/* =============================================
   CHIFFRES EN LETTRES — styles.css
   Design: warm parchment + deep navy + gold
   Fonts: Fraunces (headings) + Outfit (body)
   ============================================= */

/* ── CSS VARIABLES ── */
:root {
  --bg:          #F8F4EC;
  --bg-alt:      #EFE9DC;
  --surface:     #FFFFFF;
  --surface-2:   #FAF7F2;
  --primary:     #1E3A5F;
  --primary-hover:#163050;
  --accent:      #C8973A;
  --accent-light:#F5E6C8;
  --success:     #2D6E4E;
  --success-bg:  #D4EDE2;
  --error:       #B5372A;
  --error-bg:    #F8DDD9;
  --text:        #1A1F2E;
  --text-muted:  #6B6A78;
  --border:      #DDD8CE;
  --shadow:      0 2px 16px rgba(30, 58, 95, 0.10);
  --shadow-lg:   0 8px 40px rgba(30, 58, 95, 0.15);
  --radius:      14px;
  --radius-sm:   8px;
  --transition:  0.22s ease;
  --font-head:   'Fraunces', serif;
  --font-body:   'Outfit', sans-serif;
}

[data-theme="dark"] {
  --bg:          #111318;
  --bg-alt:      #171B23;
  --surface:     #1C1F27;
  --surface-2:   #22263A;
  --primary:     #5B9BD5;
  --primary-hover:#7AB3E0;
  --accent:      #D4A843;
  --accent-light:#332A14;
  --success:     #3AAB6D;
  --success-bg:  #0D2E1C;
  --error:       #E05A4F;
  --error-bg:    #2E1010;
  --text:        #E4DDD0;
  --text-muted:  #9A99A6;
  --border:      #2E3244;
  --shadow:      0 2px 16px rgba(0,0,0,0.35);
  --shadow-lg:   0 8px 40px rgba(0,0,0,0.45);
}

/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: var(--font-body); }
input { font-family: var(--font-body); }
img, svg { display: block; }

/* ── UTILITY ── */
.hidden { display: none !important; }

.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* ── HEADER / NAV ── */
#navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition), border-color var(--transition);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.logo-symbol {
  color: var(--accent);
  font-size: 1.1rem;
}

.logo-text {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo-text em {
  font-style: italic;
  color: var(--accent);
  margin: 0 0.1em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1rem;
  flex: 1;
}

.nav-links a {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--accent-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.btn-pill {
  background: var(--accent-light);
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: all var(--transition);
}
.btn-pill:hover {
  background: var(--accent);
  color: white;
}

.btn-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.btn-icon:hover { color: var(--primary); border-color: var(--primary); }

[data-theme="light"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="dark"]  .icon-moon { display: none; }
[data-theme="dark"]  .icon-sun  { display: block; }

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-alt);
}
.nav-hamburger span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── MAIN LAYOUT ── */
#app {
  flex: 1;
  max-width: 780px;
  margin: 0 auto;
  width: 100%;
  padding: 2.5rem 1.5rem 4rem;
}

.page { display: none; animation: fadeUp 0.35s ease; }
.page.active { display: block; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── HOME PAGE ── */
.hero {
  text-align: center;
  padding: 3rem 1rem 2.5rem;
}

.hero-badge {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.25rem 1rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--primary);
  margin-bottom: 1rem;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
  display: block;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto;
  font-weight: 300;
}

/* Mode Cards */
.mode-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin: 2rem 0;
}

.mode-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.4rem;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-light), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.mode-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.mode-card:hover::before { opacity: 1; }
.mode-card.featured { border-color: var(--primary); box-shadow: var(--shadow); }

.card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
  color: white;
}
.converter-icon { background: var(--accent); }
.mcq-icon { background: var(--primary); }
.qa-icon { background: var(--success); }

.mode-card h2 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.mode-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }
.card-arrow {
  position: absolute;
  bottom: 1.2rem;
  right: 1.2rem;
  font-size: 1.1rem;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--transition);
}
.mode-card:hover .card-arrow { opacity: 1; transform: translateX(0); }

/* Home stats */
.home-stats {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.6rem;
  margin-top: 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.home-stats-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.home-stat-item { display: flex; flex-direction: column; gap: 0.15rem; }
.home-stat-num { font-family: var(--font-head); font-size: 1.4rem; color: var(--primary); font-weight: 700; }

/* ── PAGE HEADER ── */
.page-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.8rem;
}
.page-header h2 {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: all var(--transition);
}
.back-btn:hover { color: var(--primary); border-color: var(--primary); }

/* ── CONVERTER ── */
.converter-card {
  padding: 2rem;
}

.converter-input-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.converter-input {
  width: 100%;
  font-size: 2rem;
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--primary);
  background: var(--surface-2);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  outline: none;
  transition: border-color var(--transition);
  appearance: textfield;
  -moz-appearance: textfield;
}
.converter-input::-webkit-inner-spin-button,
.converter-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.converter-input:focus { border-color: var(--primary); }
.converter-input::placeholder { color: var(--text-muted); font-size: 1.3rem; font-weight: 300; }

