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

html {
  font-size: 136%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  min-height: 100vh;
  color: #e0e0e0;
  line-height: 1.6;
}

header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 1rem 2rem;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-logo {
  height: 130px;
  width: auto;
}

.header-text {
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

header p {
  color: #a0a0a0;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hidden {
  display: none !important;
}

h2 {
  color: #fff;
  margin-bottom: 0.5rem;
  font-size: 34px;
}

.subtitle {
  color: #888;
  margin-bottom: 1.5rem;
}

/* Auth Styles */
.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.2);
}

.auth-tab {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: #888;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.auth-tab.active {
  background: rgba(74, 158, 255, 0.2);
  color: #fff;
}

.auth-tab:hover:not(.active) {
  background: rgba(255, 255, 255, 0.05);
}

.auth-form {
  margin-bottom: 1rem;
}

.auth-divider {
  display: flex;
  align-items: center;
  margin: 1.5rem 0;
  color: #666;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.auth-divider span {
  padding: 0 1rem;
  font-size: 0.9rem;
}

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: #fff;
  color: #333;
  font-weight: 500;
}

.btn-google:hover {
  background: #f5f5f5;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-google svg {
  flex-shrink: 0;
}

.btn-full {
  width: 100%;
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.auth-error {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

.auth-error.error {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.auth-error.success {
  background: rgba(74, 222, 128, 0.2);
  border: 1px solid rgba(74, 222, 128, 0.3);
  color: #4ade80;
}

/* User Bar */
.user-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.user-info span {
  color: #ccc;
}

.credits-badge {
  background: rgba(74, 222, 128, 0.2);
  padding: 0.375rem 0.875rem;
  border-radius: 20px;
  color: #4ade80 !important;
  font-size: 0.9rem;
}

.credits-badge strong {
  font-weight: 700;
}

/* Logout button icon/text toggle */
.logout-icon {
  display: none;
}

.logout-text {
  display: inline;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: #ccc;
  font-weight: 500;
}

.form-group.disclaimer label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: #999;
  cursor: pointer;
}

.form-group.disclaimer input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  cursor: pointer;
}

/* Tooltip for disabled button */
.tooltip-wrapper {
  position: relative;
  display: inline-block;
}

.tooltip-wrapper .tooltip-text {
  visibility: hidden;
  opacity: 0;
  background: #333;
  color: #fff;
  text-align: center;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 0.5rem;
  white-space: nowrap;
  font-size: 0.9rem;
  transition: opacity 0.2s;
  z-index: 10;
}

.tooltip-wrapper .tooltip-text::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #333;
}

.tooltip-wrapper.show-tooltip .tooltip-text {
  visibility: visible;
  opacity: 1;
}

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

.btn:disabled:hover {
  transform: none;
  box-shadow: none;
}

input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  padding: 0.875rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: #fff;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
  outline: none;
  border-color: #4a9eff;
  box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* Button Styles */
.btn {
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary {
  background: linear-gradient(135deg, #4a9eff 0%, #2d7ed9 100%);
  color: #fff;
}

.btn-primary:hover {
  box-shadow: 0 4px 15px rgba(74, 158, 255, 0.4);
}

.btn-success {
  background: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
  color: #000;
  margin-top: 1rem;
  width: 100%;
}

.btn-success:hover {
  box-shadow: 0 4px 15px rgba(74, 222, 128, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Button Loading State */
.btn.loading {
  opacity: 0.7;
  cursor: wait;
  pointer-events: none;
  position: relative;
}

.btn.loading::after {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  margin-right: 8px;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
}

/* Chat Styles */
#chat-messages {
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 1rem;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
}

.chat-message {
  padding: 1rem;
  border-radius: 12px;
  margin-bottom: 1rem;
  max-width: 85%;
}

.chat-message.assistant {
  background: rgba(74, 158, 255, 0.2);
  border: 1px solid rgba(74, 158, 255, 0.3);
  margin-left: auto;
  margin-right: 0;
}

.chat-message.user {
  background: rgba(74, 222, 128, 0.2);
  border: 1px solid rgba(74, 222, 128, 0.3);
  margin-right: auto;
  margin-left: 0;
}

.chat-input {
  display: flex;
  gap: 0.5rem;
}

.chat-input input {
  flex: 1;
}

.chat-input .btn {
  padding: 0.875rem 1.25rem;
}

/* Loading Styles */
#loading {
  text-align: center;
  padding: 3rem;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top-color: #4a9eff;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Presentations Grid */
#presentations {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.presentation {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.presentation:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.presentation.recommended {
  border-color: #4ade80;
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.2);
}

.pres-header {
  padding: 1rem 1.5rem;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pres-header h3 {
  color: #fff;
  font-size: 1.1rem;
}

.era-tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  color: #a0a0a0;
}

.era-tag.recommended-tag {
  background: rgba(74, 222, 128, 0.2);
  color: #4ade80;
  font-weight: 600;
}

.presentation .content {
  padding: 1.5rem;
  color: #d0d0d0;
  font-size: 0.95rem;
  white-space: pre-wrap;
}

#results h2 {
  text-align: center;
}

#results .subtitle {
  text-align: center;
  margin-bottom: 2rem;
}

#start-over {
  display: block;
  margin: 0 auto;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  font-size: 28px;
}
footer a {color: #4a9eff;}

/* Responsive */
@media (max-width: 768px) {
  main {
    padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  header {
    gap: 1rem;
    padding: 0.75rem 1rem;
  }

  .header-logo {
    height: 80px;
  }

  header h1 {
    font-size: 2rem;
  }

  #presentations {
    grid-template-columns: 1fr;
  }

  /* User bar mobile */
  .user-bar {
    padding: 0.75rem 1rem;
    gap: 0.5rem;
  }

  .user-info {
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
  }

  .user-info > span:first-child {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 80px;
  }

  .credits-badge {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
  }

  /* Show icon, hide text on mobile */
  .logout-icon {
    display: inline;
  }

  .logout-text {
    display: none;
  }

  #logout-btn {
    padding: 0.5rem;
    min-width: auto;
  }
}