/* ============================================================================
   POLSKI OD A DO Z (v4.0 MODERN DESIGN SYSTEM)
   Linear / Raycast / Duolingo-Max Inspired Dark-First UI
   Zero-Overlap Flex/Grid Architecture, Crisp Typography & Subtle Glassmorphism
   ============================================================================ */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Light Theme Tokens */
  --bg-primary: #F8FAFC;
  --bg-secondary: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-elevated: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.86);

  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;

  --border-color: rgba(15, 23, 42, 0.09);
  --border-strong: rgba(15, 23, 42, 0.16);
  --border-highlight: rgba(37, 99, 235, 0.35);

  --brand-crimson: #E11D48;
  --brand-crimson-soft: rgba(225, 29, 72, 0.10);
  --brand-indigo: #2563EB;
  --brand-indigo-soft: rgba(37, 99, 235, 0.10);

  --masc-bg: rgba(37, 99, 235, 0.06);
  --masc-border: rgba(37, 99, 235, 0.24);
  --masc-text: #1D4ED8;

  --fem-bg: rgba(225, 29, 72, 0.06);
  --fem-border: rgba(225, 29, 72, 0.24);
  --fem-text: #BE123C;

  --neut-bg: rgba(217, 119, 6, 0.07);
  --neut-border: rgba(217, 119, 6, 0.26);
  --neut-text: #B45309;

  --plur-bg: rgba(124, 58, 237, 0.06);
  --plur-border: rgba(124, 58, 237, 0.24);
  --plur-text: #6D28D9;

  --verb-bg: rgba(5, 150, 105, 0.06);
  --verb-border: rgba(5, 150, 105, 0.24);
  --verb-text: #047857;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 10px 28px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 44px rgba(15, 23, 42, 0.12);

  --radius-xs: 8px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
}

[data-theme="dark"] {
  --bg-primary: #090B10;
  --bg-secondary: #11151F;
  --bg-subtle: #171C29;
  --bg-elevated: #151A26;
  --bg-glass: rgba(13, 17, 26, 0.84);

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.15);
  --border-highlight: rgba(56, 189, 248, 0.42);

  --brand-crimson: #FB7185;
  --brand-crimson-soft: rgba(251, 113, 133, 0.14);
  --brand-indigo: #38BDF8;
  --brand-indigo-soft: rgba(56, 189, 248, 0.14);

  --masc-bg: rgba(56, 189, 248, 0.08);
  --masc-border: rgba(56, 189, 248, 0.28);
  --masc-text: #7DD3FC;

  --fem-bg: rgba(251, 113, 133, 0.08);
  --fem-border: rgba(251, 113, 133, 0.28);
  --fem-text: #FDA4AF;

  --neut-bg: rgba(251, 191, 36, 0.08);
  --neut-border: rgba(251, 191, 36, 0.28);
  --neut-text: #FDE68A;

  --plur-bg: rgba(167, 139, 250, 0.09);
  --plur-border: rgba(167, 139, 250, 0.28);
  --plur-text: #DDD6FE;

  --verb-bg: rgba(52, 211, 153, 0.08);
  --verb-border: rgba(52, 211, 153, 0.28);
  --verb-text: #6EE7B7;

  --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.48);
  --shadow-lg: 0 24px 56px rgba(0, 0, 0, 0.65);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56, 189, 248, 0.10), transparent),
    radial-gradient(ellipse 60% 40% at 85% 0%, rgba(251, 113, 133, 0.08), transparent);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.28;
  color: var(--text-primary);
}

/* ============================================================================
   SINGLE-ROW MODERN STICKY TOP HEADER
   ============================================================================ */
.top-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  max-width: 1560px;
  margin: 0 auto;
  height: 64px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-strong);
  background: var(--bg-subtle);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.flag-badge {
  width: 32px;
  height: 22px;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.flag-white { height: 50%; background: #FFFFFF; }
.flag-red { height: 50%; background: #E11D48; }

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
  line-height: 1.2;
}

/* Global Search Bar Trigger in Header */
.header-search-wrap {
  flex: 1;
  max-width: 480px;
  min-width: 180px;
}

.global-search-trigger {
  width: 100%;
  height: 38px;
  padding: 0 0.85rem;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.83rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  cursor: pointer;
  transition: all 0.16s ease;
}

.global-search-trigger:hover {
  border-color: var(--brand-indigo);
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.search-trigger-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.search-kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 5px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Header Right Controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.control-group {
  display: inline-flex;
  align-items: center;
  background: var(--bg-subtle);
  padding: 3px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  gap: 2px;
}

