/**
 * Main CSS - Design System & Global Styles
 * Dental Clinic Management System
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
  /* Primary Colors - Teal/Medical Theme */
  --color-primary: hsl(174, 84%, 40%);
  --color-primary-hover: hsl(174, 84%, 35%);
  --color-primary-light: hsl(174, 84%, 90%);
  --color-primary-dark: hsl(174, 84%, 25%);

  /* Secondary Colors */
  --color-secondary: hsl(200, 80%, 50%);
  --color-secondary-light: hsl(200, 80%, 90%);

  /* Accent Colors */
  --color-accent: hsl(160, 70%, 60%);
  --color-accent-light: hsl(160, 70%, 95%);

  /* Semantic Colors */
  --color-success: hsl(142, 71%, 45%);
  --color-success-light: hsl(142, 71%, 95%);
  --color-warning: hsl(38, 92%, 50%);
  --color-warning-light: hsl(38, 92%, 95%);
  --color-danger: hsl(0, 84%, 60%);
  --color-danger-light: hsl(0, 84%, 95%);
  --color-info: hsl(199, 89%, 48%);
  --color-info-light: hsl(199, 89%, 95%);

  /* Neutral Colors - Light Mode */
  --color-white: hsl(0, 0%, 100%);
  --color-gray-50: hsl(210, 20%, 98%);
  --color-gray-100: hsl(210, 20%, 95%);
  --color-gray-200: hsl(210, 16%, 90%);
  --color-gray-300: hsl(210, 14%, 80%);
  --color-gray-400: hsl(210, 12%, 65%);
  --color-gray-500: hsl(210, 10%, 50%);
  --color-gray-600: hsl(210, 12%, 40%);
  --color-gray-700: hsl(210, 14%, 30%);
  --color-gray-800: hsl(210, 16%, 20%);
  --color-gray-900: hsl(210, 20%, 10%);
  --color-black: hsl(0, 0%, 0%);

  /* Surfaces */
  --color-background: var(--color-gray-50);
  --color-surface: var(--color-white);
  --color-surface-hover: var(--color-gray-100);
  --color-border: var(--color-gray-200);
  --color-text: var(--color-gray-900);
  --color-text-muted: var(--color-gray-600);
  --color-shadow: hsl(210, 20%, 10%, 0.1);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Monaco', 'Courier New', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  /* 12px */
  --text-sm: 0.875rem;
  /* 14px */
  --text-base: 1rem;
  /* 16px */
  --text-lg: 1.125rem;
  /* 18px */
  --text-xl: 1.25rem;
  /* 20px */
  --text-2xl: 1.5rem;
  /* 24px */
  --text-3xl: 1.875rem;
  /* 30px */
  --text-4xl: 2.25rem;
  /* 36px */

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Spacing Scale (4px base) */
  --space-1: 0.25rem;
  /* 4px */
  --space-2: 0.5rem;
  /* 8px */
  --space-3: 0.75rem;
  /* 12px */
  --space-4: 1rem;
  /* 16px */
  --space-5: 1.25rem;
  /* 20px */
  --space-6: 1.5rem;
  /* 24px */
  --space-8: 2rem;
  /* 32px */
  --space-10: 2.5rem;
  /* 40px */
  --space-12: 3rem;
  /* 48px */
  --space-16: 4rem;
  /* 64px */

  /* Border Radius */
  --radius-sm: 0.375rem;
  /* 6px */
  --radius-md: 0.5rem;
  /* 8px */
  --radius-lg: 0.75rem;
  /* 12px */
  --radius-xl: 1rem;
  /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px var(--color-shadow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-toast: 1060;
  --z-tooltip: 1070;

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 64px;
  --mobile-nav-height: 64px;
}

/* ============================================
   DARK MODE VARIABLES
   ============================================ */

[data-theme="dark"] {
  --color-background: hsl(210, 30%, 8%);
  --color-surface: hsl(210, 24%, 12%);
  --color-surface-hover: hsl(210, 24%, 16%);
  --color-border: hsl(210, 24%, 20%);
  --color-text: hsl(210, 20%, 95%);
  --color-text-muted: hsl(210, 15%, 65%);
  --color-shadow: hsl(0, 0%, 0%, 0.3);

