/* ============================================
   Health Lab — Sleep Optimization Edition
   Design tokens
   ============================================ */
:root {
  --ink: #10162B;         /* deep night navy — background */
  --ink-2: #1A2140;       /* elevated surface */
  --ink-3: #232C52;       /* border / hairline on dark */
  --moonlight: #F4F1E9;   /* warm off-white — primary text on dark */
  --dusk: #A6ABD4;        /* muted lavender-blue — secondary text/links */
  --candle: #E8A94C;      /* warm amber — primary accent / CTA */
  --candle-dim: #C98F3A;
  --sage: #7FA98A;        /* cool green — data / trust accent */
  --paper: #FBF9F4;       /* light surface for article body */
  --paper-2: #F1EDE2;
  --charcoal: #23273A;    /* body text on light */

  --font-display: 'Fraunces', 'Iowan Old Style', serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --container: 1120px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--moonlight);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16, 22, 43, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ink-3);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--moonlight);
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.logo em {
  font-style: normal;
  color: var(--candle);
}
.logo .subline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dusk);
  margin-left: 2px;
}
.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.93rem;
}
.nav-links a {
  text-decoration: none;
  color: var(--dusk);
  transition: color 0.2s ease;
  margin-right: 32px;
}
.nav-links li:last-child a { margin-right: 0; }
.nav-links a:hover, .nav-links a.active { color: var(--moonlight); }
.nav-cta {
  background: var(--candle);
  color: var(--ink);
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}
.nav-cta:hover { background: #f3ba64; transform: translateY(-1px); }
.nav-toggle { display: none; }

@media (max-width: 760px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--ink);
    border-bottom: 1px solid var(--ink-3);
    flex-direction: column;
    padding: 20px 28px;
    gap: 18px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle {
    display: block;
    background: none;
    border: 1px solid var(--ink-3);
    color: var(--moonlight);
    border-radius: 8px;
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 64px;
  overflow: hidden;
}
.hero .wrap { position: relative; z-index: 2; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sage);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--sage);
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  max-width: 780px;
}
.hero h1 .accent { color: var(--candle); font-style: italic; }
.hero p.lede {
  font-size: 1.15rem;
  color: var(--dusk);
  max-width: 560px;
  margin: 0 0 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn-primary { background: var(--candle); color: var(--ink); }
.btn-primary:hover { background: #f3ba64; transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--ink-3); color: var(--moonlight); }
.btn-ghost:hover { border-color: var(--dusk); transform: translateY(-2px); }

/* Hypnogram signature — the sleep-stage wave that gives the whole site its shape */
.hypnogram {
  width: 100%;
  height: auto;
  display: block;
}
.hypnogram path {
  fill: none;
  stroke: var(--candle);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: draw 2.6s ease forwards 0.2s;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
.hero-graphic { margin-top: 56px; opacity: 0.9; }
.hypnogram-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--dusk);
  letter-spacing: 0.06em;
  margin-top: 10px;
  text-transform: uppercase;
}

@media (prefers-reduced-motion: reduce) {
  .hypnogram path { animation: none; stroke-dashoffset: 0; }
}

/* ---------- Section shell ---------- */
section { padding: 72px 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  margin: 0;
  max-width: 560px;
}
.section-head .desc { color: var(--dusk); max-width: 420px; margin: 0; font-size: 0.95rem; }
.divider {
  border: none;
  border-top: 1px solid var(--ink-3);
  margin: 0;
}

/* ---------- Article cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .grid { grid-template-columns: 1fr; } }

.card {
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-radius: var(--radius);
  padding: 26px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--candle-dim); }
.card .tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage);
}
.card h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.25rem;
  margin: 0;
  line-height: 1.3;
}
.card p { color: var(--dusk); font-size: 0.92rem; margin: 0; flex-grow: 1; }
.card .meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dusk);
  display: flex;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--ink-3);
}

