/* ===== Variables ===== */
:root {
  --bg: #F4F5F7;
  --surface: #FFFFFF;
  --surface-2: #F9FAFB;
  --primary: #1A1A1A;
  --accent: #FFCD00;
  --accent-dark: #E6B800;
  --danger: #CC0000;
  --danger-light: #FFF0F0;
  --warning: #E67700;
  --warning-light: #FFF8F0;
  --success: #2E7D32;
  --success-light: #F0FFF0;
  --info: #1565C0;
  --info-light: #EEF4FF;
  --text: #1A1A1A;
  --text-muted: #6B7280;
  --text-light: #9CA3AF;
  --border: #E5E7EB;
  --border-strong: #D1D5DB;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #111827;
  --surface: #1F2937;
  --surface-2: #111827;
  --primary: #F9FAFB;
  --text: #F9FAFB;
  --text-muted: #9CA3AF;
  --text-light: #6B7280;
  --border: #374151;
  --border-strong: #4B5563;
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.4);
  --danger-light: #2C1010;
  --warning-light: #2C1F00;
  --success-light: #0D2010;
  --info-light: #0D1A2C;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: var(--font); }
ul { list-style: none; }

/* ===== Header ===== */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
}
.flag { font-size: 1.25rem; }
#main-nav {
  display: flex;
  gap: .25rem;
  flex: 1;
}
.nav-link {
  padding: .4rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover { color: var(--text); background: var(--bg); }
.nav-link.active { color: var(--text); background: var(--accent); }
.header-actions {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-left: auto;
}
.header-stats {
  display: flex;
  gap: .75rem;
  font-size: .85rem;
  font-weight: 600;
}
#theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .3rem .5rem;
  font-size: 1rem;
  transition: background var(--transition);
}
#theme-toggle:hover { background: var(--bg); }

/* ===== Main Layout ===== */
#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  min-height: calc(100vh - 60px);
}

/* ===== Typography ===== */
h1 { font-size: 1.75rem; font-weight: 700; line-height: 1.2; }
h2 { font-size: 1.35rem; font-weight: 700; line-height: 1.3; }
h3 { font-size: 1.1rem; font-weight: 600; }
h4 { font-size: .95rem; font-weight: 600; }
p { line-height: 1.6; }

/* ===== Cards / Surfaces ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  border: none;
  transition: all var(--transition);
}
.btn:hover { filter: brightness(0.93); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: #fff; }
[data-theme="dark"] .btn-primary { background: var(--accent); color: #000; }
.btn-accent { background: var(--accent); color: #000; }
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border-strong);
  color: var(--text);
}
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: .35rem .75rem; font-size: .82rem; }
.btn-lg { padding: .75rem 1.5rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

/* ===== Badges / Pills ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: .2rem .55rem;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .03em;
}
.badge-a1 { background: #DBEAFE; color: #1E40AF; }
.badge-a2 { background: #D1FAE5; color: #065F46; }
.badge-b1 { background: #FEF3C7; color: #92400E; }

/* ===== Progress Bar ===== */
.progress-bar {
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width .4s ease;
}
.progress-fill.success { background: var(--success); }
.progress-fill.info { background: var(--info); }

/* ===== Section Headers ===== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

