:root {
  --bg: #0a0a0c;
  --bg-alt: #131316;
  --fg: #e8e8ec;
  --fg-dim: #8a8a94;
  --accent: #6ee7b7;
  --border: #232328;
}
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --fg: #16161a;
  --fg-dim: #6b6b74;
  --accent: #0f9d6e;
  --border: #e2e2e6;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", "Noto Sans KR", sans-serif;
  line-height: 1.6;
  transition: background 0.15s, color 0.15s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
.logo { width: 90px; height: 40px; overflow: hidden; border-radius: 6px; }
.logo img { width: 100%; height: 100%; display: block; filter: invert(1); object-fit: cover; }
:root[data-theme="light"] .logo img { filter: none; }
header nav { display: flex; align-items: center; }
header nav a { margin-left: 1.5rem; color: var(--fg-dim); font-size: 0.9rem; }
header nav a:hover { color: var(--fg); }
header nav button {
  margin-left: 1.5rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg-dim);
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  font-family: inherit;
}
header nav button:hover { color: var(--fg); border-color: var(--accent); }

.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}
.hero p {
  color: var(--fg-dim);
  font-size: 1.15rem;
  max-width: 620px;
  margin: 0 0 2rem;
}
.cta {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
}
.cta:hover { border-color: var(--accent); text-decoration: none; }

section { max-width: 1100px; margin: 0 auto; padding: 2rem 2rem 4rem; }
section h2 { font-size: 1.4rem; margin-bottom: 1.5rem; color: var(--fg); }

.marquee {
  overflow: hidden;
  width: 100%;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
}
.marquee-track {
  display: flex;
  gap: 1rem;
  width: max-content;
  animation: marquee-scroll 30s linear infinite;
}
.marquee-track:hover { animation-play-state: paused; }
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
  .marquee { overflow-x: auto; }
}
.card {
  flex: 0 0 260px;
  width: 260px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.3rem;
  display: block;
  color: var(--fg);
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--fg-dim); font-size: 0.9rem; }
.card .lang { display: inline-block; margin-top: 0.8rem; font-size: 0.75rem; color: var(--accent); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.grid .card { width: auto; }

.profile {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.profile img {
  width: 120px;
  height: 120px;
  border-radius: 16px;
  border: 1px solid var(--border);
}

.chart { width: 100%; overflow-x: auto; }
.chart-grid { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 1fr); gap: 3px; width: max-content; }
.chart-grid div { width: 10px; height: 10px; border-radius: 2px; background: var(--border); }

footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
  color: var(--fg-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}