.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}
.auth-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(var(--accent-rgb), 0.02);
  border-bottom: 1px solid var(--border);
}
.auth-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem 3rem;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.25);
}
.auth-title {
  font-family: 'Fraunces', serif;
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}
.auth-subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 1.75rem;
  line-height: 1.5;
}
.auth-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.auth-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 0.5rem;
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.auth-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--glow);
}
.auth-input-code {
  letter-spacing: 0.35em;
  text-align: center;
  font-size: 1.25rem;
}
.auth-btn {
  width: 100%;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: none;
  border-radius: 0.5rem;
  background: var(--accent);
  color: #0c0b09;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}
.auth-btn:hover { opacity: 0.92; transform: translateY(-1px); }
.auth-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  margin-bottom: 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}
.oauth-btn:hover {
  border-color: var(--accent);
  background: var(--bg-elev-2);
}
.oauth-btn--yandex { border-color: rgba(252, 63, 29, 0.35); }
.oauth-btn--vk { border-color: rgba(0, 119, 255, 0.35); }
.oauth-btn--disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.auth-flash {
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  margin-bottom: 1rem;
  line-height: 1.4;
}
.auth-flash--success {
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.35);
  color: var(--accent-2);
}
.auth-flash--error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fca5a5;
}
.auth-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.45;
}
.auth-checkbox input { margin-top: 0.2rem; accent-color: var(--accent); }
.auth-checkbox a { color: var(--accent); text-decoration: none; }
.auth-checkbox a:hover { text-decoration: underline; }
.auth-consent-note {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0.75rem 0 0.25rem;
}
.auth-consent-note a { color: var(--accent); text-decoration: none; }
.auth-consent-note a:hover { text-decoration: underline; }
.auth-consent-note .fa-circle-check { color: var(--accent-2); margin-right: 0.35rem; }
.is-consent-locked {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(0.4);
}
.auth-shake { animation: auth-shake 0.4s ease; }
@keyframes auth-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}
.auth-switch {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.auth-switch a { color: var(--accent); text-decoration: none; }
.auth-switch a:hover { text-decoration: underline; }
.auth-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.75rem;
  line-height: 1.4;
}
.auth-link-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
}
.vk-id-container {
  min-height: 44px;
  margin-bottom: 0.75rem;
}
.vk-id-container iframe {
  max-width: 100%;
}
.legal-page { padding: 6rem 1.5rem 4rem; max-width: 48rem; margin: 0 auto; }
.legal-page h1 {
  font-family: 'Fraunces', serif;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 0.5rem;
}
.legal-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}
.legal-page h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
  color: var(--fg);
}
.legal-page p, .legal-page li {
  color: var(--fg-dim);
  line-height: 1.7;
  font-size: 0.95rem;
}
.legal-page ul { padding-left: 1.25rem; }
.legal-page a { color: var(--accent); }
.app-shell { min-height: 100vh; background: var(--bg); }
.app-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(12px);
}
.app-main { max-width: 56rem; margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.app-welcome {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
}
.app-avatar {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-strong);
}
.app-placeholder {
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px dashed var(--border-strong);
  border-radius: 0.75rem;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
}

/* === Trainer App Layout === */
.app-layout {
  display: flex;
  min-height: calc(100vh - 65px);
}
.app-sidebar {
  width: 220px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 1.5rem 1rem;
  background: var(--bg-elev);
}
.app-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.app-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: 100%;
  text-decoration: none;
}
.app-nav-item:hover {
  background: var(--bg-elev-2);
  color: var(--fg);
}
.app-nav-item.active {
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
}
.app-nav-item i {
  font-size: 14px;
  width: 18px;
  text-align: center;
}
.app-content {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}
.app-page {
  display: none;
}
.app-page.active {
  display: block;
}

/* Dashboard */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px -8px var(--glow);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.stat-card:hover::before {
  transform: scaleX(1);
}
.stat-card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.stat-card-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
.stat-card-value {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--accent);
}
.stat-card-bar {
  margin-top: 0.75rem;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.stat-card-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  transition: width 0.5s ease;
}

/* Practice */
.question-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 1.5rem;
}
.question-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.question-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-strong);
  color: var(--muted);
}
.question-badge.category {
  color: var(--accent);
  border-color: rgba(var(--accent-rgb), 0.4);
}
.question-badge.difficulty {
  color: var(--accent-2);
  border-color: rgba(var(--accent-2-rgb), 0.4);
}
.question-badge.answered {
  color: #28c840;
  border-color: rgba(40, 200, 64, 0.4);
}
.question-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--fg);
  margin-bottom: 1.5rem;
}
.question-explanation {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-top: 1.25rem;
  line-height: 1.7;
  color: var(--fg-dim);
  font-size: 0.95rem;
  display: none;
}
.question-explanation.visible {
  display: block;
}
.question-explanation-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.question-actions {
  display: flex;
  gap: 10px;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}
.question-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.question-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
}
.question-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
}

/* Buttons (extended) */
.btn-accent {
  background: var(--accent);
  color: var(--bg);
  padding: 10px 18px;
  border: none;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-accent:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.btn-accent:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--fg-dim);
  padding: 10px 18px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Filter pills */
.filter-pills {
  display: flex;
  gap: 6px;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.filter-pill {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.filter-pill:hover {
  border-color: var(--accent);
  color: var(--fg);
}
.filter-pill.active {
  background: rgba(var(--accent-rgb), 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
  .app-layout {
    flex-direction: column;
  }
  .app-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem;
  }
  .app-sidebar-nav {
    flex-direction: row;
    overflow-x: auto;
    gap: 4px;
  }
  .app-nav-item {
    white-space: nowrap;
    font-size: 0.7rem;
    padding: 8px 12px;
  }
  .app-content {
    padding: 1.25rem 1rem;
  }
  .dashboard-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  .question-card {
    padding: 1.25rem;
  }
}