/* ============================================================
   FREE CALCULATORS TOOLSZ — Neo-Brutalist Design System
   Pure CSS3. No external fonts, no CDN, no frameworks.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --bg: #F4F1E8;            /* warm off-white */
  --bg-soft: #EDE9DC;
  --surface: #FFFFFF;
  --surface-2: #FAF8F1;
  --ink: #141414;
  --ink-soft: #3D3D3D;
  --muted: #6B6B6B;
  --lime: #C6FF3E;
  --lime-deep: #9FDB1E;
  --purple: #8A2BE2;
  --purple-deep: #6D1FBA;
  --pink: #FF2E88;
  --cyan: #2DD4BF;
  --orange: #FF8A3D;
  --border: #141414;
  --shadow: #141414;
  --shadow-soft: rgba(20, 20, 20, .35);
  --radius: 0px;
  --border-w: 3px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --container: 1200px;
  --header-h: 74px;
}

[data-theme="dark"] {
  --bg: #161613;
  --bg-soft: #1D1D19;
  --surface: #21211C;
  --surface-2: #262620;
  --ink: #F2EFE4;
  --ink-soft: #D8D4C4;
  --muted: #A8A494;
  --lime: #C6FF3E;
  --purple: #9B5CFF;
  --pink: #FF4FA3;
  --cyan: #3AE0CB;
  --orange: #FFA05C;
  --border: #F2EFE4;
  --shadow: #000000;
  --shadow-soft: rgba(0, 0, 0, .6);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
ul, ol { list-style: none; }
:focus { outline: none; }
:focus-visible {
  outline: 3px solid var(--purple);
  outline-offset: 3px;
  border-radius: 2px;
}
::selection { background: var(--lime); color: var(--ink); }

/* ---------- Background dot grid ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(var(--ink) 1px, transparent 1.6px);
  background-size: 26px 26px;
  opacity: .07;
}
[data-theme="dark"] body::before { opacity: .12; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
main { flex: 1 0 auto; }
main > .container { padding-top: 40px; padding-bottom: 72px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--purple); color: #fff;
  padding: 12px 18px; font-weight: 800; text-transform: uppercase;
  z-index: 300;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.02;
  text-wrap: balance;
}
h1 { font-size: clamp(2.2rem, 7vw, 4.4rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.4rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }
p { max-width: 72ch; }
.mono, .badge, .label, .section-label, .breadcrumbs, .btn, .tag, .stat-num, .calc-display, .field-label, .result-num, .footer-links li a, .nav-link, .ad-slot {
  font-family: var(--mono);
}
.hl-lime { background: var(--lime); color: var(--ink); padding: 0 .18em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.hl-purple { background: var(--purple); color: #fff; padding: 0 .18em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.hl-pink { background: var(--pink); color: #fff; padding: 0 .18em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }

.section-label {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--surface);
  border: 2px solid var(--border);
  display: inline-block;
  padding: 4px 10px;
  box-shadow: 3px 3px 0 var(--shadow);
  margin-bottom: 18px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface);
  border-bottom: var(--border-w) solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: 18px;
  height: var(--header-h);
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.logo-mark {
  width: 44px; height: 44px;
  background: var(--ink); color: var(--lime);
  border: 2px solid var(--border);
  display: grid; place-items: center;
  box-shadow: 3px 3px 0 var(--purple);
}
.logo-text { font-weight: 900; text-transform: uppercase; font-size: 1.02rem; line-height: 1; letter-spacing: -.02em; }
.logo-text small { display: block; font-size: .62rem; font-weight: 700; letter-spacing: .12em; color: var(--muted); }
.logo-text em { font-style: normal; color: var(--purple); }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav-link {
  font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
  text-decoration: none; padding: 10px 12px; border: 2px solid transparent;
}
.nav-link:hover { border-color: var(--border); background: var(--lime); color: var(--ink); }
.nav-link.is-active { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.icon-btn {
  width: 46px; height: 46px;
  background: var(--surface);
  border: 2px solid var(--border);
  cursor: pointer;
  display: grid; place-items: center;
  box-shadow: 3px 3px 0 var(--shadow);
  transition: transform .06s ease, box-shadow .06s ease;
}
.icon-btn:hover { transform: translate(-2px, -2px); box-shadow: 5px 5px 0 var(--shadow); }
.icon-btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--shadow); }
.icon-btn svg { width: 22px; height: 22px; }

