/* ============================================================
   APUSH Deck — flashcard-first study site
   ============================================================ */

:root {
  --bg: #0c0d14;
  --bg-2: #11121b;
  --surface: #161823;
  --surface-2: #1d1f2c;
  --surface-3: #262838;
  --border: #2a2d3f;
  --border-soft: #20222f;
  --text: #ecedf2;
  --text-dim: #a0a3b8;
  --text-muted: #6f7390;
  --accent: #ff6b6b;
  --accent-2: #ffa94d;
  --accent-3: #4ecdc4;
  --accent-4: #a78bfa;
  --accent-5: #38bdf8;
  --good: #4ade80;
  --bad: #f87171;
  --warn: #fbbf24;
  --shadow-1: 0 4px 12px rgba(0,0,0,.25);
  --shadow-2: 0 18px 40px rgba(0,0,0,.45);
  --radius: 14px;
  --radius-lg: 22px;
}

[data-theme="light"] {
  --bg: #f7f5f0;
  --bg-2: #efece4;
  --surface: #ffffff;
  --surface-2: #fbf9f4;
  --surface-3: #f0ede5;
  --border: #e2dcd0;
  --border-soft: #ece7da;
  --text: #1a1c28;
  --text-dim: #5a5e75;
  --text-muted: #8b8f9f;
  --shadow-2: 0 18px 40px rgba(20,20,30,.10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

.bg-gradient {
  position: fixed;
  inset: -200px;
  z-index: -2;
  background:
    radial-gradient(ellipse 800px 600px at 15% 0%, rgba(255,107,107,.18), transparent 60%),
    radial-gradient(ellipse 700px 500px at 85% 30%, rgba(78,205,196,.15), transparent 60%),
    radial-gradient(ellipse 600px 400px at 50% 100%, rgba(167,139,250,.15), transparent 60%);
  pointer-events: none;
}
[data-theme="light"] .bg-gradient {
  background:
    radial-gradient(ellipse 800px 600px at 15% 0%, rgba(255,107,107,.10), transparent 60%),
    radial-gradient(ellipse 700px 500px at 85% 30%, rgba(78,205,196,.10), transparent 60%),
    radial-gradient(ellipse 600px 400px at 50% 100%, rgba(167,139,250,.10), transparent 60%);
}

.bg-stars {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 23% 17%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 73% 88%, rgba(255,255,255,.3), transparent),
    radial-gradient(1px 1px at 47% 33%, rgba(255,255,255,.25), transparent),
    radial-gradient(1px 1px at 89% 12%, rgba(255,255,255,.35), transparent),
    radial-gradient(1px 1px at 12% 76%, rgba(255,255,255,.3), transparent);
  opacity: .5;
}
[data-theme="light"] .bg-stars { display: none; }

kbd {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .72rem;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--text-dim);
  box-shadow: 0 1px 0 var(--border);
}

/* TOP BAR */
.topbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 18px 32px;
  position: sticky;
  top: 0;
  background: rgba(12,13,20,.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  z-index: 50;
  border-bottom: 1px solid var(--border-soft);
}
[data-theme="light"] .topbar { background: rgba(247,245,240,.85); }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 6px 18px rgba(255,107,107,.35);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-title {
  font-family: 'Fraunces', serif;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -.01em;
  line-height: 1;
}
.brand-sub { font-size: .76rem; color: var(--text-dim); margin-top: 3px; }

.topnav { display: flex; gap: 4px; justify-self: center; background: var(--surface); padding: 5px; border-radius: 12px; border: 1px solid var(--border-soft); }
.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font: inherit;
  font-weight: 600;
  font-size: .88rem;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all .15s;
}
.nav-btn:hover { color: var(--text); background: var(--surface-2); }
.nav-btn.active {
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 12px rgba(255,107,107,.30);
}

.topbar-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  width: 38px; height: 38px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
  border-radius: 10px;
  display: grid; place-items: center;
  cursor: pointer;
  transition: all .15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border); background: var(--surface-2); }
.t-moon { display: none; }
[data-theme="light"] .t-sun { display: none; }
[data-theme="light"] .t-moon { display: inline; }

.streak-pill {
  display: flex; align-items: center; gap: 4px;
  padding: 7px 12px;
  background: linear-gradient(135deg, rgba(255,169,77,.15), rgba(255,107,107,.10));
  border: 1px solid rgba(255,169,77,.3);
  border-radius: 999px;
  font-weight: 700;
  font-size: .85rem;
  color: var(--accent-2);
}

