@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css");

/* ============================================================
   박종준 기술 블로그 — Toss-style flat system
   ============================================================ */
:root {
  --blue: #3182F6;
  --blue-pressed: #1B64DA;
  --blue-tint: #E8F3FF;

  --grey900: #191F28;
  --grey800: #333D4B;
  --grey700: #4E5968;
  --grey600: #6B7684;
  --grey500: #8B95A1;
  --grey400: #B0B8C1;
  --grey300: #D1D6DB;
  --grey200: #E5E8EB;
  --grey100: #F2F4F6;
  --grey50:  #F9FAFB;
  --white:   #FFFFFF;

  --page-bg: var(--grey50);
  --surface: var(--white);
  --border: var(--grey200);
  --border-soft: var(--grey100);
  --text: var(--grey900);
  --text-body: var(--grey800);
  --text-sub: var(--grey600);
  --tint: var(--blue-tint);
  --tint-text: var(--blue);
  --code-bg: var(--grey900);
  --code-text: #E7ECF3;
  --inline-code-bg: var(--grey100);

  --maxw: 1040px;
  --readw: 720px;
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 1px 3px rgba(0, 27, 55, .06), 0 1px 2px rgba(0, 27, 55, .04);
  --shadow-hover: 0 8px 24px rgba(0, 27, 55, .10);
  --font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
          "Apple SD Gothic Neo", system-ui, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #15161A;
    --surface: #1E2026;
    --border: #2C2F36;
    --border-soft: #24262C;
    --text: #F2F4F6;
    --text-body: #D1D6DB;
    --text-sub: #8B95A1;
    --blue: #4E95FF;
    --blue-pressed: #3182F6;
    --tint: rgba(78, 149, 255, .14);
    --tint-text: #7FB2FF;
    --code-bg: #0E0F13;
    --code-text: #E7ECF3;
    --inline-code-bg: #2A2D34;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4);
    --shadow-hover: 0 10px 28px rgba(0, 0, 0, .5);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text-body);
  font-family: var(--font);
  line-height: 1.7;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
a { color: inherit; }
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(49, 130, 246, .4);
  border-radius: 8px;
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--page-bg);
  background: color-mix(in srgb, var(--page-bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0;
  color: var(--text);
  text-decoration: none;
}
.links { display: flex; align-items: center; gap: 4px; }
.links .nav-home { order: 1; }
.links .nav-about { order: 2; }
.links .nav-resume { order: 3; }
.links .nav-github { order: 4; }
.links a {
  text-decoration: none;
  color: var(--text-sub);
  font-weight: 600;
  font-size: .92rem;
  padding: 8px 14px;
  border-radius: 999px;
  transition: color .18s, background .18s;
}
.links a:hover { color: var(--text); background: var(--grey100); }
@media (prefers-color-scheme: dark) { .links a:hover { background: #24262C; } }
.links .link-gh { color: var(--blue); }
.links .link-gh:hover { background: var(--tint); color: var(--blue); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px 72px; }

/* ---------- hero ---------- */
.hero { padding: 72px 4px 40px; }
.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--blue);
  background: var(--tint);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero-title {
  margin: 0 0 14px;
  font-size: clamp(2.1rem, 5.2vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0;
  color: var(--text);
}
.hero-sub {
  margin: 0;
  font-size: clamp(1.02rem, 2.2vw, 1.22rem);
  color: var(--text-sub);
  font-weight: 500;
  max-width: 640px;
}
.hero-body { margin-top: 16px; color: var(--text-sub); max-width: 680px; }
.hero-body :last-child { margin-bottom: 0; }

/* ---------- category filter ---------- */
.filter {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 4px 20px;
  margin-bottom: 8px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.filter::-webkit-scrollbar { display: none; }
.chip {
  flex: 0 0 auto;
  font-family: inherit;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-sub);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: all .16s ease;
  white-space: nowrap;
}
.chip:hover { color: var(--text); border-color: var(--grey300); }
.chip.is-active {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}
@media (prefers-color-scheme: dark) { .chip.is-active { color: #0E0F13; } }

/* ---------- post grid ---------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}
.post-item { display: block; }
.post-item.is-hidden { display: none; }
.card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 26px 26px 22px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--blue) 40%, var(--border));
}
.card:active { transform: translateY(-1px); }
.card-title {
  margin: 14px 0 8px;
  font-size: 1.24rem;
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0;
  color: var(--text);
}
.excerpt {
  margin: 0 0 18px;
  color: var(--text-sub);
  font-size: .95rem;
  line-height: 1.62;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cats { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--tint-text);
  background: var(--tint);
  padding: 4px 10px;
  border-radius: 999px;
}
.meta {
  margin-top: auto;
  color: var(--text-sub);
  font-size: .84rem;
  font-weight: 500;
}
.dot { margin: 0 6px; opacity: .55; }
.empty { text-align: center; color: var(--text-sub); padding: 48px 0; }

