/* ==========================================================================
   Physion Dictionary — Material Design 3 layer for Bootstrap 5.3
   ========================================================================== */

/* --------------------------------------------------------------- 1. Tokens */
:root {
  /* Key colour: derived from the Physion logo (deep navy → vivid blue) */
  --md-primary: #1b4de4;
  --md-on-primary: #ffffff;
  --md-primary-container: #dce1ff;
  --md-on-primary-container: #001551;

  --md-secondary: #00789a;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #b4ebff;
  --md-on-secondary-container: #001f2a;

  --md-tertiary: #6a4bb8;
  --md-tertiary-container: #e8ddff;
  --md-on-tertiary-container: #22005d;

  --md-error: #ba1a1a;
  --md-on-error: #ffffff;
  --md-error-container: #ffdad6;
  --md-on-error-container: #410002;

  --md-success: #146c2e;
  --md-success-container: #a6f4ba;
  --md-on-success-container: #002108;

  --md-surface: #fbf8ff;
  --md-surface-dim: #dbd9e0;
  --md-surface-bright: #fbf8ff;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #f5f2fa;
  --md-surface-container: #efedf4;
  --md-surface-container-high: #e9e7ef;
  --md-surface-container-highest: #e3e1e9;
  --md-on-surface: #1a1b21;
  --md-on-surface-variant: #45464f;
  --md-outline: #767780;
  --md-outline-variant: #c6c6d0;
  --md-inverse-surface: #2f3036;
  --md-inverse-on-surface: #f2f0f7;
  --md-scrim: 0, 0, 0;

  /* Elevation */
  --md-e1: 0 1px 2px rgba(16, 20, 45, .3), 0 1px 3px 1px rgba(16, 20, 45, .11);
  --md-e2: 0 1px 2px rgba(16, 20, 45, .3), 0 2px 6px 2px rgba(16, 20, 45, .11);
  --md-e3: 0 4px 8px 3px rgba(16, 20, 45, .11), 0 1px 3px rgba(16, 20, 45, .3);
  --md-e4: 0 6px 10px 4px rgba(16, 20, 45, .11), 0 2px 3px rgba(16, 20, 45, .3);
  --md-e5: 0 8px 12px 6px rgba(16, 20, 45, .11), 0 4px 4px rgba(16, 20, 45, .3);

  /* Shape */
  --md-r-xs: 4px;
  --md-r-sm: 8px;
  --md-r-md: 12px;
  --md-r-lg: 16px;
  --md-r-xl: 28px;
  --md-r-full: 999px;

  /* Motion */
  --md-ease: cubic-bezier(.2, 0, 0, 1);
  --md-ease-emph: cubic-bezier(.2, 0, 0, 1);
  --md-dur: .28s;

  /* Bootstrap bridge */
  --bs-body-bg: var(--md-surface);
  --bs-body-color: var(--md-on-surface);
  --bs-primary: var(--md-primary);
  --bs-link-color: var(--md-primary);
  --bs-link-hover-color: var(--md-on-primary-container);
  --bs-border-color: var(--md-outline-variant);
  --bs-border-radius: var(--md-r-md);
  --bs-font-sans-serif: "Google Sans", "Roboto", -apple-system, "Segoe UI", system-ui, sans-serif;
  --bs-focus-ring-color: rgba(27, 77, 228, .28);
}

[data-bs-theme="dark"] {
  --md-primary: #b7c4ff;
  --md-on-primary: #00257e;
  --md-primary-container: #0037b0;
  --md-on-primary-container: #dce1ff;

  --md-secondary: #5cd5fb;
  --md-on-secondary: #003545;
  --md-secondary-container: #004d63;
  --md-on-secondary-container: #b4ebff;

  --md-tertiary: #cebdff;
  --md-tertiary-container: #52309f;
  --md-on-tertiary-container: #e8ddff;

  --md-error: #ffb4ab;
  --md-on-error: #690005;
  --md-error-container: #93000a;
  --md-on-error-container: #ffdad6;

  --md-success: #8bd89f;
  --md-success-container: #00531a;
  --md-on-success-container: #a6f4ba;

  --md-surface: #121318;
  --md-surface-dim: #121318;
  --md-surface-bright: #383a40;
  --md-surface-container-lowest: #0d0e13;
  --md-surface-container-low: #1a1b21;
  --md-surface-container: #1e1f25;
  --md-surface-container-high: #282a2f;
  --md-surface-container-highest: #33353a;
  --md-on-surface: #e4e1e9;
  --md-on-surface-variant: #c6c6d0;
  --md-outline: #90909a;
  --md-outline-variant: #45464f;
  --md-inverse-surface: #e4e1e9;
  --md-inverse-on-surface: #303036;
  --md-scrim: 0, 0, 0;

