:root {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #64748b;
  --line: #dbe3ef;
  --primary: #0f172a;
  --primary-soft: #e8eef9;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --success: #0f766e;
  --warning: #b45309;
  --danger: #b91c1c;
  --radius: 18px;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  background: #0f172a;
  color: white;
  padding: 26px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand-block {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 28px;
}
.brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, #60a5fa, #22c55e);
  display: grid;
  place-items: center;
  font-weight: 900;
  letter-spacing: -1px;
}
.brand-block h1 { margin: 0; font-size: 1.25rem; }
.brand-block p { margin: 3px 0 0; color: #cbd5e1; font-size: .88rem; }

.nav-tabs { display: grid; gap: 8px; }
.nav-link {
  width: 100%;
  border: 0;
  border-radius: 14px;
  background: transparent;
  color: #cbd5e1;
  padding: 13px 14px;
  text-align: left;
  transition: 0.2s ease;
}
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,0.12); color: #fff; }
.sidebar-card {
  margin-top: 24px;
  padding: 16px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
}
.small-label, .eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; color: var(--muted); margin: 0 0 4px; font-weight: 800; }
.sidebar-card .small-label { color: #94a3b8; }

.main-content { padding: 28px; min-width: 0; }
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  margin-bottom: 22px;
}
.topbar h2 { margin: 0; font-size: 2rem; letter-spacing: -0.04em; }
.top-actions, .hero-actions, .action-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.btn {
  border: 0;
  border-radius: 999px;
  padding: 11px 16px;
  font-weight: 800;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: white; box-shadow: 0 10px 24px rgba(37, 99, 235, .22); }
.btn.primary:hover { background: var(--accent-dark); }
.btn.secondary { background: var(--primary); color: white; }
.btn.ghost { background: var(--primary-soft); color: var(--primary); }
.file-label input { display:none; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.hero-card, .panel-card, .feature-card, .invoice-preview .document {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-card {
  padding: 30px;
  display: grid;
  grid-template-columns: minmax(0,1fr) 340px;
  gap: 28px;
  align-items: center;
  margin-bottom: 20px;
  overflow: hidden;
  position: relative;
}
.hero-card:after {
  content:"";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 300px;
  height: 300px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(37,99,235,.13), rgba(34,197,94,.12));
}
.hero-card h2 { margin: 0 0 8px; font-size: 2.6rem; letter-spacing: -0.06em; }
.hero-card p { color: var(--muted); max-width: 650px; }
.hero-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; position: relative; z-index: 1; }
.hero-stats div { background: #f8fafc; border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.hero-stats span { display:block; font-size: 1.35rem; font-weight: 900; }
.hero-stats small { color: var(--muted); }

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-bottom: 20px; }
.feature-card { padding: 20px; }
.feature-card h3 { margin: 0 0 8px; }
.feature-card p { margin: 0; color: var(--muted); line-height: 1.5; }
.feature-card span { display:block; font-size: 1.65rem; font-weight: 900; }
.feature-card small { color: var(--muted); }

.panel-card { padding: 22px; margin-bottom: 20px; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 18px; }
.section-heading h3 { margin: 0; letter-spacing: -0.02em; }
.section-heading.compact { margin-top: 18px; }

.two-column { display: grid; grid-template-columns: minmax(420px, 1fr) minmax(360px, .9fr); gap: 20px; align-items: start; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
label { display: grid; gap: 6px; color: var(--ink); font-weight: 800; font-size: .9rem; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  background: #f8fafc;
  color: var(--ink);
  outline: none;
}
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(37,99,235,.09); }

.line-tools { display: grid; grid-template-columns: 1fr auto auto; gap: 10px; align-items:end; margin: 18px 0 12px; }
.line-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }
.line-table input { min-width: 90px; padding: 9px; }
.line-table input.desc { min-width: 220px; }
.remove-line { background: #fee2e2; color: var(--danger); border: 0; border-radius: 10px; padding: 8px 10px; font-weight: 900; }
.totals-inputs { margin-top: 14px; }

.photo-upload-grid { display:grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
.upload-box {
  border: 2px dashed #bfdbfe;
  border-radius: 16px;
  padding: 22px;
  text-align:center;
  color: var(--accent);
  background: #eff6ff;
}
.upload-box input { margin-top: 10px; background:white; }
.photo-preview-wrap, .print-photo-columns { display:grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin-top: 14px; }
.photo-preview-wrap h4, .print-photo-columns h5 { margin: 0 0 8px; }
.photo-grid { display:grid; grid-template-columns: repeat(auto-fill, minmax(90px,1fr)); gap: 8px; }
.photo-card { border: 1px solid var(--line); border-radius: 12px; overflow:hidden; background:#fff; position: relative; }
.photo-card img { width:100%; height: 85px; object-fit: cover; display:block; }
.photo-card button { position:absolute; top:5px; right:5px; border:0; background:rgba(15,23,42,.82); color:white; border-radius:999px; width:24px; height:24px; }
.sticky-actions { position: sticky; bottom: 0; background: rgba(255,255,255,.95); border-top: 1px solid var(--line); padding-top: 14px; margin-top: 18px; backdrop-filter: blur(8px); }

