/* ============================================================
   LinguaHaus – Design System & Styles
   Farben: Dunkelgrün + Creme | Schrift: Inter + Outfit
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ── CSS Custom Properties ─────────────────────────────── */
:root {
  /* Farben */
  --clr-bg:          #faf8f2;
  --clr-bg-alt:      #f3f0e8;
  --clr-surface:     #ffffff;
  --clr-surface-2:   #f7f5ee;

  --clr-green-900:   #0d3320;
  --clr-green-800:   #1a5c3a;
  --clr-green-700:   #1e6e45;
  --clr-green-600:   #2a8a5a;
  --clr-green-500:   #3aa86e;
  --clr-green-400:   #5dc68d;
  --clr-green-300:   #8ddcaf;
  --clr-green-100:   #d4f0e3;
  --clr-green-50:    #edfaf3;

  --clr-gold:        #c9943a;
  --clr-gold-light:  #f0c66a;

  --clr-text-primary:   #1a1a1a;
  --clr-text-secondary: #5a5a5a;
  --clr-text-muted:     #9a9a9a;
  --clr-text-inverse:   #ffffff;

  --clr-success:  #2ecc71;
  --clr-error:    #e74c3c;
  --clr-warning:  #f39c12;
  --clr-info:     #3498db;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;

  /* Radien */
  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  /* Schatten */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 16px rgba(26,92,58,.10), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 8px 32px rgba(26,92,58,.14), 0 4px 12px rgba(0,0,0,.08);
  --shadow-xl:  0 16px 48px rgba(26,92,58,.18), 0 8px 24px rgba(0,0,0,.10);
  --shadow-card: 0 2px 12px rgba(26,92,58,.08), 0 1px 4px rgba(0,0,0,.04);

  /* Typografie */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-md:   1.0625rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  1.875rem;
  --font-size-4xl:  2.25rem;

  /* Navigation */
  --nav-height: 64px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Glassmorphism */
  --glass-bg:     rgba(255,255,255,0.75);
  --glass-border: rgba(255,255,255,0.5);
  --glass-blur:   16px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--clr-text-primary);
  background-color: var(--clr-bg);
  min-height: 100%;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* Platz für untere Navigation auf Mobile */
  padding-bottom: env(safe-area-inset-bottom);
}

img, svg { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ── App Layout ──────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

.page {
  display: none;
  flex: 1;
  flex-direction: column;
  padding-bottom: calc(var(--nav-height) + 8px + env(safe-area-inset-bottom));
  animation: fadeIn 0.25s ease;
}
.page.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Top Header ──────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid rgba(26,92,58,0.08);
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.app-header .logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.app-header .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-600));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: var(--shadow-sm);
}
.app-header .logo-text {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
}

/* ── Bottom Navigation ───────────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: calc(var(--nav-height) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid rgba(26,92,58,0.10);
  box-shadow: 0 -4px 24px rgba(26,92,58,0.08);
  display: flex;
  align-items: stretch;
}

.nav-tabs {
  display: flex;
  flex: 1;
  align-items: stretch;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: var(--sp-2) var(--sp-1);
  background: none;
  border: none;
  color: var(--clr-text-muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-base);
  position: relative;
  min-width: 0;
  -webkit-tap-highlight-color: transparent;
}

.nav-tab .nav-icon {
  font-size: 22px;
  transition: transform var(--transition-slow);
  line-height: 1;
}

.nav-tab.active {
  color: var(--clr-green-700);
}
.nav-tab.active .nav-icon {
  transform: translateY(-2px) scale(1.1);
}
.nav-tab.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 36px;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-green-700), var(--clr-green-500));
  border-radius: 0 0 var(--radius-full) var(--radius-full);
}

/* ── Page Content Container ──────────────────────────── */
.page-content {
  flex: 1;
  padding: var(--sp-4) var(--sp-4) var(--sp-6);
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
}

.page-header {
  margin-bottom: var(--sp-6);
}
.page-title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--clr-green-900);
  letter-spacing: -0.02em;
}
.page-subtitle {
  font-size: var(--font-size-sm);
  color: var(--clr-text-secondary);
  margin-top: var(--sp-1);
}

/* ── Cards ───────────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(26,92,58,0.06);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card--clickable {
  cursor: pointer;
}
.card--clickable:active {
  transform: scale(0.98);
}
.card--green {
  background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-600));
  color: var(--clr-text-inverse);
  border-color: transparent;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  outline: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.btn:active { transform: scale(0.96); }

