:root {
  --surface-primary: #ffffff;
  --surface-canvas: #f2f4f6;
  --surface-muted: #e8f3ff;
  --surface-strong: #1b64da;
  --text-primary: #191f28;
  --text-secondary: #4e5968;
  --text-muted: #667085;
  --border-default: #e5e8eb;
  --accent-primary: #1b64da;
  --accent-hover: #0f55c2;
  --focus-ring: #1b64da;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --content-width: 75rem;
  --type-display: clamp(2.55rem, 6vw, 4.75rem);
  --type-h1: clamp(2rem, 4vw, 3.5rem);
  --type-h2: 1.65rem;
  --type-h3: 1.15rem;
  --type-lead: 1.125rem;
  --type-body: 1rem;
  --type-small: 0.875rem;
  --type-overline: 0.75rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--surface-canvas); color: var(--text-secondary); font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", system-ui, sans-serif; font-size: var(--type-body); line-height: 1.7; word-break: keep-all; }
a { color: var(--accent-primary); text-underline-offset: 0.22em; }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible { outline: 0.2rem solid var(--focus-ring); outline-offset: 0.2rem; }
button { font: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3, strong, .wordmark { color: var(--text-primary); }
.shell { width: min(calc(100% - var(--space-10)), var(--content-width)); margin: 0 auto; }
.skip-link { position: fixed; z-index: 10; top: var(--space-3); left: var(--space-3); padding: var(--space-3) var(--space-4); background: var(--surface-primary); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; z-index: 5; top: 0; border-bottom: 1px solid var(--border-default); background: color-mix(in srgb, var(--surface-primary) 94%, transparent); backdrop-filter: blur(0.5rem); }
.header-inner { display: flex; min-height: 4.5rem; align-items: center; justify-content: space-between; gap: var(--space-6); }
.wordmark { font-size: var(--type-h3); font-weight: 700; text-decoration: none; }
#site-nav { display: flex; gap: var(--space-6); }
#site-nav a { font-size: var(--type-small); font-weight: 700; text-decoration: none; }
.menu-button { display: none; border: 1px solid var(--border-default); background: var(--surface-primary); color: var(--text-primary); padding: var(--space-2) var(--space-3); }
.hero { padding: var(--space-10) 0 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(16rem, 0.45fr); min-height: min(39rem, calc(100dvh - 5rem)); overflow: hidden; border-radius: 2rem; background: var(--surface-primary); box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.04); }
.hero-copy { display: flex; flex-direction: column; justify-content: center; padding: var(--space-24) var(--space-16); }
.eyebrow { color: var(--text-muted); font-size: var(--type-overline); font-weight: 700; letter-spacing: 0.14em; }
.hero h1 { margin: var(--space-6) 0; font-size: var(--type-display); font-weight: 800; letter-spacing: -0.05em; line-height: 1.16; }
.hero-lead { max-width: 32rem; font-size: var(--type-lead); }
.text-link { width: fit-content; margin-top: var(--space-10); border-radius: 1rem; background: var(--surface-strong); color: var(--surface-primary); padding: var(--space-4) var(--space-6); font-weight: 700; text-decoration: none; }
.text-link:hover { background: var(--accent-hover); color: var(--surface-primary); }
.achievement-rail { display: flex; flex-direction: column; justify-content: center; gap: var(--space-8); background: var(--surface-strong); padding: var(--space-12) var(--space-8); }
.achievement-rail div { border-bottom: 1px solid color-mix(in srgb, var(--surface-primary) 35%, transparent); padding-bottom: var(--space-5); }
.achievement-rail strong, .project-result strong { display: block; font-size: clamp(3rem, 5vw, 5rem); font-weight: 800; line-height: 1; }
.achievement-rail strong, .achievement-rail span { color: var(--surface-primary); }
.achievement-rail span, .project-result span { font-size: var(--type-small); }
.strengths { padding: var(--space-20) 0; }
.section-heading { margin-bottom: var(--space-10); }
.section-heading h2, .detail-heading h2, .contact h2 { margin-top: var(--space-2); font-size: var(--type-h1); letter-spacing: -0.04em; line-height: 1.14; }
.strength-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.strength-grid article { border-radius: 1.5rem; background: var(--surface-primary); padding: var(--space-6); box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.04); }
.strength-grid article:first-child { padding-left: var(--space-6); }
.strength-grid span { color: var(--accent-primary); font-size: var(--type-h2); font-weight: 800; }
.strength-grid h3 { margin: var(--space-2) 0; font-size: var(--type-h2); }
.section { padding: var(--space-24) 0; }
section[id] { scroll-margin-top: 5.5rem; }
.section-heading-row { display: flex; align-items: end; justify-content: space-between; gap: var(--space-6); }
.section-heading-row > p { max-width: 20rem; color: var(--text-muted); font-size: var(--type-small); text-align: right; }
.project-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); }
.project-card { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: var(--space-5); border-radius: 1.5rem; background: var(--surface-primary); padding: var(--space-6); box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.04); transition: box-shadow 150ms ease-out, transform 150ms ease-out; }
.project-card:hover { box-shadow: 0 0.75rem 2rem rgba(0, 0, 0, 0.08); transform: translateY(-0.2rem); }
