/* Modern Premium Style with Enhanced Design */

/* Theme Variables - Enhanced Color Palette */
:root {
  /* Light Theme - Modern Glass Design */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --accent-tertiary: #a5b4fc;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --border-color: #e2e8f0;
  --border-light: rgba(148, 163, 184, 0.1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-color: rgba(0, 0, 0, 0.08);
  --glass-blur: blur(10px);
  --card-bg: rgba(255, 255, 255, 0.8);
  --header-bg: #0f172a;
  --header-text: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --nav-text: #0f172a;
  --nav-active: #6366f1;
  --nav-hover-bg: #f1f5f9;
  --table-header-bg: #0f172a;
  --table-header-text: #ffffff;
  --table-row-even: #f8fafc;
  --table-row-odd: #ffffff;
  --table-hover: rgba(99, 102, 241, 0.05);
  --table-border: #e2e8f0;
  --input-bg: #ffffff;
  --input-text: #0f172a;
  --input-border: #e2e8f0;
  --input-focus-border: #6366f1;
  --input-focus-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  --btn-primary-bg: #6366f1;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #4f46e5;
  --btn-secondary-bg: #f1f5f9;
  --btn-secondary-text: #475569;
  --btn-secondary-hover: #e2e8f0;
  --btn-success-bg: #10b981;
  --btn-success-hover: #059669;
  --btn-danger-bg: #ef4444;
  --btn-danger-hover: #dc2626;
  --btn-warning-bg: #f59e0b;
  --btn-warning-hover: #d97706;
  --btn-info-bg: #0ea5e9;
  --btn-info-hover: #0284c7;
  --status-paid: #10b981;
  --status-unpaid: #6366f1;
  --status-overdue: #ef4444;
  --status-draft: #94a3b8;
  --status-sent: #f59e0b;
  --status-cancelled: #64748b;
  --footer-bg: #0f172a;
  --footer-text: #e2e8f0;
  --footer-link: #94a3b8;
  --footer-link-hover: #ffffff;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Monaco', 'Courier New', monospace;
  --font-size-base: 16px;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index */
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal: 40;
  --z-popover: 50;
  --z-tooltip: 60;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Fancy background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(165, 180, 252, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Improved Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

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

a:hover {
  color: var(--accent-secondary);
}

/* Main Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Enhanced Header with Glassmorphism */
.premium-header {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--header-text);
  padding: var(--spacing-md) 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-normal);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  position: relative;
}

/* Enhanced Logo */
.logo-container {
  flex: 1;
  text-align: center;
}

.logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
  transition: transform var(--transition-normal);
}

.logo:hover {
  transform: scale(1.05);
}

/* Mobile Menu Toggle - Enhanced */
.mobile-menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  padding: var(--spacing-sm);
  z-index: var(--z-sticky);
  outline: none;
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-normal);
}

.mobile-menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.burger-icon {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 20px;
  height: 14px;
  position: relative;
  margin: 0 auto;
}

.burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--header-text);
  border-radius: var(--border-radius-full);
  transition: all 0.3s cubic-bezier(0.68, -0.6, 0.32, 1.6);
}

/* Header Actions - Enhanced */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-info {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-full);
  padding: var(--spacing-xs) var(--spacing-md);
  transition: all var(--transition-fast);
}

.user-info:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: var(--spacing-sm);
  font-weight: var(--font-weight-bold);
  color: white;
  font-size: var(--font-size-sm);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.user-email {
  margin-right: var(--spacing-md);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.logout-btn {
  background: rgba(239, 68, 68, 0.1);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-full);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.logout-btn:hover {
  background-color: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.3);
  transform: translateY(-1px);
  color: white;
}

/* Enhanced Theme Toggle */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
}

.theme-switch {
  position: relative;
  display: inline-block;
  width: 56px;
  height: 28px;
  margin-right: var(--spacing-sm);
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition-normal);
  border-radius: var(--border-radius-full);
  overflow: hidden;
}

.slider:before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background: white;
  transition: var(--transition-normal);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.slider:after {
  content: "☀️";
  position: absolute;
  top: 5px;
  left: 6px;
  font-size: 14px;
  opacity: 1;
  transition: var(--transition-normal);
}

input:checked + .slider {
  background: var(--accent-gradient);
  border-color: transparent;
}

input:checked + .slider:before {
  transform: translateX(28px);
}

input:checked + .slider:after {
  content: "🌙";
  left: 34px;
}

.theme-label {
  color: var(--header-text);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  opacity: 0.9;
}

