/* ===== CSS Variables ===== */
:root {
  /* Color scheme */
  --primary-gradient-start: #667eea;
  --primary-gradient-mid: #764ba2;
  --primary-gradient-end: #f093fb;
  --secondary-gradient: #4facfe;
  --accent-gradient: #00f2fe;
  
  /* Text colors */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.9);
  --text-muted: rgba(255, 255, 255, 0.7);
  
  /* Button colors */
  --btn-gradient-start: #ff6b6b;
  --btn-gradient-end: #ffa726;
  --btn-shadow: rgba(255, 107, 107, 0.4);
  --btn-hover-shadow: rgba(255, 107, 107, 0.6);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Animation timing */
  --transition-fast: 0.3s;
  --transition-normal: 0.5s;
  --transition-slow: 0.8s;
  --gradient-animation-duration: 15s;
  
  /* Typography */
  --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-logo: clamp(2.5rem, 5vw, 4rem);
  --font-size-feature: clamp(0.9rem, 2vw, 1.1rem);
  --font-size-btn: clamp(1.1rem, 2.5vw, 1.3rem);
  --font-size-countdown: clamp(4rem, 15vw, 8rem);
  
  /* Border radius */
  --border-radius: 12px;
  --border-radius-lg: 20px;
}

/* ===== Reset and Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* ===== Animated Gradient Background ===== */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(
    45deg,
    var(--primary-gradient-start),
    var(--primary-gradient-mid),
    var(--primary-gradient-end),
    var(--secondary-gradient),
    var(--accent-gradient)
  );
  background-size: 400% 400%;
  animation: gradientShift var(--gradient-animation-duration) ease-in-out infinite;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  25% {
    background-position: 100% 50%;
  }
  50% {
    background-position: 100% 100%;
  }
  75% {
    background-position: 0% 100%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* ===== Container and Layout ===== */
.container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  position: relative;
}

.content-wrapper {
  text-align: center;
  max-width: 800px;
  width: 100%;
}

/* ===== Logo Section ===== */
.logo-section {
  margin-bottom: var(--spacing-xl);
}

.logo-text {
  font-size: var(--font-size-logo);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  background: linear-gradient(135deg, #ffffff, #f0f0f0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0;
}

/* ===== Tagline Section ===== */
.tagline-section {
  margin-bottom: var(--spacing-xxl);
}

.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-feature);
  font-weight: 500;
}

.feature-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-secondary);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  font-size: 1.2em;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.feature-separator {
  color: var(--text-muted);
  font-weight: 300;
}

/* ===== Call to Action Section ===== */
.cta-section {
  margin-bottom: var(--spacing-lg);
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: linear-gradient(135deg, var(--btn-gradient-start), var(--btn-gradient-end));
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--font-size-btn);
  font-weight: 600;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 8px 25px var(--btn-shadow);
  transition: all var(--transition-fast) cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.download-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px var(--btn-hover-shadow);
}

.download-btn:hover::before {
  left: 100%;
}

.download-btn:active {
  transform: translateY(0);
}

.btn-arrow {
  font-size: 1.2em;
  transition: transform var(--transition-fast);
}

.download-btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ===== Countdown Styles (download.html) ===== */
.download-page .container {
  background: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius-lg);
  max-width: 600px;
  padding: var(--spacing-xxl);
}

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

.countdown-container {
  margin-bottom: var(--spacing-xl);
}

.countdown-number {
  font-size: var(--font-size-countdown);
  font-weight: 700;
  line-height: 1;
  text-shadow: 0 6px 30px rgba(0, 0, 0, 0.4);
  background: linear-gradient(135deg, #ffffff, #f0f0f0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: countdownPulse var(--transition-slow) ease-in-out;
}

.countdown-label {
  font-size: var(--font-size-feature);
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

@keyframes countdownPulse {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ===== Progress Bar ===== */
.progress-container {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  overflow: hidden;
  margin-top: var(--spacing-lg);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--btn-gradient-start), var(--btn-gradient-end));
  border-radius: 2px;
  width: 0%;
  transition: width 1s linear;
}

/* ===== Fade-in Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--transition-slow) ease-out forwards;
}

.fade-in:nth-child(1) {
  animation-delay: 0.2s;
}

.fade-in:nth-child(2) {
  animation-delay: 0.4s;
}

.fade-in:nth-child(3) {
  animation-delay: 0.6s;
}

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

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-xxl: 2.5rem;
  }
  
  .container {
    padding: var(--spacing-sm);
  }
  
  .features {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .feature-separator {
    display: none;
  }
  
  .download-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  .download-page .container {
    padding: var(--spacing-lg);
    margin: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .feature-item {
    flex-direction: column;
    gap: 4px;
  }
  
  .feature-icon {
    font-size: 1.5em;
  }
}

/* ===== High contrast and accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  body::before {
    animation: none;
    background: var(--primary-gradient-start);
  }
}

/* ===== Focus states for accessibility ===== */
.download-btn:focus {
  outline: 3px solid rgba(255, 255, 255, 0.5);
  outline-offset: 3px;
}

/* ===== Print styles ===== */
@media print {
  body::before {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .download-btn {
    background: #333;
    color: white;
    box-shadow: none;
  }
}