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

:root {
  /* DARK MODE DEFAULT TOKENS - ELECTRIC CYAN & NEON VIOLET THEME */
  --bg-app: #090B10;
  --bg-surface: #111520;
  --bg-surface-hover: #1A202E;
  --bg-surface-elevated: #222A3C;
  --border-color: #222A3C;
  --border-color-strong: #333F58;

  --text-main: #F9FAFB;
  --text-sub: #9CA3AF;
  --text-muted: #6B7280;

  --accent-green: #06B6D4;
  --accent-green-hover: #0891B2;
  --accent-green-glow: rgba(6, 182, 212, 0.25);
  
  --accent-cyan: #06B6D4;
  --accent-violet: #8B5CF6;

  --accent-orange: #FF6B4A;
  --accent-orange-glow: rgba(255, 107, 74, 0.2);

  --status-error: #F43F5E;
  --status-error-bg: rgba(244, 63, 94, 0.15);

  --status-warning: #F59E0B;
  --status-warning-bg: rgba(245, 158, 11, 0.15);

  --status-success: #06B6D4;
  --status-success-bg: rgba(6, 182, 212, 0.15);

  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
  --font-code: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 12px 35px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(6, 182, 212, 0.35);

  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* LIGHT MODE OVERRIDES */
[data-theme="light"] {
  --bg-app: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-hover: #F1F5F9;
  --bg-surface-elevated: #E2E8F0;
  --border-color: #E2E8F0;
  --border-color-strong: #CBD5E1;

  --text-main: #0F172A;
  --text-sub: #475569;
  --text-muted: #94A3B8;

  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color-strong) var(--bg-app);
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-ui);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* TYPOGRAPHY & CODE SYNTAX */
code, pre, .mono {
  font-family: var(--font-code);
}

code {
  background-color: var(--bg-surface-elevated);
  color: var(--accent-green);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border-color);
}

.code-block {
  background-color: #0B0D10;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  overflow-x: auto;
  color: #E5E7EB;
  margin: 1rem 0;
  font-size: 0.95rem;
}

/* TOP NAVBAR */
.top-navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.75rem;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  letter-spacing: -0.02em;
  cursor: pointer;
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.18) 0%, rgba(139, 92, 246, 0.18) 100%);
  border: 1px solid rgba(6, 182, 212, 0.35);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.25);
  transition: transform var(--transition-fast);
}

.brand-logo:hover .logo-badge {
  transform: scale(1.05);
  border-color: var(--accent-cyan);
}

.brand-logo span.sprout {
  color: var(--accent-cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 0.9rem;
}

.stat-streak { color: var(--status-warning); }
.stat-xp { color: var(--accent-green); }
.stat-level { color: #8B5CF6; }

.theme-toggle-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--accent-green);
}

/* BUTTONS & CTAS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  outline: none;
}

.btn:active {
  transform: translateY(2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-cyan-end, #3B82F6) 100%);
  color: #FFFFFF;
  font-weight: 700;
  box-shadow: 0 4px 20px var(--accent-cyan-glow, rgba(6, 182, 212, 0.35));
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-green-hover) 0%, var(--accent-cyan-end-hover, #2563EB) 100%);
  box-shadow: 0 6px 25px var(--accent-cyan-glow-strong, rgba(6, 182, 212, 0.5));
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-color-strong);
}

.btn-warning {
  background-color: var(--status-warning-bg);
  border-color: var(--status-warning);
  color: var(--status-warning);
}

.btn-warning:hover {
  background-color: rgba(245, 158, 11, 0.25);
}

/* SPA VIEW ROUTER CONTAINERS */
.spa-view {
  display: none;
  animation: fadeIn 0.25s ease;
}

.spa-view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* LANDING / AUTH VIEW */
.hero-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 3.5rem;
  align-items: center;
}

@media (max-width: 900px) {
  .hero-wrapper {
    grid-template-columns: 1fr;
    padding: 2rem 1rem;
  }
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-text p {
  font-size: 1.2rem;
  color: var(--text-sub);
  margin-top: 1.25rem;
  max-width: 580px;
}

.auth-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
}

.form-input {
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  border-color: var(--accent-green);
}

/* DASHBOARD LAYOUT */
.dashboard-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 65px);
}