.project-index { display: grid; width: 2.25rem; height: 2.25rem; place-items: center; border-radius: 50%; background: var(--surface-muted); color: var(--accent-primary); font-size: var(--type-small); font-weight: 800; }
.project-meta { color: var(--text-muted); font-size: var(--type-small); }
.project-card h3 { margin: var(--space-1) 0; font-size: var(--type-h2); letter-spacing: -0.03em; line-height: 1.25; }
.project-card p:not(.project-meta) { font-size: var(--type-small); }
.project-result { align-self: center; min-width: 7.25rem; border-radius: 1rem; background: var(--surface-muted); padding: var(--space-3); text-align: center; }
.project-result strong { color: var(--accent-primary); font-size: clamp(2.4rem, 4vw, 4.2rem); }
.project-card a { grid-column: 2 / -1; width: fit-content; font-size: var(--type-small); font-weight: 700; }
.project-details { padding: var(--space-10) 0; }
.detail { scroll-margin-top: 5.5rem; margin: var(--space-6) 0; border-radius: 2rem; background: var(--surface-primary); padding: var(--space-16); box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.04); }
.detail-heading { max-width: 60rem; }
.detail-heading > p:last-child { margin-top: var(--space-3); color: var(--text-muted); }
.detail-content { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr); gap: var(--space-10); margin-top: var(--space-10); }
.detail-content img { aspect-ratio: 16 / 9; border-radius: 1.25rem; object-fit: cover; object-position: top; }
.detail-content dl { display: grid; gap: var(--space-5); margin: 0; }
.detail-content dl div { border-top: 1px solid var(--border-default); padding-top: var(--space-3); }
.detail-content dt { color: var(--text-primary); font-weight: 700; }
.detail-content dd { margin: var(--space-1) 0 0; }
.muted-section { background: transparent; }
.two-column { display: grid; grid-template-columns: minmax(12rem, 0.55fr) minmax(0, 1.45fr); gap: var(--space-12); }
.timeline { display: grid; gap: var(--space-6); list-style: none; margin: 0; padding: 0; }
.timeline li { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: var(--space-5); border-radius: 1.25rem; background: var(--surface-primary); padding: var(--space-5); }
.timeline time { color: var(--text-muted); font-size: var(--type-small); font-weight: 700; }
.timeline h3, .skill-list h3 { font-size: var(--type-h3); }
.skill-list { display: grid; gap: var(--space-5); }
.skill-list div { border-radius: 1.25rem; background: var(--surface-primary); padding: var(--space-5); }
.skill-list p { margin-top: var(--space-1); }
.contact { padding: var(--space-24) 0; }
.contact .shell { border-radius: 2rem; background: var(--surface-strong); padding: var(--space-16); }
.contact h2, .contact .eyebrow, .contact-action > p { color: var(--surface-primary); }
.contact-inner { display: flex; align-items: end; justify-content: space-between; gap: var(--space-10); }
.contact-action { max-width: 23rem; }
.contact-action a { display: inline-block; margin-top: var(--space-4); color: var(--surface-primary); font-weight: 700; }
.site-footer { padding: var(--space-5) 0; font-size: var(--type-small); }
.site-footer .shell { display: flex; justify-content: space-between; gap: var(--space-4); }

@media (max-width: 64rem) {
  .hero-grid { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { padding-right: 0; }
  .achievement-rail { display: grid; grid-template-columns: repeat(3, 1fr); padding: var(--space-6); }
  .achievement-rail div { border-bottom: 0; border-left: 1px solid color-mix(in srgb, var(--surface-primary) 35%, transparent); padding: 0 var(--space-4); }
  .achievement-rail div:first-child { border-left: 0; padding-left: 0; }
  .achievement-rail strong { font-size: var(--type-h1); }
}

@media (max-width: 44rem) {
  .shell { width: min(calc(100% - var(--space-10)), var(--content-width)); }
  .header-inner { flex-wrap: wrap; padding: var(--space-3) 0; }
  .menu-button { display: block; }
  #site-nav { display: grid; width: 100%; gap: var(--space-3); border-top: 1px solid var(--border-default); padding-top: var(--space-3); }
  #site-nav[hidden] { display: none; }
  .hero { padding-top: var(--space-4); }
  .hero-grid, .detail, .contact .shell { border-radius: 1.5rem; }
  .hero-copy { padding: var(--space-16) var(--space-6); }
  .section, .strengths, .detail, .contact { padding-top: var(--space-16); padding-bottom: var(--space-16); }
  .hero h1 { letter-spacing: -0.045em; }
  .achievement-rail { grid-template-columns: 1fr; gap: var(--space-4); }
  .achievement-rail div, .achievement-rail div:first-child { border-left: 0; border-bottom: 1px solid color-mix(in srgb, var(--surface-primary) 35%, transparent); padding: 0 0 var(--space-3); }
  .strength-grid, .project-grid, .detail-content, .two-column { grid-template-columns: 1fr; }
  .strength-grid { gap: var(--space-6); }
  .strength-grid article, .strength-grid article:first-child { padding: var(--space-5); }
  .section-heading-row, .contact-inner { display: grid; align-items: start; }
  .section-heading-row > p { text-align: left; }
  .project-card { grid-template-columns: auto minmax(0, 1fr); }
  .project-result { grid-column: 2; text-align: left; }
  .project-card a { grid-column: 2; }
  .timeline li { grid-template-columns: 1fr; gap: var(--space-1); }
  .site-footer .shell { display: grid; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}