:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --line: #d7e0ea;
  --text: #1f2937;
  --muted: #64748b;
  --primary: #0f766e;
  --primary-soft: #ccfbf1;
  --danger: #b91c1c;
  --danger-soft: #fee2e2;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", Tahoma, sans-serif; background: linear-gradient(180deg, #eef6f6 0%, var(--bg) 140px); color: var(--text); }
button, input, select, textarea { font: inherit; }
.hidden { display: none !important; }
.layout { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }
.sidebar { background: #083344; color: #e6fffb; padding: 22px 16px; }
.brand { font-size: 22px; font-weight: 700; line-height: 1.3; margin-bottom: 22px; }
.brand small { display: block; font-size: 12px; color: #99f6e4; margin-top: 4px; }
.nav-link { width: 100%; display: block; border: 0; background: transparent; color: inherit; text-align: left; padding: 10px 12px; border-radius: 10px; cursor: pointer; margin-bottom: 6px; }
.nav-link.active, .nav-link:hover { background: rgba(255, 255, 255, 0.14); }
.sidebar-footer { margin-top: 24px; font-size: 13px; color: #a7f3d0; }
.main { padding: 20px 24px 28px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.topbar h1 { margin: 0; font-size: 28px; }
.subtle { color: var(--muted); font-size: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.panel { padding: 18px; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(180px, 1fr)); gap: 14px; margin-bottom: 18px; }
.stat-card { padding: 18px; }
.stat-label { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.stat-value { font-size: 30px; font-weight: 700; }
.content-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 18px; }
.toolbar { display: flex; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.toolbar-left, .toolbar-right { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.btn { border: 1px solid var(--line); background: #fff; color: var(--text); border-radius: 12px; padding: 10px 14px; cursor: pointer; }
.btn:hover { filter: brightness(0.99); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-soft { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.btn-sm { padding: 7px 10px; font-size: 13px; border-radius: 10px; }
.input, .select, .textarea { width: 100%; border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 10px 12px; }
.textarea { min-height: 88px; resize: vertical; }
.search { min-width: 280px; }
.table-wrap { overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #e5edf4; padding: 10px 8px; text-align: left; vertical-align: top; font-size: 14px; }
th { color: var(--muted); font-weight: 600; white-space: nowrap; }
.badge { display: inline-block; padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-muted { background: #e2e8f0; color: #475569; }
.grid-2, .grid-3, .grid-4 { display: grid; gap: 12px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.form-section { margin-bottom: 16px; }
.field label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--muted); }
.login-screen { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: 420px; padding: 28px; }
.login-title { margin: 0 0 8px; font-size: 28px; }
.login-note { margin-bottom: 18px; color: var(--muted); }
.loading { position: fixed; right: 20px; top: 20px; background: #111827; color: #fff; padding: 12px 16px; border-radius: 12px; z-index: 1000; }
.toast-container { position: fixed; right: 20px; bottom: 20px; display: grid; gap: 10px; z-index: 1001; }
.toast { min-width: 280px; padding: 12px 14px; border-radius: 12px; color: #fff; box-shadow: var(--shadow); }
.toast-success { background: #166534; }
.toast-error { background: var(--danger); }
.modal-backdrop { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.45); display: grid; place-items: center; z-index: 1002; }
.modal { width: min(860px, 92vw); max-height: 92vh; overflow: auto; background: #fff; border-radius: 18px; box-shadow: var(--shadow); padding: 20px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.section-title { margin: 0 0 10px; font-size: 18px; }
.notice { padding: 12px 14px; border-radius: 14px; background: #eff6ff; color: #1d4ed8; margin-bottom: 14px; }
.danger-row { background: #fff1f2; }
.two-columns { display: grid; grid-template-columns: 1.2fr 1fr; gap: 18px; }
.empty { padding: 24px; text-align: center; color: var(--muted); }
@media (max-width: 1100px) {
  .layout, .content-grid, .two-columns, .stats, .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main { padding: 16px; }
  .search { min-width: auto; width: 100%; }
}