@font-face {
  font-family: "Zen Serif";
    src: url('./assets/fonts/ZEN-SERIF-TTF-Regular.ttf') format('truetype');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;

  /* ---- Base ---------------------------------------------------- */
  --bg: #f5f4f2;         /* 전체 배경: 차가운 흰색 대신 살짝 종이 느낌 */
  --panel: #fcfcfb;      /* 카드/패널: 배경보다 아주 살짝 밝게 */
  --ink: #111111;        /* 본문 텍스트: 완전 블랙보다 눈 덜 아픈 잉크 블랙 */
  --muted: #6b6b6b;      /* 보조 텍스트, 메타 정보 */

  /* ---- Accents ------------------------------------------------- */
  --accent: #151515;         /* 링크, 아이콘 기본 색 (거의 블랙) */
  --title-accent: #252a32;   /* 제목 색: 아주 살짝 푸른기 도는 차콜 */
  --border: #e0ded7;         /* 구분선, 카드 보더 */
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.07);

  /* ---- Optional subtilities ----------------------------------- */
  --ink-soft: #8a8a8a;       /* 캡션, 날짜 등 더 약한 텍스트 */
  --accent-soft: #f0eeea;    /* 호버 배경, 태그 pill 배경 등 */
  --pinned-bg: #f9f3e5;      /* 고정된 포스트 배경 */
  --accent-strong: #000000;  /* 정말 강조해야 하는 포인트 (버튼 텍스트 등) */

  /* ---- Typography --------------------------------------------- */
  --serif: "Zen Serif", "Pretendard", "Inter", system-ui, -apple-system, serif;
  --sans: "Zen Serif", "Pretendard", "Inter", system-ui, -apple-system, serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

  --step--1: 0.95rem;
  --step-0: 1rem;
  --step-1: 1.15rem;
  --step-2: clamp(1.35rem, 2.6vw, 1.6rem);
  --step-3: clamp(1.6rem, 3vw, 1.9rem);
  --step-4: clamp(2.1rem, 3.6vw, 2.5rem);

  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
  letter-spacing: -0.01em;
  word-break: keep-all;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(16, 16, 16, 0.35);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.28em;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

a:hover,
a:focus-visible {
  color: #000;
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 2px solid rgba(16, 16, 16, 0.3);
  outline-offset: 3px;
}

p {
  margin: 0 0 1.25rem;
}

h1,
h2,
h3,
h4 {
  font-family: var(--sans);
  margin: 0 0 0.75rem;
  line-height: 1.28;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 {
  font-size: var(--step-4);
}

h2 {
  font-size: var(--step-3);
  font-weight: 600;
}

h3 {
  font-size: var(--step-2);
  font-weight: 600;
}

h4 {
  font-size: var(--step-1);
  letter-spacing: 0.02em;
  color: var(--muted);
}

ul,
ol {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

blockquote {
  margin: 1rem 0 0.75rem;
  padding: 0.5rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-style: italic;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
}

.brand {
  display: flex;
  text-decoration: none;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

.brand-mark {
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  gap: 1.1rem;
  font-family: var(--sans);
  font-size: 0.98rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.2rem;
}

.site-nav a[aria-current="page"],
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
}

main {
  padding: 3.5rem 0 4rem;
}

.post-grid .loading {
  color: var(--muted);
}

.hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
}

.hero .container {
  width: min(960px, 92vw);
}

.lede {
  max-width: 38ch;
  margin: 0 0 1.4rem;
  font-family: var(--sans);
  font-size: var(--step-1);
  line-height: 1.6;
}

.eyebrow {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.hero-summary {
  display: grid;
  gap: 1rem;
  max-width: 72ch;
  color: var(--muted);
  font-size: 1.02rem;
}

.hero-tagline {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.95rem;
}

.profile {
  padding: 2.5rem 0 0;
}

.profile > .container {
  width: min(960px, 92vw);
  display: grid;
  gap: 2.5rem;
}

.profile-section {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  display: grid;
  gap: 1rem;
}

.profile-section:first-of-type {
  border-top: none;
}

.section-title {
  margin: 0;
}

.section-content {
  margin: 0;
  color: var(--muted);
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.link-list a {
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.15rem;
}

