/* toolwebsites - single stylesheet. Mobile-first. */

:root {
  --bg:        #eef1f5;
  --fg:        #16191d;
  --muted:     #5c6570;
  --line:      #c8ced8;
  --line-2:    #dde2ea;
  --panel:     #f8f9fc;
  --hover:     #e4e9f1;
  --accent:    #3d6d9e;
  --accent-fg: #f4f7fb;
  --accent-soft: rgba(61,109,158,.14);
  --input-bg:  #ffffff;
  --input-border: #b4bcc8;
  --btn-metal-1: #e8ecf2;
  --btn-metal-2: #cfd6e0;
  --btn-metal-3: #aeb8c6;
  --btn-metal-b: #8a96a8;
  --btn-metal-text: #1a2433;
  --btn-primary-1: #5a8bc4;
  --btn-primary-2: #3d6d9e;
  --btn-primary-3: #2f5680;
  --danger:    #b04848;
  --shadow-1:  0 1px 2px rgba(15,17,21,.04), 0 1px 0 rgba(15,17,21,.03);
  --shadow-2:  0 8px 24px rgba(15,17,21,.10);
  --mono:      ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --r:         8px;
  --r-sm:      6px;
  --bar-h:     46px;
  --side-w:    272px;
  /* Tool forms: consistent vertical rhythm */
  --tool-stack-gap: .85rem;
  --tool-section-gap: .95rem;
  --tool-label-input-gap: .38rem;
  --tool-row-gap: .6rem;
  --tool-row-gap-x: .8rem;
  --surface-grad-1: rgba(255,255,255,.76);
  --surface-grad-2: rgba(248,249,252,.96);
}
:root.theme-dark, :root.theme-auto:where([data-pcs="dark"]) {
  --bg:    #0c0f14;
  --fg:    #e8eaed;
  --muted: #8b94a3;
  --line:  #2a3140;
  --line-2:#1e242e;
  --panel: #141920;
  --hover: #1c2330;
  --accent: #6b9fd4;
  --accent-fg: #0c1219;
  --accent-soft: rgba(107,159,212,.18);
  --input-bg: #1a202c;
  --input-border: #3a4558;
  --btn-metal-1: #2c3545;
  --btn-metal-2: #232b38;
  --btn-metal-3: #1a212c;
  --btn-metal-b: #4a566b;
  --btn-metal-text: #e8edf4;
  --btn-primary-1: #5a8bc4;
  --btn-primary-2: #3d6d9e;
  --btn-primary-3: #2a4d73;
  --danger:#e07a7a;
  --shadow-1: 0 1px 2px rgba(0,0,0,.4);
  --shadow-2: 0 12px 32px rgba(0,0,0,.55);
  --surface-grad-1: rgba(30,37,49,.72);
  --surface-grad-2: rgba(20,25,32,.96);
}
@media (prefers-color-scheme: dark) {
  :root.theme-auto {
    --bg:    #0c0f14;
    --fg:    #e8eaed;
    --muted: #8b94a3;
    --line:  #2a3140;
    --line-2:#1e242e;
    --panel: #141920;
    --hover: #1c2330;
    --accent: #6b9fd4;
    --accent-fg: #0c1219;
    --accent-soft: rgba(107,159,212,.18);
    --input-bg: #1a202c;
    --input-border: #3a4558;
    --btn-metal-1: #2c3545;
    --btn-metal-2: #232b38;
    --btn-metal-3: #1a212c;
    --btn-metal-b: #4a566b;
    --btn-metal-text: #e8edf4;
    --btn-primary-1: #5a8bc4;
    --btn-primary-2: #3d6d9e;
    --btn-primary-3: #2a4d73;
    --danger:#e07a7a;
    --shadow-1: 0 1px 2px rgba(0,0,0,.4);
    --shadow-2: 0 12px 32px rgba(0,0,0,.55);
    --surface-grad-1: rgba(30,37,49,.72);
    --surface-grad-2: rgba(20,25,32,.96);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg); color: var(--fg);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;

  /* App shell: topbar (row 1, full width) + sidebar (row 2 col 1) + main (row 2 col 2) */
  display: grid;
  grid-template-columns: 0 1fr;
  grid-template-rows: var(--bar-h) 1fr;
  min-height: 100dvh;
  overflow: hidden;
  transition: grid-template-columns .22s ease;
}
body.sidebar-open { grid-template-columns: var(--side-w) 1fr; }

/* --- top bar ---------------------------------------------------- */
#topbar {
  grid-column: 1 / -1; grid-row: 1;
  display: flex; align-items: center;
  height: var(--bar-h);
  padding: 0 .4rem;
  background: var(--panel); border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-1);
  z-index: 5;
}
.bar-left  { flex: 0 0 auto; display: flex; align-items: center; gap: .25rem; }
.bar-right { flex: 0 0 auto; display: flex; align-items: center; gap: .25rem; }
.bar-mid {
  flex: 1 1 auto; min-width: 0;
  padding: 0 .6rem;
  display: flex; align-items: center; gap: .5rem;
  overflow: hidden;
}

.bar-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  height: 32px; padding: 0 .6rem;
  border: 1px solid transparent; border-radius: var(--r-sm);
  background: transparent; color: var(--fg);
  cursor: pointer; font: inherit;
  transition: background .12s, border-color .12s, color .12s;
}
.bar-btn:hover { background: var(--hover); }
.bar-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.bar-btn[aria-expanded="true"] { background: var(--hover); border-color: var(--line); }
.bar-btn.icon-only { padding: 0; width: 32px; justify-content: center; }
.bar-btn-label { font-size: .88rem; font-weight: 600; letter-spacing: -.01em; }
.bar-btn--sidebar { padding: 0 .45rem 0 .35rem; max-width: min(11rem, 42vw); }
@media (max-width: 520px) {
  #btn-sidebar .bar-btn-label { display: none; }
  #btn-sidebar { width: 32px; padding: 0; justify-content: center; max-width: none; }
}

/* (page-title topbar slot replaced by #tabbar; see further below.) */

/* --- sidebar (drawer) ------------------------------------------- */
#sidebar {
  grid-column: 1; grid-row: 2;
  background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column;
  overflow: hidden;
  min-width: 0;
}
#sidebar > * { width: var(--side-w); flex: 0 0 auto; }
#sidebar > .sidebar-nav { flex: 1 1 auto; overflow-y: auto; min-height: 0; }

.sidebar-filter-wrap {
  padding: .4rem .5rem .45rem;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}
.sidebar-filter-row {
  display: flex; align-items: center; gap: .35rem;
  min-width: 0;
}
.sidebar-filter-row .sidebar-filter {
  flex: 1 1 auto;
  min-width: 0;
}
.sidebar-close.bar-btn {
  flex: 0 0 auto;
  width: 30px; height: 30px; padding: 0;
  justify-content: center;
  border-color: var(--line);
}
.sidebar-close:hover { background: var(--hover); }
.sidebar-filter {
  width: 100%; box-sizing: border-box;
  padding: .38rem .55rem;
  font: inherit; font-size: .88rem;
  border: 1px solid var(--line); border-radius: var(--r-sm);
  background: var(--bg); color: var(--fg);
}
.sidebar-filter:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.sidebar-filter-empty { padding: .75rem .85rem; font-size: .86rem; }
.sidebar-filter-list a { padding-left: .85rem; }

