:root{
  --ink:#17212b;
  --muted:#6b7280;
  --bg:#f4f7fb;
  --card:#ffffff;
  --brand:#182433;
  --brand-2:#243b53;
  --accent:#2f80ed;
  --danger:#c0392b;
  --line:#e5e7eb;
  --success:#18794e;
  --shadow:0 10px 24px rgba(15,23,42,.06);
  --radius:18px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Inter,Arial,sans-serif;background:var(--bg);color:var(--ink);overflow-x:hidden}
a{color:inherit}
img{max-width:100%;height:auto}

.shell{display:grid;grid-template-columns:270px minmax(0,1fr);min-height:100vh}
.sidebar{background:linear-gradient(180deg,#132032 0%,#17273b 100%);color:#fff;padding:22px 18px;position:sticky;top:0;height:100vh;overflow-y:auto}
.sidebar-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.sidebar-close{display:none;border:none;background:transparent;color:#fff;font-size:34px;line-height:1;cursor:pointer;padding:0 2px}
.brand{font-weight:800;font-size:22px;line-height:1.15;margin-bottom:24px}
.brand span{display:block;font-weight:400;font-size:12px;color:#afbdca;margin-top:7px}
.nav a{display:block;text-decoration:none;padding:12px 13px;margin:7px 0;border-radius:12px;color:#dbe5ee;font-weight:600}
.nav a:hover,.nav a.active{background:#26384b;color:#fff}

.main{padding:28px;min-width:0}
.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:22px}
.page-title{font-size:30px;font-weight:800;line-height:1.1}
.small{font-size:13px;color:var(--muted)}
.micro{font-size:11px;color:var(--muted);margin-top:5px}

.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.metric{font-size:30px;font-weight:800;margin-top:8px;line-height:1.1}
.metric.compact{font-size:21px}
.emphasis{border-color:#b8d3f8;background:linear-gradient(180deg,#fff,#f4f8ff)}

.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border:none;border-radius:12px;padding:11px 15px;font-weight:700;cursor:pointer;background:var(--brand-2);color:white;min-height:44px;white-space:nowrap}
.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.blue{background:var(--accent)}
.btn.danger{background:var(--danger)}
.btn.success{background:var(--success)}
.btn.whatsapp{background:#128c4f;color:#fff}
.small-btn{padding:9px 11px;font-size:12px;min-height:38px}

.table-wrap{overflow:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap;vertical-align:middle}
th{font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:#fafafa;position:sticky;top:0;z-index:1}
tr:last-child td{border-bottom:none}

.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}
.field input,.field select,.field textarea,
.actions input,.actions select,.inline-form input{
  width:100%;border:1px solid #d8dee8;border-radius:12px;padding:11px 12px;font:inherit;background:#fff;min-height:44px
}
.field textarea{min-height:90px;resize:vertical}
.span-2{grid-column:1/-1}
.inline-form{display:flex;gap:8px;flex-wrap:wrap}

.alert{padding:12px 14px;border-radius:12px;margin-bottom:16px;background:#eaf7ef;color:#17653d}
.alert.error{background:#fdecec;color:#a52a2a}
.pill{display:inline-block;padding:5px 10px;border-radius:999px;background:#edf2f7;font-size:12px;font-weight:700}
.pill.overdue{background:#fee2e2;color:#991b1b}.pill.active{background:#dcfce7;color:#166534}
.right{text-align:right}.mt{margin-top:18px}.mb{margin-bottom:18px}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:15px}.section-head h3{margin:0 0 5px}
.credit-text{color:var(--success)}
.notice{border-left:5px solid var(--accent)}
.notice h3{margin-top:0}.notice p{line-height:1.65}
.warning-box{padding:13px 14px;border:1px solid #f6d78b;background:#fff9e9;border-radius:12px;color:#795600}
.highlight{background:#f4f8ff;border-color:#b8d3f8}
.rule-chip{font-size:12px;font-weight:800;background:#fff3cd;color:#805b00;border:1px solid #ffe69c;padding:8px 12px;border-radius:999px;white-space:nowrap}

