/* CSS 변수 */
:root{
  --bg:#ffffff;
  --fg:#0f172a; /* slate-900 */
  --muted:#64748b; /* slate-500 */
  --primary:#38bdf8; /* sky-400 */
  --primary-600:#0284c7; /* sky-600 */
  --border:#e2e8f0; /* slate-200 */
  --card:#f8fafc; /* slate-50 */
  --radius:14px;
}

*{ box-sizing:border-box }
html,body{
  margin:0;
  padding:0;
  background:var(--bg);
  color:var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica Neue, Arial, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  line-height:1.6;
  scrollbar-gutter: stable;
}

.container{
  width:min(1100px, 92%);
  margin:0 auto;
}

.site-header{
  border-bottom:1px solid var(--border);
  background:var(--bg);
  position:sticky;
  top:0; z-index:10;
  backdrop-filter:saturate(180%) blur(6px);
}
.site-header .container{ padding:20px 0 }
.site-title{ margin:0; font-size:clamp(22px, 3.2vw, 30px) }
.site-subtitle{ margin:6px 0 0; color:var(--muted); font-size:14px }

main.container{ padding:28px 0 48px }

.layout{ display:grid; gap:22px; grid-template-columns:1fr; }

@media (min-width: 920px){
  .layout{ grid-template-columns: 1.4fr 1fr; align-items:start }
}

.editor{ background:var(--card); border:1px solid var(--border); border-radius:var(--radius); padding:16px }
.input-label{ display:block; font-weight:600; margin-bottom:10px }
textarea{
  width:100%;
  min-height:260px;
  resize:vertical;
  font-size:16px;
  padding:12px 14px;
  border-radius:10px;
  border:1px solid var(--border);
  outline:none;
  transition:border-color .15s ease, box-shadow .15s ease;
}
textarea:focus{ border-color:var(--primary); box-shadow:0 0 0 3px rgba(56,189,248,.25) }

.help-text{ color:var(--muted); font-size:13px; margin:10px 2px 12px }
.options{ display:flex; gap:16px; align-items:center; margin:0 2px 12px }
.checkbox{ display:flex; gap:8px; align-items:center; color:#0f172a; font-size:14px }
.checkbox input{ width:16px; height:16px }

.actions{ display:flex; gap:10px; flex-wrap:wrap }
.btn{
  background:var(--primary);
  color:#fff;
  border:none;
  border-radius:10px;
  padding:10px 14px;
  font-weight:600;
  cursor:pointer;
  transition: background .15s ease, transform .05s ease;
}
.btn:hover{ background:var(--primary-600) }
.btn:active{ transform:translateY(1px) }
.btn-ghost{ background:#e6f6fe; color:#0c4a6e }

.stats{ display:grid; gap:14px; grid-template-columns:repeat(4, 1fr) }
@media (max-width: 560px){ .stats{ grid-template-columns:1fr } }

.stat-card{ background:var(--card); border:1px solid var(--border); border-radius:var(--radius); padding:16px; display:flex; flex-direction:column }
.stat-label{ color:var(--muted); font-size:13px; margin-bottom:8px }
.stat-value{ font-size:clamp(22px, 5vw, 36px); font-weight:800; letter-spacing:.3px; margin-top:auto }

.seo-copy{ margin-top:30px }
.seo-copy h2{ margin:0 0 8px; font-size:20px }
.seo-copy p{ margin:0; color:#334155 }

.site-footer{ border-top:1px solid var(--border); background:var(--bg) }
.site-footer .container{ padding:16px 0; color:var(--muted); display:flex; gap:8px; align-items:center; flex-wrap:wrap }
.sep{ opacity:.5 }

.social-link{
  color:var(--primary);
  text-decoration:none;
  font-size:14px;
  transition:color 0.2s ease;
}
.social-link:hover{
  color:var(--primary-600);
  text-decoration:underline;
}

/* 유틸 */
.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}