.sidebar-nav { padding: 0; }

/* outer main (Tools, Math, …): summary flush with sidebar edge */
.tree-main { border-bottom: 1px solid var(--line-2); }
.tree-main > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: .4rem;
  padding: .48rem .5rem .48rem .35rem;
  font-size: .9rem; font-weight: 700; color: var(--fg);
  user-select: none;
}
.tree-main > summary::-webkit-details-marker { display: none; }
.tree-main > summary:hover { background: var(--hover); }
.tree-main > summary .chev {
  display: inline-block; width: .65rem; margin-left: 0;
  transition: transform .15s ease;
  color: var(--muted); flex: 0 0 auto;
}
.tree-main[open] > summary .chev { transform: rotate(90deg); }
.tree-main > summary .main-icon {
  display: inline-grid; place-items: center;
  width: 1.68rem; height: 1.68rem; border-radius: 7px;
  font-family: var(--mono); font-weight: 700; font-size: .95rem; line-height: 1;
  flex: 0 0 auto;
  background: hsl(var(--main-icon-h, 208) 56% 42%);
  color: #f8fafc;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.28), 0 1px 2px rgba(15,24,40,.12);
}
:root.theme-dark .tree-main > summary .main-icon,
:root.theme-auto:where([data-pcs="dark"]) .tree-main > summary .main-icon {
  background: hsl(var(--main-icon-h, 208) 48% 54%);
  color: #0b0e12;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.18), 0 1px 2px rgba(0,0,0,.2);
}
@media (prefers-color-scheme: dark) {
  :root.theme-auto .tree-main > summary .main-icon {
    background: hsl(var(--main-icon-h, 208) 48% 54%);
    color: #0b0e12;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.18), 0 1px 2px rgba(0,0,0,.2);
  }
}
.tree-main > summary .tree-main-name { flex: 1 1 auto; min-width: 0; }
.tree-main-inner { padding: 0 0 .1rem; }
.tree-main-inner .cat { border-bottom: none; }
.tree-main-inner .cat > summary { padding-left: 1.35rem; font-weight: 600; }
.tree-main-inner .cat-list a { padding-left: 3.15rem; }

/* category disclosure */
.cat { border-bottom: 1px solid var(--line-2); }
.cat > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: .5rem;
  padding: .5rem .85rem;
  font-size: .9rem; font-weight: 600; color: var(--fg);
  user-select: none;
}
.cat > summary::-webkit-details-marker { display: none; }
.cat > summary:hover { background: var(--hover); }
.cat > summary .chev {
  display: inline-block; width: .7rem; transition: transform .15s ease;
  color: var(--muted); flex: 0 0 auto;
}
.cat[open] > summary .chev { transform: rotate(90deg); }
.cat > summary .cat-icon {
  display: inline-grid; place-items: center;
  width: 1.2rem; height: 1.2rem; border-radius: 4px;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--mono); font-weight: 700; font-size: .72rem;
  flex: 0 0 auto;
}
.cat > summary .cat-name { flex: 1 1 auto; min-width: 0; }
.cat > summary .cat-count { font-size: .72rem; color: var(--muted); font-weight: 500; }

.cat-list { list-style: none; margin: 0; padding: .1rem 0 .35rem; }
.cat-list a {
  display: flex; align-items: center; gap: .55rem;
  padding: .4rem .85rem .4rem 2.85rem;
  color: var(--fg); text-decoration: none; font-size: .9rem;
  border-left: 2px solid transparent;
}
.cat-list a:hover { background: var(--hover); }
.cat-list a.active {
  background: var(--accent-soft); color: var(--accent);
  border-left-color: var(--accent); font-weight: 600;
}
.cat-list .tool-icon {
  font-family: var(--mono); font-weight: 700; opacity: .65;
  width: 1rem; text-align: center; flex: 0 0 auto;
}

/* --- mobile: sidebar overlays instead of pushing --------------- */
#sidebar-backdrop { display: none; }
@media (max-width: 719px) {
  body, body.sidebar-open { grid-template-columns: 0 1fr; }
  #sidebar {
    position: fixed; top: var(--bar-h); bottom: 0; left: 0;
    width: var(--side-w); max-width: 86vw;
    transform: translateX(-100%); transition: transform .22s ease;
    box-shadow: var(--shadow-2); z-index: 30;
    grid-column: auto; grid-row: auto;
    border-right: 1px solid var(--line);
  }
  body.sidebar-open #sidebar { transform: translateX(0); }
  #sidebar > * { width: 100%; }
  #sidebar-backdrop {
    display: block; position: fixed; inset: var(--bar-h) 0 0 0;
    background: rgba(0,0,0,.32); opacity: 0; pointer-events: none;
    transition: opacity .18s ease; z-index: 25;
  }
  body.sidebar-open #sidebar-backdrop { opacity: 1; pointer-events: auto; }
}

/* --- burger menu ------------------------------------------------ */
#menu {
  position: fixed; top: calc(var(--bar-h) + 4px); right: .4rem; z-index: 40;
  min-width: 200px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  box-shadow: var(--shadow-2);
  padding: .25rem;
}
#menu ul { list-style: none; margin: 0; padding: 0; }
#menu li > * {
  display: flex; align-items: center; gap: .55rem;
  width: 100%; padding: .5rem .65rem;
  background: transparent; border: 0; color: var(--fg); font: inherit;
  text-align: left; cursor: pointer; text-decoration: none;
  border-radius: var(--r-sm);
}
#menu li > *:hover { background: var(--hover); }
#menu li > [disabled] { color: var(--muted); cursor: not-allowed; }
#menu li > [disabled]:hover { background: transparent; }
#menu .sep { height: 1px; background: var(--line); margin: .25rem 0; }
#menu .menu-icon { display: inline-grid; place-items: center; width: 18px; height: 18px; color: var(--muted); flex: 0 0 auto; }
#menu .menu-key { margin-left: auto; color: var(--muted); font-size: .78rem; }

/* --- planets table: relative size strip ------------------------- */
.planet-size-strip { margin-top: 1.25rem; padding: 1rem; border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); }
.planet-size-strip-note { font-size: .85rem; margin: 0 0 .75rem; }
.planet-size-row {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: center;
  gap: .75rem 1rem;
}
.planet-size-cell { display: flex; flex-direction: column; align-items: center; gap: .35rem; }
.planet-disc {
  border-radius: 50%; flex-shrink: 0;
  box-shadow: inset -3px -4px 10px rgba(0,0,0,.22), 0 1px 2px rgba(0,0,0,.08);
}
.planet-size-name { font-size: .78rem; color: var(--muted); text-align: center; max-width: 6rem; line-height: 1.2; }
.planet-disc--mercury { background: linear-gradient(145deg, #c4c4c4, #7a7a7a); }
.planet-disc--venus { background: linear-gradient(145deg, #e8d4a8, #c9a227); }
.planet-disc--earth { background: linear-gradient(145deg, #3a7ab8, #1e5a3a 55%, #2d6b4a); }
.planet-disc--mars { background: linear-gradient(145deg, #c65c3a, #8b2e1a); }
.planet-disc--jupiter { background: linear-gradient(160deg, #c9a574 15%, #a67c52 40%, #d4c4a8 70%, #8b7355); }
.planet-disc--saturn { background: linear-gradient(145deg, #e8d9b8, #b89860); }
.planet-disc--uranus { background: linear-gradient(145deg, #b8e8ea, #6ab8c9); }
.planet-disc--neptune { background: linear-gradient(145deg, #5b8fd8, #2a4a9e); }

/* --- main / app ------------------------------------------------- */
#app {
  grid-column: 2; grid-row: 2;
  min-width: 0;
  overflow-y: auto;
  padding: .75rem 1rem calc(1.25rem + env(safe-area-inset-bottom, 0px));
  padding-left: max(1rem, env(safe-area-inset-left, 0px));
  padding-right: max(1rem, env(safe-area-inset-right, 0px));
}
@media (max-width: 480px) {
  #app {
    padding: .5rem max(.75rem, env(safe-area-inset-left, 0px)) calc(1rem + env(safe-area-inset-bottom, 0px))
      max(.75rem, env(safe-area-inset-right, 0px));
  }
}

/* Cap the tool content width on very wide displays (left-aligned under #app). */
#page {
  width: 100%;
  max-width: 72rem;
  text-align: left;
}
.tool-view {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: var(--tool-section-gap);
  align-items: stretch;
  min-width: 0;
  color: var(--fg);
}
.tool-view img:not([width]):not([style*="width"]),
.tool-view video {
  max-width: 100%;
  height: auto;
}

/* Single root wrapper: stack sections inside the wrapper */
.tool-view > *:only-child {
  display: flex;
  flex-direction: column;
  gap: var(--tool-stack-gap);
  min-width: 0;
}
.tool-view > *:only-child > .tool-h3 {
  margin: .2rem 0 0;
}

