/* =========================================================
   Live Better Science — Deck for Dr. Rimm
   Cool-blue monochrome editorial system
   ========================================================= */

:root {
  --white: #ffffff;
  --off-white: #f5f9fd;
  --blue-tint: #e8f1f8;
  --blue-light: #c8ddf0;
  --blue-baby: #9ac4e0;
  --blue-mid: #6a9ec2;
  --blue-deep: #3a6f94;
  --blue-dark: #1e3a52;
  --ink: #1a2a3a;
  --ink-light: #4a6275;
  --ink-muted: #7a9aaf;
  --rule: #c4d8e8;

  --font-display: 'Libre Baskerville', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --slide-pad-x: 4rem;
  --slide-pad-y: 3rem;
  --slide-max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  background: var(--off-white);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  scroll-snap-type: y mandatory;
  overflow-y: scroll;
}

/* ---------- Slide container ---------- */

.slide {
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: var(--slide-pad-y) var(--slide-pad-x);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  background: var(--off-white);
}

.slide-inner {
  max-width: var(--slide-max);
  margin: 0 auto;
  width: 100%;
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 4rem 3.5rem 3rem;
  position: relative;
}

.slide-inner::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 80px; height: 3px;
  background: var(--blue-deep);
}

.slide--dark .slide-inner {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  color: var(--white);
}
.slide--dark .slide-inner::before {
  background: var(--blue-baby);
  width: 120px;
  height: 4px;
}

/* Subtle radial atmosphere on dark slides */
.slide--dark .slide-inner {
  background-image:
    radial-gradient(circle at 80% 30%, rgba(154, 196, 224, 0.12), transparent 55%),
    radial-gradient(circle at 20% 80%, rgba(200, 221, 240, 0.08), transparent 50%),
    linear-gradient(var(--blue-dark), var(--blue-dark));
}

/* ---------- Slide chrome ---------- */

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--blue-deep);
  margin-bottom: 0.85rem;
}
.slide--dark .eyebrow { color: var(--blue-baby); }

h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 2.5rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 1rem;
}
.slide--dark h1 { color: var(--white); }
h1 em {
  font-style: italic;
  color: var(--blue-deep);
}
.slide--dark h1 em { color: var(--blue-baby); }

h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.5rem;
  margin-bottom: 0.6rem;
}
.slide--dark h2 { color: var(--white); }

h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--ink);
  margin-bottom: 0.45rem;
}
.slide--dark h3 { color: var(--white); }

.deck-lead {
  color: var(--ink-light);
  font-size: 1.02rem;
  max-width: 760px;
  margin-bottom: 2.25rem;
}
.slide--dark .deck-lead {
  color: var(--blue-light);
}

.pullquote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--ink);
  line-height: 1.45;
  max-width: 760px;
  border-left: 2px solid var(--blue-deep);
  padding: 0.4rem 0 0.4rem 1.1rem;
  margin-top: 1.25rem;
}
.slide--dark .pullquote {
  color: var(--blue-light);
  border-left-color: var(--blue-baby);
}

.slide-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.slide--dark .slide-footer {
  border-top-color: rgba(200, 221, 240, 0.25);
  color: var(--blue-baby);
}
.slide-footer .brand-mark {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--blue-dark);
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.82rem;
}
.slide--dark .slide-footer .brand-mark {
  color: var(--blue-light);
}

/* ---------- Reusable blocks ---------- */

.card-grid {
  display: grid;
  gap: 1.1rem;
}
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--2 { grid-template-columns: 1fr 1fr; }
.card-grid--wide-left { grid-template-columns: 1fr 1.3fr; }
.card-grid--wide-right { grid-template-columns: 1.3fr 1fr; }

.card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--blue-deep);
  padding: 1.35rem 1.1rem 1.25rem;
}
.card-num {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-bottom: 0.45rem;
}
.card h3 { font-size: 1.25rem; margin-bottom: 0.55rem; }
.card p { font-size: 0.86rem; color: var(--ink-light); line-height: 1.55; }

.chip {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--blue-tint);
  color: var(--blue-deep);
  border: 1px solid var(--blue-light);
  margin: 0.15rem 0.22rem 0.15rem 0;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  font-family: var(--font-mono);
  white-space: nowrap;
}
.chip--solid {
  background: var(--blue-deep);
  color: var(--white);
  border-color: var(--blue-deep);
}
.chip--hot {
  background: var(--blue-deep);
  color: var(--white);
  border-color: var(--blue-deep);
  font-weight: 500;
}
.chip--ghost {
  background: transparent;
  color: var(--ink-muted);
  border-color: var(--rule);
}
.slide--dark .chip {
  background: rgba(255,255,255,0.1);
  color: var(--blue-light);
  border-color: rgba(255,255,255,0.25);
}
.slide--dark .chip--solid {
  background: var(--blue-baby);
  color: var(--blue-dark);
  border-color: var(--blue-baby);
}

.callout {
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--blue-deep);
  background: var(--blue-tint);
  font-size: 0.88rem;
  color: var(--ink);
  margin-top: 1.1rem;
}
.callout b {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  color: var(--blue-dark);
}

.label-small {
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--blue-deep);
  margin-bottom: 0.4rem;
  font-weight: 500;
}
.slide--dark .label-small { color: var(--blue-baby); }

.mono { font-family: var(--font-mono); font-size: 0.9em; }

ul.clean {
  list-style: none;
  padding: 0;
}
ul.clean li {
  padding: 0.4rem 0 0.4rem 1.25rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--ink-light);
  border-bottom: 1px dashed var(--rule);
}
ul.clean li:last-child { border-bottom: none; }
ul.clean li::before {
  content: '·';
  position: absolute;
  left: 0.35rem;
  color: var(--blue-deep);
  font-weight: bold;
}
.slide--dark ul.clean li {
  color: var(--blue-light);
  border-bottom-color: rgba(200, 221, 240, 0.2);
}
.slide--dark ul.clean li::before { color: var(--blue-baby); }

/* ---------- Navigation UI ---------- */

#nav-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--blue-deep);
  width: 0;
  z-index: 200;
  transition: width 0.15s ease-out;
}

#nav-counter {
  position: fixed;
  bottom: 1.5rem;
  right: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--ink-muted);
  background: var(--white);
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--rule);
  z-index: 150;
  text-transform: uppercase;
}

#nav-hint {
  position: fixed;
  bottom: 1.5rem;
  left: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--ink-muted);
  z-index: 150;
  text-transform: uppercase;
  opacity: 0.85;
}

/* ---------- Print / PDF ---------- */

@media print {
  @page {
    size: 13.33in 7.5in;  /* 16:9 landscape */
    margin: 0;
  }
  html, body {
    background: var(--white);
    scroll-snap-type: none;
    overflow: visible;
  }
  .slide {
    min-height: 7.5in;
    height: 7.5in;
    width: 13.33in;
    padding: 0.3in;
    page-break-after: always;
    break-after: page;
    display: block;
  }
  .slide-inner {
    height: 100%;
    max-width: none;
    margin: 0;
    border-width: 1px;
    padding: 1rem 1.5rem;
  }
  #nav-progress, #nav-counter, #nav-hint { display: none; }
}