/**
 * CHROME.CSS — DiscoveringDaVinci.com unified chrome
 * ==================================================
 * Symmetrical top + bottom bars, slide-out side panels, Leonardo-inspired
 * ornamentation and motion. Relies on tokens from foundation.css.
 *
 * Structure (all injected by chrome.js):
 *   .ddv-chrome-top     — fixed top bar
 *   .ddv-chrome-bottom  — fixed bottom bar (with prev/next)
 *   .ddv-panel--left    — slide-out nav tree
 *   .ddv-panel--right   — slide-out page outline
 *   .ddv-panel-scrim    — backdrop for open panel
 */

:root {
  --ddv-chrome-h: 56px;
  --ddv-chrome-h-mobile: 48px;
  --ddv-panel-w: 320px;
  --ddv-panel-w-mobile: 86vw;
  --ddv-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ddv-chrome-bg: rgba(17, 21, 29, 0.82);
  --ddv-chrome-border: rgba(205, 163, 73, 0.28);
  --ddv-chrome-shadow: 0 2px 24px rgba(0, 0, 0, 0.45);
  --ddv-z-chrome: 120;
  --ddv-z-scrim: 130;
  --ddv-z-panel: 140;
}

[data-theme="light"] {
  --ddv-chrome-bg: rgba(246, 241, 231, 0.88);
  --ddv-chrome-border: rgba(139, 105, 20, 0.32);
  --ddv-chrome-shadow: 0 2px 24px rgba(0, 0, 0, 0.12);
}

/* Body gets padding so fixed chrome never covers content */
body.ddv-has-chrome {
  padding-top: var(--ddv-chrome-h);
  padding-bottom: var(--ddv-chrome-h);
}

/* ═══════════════════════════════════════════════════════════════════════
   TOP + BOTTOM BARS
   ═══════════════════════════════════════════════════════════════════════ */
.ddv-chrome-top,
.ddv-chrome-bottom {
  position: fixed;
  left: 0;
  right: 0;
  height: var(--ddv-chrome-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-md);
  padding: 0 var(--space-lg);
  background: var(--ddv-chrome-bg);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  z-index: var(--ddv-z-chrome);
  font-family: var(--font-ui);
  color: var(--color-text-primary);
  opacity: 0;
  transform: translateY(-6px);
  animation: ddv-chrome-in 600ms var(--ddv-ease) 120ms forwards;
}

.ddv-chrome-top {
  top: 0;
  border-bottom: 1px solid var(--ddv-chrome-border);
  box-shadow: var(--ddv-chrome-shadow);
}

.ddv-chrome-bottom {
  bottom: 0;
  border-top: 1px solid var(--ddv-chrome-border);
  box-shadow: 0 -2px 24px rgba(0, 0, 0, 0.35);
  transform: translateY(6px);
}

@keyframes ddv-chrome-in {
  to { opacity: 1; transform: translateY(0); }
}

/* Slot groupings within chrome */
.ddv-slot {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
}
.ddv-slot--left  { justify-content: flex-start; }
.ddv-slot--center { justify-content: center; gap: var(--space-md); }
.ddv-slot--right { justify-content: flex-end; }

/* ── Brand mark (top-left) ── */
.ddv-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: inherit;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.ddv-brand:hover { color: var(--color-accent-secondary); background: var(--color-hover); }
.ddv-brand__star {
  color: var(--color-accent-primary);
  font-size: 1.05rem;
  line-height: 1;
  transition: transform var(--transition-medium);
}
.ddv-brand:hover .ddv-brand__star { transform: rotate(72deg); }

/* ── Top hub shortcuts (center) ── */
.ddv-hubs {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.ddv-hubs a {
  position: relative;
  padding: 0.5rem 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}
.ddv-hubs a::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.35rem;
  height: 1px;
  background: linear-gradient(90deg,
      transparent 0%,
      var(--color-accent-primary) 20%,
      var(--color-accent-secondary) 50%,
      var(--color-accent-primary) 80%,
      transparent 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 280ms var(--ddv-ease);
}
.ddv-hubs a:hover { color: var(--color-text-primary); }
.ddv-hubs a:hover::after { transform: scaleX(1); }
.ddv-hubs a[aria-current="page"] { color: var(--color-accent-secondary); }
.ddv-hubs a[aria-current="page"]::after { transform: scaleX(1); }

/* ── Icon buttons (right slot + bottom right) ── */
.ddv-iconbtn {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  color: var(--color-text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.ddv-iconbtn:hover {
  color: var(--color-accent-secondary);
  background: var(--color-hover);
  border-color: var(--color-border-subtle);
}
.ddv-iconbtn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
.ddv-iconbtn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ── Bottom bar: crumb left ── */
.ddv-crumb {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}
.ddv-crumb strong {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ── Prev / marker / next (bottom center) ── */
.ddv-nav-flow {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.ddv-nav-flow a,
.ddv-nav-flow span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  max-width: 28ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ddv-nav-flow a:hover {
  color: var(--color-accent-secondary);
  background: var(--color-hover);
  border-color: var(--ddv-chrome-border);
}
.ddv-nav-flow .ddv-nav-diamond {
  color: var(--color-accent-primary);
  font-size: 0.8rem;
  opacity: 0.7;
  padding: 0 0.25rem;
  user-select: none;
}
.ddv-nav-flow .ddv-nav-empty {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════════════════════════
   SIDE PANELS
   ═══════════════════════════════════════════════════════════════════════ */
.ddv-panel-scrim {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.78) 100%);
  opacity: 0;
  pointer-events: none;
  z-index: var(--ddv-z-scrim);
  transition: opacity 280ms var(--ddv-ease);
}
.ddv-panel-scrim.is-open {
  opacity: 1;
  pointer-events: auto;
}

