:root{
  --bg:#f4f7fb;--panel:#fff;--text:#17212b;--muted:#6b7280;--line:#e5e7eb;
  --accent:#0f766e;--accent-soft:#e6fffb;--danger:#b91c1c;--shadow:0 10px 28px rgba(15,23,42,.07);
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
.hidden{display:none!important}
.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px}
.auth-card{width:min(440px,100%);background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}
.brand-mark{width:54px;height:54px;border-radius:16px;background:var(--accent);color:white;display:grid;place-items:center;font-weight:800;letter-spacing:.04em;margin-bottom:16px}
.brand-mark.small{width:38px;height:38px;border-radius:12px;margin:0}
.auth-card h1{margin:0 0 8px;font-size:28px}
.auth-card p{margin:0 0 22px;color:var(--muted)}
label{display:block;font-size:13px;color:var(--muted);font-weight:600;margin-bottom:6px}
input,select,textarea{width:100%;border:1px solid var(--line);background:white;border-radius:12px;padding:11px 12px;outline:none}
input:focus,select:focus,textarea:focus{border-color:#7dd3fc;box-shadow:0 0 0 3px rgba(125,211,252,.18)}
textarea{min-height:90px;resize:vertical}
.auth-card input{margin-bottom:14px}
.auth-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:6px}
.message{min-height:20px;margin-top:12px;color:var(--muted);font-size:13px}
.btn{border:1px solid var(--line);border-radius:12px;padding:10px 14px;background:white;color:var(--text);font-weight:700}
.btn.primary{background:var(--accent);border-color:var(--accent);color:white}
.btn.secondary{background:#fff}
.btn.ghost{background:transparent}
.btn.danger{color:var(--danger);background:#fff}
.app{min-height:100vh;display:grid;grid-template-columns:240px 1fr}
.sidebar{background:#0f172a;color:white;padding:20px 16px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.sidebar-brand{display:flex;align-items:center;gap:10px;padding:4px 4px 22px}
.sidebar-brand strong{display:block}
.sidebar-brand span{display:block;color:#94a3b8;font-size:13px;margin-top:2px}
.sidebar nav{display:flex;flex-direction:column;gap:6px}
.nav-btn{border:0;background:transparent;color:#cbd5e1;text-align:left;border-radius:10px;padding:11px 12px;font-weight:700}
.nav-btn.active,.nav-btn:hover{background:#1e293b;color:white}
.sidebar-bottom{margin-top:auto;border-top:1px solid #334155;padding-top:16px}
.user-email{display:block;color:#94a3b8;font-size:12px;word-break:break-word;margin-bottom:10px}
.sidebar .btn{width:100%;border-color:#334155;color:#e2e8f0}
.content{padding:26px;min-width:0}
.topbar{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:22px}
.topbar h2{margin:0 0 4px;font-size:28px}
.topbar p{margin:0;color:var(--muted)}
.topbar-actions{display:flex;align-items:end;gap:8px;flex-wrap:wrap}
.inline-label{margin:0}
.inline-label input{margin-top:5px}
.page{display:none}
.page.active{display:block}
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:14px}
.metric-card,.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.metric-card{padding:18px}
.metric-card span{color:var(--muted);font-size:13px}
.metric-card strong{display:block;font-size:24px;margin-top:6px}
.panel{padding:18px;margin-bottom:14px}
.panel-head{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:16px}
.panel-head h3{margin:0;font-size:19px}
.panel-head p{margin:5px 0 0;color:var(--muted);font-size:13px}
.panel-actions{display:flex;gap:8px;flex-wrap:wrap}
.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.breakdown .row,.item-list .row,.preview .row{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.breakdown .row:last-child,.item-list .row:last-child,.preview .row:last-child{border-bottom:0}
.form-card{background:#f8fafc;border:1px dashed #cbd5e1;border-radius:16px;padding:16px;margin-bottom:18px}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.form-grid .full{grid-column:1/-1}
.form-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}
.preview{background:white;border:1px solid var(--line);border-radius:14px;padding:12px;margin-top:14px}
.preview .total{font-size:17px;font-weight:800}
.notice{background:#ecfeff;color:#155e75;border:1px solid #bae6fd;padding:13px;border-radius:12px;margin:16px 0}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{padding:12px 10px;border-bottom:1px solid var(--line);text-align:left;font-size:14px;vertical-align:middle}
th{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.pill{display:inline-block;border-radius:999px;padding:5px 9px;background:#eef2ff;font-size:12px}
.actions-cell{white-space:nowrap}
.inline-form{display:grid;grid-template-columns:1fr auto auto;gap:8px;margin-bottom:14px}
.inline-form select{width:auto}
.item-list .row{align-items:center}
.item-meta{color:var(--muted);font-size:12px}
.empty{padding:20px;color:var(--muted);text-align:center}
.positive{color:#047857}
.negative{color:#b91c1c}
.toast{position:fixed;right:20px;bottom:20px;z-index:50;background:#111827;color:white;padding:12px 16px;border-radius:12px;box-shadow:var(--shadow)}
@media(max-width:1000px){
  .metrics-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:800px){
  .app{grid-template-columns:1fr}
  .sidebar{position:static;height:auto;padding:12px}
  .sidebar-brand{padding-bottom:10px}
  .sidebar nav{display:grid;grid-template-columns:repeat(5,1fr);overflow:auto}
  .nav-btn{text-align:center;padding:9px;font-size:13px;white-space:nowrap}
  .sidebar-bottom{display:flex;align-items:center;gap:10px;margin-top:10px;padding-top:10px}
  .sidebar .btn{width:auto}
  .user-email{margin:0;flex:1}
  .content{padding:16px}
  .topbar{align-items:flex-start;flex-direction:column}
  .two-columns,.form-grid{grid-template-columns:1fr}
  .form-grid .full{grid-column:auto}
}
@media(max-width:520px){
  .metrics-grid{grid-template-columns:1fr}
  .auth-actions{grid-template-columns:1fr}
  .inline-form{grid-template-columns:1fr}
  .inline-form select{width:100%}
}