/* Supabase-inspired dark design system. Dark mode native. */

:root {
  /* Surfaces */
  --bg: #171717;
  --bg-deep: #0f0f0f;
  --bg-lift: #1c1c1c;

  /* Text */
  --fg: #fafafa;
  --fg-secondary: #b4b4b4;
  --fg-muted: #898989;

  /* Borders */
  --border-subtle: #242424;
  --border: #2e2e2e;
  --border-strong: #363636;

  /* Brand + links */
  --brand: #3ecf8e;
  --link: #00c573;

  /* Code surfaces */
  --code-bg: #0f0f0f;
  --code-fg: #fafafa;
  --code-border: #2e2e2e;

  /* Prism token palette tuned for dark bg, low saturation */
  --token-comment: #6b7280;
  --token-keyword: #c792ea;
  --token-string:  #a5d6a7;
  --token-number:  #f78c6c;
  --token-fn:      #82aaff;
  --token-class:   #ffcb6b;
  --token-punct:   #b4b4b4;
  --token-op:      #c792ea;

  /* Layout */
  --maxw: 720px;
  --maxw-wide: 880px;

  /* Type stacks. Pretendard for Latin + Korean harmony, loaded via CDN. */
  --font-sans: "Pretendard Variable", Pretendard, ui-sans-serif, -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "D2 coding", D2Coding, "Source Code Pro", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Containers */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* Links */
a {
  color: var(--link);
  text-decoration: none;
}
a:hover { color: var(--fg); text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Header */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

/* Brand mark with green leading dot */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
}
.brand:hover { color: var(--fg); text-decoration: none; }
.brand::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background: var(--brand);
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.site-nav a,
.site-nav .nav-dropdown > summary {
  color: var(--fg-secondary);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0;
}
.site-nav a:hover { color: var(--fg); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--fg); }

/* Tools dropdown - pure CSS via details/summary */
.site-nav .nav-dropdown {
  position: relative;
}
.site-nav .nav-dropdown > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.site-nav .nav-dropdown > summary::-webkit-details-marker { display: none; }
.site-nav .nav-dropdown > summary::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  opacity: 0.7;
}
.site-nav .nav-dropdown[open] > summary { color: var(--fg); }
.site-nav .nav-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-lift);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  min-width: 160px;
  display: flex;
  flex-direction: column;
  z-index: 30;
}
.site-nav .nav-menu a {
  display: block;
  padding: 8px 12px;
  color: var(--fg-secondary);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
}
.site-nav .nav-menu a:hover {
  color: var(--fg);
  background: var(--border-subtle);
  text-decoration: none;
}

/* Footer */
.site-footer {
  margin-top: 96px;
  padding: 32px 0;
  border-top: 1px solid var(--border-subtle);
  color: var(--fg-muted);
  font-size: 14px;
}
.site-footer a { color: var(--fg-secondary); }
.site-footer a:hover { color: var(--fg); text-decoration: none; }

/* Main spacing */
main.container {
  padding-top: 96px;
  padding-bottom: 96px;
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 96px;
}
.hero-text { display: flex; flex-direction: column; gap: 12px; }
.avatar {
  width: 56px;
  height: 56px;
  border-radius: 9999px;
  object-fit: cover;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.hero h1 {
  margin: 0;
  font-size: 72px;
  font-weight: 400;
  line-height: 1.0;
  letter-spacing: -0.025em;
  color: var(--fg);
}
.tagline {
  margin: 0;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--fg-secondary);
}

/* Section heading */
.section-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--fg-muted);
}

/* Generic headings (used inside prose and on simple pages) */
h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.2;
  color: var(--fg);
}
h1 { font-size: 48px; line-height: 1.1; letter-spacing: -0.02em; margin-top: 0; }
h2 { font-size: 32px; line-height: 1.2; letter-spacing: -0.01em; margin-top: 64px; margin-bottom: 16px; }
h3 { font-size: 24px; line-height: 1.3; letter-spacing: -0.005em; margin-top: 40px; margin-bottom: 12px; }
h4 { font-size: 18px; line-height: 1.4; margin-top: 32px; margin-bottom: 8px; }

hr {
  border: 0;
  border-top: 1px solid var(--border-subtle);
  margin: 48px 0;
}

