/**
 * Countdown Tết Nguyên Đán - Dark Theme Modern Styles
 *
 * @package Countdown_Tet
 * @version 1.0.0
 */

/* ================================
   CSS Custom Properties (Design System)
   ================================ */
:root {
  /* Colors - Clean Dark Theme (No Neon) */
  --ctet-primary: #DC2626;        /* Classic red */
  --ctet-secondary: #F59E0B;      /* Classic gold */
  --ctet-accent: #FBBF24;         /* Light gold */
  --ctet-success: #10B981;        /* Green */

  /* Dark Theme Colors - Pure Black */
  --ctet-bg-primary: #000000;     /* Pure black */
  --ctet-bg-secondary: #000000;   /* Pure black */
  --ctet-bg-tertiary: #1A1A1A;    /* Very dark gray */

  /* Text Colors */
  --ctet-text-primary: #FFFFFF;   /* Pure white */
  --ctet-text-secondary: #D1D5DB; /* Light gray */
  --ctet-text-muted: #9CA3AF;     /* Medium gray */

  /* Border & Divider */
  --ctet-border: #333333;         /* Dark gray */
  --ctet-border-light: #404040;   /* Lighter dark gray */

  /* Typography */
  --ctet-font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --ctet-font-display: 'Georgia', 'Times New Roman', serif;

  /* Spacing Scale */
  --ctet-space-1: 0.25rem;
  --ctet-space-2: 0.5rem;
  --ctet-space-3: 0.75rem;
  --ctet-space-4: 1rem;
  --ctet-space-6: 1.5rem;
  --ctet-space-8: 2rem;

  /* Border Radius */
  --ctet-radius-sm: 0.375rem;
  --ctet-radius-md: 0.5rem;
  --ctet-radius-lg: 0.75rem;
  --ctet-radius-xl: 1rem;
  --ctet-radius-2xl: 1.5rem;

  /* Shadows - Subtle, no glow */
  --ctet-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --ctet-shadow-md: 0 2px 4px 0 rgba(0, 0, 0, 0.6);
  --ctet-shadow-lg: 0 4px 8px 0 rgba(0, 0, 0, 0.7);
  --ctet-shadow-xl: 0 8px 16px 0 rgba(0, 0, 0, 0.8);

  /* Transitions */
  --ctet-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --ctet-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================
   Base Container - Dark Theme
   ================================ */
.countdown-tet {
  font-family: var(--ctet-font-primary);
  max-width: 600px;
  margin: var(--ctet-space-8) auto;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  color: var(--ctet-text-primary);
}

/* ================================
   Animations
   ================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes flipNumber {
  0% {
    transform: rotateX(0deg);
  }
  50% {
    transform: rotateX(90deg);
  }
  100% {
    transform: rotateX(0deg);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.85;
  }
}

.countdown-tet-animation-fade-in {
  animation: fadeInUp 0.6s ease-out forwards;
}

.countdown-tet-animation-slide-up {
  animation: slideUp 0.6s ease-out forwards;
}

.countdown-tet-animation-scale {
  animation: scaleIn 0.6s ease-out forwards;
}

.countdown-tet-animation-none {
  opacity: 1;
  transform: translateY(0);
}

/* ================================
   Layout: Card (Default) - Dark
   ================================ */
.countdown-tet-layout-card {
  background: var(--ctet-bg-primary);
  border-radius: var(--ctet-radius-lg);
  box-shadow: none;
  padding: var(--ctet-space-6);
  overflow: hidden;
  border: 1px solid var(--ctet-border);
}

/* ================================
   Layout: Compact - Dark
   ================================ */
.countdown-tet-layout-compact {
  background: var(--ctet-bg-secondary);
  border-radius: var(--ctet-radius-lg);
  padding: var(--ctet-space-4);
  box-shadow: var(--ctet-shadow-sm);
  border: 1px solid var(--ctet-border);
}

.countdown-tet-layout-compact .countdown-tet-header {
  margin-bottom: var(--ctet-space-3);
}

.countdown-tet-layout-compact .countdown-tet-timer {
  gap: var(--ctet-space-2);
}

.countdown-tet-layout-compact .countdown-tet-unit {
  padding: var(--ctet-space-2);
}

