:root {
  --canvas: #181818;
  --canvas-elevated: #303030;
  --hairline: #303030;
  --ink: #ffffff;
  --body: #969696;
  --muted: #666666;

  --xxxs: 4px;  --xxs: 8px;  --xs: 16px;  --sm: 24px;
  --md: 32px;   --lg: 48px;  --xl: 64px;  --xxl: 96px;

  --ease-out: cubic-bezier(0.2, 0.65, 0.3, 1);
}

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

html, body {
  background: var(--canvas);
  color: var(--ink);
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  padding: 0;
  text-align: left;
}

/* ===== HEADER ===== */
.site-header {
  padding: var(--xl) var(--md) var(--lg);
  border-bottom: 1px solid var(--hairline);
  max-width: 1280px;
  margin: 0 auto;
}
.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: var(--sm);
}
.site-header h1 {
  font-size: 60px;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -1.2px;
  margin-bottom: var(--sm);
  max-width: 920px;
}
.site-header .lede {
  color: var(--body);
  font-size: 16px;
  line-height: 1.55;
  max-width: 680px;
}
/* ===== SEGMENTED TOGGLES (translation + view) ===== */
.header-controls {
  display: flex;
  align-items: flex-end;
  gap: var(--xs);
  flex-wrap: wrap;
}
.translation-toggle,
.view-toggle {
  display: inline-flex;
  border: 1px solid var(--hairline);
  background: var(--canvas-elevated);
}
.translation-toggle button,
.view-toggle button {
  padding: 14px 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--body);
  transition: background 0.18s var(--ease-out), color 0.18s var(--ease-out);
}
.translation-toggle button:hover,
.view-toggle button:hover { color: var(--ink); }
.translation-toggle button.is-active,
.view-toggle button.is-active {
  background: var(--ink);
  color: var(--canvas);
}
.translation-toggle .divider,
.view-toggle .divider {
  width: 1px;
  background: var(--hairline);
}

/* ===== MAIN ===== */
main {
  padding: var(--xl) var(--md) var(--xxl);
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--xs);
}
.section-head {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.2px;
}
.modules-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--md);
  margin-bottom: var(--lg);
  flex-wrap: wrap;
}
/* ===== SCENES ===== */
.grid-scene[hidden],
.all-scene[hidden],
.module-grid[hidden],
.modules-section-head[hidden] { display: none !important; }

.verse-card-module {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--xxs);
}

/* ===== VIEW TRANSITIONS — module ⇄ panel morph =====
   Names applied via CSS classes (more reliable than setting inline style on a
   brand-new node from JS — the property assignment can no-op silently if the
   browser doesn't recognize the JS alias). The panel always carries the name
   because at most one panel exists at a time; cards get the name on demand. */
.module-card.is-vt-source { view-transition-name: active-module; }
.panel { view-transition-name: active-module; }

::view-transition-group(active-module) {
  animation-duration: 350ms;
  animation-timing-function: cubic-bezier(0.2, 0.65, 0.3, 1);
}
::view-transition-old(active-module),
::view-transition-new(active-module) {
  animation-duration: 200ms;
  animation-timing-function: cubic-bezier(0.2, 0.65, 0.3, 1);
}
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 200ms;
  animation-timing-function: cubic-bezier(0.2, 0.65, 0.3, 1);
}

/* ===== MODULE GRID ===== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--xs);
}
.module-card {
  display: flex;
  flex-direction: column;
  background: var(--canvas-elevated);
  cursor: pointer;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  user-select: none;
  width: 100%;
  position: relative;
  transition: transform 0.18s var(--ease-out);
  will-change: transform, opacity;
}
.module-card:hover { transform: translateY(-2px); }
.module-card:active { transform: translateY(0); }

.module-card .card-top {
  flex: 1 1 55%;
  background: var(--accent, var(--canvas-elevated));
  position: relative;
}
.module-card .card-top::after {
  content: "";
  position: absolute;
  bottom: var(--sm);
  left: var(--sm);
  width: 24px;
  height: 1px;
  background: rgba(255,255,255,0.6);
}
.module-card .card-bottom {
  flex: 0 0 auto;
  padding: var(--sm);
  border-top: 1px solid var(--hairline);
}
.module-card .module-num {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--body);
  margin-bottom: var(--xxs);
}
.module-card .module-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