/* ---------- post ---------- */
.post {
  max-width: var(--readw);
  margin: 0 auto;
  padding: 40px 0 8px;
}
.back-top {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--text-sub);
  text-decoration: none;
  font-weight: 600;
  font-size: .9rem;
}
.back-top:hover { color: var(--blue); }
.post-title {
  margin: 14px 0 14px;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: 0;
  color: var(--text);
}
.post .meta { margin: 0 0 8px; }
.post .content {
  margin-top: 34px;
  font-size: 1.05rem;
  color: var(--text-body);
}
.post .content > :first-child { margin-top: 0; }
.post .content h2 {
  margin: 2em 0 .6em;
  font-size: 1.42rem;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--text);
  line-height: 1.4;
}
.post .content h3 {
  margin: 1.6em 0 .5em;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--text);
}
.post .content p { margin: 1em 0; }
.post .content ul, .post .content ol { padding-left: 1.3em; margin: 1em 0; }
.post .content li { margin: .4em 0; }
.post .content a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid color-mix(in srgb, var(--blue) 35%, transparent);
}
.post .content a:hover { border-bottom-color: var(--blue); }
.post .content strong { font-weight: 700; color: var(--text); }
.post .content hr { border: none; border-top: 1px solid var(--border); margin: 2.4em 0; }
.post .content blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  border-left: 3px solid var(--blue);
  background: var(--grey100);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-sub);
}
@media (prefers-color-scheme: dark) { .post .content blockquote { background: #24262C; } }
.post .content blockquote p { margin: .4em 0; }

/* resume */
.resume-head {
  margin-bottom: 2.2rem;
}
.resume-head h1 {
  margin: 0 0 .2rem;
  font-size: clamp(2rem, 4.8vw, 2.7rem);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--text);
}
.resume-role {
  margin: 0 0 1rem;
  color: var(--text-sub);
  font-size: 1.08rem;
  font-weight: 650;
}
.resume-contact {
  margin: 0 0 1.8rem;
  color: var(--text-body);
  line-height: 1.8;
}
.resume-head h2 {
  margin-top: 0;
}
.resume-summary {
  margin: .8rem 0 0;
}
.resume-summary div {
  display: grid;
  grid-template-columns: 136px 1fr;
  gap: 14px;
  padding: 7px 0;
}
.resume-summary dt {
  color: var(--text-sub);
  font-weight: 700;
}
.resume-summary dd {
  margin: 0;
  color: var(--text-body);
}

/* tables */
.post .content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: .92rem;
  display: block;
  overflow-x: auto;
}
.post .content th, .post .content td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}
.post .content th { background: var(--grey100); font-weight: 700; color: var(--text); }
@media (prefers-color-scheme: dark) { .post .content th { background: #24262C; } }

/* code */
.post .content code {
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88em;
  background: var(--inline-code-bg);
  color: var(--text);
  padding: 2px 7px;
  border-radius: 6px;
}
.post .content pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1.5em 0;
  font-size: .875rem;
  line-height: 1.62;
}
.post .content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 1em;
}

.back {
  display: inline-block;
  margin-top: 40px;
  padding: 12px 22px;
  color: var(--blue);
  background: var(--tint);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  font-size: .92rem;
  transition: background .16s;
}
.back:hover { background: color-mix(in srgb, var(--blue) 16%, var(--tint)); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--border-soft); margin-top: 24px; }
.foot-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 44px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text-sub);
  font-size: .86rem;
  line-height: 1.7;
}
.foot p { margin: 0; }
.foot-about { color: var(--text); font-weight: 650; }
.foot-stack { color: var(--grey600); }
.foot-stack strong {
  margin-right: 8px;
  color: var(--blue);
  font-weight: 750;
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .post-list { grid-template-columns: 1fr; }
  .hero { padding: 48px 2px 28px; }
  .wrap { padding: 0 18px 56px; }
  .nav-inner { padding: 12px 18px; }
  .card { padding: 22px 22px 20px; }
}

@media (max-width: 520px) {
  .nav-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
  .links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }
  .links a {
    padding: 6px 10px;
    font-size: .86rem;
  }
  .resume-summary div {
    grid-template-columns: 1fr;
    gap: 2px;
    padding: 8px 0;
  }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .card:hover { transform: none; }
}