/**
 * Yemzikk.in Design System
 * Unified styles, colors, and components for the entire portfolio
 * Last updated: December 1, 2025
 */

/* ==================== CSS Variables / Design Tokens ==================== */
:root {
  /* Brand Colors */
  --color-primary: #3498db;
  --color-primary-dark: #2980b9;
  --color-primary-light: #60a5fa;
  --color-secondary: #10b981;
  --color-secondary-dark: #059669;
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;
  --color-accent-light: #fbbf24;
  --color-teal: #14b8a6;
  --color-teal-dark: #0d9488;
  --color-teal-light: #2dd4bf;
  --color-purple: #8b5cf6;
  --color-purple-dark: #7c3aed;
  --color-indigo: #4f46e5;
  --color-amber: #f59e0b;

  /* Neutral Colors */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-warning-light: #fbbf24;
  --color-error: #ef4444;
  --color-error-dark: #dc2626;
  --color-error-light: #fca5a5;
  --color-info: #3b82f6;

  /* Background Colors */
  --bg-base: #ffffff;
  --bg-elevated: #f9fafb;
  --bg-overlay: rgba(0, 0, 0, 0.5);

  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  /* Border Colors */
  --border-base: #e5e7eb;
  --border-strong: #d1d5db;
  --border-focus: #3498db;

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Typography Scale */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 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-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

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

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-base: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1),
    0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal-backdrop: 40;
  --z-modal: 50;
  --z-popover: 60;
  --z-tooltip: 70;
}

/* Dark Mode Variables */
.dark {
  --bg-base: #111827;
  --bg-elevated: #1f2937;
  --bg-overlay: rgba(0, 0, 0, 0.75);

  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --text-inverse: #111827;

  --border-base: #374151;
  --border-strong: #4b5563;
  --border-focus: #60a5fa;
}

/* Ensure body background changes with theme */
body {
  background-color: #f3f4f6;
}

.dark body {
  background-color: #111827;
}

/* ==================== Global Resets & Base Styles ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

/* ==================== Typography ==================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
}

h1 {
  font-size: var(--font-size-5xl);
}

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

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

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

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

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

p {
  margin: 0;
  color: var(--text-secondary);
}

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

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

a:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ==================== Accessibility ==================== */
/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-tooltip);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}

.skip-to-main:focus {
  top: var(--space-4);
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Focus visible styles */
*:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Screen reader only content */
.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;
}

/* ==================== Component Styles ==================== */

/* Button Base */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px; /* WCAG touch target size */
}

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

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--text-inverse);
}

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

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

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-elevated);
  border-color: var(--color-primary);
}

/* Card Component */
.card {
  background-color: var(--bg-base);
  border: 1px solid var(--border-base);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-base);
  transition: all var(--transition-base);
}

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

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background-color: #fef3c7;
  color: #92400e;
}

.badge-error {
  background-color: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background-color: #dbeafe;
  color: #1e40af;
}

/* Dark mode badge colors */
.dark .badge-success {
  background-color: #065f46;
  color: #d1fae5;
}

.dark .badge-warning {
  background-color: #92400e;
  color: #fef3c7;
}

.dark .badge-error {
  background-color: #991b1b;
  color: #fee2e2;
}

.dark .badge-info {
  background-color: #1e40af;
  color: #dbeafe;
}

/* Input Component */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  border: 1px solid var(--border-base);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input::placeholder {
  color: var(--text-tertiary);
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid var(--border-base);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-fixed);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-base);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
  .theme-toggle {
    top: env(safe-area-inset-top, 1rem);
    right: env(safe-area-inset-right, 1rem);
    font-size: var(--font-size-xs);
    padding: var(--space-2) var(--space-4);
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

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

.bg-elevated {
  background-color: var(--bg-elevated);
}

.rounded {
  border-radius: var(--radius-base);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.shadow {
  box-shadow: var(--shadow-base);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

/* Design System Color Utilities */
.bg-primary {
  background-color: var(--color-primary);
}

.bg-primary-dark {
  background-color: var(--color-primary-dark);
}

.bg-secondary {
  background-color: var(--color-secondary);
}

.bg-secondary-dark {
  background-color: var(--color-secondary-dark);
}

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

.bg-warning {
  background-color: var(--color-warning);
}

.bg-error {
  background-color: var(--color-error);
}

.bg-teal {
  background-color: var(--color-teal);
}

.bg-teal-dark {
  background-color: var(--color-teal-dark);
}

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

.text-brand-secondary {
  color: var(--color-secondary);
}

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

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

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

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

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

.border-base {
  border-color: var(--border-base);
}

.border-strong {
  border-color: var(--border-strong);
}

/* Additional Color Utilities */
.text-indigo-600 {
  color: var(--color-indigo);
}

.text-amber-400 {
  color: var(--color-amber);
}

.bg-purple {
  background-color: var(--color-purple);
}

.bg-purple-dark {
  background-color: var(--color-purple-dark);
}

/* Selection Colors */
::selection {
  background-color: var(--color-primary-light);
  color: var(--text-inverse);
}

::-moz-selection {
  background-color: var(--color-primary-light);
  color: var(--text-inverse);
}

/* Light theme card backgrounds */
.card {
  background-color: #ffffff;
  border-color: #e5e7eb;
}

/* Light theme inputs */
.input {
  background-color: #ffffff;
  border-color: #e5e7eb;
  color: #111827;
}

.input:focus {
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.input::placeholder {
  color: #9ca3af;
}

/* Dark theme card backgrounds */
.dark .card {
  background-color: #1a1f2e;
  border-color: #2d3548;
}

/* Dark theme input backgrounds */
.dark .input {
  background-color: #1a1f2e;
  border-color: #2d3548;
  color: #f9fafb;
}

.dark .input:focus {
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.dark .input::placeholder {
  color: #6b7280;
}

/* Dark theme select backgrounds */
.dark select.input {
  background-color: #1a1f2e;
  border-color: #2d3548;
}