.nav-toggle { display: none; }

/* Mobile nav */
@media (max-width: 1024px) {
  .main-nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: var(--surface);
    border-bottom: var(--border-w) solid var(--border);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 12px;
    display: none;
    max-height: calc(100vh - var(--header-h));
    overflow: auto;
  }
  .main-nav.open { display: flex; }
  .nav-link { border: 2px solid var(--border); margin-bottom: 8px; text-align: center; padding: 14px; font-size: .9rem; }
  .nav-toggle { display: grid; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-weight: 800; text-transform: uppercase; letter-spacing: .03em; font-size: .85rem;
  text-decoration: none;
  border: var(--border-w) solid var(--border);
  padding: 14px 22px;
  cursor: pointer;
  background: var(--surface);
  color: var(--ink);
  box-shadow: 5px 5px 0 var(--shadow);
  transition: transform .06s ease, box-shadow .06s ease, background .1s ease;
  min-height: 48px;
  user-select: none;
  text-align: center;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--shadow); }
.btn:active { transform: translate(3px, 3px); box-shadow: 1px 1px 0 var(--shadow); }
.btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.btn-lime { background: var(--lime); color: var(--ink); }
.btn-purple { background: var(--purple); color: #fff; }
.btn-purple:hover { background: var(--purple-deep); }
.btn-pink { background: var(--pink); color: #fff; }
.btn-ink { background: var(--ink); color: var(--surface); }
.btn-block { width: 100%; }
.btn-sm { padding: 9px 14px; font-size: .75rem; min-height: 42px; }

/* ---------- Badges / tags ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .72rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase;
  border: 2px solid var(--border);
  padding: 6px 10px;
  box-shadow: 2px 2px 0 var(--shadow);
  background: var(--surface);
}
.badge-lime { background: var(--lime); }
.badge-purple { background: var(--purple); color: #fff; }
.badge-pink { background: var(--pink); color: #fff; }
.badge-ink { background: var(--ink); color: var(--surface); }
.badge-cyan { background: var(--cyan); color: var(--ink); }
.badge svg { width: 14px; height: 14px; }

.tag {
  display: inline-block; font-size: .68rem; font-weight: 800;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 3px 8px; border: 2px solid var(--border);
  background: var(--surface);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  border-bottom: var(--border-w) solid var(--border);
  background:
    radial-gradient(var(--ink) 1.4px, transparent 1.8px) 0 0 / 30px 30px,
    var(--bg);
  background-blend-mode: normal;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 48px;
  align-items: center;
  padding: 72px 0 56px;
}
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.hero h1 { font-size: clamp(2.6rem, 6.4vw, 5rem); margin-bottom: 22px; }
.hero-sub { font-size: 1.12rem; color: var(--ink-soft); margin-bottom: 32px; max-width: 52ch; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 16px; }

.hero-visual { position: relative; display: grid; place-items: center; }
.hero-calc {
  width: min(340px, 100%);
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 12px 12px 0 var(--shadow);
  transform: rotate(2.5deg);
  padding: 18px;
}
.hero-calc-screen {
  background: var(--ink); color: var(--lime);
  font-family: var(--mono); font-weight: 700;
  font-size: 1.9rem;
  text-align: right;
  padding: 18px 14px;
  border: 2px solid var(--border);
  margin-bottom: 14px;
  letter-spacing: .04em;
  overflow: hidden;
}
.hero-calc-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.hero-key {
  aspect-ratio: 1;
  border: 2px solid var(--border);
  background: var(--bg-soft);
  display: grid; place-items: center;
  font-family: var(--mono); font-weight: 700; font-size: .9rem;
}
.hero-key:nth-child(4n) { background: var(--lime); }
.hero-key:nth-child(13) { background: var(--purple); color: #fff; }
.hero-key:nth-child(14) { background: var(--pink); color: #fff; }
.hero-bubble {
  position: absolute;
  font-family: var(--mono); font-weight: 800; font-size: .72rem;
  letter-spacing: .05em; text-transform: uppercase;
  border: 2px solid var(--border);
  padding: 8px 12px;
  box-shadow: 4px 4px 0 var(--shadow);
  background: var(--surface);
}
.hero-bubble.b1 { top: -6px; left: -14px; background: var(--pink); color: #fff; transform: rotate(-4deg); }
.hero-bubble.b2 { bottom: 26px; right: -10px; background: var(--lime); transform: rotate(3deg); }

