:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a28;
  --fg: #e0e0e8;
  --fg2: #8888a0;
  --accent: #6c5ce7;
  --accent2: #a29bfe;
  --trit-t: #00e676;
  --trit-o: #ffd600;
  --trit-a: #ff5252;
  --gold: #ffc107;
  --radius: 12px;
  --mono: 'SF Mono', 'Fira Code', monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 60px; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── 네비게이션 ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--bg3);
}
.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--fg);
  letter-spacing: -0.5px;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo span { color: var(--accent2); }
.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}
.nav-links a {
  font-size: 0.85rem;
  color: var(--fg2);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--fg); text-decoration: none; }
.nav-ext {
  padding: 4px 12px;
  border: 1px solid var(--bg3);
  border-radius: 6px;
  font-size: 0.8rem !important;
}
.nav-ext:hover { border-color: var(--accent); }
.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 4px; padding: 4px;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--fg2); border-radius: 1px;
}

.hero {
  text-align: center;
  padding: 120px 20px 60px;
  background: linear-gradient(180deg, #0d0d18 0%, var(--bg) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(108,92,231,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.hero h1 span { color: var(--accent2); }
.hero .subtitle {
  font-size: 1.15rem;
  color: var(--fg2);
  max-width: 600px;
  margin: 0 auto 32px;
}
.badge-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid;
}
.badge-metal { border-color: var(--trit-t); color: var(--trit-t); }
.badge-dx { border-color: var(--trit-o); color: var(--trit-o); }
.badge-vulkan { border-color: var(--trit-a); color: var(--trit-a); }
.badge-trit { border-color: var(--accent2); color: var(--accent2); }

.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

.section { padding: 60px 0; }
.section h2 {
  font-size: 1.8rem;
  margin-bottom: 24px;
  color: var(--fg);
}
.section h2 .num {
  color: var(--accent2);
  font-family: var(--mono);
  font-size: 1rem;
  margin-right: 8px;
}

.arch-box {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 32px;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.8;
  white-space: pre;
  overflow-x: auto;
  color: var(--fg2);
  margin-bottom: 40px;
}
.arch-box .hl { color: var(--accent2); }
.arch-box .t { color: var(--trit-t); }
.arch-box .o { color: var(--trit-o); }
.arch-box .a { color: var(--trit-a); }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.card {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent); }
.card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--fg);
}
.card p {
  font-size: 0.9rem;
  color: var(--fg2);
  line-height: 1.5;
}
.card .tag {
  display: inline-block;
  background: var(--bg3);
  color: var(--accent2);
  padding: 2px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--mono);
  margin-top: 10px;
}

.mapping-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  font-size: 0.9rem;
}
.mapping-table th, .mapping-table td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--bg3);
}
.mapping-table th {
  color: var(--fg2);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.mapping-table td:first-child { color: var(--fg2); font-family: var(--mono); font-size: 0.82rem; }
.mapping-table td:nth-child(2) { color: var(--accent2); font-family: var(--mono); font-size: 0.82rem; }
.mapping-table tr:hover { background: var(--bg2); }

.phase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 24px 0;
}
.phase-card {
  text-align: center;
  padding: 20px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--bg3);
  background: var(--bg2);
}
.phase-card .val {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--mono);
}
.phase-card .label { font-size: 0.82rem; color: var(--fg2); margin-top: 4px; }
.p-confirmed .val { color: var(--trit-t); }
.p-unconfirmed .val { color: var(--trit-o); }
.p-misunderstood .val { color: var(--trit-a); }
.p-unaware .val { color: var(--fg2); }

.downloads {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.dl-card {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dl-card h3 { font-size: 1.1rem; }
.dl-card .meta {
  font-size: 0.82rem;
  color: var(--fg2);
  font-family: var(--mono);
}
.dl-card .desc { font-size: 0.9rem; color: var(--fg2); }
.dl-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  text-align: center;
  transition: background 0.2s;
  margin-top: auto;
}
.dl-btn:hover { background: var(--accent2); text-decoration: none; }

.code-block {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 24px;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
  margin: 16px 0;
  color: var(--fg2);
}
.code-block .kw { color: var(--accent2); }
.code-block .fn { color: var(--trit-t); }
.code-block .str { color: var(--gold); }
.code-block .cm { color: #555; }

.cube-demo {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  margin: 24px 0;
}
.cube-demo .trit {
  display: inline-block;
  width: 22px; height: 22px;
  line-height: 22px;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 3px;
  margin: 1px;
}
.cube-demo .trit-t { background: rgba(0,230,118,0.2); color: var(--trit-t); }
.cube-demo .trit-o { background: rgba(255,214,0,0.15); color: var(--trit-o); }
.cube-demo .trit-a { background: rgba(255,82,82,0.2); color: var(--trit-a); }
.cube-demo .sep { display: inline-block; width: 8px; }
.cube-demo .label { color: var(--fg2); font-size: 0.82rem; margin-top: 12px; }

.demo-container {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.demo-container canvas {
  display: block;
  width: 100%;
  cursor: crosshair;
}

.cube-demo input[type="number"]::-webkit-inner-spin-button,
.cube-demo input[type="number"]::-webkit-outer-spin-button {
  opacity: 0.5;
}
.cube-demo input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── 라이선스 ── */
.license-box {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  overflow: hidden;
}
.license-header {
  padding: 20px 28px;
  display: flex;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--bg3);
}
.license-badge {
  background: var(--accent);
  color: #fff;
  padding: 4px 14px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  font-family: var(--mono);
}
.license-type {
  color: var(--fg2);
  font-size: 0.9rem;
}
.license-body { padding: 28px; }
.license-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.license-item h4 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--bg3);
}
.license-item.allowed h4 { color: var(--trit-t); border-color: var(--trit-t); }
.license-item.commercial h4 { color: var(--trit-o); border-color: var(--trit-o); }
.license-item.restrict h4 { color: var(--trit-a); border-color: var(--trit-a); }
.license-item ul {
  list-style: none;
  font-size: 0.85rem;
  color: var(--fg2);
  line-height: 1.8;
}
.license-item.allowed li::before { content: '+ '; color: var(--trit-t); font-weight: 700; }
.license-item.commercial li::before { content: '~ '; color: var(--trit-o); font-weight: 700; }
.license-item.restrict li::before { content: '- '; color: var(--trit-a); font-weight: 700; }
.license-contact {
  padding: 16px 28px;
  border-top: 1px solid var(--bg3);
  font-size: 0.85rem;
  color: var(--fg2);
}

/* ── 푸터 ── */
footer {
  border-top: 1px solid var(--bg3);
  padding: 40px 20px;
}
.footer-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}
.footer-brand {
  font-size: 1rem;
  font-weight: 800;
  color: var(--fg);
}
.footer-brand span { color: var(--accent2); }
.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--fg2);
}
.footer-links a:hover { color: var(--accent2); }
.footer-copy {
  font-size: 0.78rem;
  color: var(--fg2);
  line-height: 1.6;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .hero { padding-top: 100px; }
  .phase-grid { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: 1fr; }
  .downloads { grid-template-columns: 1fr; }
  .license-row { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 52px; left: 0; right: 0;
    background: rgba(10,10,15,0.97);
    padding: 16px 24px;
    gap: 12px;
    border-bottom: 1px solid var(--bg3);
  }
  .nav-toggle { display: flex; }
}