/* Shared styles for Ratio Finder Pro content pages (guides, calculators, stories, legal). */
:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --bg-2: #eef1f7;
  --surface: rgba(255,255,255,.82);
  --surface-strong: #ffffff;
  --surface-soft: #f4f6fb;
  --text: #111522;
  --muted: #6d7485;
  --line: rgba(17,21,34,.095);
  --line-strong: rgba(17,21,34,.16);
  --brand: #6d5dfc;
  --brand-2: #9b72ff;
  --brand-3: #33b4ff;
  --brand-soft: rgba(109,93,252,.11);
  --success: #118b50;
  --shadow-sm: 0 8px 28px rgba(28,31,48,.08);
  --shadow: 0 24px 70px rgba(28,31,48,.12);
  --max: 1180px;
  --read: 760px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #080b12;
    --bg-2: #0d111c;
    --surface: rgba(17,22,34,.76);
    --surface-strong: #121827;
    --surface-soft: #0f1420;
    --text: #f7f8fb;
    --muted: #9aa4b9;
    --line: rgba(255,255,255,.08);
    --line-strong: rgba(255,255,255,.14);
    --brand: #8f83ff;
    --brand-2: #b18aff;
    --brand-3: #55c6ff;
    --brand-soft: rgba(143,131,255,.14);
    --success: #53d18b;
    --shadow-sm: 0 8px 30px rgba(0,0,0,.2);
    --shadow: 0 26px 80px rgba(0,0,0,.34);
  }
}

html[data-theme="light"] { color-scheme: light; }

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #080b12;
  --bg-2: #0d111c;
  --surface: rgba(17,22,34,.76);
  --surface-strong: #121827;
  --surface-soft: #0f1420;
  --text: #f7f8fb;
  --muted: #9aa4b9;
  --line: rgba(255,255,255,.08);
  --line-strong: rgba(255,255,255,.14);
  --brand: #8f83ff;
  --brand-2: #b18aff;
  --brand-3: #55c6ff;
  --brand-soft: rgba(143,131,255,.14);
  --success: #53d18b;
  --shadow-sm: 0 8px 30px rgba(0,0,0,.2);
  --shadow: 0 26px 80px rgba(0,0,0,.34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 2%, rgba(109,93,252,.14), transparent 32rem),
    radial-gradient(circle at 92% 8%, rgba(51,180,255,.09), transparent 32rem),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
  overflow-x: hidden;
}

button, input { font: inherit; color: inherit; }
a { color: var(--brand); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* ---------- Navigation ---------- */
.topnav-wrap {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.topnav {
  width: min(var(--max), calc(100% - 28px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); min-width: 0; }
.brand-mark {
  width: 40px; height: 40px; flex: 0 0 auto;
  border-radius: 13px;
  display: grid; place-items: center;
  color: #fff; font-weight: 900; letter-spacing: -.05em;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,.35), transparent 28%),
    linear-gradient(135deg, var(--brand), var(--brand-2) 58%, var(--brand-3));
  box-shadow: 0 12px 30px rgba(109,93,252,.28);
}
.brand strong { font-size: .98rem; letter-spacing: -.025em; }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-chip {
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: .75rem;
  font-weight: 700;
  text-decoration: none;
}
.nav-chip:hover { color: var(--brand); }
.icon-btn {
  width: 40px; height: 40px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
}

/* ---------- Layout ---------- */
.page {
  width: min(var(--max), calc(100% - 28px));
  margin: 0 auto;
  padding: 26px 0 64px;
}
.crumbs { font-size: .75rem; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--brand); }

.page-hero {
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(109,93,252,.16), rgba(51,180,255,.05) 58%, transparent),
    var(--surface);
  box-shadow: var(--shadow);
}
.eyebrow {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.page-hero h1 {
  margin: 16px 0 10px;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1;
  letter-spacing: -.055em;
  max-width: 860px;
}
.page-hero .lede {
  margin: 0;
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(.95rem, 1.4vw, 1.06rem);
  line-height: 1.7;
}
.meta-line { margin-top: 14px; color: var(--muted); font-size: .74rem; }

.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
  margin-top: 22px;
  align-items: start;
}
.grid-2 > * { min-width: 0; }
.panel {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-sm);
}

/* ---------- Article typography ---------- */
.prose { padding: clamp(20px, 3.5vw, 36px); }
.prose > *:first-child { margin-top: 0; }
.prose h2 { margin: 34px 0 10px; font-size: clamp(1.25rem, 2.2vw, 1.6rem); letter-spacing: -.035em; }
.prose h3 { margin: 24px 0 8px; font-size: 1.02rem; letter-spacing: -.02em; }
.prose p, .prose li { color: var(--muted); font-size: .95rem; line-height: 1.78; }
.prose p { margin: 0 0 14px; max-width: var(--read); }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 16px; max-width: var(--read); }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--text); }
.prose code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: .86em;
  font-weight: 750;
}
.prose blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  border-left: 3px solid var(--brand);
  border-radius: 0 14px 14px 0;
  background: var(--brand-soft);
}
.prose blockquote p { margin: 0; color: var(--text); }

.callout {
  margin: 18px 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-strong);
}
.callout strong { display: block; margin-bottom: 4px; font-size: .86rem; }
.callout p { margin: 0; font-size: .86rem; }