  --md-e1: 0 1px 3px rgba(0, 0, 0, .6), 0 1px 2px rgba(0, 0, 0, .4);
  --md-e2: 0 2px 6px 2px rgba(0, 0, 0, .5), 0 1px 2px rgba(0, 0, 0, .5);
  --md-e3: 0 4px 8px 3px rgba(0, 0, 0, .5), 0 1px 3px rgba(0, 0, 0, .55);
  --md-e4: 0 6px 10px 4px rgba(0, 0, 0, .5), 0 2px 3px rgba(0, 0, 0, .55);
  --md-e5: 0 8px 12px 6px rgba(0, 0, 0, .5), 0 4px 4px rgba(0, 0, 0, .55);

  --bs-focus-ring-color: rgba(183, 196, 255, .3);
}

/* ---------------------------------------------------------------- 2. Base */
* { -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }

body {
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: var(--bs-font-sans-serif);
  font-size: 1rem;
  line-height: 1.55;
  letter-spacing: .0015em;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection { background: var(--md-primary-container); color: var(--md-on-primary-container); }

.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  line-height: 1;
  user-select: none;
  vertical-align: middle;
}
.material-symbols-rounded.fill { font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24; }
.msr-sm { font-size: 18px; }
.msr-lg { font-size: 28px; }
.msr-xl { font-size: 40px; }

/* Type scale */
.md-display  { font-size: clamp(2.1rem, 1.4rem + 2.6vw, 3.4rem); line-height: 1.12; font-weight: 700; letter-spacing: -.02em; }
.md-headline { font-size: clamp(1.5rem, 1.2rem + 1.1vw, 2rem); line-height: 1.22; font-weight: 600; letter-spacing: -.012em; }
.md-title    { font-size: 1.125rem; line-height: 1.4; font-weight: 600; letter-spacing: .0015em; }
.md-label    { font-size: .8125rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.md-body     { font-size: .95rem; line-height: 1.6; }
.md-support  { font-size: .8125rem; color: var(--md-on-surface-variant); }

.text-variant { color: var(--md-on-surface-variant) !important; }
.text-primary-md { color: var(--md-primary) !important; }

/* Flex utilities Bootstrap does not ship, used throughout the layouts. */
.min-w-0 { min-width: 0 !important; }
.flex-none { flex: none !important; }

/* Scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--md-outline-variant) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--md-outline-variant); border: 3px solid transparent; background-clip: content-box; border-radius: 999px; }
*::-webkit-scrollbar-thumb:hover { background: var(--md-outline); background-clip: content-box; }

/* ------------------------------------------------------------- 3. Surfaces */
.md-surface       { background: var(--md-surface-container-lowest); }
.md-surface-low   { background: var(--md-surface-container-low); }
.md-surface-c     { background: var(--md-surface-container); }
.md-surface-high  { background: var(--md-surface-container-high); }

.md-card {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-lg);
  transition: box-shadow var(--md-dur) var(--md-ease), transform var(--md-dur) var(--md-ease), border-color var(--md-dur) var(--md-ease);
  position: relative;
}
.md-card-elevated { border-color: transparent; box-shadow: var(--md-e1); background: var(--md-surface-container-low); }
.md-card-filled   { border-color: transparent; background: var(--md-surface-container-high); }

/* ---------------------------------------------------------- 4. Ripple/state */
.md-ripple { position: relative; overflow: hidden; isolation: isolate; }
.md-ripple > .ripple-ink {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: currentColor;
  opacity: .18;
  pointer-events: none;
  animation: md-ripple-out .6s var(--md-ease) forwards;
}
@keyframes md-ripple-out { to { transform: scale(2.6); opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}

/* -------------------------------------------------------------- 5. Buttons */
.btn {
  --bs-btn-border-radius: var(--md-r-full);
  border-radius: var(--md-r-full);
  font-weight: 600;
  letter-spacing: .012em;
  padding: .625rem 1.4rem;
  transition: box-shadow var(--md-dur) var(--md-ease), background-color var(--md-dur) var(--md-ease), color .2s var(--md-ease), transform .12s var(--md-ease);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  border: none;
}
.btn:active { transform: scale(.975); }
.btn:focus-visible { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 2px; box-shadow: none; }

.btn-md-filled { background: var(--md-primary); color: var(--md-on-primary); }
.btn-md-filled:hover { background: var(--md-primary); color: var(--md-on-primary); box-shadow: var(--md-e1); filter: brightness(1.08); }

.btn-md-tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.btn-md-tonal:hover { background: var(--md-secondary-container); color: var(--md-on-secondary-container); box-shadow: var(--md-e1); filter: brightness(.97); }

.btn-md-primary-tonal { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.btn-md-primary-tonal:hover { background: var(--md-primary-container); color: var(--md-on-primary-container); box-shadow: var(--md-e1); filter: brightness(.97); }

