:root{
  --ink:#0F172A;
  --ink-soft:#475569;
  --paper:#F0F4F8;
  --paper-raised:#FFFFFF;
  --primary:#0d6efd;
  --primary-dark:#0b5ed7;
  --gold:#F59E0B;
  --green:#059669;
  --line:#CBD5E1;
  --line-soft:#E2E8F0;
  --shadow:0 8px 24px rgba(15,23,42,0.08);
  --radius:10px;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:'Inter',sans-serif;
  background:var(--paper);
  color:var(--ink);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:'Plus Jakarta Sans',sans-serif;font-weight:700;margin:0;color:var(--ink);}
.mono{font-family:'IBM Plex Mono',monospace;}
button{font-family:'Inter',sans-serif;cursor:pointer;border:none;border-radius:8px;font-weight:600;font-size:14px;transition:transform .08s ease, box-shadow .15s ease;}
button:active{transform:translateY(1px);}
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
input,select,textarea{
  font-family:'Inter',sans-serif;
  border:1px solid var(--line);
  border-radius:8px;
  padding:10px 12px;
  font-size:14px;
  background:var(--paper-raised);
  color:var(--ink);
  width:100%;
}
label{font-size:12px;font-weight:600;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.04em;display:block;margin-bottom:6px;}
.btn-primary{background:var(--primary);color:#fff;padding:11px 20px;}
.btn-primary:hover{background:var(--primary-dark);}
.btn-ghost{background:transparent;color:var(--ink-soft);padding:10px 16px;border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--ink-soft);}
.btn-danger{background:transparent;color:#B23A1F;padding:8px 12px;border:1px solid #E7C2B5;}
.btn-danger:hover{background:#FBEAE3;}
.btn-sm{padding:7px 12px;font-size:13px;}
.hidden{display:none !important;}
a{color:var(--primary);text-decoration:none;}

.page-loading{overflow:hidden;}
.page-loader{
  position:fixed;
  inset:0;
  z-index:100;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(15,23,42,0.28);
  backdrop-filter:blur(2px);
}
.page-loader-card{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  padding:22px 26px;
  border-radius:14px;
  background:rgba(255,255,255,0.96);
  box-shadow:0 18px 40px rgba(15,23,42,0.16);
  color:var(--ink);
  min-width:180px;
}
.page-loader-spinner{
  width:32px;
  height:32px;
  border-radius:50%;
  border:3px solid rgba(13,110,253,0.18);
  border-top-color:var(--primary);
  animation:page-loader-spin .8s linear infinite;
}
.page-loader-text{
  font-size:14px;
  font-weight:600;
  text-align:center;
}
@keyframes page-loader-spin{
  to{transform:rotate(360deg);}
}

/* ---------- LOGIN ---------- */
#loginScreen{display:flex;min-height:100vh;}
.login-art{
  flex:1.1;
  background:var(--ink);
  color:var(--paper);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  padding:56px;
  position:relative;
  overflow:hidden;
}
.login-art::before{
  content:"";
  position:absolute;
  right:-120px;top:-120px;
  width:340px;height:340px;
  border:1px solid rgba(239,243,238,0.14);
  border-radius:50%;
}
.login-art::after{
  content:"";
  position:absolute;
  right:-40px;top:60px;
  width:220px;height:220px;
  border:1px solid rgba(239,243,238,0.1);
  border-radius:50%;
}
.brand-mark{font-family:'Plus Jakarta Sans',sans-serif;font-size:22px;font-weight:700;letter-spacing:.01em;display:flex;align-items:center;gap:10px;z-index:1;}
.brand-mark .stamp{
  width:30px;height:30px;border-radius:50%;border:1.5px solid var(--gold);
  display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--gold);
}
.brand-mark .brand-logo{
  width:45px;height:45px;border-radius:34%;object-fit:contain;
}
.login-tagline{z-index:1;max-width:420px;}
.login-tagline h1{font-size:42px;line-height:1.15;color:#fff;}
.login-tagline p{color:rgba(239,243,238,0.7);font-size:15px;margin-top:14px;line-height:1.6;}
.login-foot{font-size:12px;color:rgba(239,243,238,0.45);z-index:1;}
.login-form-wrap{
  flex:1;display:flex;align-items:center;justify-content:center;background:var(--paper);
}
.login-form{width:100%;max-width:360px;padding:24px;}
.login-form h2{font-size:26px;margin-bottom:6px;}
.login-form .sub{color:var(--ink-soft);font-size:14px;margin-bottom:26px;}
.field{margin-bottom:16px;}
.login-form .btn-primary{width:100%;margin-top:6px;padding:12px;}
.switch-mode{margin-top:18px;font-size:13px;color:var(--ink-soft);text-align:center;}
.form-msg{font-size:13px;padding:10px 12px;border-radius:8px;margin-bottom:14px;display:none;}
.form-msg.show{display:block;}
.form-msg.error{background:#FBEAE3;color:#B23A1F;}
.form-msg.success{background:#E6F0EA;color:var(--green);}
.helper-text{color:var(--ink-soft);font-size:12px;line-height:1.5;margin-top:8px;}
.inline-action-row{display:flex;gap:10px;align-items:center;}
.inline-action-row input{flex:1;}
.inline-action-row button{flex-shrink:0;}
.tc-row{display:flex;align-items:center;gap:8px;margin-bottom:14px;}
.tc-row input[type="checkbox"]{width:16px;height:16px;flex-shrink:0;cursor:pointer;accent-color:var(--primary);}
.tc-row .tc-label{font-size:13px;color:var(--ink-soft);text-transform:none;letter-spacing:0;font-weight:400;display:inline;margin:0;cursor:pointer;}
.tc-modal{max-width:600px;}
.tc-content{font-size:14px;line-height:1.7;color:var(--ink-soft);max-height:60vh;overflow-y:auto;padding-right:4px;}
.tc-content h3{font-size:14px;font-weight:700;color:var(--ink);margin:18px 0 6px;}
.tc-content p,.tc-content ul{margin:0 0 10px;}
.tc-content ul{padding-left:20px;}
.tc-content li{margin-bottom:4px;}

