/* Kāyū marketing site. Colours match brand/kayu-assets/theme-tokens.json and the iOS app's Theme.swift:
   forest and cream, light and dark, with one tint per kind of log. */

:root {
  --bg: #F6F1E7;
  --bg-2: #EFE8DA;
  --surface: #FFFFFF;
  --surface-2: #F1ECE2;
  --line: rgba(24, 24, 27, 0.09);
  --text: #18181B;
  --text-2: #52525B;
  --text-3: #71717A;
  --accent: #3F6B4E;
  --accent-hover: #34593F;
  --accent-soft: #E3EDE6;
  --on-accent: #F6F1E7;
  --header: rgba(246, 241, 231, 0.84);
  --glow: rgba(63, 107, 78, 0.16);

  --sleep: #5B6BB5;
  --energy: #3F6B4E;
  --symptoms: #B5675B;
  --meds: #8A5BB5;
  --activities: #C08A2E;
  --water: #3B8FC4;
  --notes: #6B7280;
  --dot-off: #D9D4C8;

  --display: "Avenir Next", "Avenir", "Helvetica Neue", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font: system-ui, -apple-system, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --radius: 22px;
  --radius-sm: 12px;
  --gutter: 20px;
  --max: 1120px;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #18181B;
    --bg-2: #1F1F23;
    --surface: #242427;
    --surface-2: #303034;
    --line: rgba(255, 255, 255, 0.08);
    --text: #F6F1E7;
    --text-2: #B4B4BC;
    --text-3: #8A8A93;
    --accent: #78A487;
    --accent-hover: #8DB89B;
    --accent-soft: #2B3A30;
    --on-accent: #18181B;
    --header: rgba(24, 24, 27, 0.82);
    --glow: rgba(120, 164, 135, 0.16);
    --energy: #4E8460;
    --dot-off: #3F3F46;
  }
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); text-decoration-color: currentColor; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

h1, h2, h3 { font-family: var(--display); line-height: 1.12; letter-spacing: -0.015em; margin: 0 0 0.5em; font-weight: 700; text-wrap: balance; }
h1 { font-size: clamp(2.4rem, 7.5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 5vw, 2.5rem); }
h3 { font-size: 1.2rem; letter-spacing: -0.005em; }
p { margin: 0 0 1em; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 760px; }
.muted { color: var(--text-2); }
.small { font-size: 0.9rem; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: var(--gutter); top: 10px; background: var(--surface); padding: 8px 14px; z-index: 10; }

/* Header */

.site-header {
  position: sticky; top: 0; z-index: 5;
  background: var(--header);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--display); font-weight: 700; font-size: 1.3rem; white-space: nowrap; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand:hover { color: var(--text); }
@media (max-width: 370px) {
  .brand { font-size: 1.15rem; gap: 8px; }
  .brand img { width: 30px; height: 30px; }
  .nav a:not(:last-child) { display: none; }
}

.nav { display: flex; align-items: center; gap: 4px; }
.nav a { color: var(--text-2); text-decoration: none; font-weight: 600; font-size: 0.95rem; padding: 8px 10px; border-radius: 999px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.nav .nav-hide { display: none; }
@media (min-width: 640px) { .nav .nav-hide { display: inline-block; } }

/* Buttons */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 24px; border-radius: 999px;
  font: inherit; font-weight: 700; font-size: 1rem; text-decoration: none;
  border: 0; cursor: pointer; transition: background 0.15s, transform 0.15s;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.btn-ghost { background: var(--surface); color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

/* "Coming soon" App Store button. Swap for Apple's official badge once the app is live. */
.appstore {
  display: inline-flex; align-items: center; gap: 12px;
  min-height: 56px; padding: 8px 22px 8px 16px; border-radius: 16px;
  background: #000; color: #fff; text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.22);
}
.appstore:hover { color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.appstore svg { width: 26px; height: 26px; flex: none; }
.appstore span { display: flex; flex-direction: column; line-height: 1.1; text-align: left; }
.appstore small { font-size: 0.72rem; font-weight: 600; color: #B4B4BC; letter-spacing: 0.02em; }
.appstore strong { font-size: 1.15rem; font-weight: 700; }
.appstore[aria-disabled="true"] { cursor: default; }