.btn-md-outlined { background: transparent; color: var(--md-primary); box-shadow: inset 0 0 0 1px var(--md-outline); }
.btn-md-outlined:hover { background: color-mix(in srgb, var(--md-primary) 8%, transparent); color: var(--md-primary); }

.btn-md-text { background: transparent; color: var(--md-primary); padding-inline: 1rem; }
.btn-md-text:hover { background: color-mix(in srgb, var(--md-primary) 10%, transparent); color: var(--md-primary); }

.btn-md-danger { background: var(--md-error-container); color: var(--md-on-error-container); }
.btn-md-danger:hover { background: var(--md-error); color: var(--md-on-error); }

.btn-md-success { background: var(--md-success-container); color: var(--md-on-success-container); }
.btn-md-success:hover { background: var(--md-success-container); color: var(--md-on-success-container); filter: brightness(.96); }

.btn-sm { padding: .375rem .9rem; font-size: .8125rem; }

/* Icon button */
.md-icon-btn {
  width: 44px; height: 44px;
  display: inline-grid; place-items: center;
  border: none; background: transparent;
  color: var(--md-on-surface-variant);
  border-radius: var(--md-r-full);
  transition: background-color var(--md-dur) var(--md-ease), color var(--md-dur) var(--md-ease);
  cursor: pointer; flex: none;
}
.md-icon-btn:hover { background: color-mix(in srgb, var(--md-on-surface) 9%, transparent); color: var(--md-on-surface); }
.md-icon-btn:focus-visible { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 1px; }
.md-icon-btn.active { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.md-icon-btn-sm { width: 36px; height: 36px; }
.md-icon-btn-sm .material-symbols-rounded { font-size: 20px; }

/* FAB */
.md-fab {
  position: fixed; right: max(1.25rem, env(safe-area-inset-right)); bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 1030;
  display: inline-flex; align-items: center; gap: .625rem;
  padding: 1rem 1.25rem;
  border: none;
  border-radius: var(--md-r-lg);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  box-shadow: var(--md-e3);
  font-weight: 600;
  transition: box-shadow var(--md-dur) var(--md-ease), transform var(--md-dur) var(--md-ease);
}
.md-fab:hover { box-shadow: var(--md-e4); transform: translateY(-2px); color: var(--md-on-primary-container); }

/* ------------------------------------------------------------- 6. App bar */
.md-appbar {
  position: sticky; top: 0; z-index: 1040;
  background: color-mix(in srgb, var(--md-surface) 82%, transparent);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--md-dur) var(--md-ease), background-color var(--md-dur) var(--md-ease), box-shadow var(--md-dur) var(--md-ease);
}
.md-appbar.scrolled {
  background: color-mix(in srgb, var(--md-surface-container) 88%, transparent);
  border-bottom-color: var(--md-outline-variant);
}
.md-appbar-inner { display: flex; align-items: center; gap: .75rem; min-height: 68px; }

.brand { display: inline-flex; align-items: center; gap: .625rem; text-decoration: none; flex: none; }
.brand img { height: 38px; width: auto; display: block; transition: transform var(--md-dur) var(--md-ease); }
.brand:hover img { transform: scale(1.03); }
/* The logo is a navy wordmark on transparency, so in dark mode every instance
   of it gets a light plate to stay legible. */
[data-bs-theme="dark"] .app-logo {
  background: #fff;
  padding: 5px 10px;
  border-radius: var(--md-r-md);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .12);
}
[data-bs-theme="dark"] .app-logo-tight { padding: 4px 6px; border-radius: var(--md-r-sm); }

.md-navlink {
  padding: .5rem .95rem;
  border-radius: var(--md-r-full);
  color: var(--md-on-surface-variant);
  text-decoration: none;
  font-weight: 600;
  font-size: .9rem;
  display: inline-flex; align-items: center; gap: .4rem;
  transition: background-color var(--md-dur) var(--md-ease), color var(--md-dur) var(--md-ease);
  white-space: nowrap;
}
.md-navlink:hover { background: color-mix(in srgb, var(--md-on-surface) 8%, transparent); color: var(--md-on-surface); }
.md-navlink.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }

/* ---------------------------------------------------------- 7. Search bar */
.md-search {
  position: relative;
  display: flex; align-items: center; gap: .5rem;
  background: var(--md-surface-container-high);
  border-radius: var(--md-r-full);
  padding: .3rem .35rem .3rem 1rem;
  transition: box-shadow var(--md-dur) var(--md-ease), background-color var(--md-dur) var(--md-ease);
  border: 1px solid transparent;
}
.md-search:focus-within { box-shadow: var(--md-e2); background: var(--md-surface-container-lowest); border-color: var(--md-outline-variant); }
.md-search input {
  flex: 1 1 auto; min-width: 0;
  border: none; background: transparent; outline: none;
  color: var(--md-on-surface);
  font-size: 1rem; padding: .7rem 0;
}
.md-search input::placeholder { color: var(--md-on-surface-variant); opacity: .85; }
.md-search-lg { padding-left: 1.25rem; box-shadow: var(--md-e1); }
.md-search-lg input { font-size: 1.05rem; padding: .95rem 0; }