.control-group .control-pill {
  border: none;
  background: transparent;
  padding: 0.32rem 0.7rem;
}

.control-group .control-pill:hover {
  background: var(--bg-elevated);
  transform: none;
}

.control-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.38rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.79rem;
  font-weight: 600;
  background: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.control-pill:hover {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}

.control-pill.active-turtle {
  background: var(--neut-bg);
  color: var(--neut-text);
}

.xp-pill {
  background: var(--verb-bg);
  border-color: var(--verb-border);
  color: var(--verb-text);
  font-weight: 700;
  cursor: default;
}

.icon-pill {
  width: 36px;
  height: 36px;
  padding: 0;
}

.progress-bar-track {
  height: 2px;
  background: transparent;
  width: 100%;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #38BDF8, #FB7185, #34D399);
  width: 0%;
  transition: width 0.15s ease;
}

@media (max-width: 900px) {
  .mobile-menu-btn { display: inline-flex; }
  .brand-sub, .search-kbd, .hide-sm { display: none; }
  .header-inner { padding: 0 0.85rem; gap: 0.5rem; }
  .header-search-wrap { max-width: 220px; min-width: 110px; }
}

/* ============================================================================
   GLOBAL INSTANT SEARCH MODAL
   ============================================================================ */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 950;
  background: rgba(5, 8, 15, 0.78);
  backdrop-filter: blur(8px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 8vh 1rem 2rem;
}

.search-modal-backdrop.open {
  display: flex;
}

.search-modal-dialog {
  width: 100%;
  max-width: 680px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 80vh;
}

.search-modal-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.search-modal-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.search-modal-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
}

.search-modal-close {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: pointer;
}

.search-modal-results {
  padding: 0.85rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.14s ease;
}

.search-result-item:hover {
  border-color: var(--brand-indigo);
  background: var(--bg-elevated);
}

/* ============================================================================
   MAIN WORKSPACE & CLEAN SIDEBAR
   ============================================================================ */
.app-layout {
  max-width: 1560px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr);
  gap: 2rem;
  padding: 1.5rem;
  align-items: start;
}

.step-sidebar {
  position: sticky;
  top: 80px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 0.85rem;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.sidebar-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}

.sidebar-close-mobile {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
}

.sidebar-heading {
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
}

.step-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-stage-label {
  font-family: var(--font-display);
  font-size: 0.67rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand-indigo);
  padding: 0.75rem 0.5rem 0.3rem;
  margin-top: 0.35rem;
  border-top: 1px solid var(--border-color);
}

.sidebar-stage-label:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0.25rem;
}

.step-nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.44rem 0.55rem;
  border-radius: var(--radius-xs);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.81rem;
  font-weight: 500;
  transition: all 0.14s ease;
  min-width: 0;
}

.step-nav-link span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.step-nav-link.active {
  background: var(--brand-indigo-soft);
  color: var(--brand-indigo);
  font-weight: 700;
}

.step-num-badge {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.69rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-nav-link.active .step-num-badge {
  background: var(--brand-indigo);
  border-color: var(--brand-indigo);
  color: #090B10;
}

.color-legend-box {
  margin-top: 1rem;
  padding: 0.85rem 0.5rem 0.25rem;
  border-top: 1px solid var(--border-color);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.74rem;
  color: var(--text-secondary);
  margin-bottom: 0.32rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

@media (max-width: 1080px) {
  .app-layout {
    grid-template-columns: minmax(0, 1fr);
    padding: 1rem;
  }
  .step-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 290px;
    max-height: 100vh;
    z-index: 500;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    transform: translateX(-105%);
    transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-lg);
  }
  .step-sidebar.mobile-open {
    transform: translateX(0);
  }
  .sidebar-close-mobile {
    display: inline-block;
  }
}

/* ============================================================================
   HERO BANNER & STAGE FILTER BAR
   ============================================================================ */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  min-width: 0;
}

.hero-banner {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0D1322 0%, #131C31 55%, #1E152A 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2.5rem;
  box-shadow: var(--shadow-md);
  color: #F8FAFC;
}

.hero-banner::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.32rem 0.85rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #7DD3FC;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

.hero-banner h1 {
  font-size: clamp(1.75rem, 3vw, 2.55rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
  color: #FFFFFF;
}

.hero-gradient-text {
  background: linear-gradient(90deg, #38BDF8 0%, #FB7185 55%, #FBBF24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-banner p {
  font-size: 0.98rem;
  color: #CBD5E1;
  max-width: 72ch;
  line-height: 1.65;
  margin-bottom: 1.35rem;
}

