/* Excel Translator — Shared Styles */
:root {
  --bg: #0f1117;
  --surface: #161922;
  --surface-2: #1d2230;
  --border: #262b3a;
  --text: #e6e8ef;
  --muted: #8a91a4;
  --accent: #4ade80;        /* spreadsheet green */
  --accent-2: #22d3ee;      /* cyan highlight */
  --warn: #fbbf24;
  --error: #f87171;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(0,0,0,0.35);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
}

body.light-theme {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #16a34a;
  --accent-2: #0891b2;
  --warn: #d97706;
  --error: #dc2626;
  --shadow: 0 4px 18px rgba(15,23,42,.08);
}
body.light-theme pre.formula-block { background: #f8fafc; }
body.light-theme kbd { background: #fff; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 16px;
  min-height: 100vh;
  display: flex; flex-direction: column;
}

/* === Header / Nav === */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(8px);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto;
  padding: 14px 22px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.18rem;
  color: var(--text); text-decoration: none;
}
.brand-mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12; border-radius: 8px;
  font-family: var(--mono); font-weight: 800;
}
.nav-links { display: flex; gap: 6px; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); text-decoration: none;
  padding: 8px 12px; border-radius: 8px;
  font-size: 0.94rem; transition: all .15s ease;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); }
.nav-links a.active { color: var(--accent); background: var(--surface-2); }

/* === Layout === */
main { flex: 1; }
.container { max-width: 1180px; margin: 0 auto; padding: 36px 22px; }
.narrow { max-width: 820px; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 2.1rem; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }
p  { color: var(--text); }
.lede { color: var(--muted); font-size: 1.08rem; max-width: 720px; }

/* === Hero === */
.hero {
  background: radial-gradient(1200px 400px at 20% -10%, rgba(74,222,128,.18), transparent 60%),
              radial-gradient(900px 300px at 90% -20%, rgba(34,211,238,.16), transparent 60%),
              var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 1180px; margin: 0 auto; padding: 70px 22px 56px; }
.hero h1 { font-size: clamp(2rem, 4vw, 3.1rem); }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lede { font-size: 1.15rem; margin-top: 12px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }

/* === Buttons === */
.btn {
  display: inline-block; padding: 11px 18px;
  border-radius: 8px; font-weight: 600;
  text-decoration: none; cursor: pointer;
  border: 1px solid transparent; font-size: .96rem;
  transition: transform .12s ease, background .15s ease;
}
.btn-primary { background: var(--accent); color: #0b0d12; }
.btn-primary:hover { transform: translateY(-1px); background: #5cf08d; }
.btn-ghost { color: var(--text); border-color: var(--border); background: var(--surface); }
.btn-ghost:hover { background: var(--surface-2); }

/* === Cards === */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: #36405a; }
.card h3 { margin-bottom: 6px; }
.card p { color: var(--muted); margin: 0; font-size: .96rem; }
.card .tag {
  display: inline-block; font-family: var(--mono); font-size: .78rem;
  background: var(--surface-2); color: var(--accent);
  padding: 3px 8px; border-radius: 6px; margin-bottom: 10px;
}
.card a.more {
  color: var(--accent-2); text-decoration: none; font-weight: 600;
  font-size: .9rem; display: inline-block; margin-top: 12px;
}
.card a.more:hover { text-decoration: underline; }

/* === Code & Formula display === */
code, pre, .formula {
  font-family: var(--mono);
}
.formula {
  display: inline-block;
  background: var(--surface-2);
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: .94rem;
}
pre.formula-block {
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: 8px;
  overflow-x: auto; color: var(--accent);
  font-size: .92rem;
}

/* === Tables === */
table {
  width: 100%; border-collapse: collapse;
  background: var(--surface); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border);
}
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--surface-2); color: var(--muted); font-weight: 600; font-size: .88rem; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
td.mono, th.mono { font-family: var(--mono); }

/* === Forms === */
input[type="text"], select, textarea {
  width: 100%; padding: 12px 14px;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  font-family: var(--sans); font-size: 1rem;
  transition: border-color .15s ease;
}
input[type="text"]:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--accent);
}
label { display: block; margin: 14px 0 6px; color: var(--muted); font-size: .92rem; }

/* === Section helpers === */
.section { padding: 48px 0; }
.section + .section { border-top: 1px solid var(--border); }
.eyebrow {
  display: inline-block; font-family: var(--mono); font-size: .78rem;
  text-transform: uppercase; letter-spacing: .14em;
  color: var(--accent-2); margin-bottom: 8px;
}

