/* ==========================================================================
   The Quiet Atelier — Personal AI Blog Design System
   A refined editorial space. Crafted with restraint and breath.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Google Fonts Import
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500;9..144,600;9..144,700;9..144,900&family=Sora:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  line-height: 1.6;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  table-layout: fixed;
  width: 100%;
}

/* --------------------------------------------------------------------------
   3. Design Tokens — Light Mode (Default)
   -------------------------------------------------------------------------- */
:root {
  --bg: #FAF7F2;
  --bg-elevated: #FFFFFF;
  --bg-card: #F5F1EA;
  --text: #1C1917;
  --text-secondary: #6B6560;
  --text-tertiary: #9B938A;
  --accent: #B85C38;
  --accent-hover: #A04D2E;
  --border: #E8E0D5;
  --code-bg: #F0EBE3;
  --shadow: rgba(28, 25, 23, 0.06);
  --shadow-md: rgba(28, 25, 23, 0.10);
  --shadow-lg: rgba(28, 25, 23, 0.14);

  /* Typography */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Sora', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Sizing */
  --max-width-article: 720px;
  --max-width-grid: 1080px;
  --max-width-wide: 1200px;
  --nav-height: 72px;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s var(--ease);
  --transition: 0.35s var(--ease);
  --transition-slow: 0.6s var(--ease-out);

  color-scheme: light;
}

/* --------------------------------------------------------------------------
   4. Design Tokens — Dark Mode
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --bg: #16140F;
  --bg-elevated: #1F1D18;
  --bg-card: #1A1814;
  --text: #E8E0D5;
  --text-secondary: #9B938A;
  --text-tertiary: #6B6560;
  --accent: #D4915D;
  --accent-hover: #E0A170;
  --border: #2A2722;
  --code-bg: #1F1D18;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-md: rgba(0, 0, 0, 0.4);
  --shadow-lg: rgba(0, 0, 0, 0.5);

  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   5. Base Typography
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: -0.003em;
  transition: background-color var(--transition), color var(--transition);
}

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

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  font-variation-settings: "opsz" 144;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-variation-settings: "opsz" 72;
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-variation-settings: "opsz" 36;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

p {
  margin-bottom: 1.25em;
}

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

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

a {
  color: var(--accent);
  transition: color var(--transition-fast);
}

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

::selection {
  background: var(--accent);
  color: var(--bg-elevated);
}

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

.container-narrow {
  width: 100%;
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-grid {
  width: 100%;
  max-width: var(--max-width-grid);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* --------------------------------------------------------------------------
   7. Navigation Bar — Fixed, Glassmorphism
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  box-shadow: 0 1px 0 var(--shadow);
}

.navbar-inner {
  height: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  font-variation-settings: "opsz" 144;
  color: var(--text);
  letter-spacing: -0.04em;
  transition: opacity var(--transition-fast);
}

.navbar-brand:hover {
  opacity: 0.7;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* --------------------------------------------------------------------------
   8. Theme Toggle Button
   -------------------------------------------------------------------------- */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  color: var(--accent);
  background: var(--bg-card);
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform 0.5s var(--ease-out), opacity 0.3s var(--ease);
}

.theme-toggle .sun-icon {
  position: absolute;
  opacity: 0;
  transform: rotate(90deg) scale(0);
}

.theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="dark"] .theme-toggle .sun-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="dark"] .theme-toggle .moon-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0);
}

/* --------------------------------------------------------------------------
   9. Reading Progress Bar
   -------------------------------------------------------------------------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  z-index: 1001;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--accent);
}

/* --------------------------------------------------------------------------
   10. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-elevated);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--bg-elevated);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--bg-card);
  border-color: var(--text-tertiary);
  color: var(--text);
}

.btn-text {
  background: transparent;
  color: var(--accent);
  padding: 0.5rem 0;
  font-weight: 500;
}

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

.btn-danger {
  background: transparent;
  color: #C44A3C;
  border-color: transparent;
}

