/**
 * Centuple Blog PHP - Material Design 3 System
 * Light Theme avec accents Google Blue
 *
 * @author Centuple.ai
 * @version 2.0.0 - Material Design Edition
 */

/* ===== GOOGLE FONTS - MODERN TYPOGRAPHY ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== CSS RESET ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* ===== MATERIAL DESIGN 3 - DESIGN TOKENS (LIGHT THEME) ===== */
:root {
  /* === M3 Color System - Light Theme (Google Blue) === */

  /* Primary - Google Blue */
  --md-primary: #1A73E8;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #D3E3FD;
  --md-on-primary-container: #041E49;

  /* Secondary */
  --md-secondary: #5F6368;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #E8EAED;
  --md-on-secondary-container: #1F1F1F;

  /* Tertiary (Green accent) */
  --md-tertiary: #1E8E3E;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #CEEAD6;
  --md-on-tertiary-container: #0D652D;

  /* Error */
  --md-error: #D93025;
  --md-on-error: #FFFFFF;
  --md-error-container: #F9DEDC;
  --md-on-error-container: #410E0B;

  /* Surface & Background */
  --md-surface: #FFFFFF;
  --md-surface-dim: #DDD9D9;
  --md-surface-bright: #FEF7FF;
  --md-surface-container-lowest: #FFFFFF;
  --md-surface-container-low: #F7F2F2;
  --md-surface-container: #F1F3F4;
  --md-surface-container-high: #E8EAED;
  --md-surface-container-highest: #DADCE0;

  /* On Surface */
  --md-on-surface: #202124;
  --md-on-surface-variant: #5F6368;

  /* Outline */
  --md-outline: #80868B;
  --md-outline-variant: #DADCE0;

  /* Background */
  --md-background: #F8F9FA;
  --md-on-background: #202124;

  /* Inverse */
  --md-inverse-surface: #303134;
  --md-inverse-on-surface: #F1F3F4;
  --md-inverse-primary: #A8C7FA;

  /* Scrim & Shadow */
  --md-scrim: rgba(0, 0, 0, 0.32);
  --md-shadow: #000000;

  /* === M3 Elevation System (Light Theme) === */
  --md-elevation-0: none;
  --md-elevation-1: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --md-elevation-2: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
  --md-elevation-3: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
  --md-elevation-4: 0 2px 3px 0 rgba(60, 64, 67, 0.3), 0 6px 10px 4px rgba(60, 64, 67, 0.15);
  --md-elevation-5: 0 4px 4px 0 rgba(60, 64, 67, 0.3), 0 8px 12px 6px rgba(60, 64, 67, 0.15);

  /* === M3 Typography Scale === */
  --md-font-brand: 'Inter', system-ui, -apple-system, sans-serif;
  --md-font-plain: 'Inter', system-ui, -apple-system, sans-serif;
  --md-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Display */
  --md-display-large: 700 3.5625rem/4rem var(--md-font-brand);
  --md-display-medium: 700 2.8125rem/3.25rem var(--md-font-brand);
  --md-display-small: 700 2.25rem/2.75rem var(--md-font-brand);

  /* Headline */
  --md-headline-large: 700 2rem/2.5rem var(--md-font-brand);
  --md-headline-medium: 700 1.75rem/2.25rem var(--md-font-brand);
  --md-headline-small: 700 1.5rem/2rem var(--md-font-brand);

  /* Title */
  --md-title-large: 500 1.375rem/1.75rem var(--md-font-brand);
  --md-title-medium: 500 1rem/1.5rem var(--md-font-brand);
  --md-title-small: 500 0.875rem/1.25rem var(--md-font-brand);

  /* Body */
  --md-body-large: 400 1rem/1.5rem var(--md-font-plain);
  --md-body-medium: 400 0.875rem/1.25rem var(--md-font-plain);
  --md-body-small: 400 0.75rem/1rem var(--md-font-plain);

  /* Label */
  --md-label-large: 500 0.875rem/1.25rem var(--md-font-plain);
  --md-label-medium: 500 0.75rem/1rem var(--md-font-plain);
  --md-label-small: 500 0.6875rem/1rem var(--md-font-plain);

  /* === M3 Shape System === */
  --md-shape-none: 0px;
  --md-shape-extra-small: 4px;
  --md-shape-small: 8px;
  --md-shape-medium: 12px;
  --md-shape-large: 16px;
  --md-shape-extra-large: 28px;
  --md-shape-full: 9999px;