/* Stats strip */
.stats-strip {
  background: var(--ink);
  color: var(--surface);
  border-top: var(--border-w) solid var(--border);
}
.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat-cell {
  padding: 20px 16px;
  text-align: center;
  border-left: 2px solid var(--border);
}
.stat-cell:first-child { border-left: none; }
.stat-num {
  font-size: 1.5rem; font-weight: 800;
  color: var(--lime);
  display: block;
  line-height: 1.1;
}
.stat-lbl { font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

/* Trending bar */
.trending {
  background: var(--purple);
  border-bottom: var(--border-w) solid var(--border);
}
.trending-inner {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 20px;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.trending-inner::-webkit-scrollbar { display: none; }
.trending-label { background: var(--lime); color: var(--ink); }
.trending a {
  color: #fff; font-family: var(--mono); font-size: .78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em; text-decoration: none;
  padding: 6px 8px; border: 2px solid transparent;
}
.trending a:hover { border-color: #fff; background: rgba(255,255,255,.14); }
.trending-sep { color: rgba(255,255,255,.5); }

/* ---------- Sections ---------- */
.section { padding: 64px 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 34px; flex-wrap: wrap; }
.section-title { font-size: clamp(1.7rem, 4vw, 2.7rem); }

/* ---------- Tool cards ---------- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.tool-card {
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 5px 5px 0 var(--shadow);
  padding: 22px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform .08s ease, box-shadow .08s ease;
  position: relative;
}
.tool-card:hover { transform: translate(-3px, -3px); box-shadow: 8px 8px 0 var(--shadow); }
.tool-card:active { transform: translate(1px, 1px); box-shadow: 3px 3px 0 var(--shadow); }
.tool-icon {
  width: 52px; height: 52px;
  border: 2px solid var(--border);
  display: grid; place-items: center;
  background: var(--lime);
  box-shadow: 3px 3px 0 var(--shadow);
}
.tool-icon svg { width: 26px; height: 26px; }
.tool-card h3 { font-size: .98rem; letter-spacing: .01em; text-transform: uppercase; line-height: 1.15; }
.tool-card p { font-size: .85rem; color: var(--muted); line-height: 1.45; }
.tool-card .go { margin-top: auto; font-family: var(--mono); font-weight: 800; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; display: inline-flex; align-items: center; gap: 6px; }
.tool-card .go svg { width: 15px; height: 15px; }
.tool-card:hover .go { color: var(--purple); }
.tool-card .cat-tag { position: absolute; top: -11px; right: 14px; }
[data-theme="dark"] .tool-card .cat-tag { color: var(--ink); }

.tc-lime .tool-icon { background: var(--lime); }
.tc-purple .tool-icon { background: var(--purple); color: #fff; }
.tc-pink .tool-icon { background: var(--pink); color: #fff; }
.tc-cyan .tool-icon { background: var(--cyan); }
.tc-orange .tool-icon { background: var(--orange); }
.tc-ink .tool-icon { background: var(--ink); color: var(--lime); }

/* ---------- Search ---------- */
.search-box {
  position: relative;
  max-width: 640px;
  width: 100%;
}
.search-box input {
  width: 100%;
  border: var(--border-w) solid var(--border);
  background: var(--surface);
  padding: 16px 54px 16px 18px;
  font-size: 1rem;
  font-family: var(--mono);
  box-shadow: 5px 5px 0 var(--shadow);
}
.search-box input::placeholder { color: var(--muted); }
.search-box .icon-btn { position: absolute; right: 6px; top: 6px; box-shadow: none; border: none; background: transparent; }
.search-hits {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 6px 6px 0 var(--shadow);
  z-index: 50;
  max-height: 380px;
  overflow: auto;
  display: none;
}
.search-hits.open { display: block; }
.search-hit {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-bottom: 2px solid var(--border);
  text-decoration: none;
}
.search-hit:last-child { border-bottom: none; }
.search-hit:hover { background: var(--lime); }
.search-hit svg { width: 20px; height: 20px; flex-shrink: 0; }
.search-hit strong { font-size: .9rem; text-transform: uppercase; display: block; }
.search-hit span { font-size: .75rem; color: var(--muted); font-family: var(--mono); text-transform: uppercase; }
.search-empty { padding: 18px; font-family: var(--mono); font-size: .85rem; color: var(--muted); }