/* ===== Grid Layouts ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

/* ===== DASHBOARD ===== */
.dashboard { display: flex; flex-direction: column; gap: 1.5rem; }
.dashboard-hero {
  background: linear-gradient(135deg, #1A1A1A 0%, #333 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.hero-text h1 { color: #fff; margin-bottom: .5rem; }
.hero-text p { color: rgba(255,255,255,.7); margin-bottom: 1.25rem; }
.hero-badge {
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: .75rem;
  padding: .25rem .65rem;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: .5rem;
}
.hero-visual {
  font-size: 5rem;
  opacity: .8;
  flex-shrink: 0;
}
.dashboard-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.stat-card {
  padding: 1.25rem;
  text-align: center;
  border-radius: var(--radius);
}
.stat-value { font-size: 2rem; font-weight: 800; color: var(--text); }
.stat-label { font-size: .8rem; color: var(--text-muted); margin-top: .2rem; font-weight: 500; }
.dashboard-sections { display: grid; grid-template-columns: 2fr 1fr; gap: 1rem; }
.today-section { padding: 1.5rem; }
.today-section h3 { margin-bottom: 1rem; }
.due-card-preview {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: .5rem;
}
.due-word { font-weight: 700; font-size: 1.1rem; }
.due-count { font-size: .8rem; color: var(--text-muted); }
.quick-actions { display: flex; flex-direction: column; gap: .75rem; }
.quick-actions h3 { margin-bottom: .5rem; }
.activity-feed { padding: 1.5rem; }
.activity-item {
  display: flex;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .85rem;
}
.activity-item:last-child { border-bottom: none; }
.activity-icon { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: .85rem; }
.activity-text { color: var(--text-muted); }
.activity-text strong { color: var(--text); }
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: .5rem; }
.level-roadmap { padding: 1.5rem; }
.level-roadmap h3 { margin-bottom: 1.25rem; }
.roadmap-track {
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
}
.roadmap-level {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .35rem;
  flex: 1;
}
.roadmap-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2.5px solid var(--border);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 800;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}
.roadmap-circle.completed { background: var(--success); border-color: var(--success); color: #fff; }
.roadmap-circle.current { background: var(--accent); border-color: var(--accent-dark); color: #000; }
.roadmap-label { font-size: .7rem; color: var(--text-muted); font-weight: 600; }
.roadmap-line {
  flex: 1;
  height: 3px;
  background: var(--border);
  margin: 0 -2px;
  position: relative;
  top: -12px;
}
.roadmap-line.completed { background: var(--success); }

/* ===== FLASHCARDS ===== */
.flashcard-view { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; }
.flashcard-header {
  width: 100%;
  max-width: 600px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.session-progress-wrap { flex: 1; }
.session-progress-label {
  font-size: .82rem;
  color: var(--text-muted);
  margin-bottom: .35rem;
  display: flex;
  justify-content: space-between;
}
.card-wrap {
  perspective: 1200px;
  width: 100%;
  max-width: 560px;
  cursor: pointer;
  user-select: none;
}
.card-inner {
  position: relative;
  width: 100%;
  min-height: 280px;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}
.card-inner.flipped { transform: rotateY(180deg); }
.card-face {
  position: absolute;
  width: 100%;
  min-height: 280px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}
.card-back-face {
  transform: rotateY(180deg);
  background: var(--surface);
}
.card-category-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
}
.card-level-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
}
.card-german {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: .5rem;
  color: var(--text);
}
.card-pronunciation { font-size: 1rem; color: var(--text-muted); margin-bottom: 1rem; font-style: italic; }
.card-flip-hint { font-size: .8rem; color: var(--text-light); margin-top: 1.5rem; }
.card-english { font-size: 1.6rem; font-weight: 700; margin-bottom: 1rem; }
.card-example {
  font-size: .95rem;
  color: var(--text-muted);
  font-style: italic;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: .6rem 1rem;
  width: 100%;
  text-align: left;
  margin-bottom: .25rem;
}
.card-example-en { font-size: .85rem; color: var(--text-light); text-align: left; width: 100%; padding: 0 1rem; }
.rating-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .75rem;
  width: 100%;
  max-width: 560px;
}
.btn-rate {
  padding: .65rem .5rem;
  border: none;
  border-radius: var(--radius);
  font-size: .88rem;
  font-weight: 700;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
}
.btn-rate .rate-label { font-size: .7rem; opacity: .7; font-weight: 500; }
.btn-rate:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-again { background: var(--danger-light); color: var(--danger); border: 1.5px solid var(--danger); }
.btn-hard { background: var(--warning-light); color: var(--warning); border: 1.5px solid var(--warning); }
.btn-good { background: var(--success-light); color: var(--success); border: 1.5px solid var(--success); }
.btn-easy { background: var(--info-light); color: var(--info); border: 1.5px solid var(--info); }
.flashcard-hint {
  font-size: .82rem;
  color: var(--text-muted);
  text-align: center;
}
.session-complete {
  text-align: center;
  padding: 3rem 2rem;
  max-width: 480px;
}
.session-complete .big-icon { font-size: 4rem; margin-bottom: 1rem; }
.session-complete h2 { margin-bottom: .5rem; }
.session-complete p { color: var(--text-muted); margin-bottom: 1.5rem; }
.session-results { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; margin: 1.25rem 0; }
.result-item { text-align: center; padding: .75rem; background: var(--bg); border-radius: var(--radius-sm); }
.result-num { font-size: 1.5rem; font-weight: 800; }
.result-label { font-size: .72rem; color: var(--text-muted); margin-top: .1rem; }
.no-cards {
  text-align: center;
  padding: 3rem 2rem;
  max-width: 480px;
}
.no-cards .big-icon { font-size: 4rem; margin-bottom: 1rem; }
.next-review { font-size: .85rem; color: var(--text-muted); margin: 1rem 0; }
.flashcard-settings { display: flex; gap: .75rem; flex-wrap: wrap; }
.flashcard-setup {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: 560px;
  width: 100%;
  text-align: center;
  padding: 2rem;
}
.setup-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; width: 100%; }
.setup-stat { background: var(--bg); border-radius: var(--radius); padding: 1rem; }
.setup-stat .num { font-size: 1.5rem; font-weight: 800; }
.setup-stat .lbl { font-size: .75rem; color: var(--text-muted); margin-top: .2rem; }
.category-filter { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; }
.filter-chip {
  padding: .3rem .7rem;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.filter-chip.active { border-color: var(--accent-dark); background: var(--accent); color: #000; }

