/* ==========================================================================
   DEUTSCHMEISTER DESIGN SYSTEM
   Modern, Unified, Beautiful German Language Learning Architecture
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color Palette - Light Mode */
  --bg-primary: #F8F9FA;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-subtle: #F1F3F5;
  --bg-subtle-hover: #E9ECEF;
  --border-subtle: #E9ECEF;
  --border-default: #DEE2E6;
  --border-strong: #CED4DA;

  --text-primary: #1A1D20;
  --text-secondary: #495057;
  --text-muted: #868E96;
  --text-inverse: #FFFFFF;

  /* German Gender Colors */
  --color-der: #1E6091;
  --color-der-bg: #E8F1F8;
  --color-der-border: #B5D2EC;
  --color-die: #D90429;
  --color-die-bg: #FDE8EB;
  --color-die-border: #F7B5BE;
  --color-das: #2D6A4F;
  --color-das-bg: #E8F5EE;
  --color-das-border: #B7DFCA;

  /* Case Colors */
  --case-nom: #1B5E9C;
  --case-nom-bg: #E7F0F9;
  --case-akk: #0F7A6B;
  --case-akk-bg: #E6F5F3;
  --case-dat: #B37D00;
  --case-dat-bg: #FEF8E7;
  --case-gen: #6E3B96;
  --case-gen-bg: #F4EDF9;

  /* Leitner SRS Box Colors */
  --box-0: #ADB5BD;
  --box-1: #E03131;
  --box-2: #F76707;
  --box-3: #F59F00;
  --box-4: #2F9E44;
  --box-5: #0CA678;

  /* Brand Accents */
  --accent: #2B6CB0;
  --accent-light: #EBF8FF;
  --accent-dark: #1E4E8C;
  --accent-gradient: linear-gradient(135deg, #2B6CB0 0%, #3182CE 100%);
  --success: #2B8A3E;
  --success-bg: #EBFBEE;
  --error: #C92A2A;
  --error-bg: #FFF5F5;
  --warning: #E67700;
  --warning-bg: #FFF9DB;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, Cambria, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Monaco, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* Safe Area / Notch / Dynamic Island Insets */
  --preview-safe-top: 0px;
  --preview-safe-bottom: 0px;
  --safe-area-top: max(env(safe-area-inset-top, 0px), var(--preview-safe-top, 0px));
  --safe-area-bottom: max(env(safe-area-inset-bottom, 0px), var(--preview-safe-bottom, 0px));
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);

  /* Layout */
  --max-w: 1140px;
  --header-base-height: 64px;
  --header-height: calc(var(--header-base-height) + var(--safe-area-top));
}

:root.device-preview-frame,
body.device-preview-frame {
  --preview-safe-top: 47px;
  --preview-safe-bottom: 20px;
}

[data-theme="dark"] {
  --bg-primary: #121417;
  --bg-surface: #1A1D21;
  --bg-surface-elevated: #24282E;
  --bg-subtle: #24282E;
  --bg-subtle-hover: #2D323A;
  --border-subtle: #2A2F37;
  --border-default: #343A46;
  --border-strong: #495057;

  --text-primary: #F8F9FA;
  --text-secondary: #ADB5BD;
  --text-muted: #6C757D;
  --text-inverse: #121417;

  --color-der: #4DABF7;
  --color-der-bg: #182838;
  --color-der-border: #224263;
  --color-die: #FF6B6B;
  --color-die-bg: #38181E;
  --color-die-border: #63222B;
  --color-das: #51CF66;
  --color-das-bg: #183824;
  --color-das-border: #226337;

  --case-nom: #4DABF7;
  --case-nom-bg: #182838;
  --case-akk: #38D9A9;
  --case-akk-bg: #16362D;
  --case-dat: #FCC419;
  --case-dat-bg: #362E12;
  --case-gen: #CC5DE8;
  --case-gen-bg: #32163B;

  --accent: #339AF0;
  --accent-light: #182838;
  --accent-dark: #228BE6;
  --accent-gradient: linear-gradient(135deg, #1C7ED6 0%, #228BE6 100%);
  --success: #40C057;
  --success-bg: #162E1B;
  --error: #FA5252;
  --error-bg: #361719;
  --warning: #FD7E14;
  --warning-bg: #382414;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  transition: all 0.15s ease;
}

button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 249, 250, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding-top: var(--safe-area-top);
  height: var(--header-height);
  box-sizing: border-box;
  transition: background-color 0.2s, border-color 0.2s;
}

[data-theme="dark"] .app-header {
  background: rgba(18, 20, 23, 0.88);
}

.header-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-wrap {
  display: inline-flex;
  align-items: center;
  height: 36px;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1;
  flex-shrink: 0;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 20px;
  padding: 0 6px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1;
}