/* Keep individual single-line form controls from sprawling across a
   wide field. Tools that need wider inputs use `class="mono"` (long
   hex / binary strings) or set an inline width. Textareas, tables,
   canvases and chart hosts are intentionally left unbounded so they
   can use the full content width when needed. */
input[type="text"],
input[type="search"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="tel"] {
  max-width: min(36rem, 100%);
}
input.mono { max-width: min(48rem, 100%); }
select {
  max-width: min(28rem, 100%);
  width: max-content;
}

.ad-slot { display: block; }
.ad-slot[hidden] { display: none; }

/* --- home (welcome) -------------------------------------------- */
.home h1 { margin: .15rem 0 .3rem; font-size: 1.4rem; letter-spacing: -.01em; }
.home .lede { color: var(--muted); margin: 0 0 1rem; max-width: 38rem; }
.home-cta {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem .85rem; border-radius: var(--r-sm);
  background: var(--accent); color: var(--accent-fg);
  border: 0; font-weight: 600; cursor: pointer;
}
.home-cta:hover { filter: brightness(1.05); }
.home-section-head {
  margin: 1.25rem 0 .5rem;
  font-size: .78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em; color: var(--muted);
}
.home-cats { display: grid; gap: .55rem; grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr)); }
.home-cat {
  display: flex; flex-direction: column; gap: .2rem;
  padding: .8rem .9rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  text-decoration: none; color: inherit; cursor: pointer;
  transition: border-color .12s, transform .12s;
}
.home-cat:hover { border-color: var(--accent); transform: translateY(-1px); }
.home-cat .hc-name { font-weight: 600; display: flex; align-items: center; gap: .5rem; }
.home-cat .hc-name .cat-icon {
  display: inline-grid; place-items: center;
  width: 1.2rem; height: 1.2rem; border-radius: 4px;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--mono); font-weight: 700; font-size: .72rem;
}
.home-cat .hc-count { color: var(--muted); font-size: .82rem; }

/* --- generic form bits used by tools ---------------------------- */
.row {
  display: flex; flex-wrap: wrap;
  gap: var(--tool-row-gap) var(--tool-row-gap-x);
  align-items: flex-end;
  margin: 0;
}
.row > label { display: inline-flex; align-items: center; gap: .4rem; font-size: .9rem; color: var(--fg); }
.field {
  display: flex; flex-direction: column;
  gap: var(--tool-label-input-gap);
  min-width: 0;
  flex: 0 1 auto;
  align-items: flex-start;
  max-width: min(32rem, 100%);
}
.field > label { font-size: .76rem; color: var(--muted); }
/* Full-width primary input column (one big text / number field per row) */
.field--block {
  flex: 1 1 100%;
  align-items: stretch;
  max-width: min(40rem, 100%);
}
.field--block > input[type="text"],
.field--block > input[type="search"],
.field--block > input[type="number"],
.field--block > input[type="email"],
.field--block > input[type="url"],
.field--block > input[type="tel"],
.field--block > textarea,
.field--block > select {
  width: 100%;
  max-width: none;
}
/* Horizontal toolbars: compact selects and short inputs (no stretching) */
.row.row--tools-inline .field {
  flex: 0 0 auto;
  max-width: none;
}
.row.row--tools-inline .field > select {
  width: max-content;
  max-width: min(22rem, 100%);
}
.row.row--tools-inline .field > input[type="text"],
.row.row--tools-inline .field > input[type="search"],
.row.row--tools-inline .field > input[type="number"] {
  width: auto;
  min-width: 4.5rem;
  max-width: 14rem;
}
/* Read-only output rows: one mono field uses full row width */
.row.row--output .field--block {
  max-width: min(48rem, 100%);
}
/* Tight groups: range fields, small numeric triplets */
.tool-field-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--tool-row-gap) var(--tool-row-gap-x);
  align-items: flex-end;
  margin: 0;
}
.tool-field-row .field {
  flex: 0 0 auto;
  max-width: none;
}
.tool-field-row .field > input[type="text"],
.tool-field-row .field > input[type="search"],
.tool-field-row .field > input[type="number"] {
  min-width: 3.5rem;
  max-width: 9rem;
}
.tool-field-row .field--wide > input[type="text"],
.tool-field-row .field--wide > input[type="search"],
.tool-field-row .field--wide > input[type="number"] {
  max-width: 11rem;
}
.tool-field-row > .primary,
.tool-field-row > button.primary {
  flex: 0 0 auto;
  align-self: flex-end;
}

.numconv .err { min-height: 1.25rem; font-size: .86rem; }

input, select, textarea {
  font: inherit; color: inherit;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--r-sm);
  padding: .5rem .65rem;
  min-width: 0;
  box-shadow: inset 0 1px 1px rgba(255,255,255,.35);
  transition: border-color .14s ease, box-shadow .14s ease, background .14s ease;
}
:root.theme-dark input, :root.theme-dark select, :root.theme-dark textarea,
:root.theme-auto:where([data-pcs="dark"]) input,
:root.theme-auto:where([data-pcs="dark"]) select,
:root.theme-auto:where([data-pcs="dark"]) textarea {
  box-shadow: inset 0 1px 2px rgba(0,0,0,.25);
}
input[type="text"], input[type="search"], textarea { width: 100%; }
/* Undo full width for compact inline rows (must follow the rule above). */
.row.row--tools-inline .field > input[type="text"],
.row.row--tools-inline .field > input[type="search"],
.row.row--tools-inline .field > input[type="number"],
.tool-field-row .field > input[type="text"],
.tool-field-row .field > input[type="search"],
.tool-field-row .field > input[type="number"] {
  width: auto;
}
input:focus, select:focus, textarea:focus, button:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), inset 0 1px 1px rgba(255,255,255,.25);
}
button {
  cursor: pointer;
  font: inherit;
  color: var(--btn-metal-text);
  border: 1px solid var(--btn-metal-b);
  border-radius: var(--r-sm);
  padding: .42rem .85rem;
  background: linear-gradient(180deg, var(--btn-metal-1) 0%, var(--btn-metal-2) 45%, var(--btn-metal-3) 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.25), 0 1px 1px rgba(15,24,40,.08);
  transition: filter .14s ease, border-color .14s ease, transform .08s ease;
}
:root.theme-dark button, :root.theme-auto:where([data-pcs="dark"]) button {
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 1px 2px rgba(0,0,0,.35);
}
button:hover {
  filter: brightness(1.04);
  border-color: var(--accent);
}
button:active { filter: brightness(0.97); transform: translateY(1px); }
button.primary {
  color: var(--accent-fg);
  border-color: #2a4d73;
  background: linear-gradient(180deg, var(--btn-primary-1) 0%, var(--btn-primary-2) 40%, var(--btn-primary-3) 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.22), 0 1px 2px rgba(15,24,40,.12);
}
:root.theme-dark button.primary, :root.theme-auto:where([data-pcs="dark"]) button.primary {
  border-color: #7aa8d9;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.12), 0 1px 2px rgba(0,0,0,.4);
}
button.btn-metal { }
button.danger  { background: transparent; color: var(--danger); border-color: var(--line); box-shadow: none; }
button.danger:hover { background: var(--accent-soft); }
.bar-btn, .bar-btn.icon-only {
  background: transparent; border-color: transparent; color: var(--fg);
  box-shadow: none; padding: 0 .6rem;
}
.bar-btn:hover { background: var(--hover); filter: none; }

.muted { color: var(--muted); }
.mono  { font-family: var(--mono); }
.err   { color: var(--danger); font-size: .85rem; min-height: 1em; }

/* tables used by tools */
table.t { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: .9rem; }
table.t th, table.t td { padding: .35rem .5rem; border-bottom: 1px solid var(--line-2); text-align: left; }
table.t th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--panel); }
table.t tr:hover td { background: var(--hover); }

.scroll-y { max-height: calc(100dvh - var(--bar-h) - 11rem); overflow-y: auto; border: 1px solid var(--line); border-radius: var(--r-sm); }