/* ---------- APP SHELL ---------- */
#appScreen{display:flex;min-height:100vh;}
.sidebar{
  width:230px;flex-shrink:0;background:var(--ink);color:var(--paper);
  display:flex;flex-direction:column;padding:28px 18px;
}
.sidebar .brand-mark{margin-bottom:36px;padding-left:6px;}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:8px;
  color:rgba(239,243,238,0.75);font-size:14px;font-weight:500;cursor:pointer;margin-bottom:4px;
}
.nav-item:hover{background:rgba(239,243,238,0.06);color:#fff;}
.nav-item.active{background:rgba(239,243,238,0.12);color:#fff;}
.nav-item .ic{width:18px;text-align:center;font-size:15px;}
.sidebar-foot{margin-top:auto;padding-top:18px;border-top:1px solid rgba(239,243,238,0.12);}
.user-email{font-size:12px;color:rgba(239,243,238,0.55);margin-bottom:10px;word-break:break-all;}
.signout-btn{background:transparent;color:rgba(239,243,238,0.75);border:1px solid rgba(239,243,238,0.2);padding:9px 12px;width:100%;font-size:13px;}
.signout-btn:hover{background:rgba(239,243,238,0.08);color:#fff;}

.main{flex:1;padding:36px 44px;max-width:1180px;}
.view{display:none;}
.view.active{display:block;}
.view-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:28px;}
.view-head h1{font-size:28px;}
.view-head .eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);font-weight:600;margin-bottom:6px;}

.card{background:var(--paper-raised);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;}
.empty-state{text-align:center;padding:60px 20px;color:var(--ink-soft);}
.empty-state .ic{font-size:34px;margin-bottom:10px;opacity:.5;}
.empty-state p{margin:4px 0;font-size:14px;}

table{width:100%;border-collapse:collapse;}
th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-soft);font-weight:600;padding:0 12px 12px;border-bottom:1px solid var(--line);}
td{padding:14px 12px;border-bottom:1px solid var(--line-soft);font-size:14px;}
tr:last-child td{border-bottom:none;}
td.num, th.num{text-align:right;font-family:'IBM Plex Mono',monospace;}
.row-actions{display:flex;gap:6px;justify-content:flex-end;}
.source-quote-tag{font-size:10px;font-family:'IBM Plex Mono',monospace;color:var(--ink-soft);font-weight:400;}

.badge{display:inline-block;padding:4px 10px;border-radius:20px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;}
.badge.draft{background:#EAE6DC;color:#7A6E4F;}
.badge.sent{background:#E4ECF5;color:#3B5C8A;}
.badge.paid{background:#E1EFE6;color:var(--green);}
.badge.overdue{background:#FBE3DD;color:#C44A29;}
.badge.accepted{background:#E1EFE6;color:var(--green);}
.badge.declined{background:#FBE3DD;color:#C44A29;}

.modal-overlay{position:fixed;inset:0;background:rgba(28,52,56,0.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px;}
.modal{background:var(--paper-raised);border-radius:var(--radius);max-width:480px;width:100%;padding:30px;max-height:88vh;overflow-y:auto;}
.modal h2{font-size:21px;margin-bottom:20px;}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:22px;}
.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}

