:root {
  --paper: #f7f3e8;
  --paper-strong: #fffaf0;
  --ink: #17201c;
  --muted: #5b635f;
  --line: #d9d0bf;
  --teal: #0b6b57;
  --blue: #3478a4;
  --amber: #f1b84b;
  --red: #e4552d;
  --steel: #243633;
  --shadow: 0 24px 70px rgba(23, 32, 28, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23, 32, 28, 0.06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(23, 32, 28, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 56px 56px;
  font-family: "IBM Plex Sans KR", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(23, 32, 28, 0.12);
  background: rgba(247, 243, 232, 0.86);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--amber);
  font-size: 0.82rem;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.95rem;
  font-weight: 600;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover,
.repo-table a:hover span,
.project-card a:hover {
  color: var(--teal);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: clamp(32px, 6vw, 76px);
  align-items: center;
  min-height: calc(100vh - 78px);
  padding: clamp(44px, 6vw, 84px) clamp(20px, 5vw, 72px) clamp(40px, 6vw, 70px);
}

.hero-copy {
  max-width: 880px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
  word-break: keep-all;
}

h1,
h2 {
  margin: 0;
  font-family: "Gowun Batang", serif;
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 980px;
  font-size: clamp(2.8rem, 5.6vw, 5.25rem);
}

h2 {
  font-size: clamp(2.2rem, 5vw, 4.8rem);
}

h3 {
  margin: 0;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.35;
}

.hero-lead {
  max-width: 760px;
  margin: 28px 0 0;
  color: var(--steel);
  font-size: clamp(1.02rem, 1.5vw, 1.24rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  background: var(--paper-strong);
  box-shadow: 4px 4px 0 var(--ink);
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.button.primary {
  background: var(--red);
  color: white;
}

.signal-panel {
  position: relative;
  display: grid;
  gap: 20px;
  padding: 20px;
  border: 2px solid var(--ink);
  background:
    linear-gradient(135deg, rgba(11, 107, 87, 0.13), transparent 45%),
    var(--paper-strong);
  box-shadow: var(--shadow);
}

.signal-panel::before {
  content: "";
  position: absolute;
  inset: 14px;
  pointer-events: none;
  border: 1px dashed rgba(23, 32, 28, 0.24);
}

.avatar {
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: grayscale(18%) contrast(1.04);
}

.metric-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.metric-grid div {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 250, 240, 0.86);
}

.metric-grid dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.metric-grid dd {
  margin: 4px 0 0;
  color: var(--teal);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1;
}

.focus-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--steel);
  color: white;
}

.focus-band article {
  min-width: 0;
  padding: clamp(28px, 5vw, 56px);
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

.focus-band article:last-child {
  border-right: 0;
}

.focus-index {
  display: block;
  margin-bottom: 36px;
  color: var(--amber);
  font-weight: 800;
}

.focus-band h2 {
  margin-bottom: 14px;
  font-family: "IBM Plex Sans KR", sans-serif;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
}

.focus-band p {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
}

.section {
  padding: clamp(70px, 10vw, 126px) clamp(20px, 5vw, 72px);
}

.section-heading {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.case-list {
  display: grid;
  gap: 18px;
}

.case-study,
.project-card,
.stack-layout article {
  border: 1px solid var(--ink);
  background: rgba(255, 250, 240, 0.92);
}

.case-study {
  display: grid;
  gap: 20px;
  padding: clamp(24px, 4vw, 44px);
}

.case-study.highlight {
  border-width: 2px;
  background:
    linear-gradient(90deg, rgba(241, 184, 75, 0.24), transparent 36%),
    var(--paper-strong);
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.case-meta span {
  padding: 5px 8px;
  border-left: 4px solid var(--red);
  background: rgba(23, 32, 28, 0.05);
}

.case-study p,
.project-card p,
.stack-layout p,
.contact-section p {
  margin: 0;
  color: var(--steel);
}

.impact-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.impact-list li {
  min-width: 0;
  padding: 14px;
  border-top: 4px solid var(--teal);
  background: rgba(11, 107, 87, 0.08);
  font-weight: 700;
}

.split-section {
  background: rgba(23, 32, 28, 0.045);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.project-card {
  display: grid;
  align-content: start;
  gap: 16px;
  min-height: 330px;
  padding: 22px;
}

.project-type {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.project-card a {
  align-self: end;
  color: var(--ink);
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.repo-table {
  display: grid;
  border-top: 2px solid var(--ink);
}

.repo-table a {
  display: grid;
  grid-template-columns: minmax(180px, 1.2fr) minmax(100px, 0.5fr) minmax(220px, 1.3fr);
  gap: 18px;
  align-items: center;
  min-height: 72px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.repo-table span {
  font-weight: 800;
}

.repo-table strong {
  color: var(--red);
}

.repo-table em {
  color: var(--muted);
  font-style: normal;
}

.stack-section {
  background: var(--paper-strong);
}

.stack-layout {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stack-layout article {
  padding: 22px;
}

.stack-layout h3 {
  margin-bottom: 14px;
  color: var(--teal);
}

.contact-section {
  padding: clamp(76px, 10vw, 136px) clamp(20px, 5vw, 72px);
  background: var(--teal);
  color: white;
}

.contact-section h2 {
  max-width: 980px;
}

.contact-section p {
  max-width: 760px;
  margin-top: 24px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.1rem;
}

.contact-section .eyebrow {
  color: var(--amber);
}

.contact-section .button {
  border-color: white;
  color: var(--ink);
  box-shadow: 4px 4px 0 white;
}

.contact-section .button.primary {
  color: white;
}

.contact-section .button:hover {
  box-shadow: 2px 2px 0 white;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(20px, 5vw, 72px);
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.94rem;
}

.site-footer a {
  color: white;
}

.policy-page {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(48px, 8vw, 92px) 20px;
  background: var(--paper);
}

.policy-page h1 {
  font-size: clamp(2.4rem, 6vw, 4.6rem);
}

.policy-page h2 {
  margin-top: 38px;
  font-family: "IBM Plex Sans KR", sans-serif;
  font-size: 1.4rem;
}

.policy-page p {
  color: var(--steel);
}

@media (max-width: 1080px) {
  .hero,
  .project-grid,
  .stack-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-copy {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
    gap: 12px;
  }

  .hero,
  .focus-band,
  .project-grid,
  .stack-layout,
  .impact-list {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: clamp(2.2rem, 11vw, 3.5rem);
  }

  h2 {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .focus-band article {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .focus-band article:last-child {
    border-bottom: 0;
  }

  .repo-table a {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-copy,
  .signal-panel,
  .case-study,
  .project-card,
  .repo-table a {
    animation: rise-in 680ms ease both;
  }

  .signal-panel {
    animation-delay: 120ms;
  }

  .case-study:nth-child(2),
  .project-card:nth-child(2) {
    animation-delay: 80ms;
  }

  .case-study:nth-child(3),
  .project-card:nth-child(3) {
    animation-delay: 150ms;
  }

  @keyframes rise-in {
    from {
      transform: translateY(18px);
    }
    to {
      transform: translateY(0);
    }
  }
}