/* === Error Decoder specific === */
.error-tag {
  display: inline-block; padding: 2px 8px;
  background: rgba(248,113,113,.15); color: var(--error);
  border: 1px solid rgba(248,113,113,.3);
  border-radius: 6px; font-family: var(--mono); font-size: .85rem;
}
.warn-tag {
  display: inline-block; padding: 2px 8px;
  background: rgba(251,191,36,.12); color: var(--warn);
  border: 1px solid rgba(251,191,36,.3);
  border-radius: 6px; font-family: var(--mono); font-size: .85rem;
}

/* === Result panel (for builder) === */
.result-panel {
  margin-top: 22px; padding: 22px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
  display: none;
}
.result-panel.visible { display: block; }
.result-panel h3 { color: var(--accent); }

/* === Comparison split === */
.compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
@media (max-width: 760px) { .compare { grid-template-columns: 1fr; } }
.compare > div {
  background: var(--surface); border: 1px solid var(--border);
  padding: 18px; border-radius: var(--radius);
}
.compare .new-way { border-left: 3px solid var(--accent); }
.compare .old-way { border-left: 3px solid var(--muted); }

/* === Shortcut keys === */
kbd {
  display: inline-block; min-width: 22px; padding: 3px 8px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-bottom-width: 2px; border-radius: 5px;
  font-family: var(--mono); font-size: .82rem;
  color: var(--text);
}
kbd + kbd { margin-left: 4px; }

/* === Filter chips === */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 22px; }
.chip {
  padding: 6px 12px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--muted); font-size: .88rem; cursor: pointer;
  transition: all .15s ease;
}
.chip:hover { color: var(--text); }
.chip.active { background: var(--accent); color: #0b0d12; border-color: var(--accent); }

/* === Footer === */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  margin-top: 40px;
}
.footer-inner {
  max-width: 1180px; margin: 0 auto; padding: 28px 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px;
  color: var(--muted); font-size: .9rem;
}
.footer-inner a { color: var(--muted); text-decoration: none; }
.footer-inner a:hover { color: var(--text); }

/* === Header tools (theme toggle, lang switch) === */
.header-tools { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.icon-btn {
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  width: 36px; height: 36px; cursor: pointer;
  display: inline-grid; place-items: center;
  font-size: 1rem; transition: background .15s ease;
}
.icon-btn:hover { background: var(--border); }
.lang-toggle {
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 10px; cursor: pointer;
  font-family: var(--mono); font-size: .82rem;
}
.lang-toggle:hover { background: var(--border); }

/* === Copy button on formula blocks === */
.with-copy { position: relative; }
.with-copy .copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: var(--bg); color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 4px 9px; font-size: .76rem; cursor: pointer;
  font-family: var(--sans); opacity: 0; transition: opacity .12s ease, color .12s ease;
}
.with-copy:hover .copy-btn { opacity: 1; }
.with-copy .copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.with-copy .copy-btn.copied { color: var(--accent); border-color: var(--accent); }

/* === History panel === */
.history-list {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px; margin-top: 14px;
  max-height: 240px; overflow-y: auto;
}
.history-list .item {
  display: flex; justify-content: space-between; align-items: center;
  gap: 8px; padding: 8px 10px; border-radius: 6px; cursor: pointer;
  font-family: var(--mono); font-size: .85rem;
  border-bottom: 1px solid var(--border);
}
.history-list .item:last-child { border-bottom: none; }
.history-list .item:hover { background: var(--bg); }
.history-list .item .lang { color: var(--accent-2); font-size: .76rem; }
.history-list .item .formula { color: var(--text); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* === Diff highlight === */
.diff { display: inline; padding: 1px 3px; border-radius: 3px; }
.diff.add { background: rgba(74,222,128,.18); color: var(--accent); }

/* === Version badge === */
.ver-badge {
  display: inline-block;
  background: var(--surface-2); color: var(--accent-2);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 1px 6px; font-family: var(--mono); font-size: .72rem;
  margin-left: 6px;
}

/* === Lint warnings === */
.lint-issue {
  border-left: 3px solid var(--warn);
  background: rgba(251,191,36,.06);
  padding: 10px 14px; margin: 10px 0; border-radius: 0 6px 6px 0;
}
.lint-issue.error { border-color: var(--error); background: rgba(248,113,113,.06); }
.lint-issue.ok { border-color: var(--accent); background: rgba(74,222,128,.06); }
.lint-issue h4 { margin: 0 0 4px; font-size: .96rem; }
.lint-issue p { color: var(--muted); font-size: .9rem; margin: 0; }

/* === Quiz card === */
.quiz-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  text-align: center;
}
.quiz-card .question { font-size: 1.2rem; margin: 12px 0 24px; color: var(--text); }
.quiz-card .options { display: grid; gap: 10px; max-width: 520px; margin: 0 auto; }
.quiz-card .option {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 16px; cursor: pointer;
  text-align: left; font-family: var(--mono); font-size: .95rem;
  transition: all .15s ease;
}
.quiz-card .option:hover { border-color: var(--accent-2); }
.quiz-card .option.correct { border-color: var(--accent); background: rgba(74,222,128,.1); color: var(--accent); }
.quiz-card .option.wrong { border-color: var(--error); background: rgba(248,113,113,.1); color: var(--error); }
.quiz-progress {
  display: flex; justify-content: space-between;
  color: var(--muted); font-size: .9rem; margin-bottom: 14px;
}

