/* ============================================
   ACCOUNTING & BILLING SYSTEM – DESIGN SYSTEM
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-rgb: 79, 70, 229;
  --accent: #06b6d4;
  --accent-light: #67e8f9;
  --success: #10b981;
  --success-light: #d1fae5;
  --success-dark: #059669;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --warning-dark: #d97706;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --danger-dark: #dc2626;
  --info: #3b82f6;
  --info-light: #dbeafe;
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-sidebar-hover: #f1f5f9;
  --bg-sidebar-active: #eef2ff;
  --bg-input: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --text-inverse: #fff;
  --text-sidebar: #475569;
  --text-sidebar-active: #4f46e5;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --border-input: #cbd5e1;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -1px rgba(0, 0, 0, .04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -2px rgba(0, 0, 0, .03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);
  --sidebar-width: 260px;
  --navbar-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --transition-fast: .15s ease;
  --transition-normal: .25s ease;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #1e293b;
  --bg-card: #1e293b;
  --bg-sidebar: #0f172a;
  --bg-sidebar-hover: #1e293b;
  --bg-sidebar-active: #1e293b;
  --bg-input: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-sidebar: #94a3b8;
  --text-sidebar-active: #818cf8;
  --border-color: #334155;
  --border-light: #1e293b;
  --border-input: #475569;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, .3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, .3);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, .4);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast)
}

a:hover {
  color: var(--primary-dark)
}

button {
  cursor: pointer;
  font-family: inherit
}

input,
select,
textarea {
  font-family: inherit
}

.app-layout {
  display: flex;
  min-height: 100vh
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-normal)
}

.page-content {
  flex: 1;
  padding: 24px;
  margin-top: var(--navbar-height)
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  overflow: hidden
}

.sidebar-brand {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
  min-height: 72px;
  flex-shrink: 0
}

.sidebar-brand .brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  flex-shrink: 0
}

.sidebar-brand .brand-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap
}

.sidebar-brand .brand-sub {
  font-size: 11px;
  color: var(--text-sidebar);
  opacity: .7
}

.sidebar-nav {
  flex: 1;
  padding: 12px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent
}
.sidebar-nav::-webkit-scrollbar {
  width: 6px
}
.sidebar-nav::-webkit-scrollbar-track {
  background: transparent
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px
}
.sidebar-nav::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary)
}

.nav-section {
  margin-bottom: 8px
}

.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-tertiary);
  padding: 12px 12px 6px
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--text-sidebar);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  margin-bottom: 2px
}

.nav-item:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-primary)
}

.nav-item.active {
  background: var(--bg-sidebar-active);
  color: var(--text-sidebar-active);
  font-weight: 600
}

.nav-item .nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
  flex-shrink: 0
}

.nav-item .nav-badge {
  margin-left: auto;
  background: var(--danger);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full)
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color)
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: var(--radius-md)
}

.sidebar-user .user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0
}

.sidebar-user .user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary)
}

.sidebar-user .user-role {
  font-size: 11px;
  color: var(--text-sidebar);
  opacity: .7
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: var(--navbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 900;
  transition: left var(--transition-normal)
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 16px
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  padding: 4px
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary)
}

.navbar-search {
  position: relative;
  width: 300px
}

.navbar-search input {
  width: 100%;
  padding: 8px 16px 8px 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all var(--transition-fast)
}

.navbar-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .1)
}

.navbar-search .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 16px
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 8px
}

.nav-btn {
  position: relative;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast)
}

.nav-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary)
}

.nav-btn .badge-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid var(--bg-secondary)
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast)
}

.user-menu:hover {
  border-color: var(--primary-200)
}

.user-menu .avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 13px
}

.user-menu .user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary)
}

/* Dropdown */
.dropdown {
  position: relative
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: 1100;
  overflow: hidden
}

.dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0)
}

.dropdown-menu .dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: background var(--transition-fast)
}

.dropdown-menu .dropdown-item:hover {
  background: var(--bg-tertiary)
}

.dropdown-menu .dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: 4px 0
}

.dropdown-menu .dropdown-item.text-danger {
  color: var(--danger)
}

/* ── Mobile Responsive ── */
@media (max-width: 768px) {

  /* Sidebar hidden by default, shown via toggle */
  .sidebar {
    transform: translateX(-100%);
    z-index: 1001;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, .5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
  }

  /* Main content full width */
  .main-content {
    margin-left: 0 !important;
  }

  /* Navbar full width */
  .navbar {
    left: 0 !important;
    padding: 0 12px !important;
    height: 56px !important;
    gap: 8px !important;
  }

  /* Show hamburger menu */
  .menu-toggle {
    display: flex !important;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 36px;
    height: 36px;
  }

  /* Truncate page title */
  .navbar-left {
    flex: 1;
    min-width: 0;
    gap: 8px !important;
  }

  .page-title {
    font-size: 15px !important;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
  }

  .page-subtitle {
    font-size: 11px !important;
    opacity: 0.7;
  }

  /* Hide search bar on mobile */
  .navbar-search {
    display: none !important;
  }

  /* Compact right side */
  .navbar-right {
    gap: 4px !important;
    flex-shrink: 0;
  }

  .nav-btn {
    font-size: 18px !important;
    padding: 6px !important;
  }

  .user-menu .user-name {
    display: none !important;
  }

  .user-menu {
    padding: 2px !important;
    border: none !important;
    background: none !important;
  }

  .user-menu .avatar {
    width: 30px !important;
    height: 30px !important;
    font-size: 12px !important;
  }

  /* Fix page content top margin */
  .page-content {
    margin-top: 56px !important;
    padding: 12px !important;
  }
}

/* ── Ultra Premium Sidebar Extensions ── */
.nav-group {
    margin-bottom: 2px;
}
.nav-group-toggle .arrow {
    margin-left: auto;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 16px;
    opacity: 0.6;
}
.nav-group.open .nav-group-toggle .arrow {
    transform: rotate(180deg);
    opacity: 1;
}
.nav-submenu {
    display: none;
    padding-left: 32px;
}
.nav-group.open > .nav-submenu {
    display: block !important;
}
.nav-submenu .nav-item {
    font-size: 13px;
    padding: 8px 12px;
    margin-bottom: 2px;
    color: var(--text-secondary);
}
.nav-submenu .nav-item::before {
    content: "•";
    margin-right: 8px;
    color: var(--text-tertiary);
}
.nav-submenu .nav-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}
.nav-submenu .nav-item.active {
    background: var(--bg-sidebar-active);
    color: var(--primary);
    font-weight: 600;
    border-left: 2px solid var(--primary);
}
.nav-submenu .nav-item.active::before {
    color: var(--primary);
}

/* Standard White Sidebar */
.sidebar {
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.04);
}
.sidebar-user.glass-panel {
    background: var(--bg-tertiary);
    backdrop-filter: none;
    border: 1px solid var(--border-color);
    box-shadow: none;
}
.sidebar-brand .brand-icon {
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}
/* Dark mode sidebar override */
[data-theme="dark"] .sidebar {
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.3);
}
[data-theme="dark"] .sidebar-brand .brand-text {
    color: #f1f5f9;
}
[data-theme="dark"] .sidebar-user .user-name {
    color: #f1f5f9;
}