/* ===== LESSONS ===== */
.lessons-layout { display: grid; grid-template-columns: 260px 1fr; gap: 1.25rem; align-items: start; }
.lessons-sidebar { position: sticky; top: 76px; }
.lesson-list h3 { padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); font-size: .9rem; }
.lesson-group-label {
  padding: .5rem 1.25rem .25rem;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-light);
}
.lesson-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .65rem 1.25rem;
  font-size: .88rem;
  cursor: pointer;
  transition: background var(--transition);
  border-left: 3px solid transparent;
}
.lesson-item:hover { background: var(--bg); }
.lesson-item.active { background: var(--bg); border-left-color: var(--accent); font-weight: 600; }
.lesson-item.completed .lesson-icon { color: var(--success); }
.lesson-icon { font-size: .9rem; width: 18px; flex-shrink: 0; }
.lesson-content { padding: 1.75rem; }
.lesson-title { margin-bottom: .35rem; }
.lesson-meta { display: flex; align-items: center; gap: .75rem; margin-bottom: 1.5rem; color: var(--text-muted); font-size: .82rem; }
.lesson-body { max-width: 680px; }
.lesson-body h3 { margin: 1.5rem 0 .75rem; color: var(--text); }
.lesson-body h4 { margin: 1.25rem 0 .5rem; color: var(--text-muted); text-transform: uppercase; font-size: .75rem; letter-spacing: .06em; }
.lesson-body p { margin-bottom: .9rem; color: var(--text); line-height: 1.7; }
.lesson-body ul { margin: .5rem 0 .9rem 1.25rem; list-style: disc; }
.lesson-body ul li { margin-bottom: .3rem; color: var(--text); line-height: 1.6; }
.example-block {
  background: var(--bg);
  border-left: 3px solid var(--accent-dark);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: .75rem 1rem;
  margin: .75rem 0;
  font-size: .9rem;
}
.example-de { font-weight: 600; margin-bottom: .2rem; }
.example-en { color: var(--text-muted); font-style: italic; font-size: .85rem; }
.grammar-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  margin: .75rem 0 1rem;
}
.grammar-table th {
  background: var(--bg);
  padding: .5rem .75rem;
  text-align: left;
  font-weight: 700;
  border: 1px solid var(--border);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.grammar-table td {
  padding: .5rem .75rem;
  border: 1px solid var(--border);
}
.grammar-table tr:hover td { background: var(--surface-2); }
.highlight-de { color: var(--danger); font-weight: 600; }
.highlight-case { color: var(--info); font-weight: 600; }
.tip-box {
  background: var(--info-light);
  border: 1px solid var(--info);
  border-radius: var(--radius-sm);
  padding: .85rem 1rem;
  margin: .75rem 0;
  font-size: .88rem;
}
.tip-box strong { color: var(--info); }
.warning-box {
  background: var(--warning-light);
  border: 1px solid var(--warning);
  border-radius: var(--radius-sm);
  padding: .85rem 1rem;
  margin: .75rem 0;
  font-size: .88rem;
}
.warning-box strong { color: var(--warning); }
.lesson-exercise { margin-top: 2rem; border-top: 2px solid var(--border); padding-top: 1.5rem; }
.lesson-exercise h3 { margin-bottom: 1rem; }
.exercise-question { margin-bottom: 1.25rem; }
.exercise-q { font-weight: 600; margin-bottom: .6rem; }
.exercise-options { display: flex; flex-direction: column; gap: .4rem; }
.exercise-option {
  padding: .55rem .9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  font-size: .9rem;
  transition: all var(--transition);
  text-align: left;
}
.exercise-option:hover { border-color: var(--accent-dark); background: var(--bg); }
.exercise-option.correct { border-color: var(--success); background: var(--success-light); color: var(--success); }
.exercise-option.incorrect { border-color: var(--danger); background: var(--danger-light); color: var(--danger); }
.exercise-option:disabled { cursor: default; opacity: .7; }
.exercise-feedback { font-size: .85rem; margin-top: .5rem; font-weight: 500; }
.exercise-feedback.correct { color: var(--success); }
.exercise-feedback.incorrect { color: var(--danger); }
.lesson-nav { display: flex; gap: 1rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.lesson-complete-btn { margin-top: 1.5rem; }

