/* ================================================
   Smart Invoice Pro – Main Stylesheet
   Professional SaaS UI with Plus Jakarta Sans
   ================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

/* ---- CSS VARIABLES ---- */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-mid: #BFDBFE;
  --accent: #0EA5E9;
  --success: #10B981;
  --success-light: #ECFDF5;
  --warning: #F59E0B;
  --warning-light: #FFFBEB;
  --danger: #EF4444;
  --danger-light: #FEF2F2;
  --purple: #8B5CF6;
  --dark: #0F172A;
  --dark-2: #1E293B;
  --dark-3: #334155;
  --gray: #64748B;
  --gray-2: #94A3B8;
  --gray-3: #CBD5E1;
  --light: #F8FAFC;
  --light-2: #F1F5F9;
  --border: #E2E8F0;
  --white: #FFFFFF;
  --sidebar-width: 260px;
  --topnav-height: 64px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s ease;
}

[data-theme="dark"] {
  --dark: #F1F5F9;
  --dark-2: #E2E8F0;
  --dark-3: #CBD5E1;
  --gray: #94A3B8;
  --gray-2: #64748B;
  --gray-3: #475569;
  --light: #1E293B;
  --light-2: #0F172A;
  --border: #334155;
  --white: #1E293B;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
}

/* ---- BASE ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  font-size: 14px;
  color: var(--dark);
  background: var(--light-2);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* ---- SIDEBAR ---- */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--dark-2);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto;
  overflow-x: hidden;
}
[data-theme="dark"] .sidebar { background: #0F172A; }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 8px;
}
.brand-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(37,99,235,0.4);
}
.brand-text { display: flex; flex-direction: column; }
.brand-name { font-size: 15px; font-weight: 800; color: white; line-height: 1; }
.brand-sub { font-size: 10px; color: rgba(255,255,255,0.4); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }

.sidebar-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: rgba(255,255,255,0.3);
  padding: 16px 20px 4px;
}

.sidebar-nav { padding: 0 10px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-weight: 500;
  font-size: 13.5px;
  transition: var(--transition);
  margin-bottom: 2px;
  position: relative;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: white; }
.nav-item.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}
.nav-item i { font-size: 16px; flex-shrink: 0; }
.nav-item span { flex: 1; }
.nav-badge {
  background: var(--danger);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 20px;
  min-width: 18px;
  text-align: center;
}
.nav-item.nav-logout { color: rgba(255,100,100,0.7); }
.nav-item.nav-logout:hover { background: rgba(239,68,68,0.15); color: #FCA5A5; }

.sidebar-bottom {
  margin-top: auto;
  padding: 8px 10px 16px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* ---- SIDEBAR OVERLAY ---- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* ---- MAIN WRAPPER ---- */
.main-wrapper {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ---- TOPNAV ---- */
.topnav {
  height: var(--topnav-height);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.topnav-left { display: flex; align-items: center; gap: 16px; }
.topnav-right { display: flex; align-items: center; gap: 8px; }
.page-title { font-size: 16px; font-weight: 700; color: var(--dark); }
.sidebar-toggle {
  background: none; border: 1px solid var(--border);
  border-radius: 8px; width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--gray);
  transition: var(--transition);
  display: none;
}
.sidebar-toggle:hover { background: var(--light); color: var(--dark); }
.icon-btn {
  background: none; border: 1px solid var(--border);
  border-radius: 8px; width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--gray); font-size: 15px;
  transition: var(--transition);
}
.icon-btn:hover { background: var(--light); color: var(--dark); }
.user-avatar {
  display: flex; align-items: center; gap: 8px;
  background: none; border: 1px solid var(--border);
  border-radius: 10px; padding: 6px 12px;
  cursor: pointer; color: var(--dark); font-size: 13px; font-weight: 600;
  transition: var(--transition); font-family: inherit;
}
.user-avatar:hover { background: var(--light); }
.avatar-circle {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 12px; font-weight: 800;
}

/* ---- PAGE CONTENT ---- */
.page-content { padding: 24px; flex: 1; }

/* ---- CARDS ---- */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.card-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  display: flex; align-items: center; justify-content: space-between;
  font-weight: 700; font-size: 14px; color: var(--dark);
}
.card-body { padding: 20px; }

