:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #f1f3f6;
  --text: #1c2330;
  --muted: #6b7484;
  --border: #dfe3e9;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --ok: #1a8a4a;
  --ok-bg: #e5f5ec;
  --warn: #9a6400;
  --warn-bg: #fff4dc;
  --danger: #c93434;
  --danger-bg: #fdecec;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181d;
    --panel: #1d2128;
    --panel-2: #252a33;
    --text: #e3e7ee;
    --muted: #8e97a6;
    --border: #323844;
    --accent: #5b8cff;
    --ok: #4cc57e;
    --ok-bg: #173325;
    --warn: #e8b04a;
    --warn-bg: #3a2e14;
    --danger: #f06a6a;
    --danger-bg: #3d1d1f;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
#app { height: 100%; }
h1, h2, h3 { margin: 0 0 8px; line-height: 1.2; }
h1 { font-size: 20px; }
h3 { font-size: 14px; }
code, pre { font-family: var(--mono); font-size: 12.5px; }
code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }
pre { margin: 0; padding: 8px 10px; background: var(--panel-2); border-radius: 6px; overflow-x: auto; flex: 1; }
a { color: var(--accent); }

input, select, textarea, button { font: inherit; color: inherit; }
input:not([type='checkbox']):not([type='radio']), select, textarea {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  min-height: 30px;
  max-width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); outline-offset: -1px; border-color: var(--accent); }
textarea { width: 100%; resize: vertical; font-family: var(--mono); font-size: 12.5px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; min-height: 30px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--panel); cursor: pointer; white-space: nowrap;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.ghost { background: transparent; }
.btn.ghost.on { background: var(--panel-2); }
.btn.danger { color: var(--danger); }
.btn.danger:not(.ghost) { border-color: var(--danger); }
.btn.small { padding: 2px 8px; min-height: 24px; font-size: 12.5px; }
.icon {
  border: none; background: transparent; cursor: pointer; color: var(--muted);
  width: 26px; height: 26px; border-radius: 6px; font-size: 15px; line-height: 1;
}
.icon:hover:not(:disabled) { background: var(--panel-2); color: var(--text); }
.icon:disabled { opacity: 0.3; cursor: default; }
.icon.danger:hover { color: var(--danger); }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.warn-text { color: var(--warn); }
.row { display: flex; gap: 8px; align-items: center; }
.spacer { flex: 1; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.badge {
  display: inline-block; padding: 0 6px; border-radius: 10px; font-size: 11.5px; line-height: 18px;
  background: var(--panel-2); color: var(--muted); white-space: nowrap;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--warn); flex: none; }
.alert { padding: 10px 12px; border-radius: 6px; margin: 0 0 12px; }
.alert.warn { background: var(--warn-bg); color: var(--warn); }
.alert.error { background: var(--danger-bg); color: var(--danger); }
.chk, .radio { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.radio { align-items: flex-start; }
.radio input { margin-top: 3px; }
.inline-form { display: flex; gap: 6px; }
.inline-form input { flex: 1; min-width: 0; }
.empty-state { padding: 60px 24px; text-align: center; color: var(--muted); }
.empty-state h2 { color: var(--text); }

/* login */
.login { display: grid; place-items: center; height: 100%; padding: 16px; }
.login form { width: min(360px, 100%); display: grid; gap: 14px; }
.login label { display: grid; gap: 6px; }

/* layout */
.layout { display: grid; grid-template-columns: 240px 1fr; height: 100%; }
.sidebar {
  background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 10px; padding: 14px 12px; min-height: 0;
}
.brand { font-weight: 700; font-size: 15px; padding: 2px 6px 8px; }
.nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); padding: 0 6px; }
.project-list { display: flex; flex-direction: column; gap: 2px; overflow-y: auto; }
.project-list a {
  padding: 6px 8px; border-radius: 6px; color: var(--text); text-decoration: none;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.project-list a:hover { background: var(--panel-2); }
.project-list a.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); font-weight: 600; }
.sidebar-foot { margin-top: auto; display: flex; justify-content: space-between; align-items: flex-end; gap: 8px; padding: 0 4px; }
.whoami { display: grid; gap: 1px; min-width: 0; }
.project-list a { display: flex; align-items: baseline; gap: 6px; }
.project-name { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.owner { color: var(--muted); font-size: 11px; font-weight: 400; }
.main { min-width: 0; min-height: 0; overflow: auto; }

