@import url("https://fonts.googleapis.com/css2?family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&family=Source+Sans+Pro:wght@400;600;700&display=swap");

/* Color and type tokens straight from the LuHi Brand Standards (v2025):
   LuHi Purple #582D83, Jet #303030, Grey X11 #BBBCBC, Cultured #F5F4F6,
   plus the secondary set (Thistle/Wisteria/Ultra Violet/Parachute Purple/
   Russian Violet) used only as accents, never as a substitute for purple. */
:root {
  --purple: #582D83;
  --ink: #303030;
  --grey: #BBBCBC;
  --cultured: #F5F4F6;
  --thistle: #D1C9E6;
  --wisteria: #B8A7D6;
  --ultraviolet: #7566A0;
  --parachute: #3F2A56;
  --russianviolet: #2E1A47;

  --bg: var(--cultured);
  --card: #ffffff;
  --text: var(--ink);
  --muted: #726f7b; /* a grey biased toward the purple accent, not a raw grey */
  --accent: var(--purple);
  --accent-hover: var(--parachute);
  --accent-ink: #ffffff;
  --border: var(--grey);
  --focus: var(--ultraviolet);
  --danger: #9c3a3a;
  --danger-border: #c98a8a;
  --radius: 10px;
  --serif: 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --sans: 'Source Sans Pro', -apple-system, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--ink);
    --card: #3d3a40;
    --text: #F5F4F6;
    --muted: #b9b2c4;
    --accent-ink: #ffffff;
    --border: #5b5762;
    --focus: var(--thistle);
    --danger: #e69a9a;
    --danger-border: #7a4a4a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--serif);
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

h1 { font-family: var(--serif); font-style: italic; font-weight: 700; font-size: 1.6rem; margin-bottom: 4px; text-wrap: balance; }
h2 { font-family: var(--serif); font-style: italic; font-weight: 600; font-size: 1.2rem; margin: 28px 0 12px; }
p.subtitle { color: var(--muted); margin-top: 0; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.topbar-title { display: flex; align-items: center; gap: 12px; }
.brand-mark { height: 38px; width: auto; flex-shrink: 0; }

/* Logo (every page) and the home-page title link back to index.html. Looks
   like plain branding, not a link — override the generic .topbar a styling. */
.topbar a.brand-link { display: inline-flex; color: inherit; font: inherit; }
.topbar a.brand-link:hover { text-decoration: none; opacity: 0.8; }

.topbar a { color: var(--ultraviolet); text-decoration: none; font-family: var(--sans); font-weight: 600; font-size: 0.9rem; }
.topbar a:hover { text-decoration: underline; }
@media (prefers-color-scheme: dark) { .topbar a { color: var(--thistle); } }

/* Nav links styled as small, clearly-clickable button pills rather than
   plain colored text — plain links tested as too easy to miss. Compact
   padding/font-size keeps the topbar from growing taller than a single row. */
.topbar-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.topbar-nav a {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: 0.82rem;
  padding: 7px 12px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.topbar-nav a:hover {
  text-decoration: none;
  background: rgba(88,45,131,0.08);
  border-color: var(--accent);
  color: var(--accent);
}
@media (prefers-color-scheme: dark) {
  .topbar-nav a:hover { background: rgba(209,201,230,0.1); border-color: var(--thistle); color: var(--thistle); }
}

button, .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  background: var(--accent);
  color: var(--accent-ink);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  padding: 9px 16px;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button.secondary, .btn.secondary { background: transparent; color: var(--text); border-color: var(--border); }
button.secondary:hover { background: rgba(88,45,131,0.07); border-color: var(--text); }
button.danger { background: transparent; color: var(--danger); border-color: var(--danger-border); }
button.danger:hover { background: rgba(156,58,58,0.08); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--focus); outline-offset: 2px;
}

input[type="text"], input[type="password"], input[type="email"], select {
  font-family: var(--sans);
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  font-size: 0.95rem;
  width: 100%;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}

.collection-tile {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  font-family: var(--serif);
  font-style: italic;
  font-weight: 700;
  transition: box-shadow 0.15s, transform 0.15s;
}
.collection-tile:hover { box-shadow: 0 4px 16px rgba(88,45,131,0.14); transform: translateY(-1px); }
.collection-tile.all { background: var(--accent); border-top-color: var(--accent); color: var(--accent-ink); }
.collection-tile small { display: block; font-family: var(--sans); font-weight: 400; font-style: normal; color: var(--muted); margin-top: 4px; font-size: 0.8rem; }
.collection-tile.all small { color: rgba(255,255,255,0.85); }

.login-box { max-width: 360px; margin: 60px auto 0; text-align: center; }
.login-box .brand-mark { height: 52px; margin-bottom: 4px; }
.login-box .card { text-align: left; }
.remember-me { display: flex; align-items: flex-start; gap: 8px; margin-top: 12px; font-family: var(--sans); font-size: 0.9rem; cursor: pointer; }
.remember-me input { width: auto; margin-top: 3px; }
.remember-me small { display: block; color: var(--muted); font-size: 0.8rem; margin-top: 2px; }
.logout-all { text-align: center; color: var(--muted); font-family: var(--sans); font-size: 0.85rem; margin-top: 28px; }
.error-msg { color: var(--danger); font-family: var(--sans); font-size: 0.9rem; margin-top: 8px; min-height: 1.2em; }