/* ================================
   Layout: Banner - Dark
   ================================ */
.countdown-tet-layout-banner {
  background: linear-gradient(135deg, #991B1B 0%, #B45309 100%);
  border-radius: var(--ctet-radius-lg);
  padding: var(--ctet-space-6) var(--ctet-space-8);
  color: var(--ctet-text-primary);
  box-shadow: none;
  border: 1px solid var(--ctet-border);
}

.countdown-tet-layout-banner .countdown-tet-title,
.countdown-tet-layout-banner .countdown-tet-zodiac,
.countdown-tet-layout-banner .countdown-tet-message,
.countdown-tet-layout-banner .countdown-tet-date {
  color: var(--ctet-text-primary);
}

/* ================================
   Layout: Minimal - Dark
   ================================ */
.countdown-tet-layout-minimal {
  background: transparent;
  padding: var(--ctet-space-4);
  text-align: center;
}

.countdown-tet-layout-minimal .countdown-tet-timer {
  gap: var(--ctet-space-3);
}

/* ================================
   Style: Gradient (Dark theme - Clean)
   ================================ */
.countdown-tet-style-gradient .countdown-tet-unit {
  background: linear-gradient(135deg, #DC2626, #F59E0B);
  color: #FFFFFF;
  box-shadow: none;
  border: 1px solid rgba(220, 38, 38, 0.3);
}

/* ================================
   Style: Glass (Dark Glassmorphism - Clean)
   ================================ */
.countdown-tet-style-glass {
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid var(--ctet-border);
}

.countdown-tet-style-glass .countdown-tet-unit {
  background: rgba(26, 26, 26, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid var(--ctet-border-light);
  color: #FFFFFF;
  box-shadow: none;
}

/* ================================
   Style: Solid (Dark - Clean)
   ================================ */
.countdown-tet-style-solid .countdown-tet-unit {
  background: var(--ctet-bg-tertiary);
  color: #FFFFFF;
  border: 1px solid var(--ctet-border-light);
  box-shadow: none;
}

/* ================================
   Style: Minimal (Dark - Clean)
   ================================ */
.countdown-tet-style-minimal .countdown-tet-unit {
  background: transparent;
  color: var(--ctet-accent);
  border: 2px solid var(--ctet-primary);
  box-shadow: none;
}

/* ================================
   Style: Dark (Extra dark - Clean)
   ================================ */
.countdown-tet-style-dark .countdown-tet-unit {
  background: #000000;
  color: var(--ctet-accent);
  border: 1px solid var(--ctet-border);
  box-shadow: none;
}

/* ================================
   Header Section - Dark
   ================================ */
.countdown-tet-header {
  text-align: center;
  margin-bottom: var(--ctet-space-6);
}

.countdown-tet-title {
  font-family: var(--ctet-font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--ctet-accent);
  margin: 0 0 var(--ctet-space-2) 0;
  line-height: 1.2;
  text-shadow: none;
}

.countdown-tet-zodiac {
  font-size: 1rem;
  color: var(--ctet-text-secondary);
  margin: 0;
  font-weight: 500;
}

/* ================================
   Body Section - Dark
   ================================ */
.countdown-tet-body {
  position: relative;
}

.countdown-tet-message {
  text-align: center;
  font-size: 1.125rem;
  color: var(--ctet-text-secondary);
  margin: 0 0 var(--ctet-space-6) 0;
  font-weight: 500;
}

.countdown-tet-message-completed {
  font-size: 1.5rem;
  color: var(--ctet-accent);
  font-weight: 700;
  text-shadow: none;
}

/* ================================
   Countdown Timer - Dark
   ================================ */
.countdown-tet-timer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--ctet-space-4);
  margin-bottom: var(--ctet-space-4);
}

.countdown-tet-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--ctet-space-4);
  background: linear-gradient(135deg, #DC2626, #F59E0B);
  border-radius: var(--ctet-radius-md);
  box-shadow: none;
  transition: var(--ctet-transition);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(220, 38, 38, 0.3);
}

.countdown-tet-unit::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
  pointer-events: none;
}

