/* ============================================
   DESIGN SYSTEM - CSS CUSTOM PROPERTIES
   ============================================ */

:root {
  /* Color Palette - Chilean Flag Inspired (Red, White, Blue) */
  /* Chilean Flag Blue (Azul Turquí) - Approx #0039A6 */
  --color-primary: hsl(219, 100%, 33%);
  --color-primary-light: hsl(219, 80%, 45%);
  --color-primary-dark: hsl(219, 100%, 25%);

  --color-secondary: hsl(145, 70%, 45%);
  /* Festive Green */
  --color-accent: hsl(145, 70%, 45%);
  --color-success: hsl(150, 60%, 45%);
  --color-warning: hsl(45, 95%, 50%);

  /* Light Mode Colors */
  --color-bg-light: hsl(210, 30%, 98%);
  --color-bg-medium: hsl(210, 25%, 95%);
  --color-surface: hsl(0, 0%, 100%);
  --color-surface-hover: hsl(210, 30%, 97%);

  /* Text Colors */
  --color-text-primary: hsl(210, 20%, 20%);
  --color-text-secondary: hsl(210, 15%, 45%);
  --color-text-muted: hsl(210, 10%, 60%);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, hsl(210, 100%, 55%) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-secondary) 0%, hsl(145, 70%, 55%) 100%);
  --gradient-bg: linear-gradient(135deg, hsl(210, 40%, 96%) 0%, hsl(210, 35%, 98%) 50%, hsl(200, 30%, 97%) 100%);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(0, 107, 179, 0.2);

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 107, 179, 0.15);
  --glass-blur: 12px;
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--gradient-bg);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-3xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

h2 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

header {
  display: flex;
  justify-content: flex-start;
  align-items: baseline;
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-md);
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

header h1 {
  margin-bottom: 0;
  font-size: var(--font-size-3xl);
  flex-shrink: 0;
}

.subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0;
  text-align: left;
  max-width: 800px;
  position: relative;
  padding-left: var(--spacing-md);
}

.subtitle::before {
  content: '|';
  position: absolute;
  left: 0;
  color: var(--glass-border);
}

.logo-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.logo {
  max-width: 300px;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.1));
  transition: transform var(--transition-base);
}

.logo:hover {
  transform: scale(1.05);
}

/* ============================================
   COUNTDOWN SECTION
   ============================================ */

.countdown-section {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  animation: float 3s ease-in-out infinite;
}

.countdown-section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.countdown-title {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.countdown-display {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  background: linear-gradient(90deg,
      var(--color-secondary) 0%,
      var(--color-primary) 50%,
      var(--color-secondary) 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  animation: gradientShift 3s ease infinite, pulse 2s ease-in-out infinite;
}

.countdown-holiday {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  font-weight: 500;
}

.countdown-date {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-top: var(--spacing-xs);
}

/* ============================================
   NEXT HOLIDAY SECTION (Less Prominent)
   ============================================ */

.next-holiday-section {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-sm);
  opacity: 0.85;
  transition: opacity var(--transition-base);
}

.next-holiday-section:hover {
  opacity: 1;
}

.next-holiday-title {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.next-holiday-info {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-weight: 600;
}

/* ============================================
   FILTERS
   ============================================ */

.filters {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.filter-btn:hover {
  background: var(--glass-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.filter-btn.active {
  background: var(--gradient-primary);
  border-color: transparent;
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transform: translateY(-2px);
  color: white;
}

/* ============================================
   HOLIDAYS GRID
   ============================================ */

.holidays-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   HOLIDAY CARD
   ============================================ */

.holiday-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.holiday-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.holiday-card:hover::before {
  transform: scaleX(1);
}

.holiday-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(255, 255, 255, 0.2);
}

.holiday-card.irrenunciable {
  border-color: var(--color-secondary);
  box-shadow: 0 4px 16px rgba(34, 139, 87, 0.2);
  animation: fadeIn var(--transition-slow) ease-out backwards, glow 3s ease-in-out infinite;
}

.holiday-card.irrenunciable::before {
  background: var(--gradient-accent);
}

/* Past Holiday Cards - Visually Distinct */
.holiday-card.past {
  opacity: 0.6;
  filter: grayscale(0.3);
  position: relative;
}

.holiday-card.past::after {
  content: '✓';
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  width: 32px;
  height: 32px;
  background: var(--color-text-muted);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: 700;
  opacity: 0.7;
}

.holiday-card.past:hover {
  opacity: 0.8;
  filter: grayscale(0.2);
  transform: translateY(-4px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.holiday-date {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
}

.date-day {
  font-size: var(--font-size-3xl);
  display: block;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.date-month {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--spacing-xs);
  display: block;
}

.badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  background: var(--color-secondary);
  color: white;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.holiday-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.3;
}

.holiday-name-en {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

.holiday-meta {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  background: var(--color-bg-medium);
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
}

.holiday-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.holiday-info svg {
  width: 16px;
  height: 16px;
  opacity: 0.7;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  :root {
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.5rem;
    --font-size-xl: 1.25rem;
  }

  .container {
    padding: var(--spacing-md);
  }

  header {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) 0;
  }

  header h1 {
    margin-bottom: var(--spacing-xs);
  }

  .subtitle {
    text-align: center;
    font-size: var(--font-size-base);
    padding-left: 0;
  }

  .subtitle::before {
    display: none;
  }

  .holidays-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .filters {
    gap: var(--spacing-xs);
  }

  .filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .logo {
    max-width: 200px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .holidays-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1400px) {
  .holidays-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

@keyframes glow {

  0%,
  100% {
    box-shadow: var(--shadow-md);
  }

  50% {
    box-shadow: var(--shadow-lg), var(--shadow-glow);
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-5px);
  }
}

.holiday-card {
  animation: fadeIn var(--transition-slow) ease-out backwards;
}

.holiday-card:nth-child(1) {
  animation-delay: 50ms;
}

.holiday-card:nth-child(2) {
  animation-delay: 100ms;
}

.holiday-card:nth-child(3) {
  animation-delay: 150ms;
}

.holiday-card:nth-child(4) {
  animation-delay: 200ms;
}

.holiday-card:nth-child(5) {
  animation-delay: 250ms;
}

.holiday-card:nth-child(6) {
  animation-delay: 300ms;
}

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

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}