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

:root {
  --font-primary: 'Plus Jakarta Sans', sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Colors */
  --bg-dark: #070a13;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(31, 41, 55, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Accent Colors */
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.15);
  
  --addition: #06b6d4;
  --addition-glow: rgba(6, 182, 212, 0.2);
  
  --subtraction: #f43f5e;
  --subtraction-glow: rgba(244, 63, 94, 0.2);
  
  --multiplication: #f59e0b;
  --multiplication-glow: rgba(245, 158, 11, 0.2);
  
  --division: #a855f7;
  --division-glow: rgba(168, 85, 247, 0.2);

  --correct: #10b981;
  --incorrect: #ef4444;

  /* UI properties */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(168, 85, 247, 0.08) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Glassmorphism Classes */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: var(--transition);
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

/* Navigation Header */
header {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(7, 10, 19, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
}

.lorenzo-logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  transition: var(--transition);
}

.lorenzo-logo-container:hover {
  transform: scale(1.02);
}

.lorenzo-logo-svg {
  width: 42px;
  height: 42px;
  color: rgba(255, 255, 255, 0.4);
  display: block;
}

.lorenzo-logo-text {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, #ffffff, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.user-profile-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 16px;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
}

.avatar-nav {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--division));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.btn-nav-logout {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-nav-logout:hover {
  color: var(--subtraction);
  background: rgba(244, 63, 94, 0.1);
}

/* Layout container */
main {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Login Page Styling */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 160px);
}

.auth-card {
  width: 100%;
  max-width: 450px;
  padding: 40px;
}

.auth-header {
  text-align: center;
  margin-bottom: 30px;
}

.auth-header h1 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.auth-header p {
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 16px;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
  background: rgba(255, 255, 255, 0.08);
}

.btn-primary {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), #4f46e5);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.45);
}

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

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

.auth-info-box {
  margin-top: 25px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  font-size: 13px;
  border: 1px dashed var(--border-color);
}

.auth-info-box h4 {
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--primary);
}

.auth-info-box ul {
  list-style: none;
  padding-left: 0;
}

.auth-info-box li {
  margin-bottom: 3px;
  color: var(--text-secondary);
}

/* Dashboard Styles */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

@media (min-width: 900px) {
  .dashboard-grid {
    grid-template-columns: 2fr 1fr;
  }
}

.dashboard-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 8px;
}

.dashboard-subtitle {
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 30px;
}

@media (min-width: 600px) {
  .stats-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  padding: 20px;
  text-align: center;
}

.stat-val {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: white;
  margin-bottom: 4px;
}

.stat-lbl {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Operation Select Cards */
.section-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--primary);
  border-radius: 2px;
}

.operation-selector-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

@media (min-width: 600px) {
  .operation-selector-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.operation-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  height: 220px;
  cursor: pointer;
}

.operation-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: var(--transition);
  z-index: 1;
}

.operation-card:hover {
  transform: translateY(-5px);
}

.operation-card.addition:hover {
  box-shadow: 0 10px 30px var(--addition-glow);
  border-color: var(--addition);
}
.operation-card.subtraction:hover {
  box-shadow: 0 10px 30px var(--subtraction-glow);
  border-color: var(--subtraction);
}
.operation-card.multiplication:hover {
  box-shadow: 0 10px 30px var(--multiplication-glow);
  border-color: var(--multiplication);
}
.operation-card.division:hover {
  box-shadow: 0 10px 30px var(--division-glow);
  border-color: var(--division);
}

.op-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.op-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
}

.op-symbol {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
}

.op-symbol.addition { color: var(--addition); }
.op-symbol.subtraction { color: var(--subtraction); }
.op-symbol.multiplication { color: var(--multiplication); }
.op-symbol.division { color: var(--division); }

.op-description {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 8px;
  max-width: 80%;
}

.op-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.op-level-indicator {
  font-size: 13px;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 10px;
  border-radius: 50px;
  border: 1px solid var(--border-color);
}

.btn-start-op {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: white;
  display: flex;
  align-items: center;
  gap: 8px;
}

.addition .btn-start-op { background: var(--addition); }
.subtraction .btn-start-op { background: var(--subtraction); }
.multiplication .btn-start-op { background: var(--multiplication); }
.division .btn-start-op { background: var(--division); }

/* Difficulty Selector Dialog/Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

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

.modal-content {
  width: 90%;
  max-width: 600px;
  padding: 30px;
  position: relative;
  transform: scale(0.9);
  transition: var(--transition);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 24px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--subtraction);
}

.modal-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  text-align: center;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: 30px;
}

@media (max-width: 480px) {
  .level-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.level-btn {
  height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  font-weight: 600;
  transition: var(--transition);
}

