/* ============================================
   GLOBAL STYLES & CSS VARIABLES
   ============================================ */

:root {
  /* Primary Colors */
  --primary-red: #d32f2f;
  --primary-dark: #c62828;
  --primary-light: #ef5350;
  
  /* Neutrals */
  --white: #ffffff;
  --light-gray: #f5f5f5;
  --gray: #e0e0e0;
  --dark-gray: #9e9e9e;
  --text-dark: #212121;
  --text-light: #757575;
  
  /* Accents */
  --success: #4caf50;
  --warning: #ff9800;
  --error: #d32f2f;
  --info: #2196f3;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & TYPOGRAPHY
   ============================================ */

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

html, body {
  width: 100%;
  height: 100%;
  background: var(--white);
  color: var(--text-dark);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 32px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
}

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

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

/* ============================================
   LAYOUT & CONTAINERS
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   BUTTONS & FORMS
   ============================================ */

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  outline: none;
}

.btn-primary {
  background: var(--primary-red);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--light-gray);
  color: var(--text-dark);
}

.btn-secondary:hover {
  background: var(--gray);
}

.btn-success {
  background: var(--success);
  color: var(--white);
}

.btn-success:hover {
  background: #45a049;
}

.btn-danger {
  background: var(--error);
  color: var(--white);
}

.btn-danger:hover {
  background: #b71c1c;
}

.btn-small {
  padding: 8px 16px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--gray);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--white);
  color: var(--text-dark);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-red);
  box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.1);
}

input[type="file"] {
  padding: var(--spacing-md);
  border: 2px dashed var(--gray);
  border-radius: var(--radius-md);
  cursor: pointer;
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-dark);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   NAVIGATION & HEADER
   ============================================ */

header {
  background: var(--white);
  border-bottom: 1px solid var(--gray);
  padding: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-red);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  color: var(--text-dark);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--light-gray);
  color: var(--primary-red);
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
  }
}

/* ============================================
   DASHBOARD CARDS
   ============================================ */

.metric-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: var(--transition);
}

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

.metric-card.income {
  border-left: 4px solid var(--success);
}

.metric-card.expense {
  border-left: 4px solid var(--primary-red);
}

.metric-card.profit {
  border-left: 4px solid var(--info);
}

.metric-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.5px;
}

.metric-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--spacing-sm);
}

.metric-change {
  font-size: 12px;
  font-weight: 600;
  color: var(--success);
}

.metric-change.negative {
  color: var(--error);
}

/* ============================================
   TABLE STYLES
   ============================================ */

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-lg);
}

thead {
  background: var(--light-gray);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-dark);
  letter-spacing: 0.5px;
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray);
}

tbody tr:hover {
  background: var(--light-gray);
}

/* ============================================
   BADGES & TAGS
   ============================================ */

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-income {
  background: #e8f5e9;
  color: #2e7d32;
}

.badge-expense {
  background: #ffebee;
  color: #c62828;
}

.badge-pending {
  background: #fff3e0;
  color: #e65100;
}

.badge-approved {
  background: #e3f2fd;
  color: #1565c0;
}

.badge-paid {
  background: #e8f5e9;
  color: #2e7d32;
}

/* ============================================
   SPINNER & LOADING
   ============================================ */

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--light-gray);
  border-top: 4px solid var(--primary-red);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  gap: var(--spacing-md);
  min-height: 200px;
}

.spinner-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

/* ============================================
   MODALS
   ============================================ */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  animation: fadeIn 0.3s ease-out;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-lg);
  max-width: 500px;
  max-height: 90vh;
  padding: var(--spacing-lg);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease-out;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--dark-gray);
}

.modal-close:hover {
  color: var(--text-dark);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 16px 24px;
  border-radius: 8px;
  color: var(--white);
  font-weight: 500;
  z-index: 10000;
  box-shadow: var(--shadow-lg);
}

.toast-success {
  background: var(--success);
}

.toast-error {
  background: var(--error);
}

.toast-info {
  background: var(--info);
}

.toast-warning {
  background: var(--warning);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-red); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.text-muted { color: var(--dark-gray); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.hidden { display: none !important; }
.visible { display: block !important; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  .grid-2, .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
  
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  h1 { font-size: 20px; }
  h2 { font-size: 18px; }
  h3 { font-size: 16px; }
  
  .btn {
    width: 100%;
    padding: 12px 16px;
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .grid {
    gap: var(--spacing-md);
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    max-width: 95vw;
    max-height: 95vh;
  }
  
  .nav-links {
    flex-direction: column;
  }
  
  table {
    font-size: 12px;
  }
  
  th, td {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .btn {
    padding: 10px 12px;
    font-size: 12px;
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    max-width: 100vw;
    max-height: 100vh;
    border-radius: 0;
  }
  
  .metric-value {
    font-size: 24px;
  }
}