.btn--primary {
  background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-600));
  color: #fff;
  box-shadow: 0 4px 14px rgba(26,92,58,0.3);
}
.btn--primary:hover {
  box-shadow: 0 6px 20px rgba(26,92,58,0.4);
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--clr-green-50);
  color: var(--clr-green-800);
  border: 1.5px solid var(--clr-green-300);
}
.btn--secondary:hover {
  background: var(--clr-green-100);
}

.btn--ghost {
  background: transparent;
  color: var(--clr-green-700);
  border: 1.5px solid transparent;
}
.btn--ghost:hover {
  background: var(--clr-green-50);
  border-color: var(--clr-green-300);
}

.btn--danger {
  background: rgba(231,76,60,0.1);
  color: var(--clr-error);
}

.btn--icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--clr-surface);
  border: 1px solid rgba(26,92,58,0.1);
  color: var(--clr-green-700);
  font-size: 18px;
}
.btn--icon:hover { background: var(--clr-green-50); }

.btn--lg { padding: var(--sp-4) var(--sp-8); font-size: var(--font-size-lg); }
.btn--sm { padding: var(--sp-2) var(--sp-4); font-size: var(--font-size-sm); }
.btn--full { width: 100%; }

/* ── Progress Bar ────────────────────────────────────── */
.progress-bar {
  height: 8px;
  background: var(--clr-green-100);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-green-700), var(--clr-green-500));
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.34,1.56,0.64,1);
}

/* ── Badge / Chip ────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--sp-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.badge--green   { background: var(--clr-green-100); color: var(--clr-green-800); }
.badge--gold    { background: rgba(201,148,58,0.15); color: var(--clr-gold); }
.badge--sample  { background: rgba(52,152,219,0.1); color: var(--clr-info); }
.badge--level   { background: var(--clr-green-900); color: #fff; font-size: 10px; }

/* ── HOME PAGE ───────────────────────────────────────── */
.home-hero {
  background: linear-gradient(145deg, var(--clr-green-900) 0%, var(--clr-green-700) 60%, var(--clr-green-500) 100%);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
  color: #fff;
  margin-bottom: var(--sp-5);
  position: relative;
  overflow: hidden;
}
.home-hero::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 180px; height: 180px;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
}
.home-hero::after {
  content: '';
  position: absolute;
  bottom: -60px; left: 20px;
  width: 220px; height: 220px;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
}

.hero-greeting {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin: var(--sp-2) 0;
  letter-spacing: -0.02em;
}
.hero-subtitle { opacity: 0.85; font-size: var(--font-size-sm); }

.hero-stats {
  display: flex;
  gap: var(--sp-4);
  margin-top: var(--sp-5);
  position: relative;
  z-index: 1;
}
.hero-stat {
  flex: 1;
  text-align: center;
}
.hero-stat-value {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  line-height: 1;
}
.hero-stat-label {
  font-size: 10px;
  opacity: 0.75;
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.hero-divider {
  width: 1px;
  background: rgba(255,255,255,0.2);
  align-self: stretch;
}

.hero-progress {
  margin-top: var(--sp-5);
  position: relative;
  z-index: 1;
}
.hero-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  opacity: 0.8;
  margin-bottom: var(--sp-2);
}
.hero-progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.hero-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-gold-light), var(--clr-gold));
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.34,1.56,0.64,1);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--clr-green-900);
  margin-bottom: var(--sp-3);
}

.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.quick-action-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  border: 1.5px solid rgba(26,92,58,0.08);
  cursor: pointer;
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.quick-action-card:hover {
  border-color: var(--clr-green-400);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.quick-action-card:active { transform: scale(0.97); }

.quick-action-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}
.qa-icon--cards { background: var(--clr-green-50); }
.qa-icon--quiz  { background: rgba(201,148,58,0.1); }
.qa-icon--dict  { background: rgba(52,152,219,0.08); }
.qa-icon--hard  { background: rgba(231,76,60,0.08); }

.quick-action-title {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--clr-green-900);
}
.quick-action-desc {
  font-size: var(--font-size-xs);
  color: var(--clr-text-secondary);
}

