/* ============================================
   PYTHON CHESS - Premium UI Design
   ============================================ */

/* CSS Variables for theming */
:root {
  --primary-color: #37ff8b;
  --primary-glow: rgba(55, 255, 139, 0.4);
  --secondary-color: #00d9ff;
  --background-dark: #0a0a0f;
  --background-medium: #12121a;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-muted: rgba(255, 255, 255, 0.3);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
  font-family: "Outfit", sans-serif;
  color: var(--text-primary);
  background-color: var(--background-dark);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* Animated gradient background */
.background-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(55, 255, 139, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(0, 217, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, var(--background-medium) 0%, var(--background-dark) 100%);
  z-index: -2;
  animation: pulseBackground 8s ease-in-out infinite alternate;
}

@keyframes pulseBackground {
  0% { opacity: 1; }
  100% { opacity: 0.8; }
}

/* Animated grid overlay */
.background-overlay::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: -1;
}

/* Floating particles effect */
.background-overlay::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 25% 25%, var(--primary-color) 0%, transparent 2px),
    radial-gradient(circle at 75% 75%, var(--secondary-color) 0%, transparent 2px),
    radial-gradient(circle at 50% 10%, var(--primary-color) 0%, transparent 1px),
    radial-gradient(circle at 10% 80%, var(--secondary-color) 0%, transparent 1px);
  background-size: 100% 100%;
  opacity: 0.3;
  animation: floatParticles 20s linear infinite;
}

@keyframes floatParticles {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-20px) rotate(5deg); }
}

/* Hero section with glassmorphism */
.hero {
  text-align: center;
  position: relative;
  z-index: 10;
  padding: 4rem 3rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Title with animated gradient */
.title {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  letter-spacing: -2px;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--primary-color) 50%, var(--secondary-color) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 5s ease infinite;
  text-shadow: 0 0 60px var(--primary-glow);
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.5px;
}

/* Premium button with hover effects */
.button {
  margin: 0;
  height: auto;
  background: transparent;
  padding: 0;
  border: none;
  cursor: pointer;
  --border-right: 6px;
  --text-stroke-color: var(--text-secondary);
  --animation-color: var(--primary-color);
  --fs-size: 1.8em;
  letter-spacing: 4px;
  text-decoration: none;
  font-size: var(--fs-size);
  font-family: inherit;
  position: relative;
  text-transform: uppercase;
  color: transparent;
  -webkit-text-stroke: 1px var(--text-stroke-color);
  white-space: nowrap;
  transition: transform 0.3s ease;
}

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

.actual-text {
  position: relative;
  color: transparent;
  -webkit-text-stroke: 1px var(--text-stroke-color);
}

.hover-text {
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  color: var(--animation-color);
  width: 0%;
  height: 100%;
  border-right: 6px solid transparent;
  overflow: hidden;
  transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-text-stroke: 1px var(--animation-color);
  white-space: nowrap;
}

.button:hover .hover-text {
  width: 100%;
  filter: drop-shadow(0 0 30px var(--animation-color));
  border-right: 6px solid var(--animation-color);
}

button:active {
  transform: scale(0.98);
}

/* Status message */
.status {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  height: 20px;
  transition: color 0.3s ease;
}

/* Footer Credits */
.footer {
  position: fixed;
  bottom: 20px;
  right: 30px;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  z-index: 100;
}

/* Social icons */
ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.example-2 {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  position: fixed;
  bottom: 30px;
  left: 30px;
  width: auto;
  z-index: 100;
  gap: 12px;
}

.example-2 .icon-content {
  position: relative;
}

.example-2 .icon-content .tooltip {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  opacity: 0;
  visibility: hidden;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.example-2 .icon-content:hover .tooltip {
  opacity: 1;
  visibility: visible;
  top: -50px;
}

.example-2 .icon-content a {
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.example-2 .icon-content a:hover {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  transform: translateY(-4px);
}

.example-2 .icon-content a svg {
  position: relative;
  z-index: 1;
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
}

.example-2 .icon-content a:hover svg {
  transform: scale(1.1);
}

.example-2 .icon-content a:hover {
  color: white;
}

.example-2 .icon-content a .filled {
  position: absolute;
  top: auto;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0;
  background-color: #000;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 14px;
}

.example-2 .icon-content a:hover .filled {
  height: 100%;
}

.example-2 .icon-content a[data-social="github"] .filled,
.example-2 .icon-content a[data-social="github"] ~ .tooltip {
  background-color: #333;
}

.example-2 .icon-content a[data-social="linkedin"] .filled,
.example-2 .icon-content a[data-social="linkedin"] ~ .tooltip {
  background-color: #0077b5;
}

.example-2 .icon-content a[data-social="leetcode"] .filled,
.example-2 .icon-content a[data-social="leetcode"] ~ .tooltip {
  background-color: #ffa116;
}

/* Game container with premium overlay */
#game-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  z-index: 200;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

#game-frame {
  width: min(95vw, 1200px);
  height: min(85vh, 900px);
  border: 2px solid var(--primary-color);
  border-radius: 16px;
  background: var(--background-dark);
  box-shadow: 
    0 0 60px var(--primary-glow),
    inset 0 0 30px rgba(0, 0, 0, 0.5);
}

.hidden {
  display: none !important;
}

.close-instruction {
  color: var(--text-muted);
  margin-top: 16px;
  font-size: 0.85rem;
  letter-spacing: 1px;
}

/* Premium loader */
.loader {
  width: 56px;
  height: 56px;
  border: 3px solid var(--glass-border);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  margin-bottom: 24px;
  box-shadow: 0 0 20px var(--primary-glow);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  color: var(--primary-color);
  font-family: 'Outfit', sans-serif;
  letter-spacing: 3px;
  font-size: 0.9rem;
  font-weight: 500;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero {
    padding: 2.5rem 1.5rem;
    margin: 1rem;
    border-radius: 16px;
  }

  .title {
    font-size: 2.5rem;
    letter-spacing: -1px;
  }

  .subtitle {
    font-size: 1rem;
  }

  .button {
    --fs-size: 1.3em;
    letter-spacing: 2px;
  }

  .example-2 {
    bottom: 20px;
    left: 20px;
  }

  .footer {
    bottom: 15px;
    right: 20px;
    font-size: 0.75rem;
  }
}