.link-list a:hover,
.link-list a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.note-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #f6f6f6;
}

.site-footer .container {
  padding: 1.5rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--muted);
}

/* === About page === */

.about-page main {
  padding-top: 3rem;
}

.about-hero {
  padding: 1rem 0 2.5rem;
}

.about-hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.about-name {
  font-family: var(--sans);
  font-size: clamp(2rem, 4vw, 2.6rem);
}

.about-role {
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.about-contact-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  gap: 0.8rem 1.25rem;
  flex-wrap: wrap;
  font-family: var(--sans);
  color: var(--muted);
}

.about-contact-list a {
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--border);
}

.about-contact-list a:hover,
.about-contact-list a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.about-intro {
  max-width: 70ch;
  color: var(--muted);
  display: grid;
  gap: 0.9rem;
}

.about-content {
  width: min(900px, 92vw);
  margin: 0 auto;
  display: grid;
  gap: 2.5rem;
}

.about-notes {
  display: grid;
  gap: 1.25rem;
}

.about-notes h2 {
  margin-bottom: 0.35rem;
}

.resume-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  display: grid;
  gap: 0.35rem;
}

.resume-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem 1.35rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  color: var(--muted);
}

.resume-card h3 {
  margin: 0 0 0.5rem;
}

.resume-card p {
  margin: 0 0 0.5rem;
}

/* === Post collection (grid) === */

.post-collection {
  padding: 2.5rem 0 4rem;
}

.collection-header {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.collection-intro {
  display: grid;
  gap: 0.55rem;
  max-width: 70ch;
}

.post-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  height: 100%;
  overflow: hidden;
  font-size: var(--step--1);
}

.post-card-link {
  display: grid;
  gap: 0.6rem;
  padding: 1.35rem 1.6rem;
  height: 100%;
  color: inherit;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 14px;
  transition: transform 200ms ease-out, box-shadow 200ms ease-out;
}

.post-card:hover .post-card-link,
.post-card:focus-within .post-card-link {
  transform: translateY(-3px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.09);
}

.post-card.is-pinned .post-card-link {
  background: var(--pinned-bg);
}

.post-card-media {
  background: #f7f2e9;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.post-card-thumb {
  width: 100%;
  height: 200px;
  object-fit: contain;
  display: block;
  background: linear-gradient(135deg, #fffaf2, #f5ecdf);
}

.post-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
  font-size: var(--step--1);
}

.post-card-category {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.02em;
  max-width: 100%;
  white-space: normal;
  line-height: 1.2;
}

.post-card-date {
  color: var(--muted);
  font-size: 0.88rem;
}

.post-card-title {
  margin: 0;
  font-size: var(--step-1);
  color: var(--title-accent);
}

.post-card-description {
  margin: 0;
  font-size: var(--step--1);
  color: var(--muted);
}

.post-card-footer {
  display: flex;
  justify-content: flex-end;
}

/* === Posts === */

.post {
  padding: 1.5rem 0 4rem;
}

.post-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.32fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: start;
}

.post-archive {
  position: sticky;
  top: 6rem;
  align-self: start;
  display: grid;
  gap: 0.75rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.archive-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.archive-header p {
  color: var(--muted);
  margin: 0.35rem 0 0;
}

.archive-toggle {
  display: none;
  border: 1px solid var(--border);
  background: #f3f2ef;
  color: var(--ink);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  font-weight: 600;
}

.post-list {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.category-group {
  display: grid;
  gap: 0.4rem;
  padding: 0.2rem 0 0.5rem;
  border-top: 1px solid var(--border);
}

.category-group:first-of-type {
  border-top: none;
  padding-top: 0;
}

.category-title {
  font-family: var(--sans);
  font-size: 1.2rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  /* color: var(--muted); */
  margin: 0;
}

.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.category-list-item {
  list-style: none;
}

.post-link {
  font-family: var(--sans);
  font-size: 0.98rem;
  text-align: left;
  background: none;
  border: 1px solid var(--border);
  padding: 0.65rem 0.75rem;
  color: var(--ink);
  border-radius: 12px;
  cursor: pointer;
  display: grid;
  gap: 0.2rem;
}

