/* ==========================================================================
   KHTHON — design tokens
   Neutral black/grey (dark) and white/grey (light) surfaces, lit by two
   mineral accents: amber (magma glow) and verdigris (oxidised copper).
   Utility-first — the workspaces stay quiet so the seven tools stay
   legible all day.
   ========================================================================== */

:root {
  /* neutral surfaces */
  --bg-0: #0a0a0a;
  --bg-1: #121212;
  --bg-2: #191919;
  --bg-3: #222222;
  --bg-4: #2c2c2c;
  --border: #3a3a3a;
  --border-soft: #262626;

  /* text */
  --text-0: #f2f2f0;
  --text-1: #b8b8b5;
  --text-2: #8a8a86;
  --text-3: #5c5c58;

  /* accents */
  --amber: #e8a33d;
  --amber-soft: #4a3a20;
  --verdigris: #5fbfa0;
  --verdigris-soft: #1f3a34;
  --rust: #d1633f;
  --rust-soft: #452420;

  /* type */
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* layout */
  --sidebar-w: 236px;
  --topbar-h: 56px;
  --radius: 6px;
  --radius-lg: 10px;

  /* transparency-grid checker (image converter empty state) */
  --checker: #242424;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }

/* ---------- light theme ----------
   Same accent hues, deepened slightly for AA contrast on a white/grey surface. */
html[data-theme="light"] {
  color-scheme: light;

  --bg-0: #ffffff;
  --bg-1: #ffffff;
  --bg-2: #f2f2f0;
  --bg-3: #e8e8e5;
  --bg-4: #dadad6;
  --border: #d4d4cf;
  --border-soft: #e6e6e2;

  --text-0: #16160f;
  --text-1: #45453e;
  --text-2: #5c5c54;
  --text-3: #85857a;

  --amber: #a8701c;
  --amber-soft: #f5e3c2;
  --verdigris: #2c8a6c;
  --verdigris-soft: #d9efe6;
  --rust: #ac4e2b;
  --rust-soft: #f6ddd0;

  --checker: #e6e6e2;
}

body {
  margin: 0;
  background: var(--bg-0);
  background-image:
    repeating-linear-gradient(180deg, rgba(128,128,128,0.02) 0px, rgba(128,128,128,0.02) 1px, transparent 1px, transparent 3px);
  color: var(--text-0);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--amber-soft); color: var(--text-0); }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 200;
  background: var(--amber);
  color: #241a08;
  font-weight: 600;
  font-size: 13px;
  padding: 10px 16px;
  border-radius: var(--radius);
  transition: top 0.15s;
}
.skip-link:focus { top: 12px; }

.theme-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-1);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { color: var(--amber); border-color: var(--amber); }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---------- layout shell ---------- */

.app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 18px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-1);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--text-0);
}

.core-sample {
  display: inline-flex;
  flex-direction: column;
  width: 14px;
  height: 22px;
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.core-sample i { display: block; flex: 1; }
.core-sample i:nth-child(1) { background: #3a2f22; }
.core-sample i:nth-child(2) { background: var(--amber); }
.core-sample i:nth-child(3) { background: #6b5636; }
.core-sample i:nth-child(4) { background: var(--verdigris); }
.core-sample i:nth-child(5) { background: #2c3b37; }
.core-sample i:nth-child(6) { background: var(--rust); }

.cmdbox {
  flex: 1;
  max-width: 420px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  color: var(--text-2);
  transition: border-color 0.15s;
}
.cmdbox:focus-within { border-color: var(--amber); color: var(--text-1); }
.cmdbox-icon { flex-shrink: 0; }
.cmdbox input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-0);
  font-family: var(--font-body);
  font-size: 13px;
  outline: none;
}
.cmdbox input::placeholder { color: var(--text-3); }
.cmdbox kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
}

.topbar-link {
  margin-left: auto;
  color: var(--text-2);
  font-size: 12.5px;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 10px;
  transition: color 0.15s, border-color 0.15s;
  flex-shrink: 0;
}
.topbar-link:hover { color: var(--amber); border-color: var(--amber); }

.shell { display: flex; flex: 1; min-height: 0; }

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  border-right: 1px solid var(--border-soft);
  background: var(--bg-1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
}