/* project */
.project { display: flex; flex-direction: column; min-height: 100%; padding: 18px 22px 0; }
.project-head { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; justify-content: space-between; }
.project-head h1 { margin: 0; }
.embed-line { display: flex; gap: 8px; align-items: center; min-width: 0; flex-wrap: wrap; }
.url { max-width: 420px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; vertical-align: middle; }
.embed-help { margin-top: 12px; display: grid; gap: 8px; }
.embed-help p { margin: 0; }
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin: 14px 0 16px; }
.tabs a {
  padding: 8px 14px; color: var(--muted); text-decoration: none; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs a:hover { color: var(--text); }
.tabs a.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

/* styles tab */
.styles-tab { display: grid; grid-template-columns: 220px 1fr; gap: 16px; flex: 1; min-height: 0; padding-bottom: 18px; height: calc(100vh - 150px); }
.sheet-list { display: flex; flex-direction: column; gap: 3px; overflow-y: auto; }
.sheet-item {
  display: flex; align-items: center; gap: 6px; text-align: left;
  padding: 7px 9px; border: 1px solid transparent; border-radius: 6px; background: transparent; cursor: pointer;
}
.sheet-item:hover { background: var(--panel); }
.sheet-item.active { background: var(--panel); border-color: var(--border); font-weight: 600; }
.sheet-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 13px; }
.sheet-list .inline-form { margin-top: 8px; }
.sheet-editor { display: flex; flex-direction: column; min-width: 0; min-height: 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.toolbar { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.name-input { font-family: var(--mono); font-weight: 600; width: 180px; }
.publish-bar { display: flex; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
.publish-bar input { flex: 1; }
.status { font-size: 12px; color: var(--muted); }
.status.dirty, .status.saving { color: var(--warn); }
.status.error { color: var(--danger); }
.editor-wrap { display: flex; flex: 1; min-height: 0; }
.editor-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.monaco { flex: 1; min-height: 240px; }
.diff-bar { display: flex; align-items: center; justify-content: space-between; padding: 6px 10px; background: var(--warn-bg); color: var(--warn); font-size: 13px; }
.history { width: 280px; border-left: 1px solid var(--border); padding: 12px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; }
.version { border: 1px solid var(--border); border-radius: 6px; padding: 8px; display: grid; gap: 4px; }
.version.current { border-color: var(--ok); }
.version-head { display: flex; gap: 6px; align-items: center; }
.version-head .muted { margin-left: auto; }
.version-note { font-size: 12.5px; }
.version-actions { display: flex; gap: 4px; flex-wrap: wrap; }

