/* ==========================================================================
   Editorial Design System

   DESIGN DIRECTION:
   Monochrome editorial — generous whitespace, Lora headings + system sans
   body, faint navigation, clean vertical rhythm. Inspired by interfacecraft.dev.

   FOUNDATION:
   - Pure white background
   - Monochrome palette, no accent color
   - Narrow content column (560px)
   - Lora for headings, system sans-serif for body
   - Faint top-left navigation
   ========================================================================== */

/* --------------------------------------------------------------------------
   Self-hosted Fonts
   -------------------------------------------------------------------------- */
@font-face {
  font-family: 'Lora';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/lora-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Lora';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/lora-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Lora';
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/lora-italic-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Lora';
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/lora-italic-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Colors — Monochrome */
  --color-bg: #FFFFFF;

  /* Contrast hierarchy */
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #4A4A4A;
  --color-text-muted: #888888;
  --color-text-faint: #9A9A9A;

  --color-text: var(--color-text-primary);

  /* Borders */
  --color-border: #E8E8E8;

  /* Typography */
  --font-serif: 'Lora', Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Spacing (4px base grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Layout */
  --content-max-width: 640px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-medium: 250ms ease;
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* --------------------------------------------------------------------------
   Navigation — Fixed top-left
   -------------------------------------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  padding: var(--space-8);
  z-index: 10;
}

.site-nav .nav-name {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-faint);
  text-decoration: none;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  transition: color var(--transition-fast);
}

.site-nav .nav-name:hover {
  color: var(--color-text-muted);
}

.site-nav .nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-nav .nav-links a {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav .nav-links a:hover {
  color: var(--color-text-muted);
}

.site-nav .nav-links a.active {
  color: #808080;
}

/* Back link on post pages */
.site-nav .back-link {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav .back-link:hover {
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */
.main-content {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  flex: 1;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
  width: 100%;
}

.content-footer {
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.content-footer p {
  font-size: 0.8125rem;
  color: var(--color-text-faint);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

h1 {
  font-size: 2.25rem;
  margin-bottom: var(--space-3);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

h4 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-2);
}

p {
  margin: 0 0 var(--space-3) 0;
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeIn 0.5s ease both;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* --------------------------------------------------------------------------
   Links — Monochrome
   -------------------------------------------------------------------------- */
a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  margin-bottom: var(--space-16);
}

.hero-rule {
  width: 100%;
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0 0 var(--space-8);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-3);
  line-height: 1.2;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 420px;
}

/* --------------------------------------------------------------------------
   Content Sections
   -------------------------------------------------------------------------- */
section {
  margin-bottom: var(--space-8);
}

.section-heading {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.section-content {
  font-size: 1.0625rem;
  line-height: 1.7;
}

.section-content p {
  margin-bottom: var(--space-3);
}

.section-description {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Interests List
   -------------------------------------------------------------------------- */
.interests-list {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0 0;
}

.interests-list li {
  padding-left: var(--space-4);
  margin-bottom: var(--space-2);
  position: relative;
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
}

.interests-list li::before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--color-text-faint);
}

/* --------------------------------------------------------------------------
   Writing Section (post list)
   -------------------------------------------------------------------------- */
.writing-section {
  margin-top: var(--space-16);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  margin-bottom: 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list li:last-child {
  border-bottom: none;
}

.post-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.post-list a:hover {
  color: var(--color-text-secondary);
}

.post-list .post-title {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1rem;
  color: inherit;
}

.post-list .post-date {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-faint);
  white-space: nowrap;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   Post Page
   -------------------------------------------------------------------------- */
.post-header {
  margin-bottom: var(--space-8);
}

.post-header h1 {
  font-size: 2.25rem;
  font-weight: 400;
  margin-bottom: var(--space-2);
  line-height: 1.25;
}

.post-meta {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-faint);
}

.post-content {
  margin-bottom: var(--space-12);
}

/* Prose styles */
.prose {
  line-height: 1.7;
  font-size: 1.0625rem;
}

.prose p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.prose h2 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.prose ul, .prose ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
}

.prose li {
  margin-bottom: var(--space-2);
}

.prose blockquote {
  margin: var(--space-6) 0;
  padding-left: var(--space-4);
  border-left: 2px solid #D0D0D0;
  font-style: italic;
  color: var(--color-text-muted);
}

.prose img {
  max-width: 100%;
  height: auto;
  margin: var(--space-6) 0;
}

.prose a {
  color: var(--color-text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-text-faint);
}

.prose a:hover {
  text-decoration-color: var(--color-text-primary);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(0, 0, 0, 0.05);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--color-text);
}

