:root{--blue:#102a43;--orange:#f97316;--bg:#f4f7fb;--text:#172b4d;--muted:#6b7c93;--line:#e3e8ef}*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}.app{display:flex;min-height:100vh}aside{width:245px;background:linear-gradient(180deg,#0d2740,#102a43);color:white;padding:22px 15px;position:fixed;height:100vh}.brand{display:flex;gap:12px;align-items:center;padding:5px 8px 30px}.brand span{width:42px;height:42px;border-radius:12px;background:var(--orange);display:grid;place-items:center;font-weight:800}.brand b{display:block}.brand small{opacity:.65}nav{display:grid;gap:7px}.nav{border:0;background:transparent;color:#dce8f4;text-align:left;padding:13px;border-radius:10px;font-size:14px;cursor:pointer}.nav:hover,.nav.active{background:rgba(255,255,255,.12);color:#fff}.nav.active{border-left:3px solid var(--orange)}main{margin-left:245px;width:calc(100% - 245px);padding:25px 32px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}h1{font-size:25px;margin:0}h2{margin:0 0 18px}h3{margin-top:0}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card,.panel{background:white;border:1px solid var(--line);border-radius:14px;box-shadow:0 3px 12px rgba(16,42,67,.05)}.card{padding:20px}.card small{color:var(--muted)}.card strong{display:block;font-size:27px;margin-top:8px}.card.danger strong{color:#d94841}.welcome{margin-top:20px;padding:25px}.view{display:none}.view.active{display:block}.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.primary,button{border:0;border-radius:9px;padding:10px 14px;cursor:pointer}.primary{background:var(--orange);color:white;font-weight:700}.panel{padding:18px;overflow:auto}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:12px;border-bottom:1px solid var(--line);font-size:13px}th{color:var(--muted);font-weight:600}.search{margin-bottom:14px}input,select{width:100%;padding:11px;border:1px solid #ccd6e0;border-radius:8px;background:#fff;color:var(--text)}.formgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.formgrid label{display:grid;gap:6px;font-size:13px;font-weight:600}.formgrid button{grid-column:1/-1;justify-self:start}.formrow{display:flex;gap:10px;margin-bottom:15px}.formrow select{max-width:350px}.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);place-items:center;padding:20px;z-index:5}.modal.show{display:grid}.modalbox{background:white;border-radius:16px;padding:25px;max-width:620px;width:100%;position:relative}.close{position:absolute;right:14px;top:10px;background:none;font-size:25px}.modalbox h2{padding-right:30px}#toast{position:fixed;right:25px;bottom:25px;background:#102a43;color:#fff;padding:12px 17px;border-radius:9px;display:none;z-index:10}.tag{padding:4px 8px;border-radius:20px;background:#eaf2ff;font-size:11px}.money{font-weight:700}@media(max-width:850px){aside{width:70px}.brand div,.nav{font-size:0}.nav{height:45px;text-align:center}.brand{padding-left:0}main{margin-left:70px;width:calc(100% - 70px);padding:18px}.cards{grid-template-columns:repeat(2,1fr)}.formgrid{grid-template-columns:1fr}}.avatar{width:42px;height:42px;object-fit:cover;border-radius:50%;vertical-align:middle}.avatar.empty{display:inline-flex;align-items:center;justify-content:center;background:#e9eef5;color:#6b7280}
.loginbox{max-width:420px;text-align:center}.error{color:#d33}.headright{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.qrbox{padding:16px;text-align:center;border:1px dashed #bbb;border-radius:12px}.qrbox img{display:block;width:220px;height:220px;object-fit:contain;margin:12px auto}.avatar.empty{display:inline-flex;align-items:center;justify-content:center}.modal.show{display:flex}

.checkline{display:flex;align-items:center;justify-content:flex-start;gap:8px;font-size:12px}.checkline input{width:auto}

.deuda-cell{color:#d90429!important;font-weight:800}.qrbox{padding:14px;text-align:center;border:1px solid #ddd;border-radius:12px}.qrbox img{width:220px;height:220px;display:block;margin:8px auto}.hidden{display:none!important}