/* rules tab */
.rules-tab { display: flex; flex-direction: column; gap: 12px; padding-bottom: 90px; max-width: 980px; }
.explain { color: var(--muted); }
.rule { padding: 0; }
.rule.disabled { opacity: 0.6; }
.rule-head { display: flex; align-items: center; gap: 6px; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.rule-num {
  width: 24px; height: 24px; border-radius: 50%; background: var(--panel-2); color: var(--muted);
  display: grid; place-items: center; font-size: 12px; font-weight: 600; flex: none;
}
.rule-name { flex: 1; font-weight: 600; border-color: transparent !important; background: transparent !important; }
.rule-name:hover { border-color: var(--border) !important; }
.switch { display: inline-flex; gap: 4px; align-items: center; font-size: 12px; color: var(--muted); margin-right: 6px; cursor: pointer; }
.rule-body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 8px; }
.rule-line { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.rule-line.then { padding-top: 8px; border-top: 1px dashed var(--border); margin-top: 2px; }
.kw { font-weight: 700; font-size: 12px; letter-spacing: 0.04em; color: var(--accent); }
.rule-warn { font-size: 12.5px; color: var(--warn); }
.variants { display: grid; gap: 6px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--panel-2); }
.variant { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.variant .num { width: 72px; }
.prob { min-width: 52px; font-variant-numeric: tabular-nums; font-weight: 600; color: var(--accent); }
.variant-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.add-cond { align-self: flex-start; color: var(--accent); border-style: dashed !important; }
.fallback { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.cond { border: 1px solid var(--border); border-radius: 6px; background: var(--panel-2); }
.cond.negated { border-color: var(--danger); }
.cond-head { display: flex; align-items: center; gap: 8px; padding: 4px 6px 0 10px; }
.cond-type { font-weight: 600; font-size: 12.5px; }
.neg { font-size: 11.5px; color: var(--muted); display: inline-flex; gap: 3px; align-items: center; cursor: pointer; }
.cond.negated .neg { color: var(--danger); font-weight: 700; }
.cond-head .icon { margin-left: auto; }
.cond-body { display: flex; align-items: center; gap: 6px 10px; flex-wrap: wrap; padding: 6px 10px 10px; }
.cond-body input.short { width: 140px; }
.cond-body input.num { width: 70px; }
.cond-body textarea { max-width: 420px; }
.tz { max-width: 220px; }
.tags { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; flex: 1; min-width: 260px; }
.tag {
  display: inline-flex; align-items: center; gap: 4px; padding: 2px 4px 2px 8px; border-radius: 12px;
  background: var(--panel); border: 1px solid var(--border); font-size: 12.5px;
}
.tag small { color: var(--muted); font-family: var(--mono); }
.tag button { border: none; background: none; cursor: pointer; color: var(--muted); padding: 0 3px; }
.tag button:hover { color: var(--danger); }
.tags input { flex: 1; min-width: 180px; }
.savebar {
  position: fixed; bottom: 16px; left: calc(240px + 22px); right: 22px; max-width: 980px;
  display: flex; align-items: center; gap: 8px; justify-content: flex-end;
  background: var(--panel); border: 1px solid var(--accent); border-radius: var(--radius); padding: 10px 14px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.15);
  transform: translateY(150%); transition: transform 0.2s;
}
.savebar.visible { transform: none; }
.savebar span { margin-right: auto; }

/* simulator */
.sim-tab { display: grid; grid-template-columns: 340px 1fr; gap: 16px; align-items: start; padding-bottom: 24px; }
.sim-form { display: grid; gap: 10px; position: sticky; top: 0; }
.sim-form label:not(.chk) { display: grid; gap: 4px; min-width: 0; }
.sim-form input:not([type='checkbox']), .sim-form select, .sim-form textarea { width: 100%; }
.sim-form .row input { width: auto; min-width: 0; }
.sim-form .row input { flex: 1; }
.sim-result { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.ctx { display: grid; gap: 4px; }
.result-line { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.steps { display: flex; flex-direction: column; gap: 6px; }
.step { border: 1px solid var(--border); border-left-width: 4px; border-radius: 6px; padding: 8px 12px; background: var(--panel); }
.step.ok { border-left-color: var(--ok); }
.step.no { border-left-color: var(--danger); }
.step.off { opacity: 0.6; }
.step-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.step-icon { font-weight: 700; width: 14px; }
.step.ok .step-icon { color: var(--ok); }
.step.no .step-icon { color: var(--danger); }
.variants-info { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: center; margin: 6px 0 0 22px; }
.variants-info .picked { font-weight: 700; color: var(--ok); }
.checks { list-style: none; margin: 6px 0 0; padding: 0 0 0 22px; display: grid; gap: 2px; font-size: 13px; }
.checks li.ok > span:first-child { color: var(--ok); }
.checks li.no > span:first-child { color: var(--danger); }
.sim-css { height: 300px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; }

/* settings */
.settings-tab { display: grid; gap: 16px; max-width: 760px; padding-bottom: 24px; }
.form { display: grid; gap: 14px; }
.form label:not(.radio) { display: grid; gap: 5px; }
fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 10px 14px; display: grid; gap: 10px; margin: 0; }
legend { padding: 0 4px; font-weight: 600; }
.danger-zone { border-color: var(--danger); }

/* toasts */
.toasts { position: fixed; top: 14px; right: 14px; display: grid; gap: 8px; z-index: 100; }
.toast {
  background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--ok);
  border-radius: 6px; padding: 10px 14px; box-shadow: 0 6px 20px rgb(0 0 0 / 0.12); max-width: 420px;
}
.toast.error { border-left-color: var(--danger); }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
  .project-list { flex-direction: row; flex-wrap: wrap; }
  .styles-tab, .sim-tab { grid-template-columns: 1fr; height: auto; }
  .sheet-editor { height: 70vh; }
  .history { display: none; }
  .savebar { left: 16px; right: 16px; }
  .sim-form { position: static; }
}