@media (max-width: 900px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.sidebar-nav {
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(2,6,23,0.6) 100%);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  position: sticky;
  top: 65px;
  max-height: calc(100vh - 65px);
  overflow-y: auto;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

/* Module Section Card */
.tree-module {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
}

.tree-module-header {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  padding: 0.65rem 0.85rem;
  background: linear-gradient(135deg, rgba(6,182,212,0.08) 0%, rgba(139,92,246,0.06) 100%);
  border: 1px solid rgba(6,182,212,0.15);
  border-radius: 10px;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tree-module-header .mod-icon {
  font-size: 1rem;
}

/* Vertical Timeline Connector */
.tree-lessons-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  position: relative;
  padding-left: 0.5rem;
  margin-left: 0.85rem;
  border-left: 2px solid rgba(6,182,212,0.1);
}

.tree-lesson-node {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.85rem;
  border-radius: 8px;
  color: var(--text-sub);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  position: relative;
  line-height: 1.35;
}

/* Timeline dot on the left edge */
.tree-lesson-node::before {
  content: '';
  position: absolute;
  left: -0.85rem;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 2px solid rgba(6,182,212,0.2);
  transition: all 0.2s ease;
  z-index: 1;
}

.tree-lesson-node .lesson-status-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
  width: 22px;
  text-align: center;
}

.tree-lesson-node .lesson-title-text {
  flex: 1;
}

.tree-lesson-node:hover {
  background: rgba(6,182,212,0.06);
  color: var(--text-main);
  border-color: rgba(6,182,212,0.12);
}

.tree-lesson-node:hover::before {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 6px rgba(6,182,212,0.3);
}

.tree-lesson-node.active {
  background: rgba(6,182,212,0.1);
  color: var(--accent-cyan);
  border-color: rgba(6,182,212,0.25);
  font-weight: 600;
}

.tree-lesson-node.active::before {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(6,182,212,0.5);
}

.tree-lesson-node.completed {
  color: #34D399;
}

.tree-lesson-node.completed::before {
  background: #10B981;
  border-color: #10B981;
  box-shadow: 0 0 6px rgba(16,185,129,0.35);
}

.tree-lesson-node.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

.tree-lesson-node.locked::before {
  background: var(--bg-surface);
  border-color: rgba(148,163,184,0.15);
}

.dash-main-area {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1000px;
}

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.badge-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-fast);
}

.badge-card.locked {
  opacity: 0.45;
}

.badge-card.earned {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px var(--accent-green-glow);
}

/* LESSON WORKSPACE VIEW */
.lesson-workspace {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 65px);
  height: auto;
  overflow-y: auto;
}

.lesson-top-bar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-track {
  width: 240px;
  height: 10px;
  background-color: var(--bg-surface-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-green);
  border-radius: var(--radius-full);
  transition: width var(--transition-smooth);
}

.lesson-split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  min-height: 520px;
  overflow: visible;
}

@media (max-width: 1000px) {
  .lesson-split-panel {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .explanation-panel {
    max-height: none !important;
    border-right: none !important;
    border-bottom: 1px solid var(--border-color);
  }
  .editor-preview-panel {
    border-left: none !important;
    min-height: 480px;
  }
}

.explanation-panel {
  padding: 2.5rem;
  overflow-y: auto;
  max-height: calc(100vh - 180px);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.why-it-matters {
  background-color: var(--bg-surface-elevated);
  border-left: 4px solid var(--accent-green);
  padding: 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.editor-preview-panel {
  display: grid;
  grid-template-rows: 1fr 1fr;
  background-color: #0D0E12;
  border-left: 1px solid var(--border-color);
}

.pane-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background-color: white;
}

.bottom-action-bar {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 1rem 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* QUIZ VIEW & TYPES */
.quiz-container {
  max-width: 760px;
  margin: 2rem auto 6rem auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.quiz-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.options-stack {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.quiz-opt-btn {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.quiz-opt-btn:hover {
  border-color: var(--accent-green);
  background-color: var(--bg-surface-hover);
}

.quiz-opt-btn.selected {
  border-color: var(--accent-green);
  background-color: var(--accent-green-glow);
  color: var(--accent-green);
}