.brand-flag {
  display: inline-flex;
  flex-direction: column;
  width: 20px;
  height: 14px;
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
  flex-shrink: 0;
}
.brand-flag span:nth-child(1) { height: 33.3%; background: #000; }
.brand-flag span:nth-child(2) { height: 33.3%; background: #DD0000; }
.brand-flag span:nth-child(3) { height: 33.4%; background: #FFCE00; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 36px;
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  height: 36px;
  padding: 0 0.85rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  line-height: 1;
  color: var(--text-secondary);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.nav-link:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-counter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 20px;
  min-width: 22px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
  border-radius: 10px;
  background: var(--bg-subtle-hover);
  color: var(--text-muted);
}

.nav-counter.alert {
  background: var(--error);
  color: #fff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  height: 36px;
  flex-shrink: 0;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 36px;
  padding: 0 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.stat-chip b {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-weight: 700;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all 0.15s;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  font-size: 1rem;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* ==========================================================================
   Main App Container
   ========================================================================== */

.app-main {
  flex: 1;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

/* ==========================================================================
   Hero & Level KPI Cards / Compact Dashboard Header
   ========================================================================== */

/* Dashboard Compact Control Bar */
.dashboard-compact-bar {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1.25rem;
  margin-bottom: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
  box-shadow: var(--shadow-sm);
}

.compact-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.compact-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.compact-heading {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.compact-stat-chip {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--brand-accent);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.compact-progress-track {
  width: 120px;
  height: 6px;
  background: var(--bg-subtle);
  border-radius: 999px;
  overflow: hidden;
}

.compact-progress-fill {
  height: 100%;
  background: var(--brand-accent);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.compact-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.compact-continue-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 0.9rem;
  background: var(--brand-accent);
  color: #fff;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 600;
  transition: opacity 0.15s, transform 0.15s;
}

.compact-continue-btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.compact-continue-btn .btn-tag {
  font-size: 0.7rem;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.12rem 0.38rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Dashboard Filter Toolbar */
.dashboard-filter-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.15rem;
}

.chip-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  opacity: 0.85;
  margin-left: 0.25rem;
}

.compact-search-wrap {
  position: relative;
  min-width: 220px;
}

.compact-search-input {
  width: 100%;
  padding: 0.42rem 1.8rem 0.42rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.85rem;
  transition: border-color 0.15s;
}

.compact-search-input:focus {
  outline: none;
  border-color: var(--brand-accent);
}

.compact-search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0;
}

.hero-section {
  margin-bottom: 2rem;
}

.hero-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
}

.hero-banner::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  height: 100%;
  background: radial-gradient(circle at top right, rgba(43, 108, 176, 0.08), transparent 70%);
  pointer-events: none;
}

.hero-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero-title-area h1 {
  font-size: 1.95rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 60ch;
}

/* Continue Practice Callout */
.continue-card {
  display: inline-flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.9rem 1.4rem;
  background: var(--accent-gradient);
  color: var(--text-inverse);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 14px rgba(43, 108, 176, 0.3);
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.continue-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(43, 108, 176, 0.4);
}

.continue-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.continue-tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.9;
  font-weight: 700;
}

.continue-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.continue-icon {
  font-size: 1.4rem;
}

/* CEFR Level Summary Cards */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.level-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s, border-color 0.15s;
  cursor: pointer;
  position: relative;
}

.level-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
}

.level-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.level-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.level-badge {
  font-weight: 800;
  font-size: 0.85rem;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
}

.level-badge.a1 { background: #E7F5FF; color: #1971C2; }
.level-badge.a2 { background: #E6FCF5; color: #0CA678; }
.level-badge.b1 { background: #FFF4E6; color: #F76707; }

.level-pct {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.level-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

/* SRS 6-Stage Leitner Bar */
.srs-bar {
  display: flex;
  height: 8px;
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: var(--bg-subtle);
  margin-top: 0.4rem;
}

.srs-segment {
  height: 100%;
  transition: width 0.3s ease;
}

.srs-segment.b0 { background: var(--box-0); opacity: 0.4; }
.srs-segment.b1 { background: var(--box-1); }
.srs-segment.b2 { background: var(--box-2); }
.srs-segment.b3 { background: var(--box-3); }
.srs-segment.b4 { background: var(--box-4); }
.srs-segment.b5 { background: var(--box-5); }

/* Mistakes Banner */
.mistakes-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--error-bg);
  border: 1px solid var(--color-die-border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  color: var(--error);
  animation: fadeIn 0.2s ease-out;
}

.mistakes-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mistakes-info svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.mistakes-text h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.mistakes-text p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.btn-mistakes {
  background: var(--error);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.85rem;
  white-space: nowrap;
}

