:root {
  --bg: #0b0b14;
  --surface: #14141f;
  --surface-2: #1b1b29;
  --border: #262637;
  --text: #e8e6f2;
  --muted: #8b87a3;
  --accent: #8b6bff;
  --accent-2: #c9a8ff;
  --good: #34d399;
  --mid: #fbbf24;
  --bad: #f87171;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: radial-gradient(1200px 600px at 80% -10%, #1c1530 0%, var(--bg) 55%);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
}

/* ---------- 상단 네비게이션 ---------- */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: rgba(11,11,20,.85);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 40;
  flex-wrap: wrap;
  gap: 10px;
}
.brand {
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 18px;
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}
.navlinks { display: flex; gap: 4px; flex-wrap: wrap; }
.navlinks a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.navlinks a:hover { background: var(--surface-2); color: var(--text); }
.navlinks a.active { background: var(--surface-2); color: var(--accent-2); }

/* ---------- 본문 레이아웃 ---------- */
.page { max-width: 1100px; margin: 0 auto; padding: 40px 24px 80px; }
.page-narrow { max-width: 760px; margin: 0 auto; padding: 48px 24px 80px; }

h1 { font-family: 'Manrope', sans-serif; font-size: 30px; margin: 0 0 10px; line-height: 1.3; }
h2 { font-family: 'Manrope', sans-serif; font-size: 21px; margin: 34px 0 12px; }
h3 { font-family: 'Manrope', sans-serif; font-size: 17px; margin: 22px 0 8px; }
p { line-height: 1.8; color: #cfcde0; font-size: 15px; }
ul, ol { line-height: 1.9; color: #cfcde0; font-size: 15px; padding-left: 22px; }
li { margin-bottom: 4px; }
a { color: var(--accent-2); }
.lede { color: var(--muted); font-size: 15.5px; line-height: 1.7; margin-bottom: 28px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}
.callout {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 18px 0;
  font-size: 14px;
  color: #d8d6e6;
}

/* ---------- 홈 히어로 ---------- */
.hero { padding: 72px 24px 48px; text-align: center; }
.hero h1 { font-size: 40px; max-width: 760px; margin: 0 auto 16px; }
.hero p { max-width: 560px; margin: 0 auto 28px; font-size: 16px; }
.hero-cta { display: inline-flex; gap: 10px; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 14.5px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  font-family: 'Inter', sans-serif;
}
.btn-primary { background: linear-gradient(135deg, var(--accent-2), var(--accent)); color: #0b0b14; }
.btn-ghost { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 40px 0; }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.feature-card .ico { font-size: 22px; margin-bottom: 10px; }
.feature-card h4 { font-family: 'Manrope', sans-serif; font-size: 14.5px; margin: 0 0 6px; }
.feature-card p { font-size: 12.5px; color: var(--muted); margin: 0; line-height: 1.6; }

.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 20px 0 40px; }
.guide-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; text-decoration: none; color: var(--text); display: block;
  transition: border-color .15s, transform .1s;
}
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.guide-card h4 { font-family: 'Manrope', sans-serif; font-size: 15px; margin: 0 0 6px; color: var(--text); }
.guide-card p { font-size: 12.5px; color: var(--muted); margin: 0; }

/* ---------- 표 ---------- */
table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin: 16px 0; }
thead th { text-align: left; font-size: 11px; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); padding: 10px 14px; background: var(--surface-2); font-weight: 600; }
tbody td { padding: 10px 14px; font-size: 13.5px; border-top: 1px solid var(--border); color: #d8d6e6; }
tbody tr:hover { background: var(--surface-2); }
.num { font-family: 'JetBrains Mono', monospace; color: var(--text); }

/* ---------- 키워드 복사 버튼 ---------- */
.copy-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  font-family: 'Inter', sans-serif;
  transition: background .15s, color .15s, border-color .15s;
}
.copy-btn:hover { background: var(--surface); color: var(--accent-2); border-color: var(--accent); }
.copy-btn.copied { color: var(--good); border-color: var(--good); background: rgba(52,211,153,.12); }
table th:first-child, table td:first-child { width: 1%; white-space: nowrap; }

/* ---------- 푸터 ---------- */
.sitefooter {
  border-top: 1px solid var(--border);
  padding: 28px 32px;
  color: var(--muted);
  font-size: 12.5px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.sitefooter a { color: var(--muted); }
.sitefooter a:hover { color: var(--accent-2); }

@media (max-width: 780px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-grid { grid-template-columns: 1fr; }
  .topnav { padding: 12px 16px; }
}