/* ============================================
   MEGA AUTO PARTS - Design System
   Enterprise-Grade WordPress-Ready UI
   ============================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Primary Brand Colors */
  --mega-orange: #26407D;
  --mega-orange-hover: #1B3060;
  --mega-orange-light: #EEF1F7;
  --mega-orange-glow: rgba(38, 64, 125, 0.15);

  /* Dark Palette */
  --mega-black: #0A0A0A;
  --mega-dark: #111111;
  --mega-dark-card: #1A1A1A;
  --mega-dark-border: #2A2A2A;
  --mega-dark-hover: #222222;

  /* Neutral Palette */
  --mega-gray-900: #1A1A2E;
  --mega-gray-800: #2D2D3F;
  --mega-gray-700: #3D3D50;
  --mega-gray-600: #5A5A6E;
  --mega-gray-500: #7A7A8E;
  --mega-gray-400: #9E9EB0;
  --mega-gray-300: #C4C4D0;
  --mega-gray-200: #E2E2EA;
  --mega-gray-100: #F4F4F8;
  --mega-gray-50: #FAFAFE;

  /* White */
  --mega-white: #FFFFFF;

  /* Semantic Colors */
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --info: #3B82F6;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.7rem, 0.66rem + 0.2vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.76rem + 0.2vw, 0.9rem);
  --text-base: clamp(0.9rem, 0.86rem + 0.2vw, 1rem);
  --text-lg: clamp(1rem, 0.93rem + 0.35vw, 1.2rem);
  --text-xl: clamp(1.15rem, 1.05rem + 0.5vw, 1.4rem);
  --text-2xl: clamp(1.4rem, 1.2rem + 1vw, 1.9rem);
  --text-3xl: clamp(1.7rem, 1.4rem + 1.5vw, 2.5rem);
  --text-4xl: clamp(2rem, 1.6rem + 2vw, 3.2rem);
  --text-5xl: clamp(2.5rem, 1.9rem + 3vw, 4.2rem);
  --text-6xl: clamp(3rem, 2.2rem + 4vw, 5.5rem);

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

  /* Line Heights */
  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.1em;

  /* 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;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;
  --container-2xl: 1400px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 40px rgba(38, 64, 125, 0.2);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}


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

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--mega-gray-800);
  background-color: var(--mega-white);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--mega-black);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  color: var(--mega-gray-600);
  line-height: var(--leading-relaxed);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { list-style: none; }

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-8); }
}

@media (min-width: 1200px) {
  .container { padding: 0 var(--space-12); }
}

.section {
  padding: var(--space-20) 0;
}

.section-lg {
  padding: var(--space-32) 0;
}

/* Section Headers */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-16);
}

.section-header .overline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--mega-orange);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-4);
}

.section-header .overline::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--mega-orange);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  white-space: nowrap;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

.btn-primary {
  background: var(--mega-orange);
  color: var(--mega-white);
  border-color: var(--mega-orange);
}

.btn-primary:hover {
  background: var(--mega-orange-hover);
  border-color: var(--mega-orange-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-outline {
  background: transparent;
  color: var(--mega-orange);
  border-color: var(--mega-orange);
}

.btn-outline:hover {
  background: var(--mega-orange);
  color: var(--mega-white);
  transform: translateY(-2px);
}

.btn-dark {
  background: var(--mega-black);
  color: var(--mega-white);
  border-color: var(--mega-black);
}

.btn-dark:hover {
  background: var(--mega-gray-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-white {
  background: var(--mega-white);
  color: var(--mega-black);
  border-color: var(--mega-white);
}

.btn-white:hover {
  background: var(--mega-gray-100);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--mega-white);
  border-color: rgba(255,255,255,0.3);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
}

/* --- Cards --- */
.card {
  background: var(--mega-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--mega-gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--mega-gray-300);
}

.card-dark {
  background: var(--mega-dark-card);
  border-color: var(--mega-dark-border);
}

.card-dark:hover {
  border-color: var(--mega-gray-700);
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.badge-orange {
  background: var(--mega-orange-light);
  color: var(--mega-orange);
}

.badge-dark {
  background: var(--mega-dark);
  color: var(--mega-white);
}

.badge-success {
  background: #D1FAE5;
  color: #065F46;
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--mega-gray-700);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  color: var(--mega-gray-800);
  background: var(--mega-white);
  border: 1.5px solid var(--mega-gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--mega-orange);
  box-shadow: 0 0 0 3px var(--mega-orange-glow);
}

.form-input::placeholder {
  color: var(--mega-gray-400);
}

.form-input-lg {
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* --- Grid System --- */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

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

.animate-fade-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

/* Staggered Delays */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--mega-gray-100);
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--mega-gray-600);
}

/* --- Dark Section Background --- */
.bg-dark {
  background: var(--mega-dark);
  color: var(--mega-white);
}

.bg-dark h2, .bg-dark h3, .bg-dark h4 {
  color: var(--mega-white);
}

.bg-dark p {
  color: var(--mega-gray-400);
}

.bg-gradient-dark {
  background: linear-gradient(135deg, #0A0A0A 0%, #1A1A2E 100%);
}

.bg-light {
  background: var(--mega-gray-50);
}

/* --- Text Utilities --- */
.text-orange { color: var(--mega-orange); }
.text-white { color: var(--mega-white); }
.text-muted { color: var(--mega-gray-500); }
.text-center { text-align: center; }
.text-left { text-align: left; }

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

/* --- Divider --- */
.divider {
  width: 60px;
  height: 3px;
  background: var(--mega-orange);
  border-radius: var(--radius-full);
}

.divider-center {
  margin: var(--space-4) auto;
}

/* --- Icon Box --- */
.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--mega-orange-light);
  color: var(--mega-orange);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  transition: all var(--transition-base);
}

.icon-box:hover {
  background: var(--mega-orange);
  color: var(--mega-white);
  transform: scale(1.05);
}

/* Selection */
::selection {
  background: var(--mega-orange);
  color: var(--mega-white);
}