/* ============================================================
   Concentration Training Space - Styles
   Modern blue/indigo dark theme with glassmorphism
   ============================================================ */

/* CSS Variables */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: rgba(30, 58, 95, 0.7);
  --bg-card-solid: #1e3a5f;
  --bg-card-light: #e0f2fe;
  --bg-input: #f0f9ff;
  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;
  --accent-red: #ef4444;
  --accent-purple: #a78bfa;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --border-radius: 16px;
  --border-radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.08);
  --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #0c1a3a 40%, #162044 70%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }

/* ============================================================
   Layout
   ============================================================ */

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  text-align: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 1.5rem;
}

.app-header h1 {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue), var(--accent-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 2.2rem;
}

.app-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.3rem;
}

/* Main content layout */
.main-content {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 1.5rem;
  flex: 1;
}

.exercise-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mentor-panel {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

/* ============================================================
   Cards — Glassmorphism
   ============================================================ */

.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--glass-border);
}

.card-light {
  background: var(--bg-card-light);
  color: var(--text-dark);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ============================================================
   Home Screen
   ============================================================ */

.home-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
  text-align: center;
  gap: 2rem;
}

.home-screen h1 {
  font-size: 2.8rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-question {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.home-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
  max-width: 520px;
}

.home-btn {
  padding: 1rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.home-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.btn-identify {
  background: linear-gradient(135deg, var(--accent-amber), #d97706);
  color: var(--text-dark);
  grid-column: 1 / -1;
}

.btn-molarity {
  background: linear-gradient(135deg, var(--accent-blue), #2563eb);
  color: white;
}

.btn-molality {
  background: linear-gradient(135deg, var(--accent-indigo), #4f46e5);
  color: white;
}

.btn-mass-percent {
  background: linear-gradient(135deg, var(--accent-emerald), #059669);
  color: white;
}

.btn-dilution {
  background: linear-gradient(135deg, var(--accent-cyan), #0891b2);
  color: var(--text-dark);
}

.btn-density {
  background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
  color: white;
  grid-column: 1 / -1;
}

/* ============================================================
   Problem Display
   ============================================================ */

.problem-display {
  background: var(--bg-card-light);
  color: var(--text-dark);
  padding: 1.2rem 1.5rem;
  border-radius: var(--border-radius);
  font-size: 1.05rem;
  text-align: center;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--accent-blue);
}

/* ============================================================
   Progress Bar
   ============================================================ */

.progress-bar-container {
  background: var(--glass);
  border-radius: 20px;
  padding: 0.3rem;
  margin-bottom: 1rem;
  border: 1px solid var(--glass-border);
}

.progress-steps {
  display: flex;
  gap: 0.25rem;
}

.progress-step {
  flex: 1;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  transition: var(--transition);
}

.progress-step.active {
  background: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.4);
}

.progress-step.completed {
  background: var(--accent-emerald);
}

.progress-label {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* ============================================================
   Step Content — Calculation Inputs
   ============================================================ */

.step-instruction {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
  color: white;
  padding: 0.8rem 1.2rem;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-instruction.warning {
  background: linear-gradient(135deg, var(--accent-amber), #d97706);
  color: var(--text-dark);
}

.given-data {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.given-data-item {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  padding: 0.8rem 1.2rem;
  text-align: center;
  backdrop-filter: blur(8px);
}

.given-data-item .label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.given-data-item .value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-top: 0.2rem;
}

.answer-input-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.answer-input {
  width: 140px;
  height: 50px;
  text-align: center;
  border: 2px solid var(--accent-blue);
  border-radius: var(--border-radius-sm);
  background: rgba(255, 255, 255, 0.08);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

.answer-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
  background: rgba(255, 255, 255, 0.12);
}

.answer-input.correct {
  border-color: var(--success-color);
  background: rgba(16, 185, 129, 0.15);
}

.answer-input.incorrect {
  border-color: var(--error-color);
  background: rgba(239, 68, 68, 0.1);
  animation: shake 0.5s ease-in-out;
}

.answer-unit {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* Revealed step info */
.revealed-step {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--border-radius-sm);
  padding: 0.6rem 1rem;
  margin: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--accent-emerald);
}

/* ============================================================
   Identify Activity — Choice Buttons
   ============================================================ */

.identify-options {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.identify-btn {
  padding: 0.8rem 1.5rem;
  border: 2px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  background: var(--glass);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.identify-btn:hover {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  transform: translateX(4px);
}

.identify-btn.selected {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.15);
}

/* Dilution radio choices */
.radio-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.radio-option {
  padding: 0.7rem 1.5rem;
  border: 2px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  background: var(--glass);
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.radio-option:hover {
  border-color: var(--accent-cyan);
}

.radio-option.selected {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.2);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.3);
}

/* ============================================================
   Difficulty Selector
   ============================================================ */

.difficulty-selector {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  margin: 1rem 0;
}

.difficulty-chip {
  padding: 0.6rem 1.5rem;
  border-radius: 20px;
  border: 2px solid var(--glass-border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}

.difficulty-chip:hover,
.difficulty-chip.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
}

.difficulty-chip.basic.active { border-color: var(--accent-emerald); color: var(--accent-emerald); }
.difficulty-chip.intermediate.active { border-color: var(--accent-amber); color: var(--accent-amber); }
.difficulty-chip.advanced.active { border-color: var(--accent-red); color: var(--accent-red); }

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
  color: white;
}

.btn-secondary {
  background: var(--glass);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
}

.btn-hint {
  background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
  color: white;
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-emerald), #059669);
  color: white;
}

.btn-danger {
  background: var(--error-color);
  color: white;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-group {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  margin-top: 1rem;
}

