/* Your Habit Streaks marketing site.
   Near-monochrome, OLED-dark, Threads-inspired. Flat: hairlines, no shadows. */

/* Smooth cross-document navigation (Chromium). Falls back to instant nav. */
@view-transition {
  navigation: auto;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) {
    animation: none !important;
  }
}

:root {
  --bg: #000000;
  --surface: #161616;
  --separator: #262626;
  --text: #f3f5f7;
  --text-secondary: #7a7a7a;
  --card-border: rgba(255, 255, 255, 0.1);
  --maxw: 960px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Nav ---------------------------------------------------------------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav__mark {
  display: inline-flex;
  width: 20px;
  height: 20px;
}

.nav__mark svg,
.hero__mark svg {
  width: 100%;
  height: 100%;
}

.nav__links {
  display: flex;
  gap: 22px;
  font-size: 15px;
}

.nav__links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.nav__links a:hover,
.nav__links a.is-active {
  color: var(--text);
}

.nav__links a.is-active {
  font-weight: 600;
}

/* ---- Hero --------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 56px;
  padding: 64px 0 88px;
}

.hero__mark {
  width: 52px;
  height: 52px;
  color: var(--text);
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(36px, 5.5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}

.hero__tagline {
  font-size: clamp(18px, 2.4vw, 21px);
  color: var(--text-secondary);
  max-width: 30ch;
  margin: 0 0 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  text-decoration: none;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--text);
  color: #000;
  transition: opacity 0.12s ease;
}

.badge:hover {
  opacity: 0.9;
}

.badge--soon {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
  cursor: default;
}

.badge--soon:hover {
  opacity: 1;
}

/* ---- Phone frame (flat, hairline rim, no shadow) ------------------------ */
.phone {
  flex: 0 0 auto;
  width: 280px;
  padding: 10px;
  background: var(--bg);
  border: 1px solid var(--card-border);
  border-radius: 52px;
}

.phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 42px;
}

/* ---- Features (quiet rows, no cards) ------------------------------------ */
.features {
  padding: 8px 0 72px;
}

.features ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--separator);
  border: 1px solid var(--separator);
  border-radius: 16px;
  overflow: hidden;
}

.features li {
  background: var(--bg);
  padding: 24px;
}

.features h3 {
  font-size: 17px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.features p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

/* ---- Privacy ------------------------------------------------------------ */
.privacy {
  text-align: center;
  padding: 32px 24px 96px;
  max-width: 640px;
  margin: 0 auto;
}

.privacy p {
  color: var(--text-secondary);
  font-size: 19px;
  line-height: 1.5;
  margin: 0;
}

/* ---- Prose (terms / changelog) ------------------------------------------ */
.prose {
  max-width: 680px;
  margin: 40px auto 88px;
}

.prose h1 {
  font-size: clamp(28px, 5vw, 38px);
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.prose h2 {
  font-size: 23px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

.prose h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}

.prose p,
.prose li {
  color: var(--text-secondary);
}

.prose strong {
  color: var(--text);
}

.prose em {
  font-style: normal;
  font-size: 14px;
}

.prose a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose ul {
  padding-left: 20px;
}

.prose li {
  margin: 8px 0;
}

/* ---- Changelog ---------------------------------------------------------- */
.prose .lead {
  color: var(--text-secondary);
  margin: 0 0 40px;
}

.release {
  border-top: 1px solid var(--separator);
  padding-top: 28px;
  margin-top: 28px;
}

.release:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.release h2 {
  font-size: 21px;
  margin: 0 0 4px;
}

.release__summary {
  color: var(--text);
  margin: 0 0 12px;
}

.release ul {
  padding-left: 20px;
  margin: 0;
}

.release li {
  color: var(--text-secondary);
  margin: 8px 0;
}

/* ---- Footer ------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--separator);
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 36px 24px 56px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

.footer p {
  margin: 0;
  color: #555;
}

/* ---- Responsive --------------------------------------------------------- */
/* Narrow screens: stack the nav links below the title instead of wrapping. */
@media (max-width: 560px) {
  .nav {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .nav__links {
    justify-content: flex-end;
  }
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 48px;
    padding: 40px 0 64px;
  }
  .hero__mark {
    margin-left: auto;
    margin-right: auto;
  }
  .hero__tagline {
    max-width: 34ch;
  }
  .features ul {
    grid-template-columns: 1fr;
  }
}