/* ==========================================================================
   Sprint Faster AI — content hub
   Design tokens: track-red (signature), lane-white (canvas), ink (text),
   pb-gold (reserved accent), asphalt (muted text), paper (cards)
   ========================================================================== */

:root {
  --track-red: #c2410c;
  --track-red-dark: #9a330a;
  --ink: #15171a;
  --lane-white: #edeff1;
  --paper: #ffffff;
  --pb-gold: #c99a3d;
  --asphalt: #5b5f66;
  --line: #d8dadd;

  --font-display: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --font-body: "IBM Plex Sans", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  --max: 1180px;
  --radius: 4px;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--track-red); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.05;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2.2vw, 1.5rem); }

p { margin: 0 0 1.1em; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--track-red);
}

/* Buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 13px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--track-red);
  border-color: var(--track-red);
  color: var(--paper);
}
.btn-primary:hover { background: var(--track-red-dark); border-color: var(--track-red-dark); }

.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

/* Skip link / focus ------------------------------------------------------ */

a:focus-visible, button:focus-visible {
  outline: 3px solid var(--track-red);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* Header ----------------------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 16px;
  padding-bottom: 16px;
  flex-wrap: wrap;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.logo span { color: var(--track-red); }
.logo:hover { text-decoration: none; }

.site-nav {
  display: flex;
  gap: 26px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-nav a { color: var(--ink); }
.site-nav a:hover { color: var(--track-red); text-decoration: none; }

/* Hero --------------------------------------------------------------------*/

.hero {
  background: var(--ink);
  color: var(--paper);
  padding: 78px 0 64px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 78px,
    rgba(255, 255, 255, 0.06) 78px,
    rgba(255, 255, 255, 0.06) 80px
  );
  pointer-events: none;
}

.hero .wrap { position: relative; }

.hero h1 { color: var(--paper); max-width: 14ch; }
.hero h1 em { color: var(--track-red); font-style: normal; }

.hero-sub {
  font-size: 1.15rem;
  max-width: 46ch;
  color: #c9cbce;
  margin-top: 18px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.hero-actions .btn-ghost { border-color: #565a60; color: var(--paper); }
.hero-actions .btn-ghost:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* Lane strip — signature element ------------------------------------------ */

.lanes {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.lane {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  align-items: center;
  gap: 22px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  position: relative;
  text-decoration: none;
  color: var(--ink);
}
.lane:last-child { border-bottom: none; }

.lane::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0%;
  background: var(--track-red);
  transition: width 0.3s ease;
}
.lane:hover::after { width: 100%; }
.lane:hover .lane-num { color: var(--track-red); }
.lane:hover { text-decoration: none; }

.lane-num {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 600;
  color: var(--line);
  transition: color 0.3s ease;
}

.lane-body h3 { margin-bottom: 4px; }
.lane-body p { margin: 0; color: var(--asphalt); font-size: 0.96rem; max-width: 56ch; }

.lane-go {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--asphalt);
}

/* Section scaffolding ------------------------------------------------------*/

.section { padding: 70px 0; }
.section-tight { padding: 44px 0; }
.section-alt { background: var(--lane-white); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.section-head p { color: var(--asphalt); margin: 0; max-width: 48ch; }

/* Article / post cards ------------------------------------------------------*/

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
}

.post-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.post-card:hover {
  border-color: var(--track-red);
  transform: translateY(-3px);
}

.post-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--track-red);
}

.post-card h3 { margin-bottom: 0; font-size: 1.25rem; }
.post-card h3 a { color: var(--ink); }
.post-card h3 a:hover { color: var(--track-red); text-decoration: none; }

.post-excerpt { color: var(--asphalt); font-size: 0.95rem; margin: 0; flex-grow: 1; }

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--asphalt);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* CTA band ------------------------------------------------------------------*/

.cta-band {
  background: var(--track-red);
  color: var(--paper);
  padding: 54px 0;
}
.cta-band h2 { color: var(--paper); margin-bottom: 10px; }
.cta-band p { color: #fde6da; max-width: 50ch; margin-bottom: 26px; }
.cta-band .btn-primary { background: var(--ink); border-color: var(--ink); }
.cta-band .btn-primary:hover { background: #000; border-color: #000; }
.cta-band .btn-ghost { border-color: rgba(255,255,255,0.6); color: var(--paper); }
.cta-band .btn-ghost:hover { background: var(--paper); color: var(--track-red); }

.cta-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}

/* Article / long-form prose --------------------------------------------------*/

.article-head {
  padding: 54px 0 36px;
  border-bottom: 1px solid var(--line);
}

.article-head .post-tag { display: block; margin-bottom: 14px; }
.article-head h1 { font-size: clamp(2rem, 4.6vw, 3.1rem); max-width: 24ch; }
.article-head .dek { font-size: 1.1rem; color: var(--asphalt); max-width: 62ch; margin-top: 14px; }

.byline {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-top: 26px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--asphalt);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.prose {
  max-width: 68ch;
  margin: 0 auto;
  padding: 50px 24px 30px;
}

.prose h2 {
  margin-top: 2em;
  font-size: 1.5rem;
  border-top: 1px solid var(--line);
  padding-top: 0.9em;
}
.prose h2:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.prose h3 { margin-top: 1.6em; font-size: 1.15rem; text-transform: none; letter-spacing: normal; }
.prose p { font-size: 1.04rem; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.5em; font-size: 1.02rem; }
.prose strong { color: var(--ink); }

.pull {
  font-family: var(--font-display);
  font-size: 1.5rem;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 700;
  color: var(--track-red);
  border-left: 3px solid var(--track-red);
  padding-left: 20px;
  margin: 1.8em 0;
  max-width: 90%;
}

.stat-row {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin: 1.6em 0 2em;
  font-family: var(--font-mono);
}
.stat {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-width: 120px;
}
.stat b { display: block; font-size: 1.6rem; color: var(--track-red); }
.stat span { font-size: 0.72rem; color: var(--asphalt); text-transform: uppercase; letter-spacing: 0.06em; }

.inline-cta {
  background: var(--lane-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  margin: 2.4em 0;
}
.inline-cta p { margin-bottom: 14px; }

.related {
  border-top: 1px solid var(--line);
  padding: 50px 0 70px;
}

/* About / bio -----------------------------------------------------------*/

.bio-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 50px;
  align-items: start;
}

.bio-mark {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 800;
  color: var(--track-red);
}

/* Footer -------------------------------------------------------------------*/

.site-footer {
  background: var(--ink);
  color: #c9cbce;
  padding-top: 50px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 36px;
  border-bottom: 1px solid #2b2e33;
}

.footer-inner .logo { color: var(--paper); }
.footer-inner p { max-width: 38ch; color: #9a9ea3; margin-top: 12px; }

.footer-links {
  display: flex;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.footer-links a { color: #c9cbce; }
.footer-links a:hover { color: var(--track-red); }

.footer-bottom {
  padding: 18px 24px 26px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: #75787d;
}

/* Responsive ----------------------------------------------------------------*/

@media (max-width: 720px) {
  .lane { grid-template-columns: 56px 1fr; }
  .lane-go { display: none; }
  .bio-grid { grid-template-columns: 1fr; }
  .bio-mark { width: 120px; }
  .cta-flex { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}