:root {
  --bg-0: #06080d;
  --bg-1: #0b1018;
  --bg-2: #111827;
  --line: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --text-0: #e6edf3;
  --text-1: #9aa4b2;
  --text-2: #5b6473;
  --accent: #4cc9f0;
  --accent-2: #7aa2f7;
  --red: #ff5d6c;
  --green: #4ade80;
  --cyan: #22d3ee;
  --amber: #f5b461;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text-0);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
    "Hiragino Sans GB", "Hiragino Kaku Gothic ProN", "Yu Gothic UI",
    "Meiryo", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- Site chrome ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: rgba(6, 8, 13, 0.72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.4px;
}

.brand-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.site-nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--text-1);
}

.site-nav a { padding: 6px 10px; border-radius: 8px; transition: all 0.2s; }
.site-nav a:hover { color: var(--text-0); background: var(--line); }
.site-nav a.active { color: var(--text-0); background: var(--line-strong); }

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 24px 32px;
  border-top: 1px solid var(--line);
  color: var(--text-2);
  font-size: 13px;
  letter-spacing: 0.3px;
}

/* ---------- Landing page ---------- */
.landing { min-height: 100vh; display: flex; flex-direction: column; }

.hero { flex: 1; padding: 72px 32px 96px; }

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 2px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: -1px;
  font-weight: 600;
}

.lead {
  margin: 0 0 56px;
  max-width: 640px;
  font-size: 17px;
  color: var(--text-1);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  display: block;
  padding: 26px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid var(--line);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(800px circle at var(--mx, 50%) var(--my, 0%),
              rgba(76, 201, 240, 0.08), transparent 40%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
}

.card:hover::before { opacity: 1; }

.card-tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(76, 201, 240, 0.12);
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 1.5px;
  margin-bottom: 14px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 22px;
  letter-spacing: -0.3px;
}

.card p {
  margin: 0;
  color: var(--text-1);
  font-size: 14px;
}

.card-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.card-meta span {
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11px;
  background: var(--line);
  color: var(--text-1);
  letter-spacing: 0.5px;
}

.card-placeholder {
  opacity: 0.55;
  pointer-events: none;
  border-style: dashed;
}

.card-placeholder .card-tag {
  background: var(--line);
  color: var(--text-2);
}

@media (max-width: 720px) {
  .hero { padding: 48px 20px 72px; }
  .hero h1 { font-size: 36px; }
  .site-header { padding: 14px 20px; }
  .site-footer { padding: 18px 20px; flex-direction: column; gap: 4px; }
}