/* APP / VIEWS */
.app { max-width: 1240px; margin: 0 auto; padding: 32px; }
.view { display: none; animation: fadeUp .4s ease both; }
.view.active { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* HERO */
.hero {
  background: linear-gradient(135deg, rgba(255,107,107,.10), rgba(167,139,250,.08), rgba(78,205,196,.08));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 44px 40px 36px;
  margin-bottom: 36px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: -50%;
  background: radial-gradient(circle at 80% 20%, rgba(255,169,77,.18), transparent 50%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 780px; }
.hero-eyebrow {
  font-size: .75rem; font-weight: 700; color: var(--accent-2);
  letter-spacing: .14em; text-transform: uppercase;
}
.hero-title {
  font-family: 'Fraunces', serif;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.05;
  margin: 14px 0 16px;
}
.hero-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-style: italic;
}
.hero-sub {
  font-size: 1.05rem; color: var(--text-dim);
  max-width: 640px; line-height: 1.55;
  margin: 0 0 22px;
}
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; }

.btn-primary, .btn-primary-sm {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border: none;
  padding: 12px 22px;
  border-radius: 10px;
  font: inherit; font-weight: 700;
  font-size: .95rem;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(255,107,107,.30);
  transition: transform .15s, box-shadow .15s;
}
.btn-primary-sm { padding: 9px 18px; font-size: .87rem; }
.btn-primary:hover, .btn-primary-sm:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(255,107,107,.40); }
.btn-primary:active, .btn-primary-sm:active { transform: translateY(0); }

.btn-ghost, .btn-ghost-sm {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 11px 18px;
  border-radius: 10px;
  font: inherit; font-weight: 600;
  font-size: .92rem;
  cursor: pointer;
  transition: all .15s;
}
.btn-ghost-sm { padding: 8px 14px; font-size: .85rem; }
.btn-ghost:hover, .btn-ghost-sm:hover { background: var(--surface-2); border-color: var(--text-muted); }

.selection-summary {
  margin-top: 22px;
  padding: 14px 18px;
  background: rgba(0,0,0,.18);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  font-size: .9rem;
  color: var(--text-dim);
}
[data-theme="light"] .selection-summary { background: rgba(255,255,255,.6); }
.selection-summary strong { color: var(--text); }

/* UNIT PICKER */
.unit-section { margin-bottom: 32px; }
.section-head {
  display: flex; justify-content: space-between; align-items: end;
  gap: 20px; margin-bottom: 22px;
  flex-wrap: wrap;
}
.section-title {
  font-family: 'Fraunces', serif;
  font-size: 1.7rem; font-weight: 700;
  margin: 0;
  letter-spacing: -.02em;
}
.section-sub { color: var(--text-dim); margin: 4px 0 0; font-size: .95rem; }
.picker-hint { font-size: .82rem; color: var(--text-muted); }

.unit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.unit-card {
  position: relative;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  cursor: pointer;
  transition: all .18s ease;
  overflow: hidden;
  text-align: left;
  font: inherit;
  color: inherit;
}
.unit-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 4px;
  background: var(--unit-color, var(--accent));
  opacity: .8;
}
.unit-card:hover {
  transform: translateY(-2px);
  border-color: var(--unit-color, var(--accent));
  box-shadow: 0 12px 24px rgba(0,0,0,.25);
}
.unit-card.selected {
  border-color: var(--unit-color, var(--accent));
  background: linear-gradient(135deg, color-mix(in srgb, var(--unit-color, var(--accent)) 14%, var(--surface)), var(--surface));
  box-shadow:
    0 0 0 2px color-mix(in srgb, var(--unit-color, var(--accent)) 40%, transparent),
    0 12px 30px rgba(0,0,0,.30);
}

.unit-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.unit-num {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 800;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--unit-color, var(--accent));
  letter-spacing: -.02em;
}
.unit-checkbox {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--bg);
  display: grid; place-items: center;
  flex-shrink: 0;
  transition: all .18s;
}
.unit-card.selected .unit-checkbox {
  border-color: var(--unit-color, var(--accent));
  background: var(--unit-color, var(--accent));
}
.unit-checkbox svg { opacity: 0; transform: scale(.6); transition: all .18s; }
.unit-card.selected .unit-checkbox svg { opacity: 1; transform: scale(1); color: white; }

