:root {
  --bg: #07111f;
  --bg-soft: #0d1a2b;
  --card: rgba(16, 31, 49, 0.78);
  --card-strong: rgba(17, 34, 54, 0.94);
  --text: #eef6ff;
  --muted: #a6b8cc;
  --line: rgba(166, 184, 204, 0.18);
  --accent: #65d6c6;
  --accent-2: #8bb8ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 10%, rgba(101, 214, 198, 0.13), transparent 34rem),
    radial-gradient(circle at 90% 20%, rgba(139, 184, 255, 0.14), transparent 30rem),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

body::before {
  content: "Kai Kyungsuk Song  •  ksong0xd@gmail.com";
  position: fixed;
  z-index: 0;
  left: 50%;
  top: 55%;
  transform: translate(-50%, -50%) rotate(-20deg);
  width: max-content;
  max-width: 92vw;
  font-size: clamp(1.1rem, 2.7vw, 2.6rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: rgba(238, 246, 255, 0.035);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 120ms ease-out;
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 0;
}

.brand {
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

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

.nav-links a:hover { color: var(--text); }

.lang-link {
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,0.025);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.75fr);
  gap: 34px;
  align-items: center;
  padding: 72px 0 64px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 800px;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
}

.hero-title-accent {
  display: block;
  margin-top: 10px;
  color: var(--accent-2);
}

.lede {
  max-width: 760px;
  margin: 28px 0 0;
  color: #cbd9e7;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.hero-actions,
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-actions { margin-top: 30px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255,255,255,0.035);
  font-weight: 750;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button.primary {
  border-color: transparent;
  background: var(--accent);
  color: #05201c;
}

.button:hover {
  transform: translateY(-2px);
  border-color: rgba(139, 184, 255, 0.65);
  background: rgba(255,255,255,0.07);
}

.button.primary:hover { background: #86eadc; }

.profile-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.025));
  box-shadow: var(--shadow);
}

.avatar {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.13);
}

.profile-meta {
  display: grid;
  gap: 5px;
  margin-top: 18px;
}

.profile-meta strong { font-size: 1.08rem; }
.profile-meta span { color: var(--muted); font-size: 0.94rem; }

section { padding: 54px 0; }

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  letter-spacing: -0.035em;
}

.section-head p {
  margin: 0;
  max-width: 580px;
  color: var(--muted);
}

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

.card {
  grid-column: span 6;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  backdrop-filter: blur(12px);
}

.card.wide { grid-column: span 8; }
.card.narrow { grid-column: span 4; }

.card-kicker {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card h3 {
  margin: 9px 0 8px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card a.more {
  display: inline-block;
  margin-top: 16px;
  color: var(--text);
  font-weight: 750;
  text-decoration-color: rgba(101,214,198,0.55);
  text-underline-offset: 4px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.metric {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,0.025);
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  color: var(--accent-2);
}

.metric span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.86rem;
}

.journal-card {
  padding: 30px;
  border: 1px solid rgba(101, 214, 198, 0.3);
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(101,214,198,0.10), rgba(139,184,255,0.06)),
    var(--card-strong);
}

.journal-card blockquote {
  margin: 18px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent);
  color: #dbe7f3;
  font-size: 1.05rem;
}

.journal-links { margin-top: 22px; }

.fun-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.fun-list li {
  padding: 18px 20px;
  border-left: 3px solid var(--accent-2);
  border-radius: 0 14px 14px 0;
  background: rgba(255,255,255,0.03);
  color: #d6e2ef;
}

.social-links a {
  min-width: 94px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  text-align: center;
  text-decoration: none;
}

.social-links a:hover {
  color: var(--text);
  border-color: rgba(101,214,198,0.6);
}

.contact {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(139,184,255,0.08), rgba(101,214,198,0.08));
}

.contact h2 { margin-top: 0; }
.contact p { color: var(--muted); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

footer a { text-underline-offset: 3px; }

@media (max-width: 850px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .profile-card { max-width: 380px; }
  .card, .card.wide, .card.narrow { grid-column: span 12; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .section-head { align-items: start; flex-direction: column; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 26px, 1120px); }
  nav { align-items: flex-start; }
  .nav-links a:not(.lang-link) { display: none; }
  h1 { font-size: clamp(2.8rem, 16vw, 4.8rem); }
  .metrics { grid-template-columns: 1fr; }
  .profile-card, .card, .journal-card, .contact { border-radius: 18px; }
  footer { flex-direction: column; }
  body::before { font-size: 0.95rem; }
}