/* settings */
.settings-group { margin: 0 0 1rem; }

/* legal (imprint, privacy) */
.legal-page {
  max-width: 42rem;
  padding: 0 0 1.5rem;
}
.legal-page h1 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.legal-body {
  line-height: 1.55;
  color: var(--fg);
  font-size: 0.95rem;
}
.legal-body p {
  margin: 0 0 0.75rem;
}
.legal-body p:last-child {
  margin-bottom: 0;
}
.legal-body--html h4 {
  margin: 1.35rem 0 0.45rem;
  font-size: 1rem;
  font-weight: 650;
  color: var(--fg);
}
.legal-body--html h4:first-of-type {
  margin-top: 0.35rem;
}
.legal-lang-switch {
  margin-bottom: 1rem;
}
.legal-lang-switch a {
  color: var(--accent);
  font-weight: 600;
}
.settings-group h2 {
  font-size: .78rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .06em; color: var(--muted); margin: 0 0 .4rem;
}
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: var(--r-sm); overflow: hidden; }
.seg button {
  border: 0; border-radius: 0; background: transparent; padding: .35rem .8rem;
  box-shadow: none; filter: none;
}
.seg button:hover { filter: none; background: var(--hover); border-color: transparent; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on {
  background: linear-gradient(180deg, var(--btn-primary-1) 0%, var(--btn-primary-2) 50%, var(--btn-primary-3) 100%);
  color: var(--accent-fg);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.15);
}

/* --- stub placeholder card ------------------------------------- */
.stub {
  display: flex; flex-direction: column; gap: .6rem;
  max-width: 40rem;
  padding: 1rem 1.1rem;
  background: var(--panel); border: 1px dashed var(--line); border-radius: var(--r);
}
.stub-badge {
  display: inline-block; width: fit-content;
  padding: .15rem .55rem; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  font-size: .7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em;
}
.stub-desc { margin: 0; font-size: 1rem; color: var(--fg); }
.stub-note { margin: 0; font-size: .88rem; }

/* --- clock / alarm tools --------------------------------------- */
.clock-big {
  font-family: var(--mono); font-size: 2.4rem;
  font-variant-numeric: tabular-nums; letter-spacing: .01em;
  margin: .6rem 0;
}
.clock-controls { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .25rem; }
.clock-zones    { display: grid; gap: .5rem; grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); margin-top: .5rem; }
.clock-zone {
  padding: .55rem .7rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
}
.clock-zone .z-name {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .82rem; color: var(--muted);
}
.clock-zone .z-time {
  font-family: var(--mono); font-size: 1.15rem;
  font-variant-numeric: tabular-nums; margin-top: .15rem;
}
.clock-zone .z-date { font-size: .78rem; margin-top: .05rem; }
.clock-zone .z-remove {
  background: transparent; border: 0; color: var(--muted);
  cursor: pointer; padding: 0 .25rem; line-height: 1;
  font-size: 1.05rem;
}
.clock-zone .z-remove:hover { color: var(--danger); }
.laps { margin: .5rem 0 0; padding: 0 0 0 1.4rem; }
.laps li { padding: .1rem 0; }

/* --- unit converter table -------------------------------------- */
.uc-table {
  width: 100%; max-width: 32rem;
  border-collapse: collapse; margin-top: .75rem;
  font-size: .92rem;
}
.uc-table th, .uc-table td {
  padding: .3rem .55rem;
  border-bottom: 1px solid var(--line-2);
  text-align: left;
}
.uc-table th { color: var(--muted); font-weight: 600; }
.uc-table tr.uc-self td { background: var(--accent-soft); font-weight: 600; }
.uc-table tr:hover td { background: var(--hover); }
.uc-table tr.uc-self:hover td { background: var(--accent-soft); }

/* --- generic tool helpers -------------------------------------- */
.tool-h3       { margin: 1.25rem 0 .45rem; font-size: .92rem; color: var(--muted); }
.tool-view > .tool-h3:first-child { margin-top: 0; }
.flag-cb       { display: inline-flex; align-items: center; gap: .25rem; font-size: .92rem; }
.kv-table      { width: 100%; max-width: 36rem; border-collapse: collapse; margin: .5rem 0; }
.kv-table td, .kv-table th { padding: .28rem .55rem; border-bottom: 1px solid var(--line-2); text-align: left; vertical-align: top; }
.kv-table td.k { color: var(--muted); width: 12rem; }
.kv-table td.v { font-family: var(--mono); }
.tool-card {
  background: linear-gradient(180deg, var(--surface-grad-1), var(--surface-grad-2));
  border: 1px solid var(--line);
  border-radius: calc(var(--r) + 2px);
  box-shadow: var(--shadow-1);
  padding: .9rem 1rem;
  min-width: 0;
}
.tool-card > :first-child { margin-top: 0; }
.tool-card > :last-child { margin-bottom: 0; }
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: .75rem;
}
.tool-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.metric-card {
  display: flex;
  flex-direction: column;
  gap: .18rem;
  padding: .75rem .85rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  background: var(--panel);
  min-width: 0;
}
.metric-card .metric-k { color: var(--muted); font-size: .78rem; font-weight: 600; }
.metric-card .metric-v { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 1.05rem; }
.math { line-height: 1.3; }
.math-display { margin: .25rem 0; overflow-x: auto; }

/* --- drop zone ------------------------------------------------- */
.drop-zone {
  display: flex; align-items: center; justify-content: center;
  padding: .9rem 1rem; margin: .5rem 0;
  border: 1px dashed var(--line); border-radius: var(--r);
  background: var(--panel); cursor: pointer; user-select: none;
  font-size: .9rem; color: var(--muted);
}
.drop-zone.dragging { border-color: var(--accent); color: var(--accent); }
.drop-zone:focus    { outline: 2px solid var(--accent); outline-offset: 2px; }

/* --- range table (number system) ------------------------------- */
.range-host { margin-top: .5rem; max-height: 24rem; overflow: auto; }

/* --- regex tester --------------------------------------------- */
.rx-hl { background: var(--panel); padding: .5rem .6rem; border-radius: var(--r); border: 1px solid var(--line-2); white-space: pre-wrap; }
.rx-hl mark { background: var(--accent-soft); color: var(--fg); padding: 0 .1rem; border-radius: .15rem; }
.rx-matches  { padding-left: 1.3rem; }
.rx-matches li { padding: .15rem 0; font-size: .88rem; }

/* --- diff ------------------------------------------------------ */
.diff-out { background: var(--panel); padding: .5rem .6rem; border-radius: var(--r); border: 1px solid var(--line-2); max-height: 26rem; overflow: auto; }
.d-line   { padding: 0 .25rem; white-space: pre-wrap; }
.d-eq     { color: var(--muted); }
.d-add    { background: rgba(46,160,67,.18); }
.d-rem    { background: rgba(220,53,69,.18); }

/* --- bit inspector --------------------------------------------- */
.bit-grid { display: flex; flex-wrap: wrap; gap: .15rem; align-items: center; margin: .5rem 0; }
.bit-cell {
  font-family: var(--mono); font-size: .82rem;
  width: 1.6rem; height: 1.8rem;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); background: var(--panel); color: var(--muted);
  cursor: pointer; padding: 0;
}
.bit-cell.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.bit-gap { width: .5rem; }

/* --- markdown preview ------------------------------------------ */
.md-split  { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
@media (max-width: 800px) { .md-split { grid-template-columns: 1fr; } }
.md-preview {
  background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r);
  padding: .75rem 1rem; min-height: 12rem; overflow: auto; max-height: 30rem;
}
.md-preview h1, .md-preview h2, .md-preview h3 { margin: .6rem 0 .3rem; }
.md-preview pre { background: var(--bg); padding: .5rem .7rem; border-radius: .25rem; overflow: auto; }
.md-preview code { font-family: var(--mono); font-size: .9em; }
.md-preview blockquote { border-left: 3px solid var(--line); margin: .25rem 0; padding-left: .65rem; color: var(--muted); }

/* --- CSV / pivot tables ---------------------------------------- */
.csv-table-host { overflow: auto; max-height: 30rem; margin-top: .5rem; }
.csv-table       { border-collapse: collapse; font-size: .9rem; }
.csv-table th, .csv-table td { padding: .25rem .5rem; border-bottom: 1px solid var(--line-2); text-align: left; }
.csv-table th    { background: var(--panel); position: sticky; top: 0; cursor: pointer; user-select: none; }