.btn-danger:hover {
  background: rgba(196, 74, 60, 0.1);
  color: #B23A2C;
}

[data-theme="dark"] .btn-danger {
  color: #E07060;
}

[data-theme="dark"] .btn-danger:hover {
  background: rgba(224, 112, 96, 0.15);
  color: #F08070;
}

/* --------------------------------------------------------------------------
   11. Tags
   -------------------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tag:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--bg-elevated);
}

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

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

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: var(--max-width-grid);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.hero-title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700;
  font-variation-settings: "opsz" 144;
  line-height: 1.05;
  letter-spacing: -0.045em;
  margin-bottom: var(--space-md);
  max-width: 14ch;
}

.hero-title .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 400;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 52ch;
  line-height: 1.65;
  font-weight: 300;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.hero-divider {
  width: 40px;
  height: 1px;
  background: var(--border);
}

/* --------------------------------------------------------------------------
   13. Article Card Grid
   -------------------------------------------------------------------------- */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.article-grid-section {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.article-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow-md);
  border-color: transparent;
}

.article-card:hover::before {
  transform: scaleX(1);
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
}

.article-card-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.article-card-title {
  font-size: 1.5rem;
  font-weight: 600;
  font-variation-settings: "opsz" 36;
  line-height: 1.25;
  margin-bottom: 0.6rem;
  color: var(--text);
  transition: color var(--transition-fast);
}

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

.article-card-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: auto;
}

.article-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.article-card-tag {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  padding: 0.15rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: 999px;
  border: 1px solid var(--border);
}

.article-card-readtime {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: var(--font-code);
  white-space: nowrap;
}

/* Featured card (first article, wider) */
.article-card.featured {
  grid-column: span 2;
  background: var(--bg-elevated);
}

.article-card.featured .article-card-title {
  font-size: 2rem;
  font-variation-settings: "opsz" 72;
}

/* --------------------------------------------------------------------------
   14. Article Detail Page
   -------------------------------------------------------------------------- */
.article-page {
  padding-top: var(--nav-height);
}

.article-header {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-md) var(--space-lg);
  text-align: left;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast), gap var(--transition-fast);
}

.back-button:hover {
  color: var(--accent);
  gap: 0.75rem;
}

.back-button svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.back-button:hover svg {
  transform: translateX(-3px);
}

.article-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  font-variation-settings: "opsz" 144;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-sm);
}

.article-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.5;
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
  font-style: italic;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.article-meta svg {
  width: 15px;
  height: 15px;
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   15. Article Content — Markdown Rendered
   -------------------------------------------------------------------------- */
.article-content {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-2xl);
  font-size: 1.075rem;
  line-height: 1.8;
  color: var(--text);
}

.article-content > *:first-child {
  margin-top: 0;
}

.article-content h2 {
  margin-top: 2.5em;
  margin-bottom: 0.6em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.article-content h3 {
  margin-top: 2em;
  margin-bottom: 0.5em;
}

.article-content h4 {
  margin-top: 1.5em;
  margin-bottom: 0.4em;
}

.article-content p {
  margin-bottom: 1.4em;
}

.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: text-decoration-color var(--transition-fast);
}

.article-content a:hover {
  text-decoration-color: var(--accent);
}

.article-content strong {
  font-weight: 600;
  color: var(--text);
}

.article-content em {
  font-style: italic;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.4em;
  padding-left: 1.5em;
}

.article-content ul li {
  list-style: none;
  position: relative;
  margin-bottom: 0.5em;
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: -1em;
  top: 0.7em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.article-content ol {
  counter-reset: item;
}

.article-content ol li {
  list-style: none;
  counter-increment: item;
  position: relative;
  margin-bottom: 0.5em;
}

.article-content ol li::before {
  content: counter(item);
  position: absolute;
  left: -1.75em;
  top: 0;
  font-family: var(--font-code);
  font-size: 0.8em;
  color: var(--accent);
  font-weight: 600;
}

