/* css/base.css — reset, layout primitives, universal selectors */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html, body { height: 100%; }
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-body);
  font-size: var(--font-size-body, 1rem);
  line-height: var(--line-height-body, 1.55);
  transition: background 240ms ease, color 240ms ease;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
a { color: inherit; text-decoration: none; }
button { background: none; border: 0; cursor: pointer; padding: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Layout primitives */

[data-layout="L1"] main { max-width: 64ch; margin: 0 auto; padding: 0 1.5rem; }
[data-layout="L1"] section.section { padding: 6rem 0; }
[data-layout="L1"] .hero-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 2rem; }

[data-layout="L2"] main { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
[data-layout="L2"] section.section { padding: 5rem 0; display: grid; grid-template-columns: 2fr 1fr; gap: 3rem; align-items: start; }
[data-layout="L2"] .hero-inner { display: grid; grid-template-columns: 2fr 1fr; gap: 3rem; align-items: center; padding-top: 6rem; }
@media (max-width: 760px) {
  [data-layout="L2"] section.section,
  [data-layout="L2"] .hero-inner { grid-template-columns: 1fr; gap: 2rem; }
}

[data-layout="L3"] main { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
[data-layout="L3"] section.section { padding: 5rem 0; display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.25rem; }
[data-layout="L3"] section.section > * { grid-column: span 12; }
[data-layout="L3"] .hero-inner { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.25rem; align-items: end; padding-top: 6rem; }
[data-layout="L3"] .hero-text { grid-column: 1 / span 7; }
[data-layout="L3"] .hero-portrait { grid-column: 8 / span 5; }
@media (max-width: 760px) {
  [data-layout="L3"] section.section { grid-template-columns: 1fr; }
  [data-layout="L3"] section.section > * { grid-column: 1; }
  [data-layout="L3"] .hero-inner { grid-template-columns: 1fr; }
  [data-layout="L3"] .hero-text, [data-layout="L3"] .hero-portrait { grid-column: 1; }
}

[data-layout="L4"] .hero-section { position: relative; min-height: 100vh; overflow: hidden; }
[data-layout="L4"] .hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
[data-layout="L4"] .hero-inner { position: relative; z-index: 1; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; padding: 6rem 1.5rem 3rem; max-width: 1280px; margin: 0 auto; gap: 2rem; }
[data-layout="L4"] section.section { padding: 5rem 1.5rem; max-width: 1100px; margin: 0 auto; }
[data-layout="L4"] .hero-portrait { max-width: 320px; }

/* Universal nav */
.nav-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--nav-bg, transparent);
  backdrop-filter: var(--nav-backdrop, none);
  -webkit-backdrop-filter: var(--nav-backdrop, none);
  transition: background 240ms ease;
}
.nav-brand { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; letter-spacing: var(--nav-brand-tracking, 0.08em); }
.nav-links { display: flex; gap: 1.4rem; align-items: center; }
.nav-links a { font-family: var(--font-body); font-size: 0.92rem; opacity: 0.92; }
.nav-links a:hover { opacity: 1; }
.nav-toggle { font-size: 1rem; padding: 0.4rem 0.7rem; border-radius: var(--btn-radius, 999px); border: 1px solid currentColor; background: transparent; color: currentColor; }
@media (max-width: 720px) {
  .nav-links { gap: 0.9rem; font-size: 0.85rem; }
  .nav-bar { padding: 0.7rem 1rem; }
}

/* Quick-links bar */
.quick-links { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.quick-links a {
  font-family: var(--font-body);
  font-size: 0.92rem;
  padding: 0.55rem 1rem;
  border: 1px solid currentColor;
  border-radius: var(--btn-radius, 999px);
  background: transparent;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}
.quick-links a:hover { background: var(--color-fg); color: var(--color-bg); }

/* Face-tracker frame */
.face-frame {
  width: var(--face-size, 200px);
  height: var(--face-size, 200px);
  position: relative;
  overflow: hidden;
}
.face-frame img { width: 100%; height: 100%; object-fit: cover; transition: opacity 220ms ease; }

/* Section heading */
.section-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  letter-spacing: var(--heading-tracking, 0);
  margin-bottom: 1.25rem;
  color: var(--color-heading, var(--color-fg));
}

