/* ==========================================================================
   MODERN DEV BLOG - A theme that slaps
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Dark theme (midnight blue) */
  --bg-primary: #001535;
  --bg-secondary: #0a2244;
  --bg-tertiary: #143052;
  --bg-elevated: #1e3e61;
  --bg-hover: #284c70;

  --text-primary: #fafafa;
  --text-secondary: #e4e4e7;
  --text-tertiary: #b4b4bb;
  --text-muted: #8b8b94;

  /* The accent - electric cyan */
  --accent: #22d3ee;
  --accent-dim: #0891b2;
  --accent-glow: rgba(34, 211, 238, 0.15);
  --accent-glow-strong: rgba(34, 211, 238, 0.3);

  /* Secondary accent - warm */
  --accent-warm: #f472b6;

  /* Functional */
  --border: #1e3a5f;
  --border-subtle: #172a45;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Sizing */
  --max-width: 1200px;
  --content-width: 680px;

  /* Animation */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  /* Effects */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle dot grid overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.4;
  pointer-events: none;
  z-index: -1;
}

/* Selection */
::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

p {
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

a:hover {
  color: #67e8f9;
  text-decoration: underline;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

em {
  font-style: italic;
  color: var(--text-secondary);
}

/* Inline code */
code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--accent);
}

/* Code blocks */
pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: var(--space-2xl) 0;
  position: relative;
}

pre::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
  opacity: 0.5;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

/* Lists */
ul, ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
}

li::marker {
  color: var(--accent);
}

/* Blockquote */
blockquote {
  border-left: 2px solid var(--accent);
  padding-left: var(--space-lg);
  margin: var(--space-xl) 0;
  font-style: italic;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.content-width {
  max-width: var(--content-width);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 21, 53, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: var(--space-md) 0;
}

/* Navigation - Command bar style */
.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: var(--space-xs) var(--space-sm);
  margin: 0 auto;
  width: fit-content;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s var(--ease-out);
}

.nav__link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav__link--active {
  color: var(--bg-primary);
  background: var(--accent);
}

.nav__link--active:hover {
  color: var(--bg-primary);
  background: var(--accent);
}

.nav__divider {
  width: 1px;
  height: 24px;
  background: var(--border);
}

/* Logo in nav */
.nav__logo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  margin-right: var(--space-xs);
  border: 2px solid var(--accent-dim);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  position: relative;
}

.hero__grid {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.hero__content {
  max-width: 700px;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeIn 0.6s var(--ease-out) 0.1s forwards;
}

.hero__label::before {
  content: '>';
  opacity: 0.5;
}

.hero__title {
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeIn 0.6s var(--ease-out) 0.2s forwards;
}

/* Accent text effect */
.gradient {
  color: var(--accent);
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  opacity: 0;
  animation: fadeIn 0.6s var(--ease-out) 0.3s forwards;
  margin-bottom: 0;
}

/* Signup Card - positioned outside content to the right */
.signup-card {
  position: absolute;
  top: calc(var(--space-xl) + 1.5rem);
  left: calc(100% + var(--space-xl));
  width: 280px;
  opacity: 0;
  animation: fadeIn 0.6s var(--ease-out) 0.4s forwards;
}

@media (max-width: 1280px) {
  .signup-card {
    position: static;
    width: 100%;
    margin-top: var(--space-2xl);
  }
}

.signup-card__glow {
  position: absolute;
  inset: -1px;
  background: linear-gradient(to bottom, rgba(34, 211, 238, 0.2), rgba(168, 85, 247, 0.2));
  border-radius: var(--radius-xl);
  filter: blur(8px);
  opacity: 0.5;
  transition: opacity 0.3s var(--ease-out);
}

.signup-card:hover .signup-card__glow {
  opacity: 0.7;
}

.signup-card__inner {
  position: relative;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
}

.signup-card__badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.signup-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

.signup-card__badge span:last-child {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.signup-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.signup-card__desc {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.signup-card__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.signup-card__input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: all 0.2s var(--ease-out);
}

.signup-card__input::placeholder {
  color: var(--text-muted);
}

.signup-card__input:focus {
  outline: none;
  border-color: var(--accent);
}

.signup-card__button {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
}

.signup-card__button:hover {
  filter: brightness(1.1);
}

.signup-card__note {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
  margin-bottom: 0;
  text-align: center;
}

/* Animated cursor */
.cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

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

/* --------------------------------------------------------------------------
   Articles List
   -------------------------------------------------------------------------- */
.articles {
  padding: 0 var(--space-lg) var(--space-3xl);
  max-width: 700px;
  margin: 0 auto;
}

.articles__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.articles__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
}

.articles__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Article card */
.article-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  margin: 0 calc(-1 * var(--space-lg));
  border-radius: var(--radius-lg);
  transition: all 0.3s var(--ease-out);
  position: relative;
  text-decoration: none;
}