  /* === M3 Motion System === */
  /* Duration */
  --md-duration-short1: 50ms;
  --md-duration-short2: 100ms;
  --md-duration-short3: 150ms;
  --md-duration-short4: 200ms;
  --md-duration-medium1: 250ms;
  --md-duration-medium2: 300ms;
  --md-duration-medium3: 350ms;
  --md-duration-medium4: 400ms;
  --md-duration-long1: 450ms;
  --md-duration-long2: 500ms;
  --md-duration-long3: 550ms;
  --md-duration-long4: 600ms;

  /* Easing - Material Motion Curves */
  --md-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-easing-standard-decelerate: cubic-bezier(0, 0, 0, 1);
  --md-easing-standard-accelerate: cubic-bezier(0.3, 0, 1, 1);
  --md-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-easing-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
  --md-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
  --md-easing-legacy: cubic-bezier(0.4, 0, 0.2, 1);

  /* === Spacing System === */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

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

  /* === State Layer Opacity === */
  --md-state-hover: 0.08;
  --md-state-focus: 0.12;
  --md-state-pressed: 0.12;
  --md-state-dragged: 0.16;
}

/* ===== BASE STYLES ===== */
html {
  font: var(--md-body-large);
  color: var(--md-on-surface);
  background-color: var(--md-background);
}

body {
  min-height: 100vh;
  background-color: var(--md-background);
}

/* Selection styling */
::selection {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: var(--md-shape-extra-small);
}

/* ===== M3 TYPOGRAPHY ===== */
h1 {
  font: var(--md-display-small);
  color: var(--md-on-surface);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

h2 {
  font: var(--md-headline-large);
  color: var(--md-on-surface);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

h3 {
  font: var(--md-headline-medium);
  color: var(--md-on-surface);
  margin-bottom: var(--space-3);
}

h4 {
  font: var(--md-headline-small);
  color: var(--md-on-surface);
  margin-bottom: var(--space-2);
}

h5 {
  font: var(--md-title-large);
  color: var(--md-on-surface);
  margin-bottom: var(--space-2);
}

h6 {
  font: var(--md-title-medium);
  color: var(--md-on-surface);
  margin-bottom: var(--space-2);
}

p {
  font: var(--md-body-large);
  color: var(--md-on-surface-variant);
  margin-bottom: var(--space-4);
}

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color var(--md-duration-short4) var(--md-easing-standard);
  position: relative;
}

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

/* Animated underline for links */
a:not(.btn):not(.card-link):not(.nav-link):not(.logo)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--md-primary);
  transition: width var(--md-duration-medium2) var(--md-easing-emphasized);
}

a:not(.btn):not(.card-link):not(.nav-link):not(.logo):hover::after {
  width: 100%;
}

/* ===== M3 COMPONENTS ===== */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-6);
  min-height: 40px;
  font: var(--md-label-large);
  letter-spacing: 0.1px;
  border-radius: var(--md-shape-full);
  transition:
    background-color var(--md-duration-short4) var(--md-easing-standard),
    box-shadow var(--md-duration-short4) var(--md-easing-standard),
    transform var(--md-duration-short3) var(--md-easing-standard);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

/* Ripple effect base */
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--md-duration-short4) var(--md-easing-standard);
}

.btn:hover::before {
  opacity: var(--md-state-hover);
}

.btn:active::before {
  opacity: var(--md-state-pressed);
}

/* Filled Button (Primary) */
.btn-primary {
  background-color: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-0);
}

.btn-primary:hover {
  box-shadow: var(--md-elevation-1);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--md-elevation-0);
}

/* Outlined Button (Secondary) */
.btn-secondary {
  background-color: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}

.btn-secondary:hover {
  background-color: rgba(26, 115, 232, 0.08);
  border-color: var(--md-primary);
}

/* Tonal Button */
.btn-tonal {
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.btn-tonal:hover {
  box-shadow: var(--md-elevation-1);
}

/* === Header / Top App Bar === */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-3) 0;
  transition:
    background-color var(--md-duration-medium2) var(--md-easing-standard),
    box-shadow var(--md-duration-medium2) var(--md-easing-standard),
    border-color var(--md-duration-medium2) var(--md-easing-standard),
    transform var(--md-duration-medium2) var(--md-easing-standard);
}

.header.scrolled {
  box-shadow: var(--md-elevation-2);
  border-bottom-color: var(--md-outline-variant);
  background-color: rgba(255, 255, 255, 0.95);
}

.header.header-hidden {
  transform: translateY(-100%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* Logo - Redesigned */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--md-on-surface);
  transition: transform var(--md-duration-short4) var(--md-easing-standard);
}