/* Category chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.chip {
  border: 2px solid var(--border);
  background: var(--surface);
  font-family: var(--mono); font-size: .75rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .04em;
  padding: 10px 14px; cursor: pointer;
  box-shadow: 3px 3px 0 var(--shadow);
}
.chip:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--shadow); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--surface); }

/* Category tiles */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.cat-tile {
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 5px 5px 0 var(--shadow);
  padding: 24px;
  text-decoration: none;
  display: flex; flex-direction: column; gap: 10px;
  transition: transform .08s ease, box-shadow .08s ease;
}
.cat-tile:hover { transform: translate(-3px, -3px); box-shadow: 8px 8px 0 var(--shadow); }
.cat-tile .count { font-family: var(--mono); font-size: .78rem; font-weight: 800; color: var(--muted); }
.cat-tile h3 { font-size: 1rem; }
.cat-tile p { font-size: .82rem; color: var(--muted); }
.cat-tile .go { margin-top: 8px; font-family: var(--mono); font-weight: 800; font-size: .75rem; text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px; }
.cat-tile .go svg { width: 14px; height: 14px; }

/* ---------- How it works ---------- */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step-card {
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 5px 5px 0 var(--shadow);
  padding: 26px;
  position: relative;
}
.step-num {
  position: absolute; top: -18px; left: 18px;
  background: var(--purple); color: #fff;
  font-family: var(--mono); font-weight: 800;
  font-size: .8rem; letter-spacing: .05em;
  padding: 6px 12px;
  border: 2px solid var(--border);
  box-shadow: 3px 3px 0 var(--shadow);
}
.step-card h3 { margin: 12px 0 10px; font-size: 1rem; }
.step-card p { font-size: .88rem; color: var(--muted); }
.step-icon { width: 46px; height: 46px; border: 2px solid var(--border); display: grid; place-items: center; background: var(--lime); }
.step-icon svg { width: 24px; height: 24px; }

/* ---------- Privacy callout ---------- */
.privacy-band {
  background: var(--ink);
  color: var(--surface);
  border-top: var(--border-w) solid var(--border);
  border-bottom: var(--border-w) solid var(--border);
}
.privacy-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 56px 0; align-items: center; }
.privacy-inner h2 { color: var(--lime); margin-bottom: 14px; }
.privacy-feats { display: grid; gap: 12px; }
.privacy-feat { display: flex; gap: 12px; align-items: flex-start; font-size: .95rem; color: var(--surface); }
.privacy-feat svg { width: 22px; height: 22px; color: var(--lime); flex-shrink: 0; margin-top: 2px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; }
.faq-item {
  border: var(--border-w) solid var(--border);
  background: var(--surface);
  box-shadow: 4px 4px 0 var(--shadow);
  margin-bottom: 16px;
}
.faq-q {
  width: 100%;
  background: transparent;
  border: none;
  padding: 18px 20px;
  text-align: left;
  font-weight: 800;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: .01em;
  cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-q .faq-mark { font-family: var(--mono); font-size: 1.2rem; font-weight: 800; flex-shrink: 0; }
.faq-item[open] .faq-mark { color: var(--purple); }
.faq-a { padding: 0 20px 18px; color: var(--ink-soft); font-size: .95rem; }
.faq-a p { margin-bottom: 10px; }
.faq-a p:last-child { margin-bottom: 0; }
.faq-a code { font-family: var(--mono); font-size: .88em; background: var(--bg-soft); border: 1px solid var(--border); padding: 1px 5px; }

/* ---------- Calculator shell ---------- */
.calc-shell {
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 8px 8px 0 var(--shadow);
  margin: 36px 0;
  position: relative;
}
.calc-header {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  border-bottom: var(--border-w) solid var(--border);
  padding: 16px 22px;
  background: var(--bg-soft);
  flex-wrap: wrap;
}
.calc-header .title { display: flex; align-items: center; gap: 12px; font-weight: 900; text-transform: uppercase; font-size: .95rem; letter-spacing: .02em; }
.calc-header .title svg { width: 24px; height: 24px; }
.calc-body { padding: 26px 22px; }