/* ===== QUIZ ===== */
.quiz-view { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; max-width: 640px; margin: 0 auto; }
.quiz-setup { width: 100%; }
.quiz-setup h2 { margin-bottom: .5rem; }
.quiz-setup p { color: var(--text-muted); margin-bottom: 1.5rem; }
.quiz-level-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.quiz-level-card {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.quiz-level-card:hover { border-color: var(--accent-dark); box-shadow: var(--shadow-md); }
.quiz-level-card.selected { border-color: var(--accent-dark); background: var(--accent); }
.qlc-level { font-size: 1.5rem; font-weight: 800; margin-bottom: .25rem; }
.qlc-desc { font-size: .78rem; color: var(--text-muted); }
.quiz-level-card.selected .qlc-desc { color: rgba(0,0,0,.6); }
.quiz-progress {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.quiz-progress-label { display: flex; justify-content: space-between; font-size: .82rem; color: var(--text-muted); }
.quiz-question-wrap { width: 100%; }
.quiz-question-card {
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  width: 100%;
}
.quiz-q-number { font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-bottom: .5rem; }
.quiz-q-type { font-size: .72rem; color: var(--text-light); margin-bottom: .75rem; }
.quiz-q-text { font-size: 1.2rem; font-weight: 700; margin-bottom: .25rem; }
.quiz-q-german { font-size: 1.5rem; font-weight: 800; color: var(--danger); margin: .75rem 0; }
.quiz-options { display: flex; flex-direction: column; gap: .6rem; }
.quiz-option {
  padding: .75rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  font-size: .95rem;
  transition: all var(--transition);
  text-align: left;
  font-weight: 500;
}
.quiz-option:hover { border-color: var(--accent-dark); background: var(--bg); }
.quiz-option.selected { border-color: var(--accent-dark); background: var(--bg); }
.quiz-option.correct { border-color: var(--success); background: var(--success-light); color: var(--success); }
.quiz-option.incorrect { border-color: var(--danger); background: var(--danger-light); color: var(--danger); }
.quiz-feedback { padding: .75rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-weight: 500; font-size: .9rem; }
.quiz-feedback.correct { background: var(--success-light); color: var(--success); }
.quiz-feedback.incorrect { background: var(--danger-light); color: var(--danger); }
.quiz-fill {
  width: 100%;
  padding: .65rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
  transition: border-color var(--transition);
}
.quiz-fill:focus { outline: none; border-color: var(--accent-dark); }
.quiz-fill.correct { border-color: var(--success); }
.quiz-fill.incorrect { border-color: var(--danger); }
.quiz-results { text-align: center; padding: 2rem; width: 100%; }
.quiz-score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--accent);
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}
.quiz-score-pct { font-size: 2rem; font-weight: 900; }
.quiz-score-label { font-size: .7rem; font-weight: 600; }
.quiz-wrong-list { text-align: left; margin-top: 1.5rem; }
.quiz-wrong-item {
  display: flex;
  gap: 1rem;
  padding: .65rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: .5rem;
  font-size: .88rem;
}
.wrong-german { font-weight: 700; color: var(--danger); min-width: 120px; }
.wrong-english { color: var(--text-muted); }