.logo:hover {
  transform: scale(1.02);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--md-primary) 0%, #4285F4 50%, #34A853 100%);
  color: var(--md-on-primary);
  border-radius: var(--md-shape-medium);
  box-shadow: var(--md-elevation-1);
  transition:
    box-shadow var(--md-duration-short4) var(--md-easing-standard),
    transform var(--md-duration-short4) var(--md-easing-standard);
}

.logo:hover .logo-icon {
  box-shadow: var(--md-elevation-3);
  transform: rotate(-5deg) scale(1.05);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: -0.02em;
}

.logo-accent {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--md-primary), #34A853);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-tagline {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Navigation Desktop */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font: var(--md-label-large);
  color: var(--md-on-surface-variant);
  text-decoration: none;
  border-radius: var(--md-shape-full);
  position: relative;
  overflow: hidden;
  transition:
    color var(--md-duration-short4) var(--md-easing-standard),
    background-color var(--md-duration-short4) var(--md-easing-standard);
}

.nav-link svg {
  opacity: 0.7;
  transition: opacity var(--md-duration-short4) var(--md-easing-standard);
}

.nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: var(--md-primary);
  opacity: 0;
  transition: opacity var(--md-duration-short4) var(--md-easing-standard);
  border-radius: inherit;
}

.nav-link:hover {
  color: var(--md-primary);
}

.nav-link:hover svg {
  opacity: 1;
}

.nav-link:hover::before {
  opacity: var(--md-state-hover);
}

.nav-link.active {
  color: var(--md-primary);
  background-color: var(--md-primary-container);
  font-weight: 600;
}

.nav-link.active svg {
  opacity: 1;
}

.nav-link.active::before {
  display: none;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Language Switcher - Redesigned */
.lang-switcher {
  position: relative;
}

.lang-current {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-full);
  cursor: pointer;
  font: var(--md-label-large);
  color: var(--md-on-surface);
  transition: all var(--md-duration-short4) var(--md-easing-standard);
}

.lang-current:hover {
  background: var(--md-surface-container-high);
  border-color: var(--md-outline);
}

.lang-flag {
  font-size: 1.1rem;
  line-height: 1;
}

.lang-code {
  font-weight: 600;
  font-size: 0.75rem;
}

.lang-arrow {
  transition: transform var(--md-duration-short4) var(--md-easing-standard);
}

.lang-current[aria-expanded="true"] .lang-arrow {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 160px;
  background: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-medium);
  box-shadow: var(--md-elevation-3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--md-duration-short4) var(--md-easing-standard);
  list-style: none;
  padding: var(--space-1);
  z-index: 100;
}

.lang-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown li {
  margin: 0;
}

.lang-dropdown a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  color: var(--md-on-surface);
  text-decoration: none;
  border-radius: var(--md-shape-small);
  font: var(--md-body-medium);
  transition: background-color var(--md-duration-short4) var(--md-easing-standard);
}

.lang-dropdown a:hover {
  background: var(--md-surface-container);
}

.lang-dropdown a.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-weight: 500;
}

/* Header CTA */
.header-cta {
  gap: var(--space-2);
}

.header-cta svg {
  transition: transform var(--md-duration-short4) var(--md-easing-standard);
}

.header-cta:hover svg {
  transform: translateX(3px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--md-shape-full);
  cursor: pointer;
  transition: background-color var(--md-duration-short4) var(--md-easing-standard);
}

.mobile-menu-toggle:hover {
  background: var(--md-surface-container);
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--md-on-surface);
  border-radius: 2px;
  transition: all var(--md-duration-short4) var(--md-easing-standard);
  transform-origin: center;
}

.mobile-menu-toggle.active .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-toggle.active .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline-variant);
  box-shadow: var(--md-elevation-3);
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--md-duration-medium2) var(--md-easing-emphasized);
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--md-on-surface);
  text-decoration: none;
  font: var(--md-title-medium);
  border-radius: var(--md-shape-medium);
  transition: all var(--md-duration-short4) var(--md-easing-standard);
}

.mobile-nav-link:hover {
  background: var(--md-surface-container);
}

.mobile-nav-link.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.mobile-nav-link svg {
  opacity: 0.7;
}

.mobile-nav-link.active svg {
  opacity: 1;
}

.mobile-lang {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--md-outline-variant);
}

.mobile-lang-label {
  display: block;
  font: var(--md-label-medium);
  color: var(--md-on-surface-variant);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mobile-lang-options {
  display: flex;
  gap: var(--space-2);
}

