:root {
  --bg: #0A0E17;
  --surface: #111827;
  --surface-hover: #1A2332;
  --card: #151D2E;
  --border: #1E293B;
  --border-hover: #334155;
  --accent: #06D6A0;
  --accent-dim: rgba(6, 214, 160, .12);
  --warn: #FBBF24;
  --warn-dim: rgba(251, 191, 36, .12);
  --danger: #EF4444;
  --danger-dim: rgba(239, 68, 68, .12);
  --blue: #60A5FA;
  --blue-dim: rgba(96, 165, 250, .12);
  --purple: #A78BFA;
  --purple-dim: rgba(167, 139, 250, .12);
  --text: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --radius: 16px;
  --shadow: 0 20px 50px rgba(0,0,0,.28);
}
* { box-sizing: border-box; }
html, body, #app { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
a { color: var(--accent); }
.app-shell { min-height: 100%; }
.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 20%, rgba(6,214,160,.12), transparent 28%),
    radial-gradient(circle at 80% 10%, rgba(96,165,250,.12), transparent 24%),
    var(--bg);
}
.login-card {
  width: min(440px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
}
.logo-row { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--blue));
  color: var(--bg); display: grid; place-items: center; font-weight: 800;
}
.logo-title { font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.logo-subtitle { font-size: 11px; color: var(--text-tertiary); letter-spacing: .08em; }
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; }
.input, .textarea, .select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 12px 14px;
  outline: none;
}
.textarea { resize: vertical; min-height: 92px; }
.input:focus, .textarea:focus, .select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.btn {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  color: var(--text);
  background: var(--surface-hover);
  transition: transform .12s ease, opacity .12s ease, background .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--accent); color: var(--bg); font-weight: 700; }
.btn-danger { background: var(--danger-dim); color: var(--danger); }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-full { width: 100%; }
.main-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.sidebar-header { padding: 24px 20px 20px; border-bottom: 1px solid var(--border); }
.nav { padding: 12px 8px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  user-select: none;
}
.nav-item:hover { background: var(--surface-hover); }
.nav-item.active { background: var(--accent-dim); color: var(--accent); font-weight: 600; }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid var(--border); color: var(--text-tertiary); font-size: 11px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; margin-right: 8px; box-shadow: 0 0 12px rgba(6,214,160,.35); }
.content-wrap { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.header {
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.header-title { font-size: 18px; font-weight: 700; }
.header-subtitle { font-size: 12px; color: var(--text-tertiary); margin-top: 3px; }
.muted { color: var(--text-tertiary); font-size: 11px; }
.header-user { text-align: right; font-size: 12px; color: var(--text-secondary); }
.content { padding: 32px; overflow: auto; }
.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: 2fr 1fr; }
.grid-equal-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card:hover { border-color: var(--border-hover); }
.card-title { font-size: 14px; font-weight: 650; margin: 0 0 16px; }
.stat-label { font-size: 12px; color: var(--text-tertiary); letter-spacing: .05em; text-transform: uppercase; }
.stat-value { font-size: 28px; font-weight: 800; margin-top: 8px; font-variant-numeric: tabular-nums; }
.stat-sub { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }
.chart { height: 132px; display: flex; align-items: flex-end; gap: 3px; padding: 4px; }
.bar { flex: 1; min-width: 4px; border-radius: 4px 4px 0 0; background: rgba(6,214,160,.45); }
.table-wrap { overflow: auto; border-radius: var(--radius); border: 1px solid var(--border); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 12px 16px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
th { color: var(--text-tertiary); font-weight: 650; font-size: 12px; }
tr:hover td { background: var(--surface-hover); }
.badge { font-size: 11px; padding: 3px 10px; border-radius: 999px; display: inline-block; }
.badge-ok { background: var(--accent-dim); color: var(--accent); }
.badge-warn { background: var(--warn-dim); color: var(--warn); }
.badge-danger { background: var(--danger-dim); color: var(--danger); }
.badge-info { background: var(--blue-dim); color: var(--blue); }
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px;
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 18px;
  background: rgba(255,255,255,.01);
}
.dropzone.dragover { border-color: var(--accent); background: var(--accent-dim); }
.toolbar { display: flex; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.alert { margin-top: 14px; border-radius: 12px; padding: 12px 14px; font-size: 13px; }
.alert-danger { background: var(--danger-dim); color: #fecaca; border: 1px solid rgba(239,68,68,.35); }
.alert-info { background: var(--blue-dim); color: #bfdbfe; border: 1px solid rgba(96,165,250,.35); }
.spinner { display:inline-block; width: 14px; height: 14px; border: 2px solid rgba(255,255,255,.35); border-top-color: currentColor; border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -2px; margin-right: 6px; }
@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }
@media (max-width: 960px) {
  .main-layout { flex-direction: column; }
  .sidebar { width: 100%; min-height: auto; }
  .nav { display: flex; overflow-x: auto; }
  .nav-item { white-space: nowrap; }
  .grid-4, .grid-2, .grid-equal-2 { grid-template-columns: 1fr; }
  .content { padding: 20px; }
  .header { padding: 16px 20px; }
}