.article-content blockquote {
  margin: 1.8em 0;
  padding: 0.5em 0 0.5em 1.5em;
  border-left: 3px solid var(--accent);
  color: var(--text-secondary);
  font-style: italic;
  font-family: var(--font-display);
  font-size: 1.15em;
  line-height: 1.6;
}

.article-content blockquote p {
  margin-bottom: 0;
}

.article-content code {
  font-family: var(--font-code);
  font-size: 0.875em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--border);
}

.article-content pre {
  margin: 1.8em 0;
  padding: 1.2em 1.5em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
}

.article-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: inherit;
}

.article-content img {
  width: 100%;
  border-radius: var(--radius-md);
  margin: 1.8em 0;
  box-shadow: 0 4px 16px var(--shadow);
}

.article-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2.5em 0;
  position: relative;
}

.article-content hr::after {
  content: '* * *';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg);
  padding: 0 1rem;
  font-family: var(--font-display);
  color: var(--text-tertiary);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
}

.article-content table {
  margin: 1.8em 0;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.article-content th,
.article-content td {
  padding: 0.7em 1em;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.article-content th {
  background: var(--bg-card);
  font-weight: 600;
  font-size: 0.85rem;
}

.article-content td {
  color: var(--text-secondary);
}

.article-content tr:last-child td {
  border-bottom: none;
}

/* --------------------------------------------------------------------------
   16. Article Navigation (Prev/Next)
   -------------------------------------------------------------------------- */
.article-nav {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.article-nav-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.article-nav-item:hover {
  border-color: var(--accent);
  background: var(--bg-card);
  transform: translateY(-2px);
}

.article-nav-item.next {
  text-align: right;
}

.article-nav-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.article-nav-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}

.article-nav-item:hover .article-nav-title {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   17. About Page
   -------------------------------------------------------------------------- */
.about-page {
  padding-top: var(--nav-height);
}

.about-header {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-md) var(--space-lg);
}

.about-eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.about-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  font-variation-settings: "opsz" 144;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-sm);
}

.about-content {
  max-width: var(--max-width-article);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--text);
}

.about-content p {
  margin-bottom: 1.5em;
}

.about-section {
  margin-bottom: var(--space-xl);
}

.about-section h2 {
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.about-interests {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-md);
}

.about-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.about-contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.about-contact-item a {
  color: var(--accent);
  font-family: var(--font-code);
  font-size: 0.9rem;
}

.about-contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   18. Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-2xl);
  background: var(--bg);
}

.footer-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

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

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  max-width: 30ch;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

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

.footer-icp a {
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   19. Admin Page
   -------------------------------------------------------------------------- */
.admin-page {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.admin-login {
  max-width: 400px;
  margin: var(--space-2xl) auto;
  padding: var(--space-xl) var(--space-md);
}

.admin-login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  box-shadow: 0 8px 32px var(--shadow);
}

.admin-login-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.admin-login-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

.admin-login-error {
  color: #C44A3C;
  font-size: 0.85rem;
  margin-bottom: var(--space-sm);
  min-height: 1.2em;
}

[data-theme="dark"] .admin-login-error {
  color: #E07060;
}

.admin-dashboard {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.admin-title {
  font-size: 1.75rem;
}

.admin-toolbar {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

/* Article list in admin */
.admin-article-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.admin-article-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.admin-article-row:hover {
  border-color: var(--text-tertiary);
  background: var(--bg-elevated);
}

.admin-article-info {
  flex-grow: 1;
  min-width: 0;
}

.admin-article-title {
  font-weight: 500;
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.admin-article-meta {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.admin-status {
  font-size: 0.7rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.admin-status.published {
  background: rgba(76, 145, 90, 0.12);
  color: #4C915A;
}

.admin-status.draft {
  background: rgba(155, 147, 138, 0.15);
  color: var(--text-tertiary);
}

[data-theme="dark"] .admin-status.published {
  background: rgba(76, 145, 90, 0.2);
  color: #7DBE8A;
}

