/* ═══════════════════════════════════════════════════════════
   COMPONENTS — overlay · toast · back-to-top
═══════════════════════════════════════════════════════════ */

/* ─── OVERLAY ─────────────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s;
}
.overlay.open {
  opacity: 1;
  pointer-events: all;
}

.overlay-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(22, 19, 14, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.overlay-card {
  position: relative;
  z-index: 1;
  background: var(--paper);
  max-width: 640px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  border: 1px solid var(--rule);
  transform: translateY(20px) scale(0.98);
  transition: transform 0.28s var(--ease);
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}
.overlay.open .overlay-card {
  transform: translateY(0) scale(1);
}

/* Sticky header row */
.overlay-top {
  position: sticky;
  top: 0;
  background: var(--paper);
  padding: 0.95rem 1.6rem;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 2;
}

.overlay-nav {
  display: flex;
  gap: 0.4rem;
}

.overlay-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--rule);
  padding: 0.35em 0.75em;
  transition:
    border-color var(--t-fast),
    color var(--t-fast);
}
.overlay-nav-btn:hover:not(:disabled) {
  border-color: var(--ink);
  color: var(--ink);
}
.overlay-nav-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}
.overlay-nav-btn:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 2px;
}
.overlay-nav-btn svg {
  flex-shrink: 0;
}

.overlay-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.overlay-close {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--rule);
  padding: 0.35em 0.75em;
  transition:
    border-color var(--t-fast),
    color var(--t-fast);
}
.overlay-close:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.overlay-close:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 2px;
}
.overlay-close svg {
  flex-shrink: 0;
}

/* Body */
.overlay-body {
  padding: 2rem 1.8rem;
}

.overlay-tag {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 0.75rem;
}

.overlay-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 300;
  line-height: 1.1;
  margin-bottom: 1.3rem;
  letter-spacing: -0.01em;
}

.overlay-hook {
  font-style: italic;
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink2);
  border-left: 2px solid var(--rust);
  padding-left: 1rem;
  margin-bottom: 1.6rem;
}

.overlay-desc {
  font-size: 0.97rem;
  font-weight: 400;
  line-height: 1.78;
  color: var(--ink2);
  margin-bottom: 2rem;
}
.overlay-desc p + p {
  margin-top: 1em;
}

/* Footer row */
.overlay-footer {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.overlay-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--ink);
  padding: 0.75em 1.3em;
  border: 1.5px solid var(--ink);
  transition:
    background var(--t-fast),
    border-color var(--t-fast);
}
.overlay-link:hover {
  background: var(--rust);
  border-color: var(--rust);
}
.overlay-link:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 3px;
}

.overlay-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1.5px solid var(--rule);
  padding: 0.75em 1.1em;
  transition:
    border-color var(--t-fast),
    color var(--t-fast);
}
.overlay-share-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.overlay-share-btn:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 3px;
}

/* ─── BACK TO TOP ─────────────────────────────────────────── */
#back-top {
  position: fixed;
  bottom: 5rem; /* clear the toast zone */
  right: 2rem;
  z-index: 400;
  width: 38px;
  height: 38px;
  background: var(--ink);
  border: 1px solid rgba(244, 240, 232, 0.12); /* subtle edge, not harsh */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity var(--t-med),
    transform var(--t-med) var(--ease),
    background var(--t-fast),
    border-color var(--t-fast);
  pointer-events: none;
}
#back-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
#back-top:hover {
  background: var(--rust);
  border-color: transparent;
}
#back-top:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 3px;
}
#back-top svg {
  width: 12px;
  height: 12px;
  color: var(--paper);
}

/* ─── TOAST ──────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  z-index: 8000;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.7em 1.4em;
  opacity: 0;
  transition:
    opacity 0.18s,
    transform 0.22s var(--ease);
  pointer-events: none;
  white-space: nowrap;
  border: 1px solid rgba(244, 240, 232, 0.08);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ─── RESPONSIVE OVERLAY ──────────────────────────────────── */
@media (max-width: 520px) {
  .overlay {
    padding: 0;
    align-items: flex-end;
  }
  .overlay-card {
    max-height: 92vh;
    border-bottom: none;
  }
  .overlay-body {
    padding: 1.5rem 1.2rem;
  }
  .overlay-top {
    padding: 0.9rem 1.2rem;
  }
}