.md-suggest {
  position: absolute; left: 0; right: 0; top: calc(100% + .5rem);
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-lg);
  box-shadow: var(--md-e3);
  overflow: hidden auto;
  max-height: min(60vh, 460px);
  z-index: 1060;
  display: none;
  padding: .4rem;
  text-align: left; /* the hero centres its content; the menu must not inherit that */
}
.md-suggest.show { display: block; animation: md-fade-in .18s var(--md-ease); }
@keyframes md-fade-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

.md-suggest-item {
  display: flex; align-items: flex-start; gap: .75rem;
  padding: .65rem .75rem;
  border-radius: var(--md-r-md);
  color: inherit; text-decoration: none;
  transition: background-color .15s var(--md-ease);
}
.md-suggest-item:hover, .md-suggest-item.is-active { background: var(--md-surface-container-high); color: inherit; }
.md-suggest-item .si-ico { color: var(--md-primary); margin-top: 2px; }
.md-suggest-item mark { background: color-mix(in srgb, var(--md-primary) 22%, transparent); color: inherit; padding: 0 1px; border-radius: 3px; }
.md-suggest-empty { padding: 1.25rem; text-align: center; color: var(--md-on-surface-variant); }

/* --------------------------------------------------------------- 8. Chips */
.md-chipset { display: flex; flex-wrap: wrap; gap: .5rem; }
.md-chipset-scroll {
  flex-wrap: nowrap; overflow-x: auto; padding-bottom: .35rem;
  scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
}
.md-chipset-scroll::-webkit-scrollbar { height: 5px; }
.md-chip {
  display: inline-flex; align-items: center; gap: .375rem;
  padding: .45rem .85rem;
  border-radius: var(--md-r-sm);
  border: 1px solid var(--md-outline-variant);
  background: transparent;
  color: var(--md-on-surface-variant);
  font-size: .84rem; font-weight: 600; letter-spacing: .01em;
  text-decoration: none; white-space: nowrap; flex: none;
  scroll-snap-align: start;
  transition: background-color .2s var(--md-ease), color .2s var(--md-ease), border-color .2s var(--md-ease), box-shadow .2s var(--md-ease);
  cursor: pointer;
}
.md-chip:hover { background: color-mix(in srgb, var(--md-on-surface) 8%, transparent); color: var(--md-on-surface); }
.md-chip.selected {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
  box-shadow: var(--md-e1);
}
.md-chip .chip-count {
  font-size: .72rem; font-weight: 700;
  background: color-mix(in srgb, var(--md-on-surface) 10%, transparent);
  padding: .05rem .4rem; border-radius: var(--md-r-full);
}
.md-chip.selected .chip-count { background: color-mix(in srgb, var(--md-on-secondary-container) 16%, transparent); }

/* Category badge */
.md-badge {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  padding: .25rem .6rem;
  border-radius: var(--md-r-xs);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  text-decoration: none;
}
.md-badge-soft { background: color-mix(in srgb, var(--md-on-surface) 8%, transparent); color: var(--md-on-surface-variant); }

/* Unit values in this dataset are descriptive prose ("Dimensionless (0 to 1)"),
   so they stay in their stored case and truncate rather than shout. */
.md-badge-tertiary {
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
  text-transform: none;
  letter-spacing: .01em;
  font-size: .74rem;
  font-weight: 600;
  max-width: 100%;
  display: inline-block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Alphabet rail */
.md-alpha { display: flex; flex-wrap: wrap; gap: .25rem; }
.md-alpha a {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: var(--md-r-full);
  font-size: .82rem; font-weight: 700;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  transition: background-color .18s var(--md-ease), color .18s var(--md-ease);
}
.md-alpha a:hover { background: var(--md-surface-container-high); color: var(--md-on-surface); }
.md-alpha a.selected { background: var(--md-primary); color: var(--md-on-primary); }
.md-alpha a.disabled { opacity: .3; pointer-events: none; }