/* Section spacing */
section + section { margin-top: 64px; }

/* Post list - cards */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}
.post-list li {
  border: 1px solid var(--border);
  background: var(--bg-lift);
  border-radius: 12px;
  padding: 24px;
  transition: border-color 120ms ease, background 120ms ease;
}
.post-list li:hover {
  border-color: var(--border-strong);
  background: #1f1f1f;
}
.post-link {
  display: block;
  color: var(--fg);
}
.post-link:hover { color: var(--fg); text-decoration: none; }
.post-meta {
  display: block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}
.post-title {
  display: block;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.16px;
  color: var(--fg);
}
.post-link:hover .post-title { color: var(--brand); }
.post-excerpt {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg-secondary);
}

/* Tag chips */
.tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  vertical-align: middle;
}
.tag {
  display: inline-block;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--fg-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 9999px;
  line-height: 1.6;
}

/* All-posts link */
.posts-more {
  margin-top: 24px;
}
.posts-more a {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
}
.posts-more a:hover {
  border-color: var(--border-strong);
  background: var(--bg-lift);
  text-decoration: none;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--brand);
  color: #0f0f0f;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 9999px;
  border: 1px solid var(--brand);
}
.btn-primary:hover {
  background: #4fd99a;
  color: #0f0f0f;
  text-decoration: none;
}
.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--fg);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--border-strong);
  background: var(--bg-lift);
  text-decoration: none;
}

/* Prose */
.prose { max-width: var(--maxw); }
.prose .post-header { margin-bottom: 48px; }
.prose .post-header .post-meta { margin-bottom: 16px; }
.prose .post-header h1 {
  margin: 0;
  font-size: 48px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose pre,
.prose table {
  margin: 20px 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
}
.prose ul, .prose ol { padding-left: 24px; }
.prose li { margin: 6px 0; }
.prose blockquote {
  border-left: 2px solid var(--border-strong);
  margin: 24px 0;
  padding: 4px 0 4px 16px;
  color: var(--fg-secondary);
}
.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}
.prose a { color: var(--link); }
.prose a:hover { color: var(--fg); text-decoration: underline; }
.prose table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
}
.prose th, .prose td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.prose th {
  background: var(--bg-lift);
  color: var(--fg);
  font-weight: 500;
}

/* Inline code */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--fg);
  border: 1px solid var(--code-border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}

/* Code blocks (Gatsby/Prism markup) */
.gatsby-highlight {
  margin: 24px 0;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  overflow: hidden;
}
.gatsby-highlight pre,
.prose pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--code-fg);
  background: transparent;
}
.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
}
.gatsby-highlight pre code,
.prose pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
  white-space: pre;
}

/* Prism token coloring - subtle, dark-friendly */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: var(--token-comment); font-style: italic; }
.token.keyword, .token.boolean, .token.tag, .token.selector { color: var(--token-keyword); }
.token.string, .token.attr-value, .token.char { color: var(--token-string); }
.token.number { color: var(--token-number); }
.token.function { color: var(--token-fn); }
.token.class-name { color: var(--token-class); }
.token.punctuation { color: var(--token-punct); }
.token.operator, .token.assign-left, .token.variable { color: var(--token-op); }
.token.builtin { color: var(--token-fn); }
.token.annotation { color: var(--token-fn); }
.token.generics { color: var(--token-class); }

/* Korean line wrapping */
.prose { word-break: keep-all; overflow-wrap: anywhere; }
.prose pre code { word-break: normal; overflow-wrap: normal; }

/* Back link inside posts */
.back-link {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.back-link:hover { color: var(--fg); text-decoration: none; }

/* Responsive: single 600px breakpoint */
@media (max-width: 600px) {
  .container { padding: 0 16px; }

  main.container {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .site-footer { margin-top: 56px; padding: 24px 0; }

  .header-inner {
    padding-top: 12px;
    padding-bottom: 12px;
    gap: 12px;
  }

  .site-nav { gap: 14px; }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 56px;
  }
  .hero h1 { font-size: 44px; line-height: 1.05; }

  h1 { font-size: 36px; }
  h2 { font-size: 24px; margin-top: 40px; }
  h3 { font-size: 20px; margin-top: 28px; }

  .prose .post-header h1 { font-size: 36px; }

  .post-list li { padding: 16px; }
  .post-title { font-size: 20px; }

  section + section { margin-top: 48px; }
}