:root {
  --brand-primary: #0F172A;
  --brand-primary-light: #1E293B;
  --brand-primary-dark: #020617;
  --brand-accent: #2563EB;
  --brand-accent-soft: #EFF6FF;

  --slate-50: #FAFAFA;
  --slate-100: #F4F4F5;
  --slate-200: #E4E4E7;
  --slate-300: #D4D4D8;
  --slate-400: #A1A1AA;
  --slate-500: #71717A;
  --slate-600: #52525B;
  --slate-700: #3F3F46;
  --slate-800: #27272A;
  --slate-900: #18181B;

  --brand-text: #3F3F46;
  --brand-muted: #71717A;
  --brand-dimmed: #A1A1AA;
  --brand-border: #E4E4E7;
  --brand-border-strong: #D4D4D8;

  --brand-page-bg: #FFFFFF;
  --brand-surface: #FFFFFF;
  --brand-sidebar-bg: #FFFFFF;

  --score-success: #16A34A;
  --score-success-bg: #F0FDF4;
  --score-warning: #D97706;
  --score-warning-bg: #FEFCE8;
  --score-danger: #DC2626;
  --score-danger-bg: #FEF2F2;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04), 0 1px 1px 0 rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: var(--shadow-sm);

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --sidebar-width: 220px;
  --sidebar-collapsed-width: 64px;
  --header-height: 56px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Rob, Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--brand-text);
  background: var(--brand-page-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 14px;
  line-height: 1.55;
  font-weight: 400;
}
h1, h2, h3, h4, h5 { margin: 0; color: var(--brand-primary); font-weight: 600; letter-spacing: -0.005em; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--brand-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-border-strong); }
::selection { background: rgba(15, 23, 42, 0.08); }

/* === 布局 === */
.app-shell { min-height: 100vh; padding-left: var(--sidebar-width); }
.app-sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-width);
  background: var(--brand-sidebar-bg);
  border-right: 1px solid var(--brand-border);
  padding: 16px 12px;
  display: flex; flex-direction: column;
  z-index: 50;
}
.app-brand { display: flex; align-items: center; gap: 10px; padding: 12px 8px 16px; }
.app-brand-mark {
  width: 32px; height: 32px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.app-brand-text { font-weight: 700; color: var(--brand-primary); font-size: 15px; line-height: 1.2; letter-spacing: 0; white-space: nowrap; }
.app-brand-sub { font-size: 11px; color: var(--brand-muted); margin-top: 2px; }
.app-nav { display: flex; flex-direction: column; gap: 2px; margin-top: 8px; }
.app-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--radius-md);
  color: var(--brand-muted); font-size: 13px; font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.app-nav-item:hover { background: var(--slate-100); color: var(--brand-primary); }
.app-nav-item.active { background: var(--slate-100); color: var(--brand-primary); }
.app-nav-item i { font-size: 16px; }
.app-sidebar-footer { margin-top: auto; padding: 12px 8px 0; border-top: 1px solid var(--brand-border); }
.app-user { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--brand-muted); }
.app-user strong { color: var(--brand-primary); }

.app-main { padding: 24px 32px 48px; max-width: 1280px; margin: 0 auto; }
.app-page-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 24px; }
.app-page-title { font-size: 22px; font-weight: 600; }
.app-page-sub { color: var(--brand-muted); font-size: 13px; margin-top: 4px; }

/* === 卡片 === */
.card {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  margin-bottom: 16px;
}
.card-body { padding: 16px; }
.card-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--brand-border);
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 13px; color: var(--brand-primary);
}
.card-shadow { box-shadow: var(--shadow-xs); }

/* === 统计卡 === */
.stat-card { padding: 14px 16px; }
.stat-num { font-size: 24px; font-weight: 700; color: var(--brand-primary); line-height: 1.2; }
.stat-label { color: var(--brand-muted); font-size: 12px; margin-top: 2px; }
.stat-trend { font-size: 11px; color: var(--brand-muted); margin-top: 6px; }