.converter-btns {
  display: flex;
  gap: 0.75rem;
}

.result-box {
  margin-top: 1.5rem;
  background: var(--bg-alt);
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.2rem;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: border-color var(--transition), background var(--transition);
}
.result-box.has-result { border-style: solid; border-color: var(--accent); background: var(--accent-light); }

.result-text {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
  flex: 1;
  word-break: break-word;
}
.result-text.placeholder { color: var(--text-muted); font-style: italic; font-weight: 400; font-size: 0.95rem; font-family: var(--font-body); }

.btn-copy {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background: white;
  border: 1.5px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.9rem;
  white-space: nowrap;
  transition: all var(--transition);
}
.btn-copy:hover { background: var(--accent); color: white; }

.converter-hint {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

/* ── BUTTONS ── */
.btn-primary {
  background: var(--primary);
  color: white;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(30, 58, 95, 0.3); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  border: 1.5px solid var(--border);
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }

.btn-danger {
  background: var(--error);
  color: white;
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-danger:hover { filter: brightness(1.1); }

.btn-large { padding: 0.9rem 2.2rem; font-size: 1rem; }
.btn-start { width: 100%; justify-content: center; margin-top: 0.5rem; }

/* ── SETUP CARD ── */
.setup-card {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.setup-section h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.9rem;
  letter-spacing: -0.01em;
}

/* Difficulty grid */
.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
}

.diff-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  padding: 0.85rem 0.8rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}
.diff-btn:hover { border-color: var(--primary); background: var(--surface); }
.diff-btn.active { border-color: var(--primary); background: var(--primary); color: white; }
.diff-btn.active .diff-range { color: rgba(255,255,255,0.7); }
.diff-emoji { font-size: 1rem; margin-bottom: 0.1rem; }
.diff-label { font-size: 0.82rem; font-weight: 600; }
.diff-range { font-size: 0.7rem; color: var(--text-muted); }

/* Count grid */
.count-grid {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.count-btn {
  flex: 1;
  min-width: 60px;
  padding: 0.65rem 0.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
  text-align: center;
}
.count-btn:hover { border-color: var(--primary); color: var(--primary); }
.count-btn.active { border-color: var(--primary); background: var(--primary); color: white; }

.custom-wrap { margin-top: 0.75rem; }
.custom-input {
  width: 100%;
  max-width: 200px;
  padding: 0.55rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
  appearance: textfield;
  -moz-appearance: textfield;
}
.custom-input::-webkit-inner-spin-button,
.custom-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.custom-input:focus { border-color: var(--primary); }

/* Timer toggle */
.timer-toggle-row { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.75rem; }
.toggle-group {
  display: inline-flex;
  background: var(--bg-alt);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}
.toggle-btn {
  padding: 0.35rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}
.toggle-btn.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 1px 6px rgba(30,58,95,0.25);
}

.timer-config {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.timer-config label { font-size: 0.85rem; color: var(--text-muted); }

/* ── QUIZ TOP BAR ── */
.quiz-topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn-exit {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  flex-shrink: 0;
  transition: all var(--transition);
}
.btn-exit:hover { color: var(--error); border-color: var(--error); }

.quiz-progress-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.progress-track {
  height: 7px;
  background: var(--bg-alt);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px;
  transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  width: 0%;
}

.progress-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.quiz-timer-badge {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--accent-light);
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  white-space: nowrap;
  transition: all var(--transition);
}
.quiz-timer-badge.warning { color: var(--error); background: var(--error-bg); border-color: var(--error); }

/* ── QUIZ CARD ── */
.quiz-card {
  padding: 2rem;
}

.q-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.q-number {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
  line-height: 1;
}

.q-word {
  font-family: var(--font-head);
  font-size: clamp(1.2rem, 3.5vw, 1.8rem);
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.02em;
  line-height: 1.4;
  margin-bottom: 2rem;
  padding: 1.2rem;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent);
  word-break: break-word;
}

/* MCQ Choices */
.choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.choice-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  cursor: pointer;
  text-align: left;
  font-size: 0.9rem;
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.4;
  transition: all var(--transition);
  word-break: break-word;
  min-height: 60px;
}
.choice-btn:hover:not(:disabled) { border-color: var(--primary); background: var(--surface); transform: translateY(-1px); }
.choice-btn:disabled { cursor: default; }
.choice-btn.correct { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.choice-btn.wrong   { border-color: var(--error);   background: var(--error-bg);   color: var(--error); }
.choice-btn.revealed { border-color: var(--success); background: var(--success-bg); color: var(--success); }

.choice-letter {
  width: 26px; height: 26px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
}
.choice-btn:hover:not(:disabled) .choice-letter { border-color: var(--primary); color: var(--primary); }
.choice-btn.correct .choice-letter { background: var(--success); border-color: var(--success); color: white; }
.choice-btn.wrong   .choice-letter { background: var(--error);   border-color: var(--error);   color: white; }
.choice-btn.revealed .choice-letter { background: var(--success); border-color: var(--success); color: white; }

