/* ==========================================================
   InvoicePro Design System
   ========================================================== */

:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --border: #e6e8ef;
  --text: #171923;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;

  --success: #059669;
  --success-soft: #ecfdf5;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --info: #2563eb;
  --info-soft: #eff6ff;
  --neutral-soft: #f1f2f6;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16,24,40,0.04);
  --shadow-lg: 0 8px 24px rgba(16, 24, 40, 0.12);

  --sidebar-w: 248px;
  --topbar-h: 64px;
  --font: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

html[data-theme="dark"] {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1c2029;
  --border: #2a2e39;
  --text: #f1f2f6;
  --text-muted: #9aa1b1;
  --text-faint: #6b7280;
  --primary-soft: #1e2148;
  --success-soft: #062a20;
  --warning-soft: #2b1e04;
  --danger-soft: #2c0f0f;
  --info-soft: #0c1f39;
  --neutral-soft: #23262f;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0 0 4px; font-weight: 650; letter-spacing: -0.01em; }
p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; }

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

.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  position: fixed; top: 0; left: 0; bottom: 0;
  display: flex; flex-direction: column;
  z-index: 40;
  transition: transform .2s ease;
}
.sidebar-brand {
  height: var(--topbar-h);
  display: flex; align-items: center; gap: 10px;
  padding: 0 20px; border-bottom: 1px solid var(--border);
  font-weight: 700; font-size: 16px;
}
.sidebar-brand .logo-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 14px;
}
.sidebar-nav { flex: 1; overflow-y: auto; padding: 14px 12px; }
.sidebar-section-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-faint); margin: 16px 10px 6px; font-weight: 600;
}
.sidebar-link {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: var(--radius-sm);
  color: var(--text-muted); font-weight: 500; font-size: 13.5px;
  margin-bottom: 2px;
}
.sidebar-link svg { width: 18px; height: 18px; flex-shrink: 0; }
.sidebar-link:hover { background: var(--neutral-soft); color: var(--text); }
.sidebar-link.active { background: var(--primary-soft); color: var(--primary); }
.sidebar-footer { padding: 12px; border-top: 1px solid var(--border); }

.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  position: sticky; top: 0; z-index: 30;
}
.topbar-search {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 12px; width: 320px;
  color: var(--text-faint); font-size: 13px;
}
.topbar-right { display: flex; align-items: center; gap: 14px; }
.icon-btn {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); border: 1px solid transparent; background: transparent; cursor: pointer;
  color: var(--text-muted);
}
.icon-btn:hover { background: var(--neutral-soft); }
.avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px;
}
.menu-toggle { display: none; }

.page { padding: 24px; max-width: 1400px; width: 100%; margin: 0 auto; }
.page-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.page-header h1 { font-size: 22px; }
.page-header .subtitle { color: var(--text-muted); font-size: 13.5px; margin-top: 2px; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
}
.card-body { padding: 20px; }
.card-header {
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.card-header h3 { font-size: 15px; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.stat-card { padding: 18px 20px; }
.stat-card .stat-label { color: var(--text-muted); font-size: 12.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.stat-card .stat-value { font-size: 24px; font-weight: 700; margin-top: 6px; letter-spacing: -0.02em; }
.stat-card .stat-delta { font-size: 12.5px; margin-top: 6px; font-weight: 600; }
.stat-delta.up { color: var(--success); }
.stat-delta.down { color: var(--danger); }
.stat-icon {
  width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 10px;
}

.grid-2 { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: var(--radius-sm); font-size: 13.5px; font-weight: 600;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer; transition: all .12s ease; white-space: nowrap;
}
.btn:hover { background: var(--neutral-soft); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { opacity: .9; }
.btn-ghost { border-color: transparent; background: transparent; }
.btn-sm { padding: 6px 11px; font-size: 12.5px; }
.btn-block { width: 100%; }
.btn-icon { padding: 8px; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-hint { font-size: 12px; color: var(--text-faint); margin-top: 4px; }
input[type=text], input[type=email], input[type=password], input[type=number],
input[type=date], input[type=tel], input[type=search], input[type=url], input[type=file],
select, textarea {
  width: 100%; padding: 9px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-size: 13.5px; font-family: inherit;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
textarea { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.input-error { border-color: var(--danger) !important; }
.error-text { color: var(--danger); font-size: 12px; margin-top: 4px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
table.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th {
  text-align: left; padding: 11px 16px; color: var(--text-muted);
  font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em;
  border-bottom: 1px solid var(--border); white-space: nowrap;
}
.data-table td { padding: 13px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--surface-2); }
.table-toolbar { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; gap: 12px; flex-wrap: wrap; }
.table-filters { display: flex; gap: 10px; flex-wrap: wrap; }
.table-filters select, .table-filters input { width: auto; min-width: 150px; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 4px 10px;
  border-radius: 999px; font-size: 11.5px; font-weight: 700; text-transform: capitalize;
}
.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-info { background: var(--info-soft); color: var(--info); }
.badge-neutral { background: var(--neutral-soft); color: var(--text-muted); }

/* ---------- Empty states ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .empty-icon {
  width: 56px; height: 56px; border-radius: 16px; background: var(--primary-soft); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin: 0 auto 16px;
}
.empty-state h3 { color: var(--text); font-size: 16px; margin-bottom: 6px; }
.empty-state p { max-width: 340px; margin: 0 auto 18px; font-size: 13.5px; }

/* ---------- Modals ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15, 17, 21, 0.5);
  display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface); border-radius: var(--radius-lg); width: 100%; max-width: 480px;
  box-shadow: var(--shadow-lg); max-height: 90vh; overflow-y: auto;
  animation: modal-in .15s ease;
}
@keyframes modal-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.modal-header { padding: 18px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-header h3 { font-size: 16px; }
.modal-body { padding: 20px; }
.modal-footer { padding: 16px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* ---------- Toasts ---------- */
.toast-container { position: fixed; top: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 10px; }
.toast {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); padding: 13px 16px; min-width: 280px; display: flex; align-items: center; gap: 10px;
  animation: toast-in .18s ease;
  border-left: 3px solid var(--primary);
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateX(16px); } to { opacity: 1; transform: translateX(0); } }

/* ---------- Auth pages ---------- */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); padding: 20px; }
.auth-card { width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow); }
.auth-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; font-weight: 700; font-size: 18px; }

.error-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg); }
.error-box { text-align: center; }
.error-code { font-size: 64px; font-weight: 800; color: var(--primary); }

/* ---------- Misc ---------- */
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.mt-16 { margin-top: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .menu-toggle { display: flex; }
  .topbar-search { display: none; }
  .stat-grid { grid-template-columns: 1fr; }
  .page { padding: 16px; }
  .data-table th:nth-child(n+4), .data-table td:nth-child(n+4) { display: none; }
}