/* ==========================================================================
   GEMINI AI UI - STYLESHEET (Dark & Light Themes + Glassmorphism)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Gemini Dark Mode (Default) */
  --bg-main: #131314;
  --bg-sidebar: #1e1f20;
  --bg-card: #1e1f20;
  --bg-card-hover: #282a2c;
  --bg-input: #1e1f20;
  --bg-modal: #1e1f20;
  --bg-user-msg: #282a2c;
  --border-color: #37393b;
  --border-focus: #4a4d51;
  
  --text-primary: #e3e3e3;
  --text-secondary: #c4c7c5;
  --text-muted: #8e918f;
  
  --accent-blue: #4285f4;
  --accent-purple: #9b51e0;
  --accent-pink: #e91e63;
  --accent-gradient: linear-gradient(135deg, #4285f4 0%, #9b51e0 50%, #e91e63 100%);
  --accent-gradient-hover: linear-gradient(135deg, #5393ff 0%, #aa62ee 50%, #f73376 100%);
  
  --sidebar-width: 280px;
  --header-height: 60px;
  --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-code: 'Fira Code', monospace;
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(66, 133, 244, 0.25);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-main: #ffffff;
  --bg-sidebar: #f0f4f9;
  --bg-card: #f0f4f9;
  --bg-card-hover: #e1e9f5;
  --bg-input: #f0f4f9;
  --bg-modal: #ffffff;
  --bg-user-msg: #e9eef6;
  --border-color: #e1e3e1;
  --border-focus: #c4c7c5;
  
  --text-primary: #1f1f1f;
  --text-secondary: #444746;
  --text-muted: #747775;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(66, 133, 244, 0.15);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* App Container */
#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}

/* ==========================================================================
   SIDEBAR COMPONENT
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  height: 100%;
  border-right: 1px solid var(--border-color);
  transition: transform var(--transition-normal), width var(--transition-normal);
  z-index: 100;
  flex-shrink: 0;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  position: absolute;
}

.sidebar-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.new-chat-btn {
  margin: 12px 16px 20px 16px;
  padding: 12px 20px;
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.new-chat-btn:hover {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

.new-chat-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px;
}

.nav-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  padding: 12px 12px 8px 12px;
}

.chat-history-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.chat-item:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.chat-item.active {
  background-color: var(--bg-card-hover);
  color: var(--accent-blue);
  font-weight: 500;
}

.chat-item-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}

.chat-item-actions {
  display: none;
  align-items: center;
  gap: 4px;
}

.chat-item:hover .chat-item-actions {
  display: flex;
}

.chat-action-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 4px;
  border-radius: 50%;
  cursor: pointer;
}

.chat-action-btn:hover {
  color: #ff4d4d;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  width: 100%;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.footer-btn:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.footer-btn.context-active {
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple);
  background-color: rgba(155, 81, 224, 0.1);
}

.firebase-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 6px 12px;
}

.firebase-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #34a853; /* Green connected status */
  box-shadow: 0 0 8px #34a853;
}

/* ==========================================================================
   MAIN CONTENT AREA
   ========================================================================== */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-main);
}

/* Top Header Bar */
.top-header {
  height: var(--header-height);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sparkle-icon {
  width: 24px;
  height: 24px;
  animation: spinGlow 6s infinite linear;
}

@keyframes spinGlow {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.1); }
  100% { transform: rotate(360deg) scale(1); }
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 10px;
}

.model-badge {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.context-badge {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(155, 81, 224, 0.15);
  border: 1px solid var(--accent-purple);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-purple);
  display: none;
  align-items: center;
  gap: 6px;
}

.context-badge.show {
  display: flex;
}

/* Chat Feed & Empty State */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome-screen {
  max-width: 800px;
  width: 100%;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin: auto 0;
  animation: fadeIn 0.4s ease-out;
}

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

.greeting-headline {
  font-size: 3.2rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 8px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.greeting-subtext {
  font-size: 2.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  width: 100%;
}

.suggestion-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.suggestion-card:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.suggestion-card p {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.suggestion-icon {
  align-self: flex-end;
  background: var(--bg-main);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

/* Messages Feed */
.messages-feed {
  width: 100%;
  max-width: 800px;
  padding: 0 24px 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.message-wrapper {
  display: flex;
  gap: 16px;
  width: 100%;
  animation: messageSlideIn 0.3s ease-out;
}

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

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

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.message-wrapper.assistant .message-avatar {
  background: transparent;
}

.message-wrapper.user .message-avatar {
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.85rem;
}

