/* StudyBuddy Design System - Modern Glassmorphism Aesthetic */
:root {
  --bg-primary: #0a0d18;
  --bg-secondary: #101528;
  --bg-card: rgba(18, 24, 44, 0.75);
  --bg-card-hover: rgba(26, 34, 62, 0.85);
  --bg-input: rgba(13, 17, 33, 0.9);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.6);
  --border-glow: rgba(99, 102, 241, 0.3);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --accent-glow: 0 0 25px rgba(99, 102, 241, 0.35);
  
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --success-border: rgba(16, 185, 129, 0.3);
  
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  
  --streak-flame: #ff6b35;
  --streak-gradient: linear-gradient(135deg, #ff4500, #ff8c00, #ffd700);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 0 1px 1px rgba(255, 255, 255, 0.05);
}

[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-input: #ffffff;
  
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(99, 102, 241, 0.8);
  --border-glow: rgba(99, 102, 241, 0.2);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.08), 0 0 1px 1px rgba(0, 0, 0, 0.05);
}

/* Reset and Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  background-image: 
    radial-gradient(at 10% 20%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
    radial-gradient(at 90% 80%, rgba(217, 70, 239, 0.09) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(139, 92, 246, 0.05) 0px, transparent 60%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Confetti Canvas */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* App Container */
.app-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem 1.25rem;
}

/* Header & Nav */
header.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.2rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  font-size: 1.9rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  animation: floatIcon 4s ease-in-out infinite;
}

@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.brand-title {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .brand-title {
  background: linear-gradient(135deg, #0f172a 30%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Header Right: Streak Badge and Utilities */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.streak-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 107, 53, 0.12);
  border: 1px solid rgba(255, 107, 53, 0.35);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s ease;
  user-select: none;
}
.streak-badge:hover {
  transform: scale(1.04);
  box-shadow: 0 0 15px rgba(255, 107, 53, 0.35);
  background: rgba(255, 107, 53, 0.2);
}

.streak-flame {
  font-size: 1.25rem;
  display: inline-block;
  animation: flicker 1.8s ease-in-out infinite alternate;
}

@keyframes flicker {
  0% { transform: scale(1) rotate(-2deg); filter: drop-shadow(0 0 2px #ff4500); }
  50% { transform: scale(1.15) rotate(3deg); filter: drop-shadow(0 0 6px #ffa500); }
  100% { transform: scale(1.05) rotate(-1deg); filter: drop-shadow(0 0 4px #ff6347); }
}

.streak-count {
  font-weight: 700;
  font-size: 0.95rem;
  color: #ff8c00;
  font-family: var(--font-mono);
}

.streak-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Header Action Buttons */
.btn-icon-header {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.05rem;
  transition: all 0.2s ease;
}
.btn-icon-header:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}
.btn-icon-header.active {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.15);
}

/* Navigation Tabs */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.45rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  margin-bottom: 2.2rem;
  box-shadow: var(--shadow-card);
  overflow-x: auto;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.nav-tab.active {
  color: #ffffff;
  background: var(--accent-gradient);
  box-shadow: var(--accent-glow);
}

.tab-icon {
  font-size: 1.15rem;
}

/* Tab Views */
.tab-content {
  display: none;
  animation: fadeIn 0.3s ease-out forwards;
}

.tab-content.active {
  display: block;
}

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

/* ============================================================
   POMODORO TIMER SECTION
   ============================================================ */
.pomo-wrapper {
  max-width: 650px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.pomo-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-card);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.pomo-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

/* Mode Switcher */
.timer-modes {
  display: inline-flex;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem;
  border-radius: 999px;
  margin-bottom: 2rem;
  gap: 0.25rem;
}
[data-theme="light"] .timer-modes {
  background: rgba(0, 0, 0, 0.05);
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.mode-btn:hover {
  color: var(--text-main);
}

.mode-btn.active {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}
[data-theme="light"] .mode-btn.active {
  background: #ffffff;
  color: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Timer Circle Visualization */
.timer-circle-wrap {
  position: relative;
  width: 280px;
  height: 280px;
  margin: 0 auto 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timer-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.06);
  stroke-width: 8;
}
[data-theme="light"] .timer-track {
  stroke: rgba(0, 0, 0, 0.06);
}

.timer-progress {
  fill: none;
  stroke: url(#timerGradient);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s ease;
  filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.timer-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 2;
}