/* Invoice builder */
.builder-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:22px;}
.line-items{margin:22px 0;}
.line-item-row,.quote-line-item-row{display:grid;grid-template-columns:2fr 0.7fr 1fr 0.8fr 1fr auto;gap:10px;align-items:end;margin-bottom:10px;}
.line-item-head{display:grid;grid-template-columns:2fr 0.7fr 1fr 0.8fr 1fr auto;gap:10px;margin-bottom:8px;}
.line-item-head span{font-size:11px;text-transform:uppercase;color:var(--ink-soft);font-weight:600;letter-spacing:.03em;}
.remove-line{background:transparent;color:#B23A1F;width:34px;height:34px;border-radius:8px;border:1px solid #E7C2B5;}
.add-line-btn{background:transparent;border:1px dashed var(--line);color:var(--ink-soft);padding:10px;width:100%;font-size:13px;}
.add-line-btn:hover{border-color:var(--primary);color:var(--primary);}
.totals-box{margin-top:18px;margin-left:auto;width:260px;}
.totals-row{display:flex;justify-content:space-between;padding:8px 0;font-size:14px;}
.totals-row.grand{border-top:1.5px solid var(--ink);margin-top:6px;padding-top:14px;font-weight:700;font-size:17px;}
.totals-row .val{font-family:'IBM Plex Mono',monospace;}

/* Invoice preview ("paper") */
.preview-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;}
.invoice-paper{
  background:#fff;max-width:720px;margin:0 auto;padding:56px 60px;
  box-shadow:var(--shadow);border-radius:2px;position:relative;
}
.invoice-paper::before{
  content:"";position:absolute;top:0;left:40px;right:40px;height:1px;
  background:repeating-linear-gradient(to right, var(--line) 0 6px, transparent 6px 12px);
}
.invoice-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:42px;}
.invoice-top .from h2{font-size:20px;}
.invoice-top .from p{font-size:13px;color:var(--ink-soft);margin:2px 0;}
.invoice-meta{text-align:right;}
.invoice-meta .num{font-family:'IBM Plex Mono',monospace;font-size:20px;font-weight:600;}
.invoice-meta .stamp-badge{margin-top:8px;}
.invoice-meta .dates{font-size:13px;color:var(--ink-soft);margin-top:10px;line-height:1.6;}
.bill-to{margin-bottom:32px;}
.bill-to .label{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-soft);font-weight:600;margin-bottom:6px;}
.bill-to .name{font-weight:600;font-size:15px;}
.bill-to p{font-size:13px;color:var(--ink-soft);margin:2px 0;}
.invoice-paper table th{font-size:11px;}
.invoice-paper .notes{margin-top:36px;font-size:13px;color:var(--ink-soft);border-top:1px solid var(--line-soft);padding-top:18px;}
.invoice-paper .totals-box{margin-top:8px;}

.archived-section{margin-top:24px;border-top:1px solid var(--line-soft);padding-top:16px;}
.archived-toggle{
  background:transparent;border:none;color:var(--ink-soft);font-size:13px;font-weight:600;
  padding:6px 0;cursor:pointer;display:flex;align-items:center;gap:6px;
}
.archived-toggle:hover{color:var(--ink);}
.archived-toggle::after{content:"▸";font-size:11px;transition:transform .15s;}
.archived-toggle.open::after{transform:rotate(90deg);}
.archived-row td{color:var(--ink-soft);}

/* ---------- REPORTING NAV SUBMENU ---------- */
.nav-parent{justify-content:space-between;user-select:none;}
.nav-arrow{font-size:11px;transition:transform .2s;opacity:.6;flex-shrink:0;}
.nav-parent.active .nav-arrow{transform:rotate(90deg);}
.nav-sub{display:none;padding-left:10px;margin-top:2px;margin-bottom:4px;}
.nav-sub.open{display:block;}
.nav-sub-item{
  display:flex;align-items:center;padding:7px 14px;border-radius:8px;
  color:rgba(239,243,238,0.6);font-size:13px;font-weight:500;cursor:pointer;margin-bottom:2px;
  border-left:2px solid rgba(239,243,238,0.1);
}
.nav-sub-item:hover{background:rgba(239,243,238,0.06);color:#fff;}
.nav-sub-item.active{background:rgba(239,243,238,0.10);color:#fff;border-left-color:var(--primary);}

/* ---------- REPORTS ---------- */
.report-filter-card{margin-bottom:20px;}
.report-filter-bar{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap;}
.report-filter-bar .field{margin-bottom:0;min-width:150px;}
.report-results{margin-top:4px;}
.report-summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:20px;}
.report-table-actions{display:flex;justify-content:flex-end;margin-bottom:14px;}

