/* ============================================================
   vaxdue explained — birch & pine. An animated walkthrough.
   Dark default (deep pine forest) + light (birch paper).
   Motif: the birch-trunk timeline / lenticel-dash tick marks.
   All text/badge pairings verified for WCAG-AA in both schemes.
   ============================================================ */

:root {
  /* dark (default) — deep pine forest */
  --bg:        #0F231C;
  --surface:   #16302650;
  --surface-s: #183328;
  --card:      #1B3B2E;
  --ink:       #EFE9DC;   /* pale birch — ~13:1 on --bg */
  --muted:     #A9C2B3;   /* ~7:1 on --bg */
  --rail:      #C9D6C2;   /* pale-birch trunk */
  --rail-dim:  #46604f;
  --dash:      #C7CBBE;   /* lenticel charcoal, lifted for dark */
  --accent:    #6FA98C;   /* spruce-mist */
  --accent-ink:#0F231C;
  --line:      #2C4A3B;

  /* status hues — lifted for dark contrast; each also has an icon/text label */
  --st-done:   #7FC99A;
  --st-due:    #E8B94E;   /* marigold */
  --st-over:   #E8845C;   /* clay */
  --st-up:     #9BB0A2;   /* grey-green */
  --st-done-bg: #163624;
  --st-due-bg:  #3a300f;
  --st-over-bg: #3a2016;
  --st-up-bg:   #22332a;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Helvetica, Arial, sans-serif;

  --radius: 14px;
  --radius-sm: 9px;
  --wrap: 1000px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow: 0 18px 44px -26px rgba(0,0,0,0.75);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #F6F2E9;   /* birch paper */
    --surface:   #EFE9DA;
    --surface-s: #ECE4D2;
    --card:      #FBF7EE;
    --ink:       #1F4A38;   /* deep pine — ~8:1 on paper */
    --muted:     #3f5a4b;   /* ~6:1 on paper */
    --rail:      #C6B79A;   /* birch bark */
    --rail-dim:  #d9cdb6;
    --dash:      #3A3A34;   /* lenticel charcoal */
    --accent:    #2E6B4F;   /* spruce */
    --accent-ink:#FBF7EE;
    --line:      #E0D8C4;

    --st-done:   #186640;
    --st-due:    #785400;
    --st-over:   #A8451F;
    --st-up:     #566b5c;
    --st-done-bg: #E4EEE4;
    --st-due-bg:  #F3E8CE;
    --st-over-bg: #F4E1D6;
    --st-up-bg:   #E8EBE1;
    --shadow: 0 18px 40px -28px rgba(31,74,56,0.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.003em;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.02em; line-height: 1.14; }
p { margin: 0; }
em { font-style: normal; font-weight: 700; color: var(--accent); }
code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em; background: var(--surface-s); color: var(--accent);
  padding: 2px 6px; border-radius: 6px; border: 1px solid var(--line);
}

.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 10px; font-weight: 700;
  z-index: 100; transition: top 0.18s var(--ease); text-decoration: none;
}
.skip-link:focus { top: 12px; }

a:focus-visible, button:focus-visible {
  outline: 3px solid var(--st-due);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 22px; width: 100%; }
.eyebrow, .kicker {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--accent); font-weight: 700; margin: 0 0 10px;
}
.kicker { color: var(--muted); }

/* ============================================================ READING-PROGRESS TRUNK */
.progress {
  position: fixed; left: 0; top: 0; bottom: 0; width: 6px; z-index: 40;
  background: var(--rail-dim); opacity: 0.55;
}
.progress__fill {
  position: absolute; left: 0; top: 0; width: 100%; height: 0%;
  background: linear-gradient(180deg, var(--rail), var(--accent));
}
/* lenticel dashes riding the progress trunk */
.progress::after {
  content: ""; position: absolute; left: -3px; width: 12px; height: 100%;
  background-image:
    linear-gradient(var(--dash), var(--dash)),
    linear-gradient(var(--dash), var(--dash)),
    linear-gradient(var(--dash), var(--dash)),
    linear-gradient(var(--dash), var(--dash));
  background-size: 12px 3px;
  background-repeat: no-repeat;
  background-position: 0 14%, 0 38%, 0 62%, 0 86%;
  opacity: 0.7;
}