/* === Timeline === */
.timeline {
  position: relative; padding-left: 30px;
  border-left: 2px solid var(--border);
  margin: 30px 0;
}
.timeline-item { position: relative; padding-bottom: 30px; }
.timeline-item::before {
  content: ""; position: absolute; left: -38px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--bg);
}
.timeline-item h3 { margin: 0 0 6px; }
.timeline-item .year {
  font-family: var(--mono); color: var(--accent-2);
  font-size: .9rem; margin-bottom: 4px; display: inline-block;
}
.timeline-item p { color: var(--muted); margin: 4px 0 0; font-size: .94rem; }

/* === Toast notification === */
.toast {
  position: fixed; bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--surface); color: var(--text);
  border: 1px solid var(--accent); border-radius: 8px;
  padding: 12px 20px; box-shadow: var(--shadow);
  z-index: 1000; transition: transform .25s ease;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* === Favorites button === */
.fav-btn {
  background: transparent; border: none; cursor: pointer;
  font-size: 1.2rem; color: var(--muted); padding: 4px;
  transition: color .12s ease, transform .15s ease;
}
.fav-btn:hover { color: var(--warn); transform: scale(1.15); }
.fav-btn.active { color: var(--warn); }

/* === Author byline (E-E-A-T) === */
.author-card {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 22px; margin: 36px 0 24px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
}
.author-card .photo {
  width: 72px; height: 72px; border-radius: 50%;
  flex-shrink: 0; background: var(--surface-2);
  background-image: url("img/author.svg");
  background-size: cover; background-position: center;
}
.author-card.subdir .photo {
  background-image: url("../img/author.svg");
}
.author-card .info { flex: 1; }
.author-card .info h4 { margin: 0 0 4px; font-size: 1.05rem; color: var(--text); }
.author-card .info .role {
  display: inline-block; font-family: var(--mono); font-size: .76rem;
  color: var(--accent); background: var(--surface-2);
  padding: 2px 8px; border-radius: 4px; margin-left: 6px; vertical-align: middle;
}
.author-card .info p { margin: 6px 0; color: var(--muted); font-size: .94rem; }
.author-card .info .links { margin-top: 8px; font-size: .88rem; }
.author-card .info .links a { color: var(--accent-2); text-decoration: none; }
.author-card .info .links a + a::before { content: " · "; color: var(--muted); }

/* === Image placeholder slots === */
.img-slot {
  position: relative; width: 100%;
  aspect-ratio: 16 / 8;
  background: var(--surface-2); border: 1px dashed var(--border);
  border-radius: var(--radius);
  display: grid; place-items: center;
  margin: 22px 0;
  overflow: hidden;
}
.img-slot img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.img-slot .caption {
  font-size: .88rem; color: var(--muted); padding: 10px 14px;
  background: rgba(0,0,0,.4); border-radius: 6px;
  position: absolute; bottom: 14px; right: 14px;
  font-family: var(--mono);
}

/* === More menu (for collapsed nav) === */
.nav-more {
  position: relative;
}
.nav-more > a { cursor: pointer; }
.nav-more .nav-more-panel {
  display: none;
  position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 6px;
  min-width: 200px; box-shadow: var(--shadow);
  z-index: 100;
}
.nav-more.open .nav-more-panel { display: block; }
.nav-more .nav-more-panel a {
  display: block; padding: 8px 12px; color: var(--text);
  text-decoration: none; border-radius: 6px; font-size: .94rem;
}
.nav-more .nav-more-panel a:hover { background: var(--surface-2); }

/* === Cookie consent banner === */
.cookie-banner {
  position: fixed; left: 18px; right: 18px; bottom: 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px 22px; z-index: 9999;
  display: none; max-width: 980px; margin: 0 auto;
}
.cookie-banner.show { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.cookie-banner p { margin: 0; flex: 1; min-width: 280px; color: var(--muted); font-size: .95rem; }
.cookie-banner p strong { color: var(--text); }
.cookie-banner a { color: var(--accent-2); }
.cookie-banner .actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* === Legal page formatting === */
.legal-doc {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px;
  margin-top: 24px;
}
.legal-doc h2 { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); }
.legal-doc h2:first-child { border-top: none; padding-top: 0; margin-top: 14px; }
.legal-doc h3 { margin-top: 20px; color: var(--accent-2); }
.legal-doc p, .legal-doc li { color: var(--text); line-height: 1.7; }
.legal-doc ul, .legal-doc ol { padding-left: 22px; }
.legal-doc li { margin: 6px 0; }
.legal-doc strong { color: var(--text); }
.legal-meta { color: var(--muted); font-size: .92rem; margin-bottom: 24px; }

