/* Shared styles for HabitStack's public pages (feature pages and free tools).
   The landing page and terms page inline their own copy of the base styles. */
:root {
  --bg: #0b1220; --surface: #111a2e; --surface-2: #16213a; --border: #22304d;
  --text: #f1f5f9; --muted: #a9b8cc; --soft: #cbd5e1; --accent: #3b82f6; --accent-2: #2563eb; --green: #4ade80; --orange: #fb923c;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.65;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: #93c5fd; }
a:hover { color: #bfdbfe; }
img { max-width: 100%; height: auto; display: block; }
.wrap { margin: 0 auto; max-width: 1120px; padding: 0 20px; }
.narrow { max-width: 760px; }

.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 12px; top: 12px; background: #fff; color: #000; padding: 8px 12px; border-radius: 8px; z-index: 10; }

/* Header */
header.top { border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 5; background: rgba(11,18,32,0.92); backdrop-filter: blur(8px); }
header.top .wrap { align-items: center; display: flex; gap: 16px; justify-content: space-between; padding-bottom: 12px; padding-top: 12px; }
.brand { align-items: center; color: var(--text); display: flex; font-size: 1.15rem; font-weight: 800; gap: 10px; letter-spacing: -0.02em; text-decoration: none; }
.brand:hover { color: var(--text); }
.brand img { border-radius: 10px; height: 36px; width: 36px; }
nav.top-links { align-items: center; display: flex; gap: 18px; }
nav.top-links a.plain { color: var(--muted); font-size: 0.95rem; font-weight: 600; text-decoration: none; }
nav.top-links a.plain:hover { color: var(--text); }

/* Buttons */
.btn { border-radius: 12px; display: inline-block; font-weight: 700; padding: 12px 20px; text-align: center; text-decoration: none; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 6px 20px rgba(37,99,235,0.35); color: #fff; }
.btn-primary:hover { color: #fff; filter: brightness(1.08); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface); color: var(--text); }
.btn-sm { border-radius: 10px; font-size: 0.9rem; padding: 8px 14px; }

/* Breadcrumbs */
.crumbs { color: var(--muted); font-size: 0.85rem; margin: 0 0 14px; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.crumbs li + li::before { color: #64748b; content: "/"; margin-right: 6px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--text); }

/* Hero */
.hero { padding: 48px 0 32px; }
.hero .wrap { align-items: center; display: grid; gap: 48px; grid-template-columns: 1.15fr 0.85fr; }
.hero.solo .wrap { display: block; }
.eyebrow { color: var(--green); font-size: 0.8rem; font-weight: 800; letter-spacing: 0.12em; margin: 0 0 12px; text-transform: uppercase; }
h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); letter-spacing: -0.035em; line-height: 1.1; margin: 0 0 16px; }
h1 span { background: linear-gradient(135deg, #93c5fd, #4ade80); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { color: var(--muted); font-size: 1.12rem; margin: 0 0 26px; max-width: 38rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.small-print { color: var(--muted); font-size: 0.85rem; margin: 14px 0 0; }
.phone { background: #000; border: 1px solid var(--border); border-radius: 34px; box-shadow: 0 30px 80px rgba(0,0,0,0.55); margin: 0 auto; max-width: 300px; overflow: hidden; padding: 8px; }
.phone img { border-radius: 26px; }

/* Sections and article text */
section { padding: 44px 0; }
h2 { font-size: clamp(1.5rem, 2.8vw, 2rem); letter-spacing: -0.03em; line-height: 1.2; margin: 0 0 12px; }
h3 { font-size: 1.15rem; letter-spacing: -0.01em; margin: 22px 0 8px; }
.section-intro { color: var(--muted); font-size: 1.05rem; margin: 0 0 28px; max-width: 42rem; }
.prose p, .prose li { color: var(--soft); }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--accent); }
.prose strong { color: var(--text); }
.prose table { border-collapse: collapse; font-size: 0.95rem; margin: 12px 0 18px; width: 100%; }
.prose th, .prose td { border-bottom: 1px solid var(--border); padding: 10px 12px; text-align: left; }
.prose th { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; }
.prose td { color: var(--soft); }

/* Feature grid and showcase */
.features { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.feature { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 22px; }
.feature h3 { font-size: 1.05rem; margin: 10px 0 6px; }
.feature p { color: var(--muted); font-size: 0.95rem; margin: 0; }
.icon { align-items: center; border-radius: 12px; display: inline-flex; font-size: 1.3rem; height: 42px; justify-content: center; width: 42px; }
.showcase { align-items: center; display: grid; gap: 48px; grid-template-columns: 1fr 1fr; padding: 24px 0; }
.showcase.flip .text { order: 2; }
.showcase h2 { margin-bottom: 12px; }
.showcase p { color: var(--muted); margin: 0 0 14px; }
.ticks { list-style: none; margin: 0; padding: 0; }
.ticks li { color: var(--text); padding: 4px 0 4px 28px; position: relative; }
.ticks li::before { color: var(--green); content: "\2713"; font-weight: 800; left: 4px; position: absolute; }

