/* The Final Stretch Project — finalstretch.org
   No frameworks, no external fonts, no third-party requests.
   The only JavaScript on the site is the carousel mover in index.html. */

:root {
  --bg: #f6f8fa;
  --bg-band: #eceff3;
  --bg-card: #ffffff;
  --ink: #1f2328;
  --ink-soft: #57606a;
  --accent: #0969da;
  --accent-ink: #0757b0;
  --accent-deep: #0e2440;
  --on-accent: #e6eefa;
  --on-accent-soft: #96b4da;
  --button-ink: #ffffff;
  --rule: #d0d7de;
  --focus: #bc4c00;
  --shadow: 0 1px 2px rgba(31, 35, 40, 0.05), 0 12px 32px rgba(31, 35, 40, 0.08);

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-band: #131922;
    --bg-card: #161b22;
    --ink: #e6edf3;
    --ink-soft: #9198a1;
    --accent: #1f6feb;
    --accent-ink: #58a6ff;
    --accent-deep: #0a1a2f;
    --on-accent: #dbe8fb;
    --on-accent-soft: #87a9d6;
    --button-ink: #ffffff;
    --rule: #30363d;
    --focus: #d29922;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1.05rem;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

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

.container {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

.band {
  padding-block: clamp(3.25rem, 7vw, 5.5rem);
}

.band-tint { background: var(--bg-band); }

.band-accent {
  background: var(--accent-deep);
  color: var(--on-accent);
}

/* Sections rise gently into view as you scroll (scroll-driven CSS,
   no scripts; ignored by old browsers and reduced-motion users). */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .band > .container {
      animation: rise linear both;
      animation-timeline: view();
      animation-range: entry 5% entry 45%;
    }
  }
}

@keyframes rise {
  from { opacity: 0.1; transform: translateY(1.5rem); }
  to   { opacity: 1;   transform: none; }
}

/* Heading-left / content-right editorial split on wide screens */
.split {
  display: grid;
  gap: 1.25rem 4rem;
  align-items: start;
}

@media (min-width: 56rem) {
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
  .split > h2 { margin-top: 0; }
}

/* ---- Type ---- */

h1, h2, h3 {
  font-family: var(--font-ui);
  line-height: 1.15;
  letter-spacing: -0.022em;
  font-weight: 750;
  text-wrap: balance;
}

h2 {
  font-size: clamp(1.7rem, 2.8vw, 2.3rem);
  margin: 0 0 1rem;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.prose-col p { max-width: 42rem; }

a { color: var(--accent-ink); text-underline-offset: 3px; }

.kicker {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-ink);
  margin: 0 0 0.75rem;
}

.kicker::before { content: "// "; opacity: 0.6; }

/* ---- Accessibility helpers ---- */

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--button-ink);
  font-family: var(--font-ui);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus { left: 0.5rem; top: 0.5rem; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  padding-block: 0.8rem;
  font-family: var(--font-ui);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.wordmark img {
  width: 3.25rem;
  height: 3.25rem;
  flex: none;
  filter: drop-shadow(0 1px 3px rgba(3, 41, 79, 0.45));
}

.site-header ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.4rem;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}

.site-header ul a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.98rem;
}

.site-header ul a:hover {
  color: var(--accent-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---- Mobile nav: pure-CSS hamburger (checkbox toggle, no JS) ---- */

.nav-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.nav-burger { display: none; }

@media (min-width: 52rem) {
  .nav-toggle { display: none; }
}

@media (max-width: 51.99rem) {
  /* static header so an open menu scrolls away after an anchor tap */
  .site-header { position: static; }

  /* wordmark and burger share one row on narrow screens */
  .wordmark { font-size: 0.85rem; gap: 0.6rem; }
  .wordmark img { width: 2.5rem; height: 2.5rem; }

  .nav-burger {
    display: grid;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    margin-left: auto;
    border: 1px solid var(--rule);
    border-radius: 10px;
    background: var(--bg-card);
    color: var(--ink);
    cursor: pointer;
  }

  .nav-burger svg {
    width: 1.4rem;
    height: 1.4rem;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
  }

  .nav-burger line {
    transition: transform 0.2s ease, opacity 0.15s ease;
    transform-origin: 12px 12px;
  }