.daily-goal-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  border: 1px solid rgba(26,92,58,0.08);
  margin-bottom: var(--sp-5);
}
.daily-goal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-3);
}
.daily-goal-info {
  font-size: var(--font-size-sm);
  color: var(--clr-text-secondary);
  margin-top: var(--sp-2);
}

/* ── FLASHCARDS ──────────────────────────────────────── */
.flashcard-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
  flex-wrap: wrap;
}
.flashcard-counter {
  font-size: var(--font-size-sm);
  color: var(--clr-text-secondary);
  font-weight: 500;
}

.flashcard-scene {
  perspective: 1200px;
  margin: var(--sp-4) auto;
  max-width: 500px;
  width: 100%;
  aspect-ratio: 5/3;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.34,1.2,0.64,1);
  border-radius: var(--radius-xl);
}
.flashcard-inner.flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
  text-align: center;
  overflow: hidden;
}

.flashcard-front {
  background: linear-gradient(145deg, var(--clr-green-800), var(--clr-green-700));
  box-shadow: var(--shadow-xl);
  color: #fff;
}
.flashcard-back {
  background: linear-gradient(145deg, var(--clr-surface), var(--clr-surface-2));
  transform: rotateY(180deg);
  box-shadow: var(--shadow-xl);
  border: 2px solid rgba(26,92,58,0.1);
}

.flashcard-lang-badge {
  position: absolute;
  top: var(--sp-3);
  left: var(--sp-4);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
  display: flex;
  align-items: center;
  gap: 4px;
}

.flashcard-category {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-4);
  font-size: 10px;
  padding: 2px var(--sp-2);
  border-radius: var(--radius-full);
}
.flashcard-front .flashcard-category {
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.85);
}
.flashcard-back .flashcard-category {
  background: var(--clr-green-100);
  color: var(--clr-green-800);
}

.flashcard-word {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.flashcard-front .flashcard-word { color: #fff; }
.flashcard-back .flashcard-word  { color: var(--clr-green-900); }

.flashcard-hint {
  margin-top: var(--sp-3);
  font-size: var(--font-size-sm);
  opacity: 0.6;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.flashcard-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--sp-3);
  margin: var(--sp-4) auto;
  max-width: 500px;
}

.flashcard-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  margin: var(--sp-3) 0;
}

.direction-toggle {
  display: flex;
  background: var(--clr-surface);
  border: 1px solid rgba(26,92,58,0.12);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}
.direction-btn {
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: none;
  background: none;
  color: var(--clr-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}
.direction-btn.active {
  background: var(--clr-green-800);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

/* ── QUIZ ────────────────────────────────────────────── */
.quiz-type-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}
.quiz-type-card {
  background: var(--clr-surface);
  border: 1.5px solid rgba(26,92,58,0.1);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  -webkit-tap-highlight-color: transparent;
}
.quiz-type-card:hover {
  border-color: var(--clr-green-500);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.quiz-type-card:active { transform: scale(0.97); }
.quiz-type-card.selected {
  border-color: var(--clr-green-700);
  background: var(--clr-green-50);
}
.quiz-type-icon { font-size: 32px; margin-bottom: var(--sp-2); }
.quiz-type-name { font-weight: 600; font-size: var(--font-size-sm); color: var(--clr-green-900); }

.quiz-container { max-width: 560px; margin: 0 auto; }

.quiz-question-card {
  background: linear-gradient(145deg, var(--clr-green-800), var(--clr-green-700));
  color: #fff;
  border-radius: var(--radius-xl);
  padding: var(--sp-6) var(--sp-5);
  margin-bottom: var(--sp-5);
  text-align: center;
  box-shadow: var(--shadow-xl);
}
.quiz-q-label {
  font-size: var(--font-size-xs);
  opacity: 0.7;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--sp-2);
}
.quiz-q-word {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.quiz-q-category {
  margin-top: var(--sp-2);
  font-size: var(--font-size-xs);
  opacity: 0.6;
}
.quiz-progress-bar {
  height: 4px;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  margin-top: var(--sp-4);
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--clr-gold-light);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.quiz-option {
  background: var(--clr-surface);
  border: 2px solid rgba(26,92,58,0.10);
  border-radius: var(--radius-lg);
  padding: var(--sp-4) var(--sp-5);
  font-size: var(--font-size-md);
  font-weight: 500;
  color: var(--clr-text-primary);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--clr-green-400);
  background: var(--clr-green-50);
  transform: translateX(4px);
}
.quiz-option:active:not(:disabled) { transform: scale(0.98); }
.quiz-option.correct {
  border-color: var(--clr-success);
  background: rgba(46,204,113,0.08);
  color: #1a7a44;
}
.quiz-option.wrong {
  border-color: var(--clr-error);
  background: rgba(231,76,60,0.08);
  color: #a93226;
}
.quiz-option:disabled { cursor: default; }
.quiz-option-letter {
  min-width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--clr-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--clr-text-secondary);
}
.quiz-option.correct .quiz-option-letter { background: var(--clr-success); color: #fff; }
.quiz-option.wrong .quiz-option-letter   { background: var(--clr-error); color: #fff; }