/* --- charts ---------------------------------------------------- */
.chart-host { margin-top: .75rem; }

/* --- image tools ----------------------------------------------- */
.img-preview { max-width: 100%; max-height: 16rem; margin: .5rem 0; display: block; border: 1px solid var(--line-2); border-radius: var(--r); }
.img-grid    { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: .75rem; margin-top: .5rem; }
.img-cell    { background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r); padding: .35rem; }
.img-cell canvas { width: 100%; height: auto; display: block; }
.img-label   { font-size: .8rem; color: var(--muted); padding: 0 .15rem .25rem; }
.hist-grid   { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: .5rem; margin-top: .5rem; }
.hist-panel  { background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r); padding: .35rem; }
.pix-info    { padding: .25rem 0; font-size: .9rem; }

/* --- QR -------------------------------------------------------- */
.qr-out svg  { display: block; margin: .5rem auto; max-width: 100%; height: auto; }

/* --- finance --------------------------------------------------- */
.fin-panel { margin-bottom: .9rem; padding: .6rem .8rem; background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r); }
.tool-view > .fin-in,
.tool-view .fin-in:first-child {
  display: block;
  margin-bottom: 0.15rem;
}
.tool-view .fin-out {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 0.15rem;
}
.tool-view .fin-out > .kv-row:first-child { border-top: 1px solid var(--line-2); }

.tool-view p.muted { margin: 0.2rem 0; line-height: 1.45; }
.tool-view p.muted.small { margin-top: 0.35rem; }

/* --- Pomodoro session timer ----------------------------------- */
.pomo-phase { font-size: .92rem; font-weight: 600; color: var(--fg); }
.pomo-clock {
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: .04em;
  margin: .2rem 0 .4rem;
  font-variant-numeric: tabular-nums;
}
.pomo-bar {
  height: .5rem;
  background: var(--line-2);
  border-radius: 99px;
  overflow: hidden;
  max-width: 22rem;
  width: 100%;
}
.pomo-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.2s linear;
}

/* --- letter / word frequency tool ----------------------------- */
.freq-chart {
  display: block;
  width: 100%;
  max-width: 42rem;
  margin: 0.35rem 0 0.65rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  background: var(--panel);
}

/* --- input/output swap (ciphers, crypto, encoding) ------------ */
.enc-io-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: .5rem .65rem;
  align-items: stretch;
  margin: .35rem 0 .5rem;
}
@media (max-width: 720px) {
  .enc-io-row { grid-template-columns: 1fr; }
  .enc-swap-wrap { justify-self: center; order: 2; }
  .enc-io-field:first-of-type { order: 1; }
  .enc-io-field:last-of-type { order: 3; }
}
.enc-io-field { min-width: 0; }
.enc-swap-wrap {
  display: flex; align-items: center; justify-content: center;
  padding-top: 1.35rem;
}
@media (max-width: 720px) { .enc-swap-wrap { padding-top: 0; } }
button.btn-swap-io {
  width: 2.5rem;
  height: 2.1rem;
  padding: 0;
  font-size: 1.1rem;
  line-height: 1;
  border-radius: var(--r-sm);
  font-family: var(--mono);
}
.enc-actions { align-items: center; gap: .5rem; flex-wrap: wrap; }

/* --- data tables (countries, planets, food, periodic, ...) ----- */
.data-table-wrap {
  width: 100%; max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--panel);
  box-shadow: var(--shadow-1);
}
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: .9rem;
}
.data-table th, .data-table td {
  padding: .5rem .65rem; border-bottom: 1px solid var(--line-2);
  text-align: left; white-space: nowrap;
  vertical-align: middle;
}
/* Zone / description tables: readable first column, numeric columns compact */
.data-table--zones {
  table-layout: fixed;
  max-width: 42rem;
}
.data-table--zones th:nth-child(1),
.data-table--zones td:nth-child(1) {
  width: 50%;
  white-space: normal;
  word-break: break-word;
  padding-right: 1rem;
}
.data-table--zones th:nth-child(2),
.data-table--zones td:nth-child(2) { width: 18%; }
.data-table--zones th:nth-child(3),
.data-table--zones td:nth-child(3) { width: 32%; }
.data-table th {
  position: sticky; top: 0;
  background: var(--panel); border-bottom: 1px solid var(--line);
  font-weight: 600; cursor: pointer; user-select: none;
}
.data-table th:hover { background: var(--hover); }
.data-table td.num, .data-table th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover { background: var(--hover); }
.data-search { width: 100%; max-width: 24rem; margin-bottom: .5rem; }
.truth-table {
  width: max-content;
  min-width: 100%;
  table-layout: fixed;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}
.truth-table th,
.truth-table td {
  text-align: center;
  padding: .42rem .55rem;
  min-width: 3.1rem;
}
.truth-table .truth-expr {
  min-width: 9rem;
  max-width: 18rem;
  white-space: normal;
  overflow-wrap: anywhere;
  line-height: 1.25;
}
.truth-table td.truth-1 { color: #167a3a; font-weight: 700; }
.truth-table td.truth-0 { color: var(--muted); }

/* --- self-test log block --------------------------------------- */
.enc-self .ok  { color: var(--accent); }
.enc-self .err { color: var(--danger); }

/* --- periodic table ------------------------------------------- */
.pt-grid {
  display: grid;
  grid-template-columns: repeat(18, minmax(2.2rem, 1fr));
  gap: 2px;
  font-family: var(--mono); font-size: .68rem;
  margin-bottom: .5rem;
}
.pt-cell {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--panel); border: 1px solid var(--line-2); border-radius: 3px;
  padding: 2px; cursor: pointer; line-height: 1;
  display: flex; flex-direction: column; justify-content: space-between;
}
.pt-cell:hover { outline: 2px solid var(--accent); }
.pt-cell.empty { background: transparent; border: none; cursor: default; pointer-events: none; }
.pt-cell .pt-z { color: var(--muted); font-size: .55rem; }
.pt-cell .pt-sym { font-weight: 700; font-size: 1rem; text-align: center; }
.pt-cell .pt-name { font-size: .5rem; text-align: center; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pt-cell.cat-1 { background: #ffd2d2; color: #1a1a1a; }
.pt-cell.cat-2 { background: #ffe7c2; color: #1a1a1a; }
.pt-cell.cat-3 { background: #ffffc7; color: #1a1a1a; }
.pt-cell.cat-4 { background: #e0ffe0; color: #1a1a1a; }
.pt-cell.cat-5 { background: #d0eaff; color: #1a1a1a; }
.pt-cell.cat-6 { background: #e0d0ff; color: #1a1a1a; }
.pt-cell.cat-7 { background: #ffd0e8; color: #1a1a1a; }
.pt-cell.cat-8 { background: #d8d8d8; color: #1a1a1a; }
.pt-cell.cat-9 { background: #c8e8e8; color: #1a1a1a; }
.pt-detail {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--r); padding: .75rem 1rem;
  display: grid; grid-template-columns: auto 1fr; column-gap: 1rem; row-gap: .25rem;
  font-size: .9rem;
}
.pt-detail dt { color: var(--muted); }
.pt-detail dd { margin: 0; font-family: var(--mono); }
@media (max-width: 720px) { .pt-grid { grid-template-columns: repeat(18, minmax(1.4rem, 1fr)); font-size: .55rem; } .pt-cell .pt-sym { font-size: .75rem; } .pt-cell .pt-name { display: none; } .pt-cell .pt-z { font-size: .45rem; } }

/* --- alphabet / words tables (centred large glyphs) ----------- */
.alphabet-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: .35rem;
}
.alphabet-cell {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: .5rem; gap: .15rem;
  background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r);
}
.alphabet-cell .glyph { font-size: 1.6rem; font-weight: 600; }
.alphabet-cell .name  { font-size: .72rem; color: var(--muted); }

/* --- "coming soon" stub --------------------------------------- */
.stub-msg {
  background: var(--panel); border: 1px dashed var(--line);
  border-radius: var(--r); padding: 1.5rem;
  text-align: center; color: var(--muted);
}

