:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --surface-2: #f0f0ec;
  --border: #e2e2dc;
  --text: #1c1c1a;
  --muted: #6a6a64;
  --accent: #c2410c;
  --accent-ink: #ffffff;
  --accent-soft: #fdeee6;
  --focus: #2563eb;
  --danger: #b42318;
  --ok: #15803d;
  --shadow: 0 1px 2px rgba(20, 20, 18, 0.06), 0 8px 24px rgba(20, 20, 18, 0.06);
  --radius: 12px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* block types (overlay + chips) */
  --t-heading: #7c3aed;
  --t-paragraph: #64748b;
  --t-list_item: #0d9488;
  --t-table: #2563eb;
  --t-figure: #db2777;
  --t-formula: #ca8a04;
  --t-caption: #9333ea;
  --t-code: #475569;
  --t-furniture: #a3a3a3;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #121211;
  --surface: #1b1b19;
  --surface-2: #242421;
  --border: #33332f;
  --text: #ecece6;
  --muted: #a2a29a;
  --accent: #fb923c;
  --accent-ink: #1b1109;
  --accent-soft: #3a2415;
  --focus: #60a5fa;
  --danger: #f97066;
  --ok: #4ade80;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  --t-heading: #a78bfa;
  --t-paragraph: #94a3b8;
  --t-list_item: #2dd4bf;
  --t-table: #60a5fa;
  --t-figure: #f472b6;
  --t-formula: #facc15;
  --t-caption: #c084fc;
  --t-code: #cbd5e1;
  --t-furniture: #737373;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121211;
    --surface: #1b1b19;
    --surface-2: #242421;
    --border: #33332f;
    --text: #ecece6;
    --muted: #a2a29a;
    --accent: #fb923c;
    --accent-ink: #1b1109;
    --accent-soft: #3a2415;
    --focus: #60a5fa;
    --danger: #f97066;
    --ok: #4ade80;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
    --t-heading: #a78bfa;
    --t-paragraph: #94a3b8;
    --t-list_item: #2dd4bf;
    --t-table: #60a5fa;
    --t-figure: #f472b6;
    --t-formula: #facc15;
    --t-caption: #c084fc;
    --t-code: #cbd5e1;
    --t-furniture: #737373;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 var(--sans);
  min-height: 100vh;
}
a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 6px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------------------------------------------------------------- top bar */
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 24px; border-bottom: 1px solid var(--border);
  background: var(--surface); position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 650; letter-spacing: -0.01em; }
.brand-mark { width: 30px; height: 30px; display: block; }
.brand small { display: block; font-weight: 450; color: var(--muted); font-size: 12px; letter-spacing: 0; }
.topbar nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.topbar nav a, .icon-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 8px;
  text-decoration: none; color: var(--muted); border: 0; background: none; cursor: pointer; font-size: 14px;
}
.topbar nav a:hover, .icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn svg, .topbar nav svg { width: 18px; height: 18px; }
.lang-btn { font: 600 12.5px/1 var(--mono); letter-spacing: .04em; border: 1px solid var(--border); padding: 6px 9px; }

/* ---------------------------------------------------------------- layout */
.app {
  display: grid; grid-template-columns: 330px minmax(0, 1fr); gap: 20px;
  padding: 20px 24px 32px; max-width: 1600px; margin: 0 auto;
}
.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.sidebar { padding: 18px; display: flex; flex-direction: column; gap: 16px; align-self: start; position: sticky; top: 76px; }

.intro h1 { font-size: 19px; line-height: 1.3; margin: 0 0 6px; letter-spacing: -0.015em; }
.intro p { margin: 0; color: var(--muted); font-size: 13.5px; }

.drop {
  border: 1.5px dashed var(--border); border-radius: 10px; padding: 22px 14px; text-align: center;
  cursor: pointer; background: var(--surface-2); transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop svg { width: 28px; height: 28px; color: var(--accent); }
.drop strong { display: block; margin-top: 6px; }
.drop span { color: var(--muted); font-size: 13px; }
.drop .file-name { margin-top: 8px; font: 500 13px/1.3 var(--mono); color: var(--text); word-break: break-all; }
.sample-link { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; font-size: 13px; text-decoration: underline; text-underline-offset: 2px; }

fieldset { border: 0; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
legend { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 8px; }

.segmented { display: grid; grid-template-columns: 1fr 1fr; background: var(--surface-2); border-radius: 9px; padding: 3px; gap: 3px; }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.segmented span {
  display: block; text-align: center; padding: 7px 6px; border-radius: 7px; font-size: 13px; font-weight: 550; color: var(--muted);
}
.segmented input:checked + span { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.segmented input:focus-visible + span { outline: 2px solid var(--focus); }
.hint { color: var(--muted); font-size: 12.5px; margin: 0; }