/* ============================================================
   Chat / Mentor Panel
   ============================================================ */

.mentor-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--glass-border);
  overflow: hidden;
}

.mentor-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 1.2rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--glass-border);
}

.mentor-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.mentor-info h3 {
  font-size: 0.95rem;
}

.mentor-info .status {
  font-size: 0.75rem;
  color: var(--accent-emerald);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  min-height: 300px;
  max-height: 500px;
}

.chat-message {
  max-width: 85%;
  padding: 0.7rem 1rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
  animation: fadeIn 0.3s ease;
}

.chat-message.mentor {
  background: rgba(255, 255, 255, 0.06);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat-message.student {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-message.system {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-purple);
  align-self: center;
  text-align: center;
  font-size: 0.85rem;
  max-width: 100%;
}

.chat-message.hint {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: var(--accent-amber);
  align-self: flex-start;
  font-size: 0.85rem;
}

.chat-input-area {
  padding: 0.8rem;
  border-top: 1px solid var(--glass-border);
  display: flex;
  gap: 0.5rem;
}

.chat-input {
  flex: 1;
  padding: 0.6rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.chat-input:focus {
  border-color: var(--accent-cyan);
  background: rgba(255, 255, 255, 0.08);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-send-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
  color: white;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.chat-send-btn:hover {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
}

.chat-send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 0.5rem 1rem;
  align-self: flex-start;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

/* ============================================================
   Feedback Messages
   ============================================================ */

.feedback {
  padding: 0.8rem 1.2rem;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: fadeIn 0.3s ease;
}

.feedback.success {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success-color);
}

.feedback.error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error-color);
}

.feedback.info {
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--accent-blue);
}

/* ============================================================
   Final Result / Completion
   ============================================================ */

.final-result {
  text-align: center;
  padding: 2rem;
  animation: fadeIn 0.5s ease;
}

.final-result h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.final-answer-display {
  background: var(--bg-card-light);
  color: var(--text-dark);
  padding: 1.5rem 2rem;
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.5rem auto;
  max-width: 400px;
  box-shadow: var(--shadow);
  border: 3px solid var(--accent-emerald);
}

/* ============================================================
   Formula Reference Panel
   ============================================================ */

.formulas-panel {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  padding: 1.2rem;
  margin-top: 1rem;
  border: 1px solid rgba(245, 158, 11, 0.25);
  font-size: 0.85rem;
  line-height: 1.8;
  display: none;
}

.formulas-panel.visible {
  display: block;
  animation: slideDown 0.3s ease;
}

.formulas-panel h4 {
  color: var(--accent-amber);
  margin-bottom: 0.5rem;
}

.formulas-panel ul {
  list-style: none;
  padding-left: 0;
}

.formulas-panel li {
  padding: 0.3rem 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--glass-border);
}

.formulas-panel li:last-child {
  border-bottom: none;
}

/* ============================================================
   Animations
   ============================================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@keyframes typing {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-4px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-success {
  animation: pulse 0.5s ease;
}

/* ============================================================
   Scrollbar
   ============================================================ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ============================================================
   Responsive
   ============================================================ */

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

  .mentor-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 60vh;
    z-index: 100;
    transform: translateY(calc(100% - 50px));
    transition: transform 0.3s ease;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
  }

  .mentor-panel.expanded {
    transform: translateY(0);
  }

  .mentor-panel .mentor-header {
    cursor: pointer;
  }

  .exercise-panel {
    padding-bottom: 60px;
  }

  .home-options {
    grid-template-columns: 1fr;
  }

  .home-screen h1 {
    font-size: 2rem;
  }
}

@media (max-width: 600px) {
  .given-data {
    flex-direction: column;
    align-items: center;
  }

  .btn-group {
    flex-direction: column;
  }

  .radio-group {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================================
   Hidden utility
   ============================================================ */

.hidden {
  display: none !important;
}

/* ============================================================
   Login Page
   ============================================================ */

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.login-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  padding: 2.5rem;
  max-width: 480px;
  width: 100%;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 2px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus {
  border-color: var(--accent-cyan);
  background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.login-submit {
  width: 100%;
  margin-top: 1rem;
}

/* Resume card */
.resume-card {
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--border-radius-sm);
  padding: 1.2rem;
  margin: 1rem 0;
  animation: fadeIn 0.3s ease;
}

.resume-card h3 {
  font-size: 1rem;
  margin-bottom: 0.8rem;
  color: var(--accent-cyan);
}

.resume-stats {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.resume-stat {
  text-align: center;
}

.resume-stat-value {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.resume-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.resume-actions {
  display: flex;
  gap: 0.8rem;
}

.resume-actions .btn {
  flex: 1;
}

/* ============================================================
   Student Header Bar
   ============================================================ */

.student-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  margin-top: 0.5rem;
  border-top: 1px solid var(--glass-border);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.btn-sm {
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
}

/* ============================================================
   Admin Dashboard
   ============================================================ */

.admin-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  min-height: 100vh;
}

.admin-header {
  text-align: center;
  padding: 1rem 0;
  margin-bottom: 1.5rem;
}

.admin-header h1 {
  font-size: 1.8rem;
  color: var(--text-primary);
}

.admin-summary {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.summary-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 1.2rem 1.5rem;
  text-align: center;
  min-width: 140px;
}

.summary-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.summary-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 0.2rem;
}

.admin-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.admin-table-wrap {
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.admin-table th,
.admin-table td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--glass-border);
  text-align: center;
}

.admin-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.5px;
}

.admin-table td {
  color: var(--text-primary);
}

.admin-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

.session-detail {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin-top: 1rem;
}

.session-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.session-detail pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--border-radius-sm);
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  max-height: 400px;
  overflow-y: auto;
}