/* Enhanced Navigation with Glassmorphism */
.main-nav {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  position: sticky;
  top: 68px;
  z-index: calc(var(--z-sticky) - 1);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-light);
}

.nav-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 68px;
  justify-content: center;
  gap: var(--spacing-xs);
}

.nav-menu li {
  position: relative;
}

.nav-menu a {
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-lg);
  height: 100%;
  color: var(--nav-text);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  position: relative;
  letter-spacing: -0.2px;
  border-radius: var(--border-radius-lg);
}

.nav-menu a svg {
  margin-right: var(--spacing-sm);
  transition: transform var(--transition-fast);
  opacity: 0.8;
}

.nav-menu a span {
  position: relative;
}

/* Modern hover effect */
.nav-menu a:after {
  content: "";
  position: absolute;
  bottom: 12px;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--accent-gradient);
  transition: all var(--transition-normal);
  transform: translateX(-50%);
  opacity: 0;
  border-radius: var(--border-radius-full);
}

.nav-menu a:hover {
  color: var(--accent-primary);
  background-color: rgba(99, 102, 241, 0.05);
}

.nav-menu a:hover svg {
  transform: translateY(-2px);
  opacity: 1;
}

.nav-menu a:hover:after,
.nav-menu a.active:after {
  width: 60%;
  opacity: 1;
}

.nav-menu a.active {
  color: var(--accent-primary);
  font-weight: var(--font-weight-semibold);
  background-color: rgba(99, 102, 241, 0.08);
}

/* Enhanced Cards with Glassmorphism */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.3), transparent);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.9) 0%, rgba(139, 92, 246, 0.9) 100%);
  color: white;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  letter-spacing: -0.2px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(241, 245, 249, 0.5);
  border-top: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Enhanced Dashboard Stats */
.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
  transition: transform var(--transition-slow);
}

.stat-card:hover::before {
  transform: scale(1.1);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.2);
}

.stat-title {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

/* Enhanced Quick Actions */
.quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.action-button {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--accent-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.action-button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width var(--transition-normal), height var(--transition-normal);
}

.action-button:hover::before {
  width: 100%;
  height: 100%;
}

.action-button:hover {
  background-color: rgba(99, 102, 241, 0.05);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.action-button i {
  margin-right: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

/* Enhanced Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  letter-spacing: -0.1px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--input-border);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-md);
  background-color: var(--input-bg);
  color: var(--input-text);
  transition: all var(--transition-fast);
  font-family: var(--font-family);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="date"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent-primary);
  outline: none;
  box-shadow: var(--input-focus-shadow);
  background-color: white;
}

input[type="text"]:hover,
input[type="email"]:hover,
input[type="password"]:hover,
input[type="date"]:hover,
input[type="number"]:hover,
select:hover,
textarea:hover {
  border-color: var(--accent-tertiary);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

/* Form Control Variants */
.form-control-static {
  padding: var(--spacing-md);
  background-color: var(--bg-tertiary);
  border-radius: var(--border-radius-lg);
  border: 2px solid transparent;
}

/* Enhanced Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: none;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  text-align: center;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  letter-spacing: -0.1px;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  background-color: var(--btn-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(99, 102, 241, 0.3);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.btn-success:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.btn-danger:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-warning {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
}

.btn-warning:hover {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-info {
  background: linear-gradient(135deg, var(--btn-info-bg, #0ea5e9) 0%, var(--btn-info-hover, #0284c7) 100%);
  color: white;
}

.btn-info:hover {
  background: linear-gradient(135deg, var(--btn-info-hover, #0284c7) 0%, #0369a1 100%);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--accent-primary);
  color: var(--accent-primary);
}

.btn-outline:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* Enhanced Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-lg);
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--table-header-text);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
  z-index: 10;
}

table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--table-border);
  transition: background-color var(--transition-fast);
}

table tr {
  transition: all var(--transition-fast);
}

table tr:nth-child(even) {
  background-color: var(--table-row-even);
}

table tr:nth-child(odd) {
  background-color: var(--table-row-odd);
}

table tr:hover td {
  background-color: var(--table-hover);
}

/* Action Buttons in Tables */
.action-buttons {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

/* Enhanced Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.status-badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  border-radius: var(--border-radius-full) 0 0 var(--border-radius-full);
}

.status-paid {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--status-paid);
}