.quiz-opt-btn.correct {
  background-color: var(--status-success-bg);
  border-color: var(--status-success);
  color: var(--status-success);
}

.quiz-opt-btn.incorrect {
  background-color: var(--status-error-bg);
  border-color: var(--status-error);
  color: var(--status-error);
}

/* FEEDBACK DRAWER */
.feedback-box {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.feedback-box.correct {
  background-color: var(--status-success-bg);
  border: 1px solid var(--status-success);
  color: var(--status-success);
}

.feedback-box.incorrect {
  background-color: var(--status-error-bg);
  border: 1px solid var(--status-error);
  color: var(--status-error);
}

/* SEARCH REFERENCE MODAL */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.reference-modal-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 680px;
  max-height: 80vh;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-card);
}

.reference-list {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.reference-item {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-sm);
}

/* CODEMIRROR OVERRIDES */
.CodeMirror {
  height: 100% !important;
  font-family: var(--font-code) !important;
  font-size: 0.95rem !important;
  background-color: #0B0D10 !important;
  color: #E5E7EB !important;
}

.CodeMirror-gutters {
  background-color: #0F1115 !important;
  border-right: 1px solid var(--border-color) !important;
}

/* DRAG AND DROP BLOCKLY PUZZLES */
.blockly-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 1rem 0;
}

.blockly-pool, .blockly-dropzone {
  min-height: 80px;
  background: rgba(0, 0, 0, 0.25);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.blockly-dropzone.drag-over {
  border-color: var(--accent-green);
  background: var(--accent-green-glow);
}

.blockly-block {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color-strong);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: grab;
  user-select: none;
  font-family: var(--font-code);
  font-size: 0.9rem;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.blockly-block:active {
  cursor: grabbing;
  transform: scale(0.98);
}

.blockly-block.dragging {
  opacity: 0.5;
  border-color: var(--accent-green);
}

/* SETTINGS MODAL */
.settings-modal-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 480px;
  padding: 2rem;
  box-shadow: var(--shadow-card);
  max-height: 90vh;
  overflow-y: auto;
}

/* EMBEDDED CONSOLE LOG TERMINAL */
.console-panel {
  background: #050608;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 180px;
  transition: height 0.2s ease;
}

.console-header {
  background: var(--bg-surface);
  padding: 0.4rem 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-sub);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.console-logs {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 1rem;
  font-family: var(--font-code);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.console-line {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.4;
  word-break: break-all;
}

.console-line.info { color: #34d399; }
.console-line.warn { color: #f59e0b; background: rgba(245, 158, 11, 0.1); padding: 0.1rem 0.4rem; border-radius: 4px; }
.console-line.error { color: #f43f5e; background: rgba(244, 63, 94, 0.15); padding: 0.1rem 0.4rem; border-radius: 4px; }

/* GITHUB-STYLE 7-DAY STREAK HEATMAP */
.heatmap-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.heatmap-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.heatmap-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-sub);
  text-transform: uppercase;
}

.heatmap-tile {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.heatmap-tile.active {
  background: var(--accent-green);
  border-color: #34D399;
  box-shadow: 0 0 12px var(--accent-green-glow);
  color: #0F1115;
}

.heatmap-tile.inactive {
  opacity: 0.4;
}

/* RESPONSIVE VIEWPORT CONTAINER (SANDBOX) */
.viewport-frame-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: stretch;
  background: #050608;
  overflow: hidden;
  transition: all var(--transition-smooth);
}

.viewport-frame-wrapper.mode-desktop { width: 100%; max-width: 100%; }
.viewport-frame-wrapper.mode-tablet { width: 768px; margin: 0 auto; border-left: 2px solid var(--border-color); border-right: 2px solid var(--border-color); }
.viewport-frame-wrapper.mode-mobile { width: 375px; margin: 0 auto; border-left: 2px solid var(--border-color); border-right: 2px solid var(--border-color); }

/* DAILY QUESTS BOUNTIES CARD */
.quest-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quest-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
}

.quest-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-main);
}

.quest-reward {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

@media (max-width: 600px) {
  .brand-logo .brand-name {
    display: none !important;
  }
}

/* ROADMAP BUTTON DESKTOP VISIBILITY RULE */
#open-mobile-roadmap-btn {
  display: none !important;
}