.level-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.level-btn .lvl-num {
  font-size: 18px;
  font-family: var(--font-display);
}

.level-btn .lvl-time {
  font-size: 9px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.level-btn:hover .lvl-time {
  color: rgba(255, 255, 255, 0.8);
}

/* History Column */
.history-card {
  padding: 24px;
  max-height: 600px;
  display: flex;
  flex-direction: column;
}

.history-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  padding-right: 5px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.history-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.hist-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hist-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
}

.hist-icon.addition { background: var(--addition-glow); color: var(--addition); }
.hist-icon.subtraction { background: var(--subtraction-glow); color: var(--subtraction); }
.hist-icon.multiplication { background: var(--multiplication-glow); color: var(--multiplication); }
.hist-icon.division { background: var(--division-glow); color: var(--division); }

.hist-info {
  display: flex;
  flex-direction: column;
}

.hist-op {
  font-weight: 600;
  font-size: 14px;
}

.hist-date {
  font-size: 11px;
  color: var(--text-muted);
}

.hist-right {
  text-align: right;
}

.hist-score {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.hist-score.perfect {
  color: var(--correct);
}

.hist-details {
  font-size: 11px;
  color: var(--text-secondary);
}

.empty-history {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 0;
  font-size: 14px;
}

/* Footer styling */
footer {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-muted);
  margin-top: auto;
}

/* Game Page arena styles */
.game-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 10px;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.game-meta-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.game-badge {
  font-size: 14px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  border: 1px solid var(--border-color);
}

.game-badge.addition { background: var(--addition-glow); color: var(--addition); border-color: rgba(6, 182, 212, 0.3); }
.game-badge.subtraction { background: var(--subtraction-glow); color: var(--subtraction); border-color: rgba(244, 63, 94, 0.3); }
.game-badge.multiplication { background: var(--multiplication-glow); color: var(--multiplication); border-color: rgba(245, 158, 11, 0.3); }
.game-badge.division { background: var(--division-glow); color: var(--division); border-color: rgba(168, 85, 247, 0.3); }

.game-progress-text {
  font-size: 15px;
  color: var(--text-secondary);
}

.exit-game-btn {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.exit-game-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: white;
}

/* Progress bar */
.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  margin-bottom: 30px;
  overflow: hidden;
}

.session-progress {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: var(--transition);
}

/* Timer Countdown Line Bar */
.timer-bar-container {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  margin-bottom: 40px;
  overflow: hidden;
  position: relative;
}

.timer-bar {
  height: 100%;
  width: 100%;
  background: var(--correct);
  border-radius: 4px;
  transition: width 0.05s linear, background-color 0.3s ease;
}

/* Question Area */
.question-card {
  padding: 60px 40px;
  text-align: center;
  margin-bottom: 30px;
  min-height: 480px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}

.question-text {
  font-family: var(--font-display);
  font-size: 80px;
  font-weight: 800;
  margin-bottom: 50px;
  letter-spacing: -0.02em;
  color: white;
  animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.alternatives-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  width: 100%;
  max-width: 600px;
}

@media (min-width: 500px) {
  .alternatives-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.alt-btn {
  padding: 24px;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.alt-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

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

/* Interactive feedback classes when clicked */
.alt-btn.selected-correct {
  background-color: var(--correct) !important;
  border-color: var(--correct) !important;
  color: white !important;
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.6) !important;
  transform: scale(1.05);
}

.alt-btn.selected-incorrect {
  background-color: var(--incorrect) !important;
  border-color: var(--incorrect) !important;
  color: white !important;
  box-shadow: 0 0 25px rgba(239, 68, 68, 0.6) !important;
  animation: shake 0.35s ease-in-out;
}

.alt-btn.reveal-correct {
  background-color: var(--correct) !important;
  border-color: var(--correct) !important;
  color: white !important;
  opacity: 0.9;
}

.alt-btn.disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* Results panel */
.results-card {
  padding: 50px 40px;
  text-align: center;
}

.results-emoji {
  font-size: 72px;
  margin-bottom: 20px;
  animation: bounce 1s infinite alternate;
}

.results-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 10px;
}

.results-subtitle {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  max-width: 500px;
  margin: 0 auto 40px auto;
}

.res-stat {
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.res-val {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
}

.res-val.correct { color: var(--correct); }
.res-val.incorrect { color: var(--incorrect); }

.res-lbl {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-top: 4px;
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn-secondary {
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-weight: 600;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Animations */
@keyframes popIn {
  0% { transform: scale(0.8); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

@keyframes bounce {
  0% { transform: translateY(0); }
  100% { transform: translateY(-10px); }
}