/* ============================================================
   StackFloss design system — tokens first, components second.
   Palette: white base, deep navy ink, one blue accent (from logo).
   ============================================================ */

/* ---------- Fonts (self-hosted variable woff2) ---------- */
@font-face {
  font-family: 'Sora';
  src: url('../fonts/sora-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 100 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 100 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 100 800; font-style: normal; font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --bg: #fdfeff;
  --bg-alt: #f4fafe;
  --ink: #0d2b45;
  --accent: #0aa2e4;
  --accent-deep: #0781b8;
  --accent-2: #00c2d1;          /* gradient partner only — never solo */
  --tint: #e8f6fd;
  --line: rgba(13, 43, 69, 0.12);
  --dim: rgba(13, 43, 69, 0.64);
  --faint: rgba(13, 43, 69, 0.42);
  --inverse-bg: #0d2b45;
  --inverse-ink: #eaf4fb;
  --inverse-dim: rgba(234, 244, 251, 0.66);

  --display: 'Sora', 'Avenir Next', sans-serif;
  --body: 'Inter', 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --space: clamp(4rem, 9vw, 7.5rem);
  --space-sm: clamp(2.25rem, 5vw, 3.5rem);
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --maxw: 76rem;
  --maxtext: 44rem;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(13, 43, 69, 0.08);
  --shadow-lg: 0 18px 50px rgba(13, 43, 69, 0.13);
}

/* ---------- Reset & base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
body {
  font-family: var(--body); color: var(--ink); background: var(--bg);
  line-height: 1.65; font-size: 1rem; -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--display); line-height: 1.15; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); }
h3 { font-size: 1.15rem; }
p { color: var(--dim); max-width: var(--maxtext); }
a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
img, svg { max-width: 100%; display: block; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff;
  padding: 10px 18px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Eyebrow ---------- */
.eyebrow {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; font-family: var(--display); font-weight: 600; font-size: 0.95rem;
  padding: 13px 26px; border-radius: 10px; text-decoration: none; cursor: pointer;
  border: none; transition: transform .15s, box-shadow .15s, background .15s;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(10, 162, 228, 0.3); }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-1px); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-deep); }
.btn-inverse { background: #fff; color: var(--ink); }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(253, 254, 255, 0.92);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 40px; height: 34px; object-fit: contain; }
.brand .word { font-family: var(--display); font-weight: 800; font-size: 1.12rem; color: var(--accent); letter-spacing: -0.01em; }
.brand .word em { font-style: normal; background: linear-gradient(120deg, var(--accent-2), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.primary-nav { display: flex; gap: 26px; }
.primary-nav a { font-size: 0.92rem; font-weight: 500; color: var(--dim); text-decoration: none; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--ink); }
.nav-toggle { display: none; background: none; border: 1.5px solid var(--line); border-radius: 8px; padding: 8px 12px; font-family: var(--mono); font-size: 0.8rem; color: var(--ink); cursor: pointer; }
/* CTA lives in the header bar on desktop and INSIDE the menu on mobile —
   both exist in the DOM; visibility swaps at the breakpoint. */
.nav-cta { display: none; }
.header-cta { padding: 11px 20px; font-size: 0.9rem; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: var(--bg-alt); padding: var(--space) 0; }
.hero .art { position: absolute; inset: 0; pointer-events: none; }
.hero .art svg, .hero .art img { position: absolute; right: -6%; top: -10%; width: 60%; opacity: 0.1; }
.hero-inner { position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero p.lede { font-size: 1.15rem; margin: 22px 0 30px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-family: var(--mono); font-size: 0.74rem; color: var(--faint); letter-spacing: 0.02em; }

/* ---------- Sections ---------- */
.section { padding: var(--space) 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 42rem; margin-bottom: var(--space-sm); }
.section-head p { font-size: 1.05rem; margin-top: 14px; }

/* ---------- Numbered card grid ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; position: relative; transition: transform .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card .num { font-family: var(--mono); font-size: 0.72rem; font-weight: 600; color: var(--accent); letter-spacing: 0.14em; }
.card h3 { margin: 12px 0 10px; }
.card p { font-size: 0.93rem; }
.card a.card-link { display: inline-block; margin-top: 14px; font-size: 0.88rem; font-weight: 600; }

/* ---------- Split panel ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 4.5rem); align-items: center; }
.split.flip > .split-media { order: 2; }
.split-media {
  border-radius: var(--radius); border: 1px solid var(--line); background: var(--tint);
  aspect-ratio: 4 / 3; overflow: hidden; position: relative; display: grid; place-items: center;
}
.split-media > svg, .split-media > img { width: 82%; height: auto; opacity: 0.85; }
.split ul.checks { list-style: none; margin-top: 18px; }
.split ul.checks li { display: flex; gap: 12px; margin-bottom: 12px; font-size: 0.96rem; color: var(--dim); }
.split ul.checks li::before { content: "→"; color: var(--accent); font-weight: 700; flex: none; }

