* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

:root {
  --bg-primary: #343541;
  --bg-secondary: #202123;
  --bg-message-user: #444654;
  --bg-message-assistant: #40414f;
  --bg-input: #40414f;
  --border-color: #444654;
  --border-color-2: #565869;
  --text-primary: #ececf1;
  --text-secondary: #8e8ea0;
  --text-tertiary: #c5c5d2;
  --code-bg: #282c34;
  --hover-bg: #2a2b32;
  --hover-bg-2: #4a4b5a;
  --accent: #10a37f;
  --accent-hover: #0e9770;
  --danger: #ef4444;
  --sidebar-border: rgba(255, 255, 255, 0.06);
}

body.light-theme {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f8;
  --bg-message-user: #f7f7f8;
  --bg-message-assistant: #ffffff;
  --bg-input: #ffffff;
  --border-color: #e5e5e5;
  --border-color-2: #d1d1d1;
  --text-primary: #0d0d0d;
  --text-secondary: #6e6e80;
  --text-tertiary: #2d2d2d;
  --code-bg: #f4f4f4;
  --hover-bg: #ececec;
  --hover-bg-2: #e0e0e0;
  --accent: #10a37f;
  --accent-hover: #0e9770;
  --sidebar-border: rgba(0, 0, 0, 0.08);
}

body {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background 0.3s, color 0.3s;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

/* Sidebar header - UPDATED */
.sidebar-header {
  padding: 0 12px;
  border-bottom: 1px solid var(--sidebar-border);
  display: flex;
  align-items: center;
  height: 56px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.new-chat-btn {
  width: 100%;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s;
  height: 36px;
}

.new-chat-btn:hover {
  background: var(--hover-bg);
}

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

.new-chat-btn svg {
  width: 16px;
  height: 16px;
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.chat-list-loading {
  padding: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

.chat-item {
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  transition: background 0.2s;
  position: relative;
  gap: 8px;
}

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

.chat-item.active {
  background: var(--bg-primary);
}

.chat-item-content {
  flex: 1;
  overflow: hidden;
  min-width: 0;
}

.chat-item-title {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 2px;
  color: var(--text-primary);
}

.chat-item-preview {
  font-size: 12px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.delete-chat {
  opacity: 0;
  padding: 4px 8px;
  background: var(--danger);
  border: none;
  border-radius: 4px;
  color: white;
  font-size: 12px;
  cursor: pointer;
  transition: opacity 0.2s;
  flex-shrink: 0;
}

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

/* Main area */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  position: relative;
  min-width: 0;
  overflow-x: hidden;
}

.chat-header {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--sidebar-border);
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 61px;
  flex-shrink: 0;
}

/* Hamburger menu button - mobile only */
.hamburger-btn {
  display: none;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
}

.hamburger-btn:hover {
  background: var(--hover-bg);
}

.hamburger-btn svg {
  width: 20px;
  height: 20px;
  display: block;
}

.model-selector {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  outline: none;
  min-width: 150px;
}

.model-selector:hover {
  background: var(--hover-bg-2);
}

.model-selector:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* User ID - hidden */
.user-id-display {
  display: none;
}

/* Credits display in header */
.credits-display {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-input);
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-primary);
  margin-left: 12px;
}

/* Hidden state for credits display */
.credits-display.hidden {
  display: none !important;
}

.credits-display svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent);
}

#credits-amount {
  font-weight: 500;
  color: var(--accent);
}

/* Hide credits display on very small screens */
@media (max-width: 480px) {
  .credits-display {
    display: none;
  }
}

.theme-toggle {
  margin-left: auto;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--hover-bg-2);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Chat area */
#chat-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px;
  padding-bottom: 16px;
  scroll-padding-bottom: 16px;
  position: relative;
}

#chat {
  max-width: 950px;
  margin: 0 auto;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

.chat-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
  color: var(--text-secondary);
}

.chat-empty {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  text-align: center;
}

.chat-empty svg {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.message {
  margin-bottom: 16px;
  padding: 16px;
  border-radius: 8px;
  position: relative;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

.user {
  background: var(--bg-message-user);
}

.assistant {
  background: var(--bg-message-assistant);
}

.message-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.message-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: var(--bg-input);
  flex-shrink: 0;
}