.unit-dates {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .7rem;
  color: var(--text-muted);
  letter-spacing: .04em;
  margin-top: 8px;
}
.unit-name {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.25;
  margin-top: 4px;
  letter-spacing: -.01em;
}
.unit-meta {
  display: flex; align-items: center; gap: 8px;
  margin-top: 14px;
  font-size: .82rem;
  color: var(--text-dim);
}
.unit-meta-bar {
  flex: 1;
  height: 4px;
  background: var(--border-soft);
  border-radius: 99px;
  overflow: hidden;
}
.unit-meta-bar-fill {
  height: 100%;
  background: var(--unit-color, var(--accent));
  border-radius: 99px;
  transition: width .4s;
}

/* MODE HEADERS */
.mode-header {
  display: flex; justify-content: space-between; align-items: end;
  gap: 24px; flex-wrap: wrap;
  margin-bottom: 28px;
}
.mode-eyebrow {
  font-size: .7rem; font-weight: 800;
  letter-spacing: .18em;
  color: var(--accent-2);
  margin-bottom: 4px;
}
.mode-title {
  font-family: 'Fraunces', serif;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin: 0;
  line-height: 1.1;
}
.mode-sub { color: var(--text-dim); margin: 6px 0 0; font-size: .98rem; }

.mode-controls {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
}
.ctrl {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 14px;
  font-size: .87rem;
  color: var(--text-dim);
  font-weight: 500;
  cursor: pointer;
}
.ctrl input[type="checkbox"] { accent-color: var(--accent); }
.ctrl select {
  background: transparent;
  border: none;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  outline: none;
}
.ctrl select option { background: var(--surface); color: var(--text); }
.search-input {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 16px;
  border-radius: 10px;
  font: inherit;
  font-size: .92rem;
  min-width: 280px;
  outline: none;
  transition: border-color .15s;
}
.search-input:focus { border-color: var(--accent); }

/* ============================================================
   FLASHCARDS
   ============================================================ */
.fc-stage { max-width: 880px; margin: 0 auto; }
.fc-progress-wrap { margin-bottom: 22px; }
.fc-progress-text {
  display: flex; justify-content: space-between;
  font-size: .85rem; font-weight: 600; color: var(--text-dim);
  margin-bottom: 7px;
}
.fc-progress-text .muted { font-weight: 500; color: var(--text-muted); }
.fc-progress-bar {
  height: 5px;
  background: var(--surface-2);
  border-radius: 99px;
  overflow: hidden;
}
#fc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%;
  border-radius: 99px;
  transition: width .35s ease;
}

.fc-card-wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
}
.fc-arrow {
  width: 52px; height: 52px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 1.7rem;
  cursor: pointer;
  font-weight: 600;
  transition: all .15s;
  line-height: 1;
}
.fc-arrow:hover { color: var(--text); border-color: var(--accent); transform: scale(1.05); }

.fc-card {
  perspective: 1500px;
  height: 440px;
  cursor: pointer;
  user-select: none;
}
.fc-inner {
  position: relative;
  width: 100%; height: 100%;
  transition: transform .55s cubic-bezier(.45,.05,.25,1);
  transform-style: preserve-3d;
}
.fc-card.flipped .fc-inner { transform: rotateY(180deg); }

.fc-face {
  position: absolute; inset: 0;
  border-radius: 22px;
  padding: 38px 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex; flex-direction: column;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: 0 24px 48px rgba(0,0,0,.32), 0 0 0 1px rgba(255,255,255,.02) inset;
}
.fc-front {
  background:
    radial-gradient(circle at 0% 0%, rgba(255,107,107,.10), transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(255,169,77,.06), transparent 50%),
    var(--surface);
}
.fc-back {
  transform: rotateY(180deg);
  background:
    radial-gradient(circle at 100% 0%, rgba(78,205,196,.10), transparent 50%),
    radial-gradient(circle at 0% 100%, rgba(167,139,250,.08), transparent 50%),
    var(--surface);
}

