/* ==========================================
   CSS CUSTOM PROPERTIES
   ========================================== */
:root {
  /* Base color palette */
  --rgb-almost-black: 35, 28, 51;
  --rgb-almost-white: 236, 233, 230;
  --rgb-white: 255, 255, 255;
  --rgb-blue: 0, 116, 228;
  --rgb-gray: 116, 116, 128;
  --rgb-medium-gray: 226, 221, 215;
  --rgb-light-gray: 251, 250, 249;
  /* Light theme semantic mapping */
  --rgb-background: var(--rgb-white);
  --rgb-text: var(--rgb-almost-black);
  --rgb-border: var(--rgb-medium-gray);
  --rgb-surface: var(--rgb-light-gray);
  /* Functional color variables */
  --color-bg: rgb(var(--rgb-background));
  --color-text: rgb(var(--rgb-text));
  --color-text-subtle: rgba(var(--rgb-text), 0.66);
  --color-link: rgb(var(--rgb-blue));
  --color-border: rgba(var(--rgb-text), 0.15);
  --color-surface: rgb(var(--rgb-surface));
  --color-shadow: rgba(var(--rgb-medium-gray), 0.3);
  /* Typography scale */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  --line-height-tight: 1.2;
  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  /* Border radius */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 50%;
  /* Transitions */
  --transition-fast: 0.2s ease;
}

/* ==========================================
   DARK/LIGHT THEME
   ========================================== */
:root[data-color-scheme="dark"],
:root:not([data-color-scheme="light"]) {
  --rgb-almost-black: 27, 39, 51;
  --rgb-blue: 80, 162, 255;
  --rgb-yellow: 255, 214, 102;
  --rgb-medium-gray: 51, 60, 71;
  --rgb-light-gray: 39, 50, 62;
  --rgb-background: var(--rgb-almost-black);
  --rgb-text: var(--rgb-almost-white);
  --rgb-border: var(--rgb-medium-gray);
  --rgb-surface: var(--rgb-light-gray);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-link: rgb(var(--rgb-yellow));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-color-scheme="light"]) {
    --rgb-almost-black: 27, 39, 51;
    --rgb-blue: 80, 162, 255;
    --rgb-yellow: 255, 214, 102;
    --rgb-medium-gray: 51, 60, 71;
    --rgb-light-gray: 39, 50, 62;
    --rgb-background: var(--rgb-almost-black);
    --rgb-text: var(--rgb-almost-white);
    --rgb-border: var(--rgb-medium-gray);
    --rgb-surface: var(--rgb-light-gray);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-link: rgb(var(--rgb-yellow));
  }
}

.theme-toggle .theme-icon-sun {
  display: none;
}
.theme-toggle .theme-icon-moon {
  display: block;
}
[data-color-scheme="dark"] .theme-toggle .theme-icon-sun {
  display: block;
}
[data-color-scheme="dark"] .theme-toggle .theme-icon-moon {
  display: none;
}
.theme-toggle svg {
  width: 20px;
  height: 20px;
  display: block;
}

/* ==========================================
   BASE STYLES
   ========================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scrollbar-gutter: stable;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
}

body {
  margin: 0;
  padding: var(--space-lg);
  background-color: var(--color-bg);
  color: var(--color-text);
  max-width: 700px;
  margin-inline: auto;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h1 {
  font-size: 2.5rem;
  margin-top: 0;
}

h2 {
  font-size: 1.8rem;
}

h3 {
  font-size: 1.4rem;
}

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: text-decoration var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

/* ==========================================
   COMPONENTS
   ========================================== */
.bio {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  font-size: 1rem;
}

.bio-main {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.bio img {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
}

.bio-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.contact-links {
  display: flex;
  gap: var(--space-md);
}

.contact-links a {
  color: var(--color-text-subtle);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.contact-links a:hover {
  color: var(--color-link);
  transform: scale(1.1);
  text-decoration: none;
}

.contact-links svg {
  width: 22px;
  height: 22px;
}

.blog-summary {
  margin-bottom: var(--space-xl);
}

.blog-summary h1 {
  font-size: 1.3rem;
  color: var(--color-text-subtle);
  font-weight: 500;
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.blog-summary p {
  color: var(--color-text-subtle);
  font-size: 1.1rem;
  line-height: 1.5;
  margin-bottom: var(--space-sm);
}

.post-tile {
  display: block;
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.post-tile:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-shadow);
  text-decoration: none;
}

.post-date {
  font-size: 0.9rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-xs);
}

.post-title {
  margin: 0 0 var(--space-sm) 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.post-excerpt {
  color: var(--color-text-subtle);
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.read-more {
  color: var(--color-link);
  font-weight: 500;
}

.back-link {
  margin-bottom: var(--space-md);
}

.back-link a {
  color: var(--color-text-subtle);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.back-link a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.single-post h1 {
  margin-bottom: var(--space-xs);
}

.single-post .date {
  font-size: 0.9rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-lg);
}

.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
  z-index: 1000;
  box-shadow: 0 2px 8px var(--color-shadow);
}

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

figure {
  margin: var(--space-lg) 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

figcaption {
  margin-top: var(--space-xs);
  font-size: 0.9rem;
  color: var(--color-text-subtle);
  font-style: italic;
}

.note {
  background: var(--color-surface);
  border-left: 3px solid var(--color-link);
  padding: var(--space-sm);
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--color-text-subtle);
}

/* ==========================================
   FOOTER
   ========================================== */
.site-footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer p {
  color: var(--color-text-subtle);
  font-size: 0.9rem;
  margin: 0;
}
/* ==========================================
   CODE & TABLES
   ========================================== */
pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  overflow-x: auto;
  margin: var(--space-md) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

p code,
li code {
  background: var(--color-surface);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

th, td {
  text-align: left;
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  background: var(--color-surface);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 800px) {
  body {
    padding: var(--space-sm);
  }

  .bio {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-sm);
  }

  .bio-main {
    gap: var(--space-sm);
  }

  .bio img {
    width: 48px;
    height: 48px;
  }

  .contact-links {
    gap: var(--space-sm);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .post-title {
    font-size: 1.3rem;
  }

  .theme-toggle {
    top: var(--space-sm);
    right: var(--space-sm);
    width: 44px;
    height: 44px;
  }

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

  .post-tile {
    padding: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .bio {
    text-align: center;
    align-items: center;
  }

  .bio-main {
    flex-direction: column;
    text-align: center;
    gap: var(--space-xs);
  }

  .contact-links {
    justify-content: center;
  }

  h1 {
    font-size: 1.8rem;
  }

  .post-title {
    font-size: 1.2rem;
  }
}