/* ---------------------------------------------------------------- 9. Hero */
.md-hero {
  position: relative;
  padding: clamp(2.5rem, 1.5rem + 4vw, 5rem) 0 clamp(2rem, 1rem + 3vw, 3.25rem);
  overflow: hidden;
}
.md-hero::before {
  content: ""; position: absolute; inset: -25% -8% auto -8%; height: 130%;
  background:
    radial-gradient(48% 55% at 18% 22%, color-mix(in srgb, var(--md-primary) 26%, transparent) 0%, transparent 62%),
    radial-gradient(42% 48% at 82% 12%, color-mix(in srgb, var(--md-secondary) 25%, transparent) 0%, transparent 60%),
    radial-gradient(38% 44% at 55% 88%, color-mix(in srgb, var(--md-tertiary) 20%, transparent) 0%, transparent 62%);
  pointer-events: none;
  will-change: transform;
  animation: md-aurora 26s ease-in-out infinite alternate;
}
@keyframes md-aurora {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  50%  { transform: translate3d(-2%, 1.5%, 0) scale(1.06); }
  100% { transform: translate3d(2%, -1.5%, 0) scale(1.02); }
}
.md-hero > * { position: relative; z-index: 1; }

.brand-logo-lg { height: clamp(52px, 8vw, 76px); width: auto; }

.md-stat-strip { display: flex; flex-wrap: wrap; gap: .5rem 1.75rem; }
.md-stat-strip .stat { display: flex; align-items: baseline; gap: .4rem; }
.md-stat-strip .stat b { font-size: 1.15rem; font-weight: 700; color: var(--md-on-surface); }

/* --------------------------------------------------------- 10. Term cards */
.term-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(288px, 1fr)); gap: 1rem; }

.term-card {
  display: flex; flex-direction: column; gap: .55rem;
  padding: 1.15rem 1.25rem 1.25rem;
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-lg);
  color: inherit; text-decoration: none;
  transition: box-shadow var(--md-dur) var(--md-ease), transform var(--md-dur) var(--md-ease), border-color var(--md-dur) var(--md-ease);
  overflow: hidden; position: relative;
}
.term-card::after {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: linear-gradient(180deg, var(--md-primary), var(--md-secondary));
  transform: scaleY(0); transform-origin: top;
  transition: transform var(--md-dur) var(--md-ease);
}
.term-card:hover { box-shadow: var(--md-e2); transform: translateY(-3px); border-color: transparent; color: inherit; }
.term-card:hover::after { transform: scaleY(1); }
.term-card:focus-visible { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 2px; }
.term-card h3 { font-size: 1.075rem; font-weight: 700; margin: 0; letter-spacing: -.005em; }
.term-card .tc-def {
  font-size: .875rem; color: var(--md-on-surface-variant); margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.term-card .tc-meta { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; padding-top: .35rem; }
.term-card mark { background: color-mix(in srgb, var(--md-secondary) 30%, transparent); color: inherit; padding: 0 2px; border-radius: 3px; }

.md-formula {
  font-family: "Cambria", "Georgia", "Times New Roman", serif;
  font-size: .84rem; font-style: italic;
  background: color-mix(in srgb, var(--md-tertiary) 12%, transparent);
  color: var(--md-on-surface);
  border: 1px dashed color-mix(in srgb, var(--md-tertiary) 40%, transparent);
  padding: .15rem .5rem; border-radius: var(--md-r-xs);
  display: inline-block; max-width: 100%;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ------------------------------------------------------- 11. Term detail */
.term-hero {
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-xl);
  padding: clamp(1.5rem, 1rem + 2vw, 2.5rem);
  position: relative; overflow: hidden;
}
.term-hero::before {
  content: ""; position: absolute; inset: auto -6rem -8rem auto; width: 20rem; height: 20rem;
  background: radial-gradient(circle, color-mix(in srgb, var(--md-primary) 20%, transparent), transparent 68%);
  pointer-events: none;
}
.term-hero > * { position: relative; }

.md-panel {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-lg);
  padding: 1.35rem 1.5rem;
}
.md-panel-h { display: flex; align-items: center; gap: .55rem; margin-bottom: .85rem; }
.md-panel-h .material-symbols-rounded { color: var(--md-primary); font-size: 22px; }
.md-panel-h h2 { font-size: 1rem; font-weight: 700; margin: 0; letter-spacing: .01em; }

.md-datapill {
  display: flex; align-items: center; gap: .85rem;
  padding: .9rem 1.1rem;
  border-radius: var(--md-r-md);
  background: var(--md-surface-container);
  border: 1px solid transparent;
  height: 100%;
}
.md-datapill .dp-ico {
  width: 42px; height: 42px; flex: none;
  display: grid; place-items: center; border-radius: var(--md-r-md);
  background: var(--md-primary-container); color: var(--md-on-primary-container);
}
.md-datapill .dp-k { font-size: .7rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--md-on-surface-variant); }
.md-datapill .dp-v { font-size: 1.02rem; font-weight: 600; word-break: break-word; }
.md-datapill .dp-v.serif { font-family: "Cambria", "Georgia", serif; font-style: italic; font-size: 1.15rem; }

.md-quote {
  border-left: 3px solid var(--md-secondary);
  background: color-mix(in srgb, var(--md-secondary) 9%, transparent);
  border-radius: 0 var(--md-r-md) var(--md-r-md) 0;
  padding: 1rem 1.15rem;
}

