/* ==========================================================================
   Arrow Flow — landing page

   The page is built from the app's own design system, not a lookalike:
   the palette is a literal transcription of src/theme/palette.ts, the radii
   and type sizes come from src/theme/tokens.ts, and the buttons, cards and
   HUD are the same components the game renders, restated in CSS.

   Two rules carry over from the app and explain most of what follows:
     - Flat. A step in value is the ONLY separation between surfaces.
       No shadows, no borders, no gradients.
     - Weight does the work borders used to do.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Tokens — palette.ts + tokens.ts
   -------------------------------------------------------------------------- */

:root {
  /* Quiet Current, dark — the app's default theme. */
  --bg:        #161b18;
  --floor:     #212823;
  --panel:     #262e28;
  --stone:     #323c35;
  --sheet:     #242b26;
  --ink:       #e6ebe6;
  --ink-dim:   #a3aea7;
  --accent:    #7cb8a4;
  --on-accent: #12201a;
  --heart:     #e0876a;
  --star:      #d9aa54;
  --dot:       rgba(230, 235, 230, 0.13);

  /* The app sets everything in the platform's own humanist sans — SF Pro on
     iOS, Roboto on Android. The web stack reaches the same faces. */
  --sans: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto,
          'Helvetica Neue', Arial, sans-serif;

  /* radius scale, tokens.ts */
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 24px;
  --r-pill: 999px;

  --measure: 1040px;
  --pad: 24px;
}

/* Quiet Current, light — the same river teal on a porcelain-sage ground. */
@media (prefers-color-scheme: light) {
  :root {
    --bg:        #eef1ec;
    --floor:     #e2e7e0;
    --panel:     #ffffff;
    --stone:     #e0e6df;
    --sheet:     #ffffff;
    --ink:       #333f39;
    --ink-dim:   #5c6963;
    --accent:    #3f6e60;
    --on-accent: #f4f9f6;
    --heart:     #c25f3f;
    --star:      #b08a3a;
    --dot:       rgba(51, 63, 57, 0.15);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  color-scheme: dark light;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }

h1, h2, h3 { font-weight: 600; letter-spacing: -0.01em; }

/* The app icon is pixel art — never let the browser smooth it. */
.brand-icon, .hero-icon {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--r-md);
  padding: 12px 16px;
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { left: 12px; top: 12px; }

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

.tnum { font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------------
   Top bar
   -------------------------------------------------------------------------- */

/* The bar is full-bleed so its ground covers what scrolls under it; the
   measure lives on the inner row, lined up with every section below. */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 14px var(--pad);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

/* radius.sm on a 32px tile — the same corner the launcher gives it. */
.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
}

.brand-name { font-size: 17px; font-weight: 600; }
.brand-name em { font-style: normal; color: var(--accent); }

.topnav {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 14px;
}

.topnav a {
  color: var(--ink-dim);
  text-decoration: none;
  font-weight: 500;
  padding: 10px 12px;
  border-radius: var(--r-md);
  transition: color 140ms ease, background-color 140ms ease;
}
.topnav a:hover { color: var(--ink); background: var(--floor); }

/* On a narrow phone the section links crowd the bar. Privacy is the one that
   has to survive — a store listing links straight to it. */
@media (max-width: 560px) {
  .topnav a:not([href$="privacy-policy.html"]) { display: none; }
}

/* --------------------------------------------------------------------------
   Shared section furniture
   -------------------------------------------------------------------------- */

.band { background: var(--floor); }

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 84px var(--pad);
}

.section-head { margin-bottom: 40px; }

.section-title {
  font-size: clamp(24px, 3.4vw, 30px);
  line-height: 1.25;
  margin: 0;
}

.section-sub {
  margin: 10px 0 0;
  color: var(--ink-dim);
  font-size: 16px;
  max-width: 56ch;
}