.btn-mistakes:hover {
  filter: brightness(1.1);
}

/* ==========================================================================
   Section Controls & Filter Tabs
   ========================================================================== */

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 2.25rem 0 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.section-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.filter-chips {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 4px;
  border-radius: var(--radius-lg);
}

.chip-btn {
  padding: 5px 12px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.chip-btn:hover {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.chip-btn.active {
  background: var(--text-primary);
  color: var(--bg-surface);
}

/* ==========================================================================
   Topic Cards Grid (17 Grammar Modules)
   ========================================================================== */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.topic-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  position: relative;
}

.topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
}

.topic-card-top {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
}

.topic-num {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

.topic-info {
  flex: 1;
  min-width: 0;
}

.topic-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.topic-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.topic-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  line-height: 1.4;
}

.topic-card-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0;
  margin: 0.6rem 0 0.75rem;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.topic-card-stats b {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

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

.btn-primary {
  flex: 1;
  background: var(--text-primary);
  color: var(--bg-surface);
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  text-align: center;
  transition: all 0.15s;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-secondary {
  padding: 0.55rem 0.85rem;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  text-align: center;
  transition: all 0.15s;
}

.btn-secondary:hover {
  background: var(--bg-subtle-hover);
  color: var(--text-primary);
}

/* ==========================================================================
   Exercise Drilling UI (Grammar & Deutschtrainer)
   ========================================================================== */

.drill-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 1rem 0;
}

.drill-nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--text-primary);
}

.drill-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
}

.drill-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.drill-prompt {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  line-height: 1.45;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.drill-gloss {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.drill-slot {
  display: inline-block;
  min-width: 60px;
  text-align: center;
  border-bottom: 3px solid var(--text-primary);
  padding: 0 4px;
  font-weight: 600;
  transition: border-color 0.2s, color 0.2s;
}

.drill-slot[data-filled="1"] {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* Choices Grid */
.choices-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.choice-chip {
  padding: 0.75rem 1.25rem;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all 0.12s ease;
}

.choice-chip:hover:not(:disabled) {
  background: var(--bg-subtle-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.choice-chip.correct {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.choice-chip.incorrect {
  background: var(--error);
  border-color: var(--error);
  color: #fff;
}

.choice-chip.dimmed {
  opacity: 0.4;
}

/* Input typing field */
.drill-input {
  width: 100%;
  padding: 0.85rem 1.1rem;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  background: var(--bg-subtle);
  border: 2px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color 0.15s, background-color 0.15s;
}

.drill-input:focus {
  border-color: var(--accent);
  background: var(--bg-surface);
  outline: none;
}

.drill-input.correct {
  border-color: var(--success);
  background: var(--success-bg);
}

.drill-input.incorrect {
  border-color: var(--error);
  background: var(--error-bg);
}

/* Token Word Ordering */
.token-line {
  min-height: 56px;
  border-bottom: 2.5px solid var(--text-primary);
  padding: 6px 2px 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 1.25rem;
}

.token-line:empty::after {
  content: "Click the words below in the correct order";
  font-size: 0.9rem;
  color: var(--text-muted);
}

.token-chip {
  padding: 0.5rem 0.9rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  box-shadow: var(--shadow-sm);
}

.token-chip[data-used="1"] {
  opacity: 0.25;
  pointer-events: none;
}

.token-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Feedback Box */
.feedback-box {
  margin-top: 1.75rem;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--bg-subtle);
  border-left: 4px solid var(--border-strong);
  animation: fadeIn 0.2s ease-out;
}

.feedback-box.correct {
  background: var(--success-bg);
  border-left-color: var(--success);
}

.feedback-box.incorrect {
  background: var(--error-bg);
  border-left-color: var(--error);
}

.verdict-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.feedback-box.correct .verdict-tag { background: var(--success); color: #fff; }
.feedback-box.incorrect .verdict-tag { background: var(--error); color: #fff; }

.feedback-note {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-primary);
}

.feedback-note code {
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.06);
  padding: 2px 5px;
  border-radius: 4px;
}

.btn-next-question {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.85rem;
  margin-top: 1.25rem;
  background: var(--text-primary);
  color: var(--bg-surface);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1rem;
}

.btn-next-question:hover {
  filter: brightness(1.1);
}

/* Drill Completion Screen */
.drill-complete-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2.75rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  max-width: 620px;
  margin: 1.5rem auto 0;
  animation: fadeIn 0.25s ease-out;
}

.complete-icon {
  font-size: 3.5rem;
  line-height: 1;
  margin-bottom: 0.75rem;
  animation: completeBounce 0.6s ease;
}

@keyframes completeBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.complete-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 0 0 0.4rem;
  color: var(--text-primary);
}