.quiz-feedback {
  margin-top: var(--sp-4);
  padding: var(--sp-4);
  border-radius: var(--radius-lg);
  text-align: center;
  font-weight: 600;
  animation: slideUp 0.3s ease;
}
.quiz-feedback.correct { background: rgba(46,204,113,0.12); color: #1a7a44; }
.quiz-feedback.wrong   { background: rgba(231,76,60,0.10);  color: #a93226; }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.quiz-type-input { padding: var(--sp-4) 0; }
.quiz-input-field {
  width: 100%;
  padding: var(--sp-4) var(--sp-5);
  border: 2px solid rgba(26,92,58,0.15);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-lg);
  font-weight: 500;
  background: var(--clr-surface);
  color: var(--clr-text-primary);
  outline: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  text-align: center;
}
.quiz-input-field:focus {
  border-color: var(--clr-green-600);
  box-shadow: 0 0 0 4px rgba(26,92,58,0.08);
}
.quiz-input-field.correct { border-color: var(--clr-success); }
.quiz-input-field.wrong   { border-color: var(--clr-error); }

.quiz-result-card {
  text-align: center;
  padding: var(--sp-8) var(--sp-6);
  animation: fadeIn 0.4s ease;
}
.quiz-result-emoji { font-size: 64px; margin-bottom: var(--sp-4); }
.quiz-result-title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--clr-green-900);
  margin-bottom: var(--sp-2);
}
.quiz-result-score {
  font-size: var(--font-size-xl);
  color: var(--clr-text-secondary);
  margin-bottom: var(--sp-6);
}
.quiz-result-stats {
  display: flex;
  justify-content: center;
  gap: var(--sp-6);
  margin-bottom: var(--sp-6);
}
.quiz-result-stat { text-align: center; }
.quiz-result-stat-value {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
}
.quiz-result-stat-label {
  font-size: var(--font-size-xs);
  color: var(--clr-text-secondary);
}
.stat-correct { color: var(--clr-success); }
.stat-wrong   { color: var(--clr-error); }

/* ── DICTIONARY ──────────────────────────────────────── */
.dict-search-wrapper {
  position: relative;
  margin-bottom: var(--sp-4);
}
.dict-search-icon {
  position: absolute;
  left: var(--sp-4);
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--clr-text-muted);
  pointer-events: none;
}
.dict-search-input {
  width: 100%;
  padding: var(--sp-4) var(--sp-4) var(--sp-4) 44px;
  border: 1.5px solid rgba(26,92,58,0.12);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  background: var(--clr-surface);
  color: var(--clr-text-primary);
  outline: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.dict-search-input:focus {
  border-color: var(--clr-green-600);
  box-shadow: 0 0 0 4px rgba(26,92,58,0.07);
}

.dict-filters {
  display: flex;
  gap: var(--sp-2);
  overflow-x: auto;
  padding-bottom: var(--sp-2);
  margin-bottom: var(--sp-4);
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.dict-filters::-webkit-scrollbar { display: none; }

.filter-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  border: 1.5px solid rgba(26,92,58,0.12);
  background: var(--clr-surface);
  color: var(--clr-text-secondary);
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}
.filter-chip:hover { border-color: var(--clr-green-400); color: var(--clr-green-700); }
.filter-chip.active {
  background: var(--clr-green-800);
  color: #fff;
  border-color: var(--clr-green-800);
}

.dict-results {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.dict-result-count {
  font-size: var(--font-size-sm);
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-2);
}