/* --- tab bar (quick access, sits in the topbar middle slot) --- */
#tabbar {
  display: flex; flex-wrap: nowrap; align-items: center; gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}
#tabbar .tab {
  display: inline-flex; align-items: center; gap: .35rem;
  height: 26px; padding: 0 .55rem; max-width: 14rem;
  background: transparent; border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  color: inherit; text-decoration: none;
  font-size: .8rem; line-height: 1;
  white-space: nowrap; flex: 0 0 auto;
}
#tabbar .tab:hover { background: var(--hover); }
#tabbar .tab.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
#tabbar .tab-icon { font-family: var(--mono); font-weight: 700; opacity: .8; }
#tabbar .tab-name { overflow: hidden; text-overflow: ellipsis; }
#tabbar .tab-close {
  border: none; background: transparent; color: inherit;
  font-size: .85rem; padding: 0 .1rem; cursor: pointer; opacity: .5; line-height: 1;
}
#tabbar .tab-close:hover { opacity: 1; color: var(--danger); }
@media (max-width: 520px) { #tabbar .tab-name { display: none; } }

/* --- multi-clipboard ------------------------------------------ */
.clip-grid {
  display: grid; gap: .6rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.clip-slot {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--r); padding: .5rem; display: flex; flex-direction: column; gap: .35rem;
}
.clip-slot textarea { font-family: var(--mono); font-size: .8rem; }
.clip-slot-head { display: flex; justify-content: space-between; align-items: baseline; }
.clip-slot-actions { display: flex; gap: .35rem; }

/* --- metronome ------------------------------------------------- */
.metro-led {
  width: 3rem; height: 3rem; border-radius: 50%;
  background: var(--line-2); margin: .5rem 0;
  transition: background .05s ease;
}
.metro-led.on { background: var(--accent); }
.metro-led.on.accent { background: var(--danger); }

/* --- tuner ----------------------------------------------------- */
.tuner-display {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  margin: 1rem 0; padding: 1rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
}
.tuner-note { font-size: 4rem; font-weight: 700; font-family: var(--mono); }
.tuner-bar {
  position: relative; width: 80%; max-width: 24rem; height: 8px;
  background: var(--line-2); border-radius: 4px;
}
.tuner-needle {
  position: absolute; top: -3px; left: 50%; width: 4px; height: 14px;
  background: var(--accent); border-radius: 2px;
  transform: translateX(-50%); transition: left .08s ease;
}

/* --- bookmarks ------------------------------------------------- */
.bookmark-list { display: grid; gap: .5rem; }
.bookmark-row {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--r); padding: .5rem .75rem;
  display: grid; grid-template-columns: 1fr auto; gap: .25rem 1rem;
}

.banner {
  background: var(--accent-soft); color: var(--accent);
  padding: .55rem .75rem; border-radius: var(--r);
  margin-bottom: .5rem; font-size: .85rem;
}

/* --- key-value display (body, fitness summaries) -------------- */
.kv { display: grid; gap: .15rem; margin-top: .65rem; }
.kv-row { display: grid; grid-template-columns: minmax(11rem, max-content) 1fr; gap: .75rem 1.1rem;
  padding: .45rem .55rem; border-bottom: 1px solid var(--line-2);
  align-items: baseline; min-height: 2.1rem; }
.kv-row dt { color: var(--muted); }
.kv-row dd { margin: 0; font-family: var(--mono); }
.kv-row .ok   { color: var(--accent); }
.kv-row .warn { color: #d97706; }
.kv-row .err  { color: var(--danger); }
.body-out { margin-top: .8rem; }

/* --- language picker chips (grammar) -------------------------- */
.lang-pick { display: flex; flex-wrap: wrap; gap: .35rem; margin: .5rem 0; }
.lang-chip {
  display: inline-flex; align-items: center; gap: .25rem;
  padding: .15rem .55rem; border: 1px solid var(--line); border-radius: 999px;
  font-size: .85rem; cursor: pointer; user-select: none;
  background: var(--panel);
}
.lang-chip:hover { background: var(--hover); }
.lang-chip:has(input:checked) { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.grammar-table th, .grammar-table td { vertical-align: top; white-space: normal; }
.grammar-table th:first-child { color: var(--muted); font-weight: 500; width: 8rem; }

/* --- sudoku --------------------------------------------------- */
.sudoku {
  display: grid; grid-template-columns: repeat(9, minmax(2rem, 2.6rem));
  width: max-content; max-width: 100%;
  border: 2px solid var(--fg); background: var(--panel);
  margin-top: .6rem;
}
.sudoku-cell {
  width: 100%; aspect-ratio: 1 / 1;
  border: 1px solid var(--line-2);
  background: transparent; color: var(--fg);
  font-family: var(--mono); font-size: 1.2rem; text-align: center;
  padding: 0; margin: 0; line-height: 1;
}
.sudoku-cell:focus { outline: 2px solid var(--accent); outline-offset: -2px; z-index: 1; }
.sudoku-cell.given { font-weight: 700; background: var(--hover); cursor: not-allowed; }
.sudoku-cell.hinted { color: var(--accent); }
.sudoku-cell.wrong { background: rgba(239, 68, 68, .15); color: var(--danger); }
/* heavier 3x3 box borders */
.sudoku-cell.top   { border-top:    2px solid var(--fg); }
.sudoku-cell.left  { border-left:   2px solid var(--fg); }
.sudoku-cell.right { border-right:  2px solid var(--fg); }
.sudoku-cell.bot   { border-bottom: 2px solid var(--fg); }

/* --- wordle solver row of 5 boxes ----------------------------- */
.wordle-row { display: inline-flex; gap: 4px; }
.wordle-cell {
  width: 2.6rem; height: 2.6rem;
  text-align: center; font-family: var(--mono); font-size: 1.4rem;
  text-transform: lowercase;
  border: 2px solid var(--line); background: var(--panel); color: var(--fg);
  border-radius: var(--r-sm);
}
.wordle-cell:focus { outline: 2px solid var(--accent); outline-offset: -2px; border-color: var(--accent); }

/* --- spelling-bee center letter accent ------------------------ */
.bee-center { width: 2.6rem; text-align: center; font-weight: 700; color: var(--accent); }

/* --- truth tables (logic-tables tool) ------------------------- */
.truth-table th.truth-expr { font-family: var(--mono); font-weight: normal; text-align: left; }
.truth-table td.truth-1   { color: #2e7d32; font-weight: 700; }
.truth-table td.truth-0   { color: #888; }

/* --- inline checkbox label ------------------------------------ */
label.inline { display: inline-flex; align-items: center; gap: .35rem; font-size: .9rem; }

/* --- editable kernel grid (filters tool) ---------------------- */
.kernel-grid { border-collapse: collapse; margin: .5rem 0; }
.kernel-grid td { padding: 1px; }
.kernel-grid input { width: 4.4rem; font-family: var(--mono); font-size: .9rem; text-align: right; padding: .15rem .25rem; }

