:root{
  --bg:#f4f6f9; --card:#fff; --line:#e3e7ec; --ink:#2c3338; --muted:#6a7480;
  --primary:#3b7ddd; --primary-d:#2f66b8; --sidebar:#1f2a44; --sidebar-2:#27324f;
  --ok-bg:#e7f6ec; --ok-ink:#1c6b3a; --err-bg:#fdecec; --err-ink:#a32626;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--primary);text-decoration:none}

/* layout */
.app{display:flex;min-height:100vh}
.sidebar{width:230px;background:var(--sidebar);color:#cdd5e4;flex-shrink:0}
.sidebar .brand{padding:18px 20px;font-size:18px;font-weight:600;color:#fff;border-bottom:1px solid var(--sidebar-2)}
.sidebar .brand small{display:block;font-size:11px;color:#8a94ac;font-weight:400;margin-top:2px}
.sidebar nav{padding:10px 0}
.sidebar nav a{display:flex;gap:10px;align-items:center;padding:10px 20px;color:#cdd5e4;font-size:14px}
.sidebar nav a:hover{background:var(--sidebar-2);color:#fff}
.sidebar nav a.active{background:var(--primary);color:#fff}
.sidebar nav .grp{padding:14px 20px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:#6c7794}

.main{flex:1;min-width:0}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:12px 22px;display:flex;justify-content:space-between;align-items:center}
.topbar .who{font-size:14px;color:var(--muted)}
.topbar .who b{color:var(--ink)}
.hamburger{display:none;background:none;border:0;font-size:22px;line-height:1;cursor:pointer;color:var(--ink);padding:2px 6px}
.nav-backdrop{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:40}
.content{padding:22px;max-width:1150px}

/* components */
h1{font-size:22px;margin:0 0 16px}
h2{font-size:16px;margin:0 0 14px;font-weight:600}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px;margin-bottom:20px}
.alert{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:14px}
.alert-ok{background:var(--ok-bg);color:var(--ok-ink);border:1px solid #b6e2c4}
.alert-err{background:var(--err-bg);color:var(--err-ink);border:1px solid #f3bdbd}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.grid .full,.grid-2 .full{grid-column:1/-1}
label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid #d6dbe1;border-radius:7px;font-size:14px;background:#fff;font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary)}

.btn{display:inline-block;padding:8px 16px;border:none;border-radius:7px;font-size:14px;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-d)}
.btn-light{background:#eef1f5;color:var(--ink)}
.btn-sm{padding:4px 10px;font-size:12px}
.actions{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px;border-bottom:1px solid #edf0f3}
th{background:#fafbfc;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.badge{font-size:11px;padding:2px 8px;border-radius:20px}
.b-active,.b-paid{background:var(--ok-bg);color:var(--ok-ink)}
.b-other,.b-unpaid{background:#f0f1f3;color:var(--muted)}
.b-partial{background:#fff4e0;color:#9a6a12}
.filters{display:flex;gap:10px;flex-wrap:wrap;align-items:end;margin-bottom:14px}
.filters>div{min-width:150px}
.muted{color:#97a0ab;font-size:13px}
.tabs{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.tabs a{padding:8px 14px;border-radius:7px;background:#eef1f5;color:var(--ink);font-size:14px}
.tabs a.active{background:var(--primary);color:#fff}

/* stat cards */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:20px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px}
.stat .n{font-size:26px;font-weight:600}
.stat .l{font-size:13px;color:var(--muted);margin-top:2px}

/* login */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--sidebar)}
.login-box{background:#fff;border-radius:12px;padding:30px;width:360px;max-width:92vw}
.login-box h1{text-align:center;font-size:20px}

@media(max-width:820px){
  .sidebar{position:fixed;top:0;left:0;height:100%;z-index:50;transform:translateX(-100%);transition:transform .25s ease;overflow-y:auto;box-shadow:2px 0 12px rgba(0,0,0,.2)}
  .sidebar.open{transform:translateX(0)}
  .hamburger{display:inline-block}
  .nav-backdrop.show{display:block}
  .grid,.stats{grid-template-columns:1fr 1fr}
  table{display:block;overflow-x:auto}
}

/* clean printing for reports */
@media print{
  .sidebar,.topbar,.tabs,.filters,.btn,.actions{display:none !important}
  .main{width:100%}
  .content{padding:0;max-width:none}
  .card{border:none;padding:0;margin:0 0 14px}
  body{background:#fff}
}

/* Accounting summary cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:12px}
.grid-3 .stat{margin:0}
.stat-label{font-size:13px;color:var(--muted)}
.stat-val{font-size:22px;font-weight:600;margin-top:4px}
@media(max-width:760px){.grid-3{grid-template-columns:1fr 1fr}}