/* ============================================================ SCENES */
.scene {
  position: relative;
  padding: clamp(64px, 12vh, 130px) 0;
  border-bottom: 1px solid var(--line);
}
.scene--hero {
  min-height: 92vh; display: flex; align-items: center;
  background:
    radial-gradient(1100px 520px at 82% -12%, rgba(111,169,140,0.12), transparent 60%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 88%, black) 0%, var(--bg) 100%);
}
@media (prefers-color-scheme: light) {
  .scene--hero { background: radial-gradient(1000px 480px at 84% -10%, rgba(46,107,79,0.09), transparent 60%), var(--bg); }
}
.scene--timeline { background: var(--surface-s); }
.scene--privacy { background:
    radial-gradient(900px 500px at 12% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 55%),
    var(--bg); }
.scene--cta {
  background:
    radial-gradient(900px 520px at 50% 120%, rgba(111,169,140,0.16), transparent 60%),
    var(--surface-s);
  text-align: center;
}

/* ============================================================ HERO */
.hero__title {
  font-size: clamp(1.9rem, 5vw, 3rem);
  letter-spacing: -0.03em; margin: 12px 0 18px; max-width: 20ch;
}
.hero__lede { color: var(--muted); font-size: clamp(1.05rem, 2.2vw, 1.25rem); max-width: 56ch; }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero__scrollhint {
  margin-top: 46px; color: var(--muted); font-size: 0.86rem;
  text-transform: uppercase; letter-spacing: 0.12em; font-weight: 600;
}
.hero__arrow { display: inline-block; animation: bob 1.8s var(--ease) infinite; }
@keyframes bob { 0%,100%{ transform: translateY(0);} 50%{ transform: translateY(5px);} }

/* ============================================================ BUTTONS */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--sans); font-size: 0.98rem; font-weight: 700;
  padding: 13px 22px; border-radius: var(--radius-sm);
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: transform 0.08s var(--ease), background 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow); }
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 88%, white); }
.btn--ghost { background: var(--card); color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--accent); }
.btn--lg { font-size: 1.1rem; padding: 16px 34px; }

/* ============================================================ TWO-COLUMN SCENES */
.two {
  display: grid; gap: clamp(28px, 5vw, 60px);
  grid-template-columns: 1fr 1fr; align-items: center;
}
.two--rev .two__text { order: 2; }
.two--rev .two__vis { order: 1; }
@media (max-width: 760px) {
  .two { grid-template-columns: 1fr; }
  .two--rev .two__text { order: 1; }
  .two--rev .two__vis { order: 2; }
}
.two__text h2 { font-size: clamp(1.5rem, 3.6vw, 2.15rem); margin-bottom: 16px; max-width: 18ch; }
.two__text p { color: var(--muted); font-size: 1.04rem; margin-top: 14px; max-width: 46ch; }
.two__text b { color: var(--ink); }

/* ============================================================ WALL CHART (problem vis) */
.wallchart {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 24px 26px;
  box-shadow: var(--shadow); transform: rotate(-1.4deg);
  max-width: 380px; margin: 0 auto; position: relative;
}
.wallchart__title {
  font-weight: 800; font-size: 0.82rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--muted); margin-bottom: 14px;
  border-bottom: 1px solid var(--line); padding-bottom: 10px;
}
.wallchart__rows { list-style: none; margin: 0; padding: 0; }
.wallchart__rows li {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 8px 0; border-bottom: 1px dashed var(--line);
  font-size: 0.92rem; color: var(--ink);
}
.wallchart__age { color: var(--muted); font-weight: 700; white-space: nowrap; }
.wallchart__scribble {
  margin-top: 16px; color: var(--st-over); font-weight: 700;
  font-size: 0.95rem; line-height: 1.4; transform: rotate(-3deg);
  text-align: center;
}

/* ============================================================ DEMO TIMELINE (solution) */
.solve__intro { max-width: 62ch; margin-bottom: 34px; }
.solve__intro h2 { font-size: clamp(1.5rem, 3.6vw, 2.2rem); margin-bottom: 14px; }
.solve__lede { color: var(--muted); font-size: 1.06rem; }