.mobile-lang-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--md-surface-container);
  border-radius: var(--md-shape-small);
  color: var(--md-on-surface);
  text-decoration: none;
  font: var(--md-label-large);
  transition: all var(--md-duration-short4) var(--md-easing-standard);
}

.mobile-lang-btn:hover {
  background: var(--md-surface-container-high);
}

.mobile-lang-btn.active {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.mobile-cta {
  margin-top: var(--space-4);
  width: 100%;
  justify-content: center;
}

/* Body menu open state */
body.menu-open {
  overflow: hidden;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-desktop {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }
}

@media (max-width: 480px) {
  .logo-text {
    display: none;
  }

  .lang-code {
    display: none;
  }
}

/* Legacy nav compatibility */
.nav {
  display: none;
}

/* ===== PAGE SECTIONS ===== */

/* Hero Section */
.hero {
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.hero-title {
    font: var(--md-display-medium);
}
.hero-subtitle {
    font: var(--md-headline-small);
    color: var(--md-on-surface-variant);
    max-width: 700px;
    margin: 0 auto;
}
.section-title {
    font: var(--md-headline-large);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--md-outline-variant);
}

.featured-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background-color: var(--md-surface);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-extra-large);
    overflow: hidden;
    transition: all var(--md-duration-short4) var(--md-easing-standard);
    margin-bottom: var(--space-12);
}
.featured-card:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-4px);
}
.featured-card a {
    text-decoration: none;
    color: inherit;
    display: contents;
}
.featured-image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
}
.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--md-duration-long2) var(--md-easing-emphasized);
}
.featured-card:hover .featured-image img {
    transform: scale(1.05);
}
.featured-content {
    padding: var(--space-8);
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.featured-meta {
    font: var(--md-label-large);
    color: var(--md-on-surface-variant);
    margin-bottom: var(--space-3);
}
.featured-title {
    font: var(--md-headline-small);
    margin-bottom: var(--space-3);
}
.featured-description {
    font: var(--md-body-large);
    color: var(--md-on-surface-variant);
    margin-bottom: var(--space-6);
}
.featured-cta {
    font: var(--md-label-large);
    color: var(--md-primary);
    font-weight: 700;
}

@media (max-width: 768px) {
    .featured-card {
        grid-template-columns: 1fr;
    }
}
.card {
    background-color: var(--md-surface);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-large);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition:
        border-color var(--md-duration-medium2) var(--md-easing-standard),
        box-shadow var(--md-duration-medium2) var(--md-easing-emphasized),
        transform var(--md-duration-medium2) var(--md-easing-emphasized);
}

.card:hover {
    border-color: var(--md-outline);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-4px);
}

.card a {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-image-wrapper {
    height: 200px;
    overflow: hidden;
    background-color: var(--md-surface-container);
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--md-duration-long2) var(--md-easing-emphasized);
}

.card:hover .card-image {
    transform: scale(1.05);
}

.card-content {
    padding: var(--space-5);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font: var(--md-title-large);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.card:hover .card-title {
    color: var(--md-primary);
}

.card-excerpt {
    font: var(--md-body-medium);
    color: var(--md-on-surface-variant);
    flex-grow: 1;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font: var(--md-label-medium);
    color: var(--md-on-surface-variant);
    margin-bottom: var(--space-3);
}

/* Article Card */
.article-card {
  border-radius: var(--md-shape-extra-large);
}



/* === Tags/Chips === */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font: var(--md-label-large);
  border-radius: var(--md-shape-small);
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  transition:
    background-color var(--md-duration-short4) var(--md-easing-standard),
    transform var(--md-duration-short3) var(--md-easing-standard);
}

.tag:hover {
  background-color: var(--md-secondary-container);
  transform: scale(1.02);
}

/* ===== ARTICLE PROSE ===== */
article.prose {
  max-width: 760px;
}

.prose h1 {
  font: var(--md-display-small);
  line-height: 1.2;
  margin-bottom: var(--space-4);
  letter-spacing: -0.5px;
  color: var(--md-on-surface); /* Explicitly set for contrast */
}

.prose .lead {
  font: var(--md-headline-small);
  color: var(--md-on-surface-variant);
  margin-bottom: var(--space-8);
}

.prose .content {
  font: var(--md-body-large);
  color: var(--md-on-surface);
  line-height: 1.8;
}

.prose .content h2 {
  font: var(--md-headline-large);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--md-outline-variant);
}

.prose .content h3 {
  font: var(--md-headline-medium);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.prose .content p {
  margin-bottom: var(--space-6);
}

