:root {
  --font-display: "Syne", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-editorial: "Newsreader", Georgia, serif;
  --font-body:
    "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  --max-width: 1080px;
  --content-width: 760px;
}

[data-theme="dark"] {
  --bg-base: #0a0b0e;
  --bg-surface: #111317;
  --bg-surface-hover: #171a21;
  --bg-surface-elevated: #1e222b;
  --bg-glass: rgba(17, 19, 23, 0.75);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-highlight: rgba(0, 229, 255, 0.35);

  --text-primary: #f3f4f6;
  --text-secondary: #9da4b0;
  --text-muted: #646c7c;
  --text-inverse: #0a0b0e;

  --accent-cyan: #00e5ff;
  --accent-cyan-subtle: rgba(0, 229, 255, 0.12);
  --accent-amber: #fbbf24;
  --accent-amber-subtle: rgba(251, 191, 36, 0.12);
  --accent-green: #10b981;
  --accent-green-subtle: rgba(16, 185, 129, 0.12);

  --glow-spotlight: radial-gradient(
    circle at 50% -10%,
    rgba(0, 229, 255, 0.07) 0%,
    transparent 60%
  );
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
  --card-shadow-hover:
    0 12px 30px -4px rgba(0, 229, 255, 0.12), 0 4px 20px -2px rgba(0, 0, 0, 0.6);
}

[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f1f5f9;
  --bg-surface-elevated: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.85);

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.15);
  --border-highlight: rgba(2, 132, 199, 0.4);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --accent-cyan: #0284c7;
  --accent-cyan-subtle: rgba(2, 132, 199, 0.1);
  --accent-amber: #d97706;
  --accent-amber-subtle: rgba(217, 119, 6, 0.1);
  --accent-green: #059669;
  --accent-green-subtle: rgba(5, 150, 105, 0.1);

  --glow-spotlight: radial-gradient(
    circle at 50% -10%,
    rgba(2, 132, 199, 0.06) 0%,
    transparent 60%
  );
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
  --card-shadow-hover:
    0 12px 30px -4px rgba(2, 132, 199, 0.1), 0 4px 16px -2px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
}

body {
  min-height: 100vh;
  background-color: var(--bg-base);
  background-image:
    var(--glow-spotlight),
    radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size:
    100% 100%,
    28px 28px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition:
    background-color var(--transition-base),
    color var(--transition-base);
}

/* Disable theme transition on initial page load to prevent any flash on navigation */
html.no-theme-transition,
html.no-theme-transition * {
  transition: none !important;
}

/* Reading Progress Bar (for single posts) */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-amber));
  width: 0%;
  z-index: 100;
  transition: width 0.1s ease-out;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 2.5rem);
  max-width: var(--max-width);
  z-index: 50;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--card-shadow);
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.nav-container {
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}

.brand-logo:hover {
  opacity: 0.85;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
}

.brand-meta {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.05rem;
  line-height: 1.2;
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  padding: 0;
  flex-shrink: 0;
}

.mobile-menu-btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-medium);
}

.hamburger-icon {
  display: block;
  width: 20px;
  height: 20px;
  overflow: visible;
}

.ham-line {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast);
}

.mobile-menu-btn.active .ham-line-top {
  transform: translateY(5px) rotate(45deg);
}

.mobile-menu-btn.active .ham-line-mid {
  opacity: 0;
}

.mobile-menu-btn.active .ham-line-bottom {
  transform: translateY(-5px) rotate(-45deg);
}

/* Mobile Navigation Backdrop & Drawer */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-nav-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 340px);
  background: var(--bg-surface);
  border-left: 1px solid var(--border-medium);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.4);
  z-index: 100;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  overflow-y: auto;
}

.mobile-nav-drawer.open {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}

.mobile-drawer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  font-weight: 600;
}

.mobile-drawer-close-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.mobile-drawer-close-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.mobile-nav-body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  gap: 2rem;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.mobile-nav-link .nav-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
}

.mobile-nav-link.active .nav-idx,
.mobile-nav-link:hover .nav-idx {
  color: var(--accent-cyan);
}

.mobile-drawer-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-drawer-subtitle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.mobile-social-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.mobile-social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-social-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
}

body.menu-open {
  overflow: hidden;
}

/* Main Container */
#app {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: calc(4.5rem + 2.5rem) 1.5rem 4rem;
}

/* Common Components & Helpers */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  width: fit-content;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* Typography Classes */
.font-display {
  font-family: var(--font-display);
}
.font-editorial {
  font-family: var(--font-editorial);
  font-style: italic;
}
.font-mono {
  font-family: var(--font-mono);
}

.section-header {
  margin-bottom: 2rem;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-eyebrow::before {
  content: "//";
  color: var(--text-muted);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.2;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 0.5rem;
  max-width: 600px;
}

/* Standard Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition:
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--card-shadow-hover);
}

.card-interactive {
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-interactive:hover {
  transform: translateY(-3px);
  border-color: var(--border-highlight);
}

/* Tag / Chip */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.tag:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.tag-cyan {
  background: var(--accent-cyan-subtle);
  color: var(--accent-cyan);
  border-color: rgba(0, 229, 255, 0.2);
}

.tag-amber {
  background: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border-color: rgba(251, 191, 36, 0.2);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--text-primary);
  color: var(--text-inverse);
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

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

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background: var(--bg-surface);
}

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.project-link-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-subtle);
  transform: translateY(-1px);
}

/* Toast Notification */
#toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-highlight);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  z-index: 100;
  transform: translateY(100px);
  opacity: 0;
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Site Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: 3.5rem 1.5rem 2.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 380px;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col a,
.footer-col .footer-link-btn {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
}

.footer-col a:hover,
.footer-col .footer-link-btn:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-bottom-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-bottom-right {
  display: flex;
  align-items: center;
}

.footer-stack-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.footer-theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.footer-theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: var(--bg-surface-hover);
  transform: translateY(-1px);
}

.theme-toggle-icon {
  display: flex;
  align-items: center;
  color: var(--accent-cyan);
}

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    top: 0.75rem;
    width: calc(100% - 1.5rem);
  }
  .nav-container {
    padding: 0.65rem 1rem;
  }
  .desktop-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .brand-role {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .footer-bottom-left {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .section-title {
    font-size: 1.65rem;
  }
  #app {
    padding: calc(3.5rem + 1.5rem) 1rem 3rem;
  }
}

/* Syntax Highlighting (speed-highlight token theme) */
.shj-syn-kwd {
  color: var(--accent-cyan);
  font-weight: 600;
}
.shj-syn-str {
  color: var(--accent-green);
}
.shj-syn-cmnt {
  color: var(--text-muted);
  font-style: italic;
}
.shj-syn-num {
  color: var(--accent-amber);
}
.shj-syn-func {
  color: var(--accent-cyan);
}
.shj-syn-class {
  color: var(--accent-amber);
}
.shj-syn-var {
  color: var(--text-primary);
}
.shj-syn-oper {
  color: var(--text-secondary);
}
.shj-syn-bool {
  color: var(--accent-amber);
}
.shj-syn-type {
  color: var(--accent-amber);
}
.shj-syn-esc {
  color: var(--accent-green);
}
.shj-syn-section {
  color: var(--accent-cyan);
  font-weight: 600;
}
.shj-syn-insert {
  color: var(--accent-green);
}
.shj-syn-deleted {
  color: #f87171;
}
.shj-syn-err {
  color: #f87171;
}