:root {
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --bg: #ffffff;
  --bg2: #f8f9fb;
  --bg3: #f1f5f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --accent: #2EC8C8;
  --accent-dark: #1a9fa0;
  --accent-dim: rgba(46, 200, 200, 0.10);
  --text: #0a0f1e;
  --text-2: #374151;
  --muted: #6b7280;
  --success: #10b981;
  --success-dim: rgba(16, 185, 129, 0.10);
  --danger: #ef4444;
  --danger-dim: rgba(239, 68, 68, 0.10);
  --warning: #f59e0b;
  --warning-dim: rgba(245, 158, 11, 0.10);
  --sidebar-bg: #0a1628;
  --sidebar-text: #6b849e;
  --sidebar-active-bg: rgba(46, 200, 200, 0.12);
  --sidebar-active-text: #2EC8C8;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
  --transition: 0.14s ease;
  --max-width: 1200px;
}

html[data-theme='light'] {
  --bg: #ffffff;
  --bg2: #f8f9fb;
  --bg3: #f1f5f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #0a0f1e;
  --text-2: #374151;
  --muted: #6b7280;
  --sidebar-bg: #0a1628;
  --sidebar-text: #6b849e;
  --sidebar-active-bg: rgba(46, 200, 200, 0.12);
  --sidebar-active-text: #2EC8C8;
  /* Aliases for dashboard.html inline styles */
  --bg-secondary: #f3f5f7;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
}

html[data-theme='dark'] {
  --bg: #05050a;
  --bg2: #0d0d18;
  --bg3: #131325;
  --card: #0f0f1e;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f0f4f8;
  --text-2: #cbd5e1;
  --muted: #64748b;
  --sidebar-bg: #070711;
  --sidebar-text: rgba(107, 132, 158, 0.6);
  --sidebar-active-bg: rgba(46, 200, 200, 0.12);
  --sidebar-active-text: #2EC8C8;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  /* Aliases for dashboard.html inline styles */
  --bg-secondary: #0f0f1e;
  --card-bg: #1f1f3f;
  --border-color: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f4f8;
  --text-secondary: #cbd5e1;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg2);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

.invoice-link {
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  transition: var(--transition);
}
.invoice-link:hover {
  color: var(--accent-dark);
  opacity: 0.85;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  margin: 0;
  color: var(--text);
}
h1 { font-size: 2rem; font-weight: 700; line-height: 1.25; }
h2 { font-size: 1.5rem; font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.35; }
p { margin: 0; }

img, svg { max-width: 100%; }

.container {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin: 0 16px 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius);
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: var(--transition);
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #041019;
}
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); text-decoration: none; }
.btn-outline { background: transparent; border-color: var(--accent); color: var(--accent-dark); }
.btn-outline:hover { background: var(--accent-dim); text-decoration: none; }
.btn-secondary { background: var(--bg2); border-color: var(--border); color: var(--text-2); }
.btn-secondary:hover { background: var(--bg3); text-decoration: none; }
.btn-danger { background: transparent; border-color: rgba(239, 68, 68, 0.3); color: var(--danger); }
.btn-danger:hover { background: var(--danger-dim); text-decoration: none; }
.btn-block { width: 100%; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge-draft { background: #f1f5f9; color: #64748b; }
.badge-sent { background: var(--accent-dim); color: var(--accent-dark); }
.badge-paid { background: var(--success-dim); color: var(--success); }
.badge-overdue { background: var(--danger-dim); color: var(--danger); }
.badge-viewed { background: var(--warning-dim); color: var(--warning); }

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  font-family: var(--font-body);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 6px;
}
.form-group { margin-bottom: 16px; }
.form-row { display: grid; gap: 16px; }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 680px; }
th {
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
}
tr:hover td { background: var(--bg2); }
tr:last-child td { border-bottom: none; }

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--muted);
}
.empty-state svg { margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 14px; margin: 0 0 16px; }

.app-layout,
.app-shell { 
  display: flex; 
  min-height: 100vh; 
  background: var(--bg);
}
.sidebar {
  width: 118px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  padding: max(12px, env(safe-area-inset-top)) 12px 12px;
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  z-index: 120;
}
.main-area { 
  flex: 1; 
  min-width: 0; 
  display: flex; 
  flex-direction: column;
  overflow-y: auto;
}
.topbar {
  height: 58px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: max(0px, env(safe-area-inset-top)) 16px 0;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 110;
  padding-right: 16px;
}
.topbar-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.page-content { flex: 1; padding: 24px 16px max(24px, env(safe-area-inset-bottom)); }

