.status-line {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 11px;
  font-size: 12px;
  color: var(--text);
  align-self: flex-start;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent);
  flex: none;
  transition: background var(--trans);
}
.status-line.is-busy .status-dot { background: var(--accent); animation: pulse 1s ease-in-out infinite; }
.status-line.is-warn .status-dot { background: var(--warn); }
.status-line.is-error .status-dot { background: var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.warning-chips { display: flex; flex-wrap: wrap; gap: 6px; pointer-events: auto; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: color-mix(in srgb, var(--warn) 16%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--warn) 45%, transparent);
  color: var(--text);
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 11px;
}
.chip::before { content: "!"; font-weight: 700; color: var(--warn); }
.chip.err {
  background: color-mix(in srgb, var(--danger) 16%, var(--panel));
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
}
.chip.err::before { color: var(--danger); }

.viewer-toolbar {
  position: absolute;
  right: 12px; bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 5;
}
.stats {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  white-space: nowrap;
}

.topview {
  position: absolute;
  left: 12px; bottom: 52px;
  width: 260px;
  max-width: calc(100% - 24px);
  max-height: calc(100% - 170px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px;
  z-index: 5;
  user-select: none;
}
.topview-toggle {
  width: 100%;
  display: block;
  border: 0;
  border-radius: 5px;
  background: var(--panel-2);
  color: var(--text);
  padding: 5px 8px;
  text-align: left;
  font-size: 12px;
  cursor: pointer;
}
.topview-toggle:hover { background: var(--panel-3); }
.topview-toggle { flex: none; }
.topview-drawings { overflow-y: auto; min-height: 0; scrollbar-width: thin; }
.topview-drawings[hidden] { display: none; }
.topview h3 { margin: 7px 0 2px; font-size: 11px; font-weight: 500; color: var(--muted); }
.topview svg { width: 100%; height: auto; display: block; }
.topview text { font: 11px var(--font); fill: var(--text); }
.topview .diagram-bottom { fill: none; stroke: var(--text); stroke-width: 1.4; }
.topview .diagram-top { fill: var(--accent-soft); stroke: var(--text); stroke-width: 1.4; stroke-dasharray: 4 3; }
.topview .diagram-stem { fill: none; stroke: var(--muted); stroke-width: 1.2; }
.topview .diagram-dimension { fill: none; stroke: var(--muted); stroke-width: 1; }
.topview .diagram-reference { fill: none; stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 2; }
.topview .diagram-angle { fill: none; stroke: var(--text); stroke-width: 2; }
.topview .diagram-angle-end { fill: var(--text); }
.topview.is-collapsed { width: 180px; }

/* ============================= DEPTH PREVIEW ============================= */
/* Cross-section under the legend Depth slider.  Drawn 1 SVG unit = 1 CSS px,
   so the 10.5 px labels stay readable at every sidebar width. */
.depth-preview {
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 1px 4px;
  overflow: hidden;
  transition: border-color var(--trans);
}
.depth-preview.is-warn {
  border-color: color-mix(in srgb, var(--danger) 60%, var(--line));
}
.depth-preview svg { display: block; width: 100%; height: auto; }
.depth-preview text {
  font-family: var(--font);
  font-size: 10.5px;
  fill: var(--text);
}
.depth-preview .depth-summary-label { fill: var(--muted); }
.depth-preview .depth-summary-value {
  fill: var(--text);
  font-family: var(--mono);
  font-weight: 600;
}
.depth-preview .depth-surface {
  fill: none;
  stroke: var(--text);
  stroke-width: 1.4;
  stroke-linecap: round;
}
.depth-preview .depth-inner {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.1;
  stroke-linecap: round;
}
.depth-preview .depth-edge {
  fill: none;
  stroke: var(--text);
  stroke-width: 1;
  opacity: 0.45;
}
.depth-preview .depth-cut {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1;
  stroke-dasharray: 3 3;
  opacity: 0.6;
}
.depth-preview .depth-cavity-fill { fill: var(--panel-2); }
.depth-preview .depth-hatch-line {
  stroke: var(--faint);
  stroke-width: 0.7;
  opacity: 0.55;
}
.depth-preview .depth-band {
  stroke: color-mix(in srgb, var(--text) 50%, transparent);
  stroke-width: 1;
  stroke-linejoin: round;
}
.depth-preview .depth-groove {
  stroke: var(--muted);
  stroke-width: 1;
  stroke-dasharray: 3 2;
  stroke-linejoin: round;
}
.depth-preview .depth-dim {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1;
}
.depth-preview .depth-dim.is-depth { stroke: var(--accent); }
.depth-preview .depth-dim.is-top { opacity: 0.85; }
.depth-preview.is-warn .depth-dim.is-remaining { stroke: var(--danger); }
.depth-preview .depth-warning {
  fill: var(--danger);
  font-weight: 600;
}
.depth-preview .depth-note,
.depth-preview .depth-none { fill: var(--muted); }

/* ============================= EXPORT FOOTER ============================= */
.export-footer {
  position: sticky;
  bottom: calc(-1 * var(--gap));
  margin-top: auto;
  padding-top: 4px;
  background: linear-gradient(180deg, transparent, var(--bg-2) 30%);
}

/* ============================= MODAL ============================= */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(3px); }
.modal-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  width: min(720px, 100%);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line-soft);
}
.modal-head h2 { margin: 0; font-size: 15px; }
.modal-body { padding: 18px; overflow-y: auto; }
.modal-body p { color: var(--muted); margin-top: 0; }
.help-diagram {
  width: 100%;
  max-width: 360px;
  display: block;
  margin: 8px auto 18px;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 8px;
}
.help-list { margin: 0; }
.help-list dt { font-weight: 700; margin-top: 14px; color: var(--text); }
.help-list dd { margin: 4px 0 0; color: var(--muted); line-height: 1.6; }

/* ============================= RESPONSIVE ============================= */
@media (max-width: 1280px) {
  :root { --sidebar-w: 270px; --right-w: 290px; }
}

@media (max-width: 1000px) {
  body { overflow: auto; }
  .layout {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
  }
  .sidebar { max-height: none; overflow: visible; }
  .sidebar.left { border-right: none; border-bottom: 1px solid var(--line); }
  .sidebar.right { border-left: none; border-top: 1px solid var(--line); }
  .viewport-wrap {
    height: 62vh;
    min-height: 420px;
    order: -1;
    border-bottom: 1px solid var(--line);
  }
  .export-footer { position: static; }
}

@media (max-width: 620px) {
  .brand-text span { display: none; }
  .viewport-overlay { max-width: 70%; }
  .svg-gallery { grid-template-columns: repeat(2, 1fr); }
}

/* Keep feedback clear of the view selector and the diagram on narrow screens. */
.viewport-overlay { top: 58px; max-width: calc(100% - 24px); }
.warning-chips { max-width: 430px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
input.slider:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
@media (max-width: 620px) {
  .viewer-toolbar { bottom: 12px; }
  .topbar { padding-inline: 10px; }
  .segmented { flex-wrap: wrap; }
  .seg { min-width: 65px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}