/* NexBill — Main Stylesheet */
:root {
  --blue:      #1B4FD8;
  --blue-l:    #EEF2FF;
  --blue-m:    #4F74E3;
  --gray-50:   #F8F9FC;
  --gray-100:  #F1F3F8;
  --gray-200:  #E2E6F0;
  --gray-400:  #9AA5BE;
  --gray-600:  #4B5675;
  --gray-900:  #111827;
  --green:     #059669;
  --green-l:   #ECFDF5;
  --amber:     #D97706;
  --amber-l:   #FFFBEB;
  --red:       #DC2626;
  --red-l:     #FEF2F2;
  --purple:    #534AB7;
  --purple-l:  #EEEDFE;
  --teal:      #0F6E56;
  --teal-l:    #E1F5EE;
  --coral:     #993C1D;
  --coral-l:   #FAECE7;
  --sidebar-w: 210px;
  --header-h:  54px;
  --radius:    8px;
  --radius-lg: 12px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 13px;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.5;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.app-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: #fff;
  border-right: 0.5px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
}

.main-wrap {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: var(--header-h);
  background: #fff;
  border-bottom: 0.5px solid var(--gray-200);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 90;
}

.page-content { padding: 20px; flex: 1; }

/* ── Sidebar ── */
.sb-logo {
  padding: 16px;
  border-bottom: 0.5px solid var(--gray-200);
}
.sb-brand { display: flex; align-items: center; gap: 9px; }
.sb-mark {
  width: 28px; height: 28px;
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.sb-name { font-size: 15px; font-weight: 600; }
.sb-sub  { font-size: 10px; color: var(--gray-400); margin-top: 1px; }

.sb-biz {
  padding: 10px 14px;
  background: var(--gray-50);
  border-bottom: 0.5px solid var(--gray-200);
  font-size: 11px;
}
.sb-biz strong { display: block; font-size: 12px; color: var(--gray-900); margin-bottom: 2px; }
.sb-biz span { color: var(--gray-400); }

.nav-section {
  font-size: 10px;
  color: var(--gray-400);
  padding: 12px 14px 3px;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--gray-600);
  border-left: 2px solid transparent;
  cursor: pointer;
  transition: all .1s;
  text-decoration: none;
}
.nav-item:hover { background: var(--gray-50); color: var(--gray-900); text-decoration: none; }
.nav-item.active {
  color: var(--blue);
  border-left-color: var(--blue);
  background: var(--blue-l);
  font-weight: 500;
}
.nav-icon { font-size: 14px; width: 18px; text-align: center; }
.nav-badge {
  margin-left: auto;
  background: var(--red);
  color: #fff;
  font-size: 9px;
  padding: 1px 5px;
  border-radius: 10px;
  font-weight: 600;
}

.sb-footer {
  margin-top: auto;
  padding: 12px 14px;
  border-top: 0.5px solid var(--gray-200);
}
.sb-user { display: flex; align-items: center; gap: 9px; }
.sb-avatar {
  width: 30px; height: 30px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; color: #fff;
}
.sb-uname { font-size: 12px; font-weight: 500; }
.sb-uemail { font-size: 10px; color: var(--gray-400); }

/* ── Topbar ── */
.topbar-title { font-size: 14px; font-weight: 600; flex: 1; }
.topbar-actions { display: flex; align-items: center; gap: 8px; }

/* ── Cards ── */
.card {
  background: #fff;
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 16px;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.card-title { font-size: 13px; font-weight: 600; color: var(--gray-600); }

/* ── Metric cards ── */
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.metric-card {
  background: #fff;
  border: 0.5px solid var(--gray-200);
  border-top: 3px solid var(--blue);
  border-radius: var(--radius-lg);
  padding: 14px;
}
.metric-label { font-size: 11px; color: var(--gray-400); font-weight: 500; margin-bottom: 6px; }
.metric-value { font-size: 20px; font-weight: 700; color: var(--gray-900); }
.metric-sub   { font-size: 11px; margin-top: 4px; color: var(--gray-400); }
.metric-up    { color: var(--green); }
.metric-dn    { color: var(--red); }
.metric-warn  { color: var(--amber); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border: 0.5px solid var(--gray-200);
  background: #fff;
  color: var(--gray-600);
  font-family: inherit;
  transition: all .12s;
  text-decoration: none;
}
.btn:hover { background: var(--gray-50); text-decoration: none; }
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: var(--blue-m); }
.btn-danger  { background: var(--red); color: #fff; border-color: var(--red); }
.btn-success { background: var(--green); color: #fff; border-color: var(--green); }
.btn-sm { padding: 5px 10px; font-size: 11px; }
.btn-icon { padding: 7px; }