.post-link-title {
  font-weight: 600;
}

.post-link-meta {
  font-size: var(--step--2);
  color: var(--muted);
}

.post-list .is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0, 102, 255, 0.04);
}

.post-viewer {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow);
}

.post-header {
  margin-bottom: 1.5rem;
  padding-top: 0.4rem;
}

.post-header::before {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  background: var(--title-accent);
  border-radius: 999px;
  opacity: 0.18;
  margin-bottom: 1rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: baseline;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.6rem;
}

.post-category {
  color: var(--accent);
  font-weight: 700;
}

.post-title {
  color: var(--title-accent);
  font-size: clamp(1.95rem, 3.6vw, 2.6rem);
  letter-spacing: -0.03em;
  margin: 0;
}

.separator {
  opacity: 0.6;
}

.post-body {
  font-size: 1.04rem;
  color: var(--ink);
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.post-body h1:first-of-type {
  display: none;
}

.mermaid-diagram {
  margin: 1.5rem 0;
  background: #f5f5f5;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  overflow-x: auto;
}

.post-body h2,
.post-body h3,
.post-body h4 {
  margin-top: 2.2rem;
}

.post-body img {
  border-radius: 12px;
  border: 1px solid var(--border);
}

.post-body pre {
  background: #f3f4f6;
  border: 1px solid #d9d9df;
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.95rem;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.08);
}

.post-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.post-body code {
  font-family: var(--mono);
  background: #eceff3;
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
}

@media (max-width: 960px) {
  .post-layout {
    grid-template-columns: 1fr;
  }

  .post-archive {
    position: static;
  }

  .archive-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
  }

  .post-archive.is-collapsed .post-list {
    display: none;
  }
}

.post-body table {
  width: 100%;
  margin: 1.4rem 0;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.post-body th,
.post-body td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.post-body tr:last-child td,
.post-body tr:last-child th {
  border-bottom: none;
}

/* === Career & portfolio (archived) === */

.career-page main,
.portfolio-page main {
  padding: 3rem 0 4rem;
}

.career-summary {
  border-block: 1px solid var(--border);
  padding: 2.5rem 0;
  background: linear-gradient(135deg, rgba(16, 16, 16, 0.05), rgba(255, 255, 255, 0));
}

.career-summary .container {
  width: min(860px, 92vw);
  display: grid;
  gap: 1rem;
}

.career-master .container,
.portfolio-section .container {
  width: min(860px, 92vw);
  display: grid;
  gap: 1.75rem;
}

.career-block,
.portfolio-item {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
  display: grid;
  gap: 1rem;
}

.career-stack {
  margin: 0;
  padding: 0.75rem 1rem;
  background: #f4f4f4;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--muted);
  font-family: var(--sans);
}

.career-highlight-grid {
  display: grid;
  gap: 1rem;
}

.career-highlight {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f7f7f7;
}

.activity-list,
.resume-list,
.portfolio-item ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}

/* === Utilities === */

.callout {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--muted);
  margin: 1rem 0;
}

@media (max-width: 900px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    font-size: 0.96rem;
  }

  .hero {
    padding: 2.75rem 0 2rem;
  }

  .hero .container {
    width: min(960px, 94vw);
  }

  .lede {
    max-width: 42ch;
  }

  .profile > .container {
    gap: 1.75rem;
  }

  .profile-section {
    padding: 1.25rem 0;
  }

  .post-layout {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }

  .post-viewer {
    padding: 1.2rem 1.3rem;
    border-radius: 16px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 0.98rem;
    line-height: 1.65;
  }

  main {
    padding-top: 2.5rem;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .site-header .container {
    padding: 1rem 0;
  }

  .site-nav {
    width: 100%;
  }

  .about-contact-list {
    flex-direction: column;
    align-items: flex-start;
  }

  .post-meta {
    font-size: 0.86rem;
    letter-spacing: 0.04em;
  }

  .post-title {
    font-size: clamp(1.7rem, 5.5vw, 2.2rem);
  }

  .post-body {
    font-size: 1rem;
  }
}