.invoice-preview { position: sticky; top: 20px; }
.document { padding: 28px; }
.document-header { display:flex; justify-content: space-between; gap: 20px; border-bottom: 3px solid #0f172a; padding-bottom: 18px; }
.doc-brand { font-size: 1.5rem; font-weight: 950; letter-spacing: -0.04em; }
.document p { color: #475569; margin: 4px 0; line-height: 1.45; }
.doc-meta { text-align: right; }
.doc-meta h2 { margin: 0 0 8px; letter-spacing: .08em; }
.doc-info-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 22px 0; }
.document h4 { margin: 0 0 8px; }
.doc-notes { background:#f8fafc; border:1px solid var(--line); padding: 14px; border-radius:14px; margin-bottom: 18px; }
.preview-table th, .preview-table td { padding: 11px 0; }
.preview-table th:nth-child(2), .preview-table th:nth-child(3), .preview-table th:nth-child(4),
.preview-table td:nth-child(2), .preview-table td:nth-child(3), .preview-table td:nth-child(4) { text-align: right; }
.doc-total-grid { display:grid; grid-template-columns: 1fr 280px; gap: 18px; margin-top: 18px; align-items: start; }
.payment-box { background: #f8fafc; border:1px solid var(--line); border-radius:14px; padding:14px; }
.totals-box { border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.totals-box p { display:flex; justify-content: space-between; gap: 16px; margin: 8px 0; }
.totals-box .grand { border-top: 1px solid var(--line); padding-top: 10px; font-size: 1.15rem; color: var(--ink); }
.totals-box .balance { background: #ecfeff; border-radius: 10px; padding: 8px; color: var(--success); font-weight: 900; }
.print-photo-section { margin-top: 22px; }
.print-grid .photo-card img { height: 120px; }
.doc-footer { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 14px; display:flex; justify-content:space-between; gap:20px; font-size: .86rem; }

.saved-list { display:grid; gap: 10px; }
.empty-state { color: var(--muted); background: #f8fafc; border: 1px dashed var(--line); border-radius: 14px; padding: 18px; }
.saved-item { background: #f8fafc; border:1px solid var(--line); border-radius: 14px; padding: 14px; display:grid; grid-template-columns: 1fr auto; gap: 12px; align-items:center; }
.saved-item h4 { margin:0 0 4px; }
.saved-item p { margin:0; color:var(--muted); font-size: .92rem; }
.saved-actions { display:flex; gap:8px; flex-wrap:wrap; justify-content:flex-end; }
.status-pill { display:inline-flex; align-items:center; border-radius:999px; padding:4px 9px; font-size:.75rem; font-weight:900; background:#e2e8f0; color:#334155; }
.status-pill.Paid { background:#ccfbf1; color:#0f766e; }
.status-pill.Partial { background:#fef3c7; color:#b45309; }
.status-pill.Unpaid { background:#fee2e2; color:#b91c1c; }
.settings-note { margin-top: 18px; border-left: 4px solid var(--accent); background:#eff6ff; border-radius: 12px; padding: 14px; color:#1e3a8a; }
.toast { position: fixed; right: 22px; bottom: 22px; background:#0f172a; color:white; border-radius: 14px; padding: 13px 16px; opacity: 0; transform: translateY(10px); transition: .2s ease; pointer-events:none; z-index: 30; }
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 1080px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
  .nav-tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .nav-link { text-align:center; }
  .two-column, .hero-card { grid-template-columns: 1fr; }
  .invoice-preview { position: relative; top: 0; }
}

@media (max-width: 720px) {
  .main-content, .sidebar { padding: 18px; }
  .topbar, .section-heading, .document-header, .doc-footer { flex-direction: column; align-items: stretch; }
  .top-actions, .action-row { width: 100%; }
  .btn { width: 100%; }
  .grid-3, .form-grid, .hero-stats, .photo-upload-grid, .photo-preview-wrap, .print-photo-columns, .doc-info-grid, .doc-total-grid { grid-template-columns: 1fr; }
  .line-tools { grid-template-columns: 1fr; }
  .nav-tabs { grid-template-columns: 1fr 1fr; }
  .doc-meta { text-align: left; }
  .saved-item { grid-template-columns: 1fr; }
}

@media print {
  body { background:white; }
  .no-print, .sidebar, .topbar, .invoice-form, .toast { display:none !important; }
  .app-shell { display:block; }
  .main-content { padding:0; }
  .tab-panel { display:block !important; }
  #dashboard, #customers, #payments, #settings { display:none !important; }
  .two-column { display:block; }
  .invoice-preview { position:static; }
  .invoice-preview .document { box-shadow:none; border:0; border-radius:0; padding: 0; }
  @page { margin: 0.45in; }
}