/* --- float / integer explorers (shared bit-row styling) ------- */
:root {
  --fpe-sign: #c2410c;   /* warm orange  */
  --fpe-exp:  #1d4ed8;   /* indigo blue  */
  --fpe-mant: #047857;   /* deep green   */
}
:root.theme-dark, :root.theme-auto:where([data-pcs="dark"]) {
  --fpe-sign: #fb923c;
  --fpe-exp:  #93c5fd;
  --fpe-mant: #6ee7b7;
}
@media (prefers-color-scheme: dark) {
  :root.theme-auto {
    --fpe-sign: #fb923c;
    --fpe-exp:  #93c5fd;
    --fpe-mant: #6ee7b7;
  }
}
.fpe-bits {
  margin: .8rem 0;
  display: grid; gap: 2px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .55rem;
  overflow-x: auto;
}
.fpe-bit-row { display: flex; flex-wrap: nowrap; align-items: center; }
.fpe-bit-row.fpe-labels { font-family: var(--mono); font-size: .65rem; opacity: .85; }
.fpe-bit-row.fpe-idx    { font-family: var(--mono); font-size: .58rem; opacity: .55; }
.fpe-bit, .fpe-idx-cell, .fpe-label {
  width: 1.7rem; min-width: 1.7rem; text-align: center;
}
.fpe-label { padding: 0 0 1px; font-weight: 700; line-height: 1; }
.fpe-idx-cell { font-family: var(--mono); padding: 1px 0 0; }
.fpe-bit {
  height: 1.9rem; padding: 0;
  font-family: var(--mono); font-size: .82rem; font-weight: 700;
  border: 1px solid var(--line); background: var(--panel); color: var(--muted);
  cursor: pointer;
  border-radius: 3px;
  transition: filter .08s ease, transform .08s ease;
}
.fpe-bit:hover { filter: brightness(1.05); transform: translateY(-1px); }
.fpe-bit.role-sign { border-color: var(--fpe-sign); }
.fpe-bit.role-exp  { border-color: var(--fpe-exp);  }
.fpe-bit.role-mant { border-color: var(--fpe-mant); }
.fpe-bit.role-sign.on { background: var(--fpe-sign); color: #fff; }
.fpe-bit.role-exp.on  { background: var(--fpe-exp);  color: #fff; }
.fpe-bit.role-mant.on { background: var(--fpe-mant); color: #fff; }
.fpe-label.role-sign { color: var(--fpe-sign); }
.fpe-label.role-exp  { color: var(--fpe-exp);  }
.fpe-label.role-mant { color: var(--fpe-mant); }
.fpe-gap { width: .35rem; min-width: .35rem; }
@media (max-width: 720px) {
  .fpe-bit, .fpe-idx-cell, .fpe-label { width: 1.3rem; min-width: 1.3rem; }
  .fpe-bit { height: 1.6rem; font-size: .72rem; }
  .fpe-bit-row.fpe-idx { font-size: .5rem; }
}
.fpe-breakdown { margin-top: .5rem; }
.fpe-kv td.k.role-sign { color: var(--fpe-sign); }
.fpe-kv td.k.role-exp  { color: var(--fpe-exp);  }
.fpe-kv td.k.role-mant { color: var(--fpe-mant); }
.fpe-kv td.v { font-family: var(--mono); }
.ie-bytes { margin-top: .4rem; }
.small { font-size: .82rem; }

/* --- data interpreter plots ----------------------------------- */
.di-plots { display: grid; gap: .5rem; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.di-plot {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .35rem .5rem;
}
.di-plot svg { display: block; max-width: 100%; height: auto; color: var(--fg); }

/* --- memory explorer ----------------------------------------- */
.mem-split {
  display: grid; gap: .75rem;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 24rem);
  align-items: flex-start;
  margin-top: .5rem;
}
@media (max-width: 900px) { .mem-split { grid-template-columns: 1fr; } }
.mem-hex {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .5rem .65rem; margin: 0;
  font-family: var(--mono); font-size: .82rem; line-height: 1.45;
  max-height: 70vh; overflow: auto; white-space: pre;
}
.mem-row { display: inline; }
.mem-off { color: var(--muted); }
.mem-byte, .mem-ascii-byte { cursor: pointer; padding: 0 1px; border-radius: 2px; }
.mem-byte:hover, .mem-ascii-byte:hover { background: var(--accent-soft); }
.mem-byte.active, .mem-ascii-byte.active {
  background: var(--accent); color: var(--accent-fg);
}
.mem-decode {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .5rem .65rem;
  position: sticky; top: .5rem;
}
.mem-kv td.v { font-family: var(--mono); font-size: .85rem; word-break: break-all; }
.mem-kv td.k { color: var(--muted); width: 11rem; }

/* --- tool body: form vs results (cool metal gray) ----------- */
.tool-view {
  --tool-label: #5a6578;
  --tool-input-bg: linear-gradient(180deg, #eceef3 0%, #e2e6ed 55%, #d9dee6 100%);
  --tool-input-border: #b8c0cc;
  --tool-out-bg: linear-gradient(180deg, rgba(255,255,255,.72) 0%, rgba(245,248,252,.9) 100%);
  --tool-out-border: #c5cdd8;
  --tool-out-shadow: inset 0 1px 0 rgba(255,255,255,.55), 0 1px 2px rgba(15,24,40,.06);
}
:root.theme-dark .tool-view,
:root.theme-auto:where([data-pcs="dark"]) .tool-view {
  --tool-label: #9aa7b8;
  --tool-input-bg: linear-gradient(180deg, #222831 0%, #1a1f28 100%);
  --tool-input-border: #343c4a;
  --tool-out-bg: linear-gradient(180deg, rgba(26,31,40,.95) 0%, rgba(20,24,32,.98) 100%);
  --tool-out-border: #2c3544;
  --tool-out-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 2px 8px rgba(0,0,0,.25);
}
@media (prefers-color-scheme: dark) {
  :root.theme-auto .tool-view {
    --tool-label: #9aa7b8;
    --tool-input-bg: linear-gradient(180deg, #222831 0%, #1a1f28 100%);
    --tool-input-border: #343c4a;
    --tool-out-bg: linear-gradient(180deg, rgba(26,31,40,.95) 0%, rgba(20,24,32,.98) 100%);
    --tool-out-border: #2c3544;
    --tool-out-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 2px 8px rgba(0,0,0,.25);
  }
}
.tool-view .field > label {
  font-weight: 600;
  font-size: .68rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--tool-label);
}
.tool-view .tool-form-row {
  padding: .55rem .75rem;
  margin: 0 0 var(--tool-stack-gap);
  border-radius: var(--r);
  border: 1px solid var(--tool-input-border);
  background: var(--tool-input-bg);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.35);
}
:root.theme-dark .tool-view .tool-form-row,
:root.theme-auto:where([data-pcs="dark"]) .tool-view .tool-form-row {
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05);
}
.tool-view input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
.tool-view select,
.tool-view textarea {
  background: var(--input-bg);
  border-color: var(--tool-input-border);
  box-shadow: inset 0 1px 2px rgba(15,24,40,.05);
}
.tool-view select:not([size]) {
  width: max-content;
  max-width: min(28rem, 100%);
}
.tool-view .wg-panel select {
  width: 100%;
  max-width: none;
}
.tool-view .tool-form-row input,
.tool-view .tool-form-row select,
.tool-view .tool-form-row textarea {
  background: var(--input-bg);
}
:root.theme-dark .tool-view .tool-form-row input,
:root.theme-dark .tool-view .tool-form-row select,
:root.theme-dark .tool-view .tool-form-row textarea,
:root.theme-auto:where([data-pcs="dark"]) .tool-view .tool-form-row input,
:root.theme-auto:where([data-pcs="dark"]) .tool-view .tool-form-row select,
:root.theme-auto:where([data-pcs="dark"]) .tool-view .tool-form-row textarea {
  background: var(--input-bg);
}
.tool-view .tool-results {
  margin-top: .75rem;
  padding: .75rem .9rem 1rem;
  border-radius: var(--r);
  border: 1px solid var(--tool-out-border);
  background: var(--tool-out-bg);
  box-shadow: var(--tool-out-shadow);
}

.world-unified { display: flex; flex-direction: column; gap: .5rem; min-width: 0; }
.world-mode-bar { align-items: center; margin-bottom: .15rem; flex-wrap: wrap; gap: .35rem; }
.world-globe-label { font-weight: 600; font-size: .9rem; }
.world-slot { min-height: 200px; min-width: 0; width: 100%; }

.place-search-list {
  list-style: none; margin: .5rem 0 0; padding: 0;
  max-height: min(60vh, 28rem);
}
.place-search-item {
  padding: .45rem .55rem;
  border-bottom: 1px solid var(--line-2);
}
.place-search-title { font-weight: 600; font-size: .9rem; }
.place-search-sub { font-size: .8rem; color: var(--muted); font-family: var(--mono); margin-top: .15rem; }
.place-search-actions { margin-top: .25rem; }

.sun-moon-cal { margin: .35rem 0 .5rem; max-width: 28rem; }
.sun-moon-cal-nav { align-items: center; gap: .5rem; margin-bottom: .35rem; }
.sun-moon-cal-nav button { padding: .2rem .5rem; }
.sun-moon-cal-label { font-weight: 600; flex: 1; text-align: center; }
.sun-moon-cal-row { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.sun-moon-cal-head .sun-moon-cal-cell { font-size: .65rem; font-weight: 700; color: var(--muted); text-align: center; padding: .2rem 0; }
.sun-moon-cal-cell.sun-moon-cal-empty { min-height: 2rem; }
.sun-moon-cal-day {
  min-height: 2.1rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--panel);
  cursor: pointer;
  font: inherit;
  font-size: .85rem;
}
.sun-moon-cal-day:hover { background: var(--hover); }
.sun-moon-cal-day.sun-moon-sel { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent-soft); font-weight: 700; }
.sun-moon-cal-day.sun-moon-today { background: var(--accent-soft); }
.sun-moon-presets { max-width: min(100%, 28rem); }