  --color-primary-light: hsl(174, 84%, 15%);
  --color-success-light: hsl(142, 71%, 15%);
  --color-warning-light: hsl(38, 92%, 15%);
  --color-danger-light: hsl(0, 84%, 15%);
  --color-info-light: hsl(199, 89%, 15%);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  margin-left: var(--space-1);
}

/* ============================================
   RTL (Right-to-Left) SUPPORT
   ============================================ */

[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] .sidebar {
  left: auto;
  right: 0;
}

[dir="rtl"] .main-content {
  margin-left: 0;
  margin-right: 280px;
}

[dir="rtl"] .nav-icon {
  margin-left: var(--space-3);
  margin-right: 0;
}

[dir="rtl"] .flex {
  flex-direction: row-reverse;
}

[dir="rtl"] .text-left {
  text-align: right;
}

[dir="rtl"] .text-right {
  text-align: left;
}

[dir="rtl"] .invoice-header,
[dir="rtl"] .report-header {
  flex-direction: row-reverse;
}

[dir="rtl"] .invoice-table th,
[dir="rtl"] .invoice-table td,
[dir="rtl"] .report-table th,
[dir="rtl"] .report-table td {
  text-align: right;
}

/* Mobile RTL adjustments */
@media (max-width: 768px) {
  [dir="rtl"] .main-content {
    margin-right: 0;
  }

  [dir="rtl"] .sidebar {
    right: -280px;
  }

  [dir="rtl"] .sidebar.open {
    right: 0;
  }
}

p {
  margin-bottom: var(--space-4);
}

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

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

strong {
  font-weight: var(--font-semibold);
}

small {
  font-size: var(--text-sm);
}

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

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

.text-primary {
  color: var(--color-primary);
}

.text-success {
  color: var(--color-success);
}

.text-warning {
  color: var(--color-warning);
}

.text-danger {
  color: var(--color-danger);
}

.text-xs {
  font-size: var(--text-xs);
}

.text-sm {
  font-size: var(--text-sm);
}

.text-base {
  font-size: var(--text-base);
}

.text-lg {
  font-size: var(--text-lg);
}

.text-xl {
  font-size: var(--text-xl);
}

.font-medium {
  font-weight: var(--font-medium);
}

.font-semibold {
  font-weight: var(--font-semibold);
}

.font-bold {
  font-weight: var(--font-bold);
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.7;
  }
}

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }

  50% {
    transform: scale(1.05);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in {
  animation: fadeIn var(--transition-base);
}

.slide-down {
  animation: slideDown var(--transition-base);
}

.slide-up {
  animation: slideUp var(--transition-base);
}

.slide-in-right {
  animation: slideInRight var(--transition-base);
}

.bounce-in {
  animation: bounceIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Page transition wrapper */
.page-transition {
  animation: fadeIn 0.3s ease-in-out;
}

/* Smooth interactions */
.interactive {
  transition: all var(--transition-fast);
}

.interactive:active {
  transform: scale(0.98);
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-background);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* ============================================
   FOCUS STATES
   ============================================ */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   LOADER OVERLAY
   ============================================ */

.loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
}

.loader-overlay.show {
  display: flex;
}

.loader-content {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-4);
}

.loader-message {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

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

#toast-container {
  position: fixed;
  top: var(--space-8);
  right: var(--space-8);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 400px;
}

.toast {
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--color-primary);
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-base);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

.toast.toast-success {
  border-left-color: var(--color-success);
}

.toast.toast-warning {
  border-left-color: var(--color-warning);
}

.toast.toast-error,
.toast.toast-danger {
  border-left-color: var(--color-danger);
}

.toast.toast-info {
  border-left-color: var(--color-info);
}

@media (max-width: 768px) {
  #toast-container {
    top: auto;
    bottom: calc(var(--mobile-nav-height) + var(--space-4));
    left: var(--space-4);
    right: var(--space-4);
    max-width: none;
  }
}