.md-toc { position: sticky; top: 88px; }
.md-toc a {
  display: flex; align-items: center; gap: .55rem;
  padding: .55rem .8rem; border-radius: var(--md-r-full);
  color: var(--md-on-surface-variant); text-decoration: none; font-size: .875rem; font-weight: 600;
  transition: background-color .18s var(--md-ease), color .18s var(--md-ease);
}
.md-toc a:hover, .md-toc a.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }

.md-list-link {
  display: flex; align-items: center; justify-content: space-between; gap: .75rem;
  padding: .7rem .9rem; border-radius: var(--md-r-md);
  color: inherit; text-decoration: none;
  transition: background-color .18s var(--md-ease);
}
.md-list-link:hover { background: var(--md-surface-container-high); color: inherit; }
.md-list-link .material-symbols-rounded { color: var(--md-on-surface-variant); font-size: 20px; }

/* ---------------------------------------------------------- 12. Form fields */
.md-field { position: relative; margin-bottom: 1.35rem; }
.md-field > label {
  position: absolute; left: .95rem; top: 1.05rem;
  font-size: 1rem; color: var(--md-on-surface-variant);
  pointer-events: none; transform-origin: left top;
  transition: transform .18s var(--md-ease), color .18s var(--md-ease);
  padding: 0 .3rem; background: transparent; z-index: 2;
  max-width: calc(100% - 2rem); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.md-field .form-control, .md-field .form-select {
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline);
  border-radius: var(--md-r-xs) var(--md-r-xs) var(--md-r-xs) var(--md-r-xs);
  color: var(--md-on-surface);
  padding: 1.55rem .95rem .55rem;
  font-size: 1rem;
  min-height: 58px;
  transition: border-color .18s var(--md-ease), box-shadow .18s var(--md-ease), background-color .18s var(--md-ease);
  box-shadow: none;
}
.md-field textarea.form-control { min-height: 108px; resize: vertical; line-height: 1.55; }
.md-field .form-control:focus, .md-field .form-select:focus {
  background: var(--md-surface-container-low);
  color: var(--md-on-surface);
  border-color: var(--md-primary);
  box-shadow: inset 0 0 0 1px var(--md-primary);
}
.md-field .form-control::placeholder { color: transparent; }
.md-field .form-control:focus::placeholder { color: color-mix(in srgb, var(--md-on-surface-variant) 65%, transparent); }
/* A select always renders its current option, so its label must never rest on
   top of that text — keep it permanently in the floated position. */
.md-field .form-select + label { transform: translateY(-.72rem) scale(.75); }

.md-field .form-control:focus + label,
.md-field .form-control:not(:placeholder-shown) + label,
.md-field .form-select:focus + label,
.md-field.filled > label {
  transform: translateY(-.72rem) scale(.75);
  color: var(--md-primary);
}
.md-field .form-control:not(:focus):not(:placeholder-shown) + label,
.md-field .form-select:not(:focus) + label { color: var(--md-on-surface-variant); }
.md-field .md-help { font-size: .78rem; color: var(--md-on-surface-variant); padding: .3rem .95rem 0; display: block; }
.md-field .form-control[readonly] { background: var(--md-surface-container-high); opacity: .85; }

.md-switch { display: inline-flex; align-items: center; gap: .65rem; cursor: pointer; }
.md-switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.md-switch .track {
  width: 52px; height: 32px; border-radius: var(--md-r-full);
  background: var(--md-surface-container-highest);
  border: 2px solid var(--md-outline);
  position: relative; transition: background-color .2s var(--md-ease), border-color .2s var(--md-ease);
}
.md-switch .track::after {
  content: ""; position: absolute; left: 4px; top: 4px; width: 20px; height: 20px;
  border-radius: 50%; background: var(--md-outline);
  transition: transform .22s var(--md-ease), background-color .2s var(--md-ease), width .2s, height .2s;
}
.md-switch input:checked + .track { background: var(--md-primary); border-color: var(--md-primary); }
.md-switch input:checked + .track::after { transform: translateX(20px); background: var(--md-on-primary); }

