:root {
  --bg:        #07090f;
  --surface:   #0d1018;
  --surface2:  #131720;
  --border:    #1c2235;
  --border2:   #242d44;
  --blue:      #3a7cff;
  --blue-dim:  rgba(58,124,255,0.14);
  --blue-glow: rgba(58,124,255,0.35);
  --green:     #22c55e;
  --red:       #ff4f4f;
  --text:      #eef2ff;
  --muted:     #8899bb;
  --faint:     #3a4a6a;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;background:var(--bg);color:var(--text);font-family:'Plus Jakarta Sans',sans-serif;font-size:14px}
::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:2px}
#app{display:flex;min-height:100vh}
#sidebar{width:220px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding-bottom:24px}
#main{flex:1;overflow-y:auto;padding:40px 44px}
.sb-logo{padding:22px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px}
.sb-logo img{height:26px;object-fit:contain}
.sb-billing-tag{font-size:11px;color:var(--faint);margin-left:auto;font-weight:600}
.sb-label{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);padding:18px 20px 8px}
.sb-btn{display:flex;align-items:center;gap:10px;padding:10px 20px;border:none;background:none;color:var(--muted);font-family:inherit;font-size:13px;font-weight:500;cursor:pointer;transition:all .15s;width:100%;text-align:left;border-right:2px solid transparent}
.sb-btn:hover{color:var(--text);background:rgba(255,255,255,.04)}
.sb-btn.active{color:#fff;background:var(--blue-dim);border-right-color:var(--blue)}
.sb-icon{font-size:15px;width:20px;text-align:center}
.view{display:none}.view.active{display:block}
.page-header{margin-bottom:32px}
.page-header h1{font-size:26px;font-weight:800;letter-spacing:-.03em;margin-bottom:4px}
.page-header p{color:var(--muted);font-size:13px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:26px}
.card-title{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:18px}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:28px}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px 24px;position:relative;overflow:hidden}
.stat::after{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--blue),transparent)}
.stat-label{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin-bottom:10px}
.stat-value{font-size:30px;font-weight:800;letter-spacing:-.04em;line-height:1}
.stat-sub{font-size:12px;color:var(--faint);margin-top:6px}
.field{margin-bottom:16px}
.lbl{display:block;font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin-bottom:6px}
input,select{background:var(--surface2);border:1px solid var(--border2);border-radius:10px;padding:10px 13px;color:var(--text);font-family:inherit;font-size:13px;width:100%;outline:none;transition:border-color .2s,box-shadow .2s;-webkit-appearance:none}
input:focus,select:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-dim)}
input.err,select.err{border-color:var(--red)}
.errmsg{color:var(--red);font-size:11px;margin-top:4px;min-height:16px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
select option{background:var(--surface2)}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;transition:all .18s;border:none;line-height:1}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 4px 14px var(--blue-glow)}
.btn-blue:hover{filter:brightness(1.1);transform:translateY(-1px)}
.btn-outline{background:none;border:1px solid var(--border2);color:var(--muted)}
.btn-outline:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-dim)}
.btn-sm{padding:7px 13px;font-size:12px;border-radius:8px}
.btn-danger{background:none;border:1px solid var(--border2);color:var(--faint);width:36px;height:38px;border-radius:8px;cursor:pointer;font-size:18px;transition:all .15s;font-family:inherit}
.btn-danger:hover{border-color:var(--red);color:var(--red)}
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600}
.badge-unpaid{background:rgba(255,79,79,.1);color:#ff7070;border:1px solid rgba(255,79,79,.2)}
.badge-paid{background:rgba(34,197,94,.1);color:#22c55e;border:1px solid rgba(34,197,94,.2)}
hr.div{border:none;border-top:1px solid var(--border);margin:16px 0}
.trow{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;display:grid;align-items:center;cursor:pointer;transition:all .15s;margin-bottom:8px}
.trow:hover{border-color:var(--border2);background:var(--surface2)}
.avatar{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,#1a2550,#243060);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;color:var(--blue);flex-shrink:0}