/* Steps */
.steps { counter-reset: step; display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); list-style: none; margin: 0; padding: 0; }
.steps li { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; counter-increment: step; padding: 20px; }
.steps li::before { align-items: center; background: rgba(59,130,246,0.16); border-radius: 10px; color: #93c5fd; content: counter(step); display: inline-flex; font-weight: 800; height: 32px; justify-content: center; margin-bottom: 10px; width: 32px; }
.steps strong { display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 0.95rem; }

/* Related links */
.related { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.related a { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; color: var(--text); display: block; padding: 16px 18px; text-decoration: none; }
.related a:hover { border-color: #3b82f6; }
.related strong { display: block; }
.related span { color: var(--muted); font-size: 0.9rem; }

/* FAQ */
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 10px; padding: 16px 20px; }
.faq summary { cursor: pointer; font-weight: 700; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { color: var(--muted); content: "+"; float: right; font-weight: 400; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { color: var(--muted); margin: 10px 0 0; }

/* Final call to action */
.final { background: linear-gradient(135deg, rgba(37,99,235,0.2), rgba(74,222,128,0.12)); border: 1px solid var(--border); border-radius: 24px; padding: 40px 28px; text-align: center; }
.final p { color: var(--muted); margin: 0 auto 22px; max-width: 34rem; }

/* Calculators */
.calc { align-items: start; display: grid; gap: 24px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.panel h2 { font-size: 1.2rem; margin-bottom: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field label, .field .label { color: var(--muted); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.field input, .field select {
  background: #0d1526; border: 1px solid var(--border); border-radius: 10px; color: var(--text);
  font: inherit; font-size: 1rem; padding: 10px 12px; width: 100%;
}
.field input:focus, .field select:focus { border-color: var(--accent); outline: 2px solid rgba(59,130,246,0.35); outline-offset: 1px; }
.row { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); }
.unit-input { align-items: center; display: flex; gap: 8px; }
.unit-input input { flex: 1; min-width: 0; }
.unit-input span { color: var(--muted); font-size: 0.9rem; }
.segmented { background: #0d1526; border: 1px solid var(--border); border-radius: 10px; display: flex; padding: 3px; }
.segmented label { border-radius: 8px; color: var(--muted); cursor: pointer; flex: 1; font-size: 0.9rem; font-weight: 600; letter-spacing: 0; padding: 7px 10px; text-align: center; text-transform: none; }
.segmented label { position: relative; }
.segmented input { height: 1px; left: 0; opacity: 0; pointer-events: none; position: absolute; top: 0; width: 1px; }
.segmented input:checked + span { color: #fff; }
.segmented label:has(input:checked) { background: var(--accent-2); color: #fff; }
.segmented input:focus-visible + span { outline: 2px solid #93c5fd; outline-offset: 2px; }
.hint { color: var(--muted); font-size: 0.85rem; margin: -8px 0 14px; }
.result-big { font-size: 2.6rem; font-variant-numeric: tabular-nums; font-weight: 800; letter-spacing: -0.03em; line-height: 1.1; margin: 4px 0 2px; }
.result-big small { color: var(--muted); font-size: 1rem; font-weight: 600; letter-spacing: 0; }
.result-label { color: var(--muted); font-size: 0.85rem; margin: 0 0 16px; }
.stats { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin-bottom: 16px; }
.stat { background: var(--surface-2); border-radius: 12px; padding: 12px 14px; }
.stat b { display: block; font-size: 1.25rem; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 0.8rem; }
.results-table { border-collapse: collapse; font-size: 0.95rem; width: 100%; }
.results-table th, .results-table td { border-bottom: 1px solid var(--border); padding: 9px 4px; text-align: left; }
.results-table th { color: var(--muted); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; }
.results-table td { font-variant-numeric: tabular-nums; }
.results-table tr.current td { color: #93c5fd; font-weight: 700; }
.macro-bar { border-radius: 999px; display: flex; height: 12px; margin: 6px 0 14px; overflow: hidden; }
.macro-bar i { display: block; height: 100%; }
.dot { border-radius: 50%; display: inline-block; height: 10px; margin-right: 6px; width: 10px; }
.empty { color: var(--muted); }
.cta-box { background: var(--surface-2); border: 1px solid var(--border); border-radius: 14px; margin-top: 18px; padding: 16px; }
.cta-box p { color: var(--soft); font-size: 0.95rem; margin: 0 0 12px; }

/* Footer */
footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; margin-top: 40px; padding: 32px 0 40px; }
.footer-grid { display: grid; gap: 24px; grid-template-columns: 1.4fr repeat(3, 1fr); }
.footer-grid p { margin: 8px 0 0; max-width: 18rem; }
.footer-grid h2 { color: var(--text); font-size: 0.8rem; letter-spacing: 0.08em; margin: 0 0 10px; text-transform: uppercase; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 6px; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }
.copyright { border-top: 1px solid var(--border); margin-top: 24px; padding-top: 18px; }

@media (max-width: 860px) {
  .hero .wrap, .showcase, .calc { grid-template-columns: 1fr; gap: 28px; }
  .showcase.flip .text { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  nav.top-links a.plain.hide-sm { display: none; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}
[hidden] { display: none !important; }
.panel.stale .result-big, .panel.stale .stats, .panel.stale .results-table, .panel.stale .macro-bar { opacity: 0.4; }