/* RuckTrack docs — Meridian
   Light theme, AMOLED-friendly hero band, mobile-first.
*/

:root {
  --ink: #14181a;
  --ink-soft: #4a5358;
  --ink-mute: #6c757d;
  --paper: #ffffff;
  --paper-soft: #f6f7f8;
  --paper-edge: #e6e9eb;
  --brand: #1a7a3b;       /* darker green for links, AA contrast on white */
  --brand-glow: #44CC22;  /* in-app vibrant green for accents */
  --hero-bg: #0c0f10;     /* near-black for AMOLED showcase band */
  --hero-ink: #f5f7f8;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  font-size: 17px;
}

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

a {
  color: var(--brand);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { text-decoration-thickness: 2px; }

code {
  background: var(--paper-soft);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.92em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- Layout primitives ---------- */

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.wrap-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- Top nav ---------- */

.topnav {
  background: var(--paper);
  border-bottom: 1px solid var(--paper-edge);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  background: rgba(255,255,255,0.92);
}
.topnav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.topnav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.topnav-brand img {
  width: 24px;
  height: 24px;
  border-radius: 5px;
}
.topnav-links {
  margin-left: auto;
  display: flex;
  gap: 1.1rem;
  align-items: center;
  flex-wrap: wrap;
}
.topnav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
}
.topnav-links a:hover { color: var(--brand); }
.topnav-cta {
  background: var(--brand);
  color: #fff !important;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
}
.topnav-cta:hover { background: #14622f; }

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

.hero {
  background: var(--hero-bg);
  color: var(--hero-ink);
  padding: 3.5rem 0 3rem;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(68,204,34,0.6), transparent);
}
.hero-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}
.hero h1 {
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.hero-tag {
  color: var(--brand-glow);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.75rem;
}
.hero-lede {
  font-size: 1.15rem;
  color: #c8cdd0;
  margin: 0 0 1.5rem;
  max-width: 30rem;
}
.hero-ctas {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  align-items: center;
}
.btn {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  border: 1px solid transparent;
  transition: background 0.15s, border 0.15s;
}
.btn-primary {
  background: var(--brand-glow);
  color: #0a1206;
}
.btn-primary:hover { background: #57e034; }
.btn-secondary {
  background: transparent;
  color: var(--hero-ink);
  border-color: rgba(255,255,255,0.25);
}
.btn-secondary:hover { border-color: var(--brand-glow); color: var(--brand-glow); }
.hero-price {
  color: #9aa3a8;
  font-size: 0.95rem;
  margin: 1rem 0 0;
}
.hero-shot {
  display: flex;
  justify-content: center;
}
.hero-shot img {
  max-width: 340px;
  width: 100%;
  filter: drop-shadow(0 20px 60px rgba(68,204,34,0.18)) drop-shadow(0 6px 20px rgba(0,0,0,0.45));
}

/* ---------- Sections ---------- */

section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--paper-edge);
}
section.alt {
  background: var(--paper-soft);
}
section:last-of-type { border-bottom: 0; }

.eyebrow {
  color: var(--brand);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.5rem;
}
h2 {
  font-size: 1.75rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.5rem;
}
p { margin: 0 0 1rem; }
.section-lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin: 0 0 2rem;
  max-width: 40rem;
}

/* ---------- Feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 0;
}
.feature-card {
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: 10px;
  padding: 1.5rem;
}
section.alt .feature-card {
  background: var(--paper);
}
.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}
.feature-card p {
  color: var(--ink-soft);
  font-size: 0.97rem;
  margin: 0;
}

/* ---------- Watch screenshot strip ---------- */

.shots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0 0;
}
.shot {
  text-align: center;
}
.shot img {
  background: #000;
  border-radius: 12px;
  margin: 0 auto;
  max-width: 280px;
  width: 100%;
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}
.shot-caption {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ---------- Feature row (image + text alternating) ---------- */

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin: 2.5rem 0;
}
.row.reverse .row-text { order: 2; }
.row.reverse .row-shot { order: 1; }
.row-shot img {
  max-width: 320px;
  margin: 0 auto;
  background: #000;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);
}
.row-text h3 {
  margin-top: 0;
  font-size: 1.35rem;
}
.row-text p { color: var(--ink-soft); }

