:root {
  --bg: #030509;
  --panel: #070a0f;
  --panel-soft: rgba(255, 255, 255, 0.035);
  --ink: #f4f7ff;
  --muted: #a6b0c4;
  --dim: #68728a;
  --line: rgba(255, 255, 255, 0.16);
  --grid-line: rgba(126, 249, 255, 0.07);
  --accent: #7df9ff;
  --aura: rgba(125, 249, 255, 0.18);
  --warm: #f79b12;
  --violet: #8c69ff;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  cursor: none;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.58;
}
body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(90deg, transparent, #000 16%, #000 84%, transparent);
}
body::after {
  position: fixed;
  inset: -20%;
  z-index: -3;
  content: "";
  background:
    radial-gradient(circle at 18% 15%, rgba(125, 249, 255, 0.14), transparent 24%),
    radial-gradient(circle at 74% 82%, rgba(140, 105, 255, 0.11), transparent 25%),
    #020409;
}

a { color: inherit; cursor: none; text-decoration: none; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
p, h1, h2, h3 { margin: 0; }

.skip-link {
  position: fixed;
  left: 20px;
  top: 20px;
  z-index: 50;
  transform: translateY(-160%);
  border: 1px solid var(--accent);
  background: var(--bg);
  padding: 8px 12px;
}
.skip-link:focus { transform: translateY(0); }

#cursor {
  position: fixed;
  left: -15px;
  top: -15px;
  z-index: 100;
  width: 30px;
  height: 30px;
  border: 2px solid rgba(125, 249, 255, 0.75);
  border-radius: 50%;
  pointer-events: none;
  mix-blend-mode: screen;
}

.sidebar { position: fixed; z-index: 20; }
.sidebar ul { margin: 0; padding: 0; list-style: none; }
.sidebar.navigator { left: 26px; top: 50%; transform: translateY(-50%); }
.sidebar.navigator li { margin: 14px 0; }
.sidebar.navigator a { display: grid; width: 18px; height: 18px; place-items: center; }
.sidebar.navigator .circle {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(125, 249, 255, 0.35);
  transition: transform 160ms ease, background 160ms ease;
}
.sidebar.navigator a:hover .circle { transform: scale(1.7); background: var(--accent); }
.label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sidebar.socials { right: 28px; bottom: 34px; }
.sidebar.socials li { margin-top: 10px; text-align: right; }
.sidebar.socials a { color: rgba(246, 248, 255, 0.58); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; }

.top-menu {
  position: absolute;
  inset: 0 auto auto 0;
  z-index: 1;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  pointer-events: none;
}
.subjects {
  width: 190vw;
  margin: -0.18em 0 0 -0.06em;
  color: rgba(255,255,255,0.03);
  font-size: clamp(54px, 12vw, 190px);
  font-weight: 950;
  letter-spacing: -0.09em;
  line-height: 0.82;
}
.title { display: inline-block; margin-right: 0.1em; color: inherit; pointer-events: auto; }
.title:nth-child(4n) { color: rgba(125,249,255,0.05); }
.title:nth-child(4n + 2) { color: rgba(140,105,255,0.045); }
.title:hover { color: rgba(125,249,255,0.48); }

.main-cover {
  position: relative;
  display: grid;
  min-height: 100vh;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.cover-inner {
  position: relative;
  z-index: 2;
  width: min(1120px, calc(100% - 56px));
  padding: 112px 0 86px;
  text-align: center;
}
.overline {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
h1 {
  font-size: clamp(72px, 13vw, 178px);
  font-weight: 950;
  letter-spacing: -0.1em;
  line-height: 0.8;
}
.lead {
  max-width: 980px;
  margin: 28px auto 0;
  font-size: clamp(30px, 5vw, 70px);
  font-weight: 920;
  letter-spacing: -0.075em;
  line-height: 0.95;
}
.summary {
  max-width: 760px;
  margin: 26px auto 0;
  color: var(--muted);
  font-size: 17px;
}
.ai-mark-animation {
  width: min(640px, 100%);
  margin: 30px auto 0;
  opacity: 0.88;
}
.ai-mark-animation img { display: block; width: 100%; height: auto; }
.signal-list,
.logo-cloud { display: none; }

.section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(280px, 0.32fr) minmax(0, 0.68fr);
  gap: clamp(48px, 5vw, 92px);
  min-height: 92vh;
  padding: 118px max(72px, calc((100vw - 1600px) / 2)) 126px;
  border-top: 1px solid var(--line);
  background: rgba(2, 4, 9, 0.92);
}
.dark-block { background: rgba(5, 7, 12, 0.94); }
.section-title h2 {
  position: sticky;
  top: 34px;
  display: block;
  max-width: 520px;
  color: var(--ink);
  font-size: clamp(70px, 8.3vw, 144px);
  font-weight: 950;
  letter-spacing: -0.105em;
  line-height: 0.78;
  text-wrap: balance;
}
.section-title-icon { display: none; }
.section-body {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.entry {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 30px;
  padding: 0 0 34px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--line);
}
.entry:last-child { margin-bottom: 0; }
time,
.project-stack span { color: var(--muted); font-size: 14px; letter-spacing: 0.04em; }
h3 { margin: 5px 0 10px; font-size: clamp(26px, 3vw, 44px); font-weight: 930; letter-spacing: -0.065em; line-height: 0.96; }
.entry p,
.project-stack p,
.columns span,
.contact-list p { color: #dbe2f2; font-size: clamp(17px, 1.35vw, 23px); }
.logo-entry { align-items: center; }
.entry-logo {
  display: grid;
  place-items: center;
  min-height: 112px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  overflow: hidden;
}
.entry-logo img { display: block; max-width: 124px; max-height: 74px; object-fit: contain; }
.entry-logo img[src$="jcloud.png"] { max-width: 148px; max-height: 46px; }
.entry-logo img[src$="skax.svg"] { max-width: 78px; max-height: 70px; }
.entry-logo img[src$="jbnu.png"] { max-width: 72px; max-height: 72px; }

.columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); }
.columns p {
  min-height: 150px;
  background: rgba(3, 5, 10, 0.98);
  padding: 26px;
}
.icon-columns p { display: grid; grid-template-columns: 38px minmax(0, 1fr); gap: 8px 16px; align-content: start; }
.icon-columns p > img { grid-row: 1 / span 2; width: 30px; height: 30px; }
.columns b,
.columns span { display: block; }
.columns b { font-size: 20px; line-height: 1.05; letter-spacing: -0.04em; }

.cards,
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
}
.cards .item,
.skills-grid .skill-item {
  position: relative;
  display: grid;
  min-height: 158px;
  place-items: center;
  align-content: center;
  gap: 18px;
  overflow: hidden;
  isolation: isolate;
  background: rgba(3, 5, 10, 0.99);
  color: var(--ink);
  font-size: 16px;
  font-weight: 850;
  letter-spacing: -0.035em;
  text-align: center;
  animation: skill-reveal 520ms cubic-bezier(.2,.85,.2,1) both;
  animation-delay: calc(var(--i) * 28ms);
}
.skills-grid .skill-item::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0;
  background: radial-gradient(circle at 50% 12%, rgba(125,249,255,.18), transparent 46%);
  transform: translateY(16px);
  transition: opacity 220ms ease, transform 220ms ease;
}
.skills-grid .skill-item img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  animation: skill-float 4.8s ease-in-out infinite;
  animation-delay: calc(var(--i) * -160ms);
}
.skills-grid .skill-item:hover::before { opacity: 1; transform: translateY(0); }
.skills-grid .skill-item:hover img { transform: translateY(-3px) scale(1.08); }

.project-stack { display: grid; gap: 1px; background: var(--line); }
.project-stack article {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 30px;
  min-height: 170px;
  background: rgba(5, 7, 12, 0.99);
  padding: 34px 0;
}
.project-stack h3,
.project-stack p,
.project-stack a { grid-column: 2; }
.project-stack span { grid-column: 1; grid-row: 1 / span 3; display: grid; place-items: center; padding-left: 28px; overflow: hidden; }
.project-stack span img { max-width: 124px; max-height: 68px; object-fit: contain; }
.project-stack a { width: fit-content; margin-top: 8px; color: var(--accent); font-size: 15px; }

.team-grid,
.compact-team-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); }
.team-grid article {
  min-height: 260px;
  background: rgba(5, 8, 12, 0.98);
  padding: 40px;
  overflow: hidden;
}
.team-grid img { display: block; max-width: 190px; max-height: 60px; object-fit: contain; margin-bottom: 54px; }
.team-grid b,
.team-grid span { display: block; }
.team-grid b { margin-bottom: 16px; font-size: clamp(28px, 3vw, 42px); font-weight: 930; letter-spacing: -0.07em; line-height: 0.95; }
.team-grid span { color: #dbe2f2; font-size: clamp(18px, 1.7vw, 28px); }

.contact-list,
.logo-contacts { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.logo-contacts a {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-height: 64px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  font-size: clamp(24px, 3.5vw, 54px);
  font-weight: 930;
  letter-spacing: -0.075em;
  line-height: 1;
}
.logo-contacts a img { width: 32px; height: 32px; flex: 0 0 auto; }
.logo-contacts p { flex-basis: 100%; margin-top: 70px; color: var(--dim); font-size: 16px; }

@keyframes skill-reveal {
  from { opacity: .82; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes skill-float {
  0%, 100% { transform: translateY(0); filter: drop-shadow(0 0 0 rgba(125,249,255,0)); }
  50% { transform: translateY(-8px); filter: drop-shadow(0 12px 18px rgba(125,249,255,.22)); }
}

@media (max-width: 1100px) {
  .section { grid-template-columns: 1fr; min-height: auto; gap: 34px; padding: 86px 28px 96px; }
  .section-title h2 { position: static; max-width: none; font-size: clamp(48px, 15vw, 96px); }
  .cards, .skills-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  body, a { cursor: auto; }
  #cursor, .sidebar, .top-menu { display: none; }
  .cover-inner { width: calc(100% - 32px); padding-top: 72px; text-align: left; }
  .lead, .summary { margin-left: 0; }
  .entry, .project-stack article { grid-template-columns: 1fr; gap: 12px; }
  .project-stack h3, .project-stack p, .project-stack a, .project-stack span { grid-column: auto; padding-left: 0; place-items: start; }
  .entry-logo { width: min(190px, 100%); }
  .columns, .team-grid, .compact-team-grid { grid-template-columns: 1fr; }
  .cards, .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skills-grid .skill-item { min-height: 132px; }
  .logo-contacts a { width: 100%; font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .skills-grid .skill-item,
  .skills-grid .skill-item img { animation: none; }
}