/* Energy dots: the app's ten-dot meter, used as a motif. Seven left of ten. */

.dots { display: flex; align-items: center; gap: 5px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); display: block; }
.dots i.off { background: var(--dot-off); }

/* Hero */

.hero { position: relative; overflow: hidden; padding: 48px 0 64px; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto; height: 120%; z-index: -1;
  background:
    radial-gradient(40% 50% at 80% 30%, var(--glow), transparent 70%),
    radial-gradient(35% 40% at 12% 8%, color-mix(in srgb, var(--water) 12%, transparent), transparent 70%);
}
.hero-grid { display: grid; gap: 48px; align-items: center; }
.hero .eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 14px; margin-bottom: 22px; color: var(--text-2); font-weight: 700; }
.hero h1 span { display: block; color: var(--accent); }
.hero .lede { font-size: 1.2rem; color: var(--text-2); max-width: 34em; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-note { margin-top: 14px; font-size: 0.9rem; color: var(--text-3); }

@media (min-width: 900px) {
  .hero { padding: 80px 0 96px; }
  .hero-grid { grid-template-columns: 1.1fr 0.9fr; }
}

/* Phone frame around simulator screenshots */

.phone {
  position: relative; width: min(300px, 78vw); margin: 0 auto;
  aspect-ratio: 1206 / 2622;
  border-radius: 46px; padding: 10px;
  background: linear-gradient(145deg, #3d3d44, #121214);
  box-shadow: 0 40px 80px -24px rgba(24, 24, 27, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}
.phone picture { display: block; width: 100%; height: 100%; }
.phone img { width: 100%; height: 100%; object-fit: cover; border-radius: 37px; }

.hero-phones { position: relative; display: flex; justify-content: center; }
.hero-phones .phone-back { display: none; }
@media (min-width: 560px) {
  .hero-phones .phone-back {
    display: block; position: absolute; width: min(250px, 60vw);
    transform: translate(-58%, 8%) rotate(-7deg); opacity: 0.6; filter: saturate(0.85);
  }
  .hero-phones .phone-front { transform: translateX(14%); }
}

/* Sections */

section { padding: 64px 0; }
.section-head { max-width: 660px; margin-bottom: 36px; }
.section-head p { color: var(--text-2); font-size: 1.1rem; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.alt { background: linear-gradient(180deg, transparent, var(--bg-2) 12%, var(--bg-2) 88%, transparent); }

.features { display: grid; gap: 16px; }
@media (min-width: 640px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .features { grid-template-columns: repeat(3, 1fr); } }

.card { background: var(--surface); border-radius: var(--radius); padding: 24px; border: 1px solid var(--line); }
.card h3 { margin-bottom: 0.35em; }
.card p { color: var(--text-2); margin: 0; }
.icon {
  width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center;
  margin-bottom: 16px; color: #fff; background: var(--tint, var(--accent));
}
.icon svg { width: 24px; height: 24px; }

/* Showcase rows: screenshots beside copy */

.showcase { display: grid; gap: 36px; align-items: center; }
.showcase + .showcase { margin-top: 80px; }
.showcase > * { min-width: 0; }
.showcase .kicker { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--tint, var(--accent)); margin-bottom: 10px; }
.showcase .kicker::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: currentColor; }
.showcase ul { padding: 0; margin: 0 0 1em; list-style: none; }
.showcase li { position: relative; padding-left: 28px; margin-bottom: 10px; color: var(--text-2); }
.showcase li::before { content: ""; position: absolute; left: 0; top: 0.45em; width: 12px; height: 12px; border-radius: 4px; background: var(--tint, var(--accent)); opacity: 0.85; }
.showcase li strong { color: var(--text); }
@media (min-width: 860px) {
  .showcase { grid-template-columns: 1fr 1fr; gap: 64px; }
  .showcase.flip .showcase-media { order: 2; }
}

