:root {
  --bg: #0b0e14;
  --panel: #141926;
  --border: #262d3d;
  --text: #e6e9f0;
  --muted: #8b93a7;
  --accent: #4f8cff;
  --accent-dark: #3568c9;
  --success: #3ecf8e;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Pretendard, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 900px; margin: 0 auto; padding: 0 24px; }

.site-header { border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--bg); z-index: 10; }
.header-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; }
.logo { font-weight: 700; font-size: 1.25rem; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
nav a:hover { color: var(--text); }
.lang-switch button { background: none; border: 1px solid var(--border); color: var(--muted); padding: 4px 10px; border-radius: 6px; cursor: pointer; margin-left: 6px; }
.lang-switch button.active { color: var(--text); border-color: var(--accent); }

.hero { padding: 80px 0 60px; text-align: center; }
.hero h1 { font-size: 2.2rem; margin-bottom: 16px; }
.hero p { color: var(--muted); max-width: 620px; margin: 0 auto 32px; }
.hero-ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-block; padding: 10px 20px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; font-size: 0.95rem; text-decoration: none; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); }
.btn-ghost { background: transparent; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 28px; margin-bottom: 28px; }
.create h2, .pricing h2 { margin-top: 60px; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab-btn { background: none; border: 1px solid var(--border); color: var(--muted); padding: 8px 16px; border-radius: 8px; cursor: pointer; }
.tab-btn.active { color: var(--text); border-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

textarea, input[type="url"], input[type="text"] {
  width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: 10px 12px; font-family: inherit; font-size: 0.95rem; margin-bottom: 10px;
}
.field-label { display: block; margin-top: 16px; margin-bottom: 6px; color: var(--muted); font-size: 0.9rem; }
.hint { color: var(--muted); font-size: 0.85rem; }

.dropzone { border: 2px dashed var(--border); border-radius: 10px; padding: 40px; text-align: center; cursor: pointer; color: var(--muted); }
.dropzone:hover { border-color: var(--accent); }
#image-preview { max-width: 100%; margin-top: 12px; border-radius: 8px; }

#btn-generate { margin-top: 20px; }

.cert { display: grid; grid-template-columns: 140px 1fr; gap: 8px 16px; margin: 16px 0; }
.cert dt { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-all; font-size: 0.85rem; }

.tiers { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }
.tier-card { border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.tier-card.selected { border-color: var(--accent); background: rgba(79,140,255,0.08); }
.tier-card p { color: var(--muted); font-size: 0.9rem; }

.wallets { display: flex; gap: 12px; margin-bottom: 8px; }
#bithumb-note { margin-top: 0; }

#btn-mint { margin-top: 16px; }
#mint-result { margin-top: 16px; padding: 16px; background: rgba(62,207,142,0.08); border: 1px solid var(--success); border-radius: 8px; }
#mint-result a { color: var(--success); }

.pricing-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; }
.price-card { border: 1px solid var(--border); border-radius: 12px; padding: 24px; }
.price-card.highlighted { border-color: var(--accent); }
.price-card .price { font-size: 1.4rem; font-weight: 700; margin: 8px 0 16px; }
.price-card ul { padding-left: 20px; color: var(--muted); }

.site-footer { border-top: 1px solid var(--border); margin-top: 80px; padding: 24px 0; color: var(--muted); font-size: 0.85rem; text-align: center; }

.demo-banner { background: #4a3a10; color: #ffd27a; text-align: center; padding: 10px; font-size: 0.9rem; }
.demo-banner a { color: #fff; margin-left: 10px; }

@media (max-width: 700px) {
  .tiers, .pricing-cards { grid-template-columns: 1fr; }
  nav { display: none; }
}