.fc-corner-tl, .fc-corner-tr {
  position: absolute; top: 22px;
  display: flex; align-items: center; gap: 6px;
}
.fc-corner-tl { left: 22px; }
.fc-corner-tr { right: 22px; }
.fc-side-label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .7rem; letter-spacing: .15em;
  color: var(--text-muted);
  font-weight: 700;
}
.fc-side-label.back { color: var(--accent-3); }
.fc-unit-tag {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px;
  font-size: .7rem; font-weight: 700; letter-spacing: .04em;
  color: white;
  background: var(--unit-color, var(--accent));
  border-radius: 99px;
}
.fc-unit-tag::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%; background: white; opacity: .8;
}

.fc-content {
  flex: 1;
  display: grid; place-items: center;
  text-align: center;
  padding: 20px 0;
}
.fc-content-back { padding: 30px 10px; }
.fc-term {
  font-family: 'Fraunces', serif;
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: -.02em;
  line-height: 1.15;
  max-width: 100%;
  word-break: break-word;
}
.fc-definition {
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  color: var(--text);
  line-height: 1.55;
  font-weight: 400;
  max-width: 580px;
}
.fc-bottom {
  text-align: center;
  font-size: .78rem;
  color: var(--text-muted);
}

.fc-actions {
  display: flex; justify-content: center; gap: 14px;
  margin-top: 22px;
}
.action-btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 12px 24px;
  border-radius: 12px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  font: inherit; font-weight: 700;
  font-size: .95rem;
  color: var(--text);
  cursor: pointer;
  transition: all .15s;
}
.action-key {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  background: var(--surface-2);
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.action-btn.forgot:hover { border-color: var(--bad); color: var(--bad); }
.action-btn.known:hover {
  border-color: var(--good);
  background: rgba(74, 222, 128, .12);
  color: var(--good);
}
.action-btn.forgot:hover .action-key { border-color: var(--bad); color: var(--bad); }
.action-btn.known:hover .action-key { border-color: var(--good); color: var(--good); }

.fc-keymap {
  text-align: center;
  color: var(--text-muted);
  font-size: .8rem;
  margin-top: 18px;
  line-height: 1.8;
}

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-stage {
  max-width: 800px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 36px;
  box-shadow: var(--shadow-2);
}
.quiz-stage.hidden { display: none; }
.quiz-topline {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .92rem; color: var(--text-dim);
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 12px;
}
.quiz-q-counter strong, .quiz-score strong { color: var(--text); font-size: 1.05rem; }
.quiz-streak {
  background: rgba(255,169,77,.12);
  color: var(--accent-2);
  border: 1px solid rgba(255,169,77,.3);
  padding: 4px 12px;
  border-radius: 99px;
  font-weight: 700;
  font-size: .85rem;
}
.quiz-progress-bar {
  height: 5px;
  background: var(--surface-2);
  border-radius: 99px;
  margin-bottom: 28px;
  overflow: hidden;
}
#quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%;
  border-radius: 99px;
  transition: width .35s;
}
.quiz-prompt-wrap { margin-bottom: 24px; }
.quiz-prompt-label {
  font-size: .82rem; font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 10px;
}
.quiz-prompt {
  font-family: 'Fraunces', serif;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
}
.quiz-choices { display: grid; gap: 10px; }
.quiz-choice {
  padding: 16px 20px;
  background: var(--surface-2);
  border: 1.5px solid var(--border-soft);
  border-radius: 12px;
  font: inherit;
  font-size: .98rem;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: all .15s;
  display: flex; align-items: center; gap: 14px;
}
.quiz-choice .choice-letter {
  width: 28px; height: 28px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: .8rem;
  font-weight: 700;
  color: var(--text-dim);
}
.quiz-choice:hover { border-color: var(--accent); background: var(--surface-3); }
.quiz-choice.correct {
  border-color: var(--good);
  background: rgba(74,222,128,.12);
  color: var(--good);
}
.quiz-choice.correct .choice-letter { background: var(--good); color: white; border-color: var(--good); }
.quiz-choice.wrong {
  border-color: var(--bad);
  background: rgba(248,113,113,.10);
  color: var(--bad);
}
.quiz-choice.wrong .choice-letter { background: var(--bad); color: white; border-color: var(--bad); }
.quiz-choice.disabled { pointer-events: none; opacity: .55; }
.quiz-feedback {
  margin-top: 16px;
  font-size: .9rem;
  color: var(--text-dim);
  min-height: 22px;
}
.quiz-feedback.correct { color: var(--good); }
.quiz-feedback.wrong { color: var(--bad); }