/* === 表格 === */
.table { font-size: 13px; margin: 0; }
.table > :not(caption) > * > * { padding: 10px 12px; }
.table thead th {
  background: var(--slate-50);
  color: var(--brand-muted);
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--brand-border);
  white-space: nowrap;
}
.table tbody td { border-bottom: 1px solid var(--brand-border); vertical-align: top; }
.table tbody tr:hover { background: var(--slate-50); }
.table tbody tr:last-child td { border-bottom: none; }

/* === 表单 === */
.form-control, .form-select {
  border-color: var(--brand-border-strong);
  border-radius: var(--radius-md);
  padding: 7px 10px;
  font-size: 13px;
  background: var(--brand-surface);
}
.form-control:focus, .form-select:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
}
.form-label { font-size: 12px; color: var(--brand-muted); font-weight: 500; margin-bottom: 4px; }
.form-text { font-size: 12px; color: var(--brand-muted); }

/* === 按钮 === */
.btn { border-radius: var(--radius-md); font-weight: 500; padding: 7px 14px; font-size: 13px; border: 1px solid transparent; transition: all 0.15s; }
.btn-primary { background: var(--brand-primary); border-color: var(--brand-primary); color: #fff; }
.btn-primary:hover { background: var(--brand-primary-light); border-color: var(--brand-primary-light); }
.btn-primary:active { background: var(--brand-primary-dark); }
.btn-secondary { background: var(--brand-surface); border-color: var(--brand-border-strong); color: var(--brand-text); }
.btn-secondary:hover { background: var(--slate-100); }
.btn-outline-primary { color: var(--brand-primary); border-color: var(--brand-border-strong); background: var(--brand-surface); }
.btn-outline-primary:hover { background: var(--slate-100); color: var(--brand-primary); }
.btn-outline-secondary { color: var(--brand-muted); border-color: var(--brand-border-strong); background: var(--brand-surface); }
.btn-outline-secondary:hover { background: var(--slate-100); color: var(--brand-primary); }
.btn-outline-success { color: var(--score-success); border-color: var(--brand-border-strong); background: var(--brand-surface); }
.btn-outline-success:hover { background: var(--score-success-bg); }
.btn-outline-warning { color: var(--score-warning); border-color: var(--brand-border-strong); background: var(--brand-surface); }
.btn-outline-warning:hover { background: var(--score-warning-bg); }
.btn-outline-danger { color: var(--score-danger); border-color: var(--brand-border-strong); background: var(--brand-surface); }
.btn-outline-danger:hover { background: var(--score-danger-bg); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-link { color: var(--brand-primary); padding: 0; }
.btn-group-sm > .btn, .btn-sm { border-radius: var(--radius-sm); }

/* === 徽章 === */
.badge { font-weight: 500; padding: 3px 8px; font-size: 11px; border-radius: var(--radius-sm); }
.bg-primary { background: #DBEAFE; color: #1E40AF; font-weight: 600; }
.bg-secondary { background: var(--slate-200); color: #27272A; }
.bg-success { background: #BBF7D0; color: #14532D; font-weight: 600; }
.bg-warning { background: var(--score-warning-bg); color: var(--score-warning); }
.bg-danger { background: var(--score-danger-bg); color: var(--score-danger); }
.bg-dark { background: var(--slate-800); color: #fff; }

/* === 进度条 === */
.progress { background: var(--slate-100); border-radius: 99px; height: 6px; }
.progress-thin { height: 4px; }
.progress-bar { background: var(--brand-primary); border-radius: 99px; }
.progress-bar.bg-warning { background: var(--score-warning); }
.progress-bar.bg-success { background: var(--score-success); }