.calc-display {
  background: var(--ink);
  color: var(--lime);
  border: 2px solid var(--border);
  padding: 20px;
  font-weight: 700;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  text-align: right;
  word-break: break-word;
  margin-bottom: 24px;
  min-height: 76px;
  display: flex; align-items: center; justify-content: flex-end;
}
.calc-display .empty { color: var(--muted); font-size: .9rem; }

.fields-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.fields-grid .span-2 { grid-column: 1 / -1; }

.field { display: flex; flex-direction: column; gap: 8px; }
.field-label {
  font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em;
  display: flex; align-items: center; gap: 8px;
}
.field-label .unit { color: var(--muted); font-weight: 700; }
.field input[type="number"], .field input[type="text"], .field input[type="date"], .field input[type="time"],
.field select, .field textarea {
  border: 2px solid var(--border);
  background: var(--surface-2);
  padding: 13px 14px;
  font-size: 1rem;
  font-family: var(--mono);
  width: 100%;
  min-height: 48px;
  -moz-appearance: textfield;
}
.field input::-webkit-outer-spin-button, .field input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--purple);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--purple) 28%, transparent);
  background: var(--surface);
}
.field.invalid input, .field.invalid select { border-color: var(--pink); box-shadow: 0 0 0 3px color-mix(in srgb, var(--pink) 25%, transparent); }
.field-help { font-size: .78rem; color: var(--muted); }
.field-err { font-size: .78rem; color: var(--pink); font-weight: 800; font-family: var(--mono); text-transform: uppercase; display: none; }
.field.invalid .field-err { display: block; }

.field input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 10px;
  background: var(--bg-soft);
  border: 2px solid var(--border);
  cursor: pointer;
}
.field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 30px; height: 30px;
  background: var(--lime);
  border: 2px solid var(--border);
  box-shadow: 2px 2px 0 var(--shadow);
  cursor: grab;
}
.field input[type="range"]::-moz-range-thumb {
  width: 26px; height: 26px;
  background: var(--lime);
  border: 2px solid var(--border);
  box-shadow: 2px 2px 0 var(--shadow);
  cursor: grab;
  border-radius: 0;
}
.slider-val {
  font-family: var(--mono); font-weight: 800; font-size: .9rem;
  background: var(--bg-soft); border: 2px solid var(--border);
  padding: 6px 12px; min-width: 64px; text-align: center;
}
.slider-row { display: flex; align-items: center; gap: 12px; }

/* radios / checkboxes / toggles */
.radio-row { display: flex; flex-wrap: wrap; gap: 10px; }
.radio-opt {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid var(--border);
  padding: 11px 14px;
  cursor: pointer;
  background: var(--surface-2);
  font-family: var(--mono); font-size: .8rem; font-weight: 700; text-transform: uppercase;
}
.radio-opt input { position: absolute; opacity: 0; pointer-events: none; }
.radio-opt:has(input:checked) { background: var(--lime); box-shadow: 3px 3px 0 var(--shadow); }
[data-theme="dark"] .radio-opt:has(input:checked) { color: var(--ink); }
.check-row { display: flex; align-items: center; gap: 10px; cursor: pointer; }
.check-row input { width: 22px; height: 22px; accent-color: var(--purple); }
.check-row span { font-size: .9rem; }

.mode-tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.mode-tab {
  border: 2px solid var(--border);
  background: var(--surface);
  padding: 12px 16px;
  font-family: var(--mono); font-size: .78rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .03em;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--shadow);
}
.mode-tab[aria-pressed="true"] { background: var(--ink); color: var(--surface); box-shadow: 1px 1px 0 var(--shadow); transform: translate(2px, 2px); }
.mode-tab:hover { transform: translate(-1px, -1px); }

/* results */
.results { margin-top: 24px; border-top: var(--border-w) solid var(--border); padding-top: 22px; }
.results-title { font-size: .8rem; font-family: var(--mono); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.results-title svg { width: 16px; height: 16px; }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.result-block {
  border: 2px solid var(--border);
  background: var(--surface-2);
  padding: 18px;
  box-shadow: 3px 3px 0 var(--shadow);
}
.result-block.primary { background: var(--lime); }
.result-block.purple { background: var(--purple); color: #fff; }
.result-block.pink { background: var(--pink); color: #fff; }
.result-label { font-family: var(--mono); font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; opacity: .75; display: block; margin-bottom: 6px; }
.result-num { font-weight: 900; font-size: clamp(1.2rem, 3vw, 1.8rem); line-height: 1.1; word-break: break-word; }
.result-sub { font-size: .82rem; opacity: .85; margin-top: 4px; }
.result-note { font-size: .8rem; color: var(--muted); margin-top: 12px; }
.result-note a { color: var(--purple); font-weight: 700; }

