:root {
  --color-primary: #1a1a1a;
  --color-secondary: #4a4a4a;
  --color-tertiary: #8a8a8a;
  --color-quaternary: #c4c4c4;
  --bg-primary: #fff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --bg-hover: #f0f0f0;
  --accent-primary: #2c2c2c;
  --accent-secondary: #6c6c6c;
  --accent-subtle: rgba(0,0,0,0.05);
  --color-link: #1a1a1a;
  --color-link-hover: #4a4a4a;
  --color-border: #e8e8e8;
  --color-shadow: rgba(0,0,0,0.08);
  --font-serif: 'Crimson Pro', 'Source Serif Pro', 'Times New Roman', 'Noto Serif SC', 'Source Han Serif SC', STSong, serif;
  --font-sans: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;
  --font-size-xs: 1.2rem;
  --font-size-sm: 1.4rem;
  --font-size-base: 1.8rem;
  --font-size-lg: 2.8rem;
  --font-size-xl: 3.6rem;
  --font-size-2xl: 4.8rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --spacing-0: 0;
  --spacing-1: 0.4rem;
  --spacing-2: 0.8rem;
  --spacing-3: 1.2rem;
  --spacing-4: 1.6rem;
  --spacing-5: 2rem;
  --spacing-6: 2.4rem;
  --spacing-8: 3.2rem;
  --spacing-10: 4rem;
  --spacing-12: 4.8rem;
  --spacing-16: 6.4rem;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.03), 0 1px 3px 0 rgba(0,0,0,0.02);
  --shadow-md: 0 2px 4px -1px rgba(0,0,0,0.04), 0 4px 6px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 8px -2px rgba(0,0,0,0.05), 0 8px 16px -2px rgba(0,0,0,0.08);
  --shadow-xl: 0 8px 16px -4px rgba(0,0,0,0.08), 0 16px 32px -4px rgba(0,0,0,0.12);
  --shadow-2xl: 0 16px 32px -8px rgba(0,0,0,0.12), 0 32px 64px -8px rgba(0,0,0,0.16);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-subtle: linear-gradient(135deg, #fafafa 0%, #fff 100%);
  --gradient-card: linear-gradient(to bottom, #fff 0%, #fafafa 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.8) 100%);
}
[data-theme="dark"] {
  --color-primary: #e8e8e8;
  --color-secondary: #b8b8b8;
  --color-tertiary: #888;
  --color-quaternary: #444;
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #242424;
  --bg-hover: #2a2a2a;
  --accent-primary: #f5f5f5;
  --accent-secondary: #a8a8a8;
  --accent-subtle: rgba(255,255,255,0.05);
  --color-link: #e8e8e8;
  --color-link-hover: #fff;
  --color-border: #2a2a2a;
  --color-shadow: rgba(0,0,0,0.3);
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.2), 0 1px 3px 0 rgba(0,0,0,0.15);
  --shadow-md: 0 2px 4px -1px rgba(0,0,0,0.3), 0 4px 6px -1px rgba(0,0,0,0.2);
  --shadow-lg: 0 4px 8px -2px rgba(0,0,0,0.4), 0 8px 16px -2px rgba(0,0,0,0.3);
  --shadow-xl: 0 8px 16px -4px rgba(0,0,0,0.5), 0 16px 32px -4px rgba(0,0,0,0.4);
  --shadow-2xl: 0 16px 32px -8px rgba(0,0,0,0.6), 0 32px 64px -8px rgba(0,0,0,0.5);
  --gradient-subtle: linear-gradient(135deg, #1a1a1a 0%, #0f0f0f 100%);
  --gradient-card: linear-gradient(to bottom, #242424 0%, #1a1a1a 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.8) 100%);
}
html {
  transition: background-color var(--transition-slow), color var(--transition-slow);
  scroll-behavior: smooth;
}
body {
  background: var(--bg-primary);
  color: var(--color-primary);
  font-family: var(--font-serif);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}
a {
  color: var(--color-link);
  transition: color var(--transition-base);
}
a:hover {
  color: var(--color-link-hover);
}
h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}
h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  color: var(--color-primary);
}
p,
li {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--color-primary);
}
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin: 0 1.2rem;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-base);
  vertical-align: middle;
}
.theme-toggle:hover {
  transform: scale(1.1) rotate(10deg);
}
.theme-toggle:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}
.theme-toggle .theme-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.8rem;
  color: var(--color-secondary);
  transition: color var(--transition-base), opacity var(--transition-base);
}
.theme-toggle .theme-icon:hover {
  color: var(--color-primary);
}
.theme-toggle .theme-icon-dark {
  display: none;
}
.page {
  background: var(--bg-primary);
  color: var(--color-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-slow);
}
.side-card {
  background: var(--bg-tertiary);
  transition: background-color var(--transition-slow), color var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-slow);
}
#page_header,
#page_footer {
  background: var(--bg-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow);
}
blockquote {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--spacing-4) var(--spacing-6);
  margin: var(--spacing-6) 0;
  color: var(--color-secondary);
  font-style: italic;
  position: relative;
  transition: background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow);
}
blockquote::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 10px;
  font-size: 4rem;
  color: var(--color-quaternary);
  opacity: 0.3;
  font-family: Georgia, serif;
}
.highlight,
pre,
code {
  background: var(--bg-secondary);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow);
}
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb {
  background: var(--color-quaternary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-base);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-tertiary);