/* === Tab === */
.nav-tabs { border-bottom: 1px solid var(--brand-border); gap: 4px; }
.nav-tabs .nav-link {
  border: none; border-radius: var(--radius-md);
  padding: 8px 14px;
  color: var(--brand-muted); font-weight: 500; font-size: 13px;
}
.nav-tabs .nav-link:hover { color: var(--brand-primary); }
.nav-tabs .nav-link.active { background: var(--slate-100); color: var(--brand-primary); }

.nav-pills { gap: 4px; }
.nav-pills .nav-link {
  border-radius: var(--radius-md); padding: 5px 12px;
  color: var(--brand-muted); font-size: 12px; font-weight: 500;
}
.nav-pills .nav-link.active { background: var(--slate-100); color: var(--brand-primary); }

/* === 回答预览 === */
.answer-preview {
  max-height: 360px; overflow: auto;
  background: var(--slate-50); border: 1px solid var(--brand-border); border-radius: var(--radius-md);
  padding: 14px 18px; font-size: 13px; line-height: 1.7; color: var(--brand-text);
}
.answer-preview pre { background: var(--slate-100); padding: 10px; border-radius: var(--radius-sm); overflow-x: auto; font-size: 12px; }
.answer-preview code { background: var(--slate-100); padding: 1px 5px; border-radius: 3px; font-size: 12px; }
.answer-preview pre code { background: transparent; padding: 0; }
.answer-preview h1, .answer-preview h2, .answer-preview h3 { font-size: 14px; margin: 0.6em 0 0.3em; font-weight: 600; }
.answer-preview p { margin: 0.5em 0; }
.answer-preview ul, .answer-preview ol { padding-left: 1.5em; }
.answer-preview blockquote { border-left: 3px solid var(--brand-border-strong); margin: 0.5em 0; padding: 0.2em 0.8em; color: var(--brand-muted); }
.answer-preview table { border-collapse: collapse; }
.answer-preview th, .answer-preview td { border: 1px solid var(--brand-border); padding: 4px 8px; }

/* === 日志面板 === */
.log-box {
  max-height: 480px; overflow: auto;
  background: #0E1117; color: #D0D7DE;
  padding: 14px 16px; border-radius: var(--radius-md);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px; line-height: 1.6;
}
.log-info { color: #D0D7DE; }
.log-warn { color: #E3B341; }
.log-error { color: #FF7B72; }

/* === 顶部 demo 横幅 === */
.demo-banner {
  background: linear-gradient(90deg, #FEF3C7, #FED7AA);
  color: #92400E; padding: 8px 24px;
  font-size: 12px; text-align: center; font-weight: 500;
  border-bottom: 1px solid #FCD34D;
}
.demo-banner code { background: rgba(146, 64, 14, 0.12); padding: 1px 6px; border-radius: 3px; font-size: 11px; }

/* === Toast === */
.toast-container { z-index: 2000; }
.toast { background: var(--brand-primary); color: #fff; border-radius: var(--radius-md); }

/* === Modal === */
.modal-content { border: 1px solid var(--brand-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.modal-header, .modal-footer { border-color: var(--brand-border); padding: 12px 16px; }
.modal-title { font-size: 15px; font-weight: 600; }
.modal-body { padding: 16px; }

/* === 工具类 === */
.text-muted { color: var(--brand-muted) !important; }
.text-success { color: var(--score-success) !important; }
.text-danger { color: var(--score-danger) !important; }
.text-warning { color: var(--score-warning) !important; }
.text-primary { color: var(--brand-primary) !important; }
.text-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.font-monospace, code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.cursor-pointer { cursor: pointer; }
.divider { border-top: 1px solid var(--brand-border); margin: 12px 0; }

@media (max-width: 768px) {
  :root { --sidebar-width: 0; }
  .app-shell { padding-left: 0; }
  .app-sidebar { display: none; }
  .app-main { padding: 16px; }
}

@keyframes fadeHighlight {
  0% { background: #DBEAFE; }
  60% { background: #EFF6FF; }
  100% { background: transparent; }
}