.result-table-wrap { overflow-x: auto; border: 2px solid var(--border); box-shadow: 3px 3px 0 var(--shadow); margin-top: 16px; }
.result-table { width: 100%; border-collapse: collapse; font-size: .85rem; min-width: 480px; }
.result-table th {
  background: var(--ink); color: var(--surface);
  font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em;
  padding: 10px 12px; text-align: left;
  border-right: 2px solid var(--border);
}
.result-table td { padding: 10px 12px; border-top: 2px solid var(--border); border-right: 2px solid var(--border); font-variant-numeric: tabular-nums; }
.result-table tr:nth-child(even) td { background: var(--bg-soft); }
.result-table td:last-child, .result-table th:last-child { border-right: none; }

.calc-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.calc-actions .btn { flex: 0 1 auto; }

.calc-hint { font-size: .8rem; color: var(--muted); margin-top: 14px; font-style: italic; }

/* dynamic rows */
.dyn-rows { display: grid; gap: 10px; }
.dyn-row { display: grid; gap: 10px; align-items: center; }
.dyn-row .row-del { width: 46px; height: 46px; border: 2px solid var(--border); background: var(--surface); cursor: pointer; display: grid; place-items: center; }
.dyn-row .row-del:hover { background: var(--pink); color: #fff; }
.dyn-row .row-del svg { width: 18px; height: 18px; }
.dyn-add { margin-top: 10px; }

/* scientific */
.sci-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.sci-grid button {
  border: 2px solid var(--border);
  background: var(--surface-2);
  font-family: var(--mono); font-weight: 700; font-size: 1rem;
  min-height: 54px;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--shadow);
}
.sci-grid button:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--shadow); }
.sci-grid button:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--shadow); }
.sci-grid .fn { background: var(--purple); color: #fff; }
.sci-grid .op { background: var(--lime); color: var(--ink); }
.sci-grid .eq { background: var(--pink); color: #fff; }
.sci-grid .clr { background: var(--ink); color: var(--surface); }
[data-theme="dark"] .sci-grid .fn { color: #fff; }
.sci-hist { font-family: var(--mono); font-size: .8rem; color: var(--muted); min-height: 20px; text-align: right; margin-bottom: 6px; }

/* matrix */
.matrix-grid { display: grid; gap: 10px; }
.matrix-row { display: flex; gap: 10px; align-items: center; }
.matrix-row input { width: 90px; }
.matrix-ops { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0; }

/* ---------- Ad placeholders ---------- */
.ad-slot {
  border: 3px dashed var(--muted);
  background: var(--bg-soft);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 6px;
  color: var(--muted);
  font-size: .68rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
  text-align: center;
  padding: 14px;
  margin: 28px 0;
}
.ad-slot.leader { min-height: 100px; }
.ad-slot.rect { min-height: 250px; }
.ad-slot.banner { min-height: 90px; }
.ad-slot svg { width: 22px; height: 22px; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  font-size: .78rem; font-weight: 700;
  letter-spacing: .03em; text-transform: uppercase;
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  margin-bottom: 22px;
  color: var(--muted);
}
.breadcrumbs a { text-decoration: none; color: var(--ink-soft); }
.breadcrumbs a:hover { color: var(--purple); text-decoration: underline; }
.breadcrumbs .sep { color: var(--muted); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { border-bottom: var(--border-w) solid var(--border); background: var(--bg); }
.page-hero-inner { padding: 44px 0 40px; }
.page-hero .eyebrow { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.page-hero h1 { margin-bottom: 14px; }
.page-hero .lead { font-size: 1.08rem; color: var(--ink-soft); max-width: 60ch; }
.page-hero .lead strong { color: var(--purple); }