/* ===== PROGRESS ===== */
.progress-view { display: flex; flex-direction: column; gap: 1.5rem; }
.progress-hero {
  padding: 1.75rem;
  background: linear-gradient(135deg, #1A1A1A 0%, #333 100%);
  color: #fff;
  border-radius: var(--radius-lg);
}
.progress-hero h2 { color: #fff; margin-bottom: 1.5rem; }
.b1-progress-label { color: rgba(255,255,255,.7); font-size: .82rem; margin-bottom: .4rem; display: flex; justify-content: space-between; }
.b1-progress-bar { height: 14px; background: rgba(255,255,255,.2); border-radius: 7px; overflow: hidden; margin-bottom: 1.5rem; }
.b1-progress-fill { height: 100%; background: var(--accent); border-radius: 7px; transition: width .6s ease; }
.progress-milestones { display: flex; gap: 1rem; flex-wrap: wrap; }
.milestone { background: rgba(255,255,255,.1); border-radius: var(--radius-sm); padding: .5rem .85rem; font-size: .8rem; }
.milestone.done { background: var(--accent); color: #000; font-weight: 600; }
.vocab-breakdown { padding: 1.5rem; }
.vocab-breakdown h3 { margin-bottom: 1rem; }
.vocab-bars { display: flex; flex-direction: column; gap: .9rem; }
.vocab-bar-row { display: flex; align-items: center; gap 1rem; }
.vocab-bar-label { width: 80px; font-size: .82rem; color: var(--text-muted); font-weight: 500; }
.vocab-bar-wrap { flex: 1; height: 10px; background: var(--border); border-radius: 5px; overflow: hidden; }
.vocab-bar-fill { height: 100%; border-radius: 5px; }
.vocab-bar-count { width: 50px; text-align: right; font-size: .82rem; font-weight: 600; }
.categories-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; padding: 1.5rem; }
.cat-card { background: var(--bg); border-radius: var(--radius-sm); padding: 1rem; }
.cat-name { font-weight: 600; font-size: .88rem; margin-bottom: .4rem; }
.cat-bar-wrap { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin-bottom: .3rem; }
.cat-bar-fill { height: 100%; border-radius: 3px; background: var(--accent-dark); }
.cat-count { font-size: .75rem; color: var(--text-muted); }
.recent-quizzes { padding: 1.5rem; }
.recent-quizzes h3 { margin-bottom: 1rem; }
.quiz-history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
}
.quiz-history-item:last-child { border-bottom: none; }
.qhi-score { font-weight: 700; }
.qhi-score.high { color: var(--success); }
.qhi-score.mid { color: var(--warning); }
.qhi-score.low { color: var(--danger); }
.reset-btn { margin-top: .5rem; }

/* ===== Loading / Misc ===== */
.loading { text-align: center; padding: 3rem; color: var(--text-muted); }
.vocab-tag {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: .1rem .4rem;
  font-size: .82rem;
  font-family: monospace;
  font-weight: 600;
}
.der { color: #1565C0; }
.die { color: #C62828; }
.das { color: #2E7D32; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .dashboard-sections { grid-template-columns: 1fr; }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
  .lessons-layout { grid-template-columns: 1fr; }
  .lessons-sidebar { position: static; }
}
@media (max-width: 640px) {
  .header-inner { gap: .75rem; }
  .logo-text { display: none; }
  #main-nav { gap: 0; }
  .nav-link { padding: .4rem .55rem; font-size: .82rem; }
  .dashboard-hero { flex-direction: column; text-align: center; }
  .hero-visual { display: none; }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
  .rating-buttons { grid-template-columns: repeat(2, 1fr); }
  .quiz-level-cards { grid-template-columns: 1fr; }
  .session-results { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  #app { padding: 1rem .75rem; }
  .header-stats { display: none; }
}