:root{
  --p:#1565C0;--pd:#0D47A1;--pl:#42A5F5;
  --pc:#DBEAFE;--op:#fff;--opc:#1E3A5F;
  --surf:#F0F5FF;--card:#fff;
  --on:#1A1C1E;--onv:#42474E;
  --out:#72787F;--outv:#D1D9E8;
  --ok:#166534;--okb:#DCFCE7;
  --err:#B91C1C;--errb:#FEE2E2;
  --warn:#92400E;--warnb:#FEF3C7;
  --sb:#0A1628;--sb2:#111E35;
  --r8:8px;--r12:12px;--r16:16px;--r20:20px;--r24:24px;
  --sh1:0 1px 4px rgba(0,0,0,.10);
  --sh2:0 4px 16px rgba(0,0,0,.13);
  --sh3:0 8px 32px rgba(0,0,0,.20);
  --font:'Noto Sans Bengali','Segoe UI',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--surf);color:var(--on);height:100vh;overflow:hidden;font-size:13px;line-height:1.55}
button,input,select,textarea{font-family:var(--font)}
::-webkit-scrollbar{width:4px;height:4px}
::-webkit-scrollbar-thumb{background:var(--outv);border-radius:4px}

/* LAYOUT */
.app{display:flex;height:100vh;overflow:hidden}

/* SIDEBAR */
.sb{width:246px;background:var(--sb);display:flex;flex-direction:column;flex-shrink:0;overflow-y:auto;transition:transform .3s;z-index:300}
.sb-brand{padding:18px 16px 14px;background:var(--sb2);border-bottom:1px solid rgba(255,255,255,.08)}
.sb-logo{display:flex;align-items:center;gap:10px;margin-bottom:4px}
.sb-logo-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--p),var(--pl));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.sb-logo-text{color:#fff;font-weight:900;font-size:14px;line-height:1.2}
.sb-logo-sub{color:rgba(255,255,255,.45);font-size:10px;margin-top:3px}
.sb-inst{display:inline-block;background:rgba(99,179,237,.15);color:#63B3ED;font-size:9.5px;font-weight:700;padding:2px 8px;border-radius:20px;margin-top:4px;letter-spacing:.3px}
.sb-sec{padding:12px 16px 4px;font-size:9px;font-weight:800;letter-spacing:1.4px;color:rgba(255,255,255,.28);text-transform:uppercase}
.nav{display:flex;align-items:center;gap:10px;padding:9px 14px 9px 16px;color:rgba(255,255,255,.72);cursor:pointer;border-radius:0 26px 26px 0;margin:1px 10px 1px 0;font-size:12px;font-weight:500;transition:all .18s;border-left:3px solid transparent;user-select:none;-webkit-tap-highlight-color:transparent}
.nav:hover{background:rgba(255,255,255,.07);color:#fff}
.nav.on{background:var(--pc);color:var(--opc);font-weight:700;border-left-color:var(--p)}
.nav svg{width:17px;height:17px;flex-shrink:0;opacity:.85}
.nav.on svg{opacity:1}
.nav-badge{margin-left:auto;background:var(--err);color:#fff;font-size:9px;font-weight:800;padding:1px 6px;border-radius:20px;min-width:18px;text-align:center}
.sb-foot{padding:12px 16px;border-top:1px solid rgba(255,255,255,.07);margin-top:auto}
.sb-foot-text{color:rgba(255,255,255,.2);font-size:9.5px;line-height:1.6}
.sb-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:299}

/* MAIN */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}
.topbar{background:var(--card);border-bottom:1px solid var(--outv);padding:11px 16px;display:flex;align-items:center;gap:10px;flex-shrink:0;box-shadow:0 1px 0 var(--outv)}
.tb-info{flex:1;min-width:0}
.tb-title{font-size:15px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tb-sub{font-size:10px;color:var(--onv);margin-top:1px}
.content{flex:1;overflow-y:auto;padding:14px}
.menu-btn{display:none;background:none;border:none;padding:5px;border-radius:8px;cursor:pointer;color:var(--on);flex-shrink:0}

/* Month Bar */
.mbar{display:flex;align-items:center;gap:8px;background:var(--card);border-radius:var(--r12);padding:9px 14px;margin-bottom:12px;box-shadow:var(--sh1);flex-wrap:wrap;border:1px solid var(--outv)}
.msel{border:1.5px solid var(--outv);border-radius:var(--r8);padding:6px 10px;font-size:11.5px;background:var(--surf);cursor:pointer;font-family:var(--font);color:var(--on)}
.msel:focus{outline:none;border-color:var(--p)}