.message-icon svg {
  width: 18px;
  height: 18px;
}

.message-label {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.message-actions {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  opacity: 0;
  transition: opacity 0.2s;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.message-actions.top-actions {
  margin-top: 0;
  margin-bottom: 12px;
}

.message:hover .message-actions {
  opacity: 1;
}

.message-btn {
  padding: 5px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.message-btn svg {
  width: 14px;
  height: 14px;
}

.message-btn:hover {
  background: var(--hover-bg-2);
  color: var(--text-primary);
}

.tooltip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  margin-bottom: 4px;
  border: 1px solid var(--border-color);
  z-index: 10;
}

.message-btn:hover .tooltip {
  opacity: 1;
}

.scroll-to-top-btn {
  padding: 5px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.scroll-to-top-btn svg {
  width: 14px;
  height: 14px;
}

/* Floating scroll to bottom button */
.scroll-to-bottom {
  position: fixed;
  bottom: 140px;
  right: 40px;
  width: 48px;
  height: 48px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: all 0.2s;
  z-index: 100;
}

.scroll-to-bottom.visible {
  display: flex;
}

/* Thinking section */
.thinking-live {
  margin-bottom: 12px;
}

.thinking-live summary {
  font-style: italic;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  font-size: 13px;
  padding: 6px 0;
  outline: none;
}

.thinking-live summary:hover {
  color: var(--text-primary);
}

.thinking-live pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color-2);
  border-left: 3px solid var(--text-secondary);
  border-radius: 6px;
  padding: 12px;
  margin-top: 8px;
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
  color: var(--text-tertiary);
}

/* Markdown content */
.markdown-content {
  line-height: 1.6;
  color: var(--text-primary);
  overflow-wrap: break-word;
  word-wrap: break-word;
}
.markdown-content p { margin: 4px 0; }
.markdown-content h1, .markdown-content h2, .markdown-content h3 { margin: 12px 0 8px 0; font-weight: 600; }
.markdown-content code {
  font-family: 'SFMono-Regular', Consolas, monospace;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  color: var(--text-tertiary);
}
.code-block-wrapper {
  position: relative;
  margin: 6px 0;
  max-width: 100%;
  overflow: hidden;
}
.code-block-wrapper pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  padding: 28px 12px 12px 12px;
  overflow-x: auto;
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 13px;
  margin: 0;
  max-width: 100%;
}
.code-block-wrapper pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  font-size: 13px;
  color: inherit;
}
.code-copy-btn {
  position: absolute;
  top: 6px; right: 6px;
  width: 28px; height: 28px;
  background: var(--hover-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0.7;
}
.code-copy-btn:hover { opacity: 1; }
.code-copy-btn svg { width: 16px; height: 16px; }

/* Table Styling */
.markdown-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  overflow: hidden;
  display: block;
  overflow-x: auto;
}
.markdown-content table thead {
  background: var(--hover-bg);
}
.markdown-content table th {
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border-color-2);
  color: var(--text-primary);
  white-space: nowrap;
}
.markdown-content table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}
.markdown-content table tr:last-child td {
  border-bottom: none;
}
.markdown-content table tbody tr:hover {
  background: var(--hover-bg);
}

/* Syntax Highlighting Adjustments for Light Theme */
body.light-theme .hljs {
  background: #f6f8fa;
  color: #24292e;
}

/* Input area */
.input-wrapper {
  padding: 20px;
  background: var(--bg-primary);
  border-top: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.input-container {
  max-width: 950px;
  margin: 0 auto;
  position: relative;
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#user-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 15px;
  resize: none;
  min-height: 50px;
  max-height: 200px;
  outline: none;
  min-width: 0;
}

#user-input:focus {
  border-color: var(--text-secondary);
}

/* Controls Row */
.controls-row {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
  align-items: center;
  flex-wrap: wrap;
  min-height: 32px;
}

/* Stylish Thinking Button */
.thinking-btn {
  padding: 4px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  height: 28px;
}

.thinking-btn svg {
  width: 14px;
  height: 14px;
}

.thinking-btn:hover:not(:disabled) {
  background: var(--hover-bg-2);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

.thinking-btn.active {
  background: rgba(16, 163, 127, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.thinking-btn:disabled {
  cursor: default;
  opacity: 0.8;
}

