/* Allergy Tracker marketing site
   Monochrome graphite system, matching the app's own design language:
   off-white / graphite in light mode, near-black / soft white in dark mode. */

:root {
  --bg: #faf9f7;
  --surface: #ffffff;
  --surface-border: #e7e5e1;
  --ink: #1c1c1e;
  --ink-secondary: #5b5b60;
  --ink-tertiary: #86868b;
  --divider: #e4e4e4;
  --accent-fill: #1c1c1e;
  --accent-fill-ink: #ffffff;
  --focus-ring: #0a84ff;
  --radius: 14px;
  --radius-sm: 8px;
  --max: 760px;
  --max-wide: 1040px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0c;
    --surface: #17171a;
    --surface-border: #2c2c2e;
    --ink: #f5f5f7;
    --ink-secondary: #a1a1a6;
    --ink-tertiary: #8e8e93;
    --divider: #2c2c2e;
    --accent-fill: #f5f5f7;
    --accent-fill-ink: #1c1c1e;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.wrap {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 20px;
}

.prose {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--accent-fill);
  color: var(--accent-fill-ink);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 100;
}

.skip-link:focus {
  left: 20px;
  top: 12px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--divider);
  padding: 18px 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand .mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--accent-fill);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 2px;
  padding: 5px 5px 4px;
  flex: none;
}

.brand .mark span {
  display: block;
  width: 3px;
  background: var(--accent-fill-ink);
  border-radius: 1px;
}

.brand .mark span:nth-child(1) { height: 30%; }
.brand .mark span:nth-child(2) { height: 50%; }
.brand .mark span:nth-child(3) { height: 70%; }
.brand .mark span:nth-child(4) { height: 100%; }

.site-nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover {
  color: var(--ink);
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 13px 24px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1;
}

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

.btn-primary:hover {
  opacity: 0.88;
}

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--divider);
}

.btn-quiet:hover {
  border-color: var(--ink-secondary);
}

.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

/* Hero */
.hero {
  padding: 76px 0 56px;
}

.hero .prose {
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 4.4vw, 2.85rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  font-weight: 700;
}

.hero p.lede {
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-secondary);
  margin: 0 auto 32px;
  max-width: 560px;
}

.hero .cta-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero .cta-caption {
  font-size: 13px;
  color: var(--ink-tertiary);
}

.trust-line {
  margin: 28px auto 0;
  max-width: 520px;
  font-size: 14px;
  color: var(--ink-tertiary);
  line-height: 1.6;
}

/* Sections */
section {
  padding: 56px 0;
}

section.alt {
  background: var(--surface);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
}

.section-head {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 40px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.015em;
  margin: 0 0 12px;
  font-weight: 700;
}

.section-head p {
  color: var(--ink-secondary);
  font-size: 17px;
  margin: 0;
}

.eyebrow {
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-tertiary);
  margin: 0 0 10px;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 20px;
}

.step {
  text-align: left;
}

.step .num {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--divider);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 16px;
  color: var(--ink-secondary);
}

.step h3 {
  font-size: 18px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.step p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 15.5px;
}

/* Feature cards */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  font-size: 16px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

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

/* Two-column feature/privacy blocks */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 20px;
}

.split h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.split p {
  color: var(--ink-secondary);
  font-size: 16.5px;
  margin: 0 0 14px;
}

.split .panel {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 28px;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.check-list li {
  display: flex;
  gap: 10px;
  padding: 7px 0;
  color: var(--ink-secondary);
  font-size: 15.5px;
}

.check-list li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--ink-tertiary);
  margin-top: 9px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--divider);
  padding-bottom: 1px;
}

.text-link:hover {
  border-bottom-color: var(--ink);
}

/* Final CTA */
.final-cta {
  text-align: center;
  padding: 70px 0 80px;
}

.final-cta h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.final-cta p {
  color: var(--ink-secondary);
  max-width: 460px;
  margin: 0 auto 28px;
}

/* Medical note strip */
.medical-note {
  border-top: 1px solid var(--divider);
  padding: 22px 0;
}

.medical-note p {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-tertiary);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--divider);
  padding: 32px 0;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: var(--ink-tertiary);
}

.site-footer nav {
  display: flex;
  gap: 18px;
}

.site-footer a {
  text-decoration: none;
  color: var(--ink-tertiary);
}

.site-footer a:hover {
  color: var(--ink);
}

/* Legal / long-form content pages */
.legal-header {
  padding: 56px 0 20px;
}

.legal-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.legal-header .updated {
  color: var(--ink-tertiary);
  font-size: 14px;
}

.legal-body {
  padding: 8px 0 72px;
}

.legal-body h2 {
  font-size: 19px;
  letter-spacing: -0.01em;
  margin: 36px 0 10px;
}

.legal-body h2:first-child {
  margin-top: 0;
}

.legal-body p {
  color: var(--ink-secondary);
  margin: 0 0 14px;
  font-size: 16px;
}

.legal-body ul {
  color: var(--ink-secondary);
  font-size: 16px;
  margin: 0 0 14px;
  padding-left: 22px;
}

.legal-body li {
  margin: 4px 0;
}

.legal-body strong {
  color: var(--ink);
}

.legal-body a {
  color: var(--ink);
}

.callout {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0 0 24px;
  font-size: 15px;
  color: var(--ink-secondary);
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--divider);
  padding: 22px 0;
}

.faq-item:first-child {
  border-top: 1px solid var(--divider);
}

.faq-item h2 {
  font-size: 17px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.faq-item p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 16px;
}

.contact-panel {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 26px;
  margin: 0 0 40px;
}

.contact-panel h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.contact-panel p {
  margin: 0 0 14px;
  color: var(--ink-secondary);
}

/* Responsive */
@media (max-width: 820px) {
  .steps,
  .grid {
    grid-template-columns: 1fr;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 560px) {
  .hero {
    padding: 52px 0 40px;
  }

  section {
    padding: 44px 0;
  }

  .site-header {
    padding: 14px 0;
  }

  .site-footer .wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}

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