/* ============ Global Reset & Base ============ */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f0f4f8;
  --bg-hover: rgba(37, 99, 235, 0.06);
  --bg-active: rgba(37, 99, 235, 0.12);
  --bg-input: #f8fafc;
  --bg-code: #f1f5f9;
  --bg-thinking: #f1f5f9;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;

  --border-light: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.08);
  --border-input: rgba(0, 0, 0, 0.08);

  --accent-primary: #2563eb;
  --accent-primary-hover: #3b82f6;
  --accent-primary-light: rgba(37, 99, 235, 0.08);
  --accent-primary-medium: rgba(37, 99, 235, 0.15);

  --tool-color: #5478FF;
  --tool-color-hover: #3d5ce0;
  --tool-bg: rgba(84, 120, 255, 0.18);
  --tool-bg-hover: rgba(84, 120, 255, 0.28);
  --tool-border: rgba(84, 120, 255, 0.22);

  --attachment-color: #ca8a04;
  --attachment-color-hover: #a16207;
  --attachment-bg: rgba(202, 138, 4, 0.15);

  --success-color: #059669;
  --success-bg: rgba(16, 185, 129, 0.1);
  --danger-color: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.08);

  --scrollbar-thumb: rgba(0, 0, 0, 0.08);
  --scrollbar-thumb-sidebar: rgba(0, 0, 0, 0.1);

  --overlay-bg: rgba(0, 0, 0, 0.3);
  --avatar-gradient: linear-gradient(135deg, #3b82f6, #60a5fa);
}

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #141414;
  --bg-tertiary: #0a0a0a;
  --bg-hover: rgba(255, 255, 255, 0.08);
  --bg-active: rgba(255, 255, 255, 0.12);
  --bg-input: #141414;
  --bg-code: #141414;
  --bg-thinking: #141414;

  --text-primary: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-tertiary: #606060;

  --border-light: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-input: rgba(255, 255, 255, 0.1);

  --accent-primary: #3b82f6;
  --accent-primary-hover: #60a5fa;
  --accent-primary-light: rgba(59, 130, 246, 0.15);
  --accent-primary-medium: rgba(59, 130, 246, 0.25);

  --tool-color: #5478FF;
  --tool-color-hover: #7a96ff;
  --tool-bg: rgba(84, 120, 255, 0.28);
  --tool-bg-hover: rgba(84, 120, 255, 0.40);
  --tool-border: rgba(84, 120, 255, 0.32);

  --attachment-color: #facc15;
  --attachment-color-hover: #fde047;
  --attachment-bg: rgba(250, 204, 21, 0.22);

  --success-color: #34d399;
  --success-bg: rgba(52, 211, 153, 0.15);
  --danger-color: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.15);

  --scrollbar-thumb: rgba(255, 255, 255, 0.1);
  --scrollbar-thumb-sidebar: rgba(255, 255, 255, 0.15);

  --overlay-bg: rgba(0, 0, 0, 0.6);
  --avatar-gradient: linear-gradient(135deg, #3b82f6, #60a5fa);
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  background: var(--bg-tertiary);
  background-image:
    radial-gradient(ellipse at 20% 50%, var(--accent-primary-light) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(52, 211, 153, 0.05) 0%, transparent 50%);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s, color 0.2s;
}

#app {
  height: 100%;
}

/* ============ Main Panel (shared by ChatView, FileExplorer, etc.) ============ */
.main-panel {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  min-width: 0;
  background: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-left: 1px solid var(--border-light);
}

/* ============ Transitions ============ */
.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.2s;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

/* ============ Animations ============ */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spinner {
  animation: spin 1s linear infinite;
}

/* ============ Markdown content shared styles ============ */
.md-content {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  word-break: break-word;
}

.md-content p {
  margin: 0 0 8px;
}

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

.md-content hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 16px 0;
}

.md-content pre {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
  max-width: 100%;
}

.md-content pre code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 13px;
  line-height: 1.5;
}

/* 代码块滚动条 */
.md-content pre::-webkit-scrollbar,
.code-block pre code::-webkit-scrollbar {
  height: 6px;
}

.md-content pre::-webkit-scrollbar-track,
.code-block pre code::-webkit-scrollbar-track {
  background: transparent;
}

.md-content pre::-webkit-scrollbar-thumb,
.code-block pre code::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

.md-content pre::-webkit-scrollbar-thumb:hover,
.code-block pre code::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* 代码块头部：语言标签 + 复制按钮 */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  margin: 8px 0;
  max-width: 100%;
  overflow: hidden;
}

.code-block pre {
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
}

.code-block pre code {
  display: block;
  padding: 12px 12px 12px 16px;
  overflow-x: auto;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px 6px 16px;
  background: var(--bg-code);
}

.code-lang {
  color: var(--text-tertiary);
  font-size: 11px;
  font-weight: 500;
}

.code-copy-btn {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  transition: all 0.15s;
}