  .nav-toggle:checked ~ .nav-burger line:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
  }
  .nav-toggle:checked ~ .nav-burger line:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-burger line:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
  }

  .nav-toggle:focus-visible ~ .nav-burger {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
  }

  .site-header ul {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    gap: 0.1rem;
    margin: 0.6rem 0 0.25rem;
    padding: 0.6rem 0 0.25rem;
    border-top: 1px solid var(--rule);
  }

  .nav-toggle:checked ~ ul { display: flex; }

  .site-header ul a {
    display: block;
    padding: 0.6rem 0.25rem;
    font-size: 1.05rem;
  }
}

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

.hero {
  position: relative;
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
  background:
    radial-gradient(50rem 26rem at 88% -12%,
      rgba(9, 105, 218, 0.09), transparent 70%);
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  .hero {
    background:
      radial-gradient(50rem 26rem at 88% -12%,
        rgba(31, 111, 235, 0.13), transparent 70%);
  }
}

/* Large seal stamped across the hero's top-right corner; scrolls with
   the page. Partially cropped by the edges, tilted like a hand-pressed
   stamp. Content stacks above it. */
.hero-seal {
  position: absolute;
  top: -2.5rem;
  right: -3rem;
  width: clamp(9rem, 24vw, 21rem);
  height: auto;
  transform: rotate(12deg);
  opacity: 0.95;
  filter: drop-shadow(0 6px 24px rgba(3, 41, 79, 0.35));
  pointer-events: none;
  z-index: 0;
}

@media (min-width: 64rem) {
  .hero-seal { top: -3.5rem; right: -4rem; }
}

/* In dark mode, seat the seal into the page rather than letting it
   float like a glossy sticker on the near-black ground. */
@media (prefers-color-scheme: dark) {
  .hero-seal {
    opacity: 0.9;
    filter: brightness(0.85) saturate(0.9)
      drop-shadow(0 6px 24px rgba(0, 0, 0, 0.5));
  }
}

.hero > .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 64rem) {
  .hero-grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  font-family: var(--font-ui);
}

.badges li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 550;
  color: var(--accent-ink);
  background: var(--bg-card);
  background: color-mix(in srgb, var(--accent) 9%, var(--bg-card));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--rule));
  border-radius: 999px;
  padding: 0.28rem 0.8rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin: 0;
  max-width: 46rem;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent-ink);
}

.lede {
  font-size: clamp(1.15rem, 1.8vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 38rem;
  margin-top: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: 2.25rem;
  font-family: var(--font-ui);
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--button-ink);
  font-weight: 650;
  text-decoration: none;
  padding: 0.8rem 1.5rem;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.button:hover { background: var(--accent-ink); }

.hero-actions .quiet { color: var(--ink-soft); font-weight: 550; }

/* ---- Phone mockup ---- */

.phone {
  width: min(20rem, 86vw);
  margin-inline: auto;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 2.4rem;
  padding: 0.8rem;
  box-shadow: var(--shadow);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  line-height: 1.5;
}

@media (min-width: 64rem) {
  .phone { transform: rotate(-1.5deg); }
}

.phone-screen {
  border: 1px solid var(--rule);
  border-radius: 1.7rem;
  padding: 0.9rem 1rem 1.1rem;
  background: var(--bg);
}

.phone-status {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 0.7rem;
}

.phone-app {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 0.7rem;
}

.phone-app img {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 24%;
}

.phone-query {
  background: var(--accent);
  color: var(--button-ink);
  border-radius: 1.1rem 1.1rem 0.3rem 1.1rem;
  padding: 0.55rem 0.85rem;
  margin: 0 0 0.8rem 1.5rem;
}

.phone-result {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 0.9rem;
  padding: 0.8rem 0.9rem;
}

.phone-meta {
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 0.4rem;
}

.phone-title {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.3;
  margin: 0 0 0.4rem;
}

.phone-body {
  color: var(--ink-soft);
  margin: 0 0 0.55rem;
}

.phone-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  padding-top: 0.5rem;
  margin: 0;
}

.phone-caption {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-align: center;
  margin-top: 0.9rem;
}

/* ---- Commitments ---- */

.section-intro {
  color: var(--ink-soft);
  max-width: 42rem;
}

.commitments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.1rem;
  margin-top: 2.25rem;
}