/* CARDS */
.card{background:var(--card);border-radius:var(--r16);padding:16px;box-shadow:var(--sh1);margin-bottom:12px;border:1px solid var(--outv)}
.ct{font-size:13px;font-weight:800;margin-bottom:12px;display:flex;align-items:center;gap:7px}
.ct .sub{font-size:10px;color:var(--onv);font-weight:500;margin-left:auto;cursor:pointer}
.ct .sub:hover{color:var(--p)}

/* Stat cards */
.sg{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:12px}
.sc{border-radius:var(--r16);padding:14px 15px;position:relative;overflow:hidden;border:1px solid rgba(0,0,0,.06)}
.sc-lb{font-size:10px;color:var(--onv);margin-bottom:5px;font-weight:600}
.sc-v{font-size:18px;font-weight:900;line-height:1.1}
.sc-s{font-size:9.5px;margin-top:5px;opacity:.65;font-weight:500}
.sc-ico{position:absolute;right:12px;top:12px;font-size:24px;opacity:.55}

/* Equation */
.eq{background:var(--card);border-radius:var(--r16);padding:14px 16px;margin-bottom:12px;box-shadow:var(--sh1);border-left:4px solid var(--p);border:1px solid var(--outv);border-left-width:4px}
.eq.bad{border-left-color:var(--err);background:#FFF5F5}
.eq-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:8px}
.eq-blk{text-align:center;min-width:80px}
.eq-lb{font-size:9.5px;color:var(--onv);margin-bottom:2px;font-weight:700;text-transform:uppercase;letter-spacing:.3px}
.eq-v{font-size:16px;font-weight:900}
.eq-op{font-size:22px;font-weight:200;color:var(--out)}
.eq-bar{margin-top:10px;height:8px;background:var(--outv);border-radius:6px;overflow:hidden;display:flex}
.eq-bl{background:#EF4444;transition:width .6s}
.eq-be{background:#16A34A;transition:width .6s}
.eq-leg{display:flex;gap:14px;margin-top:5px;font-size:10px}
.eq-tag{margin-left:auto;font-size:10px;font-weight:700;padding:3px 10px;border-radius:20px}

/* Buttons */
.fab{background:var(--p);color:#fff;border:none;border-radius:12px;padding:9px 16px;display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;box-shadow:0 3px 10px rgba(21,101,192,.3);cursor:pointer;transition:all .2s;white-space:nowrap}
.fab:hover{background:var(--pd);transform:translateY(-1px);box-shadow:0 5px 14px rgba(21,101,192,.38)}
.fab:active{transform:none}
.btn{border:1.5px solid var(--p);background:transparent;color:var(--p);border-radius:8px;padding:5px 11px;font-size:11px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:5px;transition:all .2s;white-space:nowrap}
.btn:hover{background:var(--pc)}
.btn.red{border-color:var(--err);color:var(--err)}
.btn.red:hover{background:var(--errb)}
.btn.green{border-color:var(--ok);color:var(--ok)}
.btn.green:hover{background:var(--okb)}
.mob-fab{display:none;position:fixed;bottom:18px;right:16px;width:52px;height:52px;border-radius:15px;background:var(--p);color:#fff;border:none;font-size:26px;box-shadow:var(--sh3);z-index:200;align-items:center;justify-content:center;cursor:pointer}

/* Chip */
.chip{display:inline-block;padding:2px 9px;border-radius:20px;font-size:10.5px;font-weight:700;white-space:nowrap}
.ci{background:#DCFCE7;color:#166534}
.ce{background:#FEE2E2;color:#B91C1C}
.ca{background:#DBEAFE;color:#1E3A5F}
.cl{background:#FEF3C7;color:#92400E}
.cd{background:#EDE9FE;color:#4C1D95}
.cp{background:#DCFCE7;color:#166534}
.cw{background:#FCE7F3;color:#831843}
.cs{background:#CFFAFE;color:#164E63}
.cbatch{background:#FFF7ED;color:#9A3412}
.cstudent{background:#F0FDF4;color:#14532D}

/* Table */
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;min-width:540px}
thead tr{background:linear-gradient(90deg,var(--opc),var(--pd))}
th{padding:9px 12px;text-align:left;font-size:10.5px;font-weight:800;color:#fff;letter-spacing:.3px;white-space:nowrap}
td{padding:9px 12px;font-size:12px;border-bottom:1px solid var(--outv);vertical-align:middle}
tr:last-child td{border-bottom:none}
tbody tr:hover td{background:#F0F6FF}
tfoot td{font-weight:800;background:var(--pc);font-size:12px;border-top:2px solid var(--opc)}