.demo {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 24px 20px;
  box-shadow: var(--shadow); max-width: 720px; margin: 0 auto;
}
.demo__dob {
  display: inline-flex; align-items: baseline; gap: 10px;
  background: var(--surface-s); border: 1px solid var(--line);
  border-radius: 999px; padding: 8px 16px; margin-bottom: 22px;
}
.demo__dob-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 700; }
.demo__dob-value { font-weight: 800; font-size: 1.05rem; font-variant-numeric: tabular-nums; }

.tl { list-style: none; margin: 0; padding: 0; position: relative; }
/* the birch trunk rail */
.tl::before {
  content: ""; position: absolute;
  left: 15px; top: 8px; width: 4px; height: calc(100% - 16px);
  border-radius: 2px;
  background: linear-gradient(180deg, var(--rail), var(--rail-dim));
  transform-origin: top;
  transform: scaleY(0);
  transition: transform 0.9s var(--ease);
}
.demo.is-live .tl::before { transform: scaleY(1); }

.tl__dose {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "vaccine date" "age chip";
  gap: 3px 12px;
  align-items: baseline;
  padding: 13px 14px 13px 48px;
  margin: 8px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-s);
  /* start hidden; revealed dose-by-dose */
  opacity: 0; transform: translateY(10px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.demo.is-live .tl__dose {
  opacity: 1; transform: none;
  transition-delay: calc(0.35s + var(--i) * 0.42s);
}
/* lenticel dash tick on the trunk */
.tl__dash {
  position: absolute; left: 6px; top: 18px;
  width: 22px; height: 5px; border-radius: 2px;
  background: var(--dash);
  box-shadow: 0 0 0 3px var(--card);
}
.tl__dose[data-status="done"] .tl__dash { background: var(--st-done); }

.tl__vaccine { grid-area: vaccine; font-weight: 700; font-size: 0.98rem; }
.tl__age { grid-area: age; color: var(--muted); font-size: 0.84rem; }
.tl__date {
  grid-area: date; font-weight: 800; font-variant-numeric: tabular-nums;
  font-size: 0.98rem; text-align: right; white-space: nowrap;
}
.tl__chip {
  grid-area: chip; justify-self: end;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.76rem; font-weight: 700; padding: 3px 10px; border-radius: 999px;
  border: 1px solid;
}
.tl__glyph { font-weight: 900; }
.tl__chip--done { color: var(--st-done); background: var(--st-done-bg); border-color: color-mix(in srgb, var(--st-done) 45%, transparent); }
.tl__chip--due  { color: var(--st-due);  background: var(--st-due-bg);  border-color: color-mix(in srgb, var(--st-due) 45%, transparent); }
.tl__chip--overdue { color: var(--st-over); background: var(--st-over-bg); border-color: color-mix(in srgb, var(--st-over) 45%, transparent); }
.tl__chip--upcoming { color: var(--st-up); background: var(--st-up-bg); border-color: color-mix(in srgb, var(--st-up) 45%, transparent); }

.demo__foot { margin-top: 16px; color: var(--muted); font-size: 0.82rem; }

/* ============================================================ PRIVACY SHIELD */
.shield {
  max-width: 380px; margin: 0 auto; display: grid; gap: 14px;
  justify-items: center; text-align: center;
}
.shield__device {
  width: 100%; background: var(--card); border: 1px solid var(--accent);
  border-radius: var(--radius); padding: 22px 18px; box-shadow: var(--shadow);
  display: grid; gap: 6px;
}
.shield__badge { font-weight: 800; font-size: 1.1rem; color: var(--ink); }
.shield__stays { font-size: 0.86rem; color: var(--accent); font-weight: 700; }
.shield__arrow { position: relative; height: 46px; width: 100%; display: grid; place-items: center; }
.shield__packet {
  position: absolute; top: 4px; width: 14px; height: 14px; border-radius: 3px;
  background: var(--st-up); left: 50%; margin-left: -7px;
  animation: packet 2.6s var(--ease) infinite;
}
.shield__wall {
  position: absolute; top: 20px; width: 68%; height: 4px; border-radius: 2px;
  background: var(--st-over);
}
.shield__blocked {
  position: absolute; top: 26px; font-size: 0.74rem; font-weight: 800;
  color: var(--st-over); text-transform: uppercase; letter-spacing: 0.08em;
  background: var(--st-over-bg); padding: 2px 8px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--st-over) 45%, transparent);
}
@keyframes packet {
  0% { top: 4px; opacity: 1; }
  55% { top: 12px; opacity: 1; }
  70% { top: 12px; opacity: 0.3; transform: scale(0.7); }
  100% { top: 12px; opacity: 0; transform: scale(0.4); }
}
.shield__cloud {
  color: var(--muted); font-size: 0.86rem; font-weight: 600;
  opacity: 0.6; margin-top: 2px;
}
.shield__csp {
  margin-top: 8px; font-size: 0.92rem; font-weight: 700;
}

