/* ================================================================
   COLLEGE SLEEP SCORE — Site Stylesheet
   Design system inherited from index.html (the quiz home page).
   ================================================================ */

:root {
  /* Color palette — matches the quiz home page */
  --bg: #F7F4ED;
  --bg-card: #FFFFFF;
  --text: #1B2A33;
  --text-muted: #5B6E78;
  --text-soft: #8A99A0;
  --accent: #3E5E6E;
  --accent-hover: #2C4955;
  --accent-soft: #E8EFF1;
  --accent-warm: #C97B5F;
  --accent-warm-soft: #FBF1ED;
  --border: rgba(27, 42, 51, 0.08);
  --border-strong: rgba(27, 42, 51, 0.18);

  /* Typography */
  --font-display: 'Fraunces', 'Times New Roman', Georgia, serif;
  --font-body: 'Manrope', system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Spacing & radius */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --radius: 10px;
  --radius-lg: 18px;
  --max-content: 680px;
  --max-wide: 1080px;
}

/* ----------------------------------------------------------------
   Reset & base
   ---------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
  min-height: 100vh;
}

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

a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; transition: color 0.15s ease; }
a:hover { color: var(--accent-warm); }

::selection { background: var(--accent-warm); color: var(--bg); }

/* ----------------------------------------------------------------
   Typography
   ---------------------------------------------------------------- */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-variation-settings: "opsz" 96;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-5);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-variation-settings: "opsz" 36;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  letter-spacing: -0.018em;
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  font-variation-settings: "opsz" 14;
  font-weight: 500;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

p { margin-top: 0; margin-bottom: var(--space-4); }
strong { font-weight: 600; color: var(--text); }
em { font-style: italic; }

/* ----------------------------------------------------------------
   Site header (matches index.html exactly so pillar pages render
   the same header without inlining CSS)
   ---------------------------------------------------------------- */

.header {
  position: sticky;
  top: 0;
  background: rgba(247, 244, 237, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
  padding: 14px 24px 12px;
}

.header-row {
  max-width: var(--max-content);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: -0.015em;
  color: var(--text);
  font-style: italic;
  text-decoration: none;
}
.brand strong { font-weight: 500; font-style: normal; }
.brand:hover { color: var(--accent); }

.brand sup {
  font-size: 0.55em;
  vertical-align: super;
  margin-left: 1px;
  font-weight: 500;
}

/* ----------------------------------------------------------------
   Hamburger button + drawer (identical to index.html)
   ---------------------------------------------------------------- */

.hamburger {
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 0;
  cursor: pointer;
  transition: border-color 160ms, background-color 160ms;
  flex-shrink: 0;
}
.hamburger:hover { border-color: var(--accent); background: var(--accent-soft); }
.hamburger:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.hamburger__line {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  transition: transform 240ms ease, opacity 200ms ease;
}
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-overlay {
  position: fixed; inset: 0;
  background: rgba(27, 42, 51, 0.4);
  z-index: 100;
  opacity: 0; visibility: hidden;
  transition: opacity 240ms ease, visibility 240ms ease;
}
.nav-overlay[aria-hidden="false"] { opacity: 1; visibility: visible; }

.nav-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(360px, 86vw);
  background: var(--bg);
  z-index: 110;
  transform: translateX(100%);
  transition: transform 320ms cubic-bezier(0.4, 0, 0.2, 1);
  display: flex; flex-direction: column;
  box-shadow: -8px 0 32px rgba(27, 42, 51, 0.16);
}
.nav-drawer[aria-hidden="false"] { transform: translateX(0); }

.nav-drawer__header {
  padding: 18px 22px;
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--border);
}
.nav-drawer__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  font-weight: 600;
}
.nav-drawer__close {
  background: none; border: none; cursor: pointer;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--text);
  border-radius: 6px;
  transition: background-color 160ms;
}
.nav-drawer__close:hover { background: var(--accent-soft); }

.nav-drawer__list { list-style: none; margin: 0; padding: 12px 0; flex: 1; overflow-y: auto; }
.nav-drawer__item { margin: 0; }
.nav-drawer__link {
  display: block;
  padding: 14px 22px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: -0.012em;
  color: var(--text);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background-color 160ms, border-color 160ms, color 160ms, padding-left 200ms;
}
.nav-drawer__link:hover {
  background: var(--accent-soft);
  border-left-color: var(--accent-warm);
  color: var(--accent);
  padding-left: 26px;
}
.nav-drawer__link[aria-current="page"] {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}
.nav-drawer__footer { padding: 18px 22px; border-top: 1px solid var(--border); }
.nav-drawer__cta {
  display: block; text-align: center;
  background: var(--accent);
  color: var(--bg);
  padding: 12px 16px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14.5px;
  text-decoration: none;
  transition: background-color 160ms;
}
.nav-drawer__cta:hover { background: var(--accent-hover); color: var(--bg); }
body.drawer-open { overflow: hidden; }

/* ----------------------------------------------------------------
   Article layout
   ---------------------------------------------------------------- */

