/* ============================================
   Khaos Machine Blog — Design System
   ============================================ */

:root {
  --color-bg: #070623;
  --color-bg-raised: #0a0835;
  --color-surface: #0e0c42;
  --color-surface-hover: #131060;
  --color-accent: #ffcc00;
  --color-accent-dim: rgba(255, 204, 0, 0.15);
  --color-text: #b0b0c0;
  --color-text-bright: #e8e8f0;
  --color-text-muted: #6b6b80;
  --color-link: #ffcc00;
  --color-border: #1a1850;
  --color-border-subtle: #13113a;

  --font-heading: 'Sora', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  --max-width: 720px;
  --max-width-wide: 1100px;
  --max-width-full: 1400px;

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

  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--color-border);
  --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--color-accent);

  --transition: 0.2s ease;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================
   Header
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 6, 35, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 2rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}
.site-logo img {
  width: 32px;
  height: 32px;
}
.logo-text {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.04em;
}
.logo-sub {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.site-nav {
  display: flex;
  gap: 1.75rem;
  align-items: center;
}
.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text-bright);
}
.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 0.5rem;
}

/* ============================================
   Blog Hero (Home)
   ============================================ */

.blog-hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border-subtle);
  background: linear-gradient(180deg, var(--color-bg-raised) 0%, var(--color-bg) 100%);
}

.blog-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  line-height: 1.15;
}

.blog-hero-desc {
  font-size: 1.1rem;
  color: var(--color-text);
  max-width: 550px;
  line-height: 1.6;
}

/* ============================================
   Featured Post
   ============================================ */

.featured-section {
  margin: 3rem 0;
}

.post-card.featured {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition);
}
.post-card.featured:hover {
  box-shadow: var(--shadow-card-hover);
}
.post-card.featured .post-card-image {
  aspect-ratio: auto;
  min-height: 340px;
}
.post-card.featured .post-card-body {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.post-card.featured .post-card-title {
  font-size: 1.75rem;
  line-height: 1.25;
}
.post-card.featured .post-card-excerpt {
  font-size: 1rem;
  margin-top: 0.75rem;
}

/* ============================================
   Post Grid
   ============================================ */

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
  margin: 0 0 3rem;
}

/* ============================================
   Post Card
   ============================================ */

.post-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.post-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.post-card-image {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-raised);
}
.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.post-card:hover .post-card-image img {
  transform: scale(1.04);
}

.post-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card-tags {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.post-card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}
.post-card-title a {
  color: var(--color-text-bright);
  text-decoration: none;
}
.post-card-title a:hover { color: var(--color-accent); }

.post-card-excerpt {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.6;
  flex: 1;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.read-time {
  color: var(--color-text-muted);
}

/* ============================================
   Pagination
   ============================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2.5rem 0 1rem;
  border-top: 1px solid var(--color-border-subtle);
}

.pagination-btn {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.pagination-btn:hover:not(.disabled) {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.pagination-btn.disabled {
  opacity: 0.3;
  cursor: default;
}

.pagination-info {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ============================================
   Post Single — Hero
   ============================================ */

.post-hero {
  margin-bottom: 2.5rem;
  background: var(--color-bg-raised);
}

.post-hero-inner {
  max-width: var(--max-width-full);
  margin: 0 auto;
}

.post-hero img {
  width: 100%;
  max-height: 500px;
  object-fit: cover;
  display: block;
}

/* ============================================
   Post Single — Content
   ============================================ */

.post-container {
  max-width: var(--max-width);
  padding-bottom: 3rem;
}

.post-header {
  margin-bottom: 2.5rem;
}

.post-categories {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.post-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  color: var(--color-text-bright);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.meta-sep { opacity: 0.4; }

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin: 2.5rem 0 1rem;
  padding-top: 0.5rem;
}

.post-content h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin: 2rem 0 0.75rem;
}

.post-content h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin: 1.5rem 0 0.5rem;
}

.post-content p {
  margin-bottom: 1.35rem;
}

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

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

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(255, 204, 0, 0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition);
}
.post-content a:hover {
  text-decoration-color: var(--color-accent);
  color: var(--color-accent);
}

.post-content ul, .post-content ol {
  margin: 1rem 0 1.35rem 1.5rem;
}
.post-content li {
  margin-bottom: 0.5rem;
}
.post-content li::marker {
  color: var(--color-accent);
}

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-bg-raised);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-bright);
  font-style: italic;
}
.post-content blockquote p:last-child { margin-bottom: 0; }

.post-content code {
  font-size: 0.88em;
  background: var(--color-surface);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: var(--color-accent);
  border: 1px solid var(--color-border-subtle);
}

.post-content pre {
  background: var(--color-surface);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
}
.post-content pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2rem 0;
}

.post-content figure {
  margin: 2rem 0;
}
.post-content figcaption {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  text-align: center;
}

.post-content video {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 2rem 0;
}

.post-content iframe {
  max-width: 100%;
  margin: 2rem 0;
  border-radius: var(--radius-sm);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* ============================================
   Share
   ============================================ */

.post-share {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.share-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.share-links {
  display: flex;
  gap: 0.5rem;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}
.share-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}
.copy-btn.copied {
  color: #4ade80;
  border-color: #4ade80;
}

/* ============================================
   Post Nav (prev/next)
   ============================================ */

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border-subtle);
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  text-decoration: none;
  transition: all var(--transition);
}
.post-nav-link:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
}
.post-nav-link.next {
  text-align: right;
}

.nav-direction {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.nav-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-bright);
  line-height: 1.3;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  margin-top: 3rem;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-raised);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand .site-logo {
  margin-bottom: 0.75rem;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  max-width: 300px;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: 3rem;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-bright);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.footer-col ul {
  list-style: none;
}
.footer-col li { margin-bottom: 0.4rem; }
.footer-col a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--color-accent); }

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-subtle);
}
.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
  .post-card.featured {
    grid-template-columns: 1fr;
  }
  .post-card.featured .post-card-image {
    min-height: 220px;
  }
  .post-card.featured .post-card-body {
    padding: 1.5rem;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 1rem 2rem;
    gap: 0.75rem;
  }
  .site-nav.open { display: flex; }

  .nav-toggle { display: block; }

  .blog-hero {
    padding: 2.5rem 0 2rem;
  }
  .blog-hero-title { font-size: 1.75rem; }

  .post-grid {
    grid-template-columns: 1fr;
  }

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

  .post-hero img { max-height: 280px; }

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

  .post-share {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-grid {
    flex-direction: column;
    gap: 2rem;
  }
  .footer-links { gap: 2rem; }

  .container { padding: 0 1.25rem; }
}

@media (max-width: 480px) {
  .post-card-title { font-size: 1.05rem; }
  .post-card-body { padding: 1.25rem; }
  .post-card.featured .post-card-title { font-size: 1.35rem; }
}

/* ============================================
   Animations
   ============================================ */

@media (prefers-reduced-motion: no-preference) {
  .post-card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.5s ease forwards;
  }
  .post-grid .post-card:nth-child(1) { animation-delay: 0.05s; }
  .post-grid .post-card:nth-child(2) { animation-delay: 0.1s; }
  .post-grid .post-card:nth-child(3) { animation-delay: 0.15s; }
  .post-grid .post-card:nth-child(4) { animation-delay: 0.2s; }
  .post-grid .post-card:nth-child(5) { animation-delay: 0.25s; }
  .post-grid .post-card:nth-child(6) { animation-delay: 0.3s; }

  @keyframes fadeUp {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}