/* ============================================================ FEATURE CARDS */
.tour__intro { text-align: center; margin-bottom: 40px; }
.tour__intro h2 { font-size: clamp(1.5rem, 3.6vw, 2.15rem); }
.cards {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 22px 24px;
}
.card h3 { font-size: 1.12rem; margin: 14px 0 8px; }
.card p { color: var(--muted); font-size: 0.94rem; }
.card b { color: var(--ink); }
.card__mark { display: flex; align-items: center; gap: 8px; min-height: 34px; }
/* IAP/NIS segmented mark */
.seg {
  font-size: 0.78rem; font-weight: 700; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface-s); color: var(--muted);
}
.seg--on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.card__mark--chips { flex-wrap: wrap; }
/* mini clinic-sheet mark */
.card__mark--sheet { position: relative; gap: 6px; flex-direction: column; align-items: flex-start; }
.sheet-line { display: block; height: 4px; width: 78%; border-radius: 2px; background: var(--rail-dim); }
.sheet-line--short { width: 52%; }
.sheet-check {
  position: absolute; right: 6px; top: 0; width: 20px; height: 20px; border-radius: 5px;
  border: 2px solid var(--st-done); background: var(--st-done-bg);
}
/* offline mark */
.card__mark--offline { align-items: center; }
.offline-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--st-up); box-shadow: 0 0 0 4px var(--st-up-bg); }
.offline-word { font-weight: 800; letter-spacing: 0.02em; color: var(--muted); }

/* ============================================================ CTA BOX */
.ctabox { max-width: 640px; }
.ctabox__mark { width: 60px; height: 60px; margin: 0 auto 18px; display: block; }
.ctabox h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 14px; }
.ctabox__lede { color: var(--muted); font-size: 1.08rem; max-width: 46ch; margin: 0 auto 28px; }
.ctabox__url { margin-top: 16px; color: var(--muted); font-size: 0.86rem; font-variant-numeric: tabular-nums; }

/* ============================================================ FOOTER */
.foot { border-top: 1px solid var(--line); background: var(--surface-s); }
.foot__inner { padding: 28px 22px 44px; }
.foot__disclaimer { color: var(--ink); font-size: 0.88rem; max-width: 82ch; }
.foot__disclaimer strong { color: var(--st-over); }
.foot__meta { margin-top: 16px; color: var(--muted); font-size: 0.82rem; display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.foot__meta a { color: var(--accent); font-weight: 700; text-decoration: none; }
.foot__meta a:hover { text-decoration: underline; }
.foot__dot { margin: 0 6px; }

/* ============================================================ SCROLL REVEAL */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* ============================================================ MOTION — reduced */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
  /* everything must be legible in its final state without any script */
  .reveal { opacity: 1; transform: none; }
  .tl::before { transform: scaleY(1); }
  .tl__dose { opacity: 1; transform: none; }
  .hero__arrow { animation: none; }
  .shield__packet { display: none; }
}

/* No-JS / pre-hydration fallback: if the reveal never fires, still show content.
   app.js adds .js to <html>; without it, force the visible state. */
html:not(.js) .reveal { opacity: 1; transform: none; }
html:not(.js) .tl::before { transform: scaleY(1); }
html:not(.js) .tl__dose { opacity: 1; transform: none; }