/* ---------- Connect screenshots ---------- */

.connect-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 1.5rem 0 0;
  align-items: flex-start;
}
.connect-row img {
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);
  max-width: 380px;
  margin: 0 auto;
  border: 1px solid var(--paper-edge);
}
.connect-row figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-top: 0.75rem;
}

/* ---------- Devices ---------- */

.device-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem 2rem;
  margin: 1.25rem 0 0;
}
.device-grid h4 {
  margin: 1.25rem 0 0.25rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}
.device-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.device-grid li {
  padding: 0.15rem 0;
  font-size: 0.97rem;
}

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

.cta-band {
  background: var(--hero-bg);
  color: var(--hero-ink);
  padding: 3rem 0;
  text-align: center;
}
.cta-band h2 {
  color: var(--hero-ink);
  margin: 0 0 0.5rem;
}
.cta-band p {
  color: #c8cdd0;
  margin: 0 0 1.5rem;
}
.cta-band .btn-primary { background: var(--brand-glow); color: #0a1206; }

/* ---------- TOC, content pages ---------- */

.page-head {
  padding: 2.5rem 0 1.5rem;
}
.page-head h1 {
  margin: 0 0 0.5rem;
  font-size: 2.1rem;
  letter-spacing: -0.01em;
}
.page-head .updated,
.updated {
  color: var(--ink-mute);
  font-size: 0.9rem;
}

.toc {
  background: var(--paper-soft);
  padding: 1.1rem 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--paper-edge);
}
.toc ol { margin: 0; padding-left: 1.25rem; }
.toc a { color: var(--ink); text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.content-page {
  padding-bottom: 3rem;
}
.content-page h2 {
  font-size: 1.4rem;
  margin: 2rem 0 0.5rem;
  scroll-margin-top: 5rem;
}
.content-page h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}
.content-page ul, .content-page ol {
  padding-left: 1.4rem;
  margin: 0.5rem 0 1.25rem;
}
.content-page li { margin-bottom: 0.35rem; }

.back {
  font-size: 0.9rem;
  display: inline-block;
  margin: 0.5rem 0 0;
}

/* ---------- Math block ---------- */
.formula {
  background: var(--paper-soft);
  border-left: 3px solid var(--brand-glow);
  padding: 0.85rem 1.1rem;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95rem;
  margin: 1rem 0;
  overflow-x: auto;
  border-radius: 0 6px 6px 0;
}
.formula em { color: var(--ink-mute); font-style: normal; }

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

footer.site-footer {
  background: var(--paper-soft);
  border-top: 1px solid var(--paper-edge);
  padding: 2rem 0 2.5rem;
  color: var(--ink-mute);
  font-size: 0.92rem;
  margin-top: 0;
}
footer.site-footer a { color: var(--ink-soft); }
.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}
.footer-cols h5 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
}
.footer-cols ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-cols li { padding: 0.15rem 0; }
.footer-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--paper-edge);
}

/* ---------- Mobile ---------- */

@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 2.25rem 0 2rem; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }
  .hero h1 { font-size: 2rem; }
  .hero-lede { margin-left: auto; margin-right: auto; }
  .hero-ctas { justify-content: center; }
  .hero-shot img { max-width: 260px; }
  section { padding: 2.5rem 0; }
  h2 { font-size: 1.45rem; }
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .shots { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .row { grid-template-columns: 1fr; gap: 1.25rem; }
  .row.reverse .row-text,
  .row.reverse .row-shot { order: 0; }
  .row-shot img { max-width: 240px; }
  .connect-row { grid-template-columns: 1fr; }
  .device-grid { grid-template-columns: 1fr; gap: 0.25rem; }
  .topnav-links { gap: 0.75rem; font-size: 0.9rem; }
  .footer-cols { grid-template-columns: 1fr; gap: 1.25rem; }
  .toc { padding: 1rem 1.25rem; }
}

@media (max-width: 420px) {
  .shots { grid-template-columns: 1fr; }
  .topnav-inner { padding: 0.6rem 1rem; }
  .topnav-links a:not(.topnav-cta) { display: none; }
  .topnav-cta { padding: 0.4rem 0.75rem; font-size: 0.85rem; }
}