/* ---------- Ticker ---------- */
.ticker { border-block: 1px solid var(--line); padding: 18px 0; overflow: hidden; background: #fff; }
.ticker-track { display: flex; gap: 48px; white-space: nowrap; font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); animation: ticker 38s linear infinite; width: max-content; }
.ticker-track span::after { content: "·"; margin-left: 48px; color: var(--accent); }
@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker-track { animation: none; flex-wrap: wrap; white-space: normal; width: auto; } }

/* ---------- Quote / ethos block ---------- */
.quote { border-left: 3px solid var(--accent); padding: 6px 0 6px 28px; max-width: 40rem; }
.quote p { font-family: var(--display); font-size: 1.3rem; font-weight: 600; color: var(--ink); line-height: 1.4; }
.quote footer { margin-top: 12px; font-family: var(--mono); font-size: 0.74rem; color: var(--faint); letter-spacing: 0.1em; text-transform: uppercase; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 48rem; }
.faq-item { border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; background: #fff; }
.faq-item summary { cursor: pointer; list-style: none; padding: 18px 22px; font-family: var(--display); font-weight: 600; font-size: 0.98rem; display: flex; justify-content: space-between; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--accent); font-size: 1.25rem; font-weight: 400; flex: none; }
.faq-item[open] summary::after { content: "–"; }
.faq-item .faq-a { padding: 0 22px 18px; font-size: 0.93rem; color: var(--dim); }

/* ---------- CTA band ---------- */
.cta-band { background: var(--inverse-bg); color: var(--inverse-ink); position: relative; overflow: hidden; }
.cta-band .art { position: absolute; inset: 0; pointer-events: none; }
.cta-band .art svg, .cta-band .art img { position: absolute; left: -4%; bottom: -30%; width: 52%; opacity: 0.1; }
.cta-band .wrap { position: relative; padding-top: var(--space-sm); padding-bottom: var(--space-sm); display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
.cta-band p { color: var(--inverse-dim); margin-top: 6px; font-size: 0.95rem; }

/* ---------- Forms ---------- */
.form-grid { display: grid; gap: 14px; max-width: 34rem; }
.form-grid label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); }
.form-grid input, .form-grid textarea, .form-grid select {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--line); border-radius: 10px;
  font-family: var(--body); font-size: 0.97rem; color: var(--ink); background: #fff;
}
.form-grid input:focus, .form-grid textarea:focus { border-color: var(--accent); outline: none; }
.form-note { font-size: 0.82rem; color: var(--faint); }
.form-status { font-weight: 600; color: var(--accent-deep); }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ---------- Footer ---------- */
.site-footer { background: var(--inverse-bg); color: var(--inverse-dim); padding: var(--space-sm) 0; font-size: 0.87rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.site-footer h4 { color: #fff; font-size: 0.85rem; margin-bottom: 14px; font-family: var(--mono); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; }
.site-footer a { color: var(--inverse-dim); text-decoration: none; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 9px; }
.footer-legal { border-top: 1px solid rgba(234, 244, 251, 0.14); padding-top: 22px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 0.78rem; }
.site-footer .brand .word { color: #fff; }

/* ---------- Utilities (CSP forbids inline style attributes) ---------- */
.u-mt-10 { margin-top: 10px; }
.u-mt-12 { margin-top: 12px; }
.u-prose-narrow { max-width: 48rem; }
.u-h2-sub { font-size: 1.3rem; }
.u-h2-sub-gap { font-size: 1.3rem; margin-top: 36px; }
.u-fine { margin-top: 36px; font-size: 0.85rem; color: var(--faint); }
.footer-blurb { margin-top: 14px; font-size: 0.85rem; color: var(--inverse-dim); max-width: 22rem; }
.footer-mail { margin-top: 10px; font-size: 0.85rem; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--faint); padding: 18px 0 0; }
.breadcrumb ol { list-style: none; display: flex; gap: 8px; flex-wrap: wrap; }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: var(--line); }
.breadcrumb a { color: var(--faint); }

/* ---------- Page hero (interior) ---------- */
.page-hero { background: var(--bg-alt); padding: var(--space-sm) 0 var(--space-sm); position: relative; overflow: hidden; }
.page-hero .art { position: absolute; inset: 0; pointer-events: none; }
.page-hero .art svg, .page-hero .art img { position: absolute; right: -8%; top: -30%; width: 46%; opacity: 0.08; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); max-width: 46rem; }
.page-hero p.lede { font-size: 1.1rem; margin-top: 16px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-inner, .split, .split.flip { grid-template-columns: 1fr; }
  .split.flip > .split-media { order: 0; }
  .card-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .primary-nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 18px var(--gutter) 22px; gap: 16px;
  }
  .primary-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .nav-cta { display: inline-block; text-align: center; }
}
@media (max-width: 600px) {
  .card-grid, .footer-grid { grid-template-columns: 1fr; }
  .cta-band .wrap { flex-direction: column; align-items: flex-start; }
}