.admin-welcome{background:linear-gradient(135deg,#102a43,#173f63);color:#fff;border-radius:18px;padding:26px 30px;margin-bottom:18px;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:0 10px 28px rgba(16,42,67,.16)}.admin-welcome h2{margin:6px 0 8px;font-size:26px}.admin-welcome p{margin:0;opacity:.82}.admin-welcome img{width:78px;height:78px;object-fit:contain;background:#fff;border-radius:18px;padding:6px}.eyebrow{font-size:11px;letter-spacing:1.5px;color:#ffb37a;font-weight:800}.card span{display:block;color:var(--muted);font-size:11px;margin-top:7px}.quick-actions{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:18px 0}.quick-actions button{background:#fff;border:1px solid var(--line);box-shadow:0 3px 12px rgba(16,42,67,.05);font-weight:700;color:var(--text);min-height:58px}.quick-actions button:hover{border-color:var(--orange);transform:translateY(-1px)}@media(max-width:1050px){.quick-actions{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.admin-welcome{padding:20px}.admin-welcome img{width:60px;height:60px}.admin-welcome h2{font-size:21px}.quick-actions{grid-template-columns:1fr}.cards{grid-template-columns:1fr}}
/* V17 - INTERFAZ RESPONSIVA PROFESIONAL */
html{overflow-x:hidden}body{min-width:0;overflow-x:hidden}.app{width:100%;min-width:0}aside{z-index:20;transition:transform .25s ease, width .25s ease}main{min-width:0}.view{min-width:0}.panel{min-width:0}.panel table{min-width:720px}.panel:has(table){overflow-x:auto;-webkit-overflow-scrolling:touch}.toolbar{gap:12px;flex-wrap:wrap}.toolbar>*{min-width:0}.cards{min-width:0}.card{min-width:0}.card strong{overflow-wrap:anywhere}.formrow{flex-wrap:wrap}.formrow>*{min-width:0}.modal{overflow-y:auto}.modalbox{max-height:calc(100vh - 32px);overflow-y:auto}.headright{min-width:0}.headright>*{max-width:100%}
.mobile-topbar{display:none}
@media(max-width:900px){
 aside{width:230px;transform:translateX(-100%);box-shadow:8px 0 30px rgba(0,0,0,.22)}
 aside.mobile-open{transform:translateX(0)}
 main{margin-left:0;width:100%;padding:72px 18px 24px}
 .mobile-topbar{display:flex;position:fixed;z-index:15;top:0;left:0;right:0;height:58px;background:#102a43;color:#fff;align-items:center;justify-content:space-between;padding:0 14px;box-shadow:0 3px 14px rgba(0,0,0,.15)}
 .mobile-topbar button{background:#f97316;color:#fff;font-size:22px;width:42px;height:42px;padding:0}
 .mobile-topbar b{font-size:14px;letter-spacing:.4px}.mobile-topbar small{display:block;opacity:.7;font-size:10px}
 header{align-items:flex-start}.headright{justify-content:flex-end}
}
@media(max-width:700px){
 main{padding:70px 12px 18px}
 header{display:block;margin-bottom:18px}header h1{font-size:22px;margin-bottom:12px}.headright{justify-content:flex-start}
 .cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.card{padding:14px}.card strong{font-size:21px}
 .admin-welcome{display:block;padding:20px;border-radius:14px}.admin-welcome img{float:right;margin-top:-2px}.admin-welcome h2{font-size:20px;padding-right:70px}
 .quick-actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.quick-actions button{min-height:54px;padding:9px 7px;font-size:12px}
 .toolbar{display:block}.toolbar .primary,.toolbar button{width:100%;margin-top:8px}.toolbar h2{font-size:20px}
 .formgrid{grid-template-columns:1fr;gap:11px}.formgrid button{width:100%}.formrow{display:grid;grid-template-columns:1fr;gap:9px}.formrow select{max-width:none}
 .panel{padding:13px;border-radius:12px}.modal{padding:10px}.modalbox{padding:18px;border-radius:13px;width:100%;max-height:calc(100vh - 20px)}
 input,select,button{font-size:16px;min-height:44px}.nav{min-height:45px}
}
@media(max-width:430px){
 .cards{grid-template-columns:1fr}.quick-actions{grid-template-columns:1fr}.admin-welcome h2{font-size:18px}.admin-welcome p{font-size:12px}.eyebrow{font-size:9px}
 .card strong{font-size:23px}.panel{padding:10px}th,td{padding:9px;font-size:12px}
}
@media(min-width:901px){.mobile-topbar{display:none!important}}


/* V18: seguridad visual de pantalla de acceso */
.app-hidden{display:none!important}
#login{z-index:9999}
#login.show{display:flex!important}


/* V19: acceso en primer plano y sistema bloqueado detrás */
.login{display:none;position:fixed;inset:0;z-index:9999;align-items:center;justify-content:center;padding:20px;background:rgba(6,18,31,.62);backdrop-filter:blur(5px)}
#login.show{display:flex!important}
.loginbox{width:min(430px,94vw);background:#fff;border-radius:20px;padding:28px;box-shadow:0 25px 70px rgba(0,0,0,.35);border:1px solid rgba(255,255,255,.45)}
.loginlogo{width:88px;height:88px;object-fit:contain;margin:0 auto 12px;display:block}
.loginbox form{display:grid;gap:12px;margin-top:20px}
.loginbox .check{display:flex;align-items:center;gap:8px;justify-content:flex-start;font-size:12px;font-weight:700}.loginbox .check input{width:auto}
#loginError{min-height:22px;color:#c62828;font-weight:700;font-size:12px;margin-top:10px}
.access-locked #app,.access-locked .mobile-topbar{pointer-events:none;user-select:none;filter:blur(2px);opacity:.58}
.access-locked #app{height:100vh;overflow:hidden}
.access-enabled #app,.access-enabled .mobile-topbar{pointer-events:auto;user-select:auto;filter:none;opacity:1}
.muted-note{color:var(--muted);font-size:12px;margin-top:-8px}
#periodosPagados table{min-width:880px}