/* --------------------------------------------------------------------------
   Buttons — src/ui/Button.tsx, size="lg"
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  min-height: 60px;
  min-width: 44px;
  padding: 16px 24px;
  border: 0;
  border-radius: var(--r-lg);
  font-family: inherit;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  /* Sink, don't shadow: the press reads as the surface giving way. */
  transition: transform 120ms ease, opacity 120ms ease, background-color 140ms ease;
}
.btn:active { transform: scale(0.97); opacity: 0.9; }

.btn-primary { background: var(--accent); color: var(--on-accent); }

/* `--on-accent` is tuned for the accent fill; over stone it collapses, so the
   secondary keeps `--ink`. Same note as Button.tsx. */
.btn-secondary { background: var(--stone); color: var(--ink); }

.btn-ghost {
  background: transparent;
  color: var(--ink-dim);
  font-weight: 500;
}
.btn-ghost:hover { background: var(--floor); color: var(--ink); }

/* The store button has nowhere to go until the app is published, so it takes
   the app's off-state language: the secondary fill, not pressable. It is NOT
   faded — this is the line that says where the game ships, and Button.tsx's
   0.6 is for controls that do nothing, not for text that has to be read. */
.btn.is-inert {
  background: var(--stone);
  color: var(--ink);
  cursor: default;
}
.btn.is-inert:active { transform: none; opacity: 1; }
.btn.is-inert .btn-sub { color: var(--ink-dim); opacity: 1; }

.btn-sub {
  font-size: 12px;
  font-weight: 500;
  opacity: 0.85;
}

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

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 40px var(--pad) 96px;
}

/* 96px is 1024/32 wide at radius.xl — an exact divisor of the source art, so
   every drawn pixel lands on the same number of screen pixels. */
.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: var(--r-xl);
  margin-bottom: 24px;
}

/* fontSize.display, weight semibold — the home-screen wordmark. */
.hero-title {
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
}
.hero-title em { font-style: normal; color: var(--accent); }

.hero-tagline {
  margin: 14px 0 0;
  font-size: 17px;
  color: var(--ink-dim);
}

.hero-lede {
  max-width: 44ch;
  margin: 24px 0 0;
  font-size: 17px;
  color: var(--ink-dim);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* The chips reuse the settings-screen tile: a floor-filled pill, caption type,
   no border. */
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.hero-chips li {
  background: var(--floor);
  color: var(--ink-dim);
  border-radius: var(--r-pill);
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 500;
}

@media (prefers-color-scheme: light) {
  /* On the light theme `--floor` sits below `--bg`; the chips would recede
     into the page. The panel is the raised surface there. */
  .hero-chips li { background: var(--panel); }
}

/* -- the phone, and the board playing inside it -- */

.hero-device { justify-self: center; }

/* The device is one flat panel with a screen cut out of it — the value step
   between panel and bg is the whole frame. */
.device {
  width: 304px;
  max-width: 100%;
  background: var(--panel);
  border-radius: 44px;
  padding: 12px;
}

.device-screen {
  display: flex;
  flex-direction: column;
  /* Phone proportions, so the screen reads as a device and not a card. */
  min-height: 460px;
  background: var(--bg);
  border-radius: 33px;
  overflow: hidden;
  /* paddingHorizontal: 14 — the play screen's own inset. */
  padding: 10px 14px 14px;
}

/* boardwrap: { flex: 1 } — the board takes the room the HUD leaves. */
.boardwrap {
  flex: 1;
  display: flex;
  align-items: center;
}

/* ProgressBar.tsx: a 4px rail, deliberately low-contrast, run edge to edge by
   cancelling the screen's horizontal padding. */
.hud-rail {
  height: 4px;
  margin: 0 -14px;
  background: var(--floor);
  overflow: hidden;
}
.hud-rail span {
  display: block;
  height: 4px;
  width: 0;
  border-radius: 2px;
  background: var(--accent);
  transition: width 260ms cubic-bezier(0.33, 0, 0.67, 1);
}

.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 2px;
}

.hud-left { display: flex; align-items: center; gap: 6px; }

/* One shared box, so the row aligns on geometry rather than glyph metrics. */
.hud-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: var(--ink-dim);
}
.hud-icon:first-child { color: var(--ink); }
.hud-icon svg { width: 24px; height: 24px; display: block; }

