/* ========================================
   Deep Black Pearl — Design System
   A premium dark editorial blog theme.
   ======================================== */

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

:root {
  /* Color palette — warm dark with pearl accents */
  --bg-primary: #0a0a0c;
  --bg-secondary: #111114;
  --bg-card: #16161a;
  --bg-card-hover: #1c1c21;

  --text-primary: #e8e6e3;
  --text-secondary: #9a9a9e;
  --text-muted: #5a5a5e;

  --accent: #c9b99a;
  --accent-dim: #8a7d65;
  --accent-glow: rgba(201, 185, 154, 0.08);

  --border: #222228;
  --border-light: #2a2a30;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Newsreader', 'Georgia', serif;

  /* Spacing */
  --container-width: 720px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* --- Container --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* --- Header --- */
.site-header {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.site-logo:hover {
  opacity: 0.7;
}

.site-nav {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Main --- */
.site-main {
  flex: 1;
}

/* --- Home / Hero --- */
.home {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--border);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-sm);
}

.hero-tagline {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 480px;
}

/* --- Post List (Home) --- */
.post-list {
  padding: var(--space-lg) 0 var(--space-2xl);
}

.post-card {
  display: block;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background 0.3s ease;
}

.post-card:first-child {
  border-top: none;
}

.post-card:hover {
  background: var(--accent-glow);
}

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

.post-card-date {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.post-card-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xs);
  transition: color 0.2s ease;
}

.post-card-subtitle {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xs);
}

.post-card-meta {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* --- Post Page --- */
.post {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.post-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-xl);
}

.post-date {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: var(--space-sm);
}

.post-title {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.post-subtitle {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-style: italic;
}

.post-meta {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-top: var(--space-sm);
}

/* --- Post Content Typography --- */
.post-content {
  padding-bottom: var(--space-2xl);
}

.post-content p {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  line-height: 1.8;
}

.post-content h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.post-content h3 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

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

.post-content em {
  font-style: italic;
  color: var(--text-primary);
}

.post-content blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 2px solid var(--accent-dim);
  background: var(--accent-glow);
  border-radius: 0 4px 4px 0;
}

.post-content blockquote p {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.post-content ul, .post-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-md);
}

.post-content li {
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  line-height: 1.7;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent-dim);
  transition: text-decoration-color 0.2s ease;
}

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

.post-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: var(--space-xl) 0;
}

.post-content code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85em;
  background: var(--bg-card);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--accent);
}

.post-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.post-content pre code {
  background: none;
  padding: 0;
}

/* --- Post Footer --- */
.post-footer {
  padding-bottom: var(--space-2xl);
}

.post-separator {
  width: 40px;
  height: 1px;
  background: var(--accent-dim);
  margin-bottom: var(--space-lg);
}

.post-end-note {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-style: italic;
}

/* --- About Page --- */
.page {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-md);
}

.page h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.page p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
  margin-top: auto;
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-align: center;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

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

  .post-title {
    font-size: 1.8rem;
  }

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

  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* --- Subtle Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero {
  animation: fadeIn 0.8s ease-out;
}

.post-header {
  animation: fadeIn 0.6s ease-out;
}

.post-card {
  animation: fadeIn 0.5s ease-out;
  animation-fill-mode: backwards;
}

.post-card:nth-child(1) { animation-delay: 0.1s; }
.post-card:nth-child(2) { animation-delay: 0.2s; }
.post-card:nth-child(3) { animation-delay: 0.3s; }
.post-card:nth-child(4) { animation-delay: 0.4s; }
.post-card:nth-child(5) { animation-delay: 0.5s; }