.status-paid::before {
  background-color: var(--status-paid);
}

.status-unpaid {
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--status-unpaid);
}

.status-unpaid::before {
  background-color: var(--status-unpaid);
}

.status-sent {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--status-sent);
}

.status-sent::before {
  background-color: var(--status-sent);
}

.status-overdue {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--status-overdue);
}

.status-overdue::before {
  background-color: var(--status-overdue);
}

.status-draft {
  background-color: rgba(148, 163, 184, 0.1);
  color: var(--status-draft);
}

.status-draft::before {
  background-color: var(--status-draft);
}

.status-cancelled {
  background-color: rgba(100, 116, 139, 0.1);
  color: var(--status-cancelled);
}

.status-cancelled::before {
  background-color: var(--status-cancelled);
}

/* Enhanced Alerts */
.alert {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  position: relative;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: #065f46;
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-left: 4px solid var(--status-paid);
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: #991b1b;
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-left: 4px solid var(--status-overdue);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-left: 4px solid var(--status-sent);
}

.alert-info {
  background-color: rgba(99, 102, 241, 0.1);
  color: #3730a3;
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-left: 4px solid var(--status-unpaid);
}

.close-alert {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  line-height: 1;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
  color: inherit;
}

.close-alert:hover {
  opacity: 1;
}

/* Enhanced Login Page */
.login-container {
  max-width: 480px;
  margin: 80px auto 40px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.login-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: var(--accent-gradient);
}

.login-container:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.login-logo {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xl);
  letter-spacing: -1px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.2));
}

.login-btn {
  width: 100%;
  padding: var(--spacing-md);
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-lg);
  background: var(--accent-gradient);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* Enhanced Charts */
.chart-container {
  position: relative;
  height: 320px;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--border-radius-lg);
}

.charts-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Enhanced Footer */
footer {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--footer-text);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.5), transparent);
}

.footer-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
}

.footer-column {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: white;
  position: relative;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent-gradient);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: var(--footer-link);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  padding-left: 0;
}

.footer-link:hover {
  color: var(--footer-link-hover);
  padding-left: var(--spacing-sm);
}

.footer-bottom {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--footer-link);
}

/* Floating Action Button - Enhanced */
.fab {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 64px;
  height: 64px;
  background: var(--accent-gradient);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
  cursor: pointer;
  z-index: 100;
  transition: all var(--transition-normal);
  font-size: var(--font-size-2xl);
}

.fab:hover {
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.fab-menu {
  position: absolute;
  bottom: 80px;
  right: 0;
  display: none;
  flex-direction: column;
  gap: var(--spacing-md);
}

.fab-menu.active {
  display: flex;
}

.fab-item {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--accent-primary);
  min-width: 160px;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  text-align: left;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  border: 1px solid var(--border-light);
}

.fab-item:hover {
  background-color: var(--accent-primary);
  color: white;
  transform: translateX(-5px);
}

/* Loading Animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.skeleton {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  background: linear-gradient(90deg, #f3f4f6 25%, #e5e7eb 50%, #f3f4f6 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: calc(var(--z-sticky) - 2);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Responsive Design */
@media (max-width: 768px) {
  /* Mobile menu toggle visible */
  .mobile-menu-toggle {
    display: flex !important;
  }
  
  /* Mobile navigation */
  .main-nav {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 85% !important;
    max-width: 320px !important;
    height: 100vh !important;
    margin-bottom: 0 !important;
    transform: translateX(-100%) !important;
    z-index: var(--z-fixed) !important;
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1) !important;
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    overflow-y: auto !important;
    box-shadow: 5px 0 25px rgba(0, 0, 0, 0.15) !important;
    border-radius: 0 var(--border-radius-2xl) var(--border-radius-2xl) 0 !important;
  }
  
  .main-nav.active {
    transform: translateX(0) !important;
  }
  
  .nav-container {
    height: 100% !important;
    padding: var(--spacing-xl) var(--spacing-md) !important;
    overflow-y: auto !important;
  }
  
  .nav-container::before {
    content: "Navigation";
    display: block;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu {
    flex-direction: column !important;
    height: auto !important;
    gap: var(--spacing-sm) !important;
  }
  
  .nav-menu li {
    width: 100% !important;
  }
  
  .nav-menu a {
    padding: var(--spacing-md) var(--spacing-lg) !important;
    margin-bottom: var(--spacing-xs) !important;
    border-radius: var(--border-radius-lg) !important;
    height: auto !important;
    justify-content: flex-start !important;
  }
  