/* ===== PANEL ===== */
.panel-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--md);
  margin-bottom: var(--md);
  padding-bottom: var(--sm);
  border-bottom: 1px solid var(--hairline);
}
.panel-title {
  font-size: 40px;
  font-weight: 500;
  letter-spacing: -0.4px;
  line-height: 1.1;
}
.panel-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: var(--sm);
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--xxs);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
  padding: var(--xs) var(--sm);
  border: 1px solid var(--ink);
  background: transparent;
  white-space: nowrap;
  height: 48px;
  user-select: none;
  transition: background 0.15s var(--ease-out), color 0.15s var(--ease-out);
}
.back-link:hover { background: var(--ink); color: var(--canvas); }

.panel-controls {
  display: flex;
  align-items: stretch;
  gap: var(--xs);
  flex-wrap: wrap;
}
.panel-controls .translation-toggle { height: 48px; }

/* ===== VERSE CARDS ===== */
.verse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--xs);
  align-items: start;
}
.verse-card {
  background: var(--canvas-elevated);
  border: 1px solid var(--hairline);
  overflow: hidden;
  display: block;
  width: 100%;
  transition: border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out);
  will-change: transform;
}
.verse-card:hover { transform: translateY(-2px); }
.verse-card.is-open { border-color: var(--accent, var(--ink)); }
.verse-card.is-open .verse-top { height: 40px; }
.all-verses-grid .verse-top { height: 40px; }

.verse-top {
  height: 120px;
  background: var(--accent, var(--canvas-elevated));
  position: relative;
  transition: height 0.36s var(--ease-out);
}
.verse-top::after {
  content: "";
  position: absolute;
  bottom: var(--xs);
  left: var(--sm);
  width: 18px;
  height: 1px;
  background: rgba(255,255,255,0.55);
}
.verse-ref {
  padding: var(--sm);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

/* CSS-only accordion via grid-template-rows. minmax(0, …) is required:
   plain `0fr` resolves to `minmax(auto, 0fr)` where auto = min-content,
   so the closed row floors at one line of text and leaks. */
.verse-text-inner {
  display: grid;
  grid-template-rows: minmax(0, 0fr);
  overflow: hidden;
  transition: grid-template-rows 0.36s var(--ease-out);
}
.verse-card.is-open .verse-text-inner {
  grid-template-rows: minmax(0, 1fr);
}
.verse-text-inner > .verse-text {
  min-height: 0;
  overflow: hidden;
}
.verse-text {
  padding: var(--sm);
  font-size: 15px;
  line-height: 1.6;
  color: var(--body);
  border-top: 1px solid var(--hairline);
}
.verse-text .niv,
.verse-text .esv { display: block; }
body[data-translation="NIV"] .verse-text .esv { display: none; }
body[data-translation="ESV"] .verse-text .niv { display: none; }

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--hairline);
  padding: var(--lg) var(--md);
  max-width: 1280px;
  margin: 0 auto;
  color: var(--body);
  font-size: 13px;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  gap: var(--md);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--md);
}
.footer-row .mark {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--ink);
}
.attribution {
  max-width: 720px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.55;
}
.byline {
  font-size: 13px;
  color: var(--ink);
}
.byline strong { font-weight: 600; }
.socials {
  display: flex;
  gap: var(--sm);
  flex-wrap: wrap;
}
.socials a {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 10px var(--sm);
  border: 1px solid var(--hairline);
  transition: background 0.15s var(--ease-out), color 0.15s var(--ease-out), border-color 0.15s var(--ease-out);
}
.socials a:hover {
  background: var(--ink);
  color: var(--canvas);
  border-color: var(--ink);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .module-grid { grid-template-columns: repeat(3, 1fr); }
  .site-header h1 { font-size: 48px; letter-spacing: -0.96px; }
  .panel-title { font-size: 32px; }
}
@media (max-width: 720px) {
  .module-grid { grid-template-columns: repeat(2, 1fr); }
  .site-header { padding: var(--lg) var(--sm) var(--md); }
  .site-header h1 { font-size: 34px; letter-spacing: -0.68px; }
  main { padding: var(--lg) var(--sm) var(--xl); }
  .panel-header { flex-direction: column; align-items: flex-start; gap: var(--sm); }
  .panel-title { font-size: 28px; }
  .modules-section-head { flex-direction: column; align-items: flex-start; }
  footer { padding: var(--md) var(--sm); }
}
@media (max-width: 420px) {
  .module-grid { grid-template-columns: 1fr 1fr; gap: var(--xxs); }
  .verse-grid  { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) {
    animation: none !important;
  }
}