}
@media (max-width: 768px) {
  :root {
    --font-size-xs: 1.1rem;
    --font-size-sm: 1.3rem;
    --font-size-base: 1.6rem;
    --font-size-lg: 2.2rem;
    --font-size-xl: 2.8rem;
    --font-size-2xl: 3.6rem;
  }
  html {
    font-size: 58.5%;
  }
}
@media (min-width: 1440px) {
  :root {
    --font-size-base: 1.9rem;
    --font-size-lg: 2.6rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
.menus_items li a {
  font-weight: 400;
  transition: font-weight var(--transition-fast), color var(--transition-base), transform var(--transition-base);
  display: inline-block;
}
.menus_items li a:hover {
  font-weight: 500;
  transform: translateY(-1px);
}
.menus_items li a::before {
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
}
.page {
  transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow);
}
.page:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.side-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base), background-color var(--transition-slow), color var(--transition-slow);
}
.side-card:hover {
  transform: translateY(-1px);
  opacity: 1 !important;
  box-shadow: var(--shadow-md);
}
.author-avatar {
  overflow: hidden;
  border-radius: var(--radius-full);
}
.author-avatar img {
  transition: transform var(--transition-slow), filter var(--transition-slow);
  display: block;
  width: 100%;
  height: 100%;
}
.author-avatar img:hover {
  transform: scale(1.08) rotate(2deg);
  filter: brightness(1.05) contrast(1.05);
}
.social-icons a {
  transition: transform var(--transition-base), color var(--transition-base);
  display: inline-block;
  transform-style: preserve-3d;
}
.social-icons a:hover {
  transform: rotateY(360deg) scale(1.2);
  color: var(--accent-primary);
}
.social-icons .fa,
.social-icons .fas,
.social-icons .fab {
  transition: transform var(--transition-base), color var(--transition-base);
  display: inline-block;
}
.social-icons .fa:hover,
.social-icons .fas:hover,
.social-icons .fab:hover {
  color: var(--accent-primary);
}
.btn,
button {
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}
.btn::before,
button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}
.btn:hover::before,
button:hover::before {
  width: 300px;
  height: 300px;
}
.btn:hover,
button:hover {
  transform: translateY(-1px);
}
#page_header {
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0s;
}
.side-card {
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.1s;
}
.page {
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.2s;
}
#page_footer {
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.3s;
}
.cd-top {
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.cd-top:hover i {
  animation: bounce 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}
.page article a {
  position: relative;
  text-decoration: none;
  background-image: linear-gradient(to right, var(--color-link) 0%, var(--color-link) 100%);
  background-size: 0 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.3s cubic-bezier(0.4, 0, 0.2, 1), color var(--transition-base);
}
.page article a:hover {
  background-size: 100% 1px;
  color: var(--color-link-hover);
}
h1 a,
h2 a,
h3 a,
h4 a {
  transition: color var(--transition-base), transform var(--transition-base);
  display: inline-block;
}
h1 a:hover,
h2 a:hover,
h3 a:hover,
h4 a:hover {
  color: var(--accent-primary);
  transform: translateX(4px);
}
li {
  transition: transform var(--transition-fast), color var(--transition-base);
}
li:hover {
  transform: translateX(2px);
}
@media (max-width: 768px) {
  .social-icons a:hover {
    transform: scale(1.1);
  }
  .author-avatar img:hover {
    transform: scale(1.05);
  }
}
.page {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
}
.side-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.highlight {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.btn {
  border-radius: var(--radius-sm);
  padding: var(--spacing-3) var(--spacing-6);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-sm);
}
.btn:hover {
  box-shadow: var(--shadow-md);
}
input,
textarea {
  background: var(--bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  transition: border-color var(--transition-base), background-color var(--transition-slow);
}
input:focus,
textarea:focus {
  border-color: var(--accent-primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-subtle);
}
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--bg-primary);
}
table th,
table td {
  border: 1px solid var(--color-border);
  padding: var(--spacing-3) var(--spacing-4);
  transition: background-color var(--transition-base);
}
table th {
  background: var(--bg-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}
table tr:hover {
  background: var(--bg-hover);
}
hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
  margin: var(--spacing-8) 0;
}
@-moz-keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@-webkit-keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@-o-keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@-moz-keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}
@-webkit-keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}
@-o-keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}