/* Card */
.card {
  padding: 1.25rem 1.4rem;
  background: var(--card-bg, transparent);
  border: var(--card-border, 1px solid currentColor);
  border-radius: var(--card-radius, 0);
  box-shadow: var(--card-shadow, none);
  margin-bottom: 1rem;
}

/* Footer */
.site-footer {
  padding: 2rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
  opacity: 0.7;
  border-top: 1px solid currentColor;
  margin-top: 4rem;
}

/* Theme picker overlay */
.theme-picker-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.55);
  display: none;
  align-items: center; justify-content: center;
}
.theme-picker-overlay[data-open="true"] { display: flex; }
.theme-picker {
  background: var(--color-bg);
  color: var(--color-fg);
  border: 1px solid currentColor;
  padding: 1.25rem 1.5rem;
  max-width: 460px;
  width: 90%;
}
.theme-picker h3 { margin-bottom: 0.5rem; font-family: var(--font-display); }
.theme-picker ul { list-style: none; padding: 0; margin: 0.75rem 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem; }
.theme-picker button { padding: 0.5rem 0.7rem; border: 1px solid currentColor; width: 100%; text-align: left; font-size: 0.85rem; }
.theme-picker button[aria-current="true"] { background: var(--color-fg); color: var(--color-bg); }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* Scroll-driven video widget — fixed top-right corner, advances frames as the page scrolls. */
.video-widget {
  position: fixed;
  top: 84px;
  right: 24px;
  width: 240px;
  height: 320px;
  z-index: 90;
  pointer-events: none;
}
.video-widget-canvas {
  width: 100%;
  height: 100%;
  display: block;
}
/* Pages that use the widget reserve room so content doesn't sit behind it. */
.page-with-video { max-width: 820px; margin-left: auto; margin-right: auto; }
@media (max-width: 1100px) {
  .video-widget { width: 200px; height: 270px; right: 14px; top: 70px; }
}
@media (max-width: 860px) {
  .video-widget { display: none; }
  .page-with-video { max-width: none; }
}
@media (prefers-reduced-motion: reduce) {
  .video-widget { display: none; }
  .page-with-video { max-width: none; }
}

/* Utility — shared section bits */
.kw-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.8rem; }
.section-cta { margin-top: 1rem; font-size: 0.92rem; }

/* Teaching-card detail rows */
.teach-term {
  font-size: 0.82rem;
  opacity: 0.7;
  margin-top: 0.1rem;
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}
.teach-info { font-size: 0.95rem; line-height: 1.55; }
.teach-info a { color: var(--color-accent); text-decoration: underline; }
.teach-info a:hover { opacity: 0.8; }

/* Other section — lead + 4-card grid */
.other-lead {
  font-size: 1.05rem;
  max-width: 60ch;
  line-height: 1.55;
  margin-bottom: 1.2rem;
}
.other-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.4rem;
}
.other-card {
  display: grid;
  gap: 0.25rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid currentColor;
  border-radius: var(--card-radius, 0);
  background: var(--card-bg, transparent);
  box-shadow: var(--card-shadow, none);
  text-decoration: none;
  transition: transform 200ms ease, background 200ms ease;
}
.other-card:hover { transform: translateY(-2px); }
.other-cta { font-size: 0.92rem; opacity: 0.8; }
.other-cta a { color: var(--color-accent); }
/* legacy alias kept for any inline use */
.other-feature { display: grid; gap: 0.2rem; padding: 1.4rem 1.5rem; margin-bottom: 1.5rem; border: 1px solid currentColor; border-radius: var(--card-radius, 0); background: var(--card-bg, transparent); box-shadow: var(--card-shadow, none); text-decoration: none; transition: transform 200ms ease; }
.other-feature:hover { transform: translateY(-2px); }
.other-feature-eyebrow {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  opacity: 0.7;
  font-family: var(--font-mono, var(--font-body));
}
.other-feature-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: var(--heading-tracking, 0);
  margin-top: 0.1rem;
}
.other-feature-meta {
  font-size: 0.95rem;
  opacity: 0.78;
  margin-top: 0.3rem;
  line-height: 1.5;
}