:root {
  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1d4ed8;
  --color-primary-bg: #eff6ff;
  --color-success: #22c55e;
  --color-success-bg: #f0fdf4;
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-info: #06b6d4;
  --color-info-bg: #ecfdf5;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-text: #1e1e2f;
  --color-text-light: #4b5563;
  --color-text-inverse: #f8fafc;
  --color-bg: #fafafa;
  --color-bg-card: #ffffff;
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --code-border: #3b82f6;
  --link-color: var(--color-primary);
  --link-hover: var(--color-primary-dark);
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--color-gray-900);
}
h1 {
  font-size: 2.4rem;
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: 0.4rem;
}
h2 {
  font-size: 1.8rem;
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 0.3rem;
}
h3 {
  font-size: 1.4rem;
  color: var(--color-primary-dark);
}
h4 {
  font-size: 1.2rem;
  color: var(--color-gray-800);
}
h5 {
  font-size: 1.05rem;
  color: var(--color-gray-700);
}
h6 {
  font-size: 0.95rem;
  color: var(--color-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
p {
  margin: 0.8rem 0;
}
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}
strong, b {
  font-weight: 700;
  color: var(--color-gray-900);
}
small {
  font-size: 0.85rem;
  color: var(--color-gray-500);
}
ul, ol {
  margin: 0.8rem 0 0.8rem 1.8rem;
}
li {
  margin: 0.4rem 0;
}
hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 2px dashed var(--color-gray-300);
}
.horizontal-line {
  border: 0;
  border-top: 2px solid var(--color-gray-200);
  margin: 1.5rem 0;
}
.code-bar {
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 1rem 1.2rem;
  border-radius: 0.75rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 1rem 0;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border-left: 4px solid var(--code-border);
}
.code-block {
  margin: 1rem 0;
  border-radius: 0.75rem;
  overflow: hidden;
  border-left: 4px solid var(--code-border);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  background: var(--code-bg);
}
.code-block > .code-bar {
  margin: 0;
  border-radius: 0;
  border-left: 0;
  box-shadow: none;
  background: transparent;
}
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.4rem 0.6rem 0.4rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--code-text);
  background: rgba(127, 127, 127, 0.14);
  border-bottom: 1px solid rgba(127, 127, 127, 0.22);
  user-select: none;
}
.code-lang {
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.75;
}
.code-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.code-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  font-family: inherit;
  font-size: 0.75rem;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.4rem;
  cursor: pointer;
  opacity: 0.72;
  transition: opacity 0.15s, background-color 0.15s, border-color 0.15s;
}
.code-btn:hover {
  opacity: 1;
  background: rgba(127, 127, 127, 0.18);
  border-color: rgba(127, 127, 127, 0.3);
}
.code-btn:active { transform: translateY(1px); }
.code-btn:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 1px;
}
.code-btn svg {
  width: 13px;
  height: 13px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.code-btn.is-active {
  opacity: 1;
  background: rgba(127, 127, 127, 0.24);
  border-color: rgba(127, 127, 127, 0.4);
}
.code-block .code-bar.hljs {
  background: transparent !important;
  padding: 1rem 1.2rem !important;   
  color: var(--code-text) !important;
  overflow-x: auto !important;
}
.code-block .code-bar.hljs code,
.code-block .code-bar.hljs .hljs {
  background: transparent !important;
  padding: 0 !important;
}
.bar {
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--font-mono);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  white-space: pre-wrap;
  margin: 1rem 0;
}
.tips {
  background: var(--color-success-bg);
  border-left: 5px solid var(--color-success);
  padding: 0.8rem 1.2rem;
  margin: 1rem 0;
  border-radius: 0.5rem;
  color: #166534;
}
.tips strong,
.tips b {
  color: #14532d;
}
.alert {
  padding: 0.8rem 1.2rem;
  margin: 1rem 0;
  border-radius: 0.5rem;
  border-left: 5px solid transparent;
}
.alert-primary {
  background: var(--color-primary-bg);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}
.alert-danger {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: #991b1b;
}
.alert-warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: #92400e;
}
.alert-info {
  background: var(--color-info-bg);
  border-color: var(--color-info);
  color: #0e7490;
}
.bold {
  font-weight: 700;
  color: var(--color-gray-900);
}
.red {
  color: var(--color-danger);
  font-weight: 600;
}
.white {
  color: var(--color-gray-800);
  font-weight: 600;
}
.horizontal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.5rem;
  align-items: baseline;
  margin: 0.6rem 0;
}
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.2rem 1.5rem;
  margin: 1.2rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
code:not(.code-bar) {
  font-family: var(--font-mono);
  background: var(--color-gray-100);
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.9em;
  color: var(--color-gray-800);
}
blockquote {
  margin: 1rem 0;
  padding: 0.6rem 1.2rem;
  border-left: 4px solid var(--color-primary-light);
  background: var(--color-gray-50);
  border-radius: 0 0.5rem 0.5rem 0;
  color: var(--color-gray-700);
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.8rem;
  text-align: left;
}
th {
  background: var(--color-gray-100);
  font-weight: 600;
}
img {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
}
.btn {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  background: var(--color-primary);
  color: white;
  border-radius: 0.4rem;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}
.btn:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger  { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-info    { color: var(--color-info); }
.text-gray    { color: var(--color-gray-600); }
.text-muted   { color: var(--color-gray-500); }
.bg-primary { background: var(--color-primary-bg); }
.bg-success { background: var(--color-success-bg); }
.bg-danger  { background: var(--color-danger-bg); }
.bg-warning { background: var(--color-warning-bg); }
.bg-info    { background: var(--color-info-bg); }
.bg-gray    { background: var(--color-gray-100); }
.border-primary { border-color: var(--color-primary); }
.border-success { border-color: var(--color-success); }
.border-danger  { border-color: var(--color-danger); }
.border-warning { border-color: var(--color-warning); }
.border-info    { border-color: var(--color-info); }
@media (max-width: 640px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }
  h3 { font-size: 1.2rem; }
  .code-bar { font-size: 0.8rem; padding: 0.8rem; }
}