.article-card:hover {
  background: var(--bg-secondary);
  transform: translateX(8px);
  text-decoration: none;
}

.article-card__content {
  min-width: 0;
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.article-card__category {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-card__series {
  color: var(--accent);
  background: var(--accent-glow);
  padding: 3px var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

/* Desktop: show in meta line, hide bottom */
.article-card__series--desktop {
  display: inline-block;
}

.article-card__series--mobile {
  display: none;
}

/* Mobile: hide meta line, show at bottom */
@media (max-width: 640px) {
  .article-card__series--desktop {
    display: none;
  }

  .article-card__series--mobile {
    display: inline-block;
    margin-top: var(--space-sm);
    float: right;
  }
}

.article-card__title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 4px 0;
  color: var(--text-primary);
  transition: color 0.2s var(--ease-out);
}

.article-card:hover .article-card__title {
  color: var(--accent);
}

.article-card__excerpt {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin: 0;
}

.article-card__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  transition: all 0.3s var(--ease-out);
  align-self: center;
  flex-shrink: 0;
  margin-left: auto;
}

.article-card:hover .article-card__arrow {
  border-color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   Post Hero
   -------------------------------------------------------------------------- */
.post-hero {
  position: relative;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.post-hero__bg {
  position: absolute;
  inset: 0;
  left: calc(-50vw + 50%);
  right: calc(-50vw + 50%);
  background: linear-gradient(to bottom, rgba(34, 211, 238, 0.08), rgba(168, 85, 247, 0.04), transparent);
  pointer-events: none;
}

.post-hero__glow {
  position: absolute;
  top: -100px;
  left: calc(-50vw + 50%);
  right: calc(-50vw + 50%);
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.15), transparent 70%);
  pointer-events: none;
}

.post-hero__container {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.post-hero__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  transition: color 0.2s var(--ease-out);
}

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

.post-hero__back:hover svg {
  transform: translateX(-4px);
}

.post-hero__back svg {
  transition: transform 0.2s var(--ease-out);
}

.post-hero__grid {
  position: relative;
}

.post-hero__content {
  max-width: 700px;
}

/* Card positioned outside content to the right */
.post-hero__sidebar {
  position: absolute;
  top: 0;
  left: calc(100% + var(--space-xl));
  width: 280px;
}

@media (max-width: 1200px) {
  .post-hero__sidebar {
    position: static;
    width: 100%;
    margin-top: var(--space-xl);
  }
}

.post-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.post-hero__category {
  padding: var(--space-xs) var(--space-md);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-hero__date,
.post-hero__read {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.post-hero__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
}

.post-hero__title em {
  color: var(--accent);
  font-style: normal;
}

.post-hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-tertiary);
  line-height: 1.7;
  margin: 0;
}

/* Project Info Card */
.project-card {
  position: relative;
}

.project-card__glow {
  position: absolute;
  inset: -1px;
  background: linear-gradient(to bottom, rgba(34, 211, 238, 0.2), rgba(168, 85, 247, 0.2));
  border-radius: var(--radius-xl);
  filter: blur(8px);
  opacity: 0.5;
  transition: opacity 0.3s var(--ease-out);
}

.project-card:hover .project-card__glow {
  opacity: 0.7;
}

.project-card__inner {
  position: relative;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
}

.project-card__badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.project-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse 2s ease-in-out infinite;
}

.project-card__badge span:last-child {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-card__list {
  display: grid;
  gap: var(--space-md);
}

.project-card__item {
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.project-card__item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.project-card__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0 0 4px 0;
}

.project-card__value {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.project-card__value .highlight {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   Series Card (Sidebar TOC)
   -------------------------------------------------------------------------- */
.series-card {
  position: relative;
}

.series-card__glow {
  position: absolute;
  inset: -1px;
  background: linear-gradient(to bottom, rgba(34, 211, 238, 0.2), rgba(168, 85, 247, 0.2));
  border-radius: var(--radius-xl);
  filter: blur(8px);
  opacity: 0.5;
  transition: opacity 0.3s var(--ease-out);
}

.series-card:hover .series-card__glow {
  opacity: 0.7;
}

.series-card__inner {
  position: relative;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
}

.series-card__badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.series-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

.series-card__badge span:last-child {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.series-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.series-card__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  transition: background 0.2s var(--ease-out);
}

.series-card__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--bg-tertiary);
  border-radius: 50%;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 1px;
}

/* Published articles */
.series-card__item--published .series-card__number {
  background: var(--accent-glow);
  color: var(--accent);
}

.series-card__link {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.4;
  transition: color 0.2s var(--ease-out);
}

.series-card__item--published:hover {
  background: var(--bg-tertiary);
}

.series-card__item--published:hover .series-card__link {
  color: var(--accent);
}