.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 13px; font-weight: 550; }
.field input[type="text"], .field input[type="password"], .field input[type="url"] {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface);
}
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.check { display: flex; gap: 9px; align-items: flex-start; font-size: 13.5px; cursor: pointer; }
.check input { margin-top: 3px; accent-color: var(--accent); }
.check small { display: block; color: var(--muted); font-size: 12px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 14px;
  border-radius: 9px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; font-weight: 550;
}
.btn:hover { background: var(--surface-2); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-primary:hover { background: var(--accent); filter: brightness(1.06); }
.btn:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.btn svg { width: 16px; height: 16px; }

.progress { height: 4px; background: var(--surface-2); border-radius: 4px; overflow: hidden; display: none; }
.progress.on { display: block; }
.progress div { height: 100%; width: 0; background: var(--accent); transition: width .15s; }

.privacy { display: flex; gap: 8px; font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--border); padding-top: 12px; }
.privacy svg { width: 16px; height: 16px; flex: none; margin-top: 2px; color: var(--ok); }

/* ---------------------------------------------------------------- main */
.main { display: flex; flex-direction: column; min-height: 70vh; overflow: hidden; }
.toolbar {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); flex-wrap: wrap;
}
.tabs { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.tabs button {
  border: 0; background: none; padding: 7px 12px; border-radius: 8px; cursor: pointer; color: var(--muted);
  font-weight: 550; font-size: 14px; white-space: nowrap;
}
.tabs button[aria-selected="true"] { background: var(--surface-2); color: var(--text); }
.tabs .count { font: 500 11px/1 var(--mono); background: var(--border); border-radius: 99px; padding: 2px 6px; margin-left: 4px; }
.toolbar .spacer { flex: 1; }

.menu { position: relative; }
.menu-list {
  position: absolute; right: 0; top: calc(100% + 6px); background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: var(--shadow); padding: 6px; min-width: 280px; display: none; z-index: 30;
}
.menu.open .menu-list { display: block; }
.menu-list button {
  display: flex; width: 100%; text-align: left; gap: 10px; align-items: baseline; border: 0; background: none;
  padding: 8px 10px; border-radius: 7px; cursor: pointer;
}
.menu-list button:hover, .menu-list button:focus-visible { background: var(--surface-2); }
.menu-list .ext { font: 600 11px/1 var(--mono); color: var(--accent); width: 38px; flex: none; text-transform: uppercase; }
.menu-list small { color: var(--muted); display: block; font-size: 12px; }

.stats { display: flex; gap: 14px; flex-wrap: wrap; padding: 8px 14px; border-bottom: 1px solid var(--border); font-size: 12.5px; color: var(--muted); }
.stats b { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.stats .warn { color: var(--danger); }

.view { flex: 1; overflow: auto; padding: 18px; }
.view[hidden] { display: none; }

.empty {
  height: 100%; min-height: 55vh; display: grid; place-items: center; text-align: center; color: var(--muted); padding: 24px;
}
.empty h2 { color: var(--text); font-size: 18px; margin: 12px 0 6px; }
.empty ul { list-style: none; padding: 0; margin: 16px auto 0; display: grid; gap: 6px; font-size: 13.5px; text-align: left; max-width: 430px; }
.empty li { display: flex; gap: 8px; }
.empty li::before { content: ""; width: 6px; height: 6px; border-radius: 2px; background: var(--accent); margin-top: 8px; flex: none; }