.ddv-panel {
  position: fixed;
  top: 0;
  bottom: 0;
  width: var(--ddv-panel-w);
  background: var(--color-surface);
  color: var(--color-text-primary);
  z-index: var(--ddv-z-panel);
  display: flex;
  flex-direction: column;
  font-family: var(--font-ui);
  box-shadow: 0 0 48px rgba(0, 0, 0, 0.55);
  transition: transform 380ms var(--ddv-ease);
  overflow: hidden;
}
.ddv-panel--left  { left: 0; transform: translateX(-101%); border-right: 1px solid var(--ddv-chrome-border); }
.ddv-panel--right { right: 0; transform: translateX(101%); border-left: 1px solid var(--ddv-chrome-border); }
.ddv-panel.is-open { transform: translateX(0); }

.ddv-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border-subtle);
  background: linear-gradient(180deg, var(--color-surface-elevated) 0%, var(--color-surface) 100%);
}
.ddv-panel__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent-secondary);
}
.ddv-panel__body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0.75rem 0;
}
.ddv-panel__body::-webkit-scrollbar { width: 6px; }
.ddv-panel__body::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }

/* Panel sections */
.ddv-section { padding: 0.5rem 0; }
.ddv-section__label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1.25rem 0.4rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent-primary);
  opacity: 0.85;
}
.ddv-section__label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--ddv-chrome-border) 0%, transparent 100%);
}
.ddv-section ul { list-style: none; margin: 0; padding: 0; }
.ddv-section a {
  display: block;
  padding: 0.55rem 1.25rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}
.ddv-section a:hover {
  color: var(--color-text-primary);
  background: var(--color-hover);
  border-left-color: var(--color-accent-primary);
  padding-left: 1.5rem;
}
.ddv-section a[aria-current="page"] {
  color: var(--color-accent-secondary);
  border-left-color: var(--color-accent-secondary);
  background: var(--color-hover);
}

/* Ornamental divider flourish */
.ddv-flourish {
  display: block;
  margin: 0.5rem auto;
  width: 64px;
  height: 14px;
  opacity: 0.7;
  color: var(--color-accent-primary);
}

/* Panel footer: continuation */
.ddv-panel__footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: 1rem 1.25rem 1.25rem;
  background: var(--color-surface);
}
.ddv-panel__footer h4 {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent-primary);
  margin-bottom: 0.75rem;
}
.ddv-panel__footer a {
  display: block;
  padding: 0.65rem 0.8rem;
  margin-bottom: 0.4rem;
  border-radius: 8px;
  background: var(--color-surface-elevated);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  border: 1px solid var(--color-border-subtle);
  transition: all var(--transition-fast);
}
.ddv-panel__footer a:hover {
  color: var(--color-accent-secondary);
  border-color: var(--color-accent-primary);
  transform: translateX(4px);
}

/* Outline auto-list (right panel) */
.ddv-outline { padding: 0 0.5rem; }
.ddv-outline a {
  display: block;
  padding: 0.4rem 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.35;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}
.ddv-outline a:hover {
  color: var(--color-text-primary);
  background: var(--color-hover);
  border-left-color: var(--color-accent-primary);
}
.ddv-outline .ddv-outline--h3 { padding-left: 1.4rem; font-size: 0.82rem; opacity: 0.88; }
.ddv-outline .ddv-outline--h4 { padding-left: 2.2rem; font-size: 0.78rem; opacity: 0.75; }

/* ═══════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .ddv-hubs { display: none; }
  .ddv-slot--center .ddv-nav-flow a span.ddv-nav-label { display: none; }
  .ddv-slot--center .ddv-nav-flow a {
    padding: 0.45rem 0.55rem;
  }
  .ddv-slot--center .ddv-nav-flow a svg {
    width: 20px; height: 20px;
  }
}

/* Lift any floating page-level controls above our bottom bar */
body.ddv-has-chrome .intro-replay,
body.ddv-has-chrome .replay-intro-btn,
body.ddv-has-chrome [data-intro-replay] {
  bottom: calc(var(--ddv-chrome-h) + 12px) !important;
}

@media (max-width: 640px) {
  :root { --ddv-chrome-h: var(--ddv-chrome-h-mobile); }
  .ddv-chrome-top,
  .ddv-chrome-bottom {
    padding: 0 var(--space-sm);
    gap: var(--space-xs);
  }
  .ddv-brand { font-size: 0.78rem; letter-spacing: 0.08em; padding: 0.3rem 0.4rem; }
  .ddv-brand__label { display: none; }
  .ddv-panel { width: var(--ddv-panel-w-mobile); }
  .ddv-iconbtn { width: 36px; height: 36px; }
  .ddv-crumb { font-size: 0.7rem; letter-spacing: 0.1em; }
  .ddv-nav-flow a,
  .ddv-nav-flow span {
    padding: 0.4rem 0.55rem;
    font-size: 0.72rem;
    max-width: 14ch;
  }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .ddv-chrome-top,
  .ddv-chrome-bottom,
  .ddv-panel,
  .ddv-panel-scrim,
  .ddv-hubs a::after,
  .ddv-brand__star {
    animation: none !important;
    transition: none !important;
  }
}

/* Hide legacy nav when our chrome takes over */
body.ddv-has-chrome .davinci-unimenu,
body.ddv-has-chrome .davinci-menu { display: none !important; }
body.ddv-has-chrome { padding-left: 0 !important; }