.items-head{display:grid;grid-template-columns:1fr 70px 110px 36px;gap:8px;margin-bottom:6px}
.item-row{display:grid;grid-template-columns:1fr 70px 110px 36px;gap:8px;margin-bottom:8px;align-items:center}
.empty{text-align:center;padding:50px 20px;color:var(--muted)}
.empty-icon{font-size:34px;margin-bottom:10px}
.empty h3{font-weight:700;color:var(--text);margin-bottom:6px;font-size:15px}
.empty p{font-size:13px;margin-bottom:18px}
.inv-paper{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:50px 56px;position:relative;overflow:hidden;max-width:740px;margin:0 auto}
.inv-paper::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--blue),#66aaff,var(--blue))}
.inv-meta-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:36px}
.inv-meta-label{font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:5px}
.inv-meta-val{font-size:14px;font-weight:600}
.inv-items-head{display:grid;grid-template-columns:1fr 70px 100px 110px;padding:10px 16px;background:var(--surface2);border-radius:10px 10px 0 0;border:1px solid var(--border)}
.inv-items-head span{font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.inv-item-row{display:grid;grid-template-columns:1fr 70px 100px 110px;padding:13px 16px;border:1px solid var(--border);border-top:none;font-size:13px}
.inv-item-row:last-child{border-radius:0 0 10px 10px}
.inv-totals{display:flex;justify-content:flex-end;margin-top:26px}
.inv-totals-inner{width:260px}
.inv-total-row{display:flex;justify-content:space-between;padding:7px 0;font-size:13px;color:var(--muted);border-bottom:1px solid var(--border)}
.inv-grand{display:flex;justify-content:space-between;padding-top:14px;font-size:22px;font-weight:800;color:var(--blue);letter-spacing:-.03em}
.inv-footer-note{margin-top:40px;padding-top:18px;border-top:1px solid var(--border);text-align:center;font-size:11px;color:var(--faint);letter-spacing:.04em}
#toast{position:fixed;top:22px;right:22px;padding:12px 20px;border-radius:10px;font-weight:600;font-size:13px;z-index:9999;opacity:0;pointer-events:none;transition:all .25s;transform:translateY(-6px)}
#toast.show{opacity:1;pointer-events:auto;transform:translateY(0)}
#toast.success{background:var(--blue);color:#fff;box-shadow:0 8px 28px var(--blue-glow)}
#toast.error{background:var(--red);color:#fff}
.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg)}
.login-wrap{width:100%;max-width:400px;padding:20px}
.login-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:40px}
.login-logo{text-align:center;margin-bottom:24px}.login-logo img{height:34px}
.login-title{font-size:22px;font-weight:800;letter-spacing:-.03em;text-align:center;margin-bottom:4px}
.login-sub{text-align:center;color:var(--muted);font-size:13px;margin-bottom:28px}
.alert-error{background:rgba(255,79,79,.1);border:1px solid rgba(255,79,79,.3);color:#ff7070;padding:10px 14px;border-radius:10px;font-size:13px;margin-bottom:18px}
@media print{#sidebar,.no-print{display:none!important}#main{padding:0}.inv-paper{border:none;border-radius:0}.inv-paper::before{display:none}}
.toggle{position:relative;display:inline-block;width:46px;height:26px;flex-shrink:0}
.toggle input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;cursor:pointer;inset:0;background:#1e2a45;border-radius:26px;transition:.2s;border:1px solid var(--border2)}
.toggle-slider:before{content:'';position:absolute;width:18px;height:18px;left:3px;top:3px;background:var(--muted);border-radius:50%;transition:.2s}
.toggle.on .toggle-slider{background:var(--blue);border-color:var(--blue)}
.toggle.on .toggle-slider:before{transform:translateX(20px);background:#fff}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);display:none;align-items:center;justify-content:center;z-index:1000}
.modal-overlay.show{display:flex}
.modal{background:var(--surface);border:1px solid var(--border2);border-radius:16px;padding:32px;width:100%;max-width:500px;position:relative;max-height:90vh;overflow-y:auto}
.modal-title{font-size:16px;font-weight:800;letter-spacing:-.02em;margin-bottom:24px}
.modal-close{position:absolute;top:16px;right:16px;background:none;border:none;color:var(--muted);font-size:20px;cursor:pointer;width:32px;height:32px;border-radius:8px;transition:all .15s}
.modal-close:hover{background:var(--surface2);color:var(--text)}