#nav-list { list-style: none; margin: 0; padding: 12px; display: flex; flex-direction: column; gap: 2px; }
#nav-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius);
  color: var(--text-1);
  font-size: 13.5px;
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
#nav-list a svg { flex-shrink: 0; opacity: 0.75; }
#nav-list a:hover { background: var(--bg-2); color: var(--text-0); }
#nav-list a.active {
  background: var(--bg-2);
  color: var(--amber);
  border-left-color: var(--amber);
}
#nav-list a.active svg { opacity: 1; }

.sidebar-foot {
  padding: 14px;
  border-top: 1px solid var(--border-soft);
  color: var(--text-3);
  font-size: 11.5px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.main { flex: 1; min-width: 0; padding: 28px 32px 60px; }

.view { display: none; max-width: 1180px; }
.view.active { display: block; animation: viewin 0.18s ease; }
@keyframes viewin { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.view-head { margin-bottom: 20px; }
.view-head h1 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0 0 4px;
  color: var(--text-0);
}
.view-head p { margin: 0; color: var(--text-2); font-size: 13.5px; }
.view-head kbd { font-family: var(--font-mono); background: var(--bg-3); border: 1px solid var(--border); border-radius: 3px; padding: 1px 5px; font-size: 11.5px; }

/* ---------- overview ---------- */

.hero { max-width: 720px; margin-bottom: 32px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--verdigris);
  margin: 0 0 10px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 12px;
  color: var(--text-0);
}
.hero-sub { color: var(--text-1); font-size: 14.5px; line-height: 1.6; margin: 0; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}
.tool-card {
  display: block;
  background: var(--bg-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent, var(--amber));
  opacity: 0;
  transition: opacity 0.15s;
}
.tool-card:hover { border-color: var(--border); background: var(--bg-2); transform: translateY(-1px); }
.tool-card:hover::before { opacity: 1; }
.tool-card .tc-icon {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 7px;
  background: var(--bg-3);
  color: var(--accent, var(--amber));
  margin-bottom: 12px;
}
.tool-card h3 { font-family: var(--font-display); font-size: 15px; margin: 0 0 4px; color: var(--text-0); }
.tool-card p { margin: 0; color: var(--text-2); font-size: 12.5px; line-height: 1.5; }

.recents h2 { font-family: var(--font-display); font-size: 14px; color: var(--text-1); margin: 0 0 10px; }
.recents ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.recents li a {
  display: flex; justify-content: space-between; gap: 10px;
  padding: 8px 12px; border-radius: var(--radius);
  background: var(--bg-1); border: 1px solid var(--border-soft);
  color: var(--text-1); font-size: 13px;
}
.recents li a:hover { color: var(--amber); border-color: var(--border); }
.recents li time { color: var(--text-3); font-family: var(--font-mono); font-size: 11.5px; }

/* ---------- shared controls ---------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.toolbar-wrap { row-gap: 10px; }
.spacer { flex: 1; }
.grow { flex: 1; min-width: 160px; }

.btn {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-0);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.05s;
}
.btn:hover { background: var(--bg-4); border-color: var(--text-3); }
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-primary { background: var(--amber); border-color: var(--amber); color: #241a08; font-weight: 600; }
.btn-primary:hover { background: #f0ac48; border-color: #f0ac48; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text-1); }
.btn-ghost:hover { color: var(--text-0); border-color: var(--text-3); }
.btn-danger { background: transparent; border-color: var(--rust-soft); color: var(--rust); }
.btn-danger:hover { background: var(--rust-soft); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.file-btn { display: inline-flex; align-items: center; cursor: pointer; }

input[type="text"], input[type="number"], input[type="url"], select, textarea {
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text-0);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 13px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color 0.12s;
}
input[type="text"]:focus, input[type="number"]:focus, input[type="url"]:focus, select:focus, textarea:focus { border-color: var(--amber); }
input::placeholder, textarea::placeholder { color: var(--text-3); }

select { cursor: pointer; }
.select-wrap { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-2); }
.select-wrap select, .select-wrap input[type=color] { padding: 6px 8px; }

input[type="color"] {
  width: 34px; height: 30px; padding: 2px; background: var(--bg-2);
  border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer;
}

.chk { display: flex; align-items: center; gap: 5px; font-size: 12.5px; color: var(--text-2); cursor: pointer; font-family: var(--font-mono); }
.chk input { accent-color: var(--amber); }