  .nav-menu a:hover {
    background-color: rgba(99, 102, 241, 0.1) !important;
    transform: translateX(5px) !important;
  }
  
  .nav-menu a.active {
    background: var(--accent-gradient) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3) !important;
  }
  
  .nav-menu a.active svg {
    color: white !important;
  }
  
  /* Header adjustments */
  .header-container {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .logo-container {
    text-align: left;
  }
  
  .logo {
    font-size: var(--font-size-xl);
  }
  
  .header-actions {
    gap: var(--spacing-sm);
  }
  
  .user-info {
    padding: var(--spacing-xs);
    background: none;
    border: none;
  }
  
  .user-avatar {
    display: none;
  }
  
  .user-email {
    display: none;
  }
  
  .logout-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    justify-content: center;
  }
  
  .logout-text {
    display: none;
  }
  
  .theme-label {
    display: none;
  }
  
  /* Container adjustments */
  .container {
    padding: var(--spacing-md);
  }
  
  /* Card adjustments */
  .card {
    margin-bottom: var(--spacing-md);
  }
  
  .card-body {
    padding: var(--spacing-md);
  }
  
  /* Stats container adjustments */
  .stats-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
  
  .stat-card {
    padding: var(--spacing-md);
  }
  
  .stat-value {
    font-size: var(--font-size-2xl);
  }
  
  /* Charts adjustments */
  .charts-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .chart-container {
    height: 250px;
  }
  
  /* Table adjustments */
  .table-container {
    border-radius: var(--border-radius-lg);
  }
  
  /* Quick actions adjustments */
  .quick-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .action-button {
    width: 100%;
    justify-content: center;
  }
  
  /* FAB adjustments */
  .fab {
    width: 56px;
    height: 56px;
    bottom: 20px;
    right: 20px;
  }
  
  /* Footer adjustments */
  .footer-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .footer-title::after {
    left: 50%;
    transform: translateX(-50%);
  }
  
  .footer-links {
    align-items: center;
  }
  
  .footer-link:hover {
    padding-left: 0;
  }
}

@media (max-width: 480px) {
  /* Extra small screen adjustments */
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  .stats-container {
    grid-template-columns: 1fr;
  }
  
  .login-container {
    margin: 40px auto;
    padding: var(--spacing-lg);
    width: 90%;
  }
}

/* Invoice Items Styling - Keep existing functionality */
.invoice-items {
  width: 100%;
}

.item-row {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr 2fr 1fr auto;
  gap: 10px;
  margin-bottom: 10px;
  align-items: center;
}

.date-row {
  display: flex;
  gap: 20px;
}

.date-row .form-group {
  flex: 1;
}

/* Mobile styles for invoice creation */
@media (max-width: 768px) {
  .date-row {
    flex-direction: column;
    gap: 10px;
  }
  
  .item-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
  }
  
  .item-row > div {
    width: 100%;
  }
  
  .item-row input {
    width: 100%;
    padding: 12px;
    font-size: 16px;
  }
  
  .item-row .item-date {
    min-width: auto;
  }
  
  .item-row > div::before {
    content: attr(data-label);
    display: block;
    font-weight: bold;
    margin-bottom: 4px;
    color: var(--text-secondary);
  }
  
  .item-row:first-child {
    display: none;
  }
  
  .delete-item {
    width: 100%;
    margin-top: 8px;
    padding: 10px;
  }
  
  #add-item {
    width: 100%;
    padding: 12px;
    margin: 15px 0;
  }
  
  .totals-section {
    margin-top: 20px;
  }
  
  .totals-row {
    justify-content: space-between;
  }
  
  .totals-label {
    text-align: left;
    margin-right: 0;
  }
  
  input[type="date"],
  input[type="text"],
  input[type="number"],
  select,
  textarea {
    font-size: 16px;
    padding: 12px;
    width: 100%;
  }
  
  .btn {
    padding: 12px 16px;
    min-height: 44px;
  }
  
  .mobile-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .mobile-buttons .btn {
    display: block;
    width: 100%;
    margin-bottom: 0;
  }
}

/* Keep invoice template styles unchanged */
.invoice-container {
  background-color: white !important;
  color: #3c3c3c !important;
}

.invoice-container * {
  color: inherit;
}

/* Invoice styling preserved as requested */