.timer-digits {
  font-family: var(--font-mono);
  font-size: 3.8rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text-main);
  text-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
  line-height: 1.1;
}

.timer-status {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
}

/* Current Focus Task Input */
.current-task-box {
  margin-bottom: 2rem;
  position: relative;
}

.task-input {
  width: 100%;
  max-width: 420px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.1rem;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  text-align: center;
  outline: none;
  transition: all 0.2s ease;
}

.task-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.task-input::placeholder {
  color: var(--text-dim);
}

/* Timer Control Buttons */
.timer-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.btn-primary {
  background: var(--accent-gradient);
  border: none;
  color: #ffffff;
  padding: 0.85rem 2.2rem;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  box-shadow: 0 6px 20px -2px rgba(99, 102, 241, 0.4);
  transition: all 0.25s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -2px rgba(99, 102, 241, 0.55);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Secondary Quick bar (Settings, Ambience, Session Dots) */
.pomo-secondary-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1.2rem 1.8rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.pomo-session-tracker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.session-dots {
  display: flex;
  gap: 0.35rem;
}

.session-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  transition: all 0.3s ease;
}

.session-dot.completed {
  background: #f43f5e;
  box-shadow: 0 0 8px #f43f5e;
}

.ambience-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.ambience-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.ambience-btn.active {
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  border-color: rgba(99, 102, 241, 0.4);
}

/* ============================================================
   FLASHCARDS SECTION
   ============================================================ */
.flashcards-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.deck-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem 1.4rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.deck-select-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.deck-select-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
}

.custom-select {
  background: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}

.custom-select:focus {
  border-color: var(--accent-primary);
}

.deck-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Flashcard Viewer (3D Perspective) */
.study-viewport {
  perspective: 1200px;
  max-width: 640px;
  margin: 1rem auto;
  width: 100%;
}

.flashcard-3d {
  width: 100%;
  min-height: 340px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border-radius: var(--radius-xl);
}

.flashcard-3d.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: 2.2rem 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-face-back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, rgba(22, 28, 52, 0.9), rgba(15, 20, 38, 0.95));
  border-color: rgba(99, 102, 241, 0.25);
}
[data-theme="light"] .card-face-back {
  background: linear-gradient(145deg, #ffffff, #f8fafc);
}

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

.card-type-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.card-type-tag.answer-tag {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.3);
}

.card-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-dim);
}
.card-status-dot.mastered {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}
.card-status-dot.review {
  background: var(--warning);
  box-shadow: 0 0 8px var(--warning);
}

.card-content-center {
  margin: auto 0;
  text-align: center;
}

.card-main-text {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
}

.card-instruction {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

/* Card Action Bar */
.card-actions-bar {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.review-btn {
  flex: 1;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-need-review {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.3);
  color: #f87171;
}
.btn-need-review:hover {
  background: rgba(239, 68, 68, 0.25);
  transform: translateY(-2px);
}

.btn-mastered {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
  color: #34d399;
}
.btn-mastered:hover {
  background: rgba(16, 185, 129, 0.25);
  transform: translateY(-2px);
}

.btn-flip {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.85rem 1.2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-flip:hover {
  background: rgba(255, 255, 255, 0.14);
}

/* Card Progress Bar */
.card-progress-section {
  max-width: 640px;
  margin: 1.2rem auto 0;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.progress-bar-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}
[data-theme="light"] .progress-bar-track {
  background: rgba(0, 0, 0, 0.08);
}

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

/* Flashcard Table / Manager */
.deck-manager-view {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.deck-manager-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.cards-table-container {
  overflow-x: auto;
}

.cards-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.cards-table th {
  padding: 0.75rem 1rem;
  color: var(--text-dim);
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
}

.cards-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
}
[data-theme="light"] .cards-table td {
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.cards-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-main);
}

.btn-table-action {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1rem;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.btn-table-action:hover {
  color: var(--danger);
  background: var(--danger-bg);
}

/* ============================================================
   QUIZ SECTION
   ============================================================ */
.quiz-wrapper {
  max-width: 680px;
  margin: 0 auto;
}

.quiz-setup-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.2rem;
  box-shadow: var(--shadow-card);
}

.quiz-hero-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.quiz-hero-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1.8rem;
}

.quiz-mode-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}
@media (max-width: 600px) {
  .quiz-mode-cards {
    grid-template-columns: 1fr;
  }
}