.hero-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #F8FAFC;
  cursor: pointer;
  transition: all 0.16s ease;
}

.hero-action-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-1px);
}

.hero-action-btn.primary {
  background: #38BDF8;
  border-color: #38BDF8;
  color: #090B10;
}

.hero-action-btn.primary:hover {
  background: #7DD3FC;
}

/* Stage Filter Bar */
.stage-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  overflow-x: auto;
  padding: 0.5rem 0.6rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  scrollbar-width: none;
}

.stage-filter-bar::-webkit-scrollbar {
  display: none;
}

.stage-pill {
  padding: 0.48rem 0.9rem;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.stage-pill.active {
  background: var(--brand-indigo-soft);
  border-color: var(--masc-border);
  color: var(--brand-indigo);
}

/* ============================================================================
   LEARNING SECTIONS & HEADERS
   ============================================================================ */
.learning-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 84px;
  min-width: 0;
}

.learning-section.hidden-by-stage {
  display: none !important;
}

@media (max-width: 640px) {
  .learning-section {
    padding: 1.25rem;
    border-radius: var(--radius-lg);
  }
  .hero-banner {
    padding: 1.5rem;
  }
}

.section-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 1.65rem;
}

.section-step-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  background: var(--brand-indigo-soft);
  border: 1px solid var(--masc-border);
  color: var(--brand-indigo);
  margin-bottom: 0.65rem;
}

.section-title {
  font-size: clamp(1.35rem, 2.1vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.94rem;
  margin-top: 0.45rem;
  max-width: 78ch;
  line-height: 1.6;
}

/* ============================================================================
   ZERO-OVERLAP CARDS, GRIDS & FLEX SAFEGUARDS
   ============================================================================ */
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 1.1rem;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 310px), 1fr));
  gap: 1.2rem;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: 1.25rem;
}

.visual-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.visual-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

/* Tame heavy inline borders into sleek modern accents */
.visual-card.vowel-card {
  border-left: 3px solid #FB7185;
  background: linear-gradient(145deg, var(--fem-bg), var(--bg-elevated));
}

.visual-card.consonant-card {
  border-left: 3px solid #38BDF8;
}

.visual-card.masc-card {
  border: 1px solid var(--masc-border);
  background: linear-gradient(160deg, var(--masc-bg), var(--bg-elevated));
}

.visual-card.fem-card {
  border: 1px solid var(--fem-border);
  background: linear-gradient(160deg, var(--fem-bg), var(--bg-elevated));
}

.visual-card.neut-card {
  border: 1px solid var(--neut-border);
  background: linear-gradient(160deg, var(--neut-bg), var(--bg-elevated));
}

.visual-card.verb-card {
  border: 1px solid var(--verb-border);
  background: linear-gradient(160deg, var(--verb-bg), var(--bg-elevated));
}

/* CRITICAL ZERO-OVERLAP RULE FOR CARD INNER ROWS:
   Ensure any flex row inside a card allows text to wrap and shrink cleanly
   without colliding with badges or speaker buttons! */
.visual-card div[style*="display:flex"],
.fill-blank-card div[style*="display:flex"],
.interactive-widget div[style*="display:flex"] {
  gap: 0.55rem;
  min-width: 0;
}

.visual-card div[style*="justify-content:space-between"] {
  align-items: flex-start !important;
  flex-wrap: wrap;
}

.visual-card div[style*="justify-content:space-between"] > :first-child {
  flex: 1 1 140px;
  min-width: 0;
}

/* ============================================================================
   LEGO BLOCKS, BADGES & AUDIO SPEAKER BUTTON
   ============================================================================ */
.visual-hint-banner {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--brand-indigo);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.2rem;
  margin-bottom: 1.35rem;
  font-size: 0.88rem;
  line-height: 1.65;
}

.lego-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.38rem;
  margin: 0.4rem 0;
}

.lego-stem {
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 0.28rem 0.65rem;
  border-radius: 7px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.84rem;
  line-height: 1.3;
}

.lego-plus {
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.lego-ending {
  display: inline-block;
  background: rgba(251, 113, 133, 0.18);
  border: 1px solid rgba(251, 113, 133, 0.45);
  color: #FDA4AF;
  padding: 0.26rem 0.65rem;
  border-radius: 7px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.84rem;
  line-height: 1.3;
}

:root:not([data-theme="dark"]) .lego-ending {
  background: rgba(225, 29, 72, 0.12);
  color: #BE123C;
}