.formula-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; margin: 14px 0 18px; }
.formula-card { padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-strong); }
.formula-card small { display: block; color: var(--muted); font-size: .7rem; margin-bottom: 4px; }
.formula-card code { background: none; padding: 0; }

.table-wrap { margin: 14px 0 20px; overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; }
table { width: 100%; min-width: 520px; border-collapse: collapse; background: var(--surface-strong); }
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line); font-size: .82rem; }
th { background: var(--surface-soft); font-size: .7rem; text-transform: uppercase; letter-spacing: .05em; }
td { color: var(--muted); }
td:first-child { color: var(--brand); font-weight: 800; }
tr:last-child td { border-bottom: 0; }

/* ---------- Sidebar ---------- */
.sidebar { position: sticky; top: 92px; display: grid; gap: 14px; }
.side-card { padding: 18px; }
.side-card h3 { margin: 0 0 6px; font-size: .9rem; letter-spacing: -.02em; }
.side-card p { margin: 0 0 12px; color: var(--muted); font-size: .78rem; line-height: 1.55; }
.side-links { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; }
.side-links a {
  display: block;
  padding: 9px 11px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--text);
  font-size: .78rem;
  font-weight: 700;
  text-decoration: none;
}
.side-links a:hover, .side-links a[aria-current="page"] { color: var(--brand); border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 15px;
  border: 0;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  font-size: .8rem;
  font-weight: 850;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 10px 22px var(--brand-soft);
}
.btn.ghost { color: var(--text); background: var(--surface-strong); border: 1px solid var(--line); box-shadow: none; }
.btn.ghost:hover { color: var(--brand); }
.btn.block { width: 100%; }

/* ---------- Fixed-ratio calculator ---------- */
.calc { padding: clamp(18px, 3vw, 26px); margin-top: 22px; }
.calc-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 22px; align-items: center; }
.calc-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: grid; gap: 7px; color: var(--muted); font-size: .75rem; font-weight: 780; }
.input-box {
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
}
.input-box:focus-within { border-color: var(--brand); box-shadow: 0 0 0 4px var(--brand-soft); }
.input-box input {
  width: 100%; min-width: 0;
  padding: 13px 0;
  border: 0; outline: 0;
  background: transparent;
  color: var(--text);
  font-weight: 820;
  font-size: 1rem;
}
.unit { color: var(--muted); font-size: .7rem; }
.calc-result {
  margin-top: 14px;
  padding: 14px;
  border-radius: 14px;
  background: var(--brand-soft);
}
.calc-result small { display: block; color: var(--muted); font-size: .7rem; margin-bottom: 3px; }
.calc-result strong { font-size: 1.35rem; color: var(--brand); letter-spacing: -.03em; }
.calc-result span { display: block; margin-top: 4px; color: var(--muted); font-size: .72rem; min-height: 1em; }
.calc-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.calc-stage {
  min-height: 250px;
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 45%, rgba(109,93,252,.16), transparent 55%), var(--surface-soft);
}
.calc-shape {
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: -.04em;
  background:
    radial-gradient(circle at 18% 18%, rgba(255,255,255,.24), transparent 22%),
    linear-gradient(135deg, var(--brand), var(--brand-2) 60%, var(--brand-3));
  text-shadow: 0 1px 10px rgba(0,0,0,.25);
}
.size-buttons { display: flex; flex-wrap: wrap; gap: 6px; }
.size-btn {
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text);
  font-size: .74rem;
  font-weight: 750;
  cursor: pointer;
}
.size-btn:hover { color: var(--brand); border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }

/* ---------- Cards & lists ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; margin-top: 22px; }
.card {
  display: block;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: transform .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }
.card small { display: block; color: var(--brand); font-size: .68rem; font-weight: 850; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.card strong { display: block; font-size: 1rem; letter-spacing: -.025em; line-height: 1.3; }
.card p { margin: 8px 0 0; color: var(--muted); font-size: .8rem; line-height: 1.55; }
.card .read { display: inline-block; margin-top: 12px; color: var(--brand); font-size: .76rem; font-weight: 800; }

.faq details { border-bottom: 1px solid var(--line); }
.faq details:first-of-type { border-top: 1px solid var(--line); }
.faq summary {
  padding: 15px 0;
  cursor: pointer;
  font-weight: 800;
  font-size: .9rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 14px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--brand); font-size: 1.2rem; line-height: 1; transition: transform .2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 15px; }

.cta-band {
  margin-top: 22px;
  padding: clamp(20px, 3.5vw, 30px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  background: linear-gradient(135deg, var(--brand-soft), transparent), var(--surface);
}
.cta-band h2 { margin: 0 0 4px; font-size: 1.15rem; letter-spacing: -.03em; }
.cta-band p { margin: 0; color: var(--muted); font-size: .84rem; }

/* ---------- Footer ---------- */
footer {
  width: min(var(--max), calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 36px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: .72rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: inherit; text-decoration: none; }
.footer-links a:hover { color: var(--brand); }

@media (max-width: 900px) {
  .grid-2, .calc-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .card-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .nav-chip.hide-sm { display: none; }
  .brand strong { font-size: .9rem; }
  .card-grid, .formula-grid { grid-template-columns: 1fr; }
  .calc-fields { grid-template-columns: 1fr; }
  .page-hero { border-radius: 22px; }
}