.code-copy-btn:hover {
  color: var(--accent-primary);
  background: var(--accent-primary-light);
}

.md-content code {
  background: var(--accent-primary-light);
  color: var(--accent-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.md-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.md-content ul,
.md-content ol {
  padding-left: 20px;
  margin: 8px 0;
}

.md-content blockquote {
  border-left: 3px solid rgba(59, 130, 246, 0.4);
  padding-left: 12px;
  color: var(--text-secondary);
  margin: 8px 0;
}

.md-content table {
  border-collapse: collapse;
  margin: 8px 0;
  width: 100%;
}

.md-content th,
.md-content td {
  border: 1px solid var(--border-medium);
  padding: 8px 12px;
  text-align: left;
}

.md-content th {
  background: var(--bg-code);
}

.md-content .math-block {
  display: block;
  text-align: center;
  padding: 12px 0;
  margin: 8px 0;
  overflow-x: auto;
}

/* ============ Scrollbar ============ */
textarea::-webkit-scrollbar,
.cm-scroller::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

textarea::-webkit-scrollbar-track,
.cm-scroller::-webkit-scrollbar-track {
  background: transparent;
}

textarea::-webkit-scrollbar-thumb,
.cm-scroller::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

textarea::-webkit-scrollbar-thumb:hover,
.cm-scroller::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

textarea::-webkit-resizer {
  background: transparent;
}

.cm-scroller {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

/* ============ Range Slider ============ */
input[type="range"] {
  width: 100%;
  height: 8px;
  min-height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border-medium);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  margin-top: -6px;
  transition: transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: 4px;
  background: var(--border-medium);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

/* ============ Button Base ============ */
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  background: var(--bg-code);
  color: var(--text-tertiary);
}

.btn-icon:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

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

/* ============ Modal ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal {
  background: var(--bg-primary);
  border-radius: 12px;
  width: 90%;
  max-width: 480px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-content {
  border-radius: 16px;
  width: 90%;
  max-width: 520px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 24px;
  background: color-mix(in srgb, var(--bg-primary) 75%, transparent);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border: 1px solid var(--border-medium);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.2);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  display: flex;
  gap: 12px;
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* ============ Action Buttons ============ */
.btn-primary,
.btn-secondary,
.btn-danger {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-primary-hover);
}

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

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

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

.btn-danger {
  background: var(--danger-color);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  opacity: 0.9;
}

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

/* ============ Tab Navigation ============ */
.period-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-input);
  padding: 3px;
  border-radius: 8px;
}

.tab {
  padding: 4px 12px;
  border: none;
  background: none;
  color: var(--text-tertiary);
  font-size: 12px;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.tab:hover {
  color: var(--text-secondary);
}

.tab.active {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

/* ============ Message Bubble Shared ============ */
.message-bubble {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  width: 100%;
}

.message-bubble.user {
  flex-direction: row-reverse;
}

.message-container {
  display: flex;
  flex-direction: column;
  min-width: 200px;
  width: 100%;
}

.message-bubble.user .message-container {
  align-items: flex-end;
  width: fit-content;
  max-width: 85%;
}

.message-bubble.assistant .message-container {
  align-items: flex-start;
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
}

.message-bubble.assistant .message-body {
  width: 100%;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: -0.3px;
  flex-shrink: 0;
}

.user .avatar {
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: white;
  font-size: 12px;
}

.assistant .avatar {
  background: var(--avatar-gradient);
  color: white;
  font-size: 12px;
}

.message-body {
  flex: 1;
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  background: var(--bg-primary);
  transition: background 0.2s, border-color 0.2s;
}

/* ============ Form ============ */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
  box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}


.form-group select:hover {
  border-color: var(--accent-primary);
}

.form-group select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group select option {
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: 10px;
}

[data-theme="dark"] .form-group select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a0a0a0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

/* ============ Small Icon Button ============ */
.btn-icon-sm {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-tertiary);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s;
}

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

.btn-icon-sm.danger:hover {
  background: var(--danger-bg);
  color: var(--danger-color);
}

/* ============ Ghost Button (base for small icon buttons) ============ */
.ghost-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.15s;
}

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

.ghost-btn.danger:hover {
  background: var(--danger-bg);
  color: var(--danger-color);
}

.ghost-btn.accent:hover {
  background: var(--accent-primary-light);
  color: var(--accent-primary);
}

.ghost-btn.success:hover {
  background: var(--success-bg);
  color: var(--success-color);
}

/* ============ Empty / Loading State ============ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 12px;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* ============ Thin Scrollbar (4px) ============ */
.scrollbar-thin {
  overflow-y: auto;
}

.scrollbar-thin::-webkit-scrollbar {
  width: 4px;
}

.scrollbar-thin::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 2px;
}

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

/* ============ Panel Header (title + actions) ============ */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.panel-title svg {
  color: var(--text-tertiary);
}

.panel-title h4 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

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