.lego-ending.blue {
  background: rgba(56, 189, 248, 0.18);
  border-color: rgba(56, 189, 248, 0.45);
  color: #7DD3FC;
}

:root:not([data-theme="dark"]) .lego-ending.blue {
  background: rgba(37, 99, 235, 0.12);
  color: #1D4ED8;
}

.lego-ending.emerald {
  background: rgba(52, 211, 153, 0.18);
  border-color: rgba(52, 211, 153, 0.45);
  color: #6EE7B7;
}

:root:not([data-theme="dark"]) .lego-ending.emerald {
  background: rgba(5, 150, 105, 0.12);
  color: #047857;
}

.lego-ending.amber {
  background: rgba(251, 191, 36, 0.18);
  border-color: rgba(251, 191, 36, 0.45);
  color: #FDE68A;
}

:root:not([data-theme="dark"]) .lego-ending.amber {
  background: rgba(217, 119, 6, 0.12);
  color: #B45309;
}

.card-icon-xl {
  font-size: 1.65rem;
  line-height: 1;
}

.phonetic-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-indigo);
  background: var(--masc-bg);
  border: 1px solid var(--masc-border);
  padding: 0.14rem 0.5rem;
  border-radius: 6px;
  line-height: 1.35;
}

.gender-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-family: var(--font-display);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  line-height: 1.3;
  flex-shrink: 0;
  max-width: 100%;
}

.gender-badge.M { background: var(--masc-bg); color: var(--masc-text); border: 1px solid var(--masc-border); }
.gender-badge.F { background: var(--fem-bg); color: var(--fem-text); border: 1px solid var(--fem-border); }
.gender-badge.N { background: var(--neut-bg); color: var(--neut-text); border: 1px solid var(--neut-border); }
.gender-badge.PL { background: var(--plur-bg); color: var(--plur-text); border: 1px solid var(--plur-border); }

/* Sleek Non-Overlapping Speaker Button */
.speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  min-height: 30px;
  min-width: 30px;
  padding: 0.24rem 0.58rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  white-space: nowrap;
  margin-left: auto;
}

.speak-btn:hover {
  background: var(--brand-indigo);
  color: #090B10;
  border-color: var(--brand-indigo);
  transform: scale(1.04);
}

.speak-btn.is-playing {
  background: var(--brand-crimson);
  color: #FFFFFF;
  border-color: var(--brand-crimson);
  box-shadow: 0 0 0 3px var(--brand-crimson-soft);
  animation: speakPulse 1.1s infinite ease-in-out;
}

@keyframes speakPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

/* ============================================================================
   TWO-TIER BILINGUAL SENTENCES & NON-OVERLAPPING INLINE HIGHLIGHTS
   ============================================================================ */
.bilingual-wrap {
  display: block;
  width: 100%;
  min-width: 0;
  line-height: 1.55;
}

.pl-line {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

.en-sub-pill {
  display: block;
  margin-top: 0.26rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  border-left: 2px solid var(--masc-border);
  padding-left: 0.55rem;
  line-height: 1.45;
  overflow-wrap: break-word;
}

[data-theme="dark"] .en-sub-pill {
  color: #93C5FD;
}

/* CRITICAL FIX: Use `display: inline` + `box-decoration-break: clone`
   instead of `inline-block` so highlighted words flow with normal line height
   and NEVER overlap vertically across lines! */
.hl-prep,
.hl-neg,
.hl-end,
.hl-verb {
  display: inline;
  padding: 0.05em 0.32em;
  border-radius: 4px;
  font-weight: 700;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.hl-prep {
  background: rgba(56, 189, 248, 0.15);
  color: #7DD3FC;
}

:root:not([data-theme="dark"]) .hl-prep {
  background: rgba(37, 99, 235, 0.10);
  color: #1D4ED8;
}

.hl-neg {
  background: rgba(251, 113, 133, 0.18);
  color: #FDA4AF;
}

:root:not([data-theme="dark"]) .hl-neg {
  background: rgba(225, 29, 72, 0.10);
  color: #BE123C;
}

.hl-end {
  background: rgba(251, 191, 36, 0.18);
  color: #FDE68A;
  font-family: var(--font-mono);
  font-size: 0.92em;
}

:root:not([data-theme="dark"]) .hl-end {
  background: rgba(217, 119, 6, 0.12);
  color: #B45309;
}