/* Grids */
.g2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.g3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.g4{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}

/* Form */
.fg{margin-bottom:12px}
.fl{display:block;font-size:10.5px;font-weight:700;color:var(--onv);margin-bottom:5px;letter-spacing:.2px}
.fi,.fs{width:100%;padding:9px 12px;border:1.5px solid var(--outv);border-radius:var(--r12);font-size:12.5px;font-family:var(--font);background:var(--surf);color:var(--on);transition:border-color .2s;-webkit-appearance:none;appearance:none}
.fi:focus,.fs:focus{outline:none;border-color:var(--p);background:#fff;box-shadow:0 0 0 3px rgba(21,101,192,.1)}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.f3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.finfo{background:var(--pc);border-radius:var(--r8);padding:10px 12px;font-size:11.5px;color:var(--opc);margin-bottom:12px;line-height:1.7}
.finfo.warn{background:var(--warnb);color:var(--warn)}

/* Modal */
.mo{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:1000;align-items:center;justify-content:center;padding:12px}
.mo.open{display:flex;animation:fadeIn .15s}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.mbox{background:var(--card);border-radius:var(--r24);padding:22px;width:100%;max-width:490px;max-height:92vh;overflow-y:auto;box-shadow:var(--sh3);animation:slideUp .22s ease}
.mbox.wide{max-width:640px}
@keyframes slideUp{from{transform:scale(.94) translateY(10px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}
.mh{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.mtit{font-size:16px;font-weight:800}
.mclose{background:var(--surf);border:none;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:16px;color:var(--onv);transition:background .2s}
.mclose:hover{background:var(--outv)}

/* Toast */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(80px);background:#1A1C1E;color:#fff;padding:11px 22px;border-radius:12px;font-size:12.5px;font-weight:700;box-shadow:var(--sh3);z-index:3000;transition:transform .28s ease;pointer-events:none}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.err{background:var(--err)}
.toast.ok{background:var(--ok)}
.toast.warn{background:#D97706}

/* Calculator */
.calc-wrap{display:none;position:fixed;bottom:76px;right:16px;z-index:500;background:var(--card);border-radius:var(--r20);box-shadow:var(--sh3);padding:14px;width:248px;border:1px solid var(--outv)}
.calc-wrap.open{display:block;animation:slideUp .2s ease}
.calc-scr{background:var(--sb);color:#60A5FA;border-radius:var(--r12);padding:10px 14px;font-size:22px;font-weight:800;text-align:right;min-height:52px;display:flex;align-items:center;justify-content:flex-end;word-break:break-all;font-family:'Courier New',monospace;letter-spacing:.5px;margin-bottom:10px}
.cg{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}
.ck{background:var(--surf);border:1px solid var(--outv);border-radius:8px;padding:9px 2px;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s;font-family:var(--font);color:var(--on)}
.ck:hover{background:var(--pc);border-color:var(--p);color:var(--pd)}
.ck:active{transform:scale(.93)}
.ck.op{background:#EFF6FF;color:var(--p);border-color:#BFDBFE}
.ck.eq{background:var(--p);color:#fff;border-color:var(--p);grid-column:span 2}
.ck.eq:hover{background:var(--pd)}
.ck.clr{background:var(--errb);color:var(--err);border-color:#FECACA}
.calc-btn{position:fixed;bottom:76px;right:16px;width:42px;height:42px;border-radius:13px;background:var(--opc);color:#60A5FA;border:none;font-size:20px;cursor:pointer;box-shadow:var(--sh2);z-index:499;display:flex;align-items:center;justify-content:center;transition:all .2s}
.calc-btn:hover{transform:scale(1.08);box-shadow:var(--sh3)}

/* Receipt */
.rcpt{background:#fff;padding:22px;border-radius:10px;border:1px solid var(--outv);font-size:12px;line-height:1.9}
.rcpt-logo{text-align:center;margin-bottom:14px;padding-bottom:12px;border-bottom:2px solid var(--opc)}
.rcpt-co{font-size:15px;font-weight:900;color:var(--opc)}
.rcpt-addr{font-size:10px;color:var(--onv);margin-top:2px}
.rcpt-title{text-align:center;font-size:13px;font-weight:800;background:var(--opc);color:#fff;padding:6px;border-radius:6px;margin:12px 0}
.rcpt-row{display:flex;justify-content:space-between;padding:4px 0;border-bottom:1px dashed var(--outv)}
.rcpt-row:last-child{border:none}
.rcpt-total{display:flex;justify-content:space-between;font-weight:900;padding:10px 0 0;border-top:2px solid var(--opc);margin-top:8px;font-size:14px}
.rcpt-footer{text-align:center;font-size:10px;color:var(--onv);margin-top:12px;padding-top:8px;border-top:1px solid var(--outv)}