.complete-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  line-height: 1.5;
}

.complete-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.complete-stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
}

.complete-stat .stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.complete-stat .stat-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
}

.complete-mistakes-alert {
  background: var(--error-bg);
  border: 1px solid var(--color-die-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  color: var(--error);
  margin-bottom: 1.75rem;
  text-align: left;
}

.complete-success-alert {
  background: var(--color-das-bg);
  border: 1px solid var(--color-das-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  color: var(--color-das);
  margin-bottom: 1.75rem;
  text-align: left;
}

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

/* Paradigm Table Preview */
.paradigm-table-wrap {
  margin-top: 1.25rem;
  overflow-x: auto;
}

.paradigm-table {
  border-collapse: collapse;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}

.paradigm-table th, .paradigm-table td {
  padding: 6px 8px;
  text-align: center;
  border: 1px solid var(--border-default);
}

.paradigm-table th {
  background: var(--bg-subtle);
  font-weight: 600;
  color: var(--text-secondary);
}

.paradigm-table td.highlight {
  background: var(--text-primary);
  color: var(--bg-surface);
  font-weight: 700;
}

/* ==========================================================================
   Wortschatz Flashcards UI
   ========================================================================== */

.flashcard-wrap {
  max-width: 600px;
  margin: 0 auto;
  perspective: 1000px;
}

.flashcard {
  min-height: 320px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s;
  position: relative;
}

.flashcard:hover {
  box-shadow: var(--shadow-card-hover);
}

.card-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-center {
  padding: 2rem 0;
}

.card-word {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.card-forms {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.card-back {
  border-top: 1px dashed var(--border-default);
  padding-top: 1.5rem;
  margin-top: 1rem;
  animation: fadeIn 0.2s ease-out;
}

.card-translation {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.card-example-de {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.card-example-en {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn-card-learn {
  background: var(--error-bg);
  color: var(--error);
  border: 1.5px solid var(--color-die-border);
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
}

.btn-card-master {
  background: var(--success);
  color: #fff;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
}

/* ==========================================================================
   Traceability Hub & Mistakes Review UI
   ========================================================================== */

.traceability-hub {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeline-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s;
}

.timeline-item.right {
  border-left: 4px solid var(--success);
}

.timeline-item.wrong {
  border-left: 4px solid var(--error);
}

.timeline-main {
  flex: 1;
}

.timeline-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.timeline-prompt {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-answer-compare {
  font-size: 0.88rem;
  margin-top: 0.25rem;
}

.timeline-given {
  color: var(--error);
  text-decoration: line-through;
  margin-right: 0.5rem;
}

.timeline-expected {
  color: var(--success);
  font-weight: 700;
}

/* ==========================================================================
   Animations & Responsive Breakpoints
   ========================================================================== */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .hero-banner { padding: 1.25rem; }
  .drill-card { padding: 1.5rem 1.25rem; }
  .drill-prompt { font-size: 1.35rem; }
  .topic-grid { grid-template-columns: 1fr; }
  .level-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Line A2 → B1 & Mission B1 Journey UI (Metro Route & Station Companion)
   ========================================================================== */

.journey-linewrap {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1rem 0.5rem 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.journey-line {
  display: flex;
  padding: 10px 14px 4px;
  width: max-content;
  min-width: 100%;
}

.journey-stop {
  position: relative;
  width: 42px;
  flex: 0 0 42px;
  height: 48px;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.journey-stop::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 14px;
  height: 5px;
  background: var(--wk, var(--accent));
  z-index: 1;
}

.journey-stop:first-child::before {
  left: 50%;
  border-radius: 3px 0 0 3px;
}

.journey-stop:last-child::before {
  right: 50%;
  border-radius: 0 3px 3px 0;
}

.journey-dot {
  position: absolute;
  left: 50%;
  top: 16.5px;
  transform: translate(-50%, -50%);
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 3px solid var(--wk, var(--accent));
  transition: all 0.2s ease;
  z-index: 2;
}

.journey-stop:hover .journey-dot {
  transform: translate(-50%, -50%) scale(1.25);
}

.journey-stop.done .journey-dot {
  background: var(--success);
  border-color: var(--success);
}

.journey-stop.now .journey-dot {
  background: #f59e0b;
  border-color: #f59e0b;
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.35);
  width: 19px;
  height: 19px;
}

.journey-stopnum {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
}

.journey-stop.now .journey-stopnum {
  color: #f59e0b;
}

.journey-stop.done .journey-stopnum {
  color: var(--success);
}

/* Station Card */
.station-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
}

.station-subnav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-default);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
  overflow-x: auto;
}

.station-subnav-btn {
  appearance: none;
  background: none;
  border: 0;
  padding: 0.5rem 0.95rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.station-subnav-btn:hover {
  background: var(--bg-subtle-hover);
  color: var(--text-primary);
}