/* ---------- Prose content ---------- */
.prose { max-width: 860px; }
.prose h2 { margin: 44px 0 16px; padding-bottom: 10px; border-bottom: 3px solid var(--border); }
.prose h3 { margin: 28px 0 12px; }
.prose p, .prose li { font-size: .97rem; color: var(--ink-soft); line-height: 1.7; }
.prose p { margin-bottom: 14px; }
.prose ul, .prose ol { margin: 0 0 16px 22px; }
.prose ul li { list-style: disc; margin-bottom: 8px; }
.prose ol li { list-style: decimal; margin-bottom: 8px; }
.prose code { font-family: var(--mono); font-size: .86em; background: var(--bg-soft); border: 1px solid var(--border); padding: 2px 6px; }
.prose .formula {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 700;
  background: var(--ink); color: var(--lime);
  border: 2px solid var(--border);
  padding: 16px 20px;
  margin: 18px 0;
  overflow-x: auto;
  white-space: nowrap;
}
.prose .callout {
  border: 2px solid var(--border);
  background: var(--lime);
  padding: 16px 20px;
  margin: 18px 0;
  box-shadow: 4px 4px 0 var(--shadow);
  font-size: .92rem;
}
.prose .callout.pink { background: var(--pink); color: #fff; }
.prose .callout.purple { background: var(--purple); color: #fff; }
.prose table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .88rem; }
.prose th { background: var(--ink); color: var(--surface); text-align: left; font-family: var(--mono); font-size: .74rem; text-transform: uppercase; padding: 10px 12px; border: 2px solid var(--border); }
.prose td { padding: 10px 12px; border: 2px solid var(--border); }
.prose tr:nth-child(even) td { background: var(--bg-soft); }
.prose a { color: var(--purple); font-weight: 700; }
[data-theme="dark"] .prose a { color: var(--cyan); }
.prose .toc {
  border: var(--border-w) solid var(--border);
  background: var(--surface);
  box-shadow: 4px 4px 0 var(--shadow);
  padding: 20px 24px;
  margin: 24px 0;
}
.prose .toc h3 { margin: 0 0 10px; font-size: .85rem; font-family: var(--mono); letter-spacing: .08em; color: var(--muted); }
.prose .toc ol { margin: 0; }
.prose .toc li { list-style: none; margin-bottom: 6px; }
.prose .toc a { text-decoration: none; }

/* ---------- Related tools ---------- */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--surface); border-top: var(--border-w) solid var(--border); margin-top: auto; }
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 36px;
  padding: 52px 0 40px;
}
.footer-brand .logo-text { color: var(--surface); }
.footer-brand .logo-text small { color: var(--muted); }
.footer-brand p { color: var(--muted); font-size: .88rem; margin: 16px 0; max-width: 34ch; }
.footer-badges { display: flex; gap: 10px; flex-wrap: wrap; }
.social-row { display: flex; gap: 10px; margin-top: 18px; }
.social-row a {
  width: 44px; height: 44px;
  border: 2px solid var(--muted);
  display: grid; place-items: center;
  color: var(--surface);
}
.social-row a:hover { background: var(--purple); border-color: var(--purple); }
.social-row svg { width: 20px; height: 20px; }
.footer-col h4 { font-size: .8rem; letter-spacing: .1em; color: var(--surface); margin-bottom: 16px; font-family: var(--mono); }
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: var(--muted); text-decoration: none; font-size: .82rem;
  transition: color .1s ease;
}
.footer-links a:hover { color: var(--lime); text-decoration: underline; }
.footer-bottom {
  border-top: 2px solid var(--muted);
  padding: 18px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
}
.footer-bottom .copy { font-size: .8rem; color: var(--muted); font-family: var(--mono); }
.footer-bottom .links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-bottom .links a { color: var(--muted); font-size: .76rem; font-family: var(--mono); text-decoration: none; text-transform: uppercase; letter-spacing: .04em; }
.footer-bottom .links a:hover { color: var(--lime); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--lime);
  border: var(--border-w) solid var(--border);
  font-family: var(--mono); font-size: .85rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .05em;
  padding: 14px 22px;
  box-shadow: 6px 6px 0 var(--purple);
  opacity: 0; pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  z-index: 400;
  max-width: calc(100vw - 40px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Search overlay (header) ---------- */
.search-overlay {
  position: fixed; inset: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: none;
  z-index: 200;
  display: none;
  padding: 8vh 20px 20px;
  overflow: auto;
}
.search-overlay.open { display: block; }
.search-panel {
  max-width: 700px; margin: 0 auto;
  background: var(--surface);
  border: var(--border-w) solid var(--border);
  box-shadow: 10px 10px 0 var(--shadow);
}
.search-panel-head { display: flex; align-items: center; gap: 12px; padding: 14px; border-bottom: var(--border-w) solid var(--border); }
.search-panel-head input { flex: 1; border: none; background: transparent; font-size: 1.1rem; font-family: var(--mono); min-height: 40px; }
.search-panel-head input:focus { outline: none; }
.search-panel-results { max-height: 60vh; overflow: auto; }