/* ---- STAT CARDS ---- */
.stat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0;
}
.stat-icon.blue { background: var(--primary-light); color: var(--primary); }
.stat-icon.green { background: var(--success-light); color: var(--success); }
.stat-icon.amber { background: var(--warning-light); color: var(--warning); }
.stat-icon.red { background: var(--danger-light); color: var(--danger); }
.stat-icon.purple { background: #F3F0FF; color: var(--purple); }
.stat-label { font-size: 12px; font-weight: 600; color: var(--gray); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.stat-value { font-size: 24px; font-weight: 800; color: var(--dark); margin-bottom: 2px; }
.stat-sub { font-size: 12px; color: var(--gray-2); }
.stat-trend { font-size: 11px; font-weight: 600; }
.stat-trend.up { color: var(--success); }
.stat-trend.down { color: var(--danger); }

/* ---- TABLES ---- */
.table-wrapper { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--gray);
  padding: 10px 16px; border-bottom: 2px solid var(--border);
  background: var(--light); white-space: nowrap;
}
.data-table td {
  padding: 13px 16px; border-bottom: 1px solid var(--border);
  color: var(--dark); font-size: 13.5px;
  transition: background 0.15s;
}
.data-table tbody tr:hover td { background: var(--light); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* ---- BADGES ---- */
.badge {
  display: inline-flex; align-items: center;
  padding: 4px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.3px;
}
.badge-paid { background: var(--success-light); color: var(--success); }
.badge-unpaid { background: var(--danger-light); color: var(--danger); }
.badge-partial { background: var(--warning-light); color: #B45309; }
.badge-draft { background: var(--light-2); color: var(--gray); }
.badge-cancelled { background: #FFF1F0; color: #9B1D1D; }

/* ---- BUTTONS ---- */
.btn {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600; border-radius: 10px;
  transition: var(--transition); cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white; border: none;
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.4);
  color: white;
}
.btn-outline-primary { border: 2px solid var(--primary); color: var(--primary); background: transparent; }
.btn-outline-primary:hover { background: var(--primary-light); color: var(--primary); }
.btn-success { background: var(--success); color: white; border: none; box-shadow: 0 4px 12px rgba(16,185,129,0.3); }
.btn-success:hover { background: #059669; color: white; transform: translateY(-1px); }
.btn-danger { background: var(--danger); color: white; border: none; }
.btn-danger:hover { background: #DC2626; color: white; }
.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 8px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }

/* ---- FORMS ---- */
.form-control, .form-select {
  font-family: 'Plus Jakarta Sans', sans-serif;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--dark);
  background: var(--white);
  transition: var(--transition);
}
.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37,99,235,0.1);
  outline: none;
}
.form-label {
  font-size: 12px; font-weight: 700; color: var(--dark);
  text-transform: uppercase; letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.form-text { font-size: 11px; color: var(--gray-2); }

/* ---- PAGE HEADER ---- */
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}
.page-header-title { font-size: 22px; font-weight: 800; color: var(--dark); }
.page-header-sub { font-size: 13px; color: var(--gray); }

/* ---- INVOICE ITEMS TABLE ---- */
.items-table { width: 100%; border-collapse: collapse; }
.items-table th {
  background: var(--light); padding: 10px 12px;
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; color: var(--gray);
  border-bottom: 2px solid var(--border);
}
.items-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.items-table tbody tr:last-child td { border-bottom: none; }

/* ---- EMPTY STATE ---- */
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--gray);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; opacity: 0.4; }
.empty-state h3 { font-size: 18px; font-weight: 700; color: var(--dark-2); margin-bottom: 8px; }
.empty-state p { font-size: 14px; max-width: 360px; margin: 0 auto 20px; }

/* ---- SEARCH ---- */
.search-bar {
  display: flex; align-items: center; gap: 0;
  background: var(--white); border: 2px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: var(--transition);
}
.search-bar:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,0.1); }
.search-bar .search-icon { padding: 0 12px; color: var(--gray-2); font-size: 16px; }
.search-bar input { border: none; outline: none; flex: 1; padding: 9px 0; font-family: inherit; font-size: 13.5px; background: transparent; color: var(--dark); }