/* -------------------------------------------------------------- 13. Tables */
.md-table { width: 100%; border-collapse: separate; border-spacing: 0; }
.md-table thead th {
  font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  color: var(--md-on-surface-variant);
  background: var(--md-surface-container);
  padding: .85rem 1rem; border-bottom: 1px solid var(--md-outline-variant);
  position: sticky; top: 0; z-index: 2; white-space: nowrap;
}
.md-table thead th a { color: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: .2rem; }
.md-table thead th a:hover { color: var(--md-primary); }
.md-table tbody td { padding: .85rem 1rem; border-bottom: 1px solid var(--md-outline-variant); vertical-align: middle; }
.md-table tbody tr { transition: background-color .15s var(--md-ease); }
.md-table tbody tr:hover { background: var(--md-surface-container-low); }
.md-table tbody tr:last-child td { border-bottom: none; }
.md-table .cell-clamp { max-width: 420px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; font-size: .875rem; color: var(--md-on-surface-variant); }
.md-code {
  font-family: "JetBrains Mono", "Cascadia Code", ui-monospace, "SF Mono", Consolas, monospace;
  font-size: .78rem;
  background: var(--md-surface-container-high);
  padding: .2rem .45rem; border-radius: var(--md-r-xs);
  color: var(--md-on-surface-variant);
}

/* ---------------------------------------------------------- 14. Admin shell */
.admin-shell { display: grid; grid-template-columns: 88px 1fr; min-height: 100vh; }
.md-rail {
  background: var(--md-surface-container);
  border-right: 1px solid var(--md-outline-variant);
  padding: 1rem .5rem;
  display: flex; flex-direction: column; align-items: center; gap: .35rem;
  position: sticky; top: 0; height: 100vh;
}
.md-rail-item {
  width: 100%; padding: .4rem 0 .35rem;
  display: flex; flex-direction: column; align-items: center; gap: .2rem;
  color: var(--md-on-surface-variant); text-decoration: none;
  font-size: .68rem; font-weight: 600; letter-spacing: .02em;
  border-radius: var(--md-r-md);
  transition: color .2s var(--md-ease);
}
.md-rail-item .rail-ico {
  width: 56px; height: 32px; display: grid; place-items: center;
  border-radius: var(--md-r-full);
  transition: background-color .2s var(--md-ease), color .2s var(--md-ease);
}
.md-rail-item:hover { color: var(--md-on-surface); }
.md-rail-item:hover .rail-ico { background: color-mix(in srgb, var(--md-on-surface) 9%, transparent); }
.md-rail-item.active { color: var(--md-on-surface); }
.md-rail-item.active .rail-ico { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.md-rail-item.active .material-symbols-rounded { font-variation-settings: 'FILL' 1; }

.md-stat-card {
  padding: 1.25rem 1.35rem;
  border-radius: var(--md-r-lg);
  display: flex; align-items: flex-start; gap: 1rem;
  border: 1px solid transparent; height: 100%;
}
.md-stat-card .sc-ico { width: 46px; height: 46px; border-radius: var(--md-r-md); display: grid; place-items: center; flex: none; }
.md-stat-card .sc-val { font-size: 1.9rem; font-weight: 700; line-height: 1.05; letter-spacing: -.02em; }
.md-stat-card .sc-key { font-size: .78rem; font-weight: 600; letter-spacing: .03em; opacity: .82; }
.sc-a { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.sc-a .sc-ico { background: color-mix(in srgb, var(--md-on-primary-container) 14%, transparent); }
.sc-b { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.sc-b .sc-ico { background: color-mix(in srgb, var(--md-on-secondary-container) 14%, transparent); }
.sc-c { background: var(--md-tertiary-container); color: var(--md-on-tertiary-container); }
.sc-c .sc-ico { background: color-mix(in srgb, var(--md-on-tertiary-container) 14%, transparent); }
.sc-d { background: var(--md-success-container); color: var(--md-on-success-container); }
.sc-d .sc-ico { background: color-mix(in srgb, var(--md-on-success-container) 14%, transparent); }

.md-meter { height: 8px; border-radius: var(--md-r-full); background: var(--md-surface-container-high); overflow: hidden; }
.md-meter > span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--md-primary), var(--md-secondary)); transition: width .8s var(--md-ease); }

/* -------------------------------------------------------------- 15. Misc */
/* Hidden state is driven by visibility/opacity, not by the slide alone: an
   empty snackbar is only ~29px tall, so translateY(150%) left a sliver of it
   showing above the bottom edge. */
.md-snackbar {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translate(-50%, 150%);
  background: var(--md-inverse-surface); color: var(--md-inverse-on-surface);
  border-radius: var(--md-r-xs); padding: .9rem 1.1rem;
  box-shadow: var(--md-e3); z-index: 1080;
  display: flex; align-items: center; gap: 1rem; max-width: min(92vw, 520px);
  font-size: .9rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform .34s var(--md-ease-emph), opacity .2s var(--md-ease), visibility 0s linear .34s;
}
.md-snackbar.show {
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: transform .34s var(--md-ease-emph), opacity .2s var(--md-ease), visibility 0s;
}
.md-snackbar a, .md-snackbar button { color: var(--md-primary); background: none; border: none; font-weight: 700; }

.md-empty { text-align: center; padding: clamp(2.5rem, 6vw, 4.5rem) 1rem; }
.md-empty .material-symbols-rounded { font-size: 64px; color: var(--md-outline-variant); }