.moon-cal-title { margin: .35rem 0 .25rem; }
.moon-cal-nav { margin-bottom: .5rem; align-items: center; }
.moon-cal-grid { max-width: 42rem; }
.moon-cal-row { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; margin-bottom: 3px; }
.moon-cal-cell {
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--panel);
  padding: .25rem .2rem;
  text-align: center;
  min-height: 3.6rem;
}
.moon-cal-cell.moon-cal-h { font-size: .65rem; font-weight: 700; color: var(--muted); min-height: 0; padding: .2rem; border: 0; background: transparent; }
.moon-cal-cell.moon-cal-empty { border: 0; background: transparent; }
.moon-cal-day { font-weight: 700; font-size: .78rem; }
.moon-cal-emoji { font-size: 1.35rem; line-height: 1.2; }
.moon-cal-pct { font-size: .68rem; color: var(--muted); }

.c-decl-out { font-size: 1rem; line-height: 1.5; }
.c-decl-text code { font-size: .92em; }

/* --- world globe / world flat map ---------------------------- */
.wg-root { display: flex; flex-direction: column; gap: .6rem; }
.wg-stage {
  position: relative;
  background: #050a14; border: 1px solid var(--line); border-radius: var(--r);
  overflow: hidden;
  min-height: 320px;
  width: 100%;
}
.wg-stage-flat { background: #eaf3fc; }
.wg-stage canvas.wg-flat { display: block; width: 100%; height: auto; }
.wg-status {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #cbd5e1; font-size: .9rem;
}
.wg-tooltip {
  position: absolute; pointer-events: none;
  background: rgba(15,22,36,0.92); color: #e6edf7;
  padding: .2rem .5rem; border-radius: 4px; font-size: .8rem;
  border: 1px solid rgba(255,255,255,0.2); white-space: nowrap;
}
.wg-panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .6rem .8rem;
  display: grid; gap: .25rem 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
  align-items: start;
}
.wg-panel > * {
  min-width: 0;
}
.wg-panel h3 { margin: 0 0 .25rem; font-size: 1rem; grid-column: 1 / -1; }
.wg-panel .wg-col { display: flex; flex-direction: column; gap: .25rem; }
.wg-panel .field { max-width: none; margin-bottom: .35rem; }
.wg-panel select { max-width: none; width: 100%; }
.wg-panel label.inline { display: flex; align-items: center; gap: .35rem; font-size: .9rem; }
.wg-reset {
  align-self: flex-start; margin: .25rem 0; padding: .25rem .65rem;
  background: var(--panel-2, var(--panel));
  border: 1px solid var(--line); border-radius: var(--r);
  cursor: pointer; font-size: .85rem;
}
.wg-reset:hover { background: var(--accent-soft, transparent); }
.wg-legend {
  padding: .2rem .8rem .35rem;
}
.wg-legend:empty { display: none; }
.wg-legend-title { font-size: .8rem; color: var(--muted); margin-bottom: .2rem; }
.wg-legend-bar   { height: .9rem; border-radius: 2px; border: 1px solid var(--line); }
.wg-legend-ticks {
  position: relative; height: 1.2rem; margin-top: .1rem;
  font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums;
}
.wg-legend-ticks .tick {
  position: absolute; top: 0;
  transform: translateX(-50%); white-space: nowrap;
}
.wg-legend-ticks .tick:first-child { transform: translateX(0);    }
.wg-legend-ticks .tick:last-child  { transform: translateX(-100%); }
.wg-info {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  padding: .5rem .8rem;
}
.wg-info h4 { margin: .1rem 0 .4rem; font-size: .95rem; }
.wg-info-empty { color: var(--muted); font-size: .85rem; }
.wg-kv { display: grid; grid-template-columns: minmax(6rem, 9rem) minmax(0, 1fr); gap: .15rem .6rem; font-size: .85rem; }
.wg-kv > span:nth-child(odd) { color: var(--muted); }
@media (max-width: 520px) {
  .wg-kv {
    grid-template-columns: 1fr;
    gap: .08rem 0;
  }
  .wg-kv > span:nth-child(even) { margin-bottom: .45rem; }
}

/* --- math: matrix table --------------------------------------- */
.mat-table { display: inline-block; margin: .25rem 0; }
.mat-table td { min-width: 3.2rem; padding: .25rem .5rem; text-align: right; font-family: var(--mono); }

/* --- help popup ----------------------------------------------- */
#help[hidden] { display: none; }
#help-backdrop[hidden] { display: none; }
#help-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,.32);
  z-index: 49;
}
#help {
  position: fixed; top: calc(var(--bar-h) + 6px); right: .4rem;
  width: min(34rem, calc(100vw - .8rem));
  max-height: calc(100dvh - var(--bar-h) - 1.2rem);
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r);
  box-shadow: var(--shadow-2);
  z-index: 50;
  display: flex; flex-direction: column;
  overflow: hidden;
}
.help-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: .5rem .75rem; gap: .5rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.help-head h3 { margin: 0; font-size: 1rem; font-weight: 600; }
.help-close {
  border: 0; background: transparent; color: var(--muted);
  cursor: pointer; padding: .15rem .35rem; line-height: 1;
  font-size: 1rem; border-radius: var(--r-sm);
}
.help-close:hover { background: var(--hover); color: var(--fg); }
.help-body {
  padding: .55rem .9rem .9rem;
  overflow-y: auto; font-size: .92rem; line-height: 1.5;
}
.help-body p { margin: .35rem 0 .55rem; }
.help-body h4 {
  margin: .8rem 0 .25rem; font-size: .8rem;
  text-transform: uppercase; letter-spacing: .04em; color: var(--muted);
  font-weight: 700;
}
.help-body ul, .help-body ol { margin: .25rem 0 .55rem; padding-left: 1.3rem; }
.help-body li { margin: .15rem 0; }
.help-body code {
  font-family: var(--mono); font-size: .88em;
  background: var(--bg); padding: 0 .25rem; border-radius: 3px;
  border: 1px solid var(--line-2);
}
.help-body pre {
  background: var(--bg); border: 1px solid var(--line-2); border-radius: var(--r-sm);
  padding: .5rem .65rem; margin: .35rem 0; overflow: auto;
}
.help-body pre code { background: transparent; border: 0; padding: 0; }
.help-body strong { color: var(--fg); }
@media (max-width: 480px) {
  #help { left: .4rem; right: .4rem; width: auto; }
}

/* --- time-zone planner --------------------------------------- */
.tz-grid { display: block; margin-top: .6rem; overflow-x: auto; }
.tz-row  { display: grid; grid-template-columns: 12rem repeat(24, minmax(1.4rem, 1fr)); gap: 1px; background: var(--line); padding: 1px; }
.tz-row + .tz-row { margin-top: 2px; }
.tz-name { background: var(--panel); padding: .25rem .4rem; font-size: .82rem; display: flex; gap: .35rem; align-items: center; }
.tz-name .z-remove { margin-left: auto; background: transparent; border: 0; cursor: pointer; color: var(--muted); padding: 0 .3rem; }
.tz-cell { background: var(--bg); text-align: center; font-family: var(--mono); font-size: .75rem; padding: .25rem 0; color: var(--fg); }
.tz-cell.tz-tick  { background: var(--panel); color: var(--muted); }
.tz-cell.tz-work  { background: rgba(80, 160, 100, .18); }
.tz-cell.tz-sleep { background: rgba(120, 130, 160, .15); color: var(--muted); }
.tz-cell.tz-focus { outline: 2px solid var(--accent); outline-offset: -2px; z-index: 1; }
.tz-cell.tz-day   { border-left: 2px solid var(--accent); }