:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #10b981;
  --success-hover: #0ea472;
  --warning: #f59e0b;
  --warning-hover: #d97706;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --surface-muted: #f3f4f6;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.10);
  --transition: all 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  min-height: 100vh;
  color: var(--text);
  line-height: 1.6;
}

/* --- Common buttons --- */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.action-btn {
  background: var(--success);
  color: var(--white, #fff);
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 auto;
  min-height: 50px;
  box-shadow: var(--shadow);
}

.action-btn:hover:not(:disabled) {
  background: var(--success-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.action-btn:active:not(:disabled) {
  transform: translateY(0);
}

.action-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* === LOGIN / REGISTER PAGE === */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-container {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  border: 1px solid var(--border);
  overflow: hidden;
  width: 100%;
  max-width: 400px;
  animation: fadeInUp 0.4s ease-out;
}

.login-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  color: var(--text);
  padding: 2rem;
  text-align: center;
}

.logo-large i {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.logo-large h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.logo-large p {
  color: var(--text-muted);
  font-size: 1rem;
}

.auth-container {
  padding: 2rem;
}

.auth-tabs {
  display: flex;
  margin-bottom: 1.5rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-muted);
}

.tab-btn {
  flex: 1;
  padding: 0.75rem;
  border: none;
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  font-family: inherit;
  color: var(--text-muted);
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
  animation: fadeIn 0.2s ease-in;
}

.auth-form h2 {
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--text);
}

.input-group {
  position: relative;
  margin-bottom: 1rem;
}

.input-group i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  z-index: 2;
}

.input-group input {
  width: 100%;
  padding: 12px 12px 12px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-hover);
}

.info-text {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.login-footer {
  background: var(--surface-muted);
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* === DASHBOARD === */
.dashboard-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.dashboard-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.logo i {
  color: var(--primary);
  font-size: 1.5rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.header-nav a:hover {
  color: var(--primary);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.welcome-text {
  font-weight: 600;
  color: var(--text);
}

.logout-btn {
  background: var(--danger);
  color: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

.logout-btn:hover {
  background: var(--danger-hover);
}

.dashboard-main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  width: 100%;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  color: var(--text);
  padding: 1.25rem 1.5rem;
}

.card-header h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
}

.card-header h2 i {
  color: var(--primary);
}

.card-content {
  padding: 1.5rem;
}

/* Level card */
.level-info {
  text-align: center;
  margin-bottom: 1.5rem;
}

.level-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--success);
  color: #fff;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
}

.level-meta {
  margin-top: 1rem;
  text-align: left;
  padding: 1rem;
  background: var(--surface-muted);
  border-radius: var(--radius);
}

.level-meta strong {
  display: block;
  margin-bottom: 0.5rem;
}

.level-meta p {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.difficulty-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.difficulty-badge.difficulty-facile { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.difficulty-badge.difficulty-intermédiaire { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.difficulty-badge.difficulty-avancé { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

.elapsed-time {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.container-status {
  text-align: center;
}

.loading-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.loading-indicator.error {
  color: var(--danger);
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top: 2px solid var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Hints card */
.hints-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hint-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.hint-reveal-btn {
  width: 100%;
  padding: 12px 14px;
  background: var(--surface-muted);
  border: none;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.hint-reveal-btn:hover {
  background: var(--border);
}

.hint-text {
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--text);
  display: none;
  border-top: 1px solid var(--border);
}

.hint-item.revealed .hint-text {
  display: block;
}

.hints-empty {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

/* Flag form */
.flag-form .input-group {
  display: flex;
  gap: 10px;
}

.flag-form input {
  flex: 1;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.flag-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.submit-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.submit-btn:hover:not(:disabled) {
  background: var(--primary-hover);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result-message {
  margin-top: 1rem;
  padding: 12px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  font-size: 0.9rem;
}

.result-message.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.result-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

/* Actions */
.reset-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--warning);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
  width: 100%;
  min-height: 50px;
  box-shadow: var(--shadow);
}

.reset-btn:hover {
  background: var(--warning-hover);
  box-shadow: var(--shadow-hover);
}

.dashboard-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  text-align: center;
  padding: 1rem;
  margin-top: auto;
  font-size: 0.9rem;
}

/* === LEADERBOARD === */
.leaderboard-main {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

.leaderboard-table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.leaderboard-table th {
  background: var(--surface-muted);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
}

.leaderboard-table tbody tr:hover {
  background: var(--surface-muted);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.85rem;
}

.rank-badge.top1 { background: #fde68a; color: #92400e; }
.rank-badge.top2 { background: #e5e7eb; color: #374151; }
.rank-badge.top3 { background: #fed7aa; color: #9a3412; }

/* Error container */
.error-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  color: var(--text);
  padding: 2rem;
}

.error-container i {
  font-size: 3rem;
  color: var(--danger);
  margin-bottom: 1rem;
}

.error-container h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.error-container p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
  .dashboard-main {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .header-content {
    padding: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .logo span {
    display: none;
  }

  .flag-form .input-group {
    flex-direction: column;
  }

  .submit-btn {
    width: 100%;
    justify-content: center;
  }

  .action-btn,
  .reset-btn {
    padding: 12px 16px;
    font-size: 0.95rem;
    min-height: 45px;
  }
}

@media (max-width: 480px) {
  .action-btn,
  .reset-btn {
    padding: 10px 14px;
    font-size: 0.9rem;
    min-height: 40px;
  }

  .action-btn span {
    display: none;
  }

  .action-btn i {
    font-size: 1.1rem;
  }
}