.dim-input { width: 78px; }

.status-pill {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--bg-3);
  color: var(--text-2);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.status-pill.ok { color: var(--verdigris); border-color: var(--verdigris-soft); background: var(--verdigris-soft); }
.status-pill.bad { color: var(--rust); border-color: var(--rust-soft); background: var(--rust-soft); }

.muted { color: var(--text-2); font-size: 12.5px; }

.tab-btn {
  background: none; border: 1px solid transparent; color: var(--text-2);
  padding: 6px 10px; border-radius: var(--radius); font-size: 12.5px; cursor: pointer;
}
.tab-btn:hover { color: var(--text-0); }
.tab-btn.active { background: var(--bg-3); color: var(--amber); border-color: var(--border); }

/* ---------- panes / split layout ---------- */

.split { display: grid; gap: 14px; }
.split-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .split-2 { grid-template-columns: 1fr; } }

.pane { display: flex; flex-direction: column; min-width: 0; }
.pane-head {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-2); font-family: var(--font-mono);
  padding: 0 2px 6px;
}
.pane-actions { display: flex; align-items: center; gap: 6px; text-transform: none; letter-spacing: normal; }

.code-area {
  width: 100%;
  min-height: 320px;
  background: var(--bg-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  color: var(--text-0);
  font-family: var(--font-mono);
  font-size: 12.8px;
  line-height: 1.6;
  padding: 14px;
  resize: vertical;
  white-space: pre;
  overflow: auto;
  margin: 0;
}
.code-area:focus { border-color: var(--amber); }
.code-area-sm { min-height: 120px; }
.code-area-lg { min-height: 420px; }

.error-line { color: var(--rust); font-family: var(--font-mono); font-size: 12.5px; margin: 10px 2px 0; min-height: 1em; }

.tree-view {
  min-height: 320px;
  background: var(--bg-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 12.8px;
  overflow: auto;
}
.tree-node { margin-left: 16px; }
.tree-row { display: flex; gap: 6px; align-items: baseline; }
.tree-key { color: var(--verdigris); }
.tree-toggle { cursor: pointer; color: var(--text-3); width: 12px; display: inline-block; user-select: none; }
.tree-type-string { color: var(--amber); }
.tree-type-number { color: #8fb2e8; }
.tree-type-boolean, .tree-type-null { color: var(--rust); }
.tree-punct { color: var(--text-3); }
.tree-count { color: var(--text-3); font-size: 11px; }

/* ---------- regex ---------- */

.regex-input-wrap {
  display: flex; align-items: center; background: var(--bg-2);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0 4px 0 10px; flex: 1; min-width: 220px;
}
.regex-input-wrap:focus-within { border-color: var(--amber); }
.regex-slash { color: var(--text-3); font-family: var(--font-mono); }
.regex-input-wrap input {
  background: none; border: none; padding: 8px 6px; font-family: var(--font-mono);
  color: var(--text-0); outline: none; flex: 1; min-width: 0;
}
.regex-flags-input { flex: 0 0 60px; }

.highlight-wrap { position: relative; }
.highlight-wrap textarea { position: relative; background: transparent; color: transparent; caret-color: var(--text-0); z-index: 2; }
.highlight-layer {
  position: absolute; inset: 0; padding: 14px; margin: 0;
  font-family: var(--font-mono); font-size: 12.8px; line-height: 1.6;
  white-space: pre-wrap; word-wrap: break-word; overflow: auto;
  background: var(--bg-1); border-radius: var(--radius-lg);
  color: var(--text-1); pointer-events: none; z-index: 1;
}
.highlight-layer mark { background: var(--amber-soft); color: var(--amber); border-radius: 2px; }
.highlight-layer mark.current { background: var(--verdigris-soft); color: var(--verdigris); }

.matches-list {
  min-height: 320px; max-height: 460px; overflow-y: auto;
  background: var(--bg-1); border: 1px solid var(--border-soft); border-radius: var(--radius-lg);
  padding: 10px; font-family: var(--font-mono); font-size: 12.3px;
}
.match-item { border-bottom: 1px solid var(--border-soft); padding: 8px 6px; }
.match-item:last-child { border-bottom: none; }
.match-item .m-head { color: var(--amber); margin-bottom: 4px; }
.match-item .m-full { color: var(--text-0); word-break: break-all; }
.match-item .m-group { color: var(--text-2); padding-left: 10px; word-break: break-all; }
.match-item .m-group b { color: var(--verdigris); font-weight: 500; }