.flashcard { text-align: center; }
.flashcard .frame {
  display: inline-block;
  padding: 14px;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--thistle) 0%, transparent 70%);
}
@media (prefers-color-scheme: dark) {
  .flashcard .frame { background: linear-gradient(180deg, var(--russianviolet) 0%, transparent 70%); }
}
.flashcard img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  max-height: 380px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--cultured);
}
@supports (height: 1dvh) {
  .flashcard img { max-height: min(380px, 42dvh); }
}
.flashcard .name {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 16px;
  min-height: 1.6em;
}
.flashcard .progress { font-family: var(--sans); color: var(--muted); margin-bottom: 12px; font-size: 0.9rem; }
.flashcard .actions { display: flex; justify-content: center; gap: 10px; margin-top: 18px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tabs button {
  font-family: var(--serif); font-style: italic; font-weight: 600;
  background: none; color: var(--muted); border: none; border-radius: 0;
  border-bottom: 2px solid transparent; padding: 10px 16px;
}
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); background: none; }
.tabs button:hover { background: none; color: var(--accent-hover); }
@media (prefers-color-scheme: dark) {
  .tabs button.active { color: var(--thistle); border-bottom-color: var(--thistle); }
  .tabs button:hover { color: var(--thistle); }
}

.roster-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
.roster-item { text-align: center; font-family: var(--sans); }
.roster-item img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--border); background: var(--cultured); }
.roster-item .name { font-size: 0.85rem; margin: 6px 0 4px; }
/* "In your 9th period" line under a home-page search result. */
.student-decks { font-family: var(--sans); font-weight: 600; margin: 10px 0 0; }

.import-page-status { display: flex; align-items: center; gap: 10px; padding: 6px 0; color: var(--muted); font-family: var(--sans); font-size: 0.9rem; }
.warn { color: #8a5a1f; font-family: var(--sans); font-size: 0.85rem; }
@media (prefers-color-scheme: dark) { .warn { color: #d9a45c; } }

.duplicate-group h4 { font-family: var(--serif); font-style: italic; margin: 0 0 10px; }
.mode-choice { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; font-family: var(--sans); font-size: 0.9rem; }
.mode-choice label { display: flex; align-items: center; gap: 6px; }
.mode-choice input { width: auto; }
.duplicate-candidates { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
.duplicate-candidate { text-align: center; font-family: var(--sans); }
.duplicate-candidate img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--border); background: var(--cultured); }
.duplicate-candidate .name { font-size: 0.85rem; margin: 6px 0 4px; }
.duplicate-candidate label { display: flex; align-items: center; justify-content: center; gap: 5px; font-size: 0.8rem; }
.duplicate-candidate label input { width: auto; }
.duplicate-candidate .disambig-input { font-size: 0.85rem; padding: 6px 8px; }

.match-options { display: flex; flex-direction: column; gap: 8px; margin: 10px 0; }
.match-option { display: flex; align-items: flex-start; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; font-family: var(--sans); }
.match-option:hover { background: rgba(88,45,131,0.06); }
.match-option input { margin-top: 20px; width: auto; }
.match-option img { width: 48px; height: 48px; object-fit: cover; border-radius: 6px; border: 1px solid var(--border); background: var(--cultured); }

.deck-tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow 0.15s;
}
.deck-tile:hover { box-shadow: 0 4px 16px rgba(88,45,131,0.14); }
.deck-tile-link { text-decoration: none; color: var(--text); font-family: var(--serif); font-style: italic; font-weight: 700; text-align: center; }
.deck-tile-link small { display: block; font-family: var(--sans); font-weight: 400; font-style: normal; color: var(--muted); margin-top: 4px; font-size: 0.8rem; }
.deck-tile-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; font-family: var(--sans); }
.deck-tile-actions a, .deck-tile-actions button { font-family: var(--sans); font-style: normal; font-size: 0.8rem; padding: 6px 10px; }

.roster-item-selectable { cursor: pointer; display: block; }
.roster-item-selectable input { margin-bottom: 6px; width: auto; }

.match-row { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px; font-family: var(--sans); }
.match-row img { width: 40px; height: 40px; object-fit: cover; border-radius: 6px; border: 1px solid var(--border); background: var(--cultured); flex-shrink: 0; }
.match-row span { flex: 1; }

.user-row { display: flex; justify-content: space-between; align-items: center; gap: 14px; font-family: var(--sans); }
.user-row-email { font-weight: 600; }
.user-row-meta { color: var(--muted); font-size: 0.85rem; margin-top: 2px; }
.admin-badge { background: var(--accent); color: var(--accent-ink); font-family: var(--sans); font-size: 0.7rem; font-weight: 600; padding: 2px 7px; border-radius: 20px; vertical-align: middle; }

/* Tighten vertical rhythm on phones so a whole flashcard (and other
   single-screen views) fits without scrolling, instead of shrinking any
   one element drastically. */
@media (max-width: 480px) {
  .page { padding: 16px 16px 24px; }
  .topbar { margin-bottom: 12px; padding-bottom: 10px; gap: 10px; }
  .topbar h1 { font-size: 1.3rem; }
  .brand-mark { height: 30px; }
  .topbar-nav a { padding: 6px 10px; font-size: 0.76rem; }
  .card { padding: 14px; }
  .flashcard .progress { margin-bottom: 6px; }
  .flashcard .frame { padding: 8px; }
  .flashcard img { max-height: min(300px, 36vh); }
  @supports (height: 1dvh) {
    .flashcard img { max-height: min(300px, 36dvh); }
  }
  .flashcard .name { margin-top: 8px; font-size: 1.2rem; min-height: 1.4em; }
  .flashcard .actions { margin-top: 10px; gap: 8px; }
  .flashcard .actions + .actions { margin-top: 8px; }
}

.hidden { display: none !important; }
.spinner {
  width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.8s linear infinite; display: inline-block;
}
@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.2s; }
}
@keyframes spin { to { transform: rotate(360deg); } }