.countdown-tet-unit:hover {
  transform: translateY(-2px);
  box-shadow: var(--ctet-shadow-md);
  border-color: rgba(220, 38, 38, 0.5);
}

.countdown-tet-value {
  display: block;
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: #FFFFFF;
  font-variant-numeric: tabular-nums;
  transition: var(--ctet-transition-fast);
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.countdown-tet-value.flip-animation {
  animation: flipNumber 0.3s ease-in-out;
}

.countdown-tet-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: var(--ctet-space-2);
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
  position: relative;
  z-index: 1;
  text-shadow: none;
}

/* ================================
   Date Display - Dark
   ================================ */
.countdown-tet-date {
  text-align: center;
  font-size: 0.875rem;
  color: var(--ctet-text-muted);
  font-weight: 500;
  padding: var(--ctet-space-3);
  background: var(--ctet-bg-tertiary);
  border-radius: var(--ctet-radius-md);
  border: 1px solid var(--ctet-border);
}

/* ================================
   Completed State - Dark
   ================================ */
.countdown-tet-completed {
  text-align: center;
  padding: var(--ctet-space-8);
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 640px) {
  .countdown-tet {
    margin: var(--ctet-space-4) auto;
  }

  .countdown-tet-layout-card,
  .countdown-tet-layout-banner {
    padding: var(--ctet-space-4);
  }

  .countdown-tet-timer {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--ctet-space-3);
  }

  .countdown-tet-unit {
    padding: var(--ctet-space-3);
  }

  .countdown-tet-value {
    font-size: 2rem;
  }

  .countdown-tet-label {
    font-size: 0.625rem;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .countdown-tet-timer {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ================================
   Print Styles
   ================================ */
@media print {
  .countdown-tet {
    box-shadow: none;
    border: 1px solid var(--ctet-border);
  }

  .countdown-tet-unit {
    box-shadow: none;
    break-inside: avoid;
  }
}

/* ================================
   Light Mode Override (Optional)
   ================================ */
@media (prefers-color-scheme: light) {
  :root {
    /* Light theme colors */
    --ctet-primary: #DC2626;
    --ctet-secondary: #D97706;
    --ctet-accent: #F59E0B;

    --ctet-bg-primary: #FFFFFF;
    --ctet-bg-secondary: #F8FAFC;
    --ctet-bg-tertiary: #F1F5F9;

    --ctet-text-primary: #0F172A;
    --ctet-text-secondary: #475569;
    --ctet-text-muted: #64748B;

    --ctet-border: #E2E8F0;
    --ctet-border-light: #CBD5E1;

    /* Light shadows */
    --ctet-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --ctet-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ctet-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ctet-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --ctet-glow-red: 0 0 15px rgba(220, 38, 38, 0.2);
    --ctet-glow-gold: 0 0 15px rgba(217, 119, 6, 0.2);
  }

  .countdown-tet-title {
    text-shadow: none;
  }

  .countdown-tet-value {
    text-shadow: none;
  }

  .countdown-tet-style-glass {
    background: rgba(248, 250, 252, 0.8);
    border: 1px solid rgba(148, 163, 184, 0.3);
  }

  .countdown-tet-style-glass .countdown-tet-unit {
    background: rgba(220, 38, 38, 0.08);
    border: 1px solid rgba(220, 38, 38, 0.2);
    color: var(--ctet-primary);
  }
}

/* ================================
   Accessibility
   ================================ */
.countdown-tet:focus-within {
  outline: 2px solid var(--ctet-primary);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .countdown-tet,
  .countdown-tet-unit,
  .countdown-tet-value {
    animation: none !important;
    transition: none !important;
  }

  .countdown-tet-unit:hover {
    transform: none;
  }
}

/* Screen reader only text */
.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;
}

/* ================================
   Special Effects for Tết
   ================================ */
.countdown-tet-unit.countdown-near {
  animation: pulseGlow 2s ease-in-out infinite;
}

/* Subtle pulse when less than 7 days */
.countdown-tet[data-days-remaining="7"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="6"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="5"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="4"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="3"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="2"] .countdown-tet-unit,
.countdown-tet[data-days-remaining="1"] .countdown-tet-unit {
  animation: pulseGlow 2s ease-in-out infinite;
}