:root {
  --bg: #0e0f11;
  --bg-2: #16181c;
  --fg: #e9e9ea;
  --fg-muted: #a0a3a8;
  --fg-dim: #6b7076;
  --border: #23262b;
  --accent: #ff7ac6;
  --accent-2: #7ad4ff;
  --accent-3: #ffe066;
  --code-bg: #1a1d22;
  --code-fg: #ffd479;
  --link: #8fd4ff;
  --link-hover: #b8e6ff;
  --shadow: 0 6px 30px rgba(0, 0, 0, 0.4);
  --radius: 14px;
  --content-w: 720px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

html[data-theme="light"] {
  --bg: #fafaf7;
  --bg-2: #ffffff;
  --fg: #1a1c1f;
  --fg-muted: #5a5f66;
  --fg-dim: #8a9099;
  --border: #e3e4e7;
  --accent: #d63384;
  --accent-2: #1e7fbd;
  --accent-3: #c28800;
  --code-bg: #f2f1ec;
  --code-fg: #b7410e;
  --link: #1864ab;
  --link-hover: #0b4d85;
  --shadow: 0 4px 20px rgba(20, 20, 30, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
  font-size: 16px;
  word-break: keep-all;
  overflow-wrap: break-word;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.01em;
  font-size: 1rem;
}
.site-title:hover { text-decoration: none; color: var(--fg); }

.site-title .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: conic-gradient(var(--accent), var(--accent-2), var(--accent-3), var(--accent));
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 55%, transparent);
}

.site-tools {
  display: flex;
  gap: 6px;
}

.icon-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  font-family: inherit;
  font-size: 0.85rem;
  padding: 6px 10px;
  border-radius: 999px;
  cursor: pointer;
  line-height: 1;
  min-width: 36px;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}
.icon-btn:hover {
  border-color: var(--fg-muted);
  background: var(--bg-2);
}
.icon-btn:active { transform: translateY(1px); }

.site-main {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.site-footer {
  max-width: var(--content-w);
  margin: 40px auto 50px;
  padding: 24px 20px 40px;
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 0.85rem;
  text-align: center;
}
.site-footer a { color: var(--fg-muted); }

/* Language toggle anchor shares the icon-btn look */
a.icon-btn { text-decoration: none; }
a.icon-btn:hover { text-decoration: none; }

/* Index */
.intro {
  margin-bottom: 56px;
}
.site-tagline {
  font-size: 0.9rem;
  color: var(--fg-dim);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
.intro-body p {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--fg);
  margin: 0 0 16px;
}
.intro-body p:first-child {
  font-size: 1.22rem;
  line-height: 1.6;
  color: var(--fg);
  font-weight: 500;
}

.section-label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 40px 0 16px;
  font-weight: 600;
}
.section-label .muted {
  color: var(--fg-dim);
  font-weight: 400;
}

.posts-list { display: flex; flex-direction: column; gap: 4px; }

.post-card {
  display: block;
  padding: 20px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--fg);
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
  position: relative;
}
.post-card:hover {
  background: var(--bg-2);
  border-color: var(--border);
  text-decoration: none;
  color: var(--fg);
}
.post-card .post-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-dim);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}
.post-card .post-title {
  font-size: 1.24rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--fg);
}
.post-card .post-summary {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}
.post-card .post-more {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--accent-2);
  letter-spacing: 0.02em;
}

/* Post page */
.post { margin: 0; }
.post-header { margin-bottom: 32px; }
.post-header .post-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-dim);
  margin-bottom: 10px;
}
.post-header h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin: 0;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--fg) 0%, color-mix(in srgb, var(--accent) 50%, var(--fg)) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.post-body h1, .post-body h2, .post-body h3 {
  margin-top: 2.2em;
  margin-bottom: 0.6em;
  line-height: 1.3;
  font-weight: 700;
}
.post-body h1 { font-size: 1.6rem; }
.post-body h2 { font-size: 1.35rem; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.post-body h3 { font-size: 1.1rem; color: var(--fg); }
.post-body h2::before {
  content: '§ ';
  color: var(--accent);
  margin-right: 4px;
  font-weight: 400;
}

.post-body p {
  margin: 0 0 1.1em;
  font-size: 1.02rem;
  line-height: 1.75;
}

.post-body strong { color: var(--fg); font-weight: 700; }
.post-body em { color: var(--fg); }
html[data-theme="dark"] .post-body strong { color: #ffffff; }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid var(--border);
}

.post-body ul, .post-body ol {
  padding-left: 1.4em;
  margin: 0 0 1.2em;
}
.post-body li {
  margin: 0.35em 0;
  line-height: 1.7;
}
.post-body li::marker { color: var(--fg-dim); }
.post-body ul li::marker { content: '— '; }

.post-body hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 20%, var(--border) 80%, transparent);
  margin: 2.5em 0;
}

.post-body a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent);
  text-underline-offset: 3px;
}

.post-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 16px;
  margin: 1.2em 0;
  color: var(--fg-muted);
  background: var(--bg-2);
  border-radius: 0 8px 8px 0;
}

/* Post navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.post-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-2);
  color: var(--fg);
  transition: border-color 0.15s, transform 0.15s;
}
.post-nav a:hover {
  border-color: var(--accent-2);
  text-decoration: none;
  color: var(--fg);
}
.post-nav .nav-label {
  font-size: 0.78rem;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
}
.post-nav .nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
}
.post-nav .nav-next { text-align: right; }

/* Mobile */
@media (max-width: 640px) {
  .site-main { padding: 24px 16px 60px; }
  .site-header { padding: 12px 16px; }
  .site-title-text { font-size: 0.95rem; }
  .post-header h1 { font-size: 1.55rem; }
  .post-body h2 { font-size: 1.2rem; }
  .post-body h3 { font-size: 1.05rem; }
  .post-body p, .intro-body p { font-size: 1rem; }
  .intro-body p:first-child { font-size: 1.1rem; }
  .post-card { padding: 16px 14px; }
  .post-card .post-title { font-size: 1.1rem; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .nav-next { text-align: left; }
}

/* Respect user prefs */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* Selection */
::selection {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
  color: #fff;
}
html[data-theme="light"] ::selection {
  background: color-mix(in srgb, var(--accent) 35%, transparent);
  color: #000;
}