.md-divider { height: 1px; background: var(--md-outline-variant); border: 0; margin: 1.25rem 0; opacity: 1; }

.md-pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .35rem; }
.md-pagination a, .md-pagination span {
  min-width: 40px; height: 40px; padding: 0 .6rem;
  display: inline-grid; place-items: center;
  border-radius: var(--md-r-full);
  color: var(--md-on-surface-variant); text-decoration: none; font-weight: 600; font-size: .875rem;
  transition: background-color .18s var(--md-ease), color .18s var(--md-ease);
}
.md-pagination a:hover { background: var(--md-surface-container-high); color: var(--md-on-surface); }
.md-pagination .current { background: var(--md-primary); color: var(--md-on-primary); }
.md-pagination .gap { pointer-events: none; opacity: .5; }

.md-alert {
  display: flex; align-items: flex-start; gap: .75rem;
  padding: .95rem 1.1rem; border-radius: var(--md-r-md);
  background: var(--md-secondary-container); color: var(--md-on-secondary-container);
  border: none; font-size: .92rem;
}
.md-alert-success { background: var(--md-success-container); color: var(--md-on-success-container); }
.md-alert-error { background: var(--md-error-container); color: var(--md-on-error-container); }
.md-alert .btn-close { margin-left: auto; filter: none; opacity: .55; }

.md-footer {
  border-top: 1px solid var(--md-outline-variant);
  background: var(--md-surface-container-low);
  padding: 2.5rem 0 2rem;
  margin-top: 4rem;
}
.md-footer a { color: var(--md-on-surface-variant); text-decoration: none; }
.md-footer a:hover { color: var(--md-primary); text-decoration: underline; }

/* Google Play badge — the artwork is a dark pill on transparency, so in dark
   mode it needs a faint outline to separate from the surface. */
.play-badge { display: inline-block; border-radius: 10px; transition: transform var(--md-dur) var(--md-ease), box-shadow var(--md-dur) var(--md-ease); }
.play-badge:hover { transform: translateY(-2px); box-shadow: var(--md-e2); text-decoration: none !important; }
.play-badge:focus-visible { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 3px; }
.play-badge img { display: block; width: 180px; height: auto; }
[data-bs-theme="dark"] .play-badge { box-shadow: 0 0 0 1px var(--md-outline-variant); }
[data-bs-theme="dark"] .play-badge:hover { box-shadow: 0 0 0 1px var(--md-outline), var(--md-e2); }

/* Skeleton */
.md-skel { background: linear-gradient(90deg, var(--md-surface-container) 25%, var(--md-surface-container-high) 37%, var(--md-surface-container) 63%); background-size: 400% 100%; animation: md-shimmer 1.4s infinite linear; border-radius: var(--md-r-sm); }
@keyframes md-shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* Reveal on scroll — gated on .js-reveal so content is never hidden without JS */
.js-reveal .reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s var(--md-ease), transform .5s var(--md-ease); }
.js-reveal .reveal.in { opacity: 1; transform: none; }

/* Auth page */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 2rem 1rem; position: relative; overflow: hidden; }
.auth-wrap::before {
  content: ""; position: absolute; inset: -20%;
  background:
    radial-gradient(40% 40% at 20% 20%, color-mix(in srgb, var(--md-primary) 30%, transparent), transparent 65%),
    radial-gradient(38% 38% at 80% 70%, color-mix(in srgb, var(--md-secondary) 28%, transparent), transparent 65%);
  will-change: transform;
  animation: md-aurora 26s ease-in-out infinite alternate;
}
.auth-card {
  position: relative; z-index: 1;
  width: min(100%, 430px);
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-r-xl);
  box-shadow: var(--md-e3);
  padding: clamp(1.75rem, 1.2rem + 2vw, 2.5rem);
}

/* Responsive */
@media (max-width: 991.98px) {
  .admin-shell { grid-template-columns: 1fr; }
  .md-rail {
    position: fixed; bottom: 0; top: auto; left: 0; right: 0;
    height: auto; width: 100%;
    flex-direction: row; justify-content: space-around;
    border-right: none; border-top: 1px solid var(--md-outline-variant);
    z-index: 1050; padding: .5rem .25rem calc(.5rem + env(safe-area-inset-bottom));
  }
  .md-rail .rail-brand { display: none; }
  .admin-main { padding-bottom: 92px !important; }
}
@media (max-width: 575.98px) {
  .term-grid { grid-template-columns: 1fr; }
  .md-appbar-inner { min-height: 60px; }
  .brand img { height: 32px; }
}

@media print {
  .md-appbar, .md-footer, .md-fab, .no-print { display: none !important; }
  body { background: #fff; }
  .md-panel, .term-hero { border-color: #ddd; box-shadow: none; }
}