.word-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  border: 1px solid rgba(26,92,58,0.07);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  cursor: pointer;
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}
.word-card:hover {
  border-color: var(--clr-green-300);
  box-shadow: var(--shadow-md);
  transform: translateX(3px);
}
.word-card:active { transform: scale(0.98); }

.word-card-flags {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 32px;
}
.word-card-flag { font-size: 18px; }

.word-card-content { flex: 1; min-width: 0; }
.word-card-de {
  font-weight: 600;
  font-size: var(--font-size-base);
  color: var(--clr-green-900);
}
.word-card-sq {
  font-size: var(--font-size-sm);
  color: var(--clr-text-secondary);
  margin-top: 1px;
}
.word-card-meta {
  display: flex;
  gap: var(--sp-1);
  margin-top: var(--sp-1);
  flex-wrap: wrap;
}
.word-card-actions {
  display: flex;
  gap: var(--sp-1);
  align-items: center;
}

/* ── PROGRESS PAGE ───────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}
.stat-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  border: 1px solid rgba(26,92,58,0.07);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card-icon { font-size: 32px; margin-bottom: var(--sp-2); }
.stat-card-value {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--clr-green-900);
}
.stat-card-label {
  font-size: var(--font-size-xs);
  color: var(--clr-text-muted);
  margin-top: 2px;
}
.stat-card--green { background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-600)); color: #fff; }
.stat-card--green .stat-card-value,
.stat-card--green .stat-card-label { color: #fff; }
.stat-card--green .stat-card-label { opacity: 0.8; }

.category-progress-list { display: flex; flex-direction: column; gap: var(--sp-3); }
.category-progress-item {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  border: 1px solid rgba(26,92,58,0.07);
}
.cat-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-2);
}
.cat-progress-name { font-weight: 600; font-size: var(--font-size-sm); color: var(--clr-green-900); }
.cat-progress-pct  { font-size: var(--font-size-xs); color: var(--clr-text-secondary); }

/* ── SETTINGS / IMPORT ───────────────────────────────── */
.settings-section { margin-bottom: var(--sp-6); }
.settings-section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--clr-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-3);
  padding: 0 var(--sp-1);
}
.settings-item {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  border: 1px solid rgba(26,92,58,0.07);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-bottom: var(--sp-2);
  -webkit-tap-highlight-color: transparent;
}
.settings-item:hover { background: var(--clr-green-50); }
.settings-item-icon { font-size: 24px; }
.settings-item-content { flex: 1; }
.settings-item-title { font-weight: 600; font-size: var(--font-size-sm); color: var(--clr-green-900); }
.settings-item-desc { font-size: var(--font-size-xs); color: var(--clr-text-muted); }
.settings-item-arrow { color: var(--clr-text-muted); font-size: 18px; }

.import-zone {
  border: 2px dashed rgba(26,92,58,0.25);
  border-radius: var(--radius-lg);
  padding: var(--sp-8) var(--sp-6);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--clr-green-50);
}
.import-zone:hover, .import-zone.drag-over {
  border-color: var(--clr-green-600);
  background: var(--clr-green-100);
}
.import-zone-icon { font-size: 48px; margin-bottom: var(--sp-3); }
.import-zone-title { font-weight: 600; color: var(--clr-green-800); font-size: var(--font-size-md); }
.import-zone-desc { font-size: var(--font-size-sm); color: var(--clr-text-secondary); margin-top: var(--sp-1); }

/* ── MODALS ──────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: none;
  align-items: flex-end;
  justify-content: center;
  padding: var(--sp-4);
  animation: fadeIn 0.2s ease;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--clr-surface);
  border-radius: var(--radius-xl) var(--radius-xl) var(--sp-4) var(--sp-4);
  padding: var(--sp-6) var(--sp-5);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.35s cubic-bezier(0.34,1.2,0.64,1);
}
.modal-handle {
  width: 40px;
  height: 4px;
  background: var(--clr-bg-alt);
  border-radius: var(--radius-full);
  margin: 0 auto var(--sp-5);
}
.modal-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--clr-green-900);
  margin-bottom: var(--sp-5);
  text-align: center;
}
.modal-close {
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  background: var(--clr-bg-alt);
  border: none;
  border-radius: var(--radius-full);
  width: 32px;
  height: 32px;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-secondary);
}

