/**
 * MJ SMART BILLING - Core Design System & Global Styles
 * Brand: MJ SMART APPS
 * Aesthetics: Premium, Modern, Clean, Professional Indian SaaS
 */

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

:root {
  /* Brand Colors */
  --brand-primary: #4F46E5;
  --brand-primary-hover: #4338CA;
  --brand-primary-light: #EEF2FF;
  --brand-primary-dark: #3730A3;
  --brand-accent: #06B6D4;
  --brand-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
  --brand-gradient-hover: linear-gradient(135deg, #4338CA 0%, #0891B2 100%);

  /* WhatsApp Brand Colors */
  --whatsapp-green: #25D366;
  --whatsapp-green-hover: #20BA5C;
  --whatsapp-green-bg: #E8F9EE;
  --whatsapp-dark: #075E54;

  /* Neutral Slate Palette (Light Theme Default) */
  --bg-app: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-muted: #F1F5F9;
  --bg-subtle: #F8FAFC;
  --bg-hover: #F1F5F9;

  --border-subtle: #E2E8F0;
  --border-medium: #CBD5E1;
  --border-focus: #818CF8;

  --text-main: #0F172A;
  --text-muted: #64748B;
  --text-subtle: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Semantic Feedback */
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-success-border: #A7F3D0;
  
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-warning-border: #FDE68A;

  --color-danger: #EF4444;
  --color-danger-bg: #FEF2F2;
  --color-danger-border: #FECACA;

  --color-info: #3B82F6;
  --color-info-bg: #EFF6FF;
  --color-info-border: #BFDBFE;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', -apple-system, sans-serif;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.08), 0 1px 2px -1px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 9999px;

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 68px;
  --transition-speed: 0.2s;
}

/* Dark Theme Support */
[data-theme="dark"] {
  --bg-app: #0F172A;
  --bg-surface: #1E293B;
  --bg-surface-elevated: #334155;
  --bg-muted: #1E293B;
  --bg-subtle: #0F172A;
  --bg-hover: #334155;

  --border-subtle: #334155;
  --border-medium: #475569;
  --border-focus: #818CF8;

  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-subtle: #64748B;
  --text-inverse: #0F172A;

  --brand-primary-light: rgba(79, 70, 229, 0.15);
  --whatsapp-green-bg: rgba(37, 211, 102, 0.15);
  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-info-bg: rgba(59, 130, 246, 0.15);

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

p {
  color: var(--text-muted);
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--brand-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover:not(:disabled) {
  background: var(--brand-primary-hover);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.btn-gradient {
  background: var(--brand-gradient);
  color: #FFFFFF;
  box-shadow: 0 3px 8px rgba(79, 70, 229, 0.25);
}

.btn-gradient:hover:not(:disabled) {
  background: var(--brand-gradient-hover);
  box-shadow: 0 5px 14px rgba(79, 70, 229, 0.35);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--border-medium);
}

.btn-outline {
  background: transparent;
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.btn-outline:hover:not(:disabled) {
  background: var(--brand-primary-light);
}

.btn-whatsapp {
  background: var(--whatsapp-green);
  color: #FFFFFF;
  box-shadow: 0 2px 6px rgba(37, 211, 102, 0.25);
}

.btn-whatsapp:hover:not(:disabled) {
  background: var(--whatsapp-green-hover);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.35);
}

.btn-danger {
  background: var(--color-danger);
  color: #FFFFFF;
}

.btn-danger:hover:not(:disabled) {
  background: #DC2626;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.84rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 12px 24px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success-border);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid var(--color-warning-border);
}

.badge-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid var(--color-danger-border);
}

.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid var(--color-info-border);
}

.badge-whatsapp {
  background: var(--whatsapp-green-bg);
  color: #059669;
  border: 1px solid rgba(37, 211, 102, 0.3);
}

.badge-neutral {
  background: var(--bg-muted);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-label .required {
  color: var(--color-danger);
}

.form-control, .form-select {
  width: 100%;
  padding: 9px 13px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.92rem;
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
  outline: none;
}

.form-control:focus, .form-select:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.form-control::placeholder {
  color: var(--text-subtle);
}

.input-with-icon {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-icon .input-icon {
  position: absolute;
  left: 12px;
  color: var(--text-subtle);
  pointer-events: none;
}

.input-with-icon .form-control {
  padding-left: 38px;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-subtle);
}

/* Cards & Containers */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  transition: box-shadow var(--transition-speed);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
}

/* Modal Dialogs */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

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

.modal-content {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.96);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-subtle);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 320px;
  max-width: 440px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--brand-primary);
  border-top: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: slideInRight 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: all 0.2s ease;
}

.toast.toast-success { border-left-color: var(--color-success); }
.toast.toast-error { border-left-color: var(--color-danger); }
.toast.toast-warning { border-left-color: var(--color-warning); }
.toast.toast-info { border-left-color: var(--color-info); }
.toast.toast-whatsapp { border-left-color: var(--whatsapp-green); }

.toast-icon {
  font-size: 1.2rem;
  line-height: 1;
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-main);
  margin-bottom: 2px;
}

.toast-message {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-subtle);
  cursor: pointer;
  padding: 2px;
}

.toast-close:hover {
  color: var(--text-main);
}

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

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th {
  padding: 12px 16px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.table td {
  padding: 14px 16px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-main);
}

.table tbody tr {
  transition: background-color var(--transition-speed);
}

.table tbody tr:hover {
  background-color: var(--bg-hover);
}

/* Empty State Component */
.empty-state {
  text-align: center;
  padding: 48px 24px;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  color: var(--text-subtle);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.empty-state-desc {
  font-size: 0.9rem;
  max-width: 400px;
  margin: 0 auto 20px;
}

/* Utility Classes */
.text-right { text-align: right; }
.text-center { text-align: center; }
.font-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }
.font-bold { font-weight: 700; }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-primary { color: var(--brand-primary); }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap-2 { display: flex; gap: 8px; }
.flex-gap-3 { display: flex; gap: 12px; }
.w-full { width: 100%; }