:root {
  --bg-primary: #0c0c0c;
  --bg-secondary: #161616;
  --bg-tertiary: #1e1e1e;
  --text-primary: #d4d4d4;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --accent: #f97316;
  --accent-hover: #fb923c;
  --accent-dim: rgba(249, 115, 22, 0.12);
  --border: #262626;
  --glow: radial-gradient(ellipse at 50% 0%, rgba(249, 115, 22, 0.06) 0%, transparent 70%);

  --font-body: 'Atkinson Hyperlegible', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --max-width: 720px;
  --content-width: 100%;
}

[data-theme="light"] {
  --bg-primary: #f5f0eb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8e4df;
  --text-primary: #1a1a1a;
  --text-secondary: #555555;
  --text-muted: #999999;
  --accent: #ea580c;
  --accent-hover: #c2410c;
  --accent-dim: rgba(234, 88, 12, 0.08);
  --border: #d4d0cb;
  --glow: radial-gradient(ellipse at 50% 0%, rgba(234, 88, 12, 0.04) 0%, transparent 70%);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  background-image: var(--glow);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

h1 { font-size: 2.25rem; margin-bottom: 0.5rem; }
h2 { font-size: 1.75rem; margin-top: 2rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.25rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
h4 { font-size: 1.125rem; margin-top: 1.25rem; margin-bottom: 0.5rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
}

strong, b { font-weight: 700; }
em, i { font-style: italic; }

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.15em 0.35em;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
}

pre {
  padding: 1.25rem;
  border-radius: 8px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

ul, ol {
  margin: 0.5rem 0 1rem 1.5rem;
}

li {
  margin-bottom: 0.25rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  background-color: var(--bg-primary);
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

header .site-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

header .site-name:hover {
  color: var(--accent);
}

header nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

header nav a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.5rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  border-radius: 6px;
  transition: color 0.15s ease, background-color 0.15s ease;
}

header nav a:hover {
  color: var(--accent);
  background-color: var(--accent-dim);
}

header nav a svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  header nav a:not([aria-label]) span {
    display: none;
  }
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 0.25rem;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background-color: var(--accent-dim);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Main Content */
main {
  padding: 3rem 0;
  min-height: calc(100vh - 64px - 80px);
}

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8125rem;
  border-top: 1px solid var(--border);
  transition: border-color 0.3s ease;
}

/* Homepage */
.terminal-prompt {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 2rem;
  min-height: 3rem;
}

.terminal-prompt .prompt-sign {
  user-select: none;
  margin-right: 0.5rem;
}

.terminal-prompt .cursor {
  animation: blink 1s step-end infinite;
  font-weight: 400;
}

@keyframes blink {
  50% { opacity: 0; }
}

.intro {
  margin-bottom: 2.5rem;
}

.intro p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
}

.home-section {
  margin-top: 2.5rem;
}

.home-section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--accent);
}

.project h3 {
  margin-top: 0;
}

.project h3 a {
  color: var(--text-primary);
}

.project h3 a:hover {
  color: var(--accent);
}

.project-dates {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
}

/* Page Content */
.page-content {
  max-width: var(--max-width);
}

.page-content h1 {
  margin-bottom: 0.25rem;
}

.page-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-family: var(--font-mono);
}

.content-body {
  color: var(--text-secondary);
  line-height: 1.8;
}

.content-body h2 {
  margin-top: 2.5rem;
  color: var(--text-primary);
}

.content-body h3 {
  color: var(--text-primary);
  margin-top: 2rem;
}



/* Blog List */
.post-list {
  list-style: none;
  margin: 2rem 0;
}

.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list li:first-child {
  padding-top: 0;
}

.post-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.post-title:hover {
  color: var(--accent);
}

.post-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  font-family: var(--font-mono);
}

.post-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* Blog Single */
.post-header {
  margin-bottom: 2.5rem;
}

.post-header h1 {
  margin-bottom: 0.75rem;
}

.post-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--font-mono);
}

.post-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  color: var(--accent);
  font-size: 0.8125rem;
}

.tag:hover {
  color: var(--accent-hover);
}

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

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  .terminal-prompt { font-size: 1.75rem; }
  main { padding: 2rem 0; }
  header { padding: 0 1rem; }
  header nav { gap: 0; }
  header nav a { padding: 0.35rem; }
  .container { padding: 0 1rem; }

  dl dd { margin-left: 0; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.5rem; }
  .terminal-prompt { font-size: 1.375rem; }
}