.prose .content ul,
.prose .content ol {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
  color: var(--md-on-surface-variant);
}

.prose .content li {
  margin-bottom: var(--space-2);
}

.prose .content li::marker {
  color: var(--md-primary);
}

.prose .content blockquote {
  border-left: 4px solid var(--md-primary);
  padding: var(--space-4);
  padding-left: var(--space-6);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--md-on-surface-variant);
  background-color: var(--md-surface-container);
  border-radius: 0 var(--md-shape-medium) var(--md-shape-medium) 0;
}

.prose .content pre {
  background-color: #1E1E1E;
  color: #D4D4D4;
  padding: var(--space-4);
  border-radius: var(--md-shape-medium);
  overflow-x: auto;
  font-family: var(--md-font-mono);
  font-size: 0.9rem;
  margin: var(--space-6) 0;
  box-shadow: var(--md-elevation-1);
}

.prose .content code {
  font-family: var(--md-font-mono);
  font-size: 0.9em;
  background-color: var(--md-surface-container-high);
  padding: 0.2em 0.5em;
  border-radius: var(--md-shape-extra-small);
  color: var(--md-tertiary);
}

.prose .content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Ensure legibility of all elements within <pre> blocks on dark backgrounds. */
.prose .content pre h1,
.prose .content pre h2,
.prose .content pre h3,
.prose .content pre h4,
.prose .content pre h5,
.prose .content pre h6,
.prose .content pre p,
.prose .content pre ul,
.prose .content pre ol,
.prose .content pre li,
.prose .content pre a,
.prose .content pre strong,
.prose .content pre em {
  color: inherit;
}

.prose .content img {
  border-radius: var(--md-shape-large);
  max-width: 100%;
  height: auto;
  margin: var(--space-8) 0;
  box-shadow: var(--md-elevation-2);
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--md-surface-container-low);
  border-top: 1px solid var(--md-outline-variant);
  padding: var(--space-12) 0;
  margin-top: var(--space-12);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer p {
  font: var(--md-body-medium);
  color: var(--md-on-surface-variant);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font: var(--md-body-medium);
  color: var(--md-on-surface-variant);
  transition:
    color var(--md-duration-short4) var(--md-easing-standard),
    transform var(--md-duration-short4) var(--md-easing-standard);
}

.footer-links a:hover {
  color: var(--md-primary);
  transform: translateY(-2px);
}

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

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

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Animation utility classes */
.animate-fade-in {
  animation: fadeIn var(--md-duration-medium2) var(--md-easing-emphasized-decelerate) forwards;
}

.animate-slide-up {
  animation: slideInUp var(--md-duration-medium4) var(--md-easing-emphasized-decelerate) forwards;
}

.animate-scale-in {
  animation: scaleIn var(--md-duration-medium2) var(--md-easing-emphasized-decelerate) forwards;
}

/* Staggered animation delays */
.stagger-1 { animation-delay: 50ms; }
.stagger-2 { animation-delay: 100ms; }
.stagger-3 { animation-delay: 150ms; }
.stagger-4 { animation-delay: 200ms; }
.stagger-5 { animation-delay: 250ms; }

/* Loading skeleton */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--md-surface-container) 25%,
    var(--md-surface-container-high) 50%,
    var(--md-surface-container) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--md-shape-small);
}

/* ===== UTILITIES ===== */

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Print styles */
@media print {
  .header,
  .footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}

/* Mobile */
@media (max-width: 767px) {
  .hero h1 {
    font: var(--md-display-small);
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--md-surface-container);
}

::-webkit-scrollbar-thumb {
  background: var(--md-outline);
  border-radius: var(--md-shape-full);
  transition: background var(--md-duration-short4) var(--md-easing-standard);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--md-primary);
}

.grid-categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-6);
}

.category-card {
    background: var(--md-surface-container);
    border: 1px solid var(--md-outline-variant);
    padding: var(--space-6);
    border-radius: var(--md-shape-large);
    text-decoration: none;
    color: var(--md-on-surface);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: all var(--md-duration-short4) var(--md-easing-standard);
    box-shadow: var(--md-elevation-1);
}

.category-card:hover {
    border-color: var(--md-primary);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-4px);
    background: var(--md-surface-container-high);
}

.category-name {
    font: var(--md-title-large);
    color: var(--md-on-surface);
    margin-bottom: var(--space-2);
}

.category-count {
    font: var(--md-label-medium);
    color: var(--md-on-surface-variant);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--md-outline) var(--md-surface-container);
}