.message-body {
  max-width: 88%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message-wrapper.user .message-body {
  background-color: var(--bg-user-msg);
  padding: 14px 20px;
  border-radius: var(--radius-lg);
  border-top-right-radius: 4px;
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.5;
}

.message-wrapper.assistant .message-body {
  color: var(--text-primary);
  font-size: 1.02rem;
  line-height: 1.6;
  width: 100%;
}

/* Formatting inside Assistant Messages */
.message-body p {
  margin-bottom: 12px;
}
.message-body p:last-child {
  margin-bottom: 0;
}

.message-body ul, .message-body ol {
  margin: 12px 0 12px 24px;
}

.message-body li {
  margin-bottom: 6px;
}

.message-body strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Code Blocks */
.code-block-wrapper {
  margin: 16px 0;
  background-color: #0d0e0f;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-header {
  background-color: #18191b;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-code);
  border-bottom: 1px solid var(--border-color);
}

.copy-code-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.copy-code-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.code-block-wrapper pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.9rem;
  line-height: 1.5;
  color: #e6edf3;
}

/* Inline Code */
code.inline-code {
  background-color: var(--bg-card-hover);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-code);
  font-size: 0.88em;
}

/* Message Actions Toolbar */
.message-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.action-icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.action-icon-btn:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

/* Thinking Indicator */
.thinking-loader {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 0;
}

.dot-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-gradient);
  animation: pulseDot 1.4s infinite ease-in-out both;
}

.dot-pulse:nth-child(1) { animation-delay: -0.32s; }
.dot-pulse:nth-child(2) { animation-delay: -0.16s; }

@keyframes pulseDot {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1.1); opacity: 1; }
}

/* ==========================================================================
   INPUT CONTAINER (BOTTOM FLOATING BAR)
   ========================================================================== */
.input-area-wrapper {
  width: 100%;
  max-width: 800px;
  padding: 0 24px 20px 24px;
  margin: 0 auto;
  position: relative;
  z-index: 20;
}

.input-box-container {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-box-container:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-glow);
}

.active-context-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--accent-purple);
  background-color: rgba(155, 81, 224, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  width: fit-content;
}

.chat-input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  resize: none;
  max-height: 160px;
  min-height: 24px;
  line-height: 1.5;
}

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

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

.left-tools {
  display: flex;
  align-items: center;
  gap: 4px;
}

.right-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.send-btn {
  background: var(--accent-gradient);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  cursor: pointer;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  opacity: 0.5;
  pointer-events: none;
}

.send-btn.active {
  opacity: 1;
  pointer-events: auto;
}

.send-btn:hover {
  transform: scale(1.05);
}

.mic-btn.listening {
  color: #ff4d4d;
  animation: pulseMic 1.2s infinite;
}

@keyframes pulseMic {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255, 77, 77, 0.4); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(255, 77, 77, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(255, 77, 77, 0); }
}

.disclaimer-text {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ==========================================================================
   MODAL COMPONENT (Context & Training)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: var(--bg-modal);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  padding: 28px;
  box-shadow: var(--shadow-md);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-overlay.active .modal-card {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.modal-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.presets-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-chip {
  background-color: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-chip:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.context-textarea {
  width: 100%;
  min-height: 140px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
}

.context-textarea:focus {
  border-color: var(--accent-purple);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.btn-primary {
  background: var(--accent-gradient);
  border: none;
  color: #ffffff;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  opacity: 0.9;
  box-shadow: var(--shadow-glow);
}

/* Overlay for Mobile Drawer Sidebar */
.sidebar-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.5);
  z-index: 90;
}

/* Sidebar Header Button Toggle Rule */
#openSidebarMobileBtn {
  display: flex;
}

@media (min-width: 901px) {
  .sidebar:not(.collapsed) ~ .main-content #openSidebarMobileBtn {
    display: none;
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN (PC, Laptop, Tablet & Mobile)
   ========================================================================== */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    transform: translateX(-100%);
    box-shadow: var(--shadow-md);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop.show {
    display: block;
  }

  .greeting-headline {
    font-size: 2.4rem;
  }

  .greeting-subtext {
    font-size: 2rem;
  }
}

@media (max-width: 600px) {
  .top-header {
    padding: 0 12px;
  }

  .messages-feed {
    padding: 0 12px 30px 12px;
  }

  .welcome-screen {
    padding: 20px 16px;
  }

  .greeting-headline {
    font-size: 2rem;
  }

  .greeting-subtext {
    font-size: 1.6rem;
    margin-bottom: 24px;
  }

  .suggestions-grid {
    grid-template-columns: 1fr;
  }

  .input-area-wrapper {
    padding: 0 12px 12px 12px;
  }

  .modal-card {
    padding: 20px;
    width: 95%;
  }
}