.station-subnav-btn.active {
  background: var(--accent-subtle);
  color: var(--accent);
  font-weight: 700;
}

/* Flashcard Component */
.flashcard-wrap {
  perspective: 1000px;
  max-width: 480px;
  margin: 1rem auto;
}

.flashcard-box {
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 2.25rem 1.75rem;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.flashcard-box:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.flashcard-front-word {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.flashcard-category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.flashcard-back {
  border-top: 1px dashed var(--border-default);
  margin-top: 1rem;
  padding-top: 1rem;
  width: 100%;
}

.flashcard-en {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.flashcard-ex {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-secondary);
}

/* Sentence Builder Chips */
.sentence-slot {
  min-height: 56px;
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-lg);
  padding: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-content: flex-start;
  background: var(--bg-surface);
  margin: 1rem 0;
  transition: all 0.2s ease;
}

.sentence-slot.right {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.08);
  border-style: solid;
}

.sentence-slot.wrong {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.08);
  border-style: solid;
}

.word-chip {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 0.45rem 0.85rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
}

.word-chip:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.chips-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.85rem 0;
}

/* Leitner 5-Box Distribution Bar (Tactile Deutschtrainer) */
.leitner-bar-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-top: 1.5rem;
}

.leitner-boxes-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.leitner-box-item {
  text-align: center;
  padding: 0.5rem 0.25rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
}

.leitner-box-count {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.leitner-box-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.leitner-segmented-meter {
  display: flex;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--border-default);
  gap: 2px;
}

.leitner-segment {
  height: 100%;
  transition: width 0.3s ease;
}



/* ==========================================================================
   MOBILE & TABLET RESPONSIVE SYSTEM (Ergonomic Smartphone Experience)
   ========================================================================== */

/* Touch Ergonomics & Form Optimization */
*, *::before, *::after {
  -webkit-tap-highlight-color: transparent;
}

button, a, input, select, textarea {
  touch-action: manipulation;
}

/* Ensure mobile bottom nav is hidden on desktop by default */
.mobile-bottom-nav {
  display: none;
}

@media (max-width: 768px) {
  /* Prevent iOS Safari auto-zoom on form inputs */
  input[type="text"],
  input[type="search"],
  input[type="email"],
  select,
  textarea {
    font-size: 16px !important;
  }

  /* Body & App Main Spacing for Mobile Bottom Nav */
  body {
    overflow-x: hidden;
  }

  :root {
    --header-base-height: 52px;
  }

  .app-main {
    padding: 0.75rem 0.75rem calc(72px + var(--safe-area-bottom));
    max-width: 100%;
  }

  /* Header Optimization */
  .app-header {
    height: var(--header-height);
    padding-top: var(--safe-area-top);
  }

  .header-container {
    padding: 0 0.85rem;
    gap: 0.5rem;
  }

  .brand-wrap {
    font-size: 1.05rem;
    gap: 0.45rem;
  }

  .brand-flag {
    width: 17px;
    height: 12px;
  }

  .brand-badge {
    height: 18px;
    font-size: 0.65rem;
    padding: 0 4px;
  }

  /* Hide Desktop Nav in Header */
  .nav-links {
    display: none !important;
  }

  /* Hide Desktop Segmented Sub-Bar & Desktop Metro Line on Mobile */
  .dt-app-bar {
    display: none !important;
  }

  .desktop-metro-line {
    display: none !important;
  }

  /* Compact Header Actions (Hide verbose stat text, keep theme toggle) */
  .header-actions .stat-chip {
    display: none !important;
  }

  .icon-btn {
    width: 34px;
    height: 34px;
    font-size: 0.95rem;
  }

  /* Mobile Bottom Navigation Bar (Authentic Native App Tab Bar) */
  .mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(56px + var(--safe-area-bottom));
    padding-bottom: var(--safe-area-bottom);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-top: 1px solid var(--border-default);
    display: flex !important;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
  }

  [data-theme="dark"] .mobile-bottom-nav {
    background: rgba(18, 20, 23, 0.94);
    border-top-color: var(--border-subtle);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.45);
  }

  .mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-width: 0;
    height: 100%;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 3px 0 2px;
    user-select: none;
    -webkit-user-select: none;
  }

  .mobile-nav-icon {
    font-size: 1.2rem;
    line-height: 1.15;
    margin-bottom: 2px;
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .mobile-nav-label {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    padding: 0 2px;
  }