.prose pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  background: rgba(0, 0, 0, 0.03);
  padding: var(--space-4);
  border-radius: 4px;
  overflow-x: auto;
  margin: var(--space-6) 0;
}

.prose pre code {
  background: none;
  padding: 0;
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-content h1 {
  margin-bottom: var(--space-6);
}

.about-content h2 {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  margin-top: var(--space-12);
}

.about-content p {
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.about-content a {
  color: var(--color-text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-text-faint);
}

.about-content a:hover {
  text-decoration-color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Reading Page
   -------------------------------------------------------------------------- */
.reading-content h1 {
  margin-bottom: var(--space-4);
}

.reading-content > p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: var(--space-12);
}

.reading-section {
  margin-bottom: var(--space-10);
}

.reading-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.reading-list li {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.reading-list li:last-child {
  border-bottom: none;
}

.reading-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
}

.reading-author {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* More writing section (post pages) */
.more-writing {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.more-writing h3 {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
  margin-top: 0;
}

.more-writing a {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.more-writing a:hover {
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: 0.9375rem;
}

th, td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 500;
  color: var(--color-text);
}

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

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */

/* Tablet and above */
@media (min-width: 768px) {
  .site-nav {
    padding: var(--space-8) var(--space-10);
  }

  h1 {
    font-size: 3rem;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .post-header h1 {
    font-size: 3rem;
  }

  .content-wrapper {
    padding: 100px var(--space-6);
  }
}

/* Large desktop */
@media (min-width: 1200px) {
  .content-wrapper {
    padding: 120px var(--space-6);
  }
}

/* Mobile */
@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  .site-nav {
    position: static;
    padding: var(--space-4) var(--space-4);
  }

  .site-nav .nav-links {
    flex-direction: row;
    gap: var(--space-3);
  }

  .site-nav .nav-name {
    margin-bottom: var(--space-1);
  }

  .site-nav .nav-name,
  .site-nav .nav-links a,
  .site-nav .back-link {
    font-size: 0.8125rem;
  }

  .content-wrapper {
    padding: var(--space-8) var(--space-4);
  }

  /* Hero */
  .hero-section {
    margin-bottom: var(--space-10);
  }

  .hero-title {
    font-size: 2rem;
    line-height: 1.2;
  }

  .hero-subtitle {
    font-size: 0.9375rem;
  }

  /* Sections */
  section {
    margin-bottom: var(--space-6);
  }

  /* Writing section */
  .writing-section {
    margin-top: var(--space-10);
  }

  .post-list a {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    padding: var(--space-3) 0;
  }

  .post-list .post-title {
    font-size: 0.9375rem;
    line-height: 1.4;
  }

  .post-list .post-date {
    font-size: 0.8125rem;
  }

  /* Post page */
  .post-header h1 {
    font-size: 1.875rem;
    line-height: 1.25;
  }

  .post-meta {
    font-size: 0.8125rem;
  }

  .back-link {
    margin-bottom: var(--space-10);
  }

  /* Prose on mobile */
  .prose {
    font-size: 1rem;
    line-height: 1.7;
  }

  .prose h2 {
    font-size: 1.375rem;
    margin-top: var(--space-8);
  }

  .prose h3 {
    font-size: 1.125rem;
    margin-top: var(--space-6);
  }

  .prose blockquote {
    margin-left: 0;
    margin-right: 0;
  }

  .prose pre {
    font-size: 0.8125rem;
    padding: var(--space-3);
    margin-left: calc(-1 * var(--space-4));
    margin-right: calc(-1 * var(--space-4));
    border-radius: 0;
  }

  .prose code {
    font-size: 0.8125em;
    word-break: break-word;
  }

  /* Reading page */
  .reading-content > p {
    margin-bottom: var(--space-8);
  }

  .reading-section {
    margin-bottom: var(--space-8);
  }

  .reading-title {
    font-size: 0.9375rem;
  }

  .reading-author {
    font-size: 0.8125rem;
  }

  /* Footer */
  .content-footer {
    padding: var(--space-8) var(--space-4);
  }

  .content-footer p {
    font-size: 0.75rem;
  }

  /* More writing */
  .more-writing {
    margin-top: var(--space-8);
    padding-top: var(--space-6);
  }

  .more-writing a {
    font-size: 0.9375rem;
  }
}

/* Very small screens */
@media (max-width: 374px) {
  html {
    font-size: 14px;
  }

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

  .content-wrapper {
    padding: var(--space-6) var(--space-3);
  }

  .site-nav {
    padding: var(--space-3) var(--space-3);
  }
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-muted {
  color: var(--color-text-muted);
}

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

.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;
}