.commitments-grid article {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 1.4rem 1.5rem 1.5rem;
  box-shadow: var(--shadow);
}

.commitments-grid h3 {
  margin: 0 0 0.45rem;
  font-size: 1.2rem;
  color: var(--accent-ink);
}

.commitments-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: 0.97rem;
}

/* ---- Product test (accent band) ---- */

.band-accent blockquote {
  margin: 0 auto;
  max-width: 52rem;
  text-align: center;
  border: 0;
  padding: 0;
}

.band-accent blockquote p {
  font-family: var(--font-ui);
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.3;
  text-wrap: balance;
  margin: 0;
}

.band-accent .test-kicker {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--on-accent-soft);
  margin: 0 0 1.5rem;
}

.band-accent .test-kicker::before { content: "// "; opacity: 0.6; }

.band-accent .test-note {
  max-width: 44rem;
  margin: 1.75rem auto 0;
  text-align: center;
  color: var(--on-accent-soft);
}

.band-accent a { color: var(--on-accent); }

/* ---- Apps: carousel gallery ---- */

.gallery-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.gallery-controls {
  display: flex;
  gap: 0.5rem;
}

.gal-btn {
  font: inherit;
  font-family: var(--font-ui);
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 50%;
  border: 1px solid var(--rule);
  background: var(--bg-card);
  color: var(--ink);
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
}

.gal-btn:hover {
  border-color: var(--accent-ink);
  color: var(--accent-ink);
}

.gal-btn svg { width: 1.1rem; height: 1.1rem; }

.app-gallery {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: min(85%, 26rem);
  gap: 1.25rem;
  margin-top: 2rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: clamp(1.25rem, 4vw, 2.5rem);
  padding: 0.5rem clamp(1.25rem, 4vw, 2.5rem) 1rem;
  margin-inline: calc(-1 * clamp(1.25rem, 4vw, 2.5rem));
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.app-gallery::-webkit-scrollbar { display: none; }

.app-gallery:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
  border-radius: 8px;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 1.6rem 1.7rem 1.7rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
}

.app-card > p {
  font-family: var(--font-ui);
  font-size: 0.98rem;
}

.app-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.app-icon {
  width: 4rem;
  height: 4rem;
  flex: none;
  border-radius: 22.5%;
  box-shadow: var(--shadow);
}

.app-card h3 { margin: 0.2rem 0 0.25rem; font-size: 1.55rem; }

.app-head h3 { margin: 0.1rem 0 0; }

.app-status {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink);
}

.app-tagline {
  margin: 0 0 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.app-note {
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin-top: auto;
  margin-bottom: 0;
}

/* Carousel motion: cards ease in/out as they cross the gallery's edges. */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view(inline)) {
    .app-card {
      animation: card-enter linear both, card-exit linear both;
      animation-timeline: view(inline), view(inline);
      animation-range: entry 0% entry 100%, exit 0% exit 100%;
    }
  }
}

@keyframes card-enter {
  from { opacity: 0.25; transform: translateX(1.5rem) scale(0.94); }
  to   { opacity: 1;    transform: none; }
}

@keyframes card-exit {
  from { opacity: 1;    transform: none; }
  to   { opacity: 0.25; transform: translateX(-1.5rem) scale(0.94); }
}

/* Carousel position dots, where the CSS carousel spec is supported */
@supports (scroll-marker-group: after) {
  .app-gallery { scroll-marker-group: after; }
  .app-gallery::scroll-marker-group {
    display: grid;
    grid-auto-flow: column;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 1.1rem;
  }
  .app-card::scroll-marker {
    content: "";
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: var(--rule);
    border: 1px solid var(--ink-soft);
    cursor: pointer;
  }
  .app-card::scroll-marker:target-current {
    background: var(--accent);
    border-color: var(--accent);
  }
}

/* ---- Contact ---- */

.contact-link { font-size: 1.35rem; font-weight: 650; }

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

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-band);
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.site-footer .container {
  padding-block: 2.25rem 2.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 2rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a { color: var(--ink-soft); }
.footer-links a:hover { color: var(--accent-ink); }

.footer-note {
  flex-basis: 100%;
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
}