  .mobile-nav-item:active .mobile-nav-icon {
    transform: scale(0.88);
  }

  .mobile-nav-item.active {
    color: var(--accent);
    font-weight: 800;
  }

  .mobile-nav-item.active .mobile-nav-icon {
    transform: scale(1.15);
  }

  .mobile-nav-badge {
    position: absolute;
    top: 4px;
    right: calc(50% - 18px);
    background: var(--accent);
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-weight: 800;
    border-radius: 999px;
    padding: 1px 4.5px;
    line-height: 1.2;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  }

  /* DeutschTrainer Mode Selector Tabs (Horizontal Touch Strip) */
  .dt-mode-tabs {
    display: flex !important;
    gap: 0.4rem !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    flex-wrap: nowrap !important;
    margin: 0 -0.85rem !important;
    padding: 4px 0.85rem 6px !important;
  }

  .dt-mode-tabs::-webkit-scrollbar {
    display: none !important;
  }

  .dt-mode-tabs .chip-btn {
    flex-shrink: 0 !important;
    white-space: nowrap !important;
    font-size: 0.82rem !important;
    padding: 0.45rem 0.85rem !important;
    min-height: 40px !important;
    display: inline-flex !important;
    align-items: center !important;
  }

  /* Guided Journey Header Bar */
  .journey-header-bar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
  }

  .journey-header-right {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-subtle);
  }

  .journey-title {
    font-size: 1.3rem !important;
    flex-wrap: wrap !important;
    gap: 0.4rem !important;
  }

  /* Metro Line Touch Scroll */
  .journey-linewrap {
    padding: 0.75rem 0.25rem 0.5rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .journey-linewrap::-webkit-scrollbar {
    display: none;
  }

  .journey-stop {
    width: 44px;
    flex: 0 0 44px;
    height: 52px;
  }

  .journey-stopnum {
    top: 32px;
    font-size: 0.75rem;
  }

  /* Station Card Mobile Layout */
  .station-card {
    padding: 1.15rem 1rem !important;
    border-radius: var(--radius-lg) !important;
  }

  .station-nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
  }

  .station-badges-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
  }

  .station-quick-nav {
    display: flex;
    gap: 0.35rem;
  }

  .station-quick-nav button {
    min-height: 40px;
    min-width: 44px;
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 700;
  }

  .station-focus-title {
    font-size: 1.25rem !important;
    margin-bottom: 0.85rem !important;
  }

  /* Station Subnav Strip (Horizontal Scroll) */
  .station-subnav {
    display: flex !important;
    gap: 0.35rem !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    flex-wrap: nowrap !important;
    margin: 0 -1rem 1rem !important;
    padding: 0 1rem 0.5rem !important;
  }

  .station-subnav::-webkit-scrollbar {
    display: none !important;
  }

  .station-subnav-btn {
    flex-shrink: 0 !important;
    white-space: nowrap !important;
    font-size: 0.82rem !important;
    padding: 0.45rem 0.75rem !important;
    min-height: 40px !important;
  }

  /* Station Footer Actions */
  .station-footer-actions {
    display: flex;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.75rem !important;
    margin-top: 1.5rem !important;
    padding-top: 1rem !important;
  }

  .station-footer-btns {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
  }

  .station-footer-btns button {
    width: 100% !important;
    min-height: 48px !important;
    font-size: 0.95rem !important;
    justify-content: center !important;
  }

  /* Drills & Sentence Builder on Mobile */
  .choices-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 0.6rem !important;
    width: 100% !important;
    margin-top: 1rem !important;
  }

  .choice-chip {
    width: 100% !important;
    min-height: 50px !important;
    text-align: left !important;
    padding: 0.85rem 1rem !important;
    font-size: 1rem !important;
    border-radius: var(--radius-md) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: flex-start !important;
  }

  .sentence-slot {
    min-height: 60px !important;
    padding: 0.65rem !important;
    gap: 0.4rem !important;
  }

  .word-chip {
    min-height: 44px !important;
    padding: 0.5rem 0.85rem !important;
    font-size: 1rem !important;
    display: inline-flex !important;
    align-items: center !important;
  }

  .chips-bank {
    gap: 0.4rem !important;
  }

  /* Flashcards on Mobile */
  .flashcard-wrap {
    max-width: 100% !important;
    margin: 0.75rem 0 !important;
  }

  .flashcard-box {
    min-height: 190px !important;
    padding: 1.5rem 1rem !important;
  }

  .flashcard-front-word {
    font-size: 1.6rem !important;
  }

  .flashcard-en {
    font-size: 1.15rem !important;
  }

  /* Free Practice Filters */
  .dt-filters-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.65rem !important;
  }

  .dt-filter-strip {
    display: flex !important;
    gap: 0.35rem !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    flex-wrap: nowrap !important;
  }

  .dt-filter-strip::-webkit-scrollbar {
    display: none !important;
  }

  .dt-filter-strip .chip-btn {
    flex-shrink: 0 !important;
    min-height: 38px !important;
  }