.subpanel { margin-top: 22px; }
.replace-row { display: flex; gap: 8px; margin-bottom: 8px; }
.replace-row input { flex: 1; font-family: var(--font-mono); }

.cheatsheet { margin-top: 22px; border-top: 1px solid var(--border-soft); padding-top: 14px; }
.cheatsheet summary { cursor: pointer; color: var(--text-1); font-size: 13px; font-weight: 500; }
.cheat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 8px; margin-top: 12px; }
.cheat-item { background: var(--bg-1); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 8px 10px; font-size: 12px; }
.cheat-item code { color: var(--amber); font-family: var(--font-mono); }
.cheat-item span { color: var(--text-2); display: block; margin-top: 2px; }

/* ---------- API tester ---------- */

.api-request-row { display: flex; gap: 8px; margin-bottom: 14px; }
.api-request-row select { flex-shrink: 0; }
.api-request-row input { flex: 1; font-family: var(--font-mono); }

.api-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border-soft); margin-bottom: 12px; }
.api-tabpanel { margin-bottom: 18px; }

.header-row { display: flex; gap: 8px; margin-bottom: 8px; }
.header-row input { flex: 1; font-family: var(--font-mono); font-size: 12.5px; }
.header-row .btn { flex-shrink: 0; }

#api-history-list .hist-item {
  display: flex; gap: 10px; align-items: center; padding: 8px 10px;
  border: 1px solid var(--border-soft); border-radius: var(--radius); margin-bottom: 6px;
  cursor: pointer; font-size: 12.5px;
}
#api-history-list .hist-item:hover { border-color: var(--border); background: var(--bg-1); }
#api-history-list .hist-method { font-family: var(--font-mono); font-weight: 600; color: var(--amber); width: 48px; flex-shrink: 0; }
#api-history-list .hist-url { flex: 1; color: var(--text-1); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#api-history-list .hist-status { font-family: var(--font-mono); font-size: 11px; color: var(--text-3); }

.response-block { border-top: 1px solid var(--border-soft); padding-top: 16px; }
#api-response-body, #api-response-headers { min-height: 220px; max-height: 400px; }

/* ---------- snippet manager ---------- */

.snippet-layout { display: grid; grid-template-columns: 300px 1fr; gap: 18px; align-items: start; }
@media (max-width: 900px) { .snippet-layout { grid-template-columns: 1fr; } }

.snippet-list-pane { display: flex; flex-direction: column; gap: 10px; }
.snippet-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; max-height: 560px; overflow-y: auto; }
.snippet-list li {
  padding: 10px 12px; border: 1px solid var(--border-soft); border-radius: var(--radius);
  cursor: pointer; background: var(--bg-1);
}
.snippet-list li:hover { border-color: var(--border); }
.snippet-list li.active { border-color: var(--amber); background: var(--bg-2); }
.snippet-list li .sn-title { font-size: 13px; color: var(--text-0); font-weight: 500; margin-bottom: 3px; }
.snippet-list li .sn-meta { display: flex; gap: 6px; align-items: center; font-family: var(--font-mono); font-size: 10.5px; color: var(--text-3); }
.snippet-list li .sn-lang { background: var(--bg-3); border-radius: 3px; padding: 1px 5px; color: var(--verdigris); }
.snippet-list-empty { color: var(--text-3); font-size: 12.5px; padding: 12px; text-align: center; }

.snippet-editor-pane { display: flex; flex-direction: column; gap: 10px; }
#snippet-preview { overflow: auto; }
#snippet-preview code { font-family: var(--font-mono) !important; font-size: 12.8px; }

/* ---------- colour palette ---------- */

.palette-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  height: 420px;
}
@media (max-width: 760px) { .palette-strip { grid-template-columns: repeat(2, 1fr); height: auto; } }

