:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f7f7f7;
  --text: #111111;
  --muted: #6b6b6b;
  --border: #e9e9e9;
  --accent: #2563eb;
  --accent-weak: rgba(37, 99, 235, 0.16);
  --topbar-bg: rgba(255, 255, 255, 0.82);

  --radius: 14px;
  --page-width: 920px;
  --content-padding: 24px;
  --topbar-h: 56px;

  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Noto Sans KR", "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New",
    monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0b;
    --surface: #0f0f10;
    --surface-2: #151516;
    --text: #f3f3f3;
    --muted: #a6a6a6;
    --border: #262626;
    --accent: #7aa2ff;
    --accent-weak: rgba(122, 162, 255, 0.2);
    --topbar-bg: rgba(11, 11, 11, 0.78);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.62;
  letter-spacing: -0.01em;
}

::selection {
  background: var(--accent-weak);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a[aria-disabled="true"] {
  pointer-events: none;
  opacity: 0.6;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 10px;
}

.skip-link {
  position: absolute;
  top: 10px;
  left: -9999px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  z-index: 999;
}

.skip-link:focus {
  left: 12px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.topbar__inner {
  max-width: var(--page-width);
  height: var(--topbar-h);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  user-select: none;
}

.brand:hover {
  background: var(--surface-2);
  text-decoration: none;
}

.brand__icon {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: var(--text);
  color: var(--bg);
  font-weight: 800;
  font-size: 14px;
}

.brand__text {
  font-weight: 700;
  font-size: 14px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav a {
  flex: 0 0 auto;
  padding: 8px 10px;
  border-radius: 12px;
  color: var(--muted);
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
}

.nav a:hover {
  background: var(--surface-2);
  color: var(--text);
}

.page {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: calc(var(--topbar-h) + 22px) var(--content-padding) 72px;
}

.hero {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 18px;
}

.hero__avatar {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  position: relative;
  border-radius: 50%;
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.hero__avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero__avatar-fallback {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  background: var(--surface-2);
}

.hero__title {
  margin: 0;
  font-size: 40px;
  line-height: 1.16;
}

.hero__lead {
  margin: 10px 0 0;
  max-width: 66ch;
  color: var(--muted);
}

.hero__meta {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-weight: 700;
  font-size: 12px;
}

.dot {
  color: var(--muted);
}

.actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
}

.btn:hover {
  background: var(--surface-2);
  text-decoration: none;
}

.btn--primary {
  background: var(--text);
  color: var(--bg);
  border-color: transparent;
}

.btn--primary:hover {
  opacity: 0.92;
  background: var(--text);
}

.note {
  margin-top: 16px;
  padding: 12px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
  display: flex;
  gap: 10px;
  align-items: baseline;
}

h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.25;
}

h3 {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.25;
  color: var(--muted);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

p {
  margin: 0 0 12px;
}

.muted {
  color: var(--muted);
}

.block {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.callout {
  margin-top: 16px;
  padding: 14px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
}

.callout__title {
  font-weight: 800;
}

.callout__line {
  margin: 0 0 6px;
}

.callout__line:last-child {
  margin-bottom: 0;
}

.props {
  margin: 18px 0 0;
}

.props__row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.props__row:last-child {
  border-bottom: 0;
}

dt {
  font-weight: 700;
  color: var(--muted);
}

dd {
  margin: 0;
}

.stack {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.stack__group {
  padding: 14px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.stack__title {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 13px;
  font-weight: 650;
}

.tags--sm {
  gap: 6px;
}

.tag--sm {
  font-size: 12px;
  padding: 4px 8px;
}

.rows {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
}

.row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 14px;
  border-top: 1px solid var(--border);
}

.row:first-child {
  border-top: 0;
}

.row:hover {
  background: var(--surface-2);
}

.row__main {
  min-width: 0;
  flex: 1 1 auto;
}

.row__title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.row__sub {
  font-size: 13px;
}

.row__desc {
  margin: 8px 0 10px;
  color: var(--muted);
}

.row__side {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.link {
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 10px;
}

.link:hover {
  text-decoration: none;
  background: var(--accent-weak);
}

.timeline {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
}

.timeline__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 14px 14px;
  border-top: 1px solid var(--border);
}

.timeline__item:first-child {
  border-top: 0;
}

.timeline__desc {
  margin: 8px 0 10px;
  color: var(--muted);
}

.bullets {
  margin: 0;
  padding-left: 18px;
}

.bullets li {
  margin: 6px 0;
}

.contact {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.contact__item {
  padding: 12px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact__item:hover {
  background: var(--surface-2);
  text-decoration: none;
}

.contact__label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.contact__value {
  font-weight: 750;
  word-break: break-word;
}

.footer {
  padding-top: 26px;
}

.footer__inner {
  padding: 20px 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

@media (max-width: 820px) {
  .hero__title {
    font-size: 34px;
  }

  .stack {
    grid-template-columns: 1fr;
  }

  .timeline__item {
    grid-template-columns: 1fr;
  }

  .timeline__when {
    font-weight: 700;
  }
}

@media (max-width: 640px) {
  :root {
    --content-padding: 18px;
  }

  .topbar__inner {
    padding: 0 14px;
  }

  .hero {
    gap: 12px;
  }

  .hero__avatar {
    width: 48px;
    height: 48px;
  }

  .hero__avatar-fallback {
    font-size: 20px;
  }

  .hero__title {
    font-size: 30px;
  }

  .callout,
  .props__row {
    grid-template-columns: 1fr;
  }

  .contact {
    grid-template-columns: 1fr;
  }

  .row {
    flex-direction: column;
  }

  .row__side {
    width: 100%;
    justify-content: flex-start;
  }
}

/* Markdown Content Styles */
.markdown-content {
  line-height: 1.7;
}

.markdown-content h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 32px 0 16px;
  line-height: 1.2;
}

.markdown-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 28px 0 12px;
  line-height: 1.3;
}

.markdown-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 24px 0 10px;
  line-height: 1.4;
}

.markdown-content h4 {
  font-size: 18px;
  font-weight: 700;
  margin: 20px 0 8px;
}

.markdown-content p {
  margin: 16px 0;
}

.markdown-content ul,
.markdown-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.markdown-content li {
  margin: 8px 0;
}

.markdown-content code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.markdown-content pre {
  margin: 20px 0;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--surface-2);
  border: 1px solid var(--border);
  overflow-x: auto;
}

.markdown-content pre code {
  display: block;
  padding: 0;
  background: none;
  border: none;
  font-size: 0.9em;
  line-height: 1.6;
}

.markdown-content blockquote {
  margin: 20px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.markdown-content blockquote p {
  margin: 0;
  color: var(--muted);
}

.markdown-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.markdown-content a:hover {
  text-decoration: none;
}

.markdown-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 20px 0;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.markdown-content th,
.markdown-content td {
  padding: 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.markdown-content th {
  background: var(--surface-2);
  font-weight: 700;
}

.markdown-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.markdown-content strong {
  font-weight: 700;
}

.markdown-content em {
  font-style: italic;
}