  /* Leitner 5-Box Distribution Bar on Mobile */
  .leitner-bar-container {
    padding: 0.85rem 0.75rem !important;
  }

  .leitner-boxes-row {
    gap: 0.25rem !important;
  }

  .leitner-box-item {
    padding: 0.35rem 0.15rem !important;
  }

  .leitner-box-count {
    font-size: 1rem !important;
  }

  .leitner-box-label {
    font-size: 0.62rem !important;
    letter-spacing: 0 !important;
  }

  /* Responsive Tables */
  .table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
    margin: 0.75rem 0;
  }

  /* Compact Dashboard Mobile Optimization */
  .dashboard-compact-bar {
    padding: 0.75rem !important;
  }

  .compact-left {
    gap: 0.5rem !important;
  }

  .compact-heading {
    font-size: 1.05rem !important;
  }
}

/* Extra Small Phones (<= 400px width) */
@media (max-width: 400px) {
  .app-main {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }

  .station-card {
    padding: 0.85rem 0.75rem !important;
  }

  .flashcard-front-word {
    font-size: 1.4rem !important;
  }

  .leitner-box-label {
    font-size: 0.58rem !important;
  }
}

/* ==========================================================================
   NATIVE MOBILE APP COMPONENTS (Segmented Track, Stepper, Tactile Cards)
   ========================================================================== */

/* Native App Segmented Bar */
.dt-app-bar {
  margin-bottom: 1.25rem;
}

.dt-segmented-track {
  display: flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  padding: 4px;
  gap: 4px;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.dt-seg-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.65rem;
  border-radius: var(--radius-pill);
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.dt-seg-btn:hover {
  color: var(--text-primary);
  background: var(--bg-subtle-hover);
}

.dt-seg-btn.active {
  background: var(--bg-surface);
  color: var(--accent);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.seg-badge {
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  font-weight: 700;
  border-radius: 999px;
  padding: 1px 6px;
  line-height: 1.2;
}

/* Unified Native App Station Hero */
.m-station-hero {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 1rem 1.15rem;
  margin-bottom: 0.85rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.m-hero-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.m-station-meta-pills {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.m-station-num-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
  color: var(--text-primary);
}

.m-phase-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
}

.m-done-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--success);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid var(--success);
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-pill);
}

.m-hero-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.m-stepper-btn {
  appearance: none;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.m-stepper-btn:active:not(:disabled) {
  transform: scale(0.92);
  background: var(--bg-subtle-hover);
}

.m-stepper-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.m-path-btn {
  appearance: none;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.m-path-btn:active {
  transform: scale(0.95);
}

.m-hero-content {
  margin-bottom: 0.65rem;
}

.m-theme-subtitle {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}

.m-focus-heading {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin: 0;
  color: var(--text-primary);
}

.m-hero-progress-group {
  margin-top: 0.5rem;
}

.m-progress-caption {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Native iOS-Style Segmented Navigation Tabs */
.m-subnav-segmented {
  display: flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  padding: 4px;
  gap: 3px;
  margin-bottom: 1.25rem;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
  width: 100%;
}

.m-seg-tab {
  flex: 1;
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  padding: 0.55rem 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.m-seg-tab.active {
  background: var(--bg-surface);
  color: var(--accent);
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.m-seg-tab:active {
  transform: scale(0.96);
}

.seg-tab-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 800;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 1px 5px;
  line-height: 1.2;
}

/* Duolingo / Babbel Style Native Roadmap */
.m-roadmap-container {
  padding-bottom: 3.5rem;
}

.m-roadmap-header {
  position: sticky;
  top: var(--header-height);
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.75rem 0;
  margin: -0.5rem 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-default);
}

[data-theme="dark"] .m-roadmap-header {
  background: rgba(18, 20, 23, 0.95);
}

.m-roadmap-back-btn {
  appearance: none;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
}

.m-roadmap-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.m-roadmap-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
}

.m-roadmap-progress-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-pill);
}

.m-week-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 1rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.m-week-header-bar {
  border-left: 4px solid var(--accent);
  padding-left: 0.75rem;
  margin-bottom: 0.85rem;
}

.m-week-meta {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.2rem;
}

.m-week-chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.m-week-phase-name {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.m-week-heading {
  font-size: 1.05rem;
  font-weight: 800;
  margin: 0.2rem 0;
  color: var(--text-primary);
}

.m-week-stat {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.m-week-all-done {
  color: var(--success);
  font-weight: 700;
}

.m-station-node-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.m-station-node {
  appearance: none;
  border: 1px solid var(--border-default);
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  padding: 0.75rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  min-height: 54px;
  width: 100%;
}