/* ---- NOTIFICATIONS ---- */
.toast-container { position: fixed; top: 80px; right: 20px; z-index: 9999; }
.app-toast {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 500; min-width: 280px; max-width: 380px;
  animation: toastIn 0.3s ease;
}
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
.app-toast.success { border-left: 4px solid var(--success); }
.app-toast.error { border-left: 4px solid var(--danger); }
.app-toast.warning { border-left: 4px solid var(--warning); }

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
  .sidebar-toggle { display: flex; }
  .page-content { padding: 16px; }
  .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .stat-card .stat-value { font-size: 20px; }
}
@media (max-width: 576px) {
  .topnav { padding: 0 16px; }
  .data-table th, .data-table td { padding: 10px 12px; }
}

/* ---- UTILITY ---- */
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }
.text-muted { color: var(--gray) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-primary { color: var(--primary) !important; }
.bg-primary-light { background: var(--primary-light); }
.divider { height: 1px; background: var(--border); margin: 16px 0; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---- INVOICE PREVIEW STYLES ---- */
.invoice-preview {
  background: white;
  max-width: 794px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  border-radius: 8px;
  overflow: hidden;
}
.inv-header { background: linear-gradient(135deg, #1e40af, #2563EB); color: white; padding: 32px 40px; }
.inv-logo { max-height: 60px; max-width: 180px; object-fit: contain; }
.inv-company-name { font-size: 22px; font-weight: 800; margin-bottom: 4px; }
.inv-title { font-size: 28px; font-weight: 800; letter-spacing: 2px; opacity: 0.9; }
.inv-body { padding: 32px 40px; }
.inv-section-label { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: #64748B; margin-bottom: 4px; }
.inv-client-name { font-size: 16px; font-weight: 700; color: #0F172A; }
.inv-table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.inv-table th { background: #1e40af; color: white; padding: 10px 14px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; font-weight: 700; }
.inv-table td { padding: 10px 14px; border-bottom: 1px solid #E2E8F0; font-size: 13px; }
.inv-table tbody tr:nth-child(even) td { background: #F8FAFC; }
.inv-totals { margin-left: auto; max-width: 300px; }
.inv-totals table { width: 100%; }
.inv-totals td { padding: 5px 10px; font-size: 13px; }
.inv-totals .grand-total td { background: #1e40af; color: white; font-weight: 800; font-size: 15px; border-radius: 6px; }
.inv-footer { background: #F8FAFC; border-top: 2px solid #E2E8F0; padding: 24px 40px; }
.inv-qr { text-align: center; }
.inv-qr img { width: 100px; height: 100px; border: 2px solid #E2E8F0; border-radius: 8px; padding: 4px; }
.inv-words { background: #EFF6FF; border-left: 4px solid #2563EB; padding: 10px 16px; border-radius: 0 8px 8px 0; font-size: 12px; font-weight: 600; color: #1e40af; margin-bottom: 16px; }

/* ---- DARK MODE OVERRIDES ---- */
[data-theme="dark"] .topnav { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .card { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .card-header { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .stat-card { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .data-table th { background: #0F172A; }
[data-theme="dark"] .data-table tbody tr:hover td { background: #0F172A; }
[data-theme="dark"] .form-control, [data-theme="dark"] .form-select { background: #0F172A; border-color: #334155; color: #F1F5F9; }
[data-theme="dark"] .search-bar { background: #0F172A; border-color: #334155; }
[data-theme="dark"] .search-bar input { color: #F1F5F9; }
[data-theme="dark"] body { background: #0F172A; }
[data-theme="dark"] .user-avatar { border-color: #334155; color: #F1F5F9; }
[data-theme="dark"] .icon-btn { border-color: #334155; color: #94A3B8; }
[data-theme="dark"] .dropdown-menu { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .dropdown-item { color: #CBD5E1; }
[data-theme="dark"] .dropdown-item:hover { background: #0F172A; color: #F1F5F9; }
[data-theme="dark"] .app-toast { background: #1E293B; border-color: #334155; color: #F1F5F9; }