/* ---------- Legal / misc pages ---------- */
.legal-grid { display: grid; grid-template-columns: 240px 1fr; gap: 40px; }
.toc-side { position: sticky; top: calc(var(--header-h) + 20px); align-self: start; }
.toc-side a { display: block; padding: 8px 0; border-bottom: 2px solid var(--border); text-decoration: none; font-family: var(--mono); font-size: .8rem; font-weight: 700; text-transform: uppercase; }
.toc-side a:hover { color: var(--purple); }

/* ---------- 404 ---------- */
.err-page { text-align: center; padding: 90px 0; }
.err-num { font-size: clamp(5rem, 18vw, 10rem); font-weight: 900; line-height: 1; color: var(--ink); -webkit-text-stroke: 3px var(--border); }
.err-num span { background: var(--pink); color: #fff; -webkit-text-stroke: 0; padding: 0 .12em; }
.err-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; margin-top: 32px; }

/* ---------- Shortcuts (kbd) ---------- */
kbd {
  font-family: var(--mono); font-size: .8rem;
  background: var(--surface); border: 2px solid var(--border);
  box-shadow: 2px 2px 0 var(--shadow);
  padding: 3px 9px;
  display: inline-block;
}

/* ---------- Print ---------- */
@media print {
  body::before, .site-header, .site-footer, .ad-slot, .calc-actions, .search-overlay, .toast, .breadcrumbs, .related-section, .faq-section { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  .calc-shell { box-shadow: none; border: 2px solid #000; margin: 0 0 20px; }
  .result-block, .calc-body { box-shadow: none !important; break-inside: avoid; }
  a { color: #000 !important; text-decoration: underline; }
  main > .container { padding: 0; }
  .hero-calc, .hero-visual { display: none; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .tools-grid, .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr 1fr; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; padding: 48px 0 40px; }
  .hero-visual { order: -1; transform: scale(.92); }
  .privacy-inner { grid-template-columns: 1fr; gap: 28px; }
  .steps-grid { grid-template-columns: 1fr; }
  .legal-grid { grid-template-columns: 1fr; }
  .toc-side { position: static; }
}
@media (max-width: 720px) {
  .tools-grid, .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .fields-grid { grid-template-columns: 1fr; }
  .fields-grid .span-2 { grid-column: auto; }
  .result-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 26px; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-cell:nth-child(3) { border-left: none; }
  .stat-cell:nth-child(n+3) { border-top: 2px solid var(--border); }
  .section { padding: 44px 0; }
}
@media (max-width: 420px) {
  .tools-grid, .cat-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .hero-ctas .btn { width: 100%; }
  .related-grid { grid-template-columns: 1fr; }
  .calc-body { padding: 20px 14px; }
  .sci-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Mobile polish: prevent horizontal overflow & improve tap targets ---------- */
html, body { max-width: 100%; overflow-x: hidden; }

@media (max-width: 640px) {
  /* Header must never push the page wider than the viewport */
  .header-inner { gap: 10px; min-width: 0; }
  .header-actions { gap: 6px; min-width: 0; flex-shrink: 0; }
  .header-actions .btn { display: none; }          /* "All tools" CTA duplicated in nav */
  .icon-btn { width: 42px; height: 42px; }
  .logo-mark { width: 38px; height: 38px; }
  .logo-text { font-size: .88rem; min-width: 0; }
  .logo-text small { font-size: .55rem; letter-spacing: .08em; }

  /* Comfortable, thumb-friendly footer links (>=44px row height) */
  .footer-links li { margin-bottom: 2px; }
  .footer-links li a { display: block; padding: 12px 0; line-height: 1.25; }
  .links a { display: inline-block; padding: 10px 0; }
}