/* Two phones side by side */

.phone-pair { display: flex; justify-content: center; gap: 4%; }
.phone-pair .phone { width: 48%; max-width: 260px; margin: 0; border-radius: clamp(26px, 7vw, 42px); padding: clamp(6px, 1.6vw, 9px); }
.phone-pair .phone img { border-radius: clamp(20px, 5.6vw, 34px); }
.phone-pair .phone:nth-child(2) { transform: translateY(8%); }

/* The Kayu day */

.day { display: grid; gap: 28px; align-items: center; }
@media (min-width: 860px) { .day { grid-template-columns: 1fr 1fr; gap: 64px; } }
.clock {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
}
.timeline { position: relative; height: 54px; border-radius: 14px; overflow: hidden; display: flex; }
.timeline span { display: block; height: 100%; }
.timeline .night { background: color-mix(in srgb, var(--sleep) 30%, var(--surface)); flex: 6; }
.timeline .daytime { background: color-mix(in srgb, var(--accent) 22%, var(--surface)); flex: 18; }
.timeline-labels { display: flex; justify-content: space-between; margin-top: 8px; font-size: 0.85rem; color: var(--text-3); font-variant-numeric: tabular-nums; }
.clock p { margin: 16px 0 0; color: var(--text-2); font-size: 0.95rem; }

/* Web callout */

.web {
  display: grid; gap: 24px; align-items: center;
  background: var(--surface); border: 1px solid var(--line); border-radius: 28px; padding: 32px 24px;
}
.web p { color: var(--text-2); margin: 0; }
@media (min-width: 860px) { .web { grid-template-columns: 1fr auto; padding: 36px 40px; } }

/* CTA */

.cta {
  text-align: center; border-radius: 32px; padding: 48px 24px;
  background:
    radial-gradient(60% 80% at 50% 0%, var(--glow), transparent 70%),
    var(--surface);
  border: 1px solid var(--line);
}
.cta img { width: 96px; height: 96px; border-radius: 22px; margin: 0 auto 20px; box-shadow: 0 16px 40px -12px rgba(24, 24, 27, 0.4); }
.cta p { color: var(--text-2); max-width: 32em; margin: 0 auto 26px; }
.cta .dots { justify-content: center; margin-bottom: 18px; }

/* Long-form pages (privacy, terms, support) */

.page-head { padding: 48px 0 8px; }
.page-head p { color: var(--text-2); font-size: 1.1rem; }
.prose { padding: 16px 0 72px; }
.prose h2 { font-size: 1.55rem; margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }
.prose p, .prose li { color: var(--text-2); }
.prose strong { color: var(--text); }
.prose ul { padding-left: 1.2em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.45em; }
.prose .summary { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; margin: 8px 0 24px; }
.prose .summary ul { margin: 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.2em; font-size: 0.95rem; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.prose th { color: var(--text); }
.prose td { color: var(--text-2); }
.table-scroll { overflow-x: auto; }

details.faq { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; }
details.faq summary { cursor: pointer; padding: 16px 48px 16px 18px; font-weight: 700; color: var(--text); list-style: none; position: relative; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font-size: 1.4rem; color: var(--text-3); }
details.faq[open] summary::after { content: "–"; }
details.faq > div { padding: 0 18px 4px; }

.contact-card { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.contact-card p { margin: 0; }

/* Footer */

.site-footer { border-top: 1px solid var(--line); padding: 36px 0 48px; color: var(--text-3); font-size: 0.92rem; }
.site-footer .wrap { display: grid; gap: 20px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.site-footer a { color: var(--text-2); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.site-footer p { margin: 0; }
@media (min-width: 760px) {
  .site-footer .wrap { grid-template-columns: 1fr auto; align-items: center; }
}