/* Current article */
.series-card__item--current {
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
}

.series-card__item--current .series-card__number {
  background: var(--accent);
  color: var(--bg-primary);
}

.series-card__current {
  font-size: 0.8125rem;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.4;
}

/* Upcoming articles */
.series-card__item--upcoming {
  opacity: 1;
}

.series-card__upcoming {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.series-card__soon {
  font-size: 0.4rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: #22d3ee;
  background: rgba(34, 211, 238, 0.15);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  vertical-align: super;
  margin-left: 1px;
}

/* --------------------------------------------------------------------------
   Post Content
   -------------------------------------------------------------------------- */
.post-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-lg) 0;
}

/* Section headers with numbers */
.post-content__main h2 {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  counter-increment: section;
}

.post-content__main h2:first-of-type {
  margin-top: 0;
}

.post-content__main h2::before {
  content: counter(section, decimal-leading-zero);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  flex-shrink: 0;
}

.post-content__main {
  counter-reset: section;
}


/* Stats box */
.stats-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl) 0;
  margin: var(--space-2xl) 0;
}

.stats-box__item {
  text-align: center;
  padding: 0;
}

.stats-box__item:not(:last-child) {
  border-right: 1px solid var(--border);
}

.stats-box__value {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 var(--space-xs) 0;
}

.stats-box__value--cyan {
  background: linear-gradient(135deg, var(--accent), #67e8f9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-box__value--purple {
  background: linear-gradient(135deg, #a855f7, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-box__value--pink {
  background: linear-gradient(135deg, var(--accent-warm), #f9a8d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-box__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 0;
}

@media (max-width: 500px) {
  .stats-box {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .stats-box__item:not(:last-child) {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-lg);
  }
}

/* Code blocks with window chrome */
.post-content__main pre {
  position: relative;
  padding-top: calc(var(--space-lg) + 2rem);
}

.post-content__main pre::before {
  content: '';
  position: absolute;
  top: var(--space-md);
  left: var(--space-lg);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 18px 0 0 #eab308, 36px 0 0 #22c55e;
}

.post-content__main pre::after {
  content: attr(data-filename);
  position: absolute;
  top: var(--space-md);
  left: calc(var(--space-lg) + 60px);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Tables */
.post-content__main table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 0.875rem;
}

.post-content__main th,
.post-content__main td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border);
}

.post-content__main th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.post-content__main tr:nth-child(even) {
  background: var(--bg-secondary);
}

.post-content__main tr:hover {
  background: var(--bg-tertiary);
}

/* --------------------------------------------------------------------------
   Post CTA
   -------------------------------------------------------------------------- */
.post-cta {
  border-top: 1px solid var(--border);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.post-cta__content {
  max-width: 500px;
  margin: 0 auto;
}

.post-cta__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.post-cta__desc {
  font-size: 0.9375rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-lg);
}

.post-cta__form {
  display: flex;
  gap: var(--space-sm);
}

.post-cta__input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: all 0.2s var(--ease-out);
}

.post-cta__input::placeholder {
  color: var(--text-muted);
}

.post-cta__input:focus {
  outline: none;
  border-color: var(--accent);
}

.post-cta__button {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
}

.post-cta__button:hover {
  filter: brightness(1.1);
}

@media (max-width: 500px) {
  .post-cta__form {
    flex-direction: column;
  }
}

/* Info box */
.info-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
}

.info-box p {
  margin-bottom: var(--space-sm);
}

.info-box p:last-child {
  margin-bottom: 0;
}

.info-box-with-image {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
  margin: var(--space-xl) 0;
}

.info-box-with-image .info-box {
  flex: 1;
  margin: 0;
}

.info-box-with-image img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

/* Callout */
.callout {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
}

.callout p {
  color: var(--text-primary);
}

.callout p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Newsletter Signup
   -------------------------------------------------------------------------- */
.newsletter {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent-warm);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-3xl);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.newsletter--sidebar {
  margin-top: var(--space-md);
  padding: var(--space-md);
}

.newsletter__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  margin-bottom: var(--space-xs);
}

.newsletter__description {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.newsletter__form {
  display: flex;
  gap: var(--space-sm);
}

.newsletter__input {
  flex: 1;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: border-color 0.2s var(--ease-out);
}

.newsletter__input::placeholder {
  color: var(--text-muted);
}

.newsletter__input:focus {
  outline: none;
  border-color: var(--accent);
}

.newsletter__button {
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
}

.newsletter__button:hover {
  background: var(--text-primary);
  transform: translateY(-1px);
}

/* Sidebar newsletter - stacked layout */
.newsletter--sidebar .newsletter__form {
  flex-direction: column;
}

.newsletter--sidebar .newsletter__button {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Subscribed Page
   -------------------------------------------------------------------------- */
.subscribed {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
}