.customer-shell{max-width:1180px;margin:0 auto;padding:36px 44px;}
.customer-shell-head{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:28px;}
.customer-shell-sub{margin:8px 0 0;color:var(--ink-soft);font-size:14px;}
.customer-shell-actions{display:flex;flex-direction:column;align-items:flex-end;gap:10px;}
.customer-signout-btn{width:auto;min-width:120px;}
.customer-stats-grid{display:grid;grid-template-columns:repeat(4, minmax(0, 1fr));gap:16px;margin-bottom:24px;}
.stat-card{padding:22px;}
.stat-value{font-family:'Plus Jakarta Sans',sans-serif;font-size:28px;font-weight:700;margin-top:10px;}

/* ---------- TOGGLE SWITCH ---------- */
.toggle-row{display:flex;justify-content:space-between;align-items:center;gap:18px;}
.toggle-label{font-size:14px;font-weight:600;color:var(--ink);margin-bottom:2px;}
.toggle-switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0;cursor:pointer;}
.toggle-switch input{opacity:0;width:0;height:0;position:absolute;}
.toggle-slider{position:absolute;cursor:pointer;inset:0;background:var(--line);border-radius:24px;transition:.2s;}
.toggle-slider:before{content:"";position:absolute;height:18px;width:18px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.2);}
input:checked+.toggle-slider{background:var(--primary);}
input:checked+.toggle-slider:before{transform:translateX(20px);}

/* ---------- SCHEDULING TABS ---------- */
.sched-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:0;padding-bottom:0;}
.sched-tab{background:transparent;border:none;border-bottom:2px solid transparent;border-radius:0;padding:10px 18px;font-size:14px;font-weight:500;color:var(--ink-soft);cursor:pointer;margin-bottom:-1px;}
.sched-tab:hover{color:var(--ink);}
.sched-tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600;}
.sched-panel{display:none;}
.sched-panel.active{display:block;}

/* ---------- SESSION BADGES ---------- */
.badge.open{background:#E1EFE6;color:var(--green);}
.badge.full{background:#FBE3DD;color:#C44A29;}

/* ---------- SESSION VIEW TOGGLE ---------- */
.sess-view-toggle{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;}
.sess-view-btn{background:transparent;color:var(--ink-soft);border:none;border-radius:0;padding:8px 14px;font-size:13px;font-weight:500;}
.sess-view-btn:hover{background:var(--line-soft);}
.sess-view-btn.active{background:var(--primary);color:#fff;}

/* ---------- SESSION FILTER BAR ---------- */
.sess-filter-bar{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap;}
.sess-filter-bar .field{margin-bottom:0;min-width:120px;flex:1;}

/* ---------- SESSIONS CALENDAR ---------- */
.sched-calendar{padding:4px 0;}
.cal-nav{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.cal-month-label{font-size:15px;font-weight:700;flex:1;text-align:center;}
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:3px;}
.cal-header{text-align:center;font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-soft);font-weight:600;padding:6px 2px;}
.cal-cell{min-height:88px;background:var(--paper);border-radius:6px;padding:6px;overflow:hidden;}
.cal-cell-empty{background:transparent;min-height:0;}
.cal-day-num{font-size:12px;font-weight:600;color:var(--ink-soft);margin-bottom:4px;}
.cal-today .cal-day-num{width:22px;height:22px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:4px;}
.cal-session-chip{font-size:10px;font-weight:600;padding:2px 5px;border-radius:4px;margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer;display:block;}

@media print{
  body *{visibility:hidden;}
  #invoicePrintArea, #invoicePrintArea *{visibility:visible;}
  #quotePrintArea, #quotePrintArea *{visibility:visible;}
  #invoicePrintArea{position:absolute;top:0;left:0;width:100%;}
  #quotePrintArea{position:absolute;top:0;left:0;width:100%;}
  .invoice-paper{box-shadow:none;margin:0;max-width:100%;}
  .no-print{display:none !important;}
}

@media (max-width:880px){
  .sidebar{display:none;}
  .main{padding:22px;}
  #loginScreen{flex-direction:column;}
  .login-art{padding:32px;min-height:220px;}
  .login-tagline h1{font-size:30px;}
   .inline-action-row{flex-direction:column;align-items:stretch;}
  .builder-grid{grid-template-columns:1fr;}
  .line-item-row, .quote-line-item-row, .line-item-head{grid-template-columns:1fr;gap:6px;}
  .invoice-paper{padding:30px 20px;}
  .invoice-top{flex-direction:column;gap:18px;}
  .invoice-meta{text-align:left;}
   .customer-shell{padding:22px;}
   .customer-shell-head{flex-direction:column;}
   .customer-shell-actions{align-items:flex-start;}
   .customer-stats-grid{grid-template-columns:1fr;}
}