.admin-article-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.admin-icon-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.admin-icon-btn:hover {
  background: var(--bg);
  color: var(--accent);
}

.admin-icon-btn.delete:hover {
  color: #C44A3C;
}

[data-theme="dark"] .admin-icon-btn.delete:hover {
  color: #E07060;
}

.admin-icon-btn svg {
  width: 16px;
  height: 16px;
}

/* Editor form */
.admin-editor {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.admin-editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.admin-editor-title {
  font-size: 1.25rem;
  font-weight: 500;
}

.admin-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.admin-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: var(--space-md);
}

.admin-form-group.full {
  grid-column: span 2;
}

.admin-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.admin-input,
.admin-textarea,
.admin-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.admin-input:focus,
.admin-textarea:focus,
.admin-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

.admin-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.admin-markdown-editor {
  font-family: var(--font-code);
  font-size: 0.875rem;
  min-height: 400px;
  line-height: 1.7;
}

.admin-preview-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.admin-preview-pane {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  padding: var(--space-md);
  min-height: 400px;
  max-height: 600px;
  overflow-y: auto;
}

.admin-preview-pane-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--border);
}

.admin-preview-content {
  font-size: 0.95rem;
  line-height: 1.7;
}

.admin-preview-content h1,
.admin-preview-content h2,
.admin-preview-content h3 {
  margin-top: 1em;
  margin-bottom: 0.4em;
}

.admin-editor-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.admin-hidden {
  display: none;
}

/* --------------------------------------------------------------------------
   20. Loading & Empty States
   -------------------------------------------------------------------------- */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--text-tertiary);
  gap: var(--space-sm);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--text-tertiary);
}

.empty-state-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.empty-state-text {
  font-size: 0.9rem;
}

.error-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--text-tertiary);
}

.error-state-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

/* --------------------------------------------------------------------------
   21. Toast Notification
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  padding: 0.75rem 1.5rem;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 8px 24px var(--shadow-lg);
  z-index: 2000;
  transition: transform var(--transition);
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: #C44A3C;
  color: #fff;
}

[data-theme="dark"] .toast.error {
  background: #E07060;
  color: #16140F;
}

/* --------------------------------------------------------------------------
   22. Fade-in Animation
   -------------------------------------------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
  will-change: opacity, transform;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in:nth-child(2) { transition-delay: 0.08s; }
.fade-in:nth-child(3) { transition-delay: 0.16s; }
.fade-in:nth-child(4) { transition-delay: 0.24s; }
.fade-in:nth-child(5) { transition-delay: 0.32s; }
.fade-in:nth-child(6) { transition-delay: 0.40s; }

/* Page transition */
.page-transition {
  animation: pageEnter 0.5s var(--ease-out);
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   23. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .article-card.featured {
    grid-column: span 1;
  }

  .admin-preview-section {
    grid-template-columns: 1fr;
  }

  .admin-form-row {
    grid-template-columns: 1fr;
  }

  .admin-form-group.full {
    grid-column: span 1;
  }

  .hero-title {
    max-width: none;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .navbar-links {
    gap: var(--space-md);
  }

  .navbar-link {
    font-size: 0.85rem;
  }

  .hero {
    padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-lg);
  }

  .article-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .article-nav {
    grid-template-columns: 1fr;
  }

  .article-nav-item.next {
    text-align: left;
  }

  .footer-top {
    flex-direction: column;
  }

  .admin-article-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .admin-article-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

@media (max-width: 480px) {
  .navbar-links {
    gap: var(--space-sm);
  }

  .navbar-link {
    font-size: 0.8rem;
  }

  .article-card {
    padding: var(--space-md);
  }

  .article-card-title {
    font-size: 1.25rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .container,
  .container-narrow,
  .container-grid {
    padding: 0 var(--space-sm);
  }
}

/* --------------------------------------------------------------------------
   24. Accessibility & Motion Preferences
   -------------------------------------------------------------------------- */
@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;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}