.subscribed__content {
  max-width: 500px;
}

.subscribed__label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: var(--space-lg);
}

.subscribed__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-lg);
}

.subscribed__message {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.subscribed__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-tertiary);
  transition: color 0.2s var(--ease-out);
}

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

.subscribed__back svg {
  transition: transform 0.2s var(--ease-out);
}

.subscribed__back:hover svg {
  transform: translateX(-4px);
}

/* --------------------------------------------------------------------------
   Reading Progress
   -------------------------------------------------------------------------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--border);
  z-index: 200;
}

.reading-progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  width: 0%;
  transition: width 0.1s linear;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-4xl);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer__text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-sm);
}

.footer__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  transition: all 0.2s var(--ease-out);
}

.footer__link:hover {
  background: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-2px);
}

.footer__link svg {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   Utilities & Accessibility
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link - visible on focus for keyboard users */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  background: var(--accent);
  color: var(--bg-primary);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus {
  top: var(--space-md);
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* Focus styles - consistent and visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Remove default focus for mouse users, keep for keyboard */
:focus:not(:focus-visible) {
  outline: none;
}

/* Definition list reset for semantic project cards */
dl {
  margin: 0;
}

dt, dd {
  margin: 0;
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about {
  max-width: 700px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg) var(--space-4xl);
}

.about__header {
  margin-bottom: var(--space-2xl);
}

.about__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.about__label::before {
  content: '>';
  opacity: 0.5;
}

.about__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: var(--space-md);
}

.about__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

.about__content {
  counter-reset: section;
}

.about__image {
  float: right;
  margin: 0 0 var(--space-lg) var(--space-lg);
  border-radius: 50%;
  border: 3px solid var(--accent-dim);
}

.about__content h2 {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  counter-increment: section;
}

.about__content h2:first-of-type {
  margin-top: 0;
}

.about__content h2::before {
  content: counter(section, decimal-leading-zero);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  flex-shrink: 0;
}

.about__links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.about__links li {
  margin: 0;
}

.about__links a {
  display: inline-flex;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  transition: all 0.2s var(--ease-out);
}

.about__links a:hover {
  border-color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
}

@media (max-width: 500px) {
  .about__image {
    float: none;
    display: block;
    margin: 0 auto var(--space-xl);
  }
}

/* --------------------------------------------------------------------------
   Series Indicator (Compact - Top of Post)
   -------------------------------------------------------------------------- */
.series-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: rgba(34, 211, 238, 0.15);
  border: 1px solid rgba(34, 211, 238, 0.4);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}

.series-indicator__label {
  color: #22d3ee;
  font-weight: 600;
}

.series-indicator__progress {
  color: var(--text-primary);
  font-weight: 500;
}

.series-indicator__label::after {
  content: '·';
  margin-left: var(--space-sm);
  color: var(--text-primary);
}

/* Fade in animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   Footnotes
   -------------------------------------------------------------------------- */

/* Inline footnote reference (superscript number in text) */
.footnote-ref {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  padding: 0 2px;
  margin-left: 1px;
  transition: color 0.2s var(--ease-out);
}

.footnote-ref:hover {
  color: var(--text-primary);
}

/* Scroll offset for back navigation */
[id^="fnref"] {
  scroll-margin-top: 6rem;
}

/* Separator before footnotes section */
.footnotes-sep {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-2xl) 0;
}

/* Footnotes section container */
.footnotes {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Remove the default "Sources" h2 counter */
.footnotes + section h2::before,
h2#sources::before,
h2:has(+ .footnotes-sep)::before {
  display: none;
}

/* Footnotes list */
.footnotes-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: footnote;
}

.footnote-item {
  position: relative;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
  line-height: 1.6;
  counter-increment: footnote;
  scroll-margin-top: 6rem;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

.footnote-item::before {
  content: counter(footnote);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  min-width: 1.5rem;
  text-align: center;
}

.footnote-item p {
  margin: 0;
}

/* Back reference arrow */
.footnote-backref {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  text-align: right;
  margin-top: var(--space-sm);
  opacity: 0.8;
  transition: opacity 0.2s var(--ease-out);
}

.footnote-backref:hover {
  opacity: 1;
}

/* Links within footnotes */
.footnote-item a:not(.footnote-backref) {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.3);
  transition: border-color 0.2s var(--ease-out);
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-all;
}

.footnote-item a:not(.footnote-backref):hover {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --space-4xl: 4rem;
  }

  .nav__link span:not(.sr-only) {
    display: none;
  }

  .article-card {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin: 0;
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--border-subtle);
    border-radius: 0;
  }

  .article-card:hover {
    transform: none;
    background: transparent;
  }

  .article-card__arrow {
    display: none;
  }

  .info-box-with-image {
    flex-direction: column;
  }
}