/* ── Forms ── */
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; font-weight: 500; color: var(--gray-600); margin-bottom: 5px; }
.form-label .req { color: var(--red); }
.form-control {
  width: 100%;
  padding: 8px 10px;
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 13px;
  font-family: inherit;
  color: var(--gray-900);
  background: #fff;
  outline: none;
  transition: border-color .12s;
}
.form-control:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(27,79,216,.1); }
.form-control[readonly] { background: var(--gray-50); color: var(--gray-400); }
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 70px; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.form-grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 12px; }
.form-hint { font-size: 11px; color: var(--gray-400); margin-top: 3px; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; }
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.tbl th {
  text-align: left;
  color: var(--gray-400);
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 0.5px solid var(--gray-200);
  background: var(--gray-50);
  white-space: nowrap;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.tbl td {
  padding: 10px 10px;
  border-bottom: 0.5px solid var(--gray-100);
  color: var(--gray-600);
}
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: var(--gray-50); }
.tbl .hi { color: var(--blue); font-weight: 500; }
.tbl .num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl .actions { display: flex; gap: 6px; justify-content: flex-end; }

/* ── Badges ── */
.badge {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
}
.badge-green  { background: var(--green-l);  color: var(--green); }
.badge-amber  { background: var(--amber-l);  color: var(--amber); }
.badge-red    { background: var(--red-l);    color: var(--red); }
.badge-blue   { background: var(--blue-l);   color: var(--blue); }
.badge-purple { background: var(--purple-l); color: var(--purple); }
.badge-teal   { background: var(--teal-l);   color: var(--teal); }
.badge-gray   { background: var(--gray-100); color: var(--gray-600); }

/* ── Alert flash messages ── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.alert-success { background: var(--green-l); color: var(--teal); border: 0.5px solid #6EE7B7; }
.alert-danger  { background: var(--red-l);   color: #7F1D1D;     border: 0.5px solid #FCA5A5; }
.alert-warning { background: var(--amber-l); color: #78350F;     border: 0.5px solid #FCD34D; }
.alert-info    { background: var(--blue-l);  color: #1E3A8A;     border: 0.5px solid #93C5FD; }

/* ── Page header ── */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}
.page-title { font-size: 18px; font-weight: 700; color: var(--gray-900); }
.page-subtitle { font-size: 12px; color: var(--gray-400); margin-top: 3px; }
.page-actions { display: flex; gap: 8px; align-items: center; }

/* ── Invoice line items table ── */
.line-items-table { width: 100%; border-collapse: collapse; }
.line-items-table th {
  background: var(--gray-50);
  padding: 8px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-400);
  border-bottom: 0.5px solid var(--gray-200);
}
.line-items-table td { padding: 6px 4px; border-bottom: 0.5px solid var(--gray-100); }
.line-items-table input, .line-items-table select {
  width: 100%;
  padding: 5px 7px;
  border: 0.5px solid var(--gray-200);
  border-radius: 5px;
  font-size: 12px;
  font-family: inherit;
}
.line-items-table input:focus, .line-items-table select:focus {
  border-color: var(--blue);
  outline: none;
}
.line-items-table .del-row {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
}

/* ── Invoice totals box ── */
.invoice-totals {
  background: var(--gray-50);
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 14px;
  min-width: 280px;
}
.inv-total-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 12px;
  border-bottom: 0.5px solid var(--gray-200);
}
.inv-total-row:last-child { border-bottom: none; }
.inv-total-row.grand {
  font-size: 15px;
  font-weight: 700;
  color: var(--gray-900);
  padding-top: 10px;
  margin-top: 4px;
  border-top: 1.5px solid var(--gray-200);
}
.inv-total-row label { color: var(--gray-400); }
.inv-total-row span { font-weight: 500; font-variant-numeric: tabular-nums; }

/* ── Print invoice ── */
@media print {
  .sidebar, .topbar, .page-actions, .btn, .nav-item, .no-print { display: none !important; }
  .main-wrap { margin-left: 0; }
  .page-content { padding: 0; }
  body { font-size: 12px; }
}

/* ── Misc ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-1 { margin-top: 6px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 20px; }
.mb-1 { margin-bottom: 6px; }
.mb-2 { margin-bottom: 12px; }
.mb-3 { margin-bottom: 20px; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--gray-400); }
.text-sm { font-size: 11px; }
.fw-600 { font-weight: 600; }
.w-full { width: 100%; }
.divider { border: none; border-top: 0.5px solid var(--gray-200); margin: 16px 0; }

/* ── Login page ── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-50);
}
.login-card {
  background: #fff;
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 36px;
  width: 100%;
  max-width: 400px;
}
.login-logo { text-align: center; margin-bottom: 28px; }
.login-logo .mark {
  display: inline-flex;
  width: 44px; height: 44px;
  background: var(--blue);
  border-radius: 11px;
  align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800; color: #fff;
  margin-bottom: 10px;
}
.login-logo h1 { font-size: 22px; font-weight: 700; }
.login-logo p  { font-size: 12px; color: var(--gray-400); margin-top: 3px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .main-wrap { margin-left: 0; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .form-grid-3, .form-grid-4 { grid-template-columns: 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}