.thinking-btn.hidden {
  display: none;
}

/* Reasoning Level Select */
.reasoning-select {
  padding: 4px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 12px;
  height: 28px;
  outline: none;
  cursor: pointer;
}

.reasoning-select:hover {
  border-color: var(--text-secondary);
}

/* Token Slider */
.slider-container {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-input);
  padding: 0 10px;
  border-radius: 20px;
  height: 28px;
  border: 1px solid var(--border-color-2);
}

.token-slider {
  -webkit-appearance: none;
  width: 100px;
  height: 4px;
  background: var(--border-color-2);
  border-radius: 2px;
  outline: none;
}

.token-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.token-value {
  min-width: 40px;
  text-align: right;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.send-btn {
  padding: 12px 24px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s;
  font-weight: 500;
  flex-shrink: 0;
}

.send-btn:hover {
  background: var(--accent-hover);
}

.send-btn:disabled {
  background: var(--bg-input);
  color: var(--border-color-2);
  cursor: not-allowed;
}

.status {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  margin-top: 8px;
}

.status.error {
  color: var(--danger);
}

.thinking-token-count {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-left: 10px;
}

/* 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: 999;
  opacity: 0;
  transition: opacity 0.3s;
}

.sidebar-overlay.visible {
  display: block;
  opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    z-index: 1000;
    height: 100%;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    border-right: none;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.3);
  }

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

  .hamburger-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .main {
    width: 100%;
    overflow-x: hidden;
  }

  #chat-container {
    padding: 16px;
  }

  #chat {
    max-width: 100%;
  }

  .message {
    padding: 12px;
  }

  .input-wrapper {
    padding: 12px;
  }

  .controls-row {
    gap: 8px;
  }

  .slider-container {
    padding: 0 8px;
  }

  .token-slider {
    width: 60px;
  }

  .send-btn {
    padding: 12px 16px;
  }

  .scroll-to-bottom {
    bottom: 120px;
    right: 20px;
  }

  .code-block-wrapper pre {
    font-size: 12px;
  }
}

/* HTML Preview Panel */
.html-preview-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 50%;
  height: 100vh;
  background: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
}

.html-preview-panel.open {
  transform: translateX(0);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.preview-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.preview-title svg {
  color: var(--accent);
}

.preview-actions {
  display: flex;
  gap: 6px;
}

.preview-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-input);
  border: 1px solid var(--border-color-2);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.preview-btn:hover {
  background: var(--hover-bg-2);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

.preview-btn.close-btn:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.preview-content {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: white;
}

#html-preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.preview-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  cursor: ew-resize;
  background: transparent;
  transition: background 0.2s;
  z-index: 10;
}

.preview-resize-handle:hover {
  background: var(--accent);
}

.preview-html-btn {
  right: 40px !important;
}

/* Smooth transition for main content */
.main {
  transition: margin-right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Responsive */
@media (max-width: 1200px) {
  .html-preview-panel {
    width: 60%;
  }
}

@media (max-width: 768px) {
  .html-preview-panel {
    width: 100%;
  }

  .html-preview-panel.open ~ .main {
    display: none;
  }
}

/* Reopen Preview Button */
.reopen-preview-btn {
  position: fixed;
  bottom: 200px;
  right: 40px;
  width: 56px;
  height: 56px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(16, 163, 127, 0.4);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 150;
}

.reopen-preview-btn.visible {
  display: flex;
}

.reopen-preview-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(16, 163, 127, 0.5);
}

.reopen-preview-btn:active {
  transform: scale(0.95);
}

.reopen-preview-btn svg {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

@media (max-width: 768px) {
  .reopen-preview-btn {
    bottom: 180px;
    right: 20px;
    width: 48px;
    height: 48px;
  }
}

/* Force both headers to be identical */
.sidebar-header,
.chat-header {
  height: 57px;
  min-height: 57px;
  max-height: 57px;
  box-sizing: border-box;
  margin: 0;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-header {
  padding: 0 12px;
}

.chat-header {
  padding: 0 20px;
  background: var(--bg-secondary);
}

/* Ensure parent containers have no extra spacing */
.sidebar {
  padding: 0;
  padding-top: 0;
}

.chat-main {
  padding: 0;
}

/* Hide hamburger on desktop */
.hamburger-btn {
  display: none;
}

@media (max-width: 768px) {
  .hamburger-btn {
    display: flex;
  }
}