/* === 404 page === */
.error-page {
  text-align: center; padding: 80px 22px;
}
.error-page .code {
  font-family: var(--mono); font-size: clamp(5rem, 18vw, 10rem);
  font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.error-page h1 { font-size: 2rem; margin: 14px 0 8px; }
.error-page p { color: var(--muted); margin: 0 0 24px; }
.error-page .links {
  display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-top: 22px;
}

/* === Author byline === */
.byline {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--radius);
  margin: 22px 0; font-size: .92rem;
}
.byline-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12; display: grid; place-items: center;
  font-family: var(--mono); font-weight: 800; flex-shrink: 0;
}
.byline-meta { color: var(--muted); }
.byline-meta strong { color: var(--text); }

/* === Footer columns (4-col legal-rich) === */
footer.rich {
  background: var(--surface); border-top: 1px solid var(--border);
  margin-top: 60px;
}
.footer-grid {
  max-width: 1180px; margin: 0 auto; padding: 40px 22px 24px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
}
.footer-grid h4 {
  font-size: .82rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--muted); margin: 0 0 14px;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { padding: 4px 0; }
.footer-grid a { color: var(--text); text-decoration: none; font-size: .94rem; }
.footer-grid a:hover { color: var(--accent); }
.footer-grid p { color: var(--muted); font-size: .9rem; margin: 0; line-height: 1.6; }
.footer-bottom {
  max-width: 1180px; margin: 0 auto;
  padding: 18px 22px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  color: var(--muted); font-size: .86rem;
}

/* === FAQ block (used in programmatic pages) === */
.faq-item {
  border-bottom: 1px solid var(--border); padding: 14px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-q {
  font-weight: 600; color: var(--text); margin: 0 0 6px;
  cursor: pointer; user-select: none;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-q::after { content: "+"; color: var(--accent); font-size: 1.4rem; line-height: 1; }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { color: var(--muted); margin: 0; max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.faq-item.open .faq-a { max-height: 600px; padding-top: 6px; }

/* === Mobile responsive === */
@media (max-width: 768px) {
  body { font-size: 15px; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.25rem; }
  .nav-inner { padding: 10px 14px; gap: 10px; flex-wrap: wrap; }
  .brand { font-size: 1rem; }
  .brand-mark { width: 28px; height: 28px; font-size: .92rem; }
  .nav-links {
    order: 3; flex-basis: 100%;
    overflow-x: auto; flex-wrap: nowrap; white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 4px 0; margin: 0 -14px; padding-left: 14px; padding-right: 14px;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { padding: 6px 10px; font-size: .86rem; flex-shrink: 0; }
  .header-tools { gap: 6px; }
  .icon-btn, .lang-toggle { width: 32px; height: 32px; font-size: .85rem; padding: 4px 6px; }
  .lang-toggle { width: auto; padding: 4px 8px; }
  .container { padding: 22px 14px; }
  .hero-inner { padding: 40px 14px 36px; }
  .hero h1 { font-size: clamp(1.6rem, 6vw, 2.2rem); }
  .section { padding: 32px 0; }
  .grid { gap: 14px; }
  .card { padding: 18px; }
  pre.formula-block { font-size: .82rem; padding: 12px; word-break: break-all; white-space: pre-wrap; }
  table { font-size: .82rem; }
  th, td { padding: 8px 6px; }
  .footer-inner { padding: 18px 14px; flex-direction: column; align-items: flex-start; gap: 6px; }
  /* Wrap horizontal table content */
  .container > div[style*="overflow-x"] { margin: 0 -14px; padding: 0 14px; }
}
@media (max-width: 480px) {
  h1 { font-size: 1.45rem; }
  .hero h1 { font-size: 1.5rem; }
  .lede { font-size: 1rem; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  pre.formula-block { font-size: .78rem; }
  .chips { gap: 6px; }
  .chip { padding: 5px 9px; font-size: .8rem; }
  /* Stack translator panels */
  .container .grid.grid-2 { grid-template-columns: 1fr; }
}

/* === Touch-friendly tap targets === */
@media (pointer: coarse) {
  .btn { padding: 12px 16px; }
  .nav-links a { padding: 10px 12px; }
  .chip { padding: 8px 14px; }
}

/* === Misc === */
.hidden { display: none !important; }
.spaced > * + * { margin-top: 14px; }
ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean li { padding: 6px 0; color: var(--muted); }
ul.clean li::before { content: "→ "; color: var(--accent); margin-right: 4px; }