.swatch {
  border-radius: var(--radius-lg);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 14px 12px;
  position: relative;
  min-height: 160px;
  border: 1px solid rgba(0,0,0,0.25);
  overflow: hidden;
}
.swatch .sw-top {
  position: absolute; top: 10px; left: 10px; right: 10px;
  display: flex; justify-content: space-between; align-items: center;
}
.swatch .sw-lock, .swatch .sw-copy-format {
  background: rgba(13,12,10,0.35); border: 1px solid rgba(255,255,255,0.15);
  border-radius: 5px; color: #fff; width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 13px;
  font-family: inherit; padding: 0; backdrop-filter: blur(2px);
}
.swatch .sw-lock.locked { background: rgba(13,12,10,0.65); border-color: rgba(255,255,255,0.4); }
.swatch .sw-values {
  background: rgba(13,12,10,0.4);
  border-radius: 6px; padding: 8px 10px; backdrop-filter: blur(2px);
}
.swatch .sw-hex, .swatch .sw-sub {
  display: block; width: 100%; text-align: left;
  background: none; border: none; padding: 0; color: inherit; font-family: var(--font-mono); cursor: pointer;
}
.swatch .sw-hex { font-weight: 600; font-size: 14px; }
.swatch .sw-sub { font-size: 10.5px; opacity: 0.85; margin-top: 2px; }
.swatch input[type=color] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; border: none; }

.export-menu { display: flex; gap: 6px; }

/* ---------- markdown ---------- */

.md-split .code-area, .md-preview { min-height: 480px; }
.md-preview {
  background: var(--bg-1); border: 1px solid var(--border-soft); border-radius: var(--radius-lg);
  padding: 18px 20px; overflow: auto; font-size: 13.5px; line-height: 1.65;
}
.md-preview h1, .md-preview h2, .md-preview h3 { font-family: var(--font-display); color: var(--text-0); margin-top: 1.2em; }
.md-preview h1:first-child, .md-preview h2:first-child { margin-top: 0; }
.md-preview a { color: var(--verdigris); text-decoration: underline; }
.md-preview code { font-family: var(--font-mono); background: var(--bg-3); padding: 1px 5px; border-radius: 3px; font-size: 0.9em; }
.md-preview pre { background: var(--bg-2); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 12px 14px; overflow: auto; }
.md-preview pre code { background: none; padding: 0; }
.md-preview blockquote { border-left: 3px solid var(--amber); margin: 0; padding-left: 14px; color: var(--text-1); }
.md-preview table { border-collapse: collapse; width: 100%; }
.md-preview th, .md-preview td { border: 1px solid var(--border-soft); padding: 6px 10px; }
.md-preview img { max-width: 100%; border-radius: 6px; }
.md-preview ul, .md-preview ol { padding-left: 1.4em; }
.md-preview hr { border: none; border-top: 1px solid var(--border-soft); }

/* ---------- image converter ---------- */

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 20px;
  text-align: center;
  color: var(--text-1);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--amber); background: var(--bg-1); }
.drop-zone p { margin: 4px 0; }

.image-workspace { display: flex; flex-direction: column; gap: 16px; }
.image-preview-box {
  min-height: 260px; background: var(--bg-1); border: 1px solid var(--border-soft); border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
  background-image: linear-gradient(45deg, var(--checker) 25%, transparent 25%), linear-gradient(-45deg, var(--checker) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--checker) 75%), linear-gradient(-45deg, transparent 75%, var(--checker) 75%);
  background-size: 16px 16px; background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}
.image-preview-box img { max-width: 100%; max-height: 260px; object-fit: contain; }

/* ---------- toast ---------- */

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--bg-3); border: 1px solid var(--border); color: var(--text-0);
  padding: 10px 18px; border-radius: var(--radius); font-size: 13px;
  z-index: 100; box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  animation: toastin 0.2s ease;
}
@keyframes toastin { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  .shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--border-soft); }
  #nav-list { flex-direction: row; overflow-x: auto; padding: 10px; }
  #nav-list a { flex-shrink: 0; border-left: none; border-bottom: 2px solid transparent; }
  #nav-list a.active { border-left-color: transparent; border-bottom-color: var(--amber); }
  .sidebar-foot { display: none; }
  .main { padding: 18px 16px 50px; }
  .hero h1 { font-size: 24px; }
  .topbar { gap: 10px; padding: 0 12px; }
  .brand-word { display: none; }
  .topbar-link { display: none; }
}