/* OFF-CANVAS MOBILE ROADMAP SLIDE-IN SIDEBAR */
.sidebar-drawer {
  position: fixed;
  top: 0;
  left: -340px;
  width: 300px;
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  z-index: 10000;
  transition: left 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 10px 0 35px rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
}

.sidebar-drawer.active {
  left: 0;
}

.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: none;
}

.sidebar-backdrop.active {
  display: block;
}

/* COMPREHENSIVE MOBILE RESPONSIVE MEDIA QUERIES (<850px & <480px) */
@media (max-width: 850px) {
  #open-mobile-roadmap-btn {
    display: inline-flex !important;
  }

  .top-navbar {
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .nav-actions {
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 0.25rem;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
  }

  .nav-actions .btn, .nav-actions .stat-pill, .nav-actions .theme-toggle-btn {
    flex-shrink: 0;
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
  }

  .hero-wrapper {
    grid-template-columns: 1fr !important;
    gap: 2rem !important;
    padding: 2rem 1rem !important;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 2.2rem !important;
  }

  .hero-text p {
    font-size: 1rem !important;
    margin: 1rem auto !important;
  }

  .auth-card {
    padding: 1.5rem !important;
    width: 100%;
  }

  .dashboard-grid {
    grid-template-columns: 1fr !important;
  }

  .dashboard-grid .sidebar-nav {
    display: none !important;
  }

  .dash-main-area {
    padding: 1rem !important;
  }

  .dash-main-area > div[style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
  }

  .lesson-top-bar, .bottom-action-bar {
    flex-direction: column;
    gap: 0.75rem;
    align-items: stretch !important;
    text-align: center;
    padding: 0.85rem 1rem !important;
  }

  .lesson-split-panel {
    grid-template-columns: 1fr !important;
    min-height: auto !important;
  }

  .explanation-panel {
    max-height: 320px !important;
    padding: 1.25rem !important;
    border-right: none !important;
    border-bottom: 1px solid var(--border-color);
  }

  .editor-preview-panel {
    border-left: none !important;
    grid-template-rows: 260px 260px !important;
  }

  .viewport-frame-wrapper.mode-tablet,
  .viewport-frame-wrapper.mode-mobile {
    width: 100% !important;
  }

  .quiz-container {
    padding: 0 0.5rem !important;
    margin: 1rem auto 4rem auto !important;
  }

  .quiz-card {
    padding: 1.25rem !important;
  }

  .reference-modal-card, .settings-modal-card {
    width: 95vw !important;
    padding: 1.25rem !important;
    max-height: 85vh !important;
  }
}

/* Toast Notifications styling */
.toast {
  background: rgba(17, 21, 32, 0.92);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  color: var(--text-main);
  padding: 0.85rem 1.25rem;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 290px;
  max-width: 420px;
  pointer-events: auto;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
  opacity: 0;
  backdrop-filter: blur(12px);
}

.toast.active {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.toast.success {
  border-left-color: #10B981;
}

.toast.error {
  border-left-color: #F43F5E;
}

.toast.info {
  border-left-color: var(--accent-cyan);
}

.toast.warning {
  border-left-color: #F59E0B;
}

#ai-coach-response {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08) 0%, rgba(6, 182, 212, 0.04) 100%);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-left: 4px solid var(--accent-cyan);
  border-radius: 12px;
  padding: 1.25rem;
  margin-top: 1.25rem;
  box-shadow: 0 8px 25px -5px rgba(0, 0, 0, 0.4);
  font-family: var(--font-ui);
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  backdrop-filter: blur(10px);
}

/* Matching Pairs Quiz styling */
.matching-pairs-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

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

.matching-item {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  text-align: left;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-ui);
}

.matching-column#match-col-left .matching-item {
  font-family: var(--font-code);
  color: var(--accent-cyan);
}

.matching-item:hover:not(.matched):not(.selected) {
  background: var(--bg-surface-hover);
  border-color: rgba(6, 182, 212, 0.4);
}

.matching-item.selected {
  background: rgba(139, 92, 246, 0.15);
  border-color: #8B5CF6;
  color: #c084fc;
  box-shadow: 0 0 10px rgba(139, 92, 246, 0.2);
}