/* ---------- Product recommendation blocks ---------- */
.product-row {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 20px;
  align-items: center;
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 14px;
}
.product-row .rank {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--candle);
  text-align: center;
}
.product-row h4 { margin: 0 0 6px; font-size: 1.05rem; }
.product-row p { margin: 0; color: var(--dusk); font-size: 0.88rem; }
.product-row .score {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--sage);
  margin-top: 6px;
  display: inline-block;
}
@media (max-width: 600px) {
  .product-row { grid-template-columns: 1fr; text-align: left; }
  .product-row .rank { text-align: left; }
}

/* ---------- Disclosure banner ---------- */
.disclosure {
  background: var(--ink-2);
  border: 1px dashed var(--ink-3);
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 0.82rem;
  color: var(--dusk);
  font-family: var(--font-mono);
  line-height: 1.55;
}
.disclosure strong { color: var(--moonlight); }

/* ---------- Newsletter ---------- */
.newsletter {
  background: linear-gradient(135deg, var(--ink-2), var(--ink));
  border: 1px solid var(--ink-3);
  border-radius: 20px;
  padding: 56px;
  text-align: center;
}
.newsletter h2 { font-family: var(--font-display); font-weight: 500; margin: 0 0 12px; font-size: 2rem; }
.newsletter p { color: var(--dusk); max-width: 440px; margin: 0 auto 28px; }
.newsletter form { display: flex; gap: 12px; max-width: 420px; margin: 0 auto; flex-wrap: wrap; justify-content: center; }
.newsletter input {
  flex: 1;
  min-width: 220px;
  padding: 14px 18px;
  border-radius: 999px;
  border: 1px solid var(--ink-3);
  background: var(--ink);
  color: var(--moonlight);
  font-family: var(--font-body);
}
.newsletter input:focus { outline: 2px solid var(--candle); outline-offset: 2px; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--ink-3);
  padding: 48px 0 32px;
  font-size: 0.85rem;
  color: var(--dusk);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-grid h5 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moonlight);
  margin: 0 0 14px;
}
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a { text-decoration: none; color: var(--dusk); }
.footer-grid a:hover { color: var(--moonlight); }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--ink-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================
   Article page (light "paper" surface)
   ============================================ */
.article-hero {
  background: var(--paper);
  color: var(--charcoal);
  padding: 64px 0 40px;
}
.article-hero .wrap { max-width: 760px; }
.article-hero .eyebrow { color: var(--candle-dim); }
.article-hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  color: var(--charcoal);
  margin: 0 0 20px;
}
.article-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #6b6f7f;
  border-top: 1px solid #E1DCCB;
  padding-top: 18px;
  margin-top: 24px;
}
.article-body {
  background: var(--paper);
  color: var(--charcoal);
  padding-bottom: 80px;
}
.article-body .wrap { max-width: 760px; }
.article-body p { font-size: 1.08rem; margin: 0 0 22px; }
.article-body h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.6rem;
  margin: 48px 0 18px;
}
.article-body h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.25rem;
  margin: 32px 0 14px;
}
.article-body ul, .article-body ol { padding-left: 22px; margin: 0 0 22px; font-size: 1.05rem; }
.article-body li { margin-bottom: 8px; }
.pull-quote {
  border-left: 3px solid var(--candle-dim);
  padding: 4px 0 4px 24px;
  margin: 36px 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-style: italic;
  color: #3a3d4d;
}
.callout {
  background: var(--paper-2);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin: 32px 0;
  font-size: 0.95rem;
}
.callout .tag { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--candle-dim); display: block; margin-bottom: 8px; }
.affiliate-box {
  background: var(--ink);
  color: var(--moonlight);
  border-radius: var(--radius);
  padding: 28px;
  margin: 36px 0;
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.affiliate-box .info h4 { margin: 0 0 6px; font-family: var(--font-display); font-size: 1.15rem; }
.affiliate-box .info p { margin: 0; color: var(--dusk); font-size: 0.85rem; max-width: 380px; }
.article-footnote {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #7a7d8c;
  border-top: 1px solid #E1DCCB;
  padding-top: 20px;
  margin-top: 40px;
}