/* V20: ventanas al frente, mensualidad visible y cobros con pago de pendientes */
.modal{z-index:5000!important;background:rgba(5,17,30,.58);backdrop-filter:blur(4px)}
.modal.show{display:flex!important;align-items:center;justify-content:center}
.modalbox{z-index:5001;box-shadow:0 28px 90px rgba(0,0,0,.38);border:1px solid rgba(255,255,255,.55)}
.modalbox input:focus,.modalbox select:focus{outline:2px solid rgba(249,115,22,.28);border-color:var(--orange);box-shadow:0 0 0 4px rgba(249,115,22,.08)}
.cobros-hero{background:linear-gradient(135deg,#102a43,#173f63);color:#fff;border-radius:18px;padding:22px 26px;margin-bottom:16px;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:0 10px 28px rgba(16,42,67,.16)}
.cobros-hero h2{margin:5px 0 6px}.cobros-hero p{margin:0;opacity:.82;font-size:13px}.cobros-hero img{width:78px;height:78px;object-fit:contain;background:#fff;border-radius:16px;padding:6px}
.payment-modal-head{display:flex;align-items:center;gap:14px;margin-bottom:16px;padding-right:28px}.payment-modal-head img{width:58px;height:58px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px}.payment-modal-head h2{margin:2px 0 0}
.pay-pending{background:var(--orange);color:#fff;font-weight:800;white-space:nowrap}.pay-pending:hover{filter:brightness(.95);transform:translateY(-1px)}
.paid-ok{color:#178344;font-weight:800;font-size:12px}
#alumnosTable td:nth-child(5){font-weight:800;color:#102a43;white-space:nowrap}
@media(max-width:700px){.cobros-hero{padding:18px}.cobros-hero img{width:58px;height:58px}.cobros-hero p{font-size:11px}.payment-modal-head img{width:50px;height:50px}}


/* V21: QR Banco Unión y pago exacto de saldos pendientes */
.qrbox.qr-banco{grid-column:1/-1;background:#fff;border:2px solid #e4eaf1;padding:18px;border-radius:16px}
.qrbox.qr-banco p{margin:0 0 10px;color:#102a43;font-weight:900}
.qrbox.qr-banco img{width:min(390px,100%);height:auto;max-height:none;object-fit:contain;margin:10px auto 12px;border-radius:10px;background:#fff}
.qr-payment-detail{margin:8px auto 10px;padding:10px 12px;border-radius:10px;background:#f4f7fb;color:#102a43;font-size:13px;font-weight:700;max-width:520px}
.pending-row{background:#fffaf6}.pending-row:hover{background:#fff4ea}.pending-row .deuda-cell{font-size:14px}
#pagoMonto[readonly],#pagoPeriodo[readonly]{background:#f1f4f8;font-weight:800;color:#102a43;cursor:not-allowed}
.payment-modalbox{max-width:760px}
@media(max-width:700px){.qrbox.qr-banco{padding:12px}.qrbox.qr-banco img{width:100%}.pay-pending{white-space:normal}}


/* V22 - comprobante QR, reportes por rango y resumen financiero */
.report-filters{border-left:4px solid var(--orange)}
.report-cards{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin:14px 0}
.report-card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:15px;box-shadow:0 7px 20px rgba(16,42,67,.07)}
.report-card small{display:block;font-weight:800;color:var(--muted);font-size:10px}.report-card strong{display:block;font-size:22px;margin:5px 0;color:#102a43}.report-card span{font-size:11px;color:var(--muted)}
.report-card.danger strong{color:#c62828}.report-card.success strong{color:#16834b}.legacy-report{margin-top:18px}
.qr-comprobante-field{display:grid;gap:6px;grid-column:1/-1;padding:12px;border:1px dashed #cbd5e1;border-radius:12px;background:#f8fafc;font-weight:800;color:#102a43}
.qr-comprobante-field small{font-weight:500;color:var(--muted)}
.comprobante-preview{grid-column:1/-1;min-height:10px}.comprobante-preview img{display:block;max-width:260px;max-height:180px;object-fit:contain;border:1px solid var(--line);border-radius:10px;padding:5px;background:#fff}
@media(max-width:1100px){.report-cards{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){.report-cards{grid-template-columns:1fr 1fr}.report-card strong{font-size:18px}.qr-comprobante-field{grid-column:1}.comprobante-preview{grid-column:1}}
@media(max-width:430px){.report-cards{grid-template-columns:1fr}}