.m-station-node:active {
  transform: scale(0.98);
  background: var(--bg-subtle-hover);
}

.m-station-node.current {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.m-node-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
}

.m-node-circle {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 2px solid var(--wk, var(--accent));
  flex-shrink: 0;
}

.m-station-node.completed .m-node-circle {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.m-station-node.current .m-node-circle {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25);
}

.m-node-text {
  flex: 1;
}

.m-node-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.m-node-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.m-node-status {
  flex-shrink: 0;
}

.m-pill-current {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent);
  background: var(--bg-surface);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
}

.m-pill-done {
  color: var(--success);
  font-size: 1.1rem;
  font-weight: 800;
}

.m-pill-start {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.m-floating-return-btn {
  position: fixed;
  bottom: calc(68px + var(--safe-area-bottom));
  right: 1rem;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius-pill);
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 800;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  z-index: 950;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.m-floating-return-btn:active {
  transform: scale(0.95);
}

.m-progress-track {
  width: 100%;
  height: 6px;
  background: var(--border-subtle);
  border-radius: 999px;
  overflow: hidden;
}

.m-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* Audio Pronunciation Chip */
.m-audio-chip {
  appearance: none;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  color: var(--text-primary);
}

.m-audio-chip:hover {
  background: var(--bg-subtle-hover);
  border-color: var(--accent);
}

.m-audio-chip:active {
  transform: scale(0.9);
  background: var(--accent-light);
  border-color: var(--accent);
}

/* Linear Drill Stepper */
.m-drill-stepper {
  margin-bottom: 1.25rem;
}

.m-stepper-track {
  width: 100%;
  height: 6px;
  background: var(--border-default);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.45rem;
}

.m-stepper-fill {
  height: 100%;
  background: var(--success);
  border-radius: 999px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.m-stepper-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.m-step-badge {
  background: var(--bg-subtle);
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-sm);
}

.m-drill-prompt-card {
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.m-drill-prompt-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.45;
  color: var(--text-primary);
  flex: 1;
}

.choice-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-right: 0.65rem;
  flex-shrink: 0;
}

/* 3D Tactile Choice Chips */
.choice-chip {
  border-bottom: 3px solid var(--border-strong) !important;
}

.choice-chip:active:not(:disabled) {
  transform: translateY(2px) !important;
  border-bottom-width: 1px !important;
}

.choice-chip.correct {
  background: var(--success) !important;
  border-color: #237834 !important;
  color: #fff !important;
}

.choice-chip.incorrect {
  background: var(--error) !important;
  border-color: #a82323 !important;
  color: #fff !important;
}

/* Feedback Drawer */
.m-feedback-sheet {
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  margin-top: 1.25rem;
  animation: fadeIn 0.2s ease;
}

.m-feedback-sheet.success {
  background: var(--success-bg);
  border: 1.5px solid var(--success);
}

.m-feedback-sheet.error {
  background: var(--error-bg);
  border: 1.5px solid var(--error);
}

.m-next-btn {
  width: 100%;
  min-height: 48px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  justify-content: center;
  display: inline-flex;
  align-items: center;
}

.m-start-drill-btn {
  width: 100%;
  min-height: 48px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-lg);
  justify-content: center;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Flashcard Dots */
.m-card-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 0.85rem;
}

.m-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-default);
  transition: all 0.2s ease;
}

.m-dot.active {
  width: 22px;
  border-radius: 4px;
  background: var(--accent);
}

/* Workshop Writing & Speaking Responsive Layout */
.workshop-writing-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.workshop-task-list {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 650px;
  overflow-y: auto;
}

.workshop-task-btn {
  appearance: none;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.15s ease;
  width: 100%;
}

.workshop-task-btn:hover {
  background: var(--bg-subtle-hover);
  border-color: var(--accent);
}

.workshop-task-btn.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 700;
}

.workshop-task-btn .task-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  opacity: 0.75;
}

@media (max-width: 768px) {
  .workshop-writing-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 1rem !important;
  }

  .workshop-task-list {
    display: flex !important;
    flex-direction: row !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    max-height: none !important;
    padding: 0.4rem !important;
    gap: 0.4rem !important;
    border-radius: var(--radius-lg) !important;
    margin: 0 -0.25rem 0.5rem !important;
  }

  .workshop-task-list::-webkit-scrollbar {
    display: none !important;
  }

  .workshop-task-btn {
    flex-shrink: 0 !important;
    width: auto !important;
    white-space: nowrap !important;
    min-height: 42px !important;
    padding: 0.4rem 0.85rem !important;
    font-size: 0.82rem !important;
  }

  .workshop-detail-card {
    padding: 1rem !important;
    box-sizing: border-box !important;
    width: 100% !important;
  }
}