.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#122033,#243b53)}
.login-card{width:min(430px,100%);background:#fff;padding:28px;border-radius:18px;box-shadow:0 30px 70px rgba(0,0,0,.25)}
.login-card h1{margin:0 0 6px}

.statement-head{display:flex;justify-content:space-between;gap:20px;margin-bottom:24px}
.statement-title{font-size:28px;font-weight:800}
.summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0}
.summary-box{border:1px solid var(--line);border-radius:12px;padding:14px}
.summary-box b{display:block;font-size:19px;margin-top:4px}

.receipt-card{max-width:850px;margin:0 auto}
.receipt-number{font-size:13px;color:var(--muted);font-weight:700;margin-top:5px}
.receipt-address{margin-top:-12px;margin-bottom:18px;max-width:440px}
.receipt-amount{margin:22px 0;padding:22px;border-radius:16px;background:#f4f8ff;border:1px solid #b8d3f8;display:flex;align-items:center;justify-content:space-between;gap:20px}
.receipt-amount span{font-size:14px;color:var(--muted);font-weight:700}.receipt-amount strong{font-size:30px}
.receipt-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0}
.receipt-grid>div{border-bottom:1px solid var(--line);padding:8px 0 12px}.receipt-grid b,.receipt-grid span{display:block}
.receipt-notes{padding:14px;background:#fafafa;border:1px solid var(--line);border-radius:12px}
.receipt-footer{display:flex;justify-content:space-between;gap:20px;margin-top:32px;padding-top:18px;border-top:1px solid var(--line)}

.mobile-header,.mobile-overlay{display:none}
.no-print{}

@media(max-width:1100px){
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media(max-width:960px){
  .shell{display:block}
  .mobile-header{display:flex;align-items:center;gap:12px;padding:12px 16px;position:sticky;top:0;z-index:70;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 4px 12px rgba(15,23,42,.05)}
  .mobile-brand{display:flex;flex-direction:column;min-width:0}
  .mobile-brand strong{font-size:16px;line-height:1.1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mobile-brand span{font-size:12px;color:var(--muted)}
  .menu-toggle{width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:#fff;display:grid;place-items:center;cursor:pointer;flex:0 0 auto;padding:0}
  .menu-toggle span{display:block;width:18px;height:2px;background:var(--ink);margin:2px 0;border-radius:99px}
  .mobile-overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:79}
  body.nav-open .mobile-overlay{display:block}
  .sidebar{position:fixed;left:0;top:0;bottom:0;width:min(84vw,320px);height:100vh;z-index:80;transform:translateX(-105%);transition:transform .25s ease;box-shadow:0 24px 48px rgba(0,0,0,.28)}
  body.nav-open .sidebar{transform:translateX(0)}
  .sidebar-close{display:block}
  .main{padding:16px}
  .topbar{padding:0;gap:10px;align-items:flex-start;flex-direction:column}
  .page-title{font-size:28px}
  .grid,.summary-grid,.form-grid,.receipt-grid{grid-template-columns:1fr}
  .statement-head,.receipt-amount,.receipt-footer,.section-head{align-items:flex-start;flex-direction:column}
  .actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch}
  .actions > .btn,
  .actions > a.btn,
  .actions > button,
  .actions > form{width:100%;min-width:0}
  .actions form{display:flex;gap:8px;grid-column:1 / -1}
  .actions form input{flex:1}
  .table-wrap table{min-width:720px}
}

@media(max-width:620px){
  .main{padding:14px}
  .card{padding:16px;border-radius:16px}
  .page-title{font-size:24px}
  .metric{font-size:24px}
  .metric.compact{font-size:18px}
  .rule-chip{font-size:11px;padding:7px 10px;white-space:normal}
  .btn{padding:10px 12px;font-size:14px}
  .actions{grid-template-columns:1fr}
  .actions form{flex-direction:column}
  .table-wrap table{min-width:640px}
  th,td{padding:10px 12px}
}

@media print{
  .sidebar,.topbar,.no-print,.mobile-header,.mobile-overlay{display:none!important}
  .shell{display:block}
  .main{padding:0}
  .card,.table-wrap{box-shadow:none;border-color:#bbb}
  .statement-page{padding:10mm}
  .btn{display:none!important}
  body{background:#fff}
}