.hl-verb {
  background: rgba(52, 211, 153, 0.16);
  color: #6EE7B7;
}

:root:not([data-theme="dark"]) .hl-verb {
  background: rgba(5, 150, 105, 0.10);
  color: #047857;
}

/* ============================================================================
   GRAMMAR CHEAT-SHEET TABLE
   ============================================================================ */
.grammar-cheat-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 0.5rem;
  min-width: 720px;
}

.grammar-cheat-table th {
  text-align: left;
  font-family: var(--font-display);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0.45rem 0.85rem;
}

.grammar-cheat-table td {
  background: var(--bg-subtle);
  padding: 0.75rem 0.85rem;
  font-size: 0.83rem;
  vertical-align: top;
  line-height: 1.55;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.grammar-cheat-table tr td:first-child {
  border-left: 1px solid var(--border-color);
  border-radius: 10px 0 0 10px;
}

.grammar-cheat-table tr td:last-child {
  border-right: 1px solid var(--border-color);
  border-radius: 0 10px 10px 0;
}

/* ============================================================================
   3-MODE INLINE PRACTICE STUDIO
   ============================================================================ */
.inline-practice-studio {
  margin-top: 2.25rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
}

.practice-studio-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.practice-mode-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.practice-tab-btn {
  padding: 0.48rem 0.95rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-strong);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.practice-tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--brand-indigo);
}

.practice-tab-btn.active {
  background: var(--brand-indigo);
  color: #090B10;
  border-color: var(--brand-indigo);
}

/* Mode 1: Flip Flashcards */
.flashcard-deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 1rem;
}

.flip-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  min-height: 165px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.18s ease;
  user-select: none;
}

.flip-card:hover {
  border-color: var(--brand-indigo);
  transform: translateY(-2px);
}

.flip-card.is-flipped {
  background: var(--verb-bg);
  border-color: var(--verb-border);
}

/* Mode 2: Fill in the Blank */
.fill-blank-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  margin-bottom: 0.85rem;
}

.quiz-option-btn {
  width: 100%;
  text-align: left;
  padding: 0.68rem 0.95rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.4rem;
  transition: all 0.14s ease;
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--brand-indigo);
  background: var(--masc-bg);
}

.quiz-option-btn.correct {
  background: var(--verb-bg);
  border-color: #10B981;
  color: var(--verb-text);
}

.quiz-option-btn.wrong {
  background: var(--fem-bg);
  border-color: #F43F5E;
  color: var(--fem-text);
}

/* Mode 3: Lego Sentence Builder */
.sentence-builder-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  margin-bottom: 0.85rem;
}

.sentence-dropzone {
  min-height: 52px;
  background: var(--bg-subtle);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin: 0.75rem 0;
}

.word-tile {
  padding: 0.4rem 0.8rem;
  border-radius: 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--masc-border);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.12s ease;
}

.word-tile:hover {
  background: var(--brand-indigo);
  color: #090B10;
  border-color: var(--brand-indigo);
}

.word-tile.used {
  opacity: 0.28;
  pointer-events: none;
}

/* ============================================================================
   INTERACTIVE WIDGETS, SIMULATORS & MIND MAP GALLERY
   ============================================================================ */
.interactive-widget {
  background: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.45rem;
  margin: 1.4rem 0;
}

.widget-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.widget-tab-btn {
  padding: 0.45rem 0.88rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.79rem;
  cursor: pointer;
  transition: all 0.14s ease;
}

.widget-tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.widget-tab-btn.active {
  background: var(--brand-indigo);
  color: #090B10;
  border-color: var(--brand-indigo);
}

.room-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 245px), 1fr));
  gap: 0.9rem;
}

.room-item-card {
  background: var(--bg-secondary);
  border: 1px solid var(--verb-border);
  border-radius: var(--radius-md);
  padding: 1.05rem;
  cursor: pointer;
  transition: all 0.16s ease;
}

.room-item-card:hover {
  transform: translateY(-2px);
}

.room-item-card.is-absent {
  border-color: var(--fem-border);
  background: var(--fem-bg);
}

.search-input {
  width: 100%;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-subtle);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.search-input:focus {
  border-color: var(--brand-indigo);
}

/* Mind Map Gallery & Lightbox */
.mindmap-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: zoom-in;
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.mindmap-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-indigo);
  box-shadow: var(--shadow-md);
}

.mindmap-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--border-color);
}

.lightbox-modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 15, 0.92);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: zoom-out;
}

.lightbox-modal.open {
  display: flex;
}

.lightbox-modal img {
  max-width: 95vw;
  max-height: 90vh;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
}