:root{
  /* 글씨: 너무 크지 않게, 대신 가독성은 유지 */
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans KR", "Hiragino Kaku Gothic ProN", Meiryo, Arial, sans-serif;

  --text: 15px;          /* 기본 텍스트 */
  --text-sm: 13px;       /* 설명/보조 */
  --h1: 22px;            /* 큰 제목 */
  --h2: 17px;            /* 섹션 제목 */
  --line: 1.55;

  /* 여백: 너무 큼직하지 않게 */
  --pad: 16px;
  --pad-sm: 12px;
  --radius: 14px;

  --bg: #f6f7fb;
  --card: #ffffff;
  --border: #e7e9f1;
  --muted: #6b7280;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;

  --danger: #dc2626;
  --success: #16a34a;
}

*{ box-sizing:border-box; }
html,body{
  margin:0; padding:0;
  font-family: var(--font);
  font-size: var(--text);
  line-height: var(--line);
  color:#111827;
  background: var(--bg);
}

/* 상단바 */
.topbar{
  position:sticky;
  top:0;
  z-index:10;
  background:#ffffffcc;
  backdrop-filter: blur(8px);
  border-bottom:1px solid var(--border);
}

.nav{
  max-width: 1100px;
  margin:0 auto;
  padding: 10px 14px;
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap:wrap;
}

.brand{
  font-weight:800;
  letter-spacing:.2px;
  margin-right:6px;
}

.badge{
  font-size: var(--text-sm);
  color:#374151;
  background:#f3f4f6;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid #e5e7eb;
}

.nav a{
  text-decoration:none;
  color:#111827;
  padding:8px 10px;
  border-radius:10px;
  font-weight:650;
}
.nav a:hover{
  background:#f3f4f6;
}

/* 레이아웃 */
.container{
  max-width:1100px;
  margin: 16px auto;
  padding: 0 14px 20px;
}

.grid{
  display:grid;
  gap:14px;
}
.grid-2{
  grid-template-columns: 1fr;
}
@media(min-width: 980px){
  .grid-2{
    grid-template-columns: 1fr 1fr;
  }
}

/* 카드 */
.card{
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--pad);
  box-shadow: 0 4px 14px rgba(17,24,39,.04);
}

.sep{
  border:0;
  border-top:1px solid var(--border);
  margin: 12px 0;
}

/* 제목 */
.h1{
  font-size: var(--h1);
  font-weight: 850;
  margin: 0 0 4px 0;
}
.h2{
  font-size: var(--h2);
  font-weight: 800;
  margin: 0 0 6px 0;
}
.small{
  font-size: var(--text-sm);
  color: var(--muted);
}
.muted{
  font-size: var(--text-sm);
  color: var(--muted);
}

/* 폼 */
label{
  display:block;
  font-weight: 750;
  margin-bottom: 6px;
  color:#111827;
}

input, select, textarea{
  width:100%;
  font-family: var(--font);
  font-size: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  border:1px solid #d9dce8;
  background:#fff;
  outline:none;
}
input:focus, select:focus, textarea:focus{
  border-color:#93c5fd;
  box-shadow: 0 0 0 4px rgba(59,130,246,.15);
}

.form-row{
  margin-bottom: 10px;
}

/* 버튼 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding: 9px 12px;
  border-radius: 12px;
  border:1px solid #d9dce8;
  background:#fff;
  color:#111827;
  font-weight: 800;
  text-decoration:none;
  cursor:pointer;
  user-select:none;
}
.btn:hover{
  background:#f3f4f6;
}
.btn-primary{
  border-color: transparent;
  background: var(--primary);
  color:#fff;
}
.btn-primary:hover{
  background: var(--primary-hover);
}

/* 알림 */
.alert{
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 750;
  border: 1px solid var(--border);
}
.alert.success{
  background: #ecfdf5;
  border-color: #bbf7d0;
  color:#065f46;
}
.alert.error{
  background: #fef2f2;
  border-color: #fecaca;
  color:#7f1d1d;
}

/* 표 */
.table{
  width:100%;
  border-collapse: collapse;
  overflow:hidden;
  border-radius: 12px;
  border:1px solid var(--border);
}
.table thead th{
  text-align:left;
  background:#f3f4f6;
  font-size: var(--text-sm);
  padding: 10px 10px;
  border-bottom:1px solid var(--border);
}
.table td{
  padding: 10px 10px;
  border-bottom:1px solid #eef0f6;
  vertical-align: top;
}
.table tr:hover td{
  background:#fafafa;
}

/* key-value */
.kv{
  display:grid;
  grid-template-columns: 140px 1fr;
  gap:8px 12px;
}
.kv .k{
  font-size: var(--text-sm);
  color: var(--muted);
  font-weight: 800;
}
.kv .v{
  font-weight: 750;
  color:#111827;
  word-break: break-word;
}

/* footer */
.footer{
  max-width:1100px;
  margin: 0 auto;
  padding: 12px 14px 20px;
  color: var(--muted);
  font-size: var(--text-sm);
}