/* ── TOAST NOTIFICATIONS ─────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--sp-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  pointer-events: none;
  width: calc(100% - var(--sp-8));
  max-width: 400px;
}
.toast {
  background: var(--clr-green-900);
  color: #fff;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  animation: toastIn 0.35s cubic-bezier(0.34,1.2,0.64,1);
  text-align: center;
}
.toast.toast--success { background: var(--clr-success); }
.toast.toast--error   { background: var(--clr-error); }
.toast.toast--warning { background: var(--clr-warning); }
.toast.toast--info    { background: var(--clr-info); }
.toast.toast--exit    { animation: toastOut 0.3s ease forwards; }
@keyframes toastIn  {
  from { opacity: 0; transform: translateY(-16px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(-8px) scale(0.95); }
}

/* ── INSTALL BANNER ──────────────────────────────────── */
.install-banner {
  display: none;
  position: fixed;
  bottom: calc(var(--nav-height) + env(safe-area-inset-bottom) + var(--sp-3));
  left: var(--sp-4);
  right: var(--sp-4);
  z-index: 300;
  background: linear-gradient(135deg, var(--clr-green-800), var(--clr-green-700));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.4s cubic-bezier(0.34,1.2,0.64,1);
}
.install-banner.show { display: flex; align-items: center; gap: var(--sp-3); }
.install-banner-text { flex: 1; }
.install-banner-title { font-weight: 700; font-size: var(--font-size-sm); }
.install-banner-desc  { font-size: var(--font-size-xs); opacity: 0.8; margin-top: 2px; }
.install-banner-close {
  background: none; border: none; color: rgba(255,255,255,0.7);
  font-size: 20px; cursor: pointer; padding: 0;
}

/* ── EMPTY & LOADING STATES ──────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--sp-12) var(--sp-6);
  color: var(--clr-text-secondary);
}
.empty-state-icon { font-size: 64px; margin-bottom: var(--sp-4); opacity: 0.5; }
.empty-state-title { font-weight: 600; font-size: var(--font-size-lg); margin-bottom: var(--sp-2); }
.empty-state-desc { font-size: var(--font-size-sm); }

.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-12);
}
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--clr-green-100);
  border-top-color: var(--clr-green-700);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── SAMPLE DATA NOTICE ──────────────────────────────── */
.sample-notice {
  background: rgba(52,152,219,0.08);
  border: 1px solid rgba(52,152,219,0.2);
  border-radius: var(--radius-lg);
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
  font-size: var(--font-size-sm);
  color: var(--clr-info);
}
.sample-notice-icon { font-size: 20px; }

/* ── SCROLLBAR CUSTOM ────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--clr-green-300);
  border-radius: var(--radius-full);
}

/* ── DESKTOP LAYOUT ──────────────────────────────────── */
@media (min-width: 768px) {
  .page-content { padding: var(--sp-8) var(--sp-6) var(--sp-8); }

  .quick-actions { grid-template-columns: repeat(4, 1fr); }

  .bottom-nav {
    top: 0;
    bottom: auto;
    height: auto;
    border-top: none;
    border-bottom: 1px solid rgba(26,92,58,0.10);
    box-shadow: 0 4px 24px rgba(26,92,58,0.06);
    padding-bottom: 0;
  }
  .nav-tabs { justify-content: center; gap: var(--sp-2); }
  .nav-tab {
    flex: 0 1 auto;
    flex-direction: row;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-5);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
  }
  .nav-tab .nav-icon { font-size: 18px; }
  .nav-tab.active::before {
    top: auto; bottom: 0;
    left: var(--sp-4); right: var(--sp-4);
    transform: none;
    width: auto;
    height: 3px;
  }
  .nav-tab.active .nav-icon { transform: none; }

  .page {
    padding-bottom: var(--sp-6);
    padding-top: var(--nav-height);
  }
  .app-header { position: static; }
  #app { flex-direction: column; }

  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .quiz-type-selector { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1024px) {
  .page-content { max-width: 800px; }
}

/* ── UTILITIES ───────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}
.text-center { text-align: center; }
.text-right  { text-align: right; }
.flex        { display: flex; }
.flex-col    { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.mt-2  { margin-top: var(--sp-2); }
.mt-3  { margin-top: var(--sp-3); }
.mt-4  { margin-top: var(--sp-4); }
.mb-4  { margin-bottom: var(--sp-4); }
.mb-5  { margin-bottom: var(--sp-5); }
.hidden { display: none !important; }
.w-full { width: 100%; }