/* Progress */
.pb-wrap{margin-bottom:9px}
.pb-row{display:flex;justify-content:space-between;font-size:10.5px;margin-bottom:3px}
.pb-bg{height:6px;background:var(--outv);border-radius:4px;overflow:hidden}
.pb-fill{height:100%;border-radius:4px;transition:width .6s}

/* FS styles */
.fs-hdr{text-align:center;border-bottom:2px solid var(--opc);padding-bottom:12px;margin-bottom:14px}
.fs-co{font-weight:900;font-size:15px;color:var(--opc)}
.fs-rep{font-size:12px;color:var(--onv)}
.fs-sec{font-weight:800;font-size:12.5px;padding:6px 10px;border-radius:6px;margin:12px 0 6px;display:flex;justify-content:space-between}
.fs-row{display:flex;justify-content:space-between;padding:6px 0 6px 14px;border-bottom:1px solid var(--outv);font-size:12.5px}
.fs-grp{display:flex;justify-content:space-between;padding:6px 0;font-weight:700;font-size:12.5px}
.fs-sub{display:flex;justify-content:space-between;font-weight:800;padding:9px 0;font-size:13px;border-top:2px solid var(--outv);margin-top:4px}
.fs-net{display:flex;justify-content:space-between;font-weight:900;font-size:16px;padding:12px;border-radius:12px;margin-top:12px}

/* Error card */
.errc{border-radius:var(--r12);padding:12px 14px;margin-bottom:10px;display:flex;gap:10px;align-items:flex-start;border-left:4px solid var(--err);background:var(--errb)}
.errc.w{border-left-color:var(--warn);background:var(--warnb)}

/* Asset */
.ast-item{border:1.5px solid var(--outv);border-radius:var(--r12);padding:14px;margin-bottom:10px;position:relative;overflow:hidden}
.ast-item::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--p)}

/* Loan/Pay */
.list-item{background:var(--surf);border:1px solid var(--outv);border-radius:var(--r12);padding:12px 14px;margin-bottom:8px;display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}

/* Batch/Student */
.batch-card{border:1.5px solid var(--outv);border-radius:var(--r12);padding:14px;margin-bottom:10px;position:relative}
.batch-card::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;border-radius:4px 0 0 4px;background:linear-gradient(180deg,var(--p),var(--pl))}

/* Closing */
.step{background:var(--surf);border:1px solid var(--outv);border-radius:var(--r12);padding:12px 14px;margin-bottom:8px;display:flex;gap:12px;align-items:flex-start}
.step-n{width:28px;height:28px;background:var(--p);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:12px;flex-shrink:0;margin-top:1px}

/* Responsive */
@media(max-width:1024px){.sg{grid-template-columns:repeat(2,1fr)}.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.g2,.g3{grid-template-columns:1fr}.f2,.f3{grid-template-columns:1fr}.sg{grid-template-columns:1fr 1fr}}
@media(max-width:640px){
  .sb{position:fixed;top:0;left:0;bottom:0;transform:translateX(-100%);box-shadow:var(--sh3)}
  .sb.open{transform:translateX(0)}
  .sb-overlay.open{display:block}
  .menu-btn{display:flex}
  .topbar .fab{display:none}
  .mob-fab{display:flex}
  .content{padding:10px}
  .sg{grid-template-columns:1fr 1fr;gap:8px}
  .sc{padding:11px}.sc-v{font-size:15px}.sc-ico{display:none}
  .card{padding:12px}
  .mbox{padding:16px;border-radius:20px}
  .calc-wrap,.calc-btn{right:10px;bottom:76px}
  .mob-fab{bottom:16px;right:10px}
}
@media print{
  .sb,.topbar,.mob-fab,.calc-btn,.calc-wrap,.mo,.toast,.mbar,.fn-bar{display:none!important}
  .main,.content{overflow:visible;padding:0}
  body,.app{overflow:visible;height:auto}
  .card{box-shadow:none;border:1px solid #ddd;break-inside:avoid}
}