.matching-item.matched {
  background: rgba(16, 185, 129, 0.1);
  border-color: #10B981;
  color: #34D399;
  cursor: default;
  opacity: 0.8;
}

/* Spot the Difference Quiz styling */
.spot-diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .spot-diff-grid {
    grid-template-columns: 1fr;
  }
}

.spot-diff-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.spot-diff-card:hover:not(.selected) {
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-2px);
}

.spot-diff-card.selected {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
  background: rgba(6, 182, 212, 0.05);
}

.spot-diff-header {
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spot-diff-code-wrapper {
  padding: 0.75rem 1rem;
  background: #07090E;
  font-family: var(--font-code);
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  white-space: pre;
}

.spot-diff-desc {
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--text-sub);
  line-height: 1.4;
  flex: 1;
}

/* Shake Animation for incorrect matches */
.incorrect-shake {
  animation: shake 0.5s ease-in-out;
  border-color: #F43F5E !important;
  color: #F87171 !important;
  background: rgba(244, 63, 94, 0.1) !important;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* Timed Run styles */
.timed-progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 1rem;
  border: 1px solid rgba(255,255,255,0.03);
}

.timed-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #F59E0B, #EF4444);
  width: 100%;
  transition: width 1s linear;
}

/* Floating AI assistant widget */
.ai-float-btn {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #8B5CF6 0%, #06B6D4 100%);
  border: 1px solid rgba(255,255,255,0.25);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ai-float-btn:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 6px 25px rgba(6, 182, 212, 0.6);
}

.ai-chat-widget {
  position: fixed;
  right: 1.5rem;
  bottom: 5.5rem;
  width: 360px;
  height: 480px;
  max-width: 90vw;
  background: var(--bg-surface-elevated);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px) scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(10px);
}

.ai-chat-widget.active {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}

.ai-chat-header {
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ai-chat-dot {
  width: 8px;
  height: 8px;
  background: #10B981;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px #10B981;
}

.ai-chat-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-sub);
  cursor: pointer;
  transition: color 0.2s ease;
}

.ai-chat-close:hover {
  color: var(--text-main);
}

.ai-chat-body {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.ai-chat-bubble {
  max-width: 85%;
  padding: 0.65rem 0.85rem;
  border-radius: 12px;
  font-size: 0.82rem;
  line-height: 1.4;
  word-break: break-word;
}

.ai-chat-bubble p {
  margin: 0;
}

.ai-chat-bubble code {
  background: rgba(0,0,0,0.3);
  padding: 0.1rem 0.25rem;
  border-radius: 4px;
  font-family: var(--font-code);
  color: var(--accent-cyan);
}

.ai-chat-bubble pre {
  background: rgba(0,0,0,0.3);
  padding: 0.5rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.5rem 0;
  font-family: var(--font-code);
}

.ai-chat-incoming {
  background: rgba(255,255,255,0.05);
  color: var(--text-sub);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.ai-chat-outgoing {
  background: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.ai-chat-footer {
  border-top: 1px solid var(--border-color);
  padding: 0.75rem;
  display: flex;
  gap: 0.5rem;
  background: rgba(0,0,0,0.15);
}

.ai-chat-footer input {
  flex: 1;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.ai-chat-footer input:focus {
  border-color: #8B5CF6;
}

.ai-chat-footer button {
  background: #8B5CF6;
  border: none;
  color: white;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.ai-chat-footer button:hover {
  background: #7C3AED;
  transform: translateY(-1px);
}

/* Glassmorphism Quiz Card states */
.quiz-correct-card {
  background: rgba(16, 185, 129, 0.08) !important;
  border-color: rgba(16, 185, 129, 0.35) !important;
  box-shadow: 0 8px 32px 0 rgba(16, 185, 129, 0.1), 0 0 15px rgba(16, 185, 129, 0.2) !important;
  backdrop-filter: blur(12px) !important;
  transition: all 0.3s ease;
}

.quiz-incorrect-card {
  background: rgba(244, 63, 94, 0.08) !important;
  border-color: rgba(244, 63, 94, 0.35) !important;
  box-shadow: 0 8px 32px 0 rgba(244, 63, 94, 0.1), 0 0 15px rgba(244, 63, 94, 0.2) !important;
  backdrop-filter: blur(12px) !important;
  transition: all 0.3s ease;
}