.quiz-results {
  max-width: 720px; margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  text-align: center;
}
.quiz-results.hidden { display: none; }
.qr-emoji { font-size: 3rem; margin-bottom: 8px; }
.qr-title {
  font-family: 'Fraunces', serif;
  font-size: 2rem; font-weight: 800;
  margin: 4px 0 8px;
  letter-spacing: -.02em;
}
.qr-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin: 22px auto 28px;
  max-width: 540px;
}
.qr-stat {
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 18px 12px;
}
.qr-stat-num {
  font-family: 'Fraunces', serif;
  font-size: 2rem; font-weight: 800;
  color: var(--accent-2);
  letter-spacing: -.02em;
}
.qr-stat-label { font-size: .8rem; color: var(--text-muted); margin-top: 4px; }
.qr-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }

/* ============================================================
   MATCH
   ============================================================ */
.match-stats { display: flex; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.ms-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  display: flex; flex-direction: column; gap: 2px;
  min-width: 100px;
}
.ms-label {
  font-size: .7rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: .1em; font-weight: 700;
}
.ms-val {
  font-family: 'Fraunces', serif;
  font-size: 1.25rem; font-weight: 700;
  color: var(--text);
}
.match-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.match-tile {
  padding: 14px 16px;
  min-height: 90px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  font-size: .9rem;
  line-height: 1.4;
  cursor: pointer;
  transition: all .18s;
  display: flex; align-items: center;
  font-family: inherit;
  color: var(--text);
  text-align: left;
}
.match-tile.term {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.05rem;
  background: linear-gradient(135deg, rgba(255,107,107,.10), var(--surface));
}
.match-tile:hover { border-color: var(--accent); transform: translateY(-2px); }
.match-tile.selected {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(255,107,107,.20), rgba(255,169,77,.10));
  box-shadow: 0 0 0 2px rgba(255,107,107,.30);
}
.match-tile.matched {
  opacity: 0;
  pointer-events: none;
  transform: scale(.85);
  transition: all .35s ease;
}
.match-tile.miss { animation: shake .35s; border-color: var(--bad); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.match-result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  text-align: center;
  margin-top: 20px;
}
.match-result.hidden { display: none; }

/* ============================================================
   BROWSE
   ============================================================ */
.browse-list { display: grid; gap: 8px; }
.browse-item {
  display: grid;
  grid-template-columns: auto 1fr 2fr auto;
  gap: 18px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  align-items: center;
  transition: all .12s;
}
.browse-item:hover { border-color: var(--border); background: var(--surface-2); }
.bi-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; font-weight: 700; color: white;
  padding: 3px 8px; border-radius: 6px;
  background: var(--unit-color, var(--accent));
}
.bi-term {
  font-family: 'Fraunces', serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.005em;
}
.bi-def { color: var(--text-dim); font-size: .9rem; line-height: 1.45; }
.bi-status {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  transition: all .15s;
  color: var(--text-muted);
}
.bi-status.mastered {
  background: var(--good);
  border-color: var(--good);
  color: white;
}
.bi-empty {
  text-align: center;
  padding: 50px 20px;
  color: var(--text-muted);
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 30px;
  color: var(--text-muted);
  font-size: .82rem;
  border-top: 1px solid var(--border-soft);
  margin-top: 40px;
  display: flex; justify-content: center; gap: 30px;
  flex-wrap: wrap;
}
.link-btn {
  background: none; border: none;
  color: var(--text-muted);
  font: inherit; font-size: .82rem;
  cursor: pointer;
  text-decoration: underline;
}
.link-btn:hover { color: var(--bad); }

mark {
  background: rgba(255,169,77,.4);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

/* RESPONSIVE */
@media (max-width: 820px) {
  .topbar { grid-template-columns: 1fr auto; padding: 14px 18px; }
  .topnav { grid-column: 1 / -1; justify-self: stretch; overflow-x: auto; }
  .nav-btn { padding: 8px 12px; font-size: .82rem; }
  .app { padding: 20px; }
  .hero { padding: 30px 22px 26px; }
  .fc-card { height: 380px; }
  .fc-face { padding: 28px 22px; }
  .fc-arrow { width: 42px; height: 42px; font-size: 1.3rem; }
  .browse-item { grid-template-columns: auto 1fr auto; }
  .browse-item .bi-def { display: none; }
}