/* Copyright (c) 2025-2026 CS Inspiration. All Rights Reserved.
   VietAlpha - https://csinspiration.org
   Models drop-down attached to the Research item in the header nav.
   Self-contained: the three nav flavours on this site (.site-menu, .page-nav,
   .nav-links) declare different token names, so nothing here reads a page token.
   Markup is injected by /assets/nav-models.js. */

.va-models {
  --vam-paper: #FAF9F5;
  --vam-ink: #191919;
  --vam-muted: #6B6862;
  --vam-rule: rgba(25, 25, 25, 0.14);
  --vam-rule-soft: rgba(25, 25, 25, 0.08);
  --vam-hover: rgba(25, 25, 25, 0.045);
  --vam-serif: 'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --vam-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;

  position: relative;
  display: inline-flex;
}

.va-models-row {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.va-models-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: none;
  color: currentColor;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}
.va-models-toggle:hover { opacity: 1; background: var(--vam-hover); }
.va-models.is-open .va-models-toggle { opacity: 1; }
.va-models-toggle svg { transition: transform 0.18s ease; }
.va-models.is-open .va-models-toggle svg { transform: rotate(180deg); }

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

/* ── Panel ───────────────────────────────────────────────── */
.va-models-panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  z-index: 120;
  width: 292px;
  padding: 6px;
  background: var(--vam-paper);
  border: 1px solid var(--vam-rule);
  border-radius: 10px;
  box-shadow: 0 12px 30px rgba(25, 25, 25, 0.10), 0 1px 2px rgba(25, 25, 25, 0.06);
  text-align: left;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.14s ease, transform 0.14s ease;
}
.va-models-panel[hidden] { display: none; }
.va-models.is-open .va-models-panel { opacity: 1; transform: none; }

.va-models.is-flipped .va-models-panel { left: auto; right: 0; }

/* The beak points back at the caret. */
.va-models-panel::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 22px;
  width: 8px;
  height: 8px;
  background: var(--vam-paper);
  border-left: 1px solid var(--vam-rule);
  border-top: 1px solid var(--vam-rule);
  transform: rotate(45deg);
  border-top-left-radius: 2px;
}
.va-models.is-flipped .va-models-panel::before { left: auto; right: 22px; }

.va-models-title {
  margin: 0;
  padding: 7px 10px 9px;
  font-family: var(--vam-sans);
  font-size: 11.5px;
  font-weight: 500;
  line-height: 1;
  color: var(--vam-muted);
  border-bottom: 1px solid var(--vam-rule-soft);
}

/* ── Specimen ────────────────────────────────────────────── */
.va-models-item {
  display: block;
  padding: 11px 10px 12px;
  border-radius: 7px;
  color: var(--vam-ink);
  text-decoration: none;
  transition: background-color 0.15s ease;
}
.va-models-item + .va-models-item { margin-top: 2px; }
.va-models-item:hover { background: var(--vam-hover); }

.va-models-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}
.va-models-name {
  font-family: var(--vam-serif);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--vam-ink);
}
.va-models-date {
  flex: none;
  font-family: var(--vam-sans);
  font-size: 11px;
  line-height: 1.2;
  color: var(--vam-muted);
  font-variant-numeric: tabular-nums;
}
.va-models-role {
  margin-top: 3px;
  font-family: var(--vam-sans);
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--vam-muted);
}


/* ── Inside the mobile drawer the panel is part of the list ─ */
@media (max-width: 820px) {
  .site-menu .va-models { display: block; position: static; width: 100%; }
  .site-menu .va-models-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }
  .site-menu .va-models-row > a { flex: 1 1 auto; }
  .site-menu .va-models-toggle { width: 34px; height: 34px; opacity: 1; }
  .site-menu .va-models-panel {
    position: static;
    width: 100%;
    margin: 0 0 12px;
    box-shadow: none;
    transform: none;
  }
  .site-menu .va-models-panel::before { display: none; }
}

/* Narrow viewports: never let the panel run off the right edge. */
@media (max-width: 420px) {
  .page-nav .va-models-panel,
  .nav-links .va-models-panel { width: min(292px, calc(100vw - 32px)); }
}

@media (prefers-reduced-motion: reduce) {
  .va-models-panel,
  .va-models-toggle,
  .va-models-toggle svg,
  .va-models-item { transition: none; }
  .va-models-panel { transform: none; }
}