/* ---------------------------------------------------------------- page viewer */
.legend { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; padding: 4px 9px; border-radius: 99px;
  border: 1px solid var(--border); background: var(--surface); cursor: pointer; user-select: none;
}
.chip i { width: 9px; height: 9px; border-radius: 3px; background: var(--c); }
.chip[aria-pressed="false"] { opacity: .45; }
.viewer-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.pages { display: flex; flex-direction: column; gap: 18px; align-items: center; }
.page-wrap { position: relative; box-shadow: var(--shadow); background: #fff; border-radius: 4px; }
.page-wrap canvas { display: block; border-radius: 4px; }
.page-label { position: absolute; top: -9px; left: 10px; font: 600 11px/1 var(--mono); background: var(--surface); color: var(--muted); padding: 3px 6px; border-radius: 5px; border: 1px solid var(--border); z-index: 2; }
.box {
  position: absolute; border: 1.5px solid var(--c); background: color-mix(in srgb, var(--c) 9%, transparent);
  border-radius: 3px; cursor: pointer; padding: 0;
}
.box:hover, .box.sel { background: color-mix(in srgb, var(--c) 22%, transparent); z-index: 1; }
.box.sel { box-shadow: 0 0 0 2px var(--c); }
.box .tag {
  position: absolute; top: -1px; left: -1px; transform: translateY(-100%); font: 600 10px/1 var(--mono); color: #fff;
  background: var(--c); padding: 2px 4px; border-radius: 3px 3px 0 0; white-space: nowrap; display: none;
}
.box:hover .tag, .box.sel .tag { display: block; }
.inspector { position: sticky; top: 8px; padding: 14px; font-size: 13.5px; }
.inspector h3 { margin: 0 0 8px; font-size: 14px; display: flex; gap: 8px; align-items: center; }
.inspector .kv { display: grid; grid-template-columns: auto 1fr; gap: 3px 10px; font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }
.inspector .kv b { color: var(--text); font-weight: 500; font-family: var(--mono); font-size: 12px; word-break: break-all; }
.inspector pre { white-space: pre-wrap; margin: 0; max-height: 280px; overflow: auto; background: var(--surface-2); padding: 10px; border-radius: 8px; font: 12.5px/1.5 var(--mono); }
.inspector img { max-width: 100%; border: 1px solid var(--border); border-radius: 6px; margin-top: 10px; background: #fff; }

/* ---------------------------------------------------------------- markdown / text / json */
.md-actions { display: flex; gap: 8px; justify-content: flex-end; margin-bottom: 10px; }
.prose { max-width: 820px; margin: 0 auto; font-size: 15.5px; line-height: 1.7; }
.prose h1, .prose h2, .prose h3 { line-height: 1.25; letter-spacing: -0.01em; }
.prose table { border-collapse: collapse; margin: 14px 0; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); }
.prose img { max-width: 100%; border-radius: 6px; border: 1px solid var(--border); background: #fff; }
.prose code { font-family: var(--mono); font-size: .9em; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }
.prose pre { background: var(--surface-2); padding: 12px; border-radius: 8px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { margin: 0; padding-left: 14px; border-left: 3px solid var(--border); color: var(--muted); }
.prose .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.code-view { white-space: pre-wrap; word-break: break-word; font: 13px/1.6 var(--mono); margin: 0; }

/* ---------------------------------------------------------------- tables & gallery */
.cards { display: grid; gap: 16px; }
.card { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--surface); }
.card header { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: var(--surface-2); font-size: 13.5px; }
.card header .meta { color: var(--muted); font-size: 12.5px; }
.card header .spacer { flex: 1; }
.card .body { padding: 12px; overflow-x: auto; }
.card table { border-collapse: collapse; font-size: 13.5px; }
.card th, .card td { border: 1px solid var(--border); padding: 5px 9px; text-align: left; vertical-align: top; }
.card th { background: var(--surface-2); }
.card .crop { margin-top: 12px; max-width: min(100%, 560px); border: 1px solid var(--border); border-radius: 6px; background: #fff; }
.small-btn { font-size: 12.5px; padding: 5px 9px; border-radius: 7px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.gallery figure { margin: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--surface); }
.gallery .thumb { background: #fff; display: grid; place-items: center; height: 160px; padding: 8px; }
.gallery img { max-width: 100%; max-height: 100%; }
.gallery figcaption { padding: 8px 10px; font-size: 12.5px; display: flex; gap: 8px; align-items: center; border-top: 1px solid var(--border); }
.gallery figcaption span:not(.type-dot) { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); }
.type-dot { width: 8px; height: 8px; border-radius: 2px; background: var(--c); flex: none; }

/* ---------------------------------------------------------------- toast & footer */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px); opacity: 0;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: 14px;
  box-shadow: var(--shadow); transition: opacity .2s, transform .2s; pointer-events: none; z-index: 50; max-width: calc(100vw - 32px);
}
.toast.on { opacity: 1; transform: translateX(-50%); }
.toast.err { background: var(--danger); color: #fff; }

.site-footer { max-width: 1600px; margin: 0 auto; padding: 8px 24px 40px; color: var(--muted); font-size: 13px; }
.site-footer details { margin-top: 8px; }
.site-footer summary { cursor: pointer; }
.site-footer .features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 12px; }
.site-footer .features h3 { color: var(--text); font-size: 14px; margin: 0 0 4px; }
.site-footer .features p { margin: 0; }
.site-footer code { font-family: var(--mono); font-size: 12.5px; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1100px) {
  .viewer-grid { grid-template-columns: 1fr; }
  .inspector { position: static; }
}
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; padding: 16px; gap: 16px; }
  .sidebar { position: static; }
  .topbar { padding: 10px 16px; }
  .topbar nav .label { display: none; }
  .view { padding: 14px; }
  .site-footer { padding: 8px 16px 32px; }
}