.hud-center { display: flex; flex-direction: column; align-items: center; gap: 2px; }

.hud-name { font-size: 13px; font-weight: 600; color: var(--ink); white-space: nowrap; }

.hud-hearts { display: flex; gap: 4px; color: var(--heart); font-size: 15px; line-height: 1; }

.hud-meta {
  margin: 0;
  font-size: 11px;
  line-height: 1.45;
  color: var(--ink-dim);
  text-align: right;
  white-space: nowrap;
}
.hud-meta b { font-weight: 400; color: var(--accent); }

#demo {
  display: block;
  width: 100%;
  height: auto;
  padding: 4px 0;
}

.device-caption {
  margin: 18px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--ink-dim);
}

@media (max-width: 880px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
    padding-bottom: 72px;
  }
  .hero-icon, .hero-lede { margin-left: auto; margin-right: auto; }
  .cta-row, .hero-chips { justify-content: center; }
}

/* --------------------------------------------------------------------------
   Rules
   -------------------------------------------------------------------------- */

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.rule {
  background: var(--panel);
  border-radius: var(--r-lg);
  padding: 22px;
}

/* Tabular so the three numerals share a width and the cards line up. */
.rule-num {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 12px;
}

.rule h3 { margin: 0 0 8px; font-size: 17px; }
.rule p { margin: 0; font-size: 15px; color: var(--ink-dim); }

/* --------------------------------------------------------------------------
   Features — the settings-screen card, one per claim
   -------------------------------------------------------------------------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.card {
  background: var(--panel);
  border-radius: var(--r-lg);
  padding: 22px;
}

.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; font-size: 15px; color: var(--ink-dim); }

/* --------------------------------------------------------------------------
   Themes — the four palettes the game actually ships, each swatch painted in
   its own colours rather than described in the page's.
   -------------------------------------------------------------------------- */

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.swatch {
  background: var(--t-bg);
  border-radius: var(--r-lg);
  padding: 18px;
  color: var(--t-ink);
}

/* A board three arrows wide, drawn from the same geometry the game uses, in
   each theme's own ink, accent and dot. The palette is shown, not described. */
.mini {
  display: block;
  width: 84px;
  height: 84px;
  margin-bottom: 16px;
}
.mini-dots  { fill: var(--t-dot); }
.mini-ink    { color: var(--t-ink);    fill: var(--t-ink); }
.mini-accent { color: var(--t-accent); fill: var(--t-accent); }

.swatch-name { font-size: 15px; font-weight: 600; }
.swatch-note { display: block; font-size: 13px; color: var(--t-dim); margin-top: 2px; }

.t-dark  { --t-bg: #161b18; --t-ink: #e6ebe6; --t-dim: #a3aea7; --t-accent: #7cb8a4; --t-dot: rgba(230,235,230,0.13); }
.t-light { --t-bg: #eef1ec; --t-ink: #333f39; --t-dim: #5c6963; --t-accent: #3f6e60; --t-dot: rgba(51,63,57,0.15); }
.t-mocha { --t-bg: #1e1e2e; --t-ink: #cdd6f4; --t-dim: #aeb6d1; --t-accent: #f9e2af; --t-dot: rgba(205,214,244,0.13); }
.t-latte { --t-bg: #eff1f5; --t-ink: #4c4f69; --t-dim: #5c5f77; --t-accent: #df8e1d; --t-dot: rgba(76,79,105,0.16); }

/* --------------------------------------------------------------------------
   Closing
   -------------------------------------------------------------------------- */

.closer { text-align: center; }

.closer-line {
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 auto;
  max-width: 22ch;
}

.closer-sub {
  margin: 16px auto 0;
  max-width: 46ch;
  color: var(--ink-dim);
}

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

.footer { background: var(--floor); }

.footer-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 40px var(--pad) 56px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px 32px;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 15px; }
.footer-links a { color: var(--ink); text-decoration: none; font-weight: 500; }
.footer-links a:hover { color: var(--accent); }

.footer-copy { margin: 0; font-size: 14px; color: var(--ink-dim); }