.article {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article__meta {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-soft);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.article__meta::before {
  content: "—";
  margin-right: var(--space-2);
  color: var(--accent-warm);
}

.article__lede {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--text);
  margin-bottom: var(--space-6);
  font-family: var(--font-display);
  font-variation-settings: "opsz" 14, "wght" 350;
  letter-spacing: -0.005em;
}

.article p { margin-bottom: var(--space-4); }
.article ul, .article ol { margin-bottom: var(--space-5); padding-left: var(--space-5); }
.article li { margin-bottom: var(--space-2); }

/* ----------------------------------------------------------------
   Did You Know callout
   ---------------------------------------------------------------- */

.article blockquote {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: var(--space-5);
  margin: var(--space-6) 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.article blockquote > p:first-child {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.article blockquote > p { margin-bottom: var(--space-3); color: var(--text); }
.article blockquote > p:last-child { margin-bottom: 0; }

.article blockquote em {
  font-size: 13.5px;
  color: var(--text-muted);
  display: block;
  margin-top: var(--space-3);
  font-style: italic;
}

/* ----------------------------------------------------------------
   Tables
   ---------------------------------------------------------------- */

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-5) 0 var(--space-6);
  font-size: 14.5px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.article thead th {
  background: var(--accent-soft);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-strong);
  font-size: 13.5px;
  letter-spacing: 0.01em;
}

.article tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.article tbody tr:nth-child(even) td { background: rgba(247, 244, 237, 0.5); }
.article tbody tr:last-child td { border-bottom: none; }

/* ----------------------------------------------------------------
   CTA blocks
   ---------------------------------------------------------------- */

.article .cta-block {
  background: var(--text);
  color: var(--bg);
  padding: var(--space-7);
  margin: var(--space-7) 0;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.article .cta-block::before {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 220px; height: 220px;
  background: radial-gradient(circle, var(--accent-warm) 0%, transparent 70%);
  opacity: 0.2;
  transform: translate(70px, -70px);
  pointer-events: none;
}

.article .cta-block h2 {
  color: var(--bg);
  margin-top: 0;
  font-size: clamp(1.5rem, 2.5vw, 1.75rem);
}

.article .cta-block p { color: rgba(247, 244, 237, 0.88); }
.article .cta-block ul { color: rgba(247, 244, 237, 0.88); }
.article .cta-block strong { color: var(--bg); }
.article .cta-block a { color: var(--bg); }

.cta-link {
  display: inline-block;
  background: var(--accent-warm);
  color: var(--bg) !important;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  margin-top: var(--space-3);
  transition: transform 160ms ease, background-color 160ms ease;
  font-size: 15px;
  font-family: var(--font-body);
}

.cta-link:hover {
  background: #B66C50;
  color: var(--bg) !important;
  transform: translateY(-1px);
}

/* Inline CTA — for mid-article callouts (e.g. calculator link inside a pillar) */
.inline-cta {
  margin: var(--space-6) 0;
  padding: 22px 24px;
  background: var(--accent-warm-soft);
  border: 1px solid rgba(201, 123, 95, 0.18);
  border-radius: var(--radius-lg);
  text-align: center;
}
.inline-cta__lead {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.inline-cta .cta-link { margin-top: 0; }
@media (max-width: 600px) {
  .inline-cta { padding: 20px 18px; }
  .inline-cta__lead { font-size: 16px; }
}

/* ----------------------------------------------------------------
   Sources & related reading
   ---------------------------------------------------------------- */

.article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-7) 0;
}

.article hr + p,
.article hr ~ p {
  font-size: 14.5px;
  color: var(--text-muted);
}

.article hr + p em,
.article hr ~ p em {
  font-style: normal;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text);
  font-weight: 600;
  display: block;
  margin-bottom: var(--space-2);
}

.future-link { color: var(--text-soft); font-style: italic; }

/* ----------------------------------------------------------------
   About page
   ---------------------------------------------------------------- */

.about-page {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.about-page h1 { margin-bottom: var(--space-6); }
.about-page p { font-size: 1.1rem; line-height: 1.7; color: var(--text-muted); }

/* ----------------------------------------------------------------
   Footer
   ---------------------------------------------------------------- */

.site-footer {
  text-align: center;
  padding: 16px 24px 32px;
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.02em;
  background: var(--bg);
}

.site-footer__nav { margin-bottom: 14px; }
.site-footer__nav a { color: var(--text-muted); text-decoration: none; margin: 0 6px; }
.site-footer__nav a:hover { color: var(--accent); }
.site-footer__divider { color: var(--text-soft); margin: 0 4px; }
.site-footer__copy { font-size: 12px; }

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .article { padding: 40px 20px 64px; }
  .article .cta-block { padding: var(--space-5); }
  .article table { font-size: 13.5px; }
  .article thead th, .article tbody td { padding: 10px 12px; }
}

@media print {
  .header, .nav-drawer, .nav-overlay, .site-footer { display: none; }
  body { background: white; color: black; }
  .article { max-width: 100%; padding: 0; }
  a { color: black; text-decoration: underline; }
}