/* ============ CSS VARIABLES ============ */
:root {
  /* Colors */
  --color-bg-primary: #0b1120;
  --color-bg-secondary: #1a2332;
  --color-text-primary: #e5e7eb;
  --color-text-secondary: #9ca3af;
  --color-accent: #38bdf8;
  --color-accent-hover: #0ea5e9;
  --color-error: #ef4444;
  --color-success: #10b981;
  --color-border: #374151;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  --font-mono: "Monaco", "Courier New", monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  
  /* Transitions */
  --transition: all 0.2s ease;
}

/* Light mode */
[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f3f4f6;
  --color-text-primary: #111827;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
}

/* ============ GLOBAL STYLES ============ */

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

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

body {
  font-family: var(--font-sans);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, #1f2937 100%);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow: hidden;
}

#root {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Styling for the Book Recommendation Cards */
.book-card {
    background: #fdf6e3; /* Light parchment color */
    border-left: 5px solid var(--color-accent);
    border-radius: 8px;
    padding: var(--space-md);
    margin: var(--space-sm) 0;
    color: #2c3e50; /* Darker text for readability on light bg */
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

.book-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.book-title {
    font-family: 'Georgia', serif;
    font-size: var(--font-size-lg);
    font-weight: bold;
    display: block;
    color: #1a2a3a;
}

.book-author {
    font-style: italic;
    font-size: var(--font-size-sm);
    color: #7f8c8d;
    margin-bottom: var(--space-sm);
    display: block;
}

.book-hook {
    font-size: var(--font-size-base);
    line-height: 1.4;
}

/* ============ HEADER ============ */

.header {
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-section h1 {
  font-size: var(--font-size-lg);
  margin: 0;
  color: var(--color-accent);
}

.subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transition: var(--transition);
}

.status-dot.connected {
  background: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
}

.status-dot.loading {
  background: var(--color-accent);
  animation: pulse 1.5s ease-in-out infinite;
}

.status-dot.error {
  background: var(--color-error);
  box-shadow: 0 0 8px var(--color-error);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.status-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ============ MAIN CONTAINER ============ */

.main-container {
  display: flex;
  flex: 1;
  gap: var(--space-md);
  padding: var(--space-md);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  overflow: hidden;
}

/* ============ SETTINGS PANEL ============ */

.settings-panel {
  width: 250px;
  background: rgba(26, 35, 50, 0.8);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-lg);
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
}

.settings-panel h2 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

.control-group {
  margin-bottom: var(--space-lg);
}

.control-group label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.control-group select,
.control-group input[type="range"],
.control-group input[type="number"] {
  width: 100%;
  padding: var(--space-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.control-group select:focus,
.control-group input[type="number"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.control-group input[type="range"] {
  padding: 0;
  cursor: pointer;
}

.control-group small {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.model-info {
  display: block !important;
  margin-top: var(--space-sm);
  padding: var(--space-sm);
  background: rgba(56, 189, 248, 0.1);
  border-left: 2px solid var(--color-accent);
  border-radius: 4px;
  font-size: var(--font-size-xs);
  color: var(--color-accent);
}

.param-value {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  font-weight: 600;
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
}

.btn-secondary {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--color-border);
}

/* ============ CHAT SECTION ============ */

.chat-section {
  display: flex;
  flex-direction: column;
  flex: 1;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Messages */
.message {
  display: flex;
  animation: slideIn 0.3s ease;
  max-width: 85%;
}

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

.message.user {
  align-self: flex-end;
  justify-content: flex-end;
}

.message-content {
  padding: var(--space-md);
  border-radius: 12px;
  line-height: 1.6;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message.user .message-content {
  background: var(--color-accent);
  color: var(--color-bg-primary);
  border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--color-border);
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-md);
}

.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-secondary);
  animation: bounce 1.4s infinite;
}

.typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.5; }
  40% { transform: translateY(-8px); opacity: 1; }
}

/* ============ INPUT AREA ============ */

.input-wrapper {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: rgba(11, 17, 32, 0.9);
}

.input-container {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.user-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  resize: vertical;
  min-height: 60px;
  max-height: 200px;
  transition: var(--transition);
}

.user-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.user-input::placeholder {
  color: var(--color-text-secondary);
}

.input-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.char-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.btn-primary {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent);
  color: var(--color-bg-primary);
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

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

.btn-icon {
  font-size: 1.2em;
}

.status-message {
  min-height: 24px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--space-sm);
  border-radius: 6px;
  display: none;
}

.status-message.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border-left: 3px solid var(--color-error);
  color: var(--color-error);
  padding: var(--space-md);
}

.status-message.warning {
  display: block;
  background: rgba(251, 146, 60, 0.1);
  border-left: 3px solid #f97316;
  color: #f97316;
  padding: var(--space-md);
}

/* ============ FOOTER ============ */

.footer {
  background: rgba(15, 23, 42, 0.95);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md);
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.footer-small {
  margin-top: var(--space-sm);
}

/* ============ RESPONSIVE DESIGN ============ */

@media (max-width: 1024px) {
  .main-container {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .settings-panel {
    width: 100%;
    max-height: 150px;
  }

  .message {
    max-width: 95%;
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-md);
  }

  .main-container {
    padding: var(--space-sm);
    gap: var(--space-sm);
  }

  .settings-panel {
    order: 2;
    max-height: 120px;
    padding: var(--space-md);
  }

  .chat-section {
    order: 1;
  }

  .message {
    max-width: 100%;
  }

  .user-input {
    min-height: 50px;
  }
}

/* ============ SCROLLBAR ============ */

.messages-container::-webkit-scrollbar,
.settings-panel::-webkit-scrollbar {
  width: 6px;
}

.messages-container::-webkit-scrollbar-track,
.settings-panel::-webkit-scrollbar-track {
  background: transparent;
}

.messages-container::-webkit-scrollbar-thumb,
.settings-panel::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.messages-container::-webkit-scrollbar-thumb:hover,
.settings-panel::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-secondary);
}