:root {
  --bg: #f7f9fc;
  --bg-elevated: rgba(255, 255, 255, 0.78);
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --text: #0f172a;
  --text-soft: #475569;
  --text-faint: #64748b;
  --line: rgba(148, 163, 184, 0.24);
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.09);
  --shadow-soft: 0 12px 28px rgba(15, 23, 42, 0.06);
  --primary: #2563eb;
  --primary-soft: rgba(37, 99, 235, 0.1);
  --accent: #0ea5e9;
  --success: #059669;
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --container: min(1180px, calc(100vw - 32px));
}

:root[data-theme="dark"] {
  --bg: #020617;
  --bg-elevated: rgba(15, 23, 42, 0.8);
  --surface: #0f172a;
  --surface-strong: #111827;
  --text: #e5eefc;
  --text-soft: #cbd5e1;
  --text-faint: #94a3b8;
  --line: rgba(148, 163, 184, 0.16);
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.36);
  --shadow-soft: 0 12px 28px rgba(0, 0, 0, 0.24);
  --primary: #60a5fa;
  --primary-soft: rgba(96, 165, 250, 0.12);
  --accent: #38bdf8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(37,99,235,0.10), transparent 28%),
    radial-gradient(circle at bottom left, rgba(14,165,233,0.08), transparent 30%),
    var(--bg);
  line-height: 1.65;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.site-shell {
  width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: var(--container);
  margin: 16px auto 0;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elevated);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-soft);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 800;
}
.brand-copy {
  display: grid;
  line-height: 1.15;
}
.brand-copy strong { font-size: 0.95rem; }
.brand-copy small { color: var(--text-faint); font-size: 0.78rem; }
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--text-soft);
  font-size: 0.95rem;
}
.desktop-nav a:hover,
.mobile-nav a:hover { color: var(--primary); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.menu-button {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 14px;
}
.mobile-nav {
  display: none;
  width: var(--container);
  margin: 10px auto 0;
  padding: 16px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-soft);
}
.mobile-nav.is-open {
  display: grid;
  gap: 12px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, opacity .2s ease, border-color .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-1px); }
.button-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}
.button-outline {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}
.button-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
}