/* QA Input */
.qa-input-wrap {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.qa-input {
  flex: 1;
  min-width: 140px;
  padding: 0.75rem 1rem;
  font-size: 1.4rem;
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--primary);
  background: var(--surface-2);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
  appearance: textfield;
  -moz-appearance: textfield;
}
.qa-input::-webkit-inner-spin-button,
.qa-input::-webkit-outer-spin-button { -webkit-appearance: none; }
.qa-input:focus { border-color: var(--primary); }
.qa-input.correct { border-color: var(--success); background: var(--success-bg); }
.qa-input.wrong   { border-color: var(--error);   background: var(--error-bg); }

/* Feedback bar */
.feedback-bar {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  margin-bottom: 1rem;
  display: none;
}
.feedback-bar.show { display: block; animation: feedbackIn 0.25s ease; }
.feedback-bar.correct-fb { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }
.feedback-bar.wrong-fb   { background: var(--error-bg);   color: var(--error);   border: 1px solid var(--error); }
@keyframes feedbackIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Quiz actions */
.quiz-actions { display: flex; justify-content: flex-end; }
.btn-next { padding: 0.75rem 2rem; }

/* ── RESULTS ── */
.results-card {
  padding: 2.5rem 2rem;
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.results-title {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

/* Animated ring */
.score-ring-wrap {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 2rem;
}
.score-ring {
  width: 140px; height: 140px;
  transform: rotate(-90deg);
}
.ring-bg { fill: none; stroke: var(--bg-alt); stroke-width: 10; }
.ring-fill {
  fill: none;
  stroke: var(--primary);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.34, 1.1, 0.64, 1);
}
.score-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.score-pct {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}
.score-sub { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.8rem;
}
.result-stat {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 0.75rem;
}
.stat-icon { font-size: 1.1rem; margin-bottom: 0.3rem; }
.stat-val { font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; color: var(--text); }
.stat-key { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0.2rem; }
.correct-stat .stat-icon { color: var(--success); }
.correct-stat .stat-val  { color: var(--success); }
.wrong-stat .stat-icon   { color: var(--error); }
.wrong-stat .stat-val    { color: var(--error); }
.time-stat .stat-icon    { color: var(--accent); }

/* Mistakes review */
.mistakes-section {
  text-align: left;
  margin-bottom: 1.8rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.mistakes-section h3 {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  color: var(--error);
}
.mistakes-list { display: flex; flex-direction: column; gap: 0.5rem; }
.mistake-item {
  font-size: 0.82rem;
  padding: 0.5rem 0.75rem;
  background: var(--error-bg);
  border-radius: var(--radius-sm);
  color: var(--error);
  border-left: 3px solid var(--error);
}
.mistake-item strong { color: var(--text); display: block; }

.results-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── MODAL ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeOverlay 0.2s ease;
}
@keyframes fadeOverlay { from { opacity: 0; } to { opacity: 1; } }

.modal-box {
  max-width: 380px;
  width: 100%;
  padding: 2rem;
  text-align: center;
}
.modal-box p { font-size: 0.95rem; color: var(--text); margin-bottom: 1.5rem; line-height: 1.5; }
.modal-actions { display: flex; gap: 0.75rem; justify-content: center; }

/* ── FOOTER ── */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  margin-top: auto;
  transition: background var(--transition), border-color var(--transition);
}
.footer-inner {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}
.footer-legal { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; max-width: 480px; margin: 0 auto; }
.footer-dev { font-size: 0.8rem; color: var(--text-muted); }
.footer-dev a { color: var(--primary); font-weight: 500; }
.footer-dev a:hover { text-decoration: underline; }

/* ── MOBILE NAV ── */
@media (max-width: 700px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    flex-direction: column;
    gap: 0.25rem;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.7rem 1rem; font-size: 0.95rem; border-radius: var(--radius-sm); }
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  #app { padding: 1.5rem 1rem 3rem; }

  .mode-cards { grid-template-columns: 1fr; gap: 0.9rem; }
  .mode-card { padding: 1.3rem; }

  .difficulty-grid { grid-template-columns: repeat(2, 1fr); }

  .choices-grid { grid-template-columns: 1fr; }

  .results-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .result-stat { padding: 0.75rem 0.5rem; }
  .stat-val { font-size: 1.2rem; }
  .stat-key { font-size: 0.65rem; }

  .converter-card { padding: 1.4rem; }
  .quiz-card { padding: 1.4rem; }
  .setup-card { padding: 1.4rem; }
  .results-card { padding: 1.8rem 1.2rem; }

  .q-number { font-size: 2.8rem; }
  .q-word { font-size: 1.1rem; }

  .hero { padding: 2rem 0 1.5rem; }
}

@media (max-width: 400px) {
  .count-grid { gap: 0.4rem; }
  .count-btn { font-size: 0.82rem; padding: 0.55rem 0.4rem; }
  .difficulty-grid { grid-template-columns: 1fr 1fr; }
}

/* ── ANIMATION UTILITIES ── */
.pulse {
  animation: pulse 0.4s ease;
}
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.04); }
  100% { transform: scale(1); }
}

.shake {
  animation: shake 0.35s ease;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}