.quiz-mode-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: left;
}
.quiz-mode-box:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}
.quiz-mode-box.selected {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.quiz-mode-box h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}
.quiz-mode-box p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Active Quiz Player */
.quiz-player-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.4rem 2rem;
  box-shadow: var(--shadow-card);
}

.quiz-player-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.quiz-score-badge {
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
}

.quiz-question-box {
  margin-bottom: 2rem;
}

.quiz-question-prompt {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.quiz-option-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.quiz-option-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--border-focus);
  transform: translateX(4px);
}

.quiz-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
  font-size: 0.82rem;
  flex-shrink: 0;
}

/* Option States */
.quiz-option-btn.correct {
  background: rgba(16, 185, 129, 0.25) !important;
  border-color: #10b981 !important;
  color: #34d399 !important;
}
.quiz-option-btn.correct .quiz-opt-letter {
  background: #10b981;
  color: #ffffff;
}

.quiz-option-btn.incorrect {
  background: rgba(239, 68, 68, 0.25) !important;
  border-color: #ef4444 !important;
  color: #f87171 !important;
  animation: shake 0.4s ease;
}
.quiz-option-btn.incorrect .quiz-opt-letter {
  background: #ef4444;
  color: #ffffff;
}

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

.quiz-feedback-box {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  line-height: 1.5;
  display: none;
}
.quiz-feedback-box.active {
  display: block;
}

/* Quiz Results Card */
.quiz-results-card {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}

.result-score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  background: var(--accent-gradient);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--accent-glow);
}

.score-percent {
  font-size: 2.4rem;
  font-weight: 800;
  font-family: var(--font-mono);
  line-height: 1;
}

.score-fraction {
  font-size: 0.85rem;
  opacity: 0.85;
}

/* ============================================================
   PROGRESS & STREAK SECTION
   ============================================================ */
.progress-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.col-full { grid-column: span 12; }
.col-8 { grid-column: span 8; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }

@media (max-width: 900px) {
  .col-8, .col-4, .col-6 { grid-column: span 12; }
}

/* Streak Hero Banner */
.streak-hero-card {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15) 0%, rgba(255, 140, 0, 0.05) 100%), var(--bg-card);
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  box-shadow: 0 10px 30px -5px rgba(255, 107, 53, 0.15);
}

.streak-hero-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.streak-giant-flame {
  font-size: 4rem;
  animation: flicker 1.8s ease-in-out infinite alternate;
}

.streak-days-num {
  font-size: 2.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  background: var(--streak-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.streak-hero-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 0.25rem;
}

.streak-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Week Days Streak Strip */
.week-strip {
  display: flex;
  gap: 0.65rem;
  align-items: center;
}

.week-day-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem 0.55rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  min-width: 44px;
}
.week-day-pill.completed {
  background: rgba(255, 107, 53, 0.15);
  border-color: rgba(255, 107, 53, 0.4);
}
.week-day-pill.today {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.25);
}

.day-name {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
}

.day-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
}
.week-day-pill.completed .day-indicator {
  background: #ff6b35;
  color: #ffffff;
}

/* Stat Metric Cards */
.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.4rem;
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  transition: transform 0.2s ease;
}
.stat-card:hover {
  transform: translateY(-2px);
}

.stat-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}
.icon-pomo { background: rgba(244, 63, 94, 0.15); color: #f43f5e; }
.icon-cards { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.icon-quiz { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-time { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Daily Goals Card */
.goals-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.8rem;
  box-shadow: var(--shadow-card);
}

.goals-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-top: 1.2rem;
}

.goal-item-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.goal-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 600;
}

/* History / Activity Log */
.history-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.8rem;
  box-shadow: var(--shadow-card);
}

.activity-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.2rem;
  max-height: 280px;
  overflow-y: auto;
  padding-right: 0.4rem;
}

.timeline-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
}

.timeline-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.timeline-time {
  font-size: 0.76rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ============================================================
   MODALS & DIALOGS
   ============================================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  display: flex;
  opacity: 1;
}

.modal-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.2rem;
  max-width: 520px;
  width: 100%;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}
.modal-overlay.open .modal-window {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  transition: color 0.2s;
}
.btn-close-modal:hover {
  color: var(--text-main);
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

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

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

.form-input, .form-textarea {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.2s;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--accent-primary);
}
.form-textarea {
  resize: vertical;
  min-height: 85px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 9998;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Keyboard hint chips */
.kbd-chip {
  display: inline-block;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}