main {
  width: var(--container);
  margin: 0 auto;
}
.section {
  padding: 90px 0 0;
}
.hero {
  padding-top: 72px;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.8fr);
  gap: 28px;
  align-items: start;
}
.hero-copy,
.hero-card,
.panel,
.project-card,
.project-detail,
.contact-card,
.timeline-item,
.service-card,
.highlight-card {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
}
.hero-copy {
  border-radius: 32px;
  padding: 38px;
}
.eyebrow,
.overline {
  margin: 0 0 10px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}
.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}
.hero-headline {
  margin: 16px 0 0;
  font-size: 1.12rem;
  color: var(--text-soft);
  font-weight: 700;
}
.hero-summary {
  margin-top: 18px;
  color: var(--text-soft);
  font-size: 1.02rem;
}
.hero-summary p { margin: 0 0 12px; }
.hero-links,
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.hero-links a,
.hero-links span {
  color: var(--text-faint);
  font-size: 0.95rem;
}
.hero-links a.link-chip,
.contact-actions a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}
.hero-card {
  border-radius: 32px;
  padding: 24px;
}
.code-card {
  border-radius: 24px;
  padding: 18px 20px;
  background: linear-gradient(180deg, rgba(15,23,42,0.94), rgba(15,23,42,0.86));
  color: #dbeafe;
  overflow: hidden;
}
.code-dots {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.25);
}
.code-card pre {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.6;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.fact-list {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
}
.fact-list div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
}
.fact-list dt {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  font-weight: 700;
}
.fact-list dd {
  margin: 0;
  color: var(--text-soft);
  text-align: right;
}
.highlight-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.highlight-card {
  border-radius: 24px;
  padding: 22px;
}
.highlight-card .label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}
.highlight-card strong {
  display: block;
  margin-top: 12px;
  font-size: 1.8rem;
  letter-spacing: -0.04em;
}
.highlight-card p {
  margin: 8px 0 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}
.section-heading {
  max-width: 760px;
  margin-bottom: 30px;
}
.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}
.section-heading p:last-child {
  margin-top: 12px;
  color: var(--text-soft);
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.panel {
  border-radius: 28px;
  padding: 28px;
}
.panel h3 {
  margin: 0 0 18px;
  font-size: 1.3rem;
}
.strength-list,
.skill-groups {
  display: grid;
  gap: 16px;
}
.strength-item,
.skill-group {
  padding: 18px;
  border-radius: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
}
.strength-item h4,
.skill-group h4 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.strength-item p,
.skill-group p {
  margin: 0;
  color: var(--text-soft);
}
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.project-card {
  border-radius: 28px;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.project-card-link {
  display: block;
  height: 100%;
}
.project-image-wrap {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: rgba(148,163,184,0.08);
}
.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.project-card-body {
  padding: 22px;
}
.project-card-topline,
.project-detail-topline {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.project-card h3,
.project-detail h3 {
  margin: 10px 0 8px;
  font-size: 1.45rem;
  line-height: 1.22;
}
.project-company,
.project-summary,
.project-detail-meta,
.project-detail-summary {
  margin: 0;
  color: var(--text-soft);
}
.project-summary { margin-top: 10px; }
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}
.tag-list span {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 700;
}
.project-detail-list {
  display: grid;
  gap: 28px;
}
.project-detail {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 28px;
  border-radius: 34px;
  padding: 24px;
}
.project-detail:nth-child(even) .project-detail-media {
  order: 2;
}
.project-detail-media {
  align-self: start;
}
.project-detail-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: rgba(148,163,184,0.08);
}
.project-detail-content {
  display: flex;
  flex-direction: column;
}
.project-detail-meta,
.project-detail-summary {
  margin-top: 10px;
}
.detail-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}
.project-detail h4 {
  margin: 0 0 10px;
  font-size: 1rem;
}
.detail-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text-soft);
}
.detail-list li + li {
  margin-top: 8px;
}
.timeline {
  display: grid;
  gap: 18px;
}
.timeline-item {
  position: relative;
  border-radius: 24px;
  padding: 22px 24px;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.12);
}
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 14px;
  flex-wrap: wrap;
}
.timeline-header h3 {
  margin: 0;
  font-size: 1.08rem;
}
.timeline-header span {
  color: var(--text-faint);
  font-size: 0.95rem;
}
.timeline-item p {
  margin: 10px 0 0;
  color: var(--text-soft);
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.service-card {
  border-radius: 24px;
  padding: 24px;
}
.service-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}
.service-card p {
  margin: 0;
  color: var(--text-soft);
}
.contact-section {
  padding-bottom: 80px;
}
.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-radius: 34px;
  padding: 32px;
}
.contact-card h2 {
  margin: 8px 0 10px;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.12;
}
.contact-card p {
  margin: 0;
  color: var(--text-soft);
}
.contact-email {
  margin-top: 16px !important;
  color: var(--primary) !important;
  font-weight: 700;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}
.site-footer {
  width: var(--container);
  margin: 0 auto 40px;
  padding: 18px 0 0;
  color: var(--text-faint);
  font-size: 0.92rem;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1024px) {
  .hero-grid,
  .about-grid,
  .project-detail,
  .contact-card {
    grid-template-columns: 1fr;
  }
  .highlight-grid,
  .project-grid,
  .service-grid {
    grid-template-columns: 1fr 1fr;
  }
  .project-detail:nth-child(even) .project-detail-media {
    order: 0;
  }
}

@media (max-width: 760px) {
  .desktop-nav,
  .header-actions .button:not(.menu-button) {
    display: none;
  }
  .menu-button { display: inline-grid; place-items: center; }
  .site-header {
    margin-top: 12px;
    padding: 12px 14px;
  }
  .hero,
  .section {
    padding-top: 60px;
  }
  .hero-copy,
  .hero-card,
  .panel,
  .project-card-body,
  .project-detail,
  .service-card,
  .contact-card,
  .highlight-card {
    padding: 22px;
  }
  .highlight-grid,
  .project-grid,
  .service-grid,
  .detail-columns {
    grid-template-columns: 1fr;
  }
  .project-detail {
    gap: 20px;
  }
  .contact-actions {
    justify-content: flex-start;
  }
}

@media print {
  :root,
  :root[data-theme="dark"] {
    --bg: #ffffff;
    --bg-elevated: #ffffff;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --text: #0f172a;
    --text-soft: #334155;
    --text-faint: #64748b;
    --line: rgba(148,163,184,0.25);
    --shadow: none;
    --shadow-soft: none;
    --primary: #2563eb;
    --primary-soft: rgba(37,99,235,0.08);
    --accent: #0ea5e9;
  }
  body {
    background: #fff;
  }
  .screen-only,
  .menu-button,
  .mobile-nav {
    display: none !important;
  }
  main,
  .site-footer {
    width: 100%;
  }
  .section {
    padding-top: 30px;
    page-break-inside: avoid;
  }
  .hero-copy,
  .hero-card,
  .panel,
  .project-card,
  .project-detail,
  .timeline-item,
  .service-card,
  .contact-card,
  .highlight-card {
    background: #fff;
    box-shadow: none;
    backdrop-filter: none;
  }
  .project-detail,
  .project-card,
  .timeline-item,
  .service-card,
  .panel,
  .highlight-card {
    break-inside: avoid;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}