/* ============================================
   Gemini Chat - Claude-Style Professional Theme
   Based on christoperyu.com design system
   ============================================ */

/* CSS Variables */
:root {
  /* Backgrounds */
  --bg-main: #171717;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --bg-sidebar: #1a1a1a;

  /* Brand Gradient */
  --gradient-start: #3BDCD5;
  --gradient-mid: #67F273;
  --gradient-end: #BFE849;

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: #e5e5e5;
  --text-muted: #A1A1AA;
  --text-inverted: #171717;

  /* Borders */
  --border-subtle: #2d2d2d;
  --border-hover: #404040;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Geist Mono', 'Fira Code', monospace;

  /* Sizing */
  --sidebar-width: 260px;
  --header-height: 56px;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(90deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   App Layout
   ============================================ */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.new-chat-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.new-chat-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--gradient-start);
}

.sidebar-conversations {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.conversation-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
  margin-bottom: 2px;
  position: relative;
}

.conversation-item:hover {
  background: var(--bg-tertiary);
}

.conversation-item.active {
  background: var(--bg-tertiary);
}

.conversation-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: linear-gradient(180deg, var(--gradient-start), var(--gradient-mid));
  border-radius: 0 2px 2px 0;
}

.conversation-title {
  flex: 1;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-delete {
  opacity: 0;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.conversation-item:hover .conversation-delete {
  opacity: 1;
}

.conversation-delete:hover {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border-subtle);
  flex-shrink: 0;
}

#userName {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-footer .logout-btn {
  color: var(--text-muted);
  padding: 8px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  text-decoration: none;
}

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

/* Sidebar Toggle (Mobile) */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px;
  color: var(--text-primary);
  cursor: pointer;
}

/* ============================================
   Main Chat Area
   ============================================ */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-main);
}

/* Header */
.chat-header {
  height: var(--header-height);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.header-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  font-size: 1.25rem;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-title h1 {
  font-size: 1.125rem;
  font-weight: 600;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-mid);
  animation: pulse 2s infinite;
}

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

/* ============================================
   Messages Container
   ============================================ */
.chat-container {
  flex: 1;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.messages {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
}

/* Welcome Screen */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  text-align: center;
  padding: 40px 20px;
}

.welcome-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.welcome-screen h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.welcome-screen p {
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 32px;
}

.welcome-hints {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.hint-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.hint-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--gradient-start);
  color: var(--text-primary);
}

/* Message Rows (Claude-style) */
.message {
  display: flex;
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-subtle);
  animation: fadeIn 0.3s ease;
}

.message:last-child {
  border-bottom: none;
}

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

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
}

.message.user .message-avatar {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: var(--text-inverted);
}

.message.assistant .message-avatar {
  background: var(--bg-tertiary);
  color: var(--gradient-start);
}

.message-content {
  flex: 1;
  min-width: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.message.user .message-content {
  color: var(--text-primary);
}

/* Streaming indicator */
.message.streaming .message-content::after {
  content: '▋';
  animation: blink 1s infinite;
  color: var(--gradient-start);
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Code blocks in messages */
.message-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.message-content code {
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.message-content pre code {
  background: none;
  padding: 0;
}

/* Lists */
.message-content ul, .message-content ol {
  margin: 12px 0;
  padding-left: 24px;
}

.message-content li {
  margin: 6px 0;
}

/* Paragraphs */
.message-content p {
  margin: 12px 0;
}

.message-content p:first-child {
  margin-top: 0;
}

.message-content p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Input Area
   ============================================ */
.input-area {
  padding: 16px 24px 24px;
  background: var(--bg-main);
  border-top: 1px solid var(--border-subtle);
}

.input-wrapper {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 12px 16px;
  transition: border-color 0.2s ease;
}

.input-wrapper:focus-within {
  border-color: var(--gradient-start);
}

#messageInput {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  resize: none;
  max-height: 200px;
  line-height: 1.5;
}

#messageInput::placeholder {
  color: var(--text-muted);
}

#messageInput:focus {
  outline: none;
}

.send-btn, .cancel-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.send-btn {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  color: var(--text-inverted);
}

.send-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(59, 220, 213, 0.3);
}

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

.cancel-btn {
  background: #ef4444;
  color: white;
}

.cancel-btn:hover {
  background: #dc2626;
}

.hidden {
  display: none !important;
}

.input-hint {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 24px;
  max-width: 400px;
  width: 90%;
}

.modal h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.modal p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.modal-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-btn.cancel {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.modal-btn.cancel:hover {
  background: var(--bg-tertiary);
}

.modal-btn.danger {
  background: #ef4444;
  border: none;
  color: white;
}

.modal-btn.danger:hover {
  background: #dc2626;
}

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

.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 3rem;
  max-width: 400px;
  width: 100%;
  text-align: center;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.login-card h1 {
  font-size: 1.75rem;
  font-weight: 700;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.9rem;
}

.google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: var(--text-primary);
  color: var(--text-inverted);
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.google-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
}

.security-note {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
  }

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

  .sidebar-toggle {
    display: flex;
  }

  .chat-header {
    padding-left: 56px;
  }

  .messages {
    padding: 16px;
  }

  .message {
    padding: 16px 0;
  }

  .input-area {
    padding: 12px 16px 16px;
  }

  .input-wrapper {
    padding: 10px 12px;
    border-radius: 12px;
  }

  .welcome-hints {
    flex-direction: column;
  }

  .hint-btn {
    width: 100%;
    justify-content: center;
  }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 40;
}

.sidebar-overlay.visible {
  display: block;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}