.logo {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  text-align: center;
}

.logo .accent {
  color: var(--accent);
}

.logo-mark {
  display: none;
}

.sidebar-nav { margin-top: 20px; display: flex; flex-direction: column; gap: 4px; }
.sidebar-link {
  color: var(--sidebar-text);
  border-radius: var(--radius);
  padding: 11px 10px;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
}
.sidebar-link:hover { background: rgba(255,255,255,0.06); text-decoration: none; }
.sidebar-link.active { background: var(--sidebar-active-bg); color: var(--sidebar-active-text); }
.sidebar-link svg { width: 18px; height: 18px; flex-shrink: 0; }

/* Sidebar dropdown and submenu */
.sidebar-dropdown { position: relative; }
.sidebar-submenu {
  display: none;
  list-style: none;
  padding: 8px 0;
  margin: 4px 0 0 0;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.sidebar-submenu.open { display: block; }

.dropdown-arrow {
  display: inline-block;
  transition: transform 0.2s;
  font-size: 14px;
}
.sidebar-dropdown-toggle.expanded .dropdown-arrow {
  transform: rotate(90deg);
}

.sidebar-submenu-group { border-bottom: 1px solid rgba(255,255,255,0.05); }
.sidebar-submenu-group:last-child { border-bottom: none; }

.sidebar-submenu-group-title {
  padding: 11px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--sidebar-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.sidebar-submenu-group-title:hover { background: rgba(255,255,255,0.06); }

.group-arrow { font-size: 14px; transition: transform 0.2s; }
.sidebar-submenu-group-title.expanded .group-arrow { transform: rotate(90deg); }

.sidebar-submenu-group-items {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
  background: rgba(0,0,0,0.2);
}
.sidebar-submenu-group-items.open { display: block; }

.sidebar-submenu-group-items li {
  padding: 0;
  margin: 0;
}
.sidebar-submenu-group-items .sidebar-link {
  padding: 8px 20px;
  font-size: 11px;
  min-height: auto;
}

.sidebar-footer { margin-top: auto; padding-top: 10px; }

.mobile-menu-btn,
.theme-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-2);
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.mobile-menu-btn { display: none; }

.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 119;
}
.overlay.visible { display: block; }

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 24px 16px 0;
}
.page-subtitle { color: var(--muted); font-size: 14px; margin-top: 4px; }

.kpi-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.kpi-card { position: relative; border-top: 3px solid var(--accent); }
.kpi-label { font: 600 11px/1.3 var(--font-heading); color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.kpi-value { margin-top: 8px; font: 700 1.75rem/1.2 var(--font-heading); color: var(--text); }
.kpi-sub { margin-top: 4px; font-size: 14px; color: var(--muted); }
.kpi-icon { position: absolute; right: 20px; top: 16px; width: 18px; height: 18px; }

.grid-2 { display: grid; grid-template-columns: 1fr 320px; gap: 16px; }
.stack { display: grid; gap: 16px; }

.inline-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.status-text { color: var(--muted); font-size: 14px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.notice {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 12px;
  font-size: 14px;
  color: var(--text-2);
  background: var(--bg2);
}

.skeleton {
  background: linear-gradient(90deg, var(--bg2) 25%, var(--bg3) 50%, var(--bg2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: 6px;
}
.fade-in { animation: fadeIn 0.22s ease; }
.hidden { display: none !important; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (hover: hover) and (pointer: fine) {
  .card-hover:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
}

@media (max-width: 1024px) {
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
  h1 { font-size: 1.65rem; }
  .container { padding: 0 16px; }
  .mobile-menu-btn { display: inline-flex; }
  .sidebar {
    position: fixed;
    left: -168px;
    top: 0;
    bottom: 0;
    transition: left 0.25s ease;
  }
  .sidebar.open { left: 0; }
  .page-content { padding: 16px; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 479px) {
  .kpi-grid { grid-template-columns: 1fr; }
}

@media (min-width: 768px) {
  .container { padding: 0 24px; }
  .topbar { padding-left: 24px; padding-right: 24px; }
  .page-content { padding: 24px; }
  h1 { font-size: 2rem; }
}