/* ============================================
   Hellword: Flame Verse - Dark Puzzle Mystique
   Color Scheme: Obsidian Black & Crimson Ember
   Typography: Sharp Serif Display + Monospace
   ============================================ */

/* CSS Variables */
:root {
  /* Colors - Obsidian Black & Crimson Ember */
  --color-black-void: #000000;
  --color-black-altar: #0A0A0A;
  --color-black-stone: #1A0A0A;
  --color-black-shadow: #0D0D0D;
  --color-crimson-primary: #DC143C;
  --color-crimson-deep: #B22222;
  --color-crimson-dark: #8B0000;
  --color-ember-bright: #FF4500;
  --color-ember-glow: #FF6347;
  --color-text-light: #FAFAFA;
  --color-text-gray: #CCCCCC;
  --color-text-dim: #999999;
  
  /* Typography */
  --font-serif: 'Georgia', 'Times New Roman', serif;
  --font-mono: 'Courier New', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
  --mobile-header-height: 56px;
  
  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-ember: 0 0 20px rgba(220, 20, 60, 0.4);
  --shadow-ember-intense: 0 0 30px rgba(255, 69, 0, 0.6);
  --shadow-dark: 0 4px 12px rgba(0, 0, 0, 0.8);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-light);
  background-color: var(--color-black-void);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  background: none;
}

/* ============================================
   Sticky Header
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--mobile-header-height);
  background: linear-gradient(180deg, var(--color-black-altar) 0%, rgba(10, 10, 10, 0.95) 100%);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(220, 20, 60, 0.2);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

.header-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.header-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 0 10px rgba(220, 20, 60, 0.3);
}

.header-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-crimson-primary);
  display: none;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-link {
  display: none;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-gray);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link:active {
  color: var(--color-crimson-primary);
  background-color: rgba(220, 20, 60, 0.1);
}

.cta-button-small {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-crimson-primary), var(--color-ember-bright));
  color: var(--color-text-light);
  border-radius: 50%;
  box-shadow: var(--shadow-ember);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.cta-button-small:hover,
.cta-button-small:active {
  transform: translateY(-2px);
  box-shadow: var(--shadow-ember-intense);
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
  min-height: 100vh;
  padding: calc(var(--mobile-header-height) + var(--spacing-xl)) var(--spacing-sm) var(--spacing-xl);
  background: radial-gradient(ellipse at center, rgba(220, 20, 60, 0.15) 0%, var(--color-black-void) 70%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(220, 20, 60, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255, 69, 0, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.hero-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-ember);
  animation: iconPulse 3s ease-in-out infinite;
}

@keyframes iconPulse {
  0%, 100% {
    transform: scale(1);
    filter: drop-shadow(0 0 20px rgba(220, 20, 60, 0.4));
  }
  50% {
    transform: scale(1.05);
    filter: drop-shadow(0 0 30px rgba(255, 69, 0, 0.6));
  }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-crimson-primary);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-description {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-gray);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
}

.download-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 28px;
  min-width: 260px;
  min-height: 64px;
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  transition: all var(--transition-base);
  position: relative;
}

.download-button.google-play {
  background: linear-gradient(135deg, var(--color-crimson-primary) 0%, var(--color-ember-bright) 50%, var(--color-ember-glow) 100%);
  color: var(--color-text-light);
  border: 3px solid var(--color-crimson-deep);
  box-shadow: var(--shadow-ember);
}

.download-button.google-play:hover,
.download-button.google-play:active {
  transform: translateY(-3px);
  box-shadow: var(--shadow-ember-intense);
}

.download-button.app-store {
  background: #2a2a2a;
  color: var(--color-text-dim);
  border: 3px solid #2a2a2a;
  opacity: 0.55;
  filter: grayscale(0.6);
  cursor: not-allowed;
  position: relative;
}

.store-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.button-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.3;
}

.button-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

.button-store {
  font-size: 1.25rem;
  font-weight: 700;
}

.coming-soon-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--color-ember-bright);
  color: var(--color-text-light);
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: var(--border-radius-sm);
  letter-spacing: 0.05em;
}

.hero-visual {
  width: 100%;
  max-width: 500px;
  margin-top: var(--spacing-lg);
}

.hero-banner {
  width: 100%;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.8), var(--shadow-ember);
  border: 2px solid rgba(220, 20, 60, 0.3);
}

/* ============================================
   Features Section
   ============================================ */

.features-section {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background: linear-gradient(180deg, var(--color-black-void) 0%, var(--color-black-shadow) 50%, var(--color-black-void) 100%);
}

.features-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  letter-spacing: 0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.feature-card {
  background: linear-gradient(135deg, var(--color-black-stone) 0%, var(--color-black-altar) 100%);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 2px solid rgba(220, 20, 60, 0.2);
  box-shadow: var(--shadow-dark);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.feature-card.revealed {
  animation: featureReveal 0.6s ease forwards;
}

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

.feature-card:hover,
.feature-card:active {
  transform: translateY(-4px);
  border-color: rgba(220, 20, 60, 0.5);
  box-shadow: var(--shadow-dark), var(--shadow-ember);
}

.feature-icon {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: var(--spacing-md);
  filter: drop-shadow(0 0 8px rgba(255, 69, 0, 0.5));
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-crimson-primary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.01em;
}

.feature-description {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-gray);
}

/* ============================================
   Download CTA Section
   ============================================ */

.download-cta-section {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-crimson-dark) 0%, var(--color-black-altar) 50%, var(--color-ember-bright) 100%);
  position: relative;
  overflow: hidden;
}

.download-cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, transparent 0%, rgba(0, 0, 0, 0.6) 100%);
  pointer-events: none;
}

.download-cta-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
}

.cta-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-gray);
  margin-bottom: var(--spacing-xl);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
}

.download-buttons-large {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: center;
}

.download-button-large {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 18px 36px;
  min-width: 280px;
  min-height: 72px;
  border-radius: var(--border-radius-lg);
  font-weight: 700;
  transition: all var(--transition-base);
  position: relative;
}

.download-button-large.google-play {
  background: linear-gradient(135deg, var(--color-crimson-primary) 0%, var(--color-ember-bright) 50%, var(--color-ember-glow) 100%);
  color: var(--color-text-light);
  border: 3px solid var(--color-crimson-deep);
  box-shadow: 0 4px 16px rgba(220, 20, 60, 0.5);
}

.download-button-large.google-play:hover,
.download-button-large.google-play:active {
  transform: translateY(-4px);
  box-shadow: 0 6px 24px rgba(255, 69, 0, 0.7);
}

.download-button-large.app-store {
  background: #2a2a2a;
  color: var(--color-text-dim);
  border: 3px solid #2a2a2a;
  opacity: 0.55;
  filter: grayscale(0.6);
  cursor: not-allowed;
}

.store-icon-large {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.button-text-large {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.3;
}

.button-label-large {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.95;
}

.button-store-large {
  font-size: 1.5rem;
  font-weight: 800;
}

.coming-soon-badge-large {
  position: absolute;
  top: -10px;
  right: -10px;
  background: var(--color-ember-bright);
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: var(--border-radius-md);
  letter-spacing: 0.05em;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* ============================================
   About Section
   ============================================ */

.about-section {
  padding: var(--spacing-2xl) var(--spacing-sm);
  background: linear-gradient(180deg, var(--color-black-void) 0%, var(--color-black-stone) 100%);
}

.about-container {
  max-width: 800px;
  margin: 0 auto;
}

.about-content {
  margin-top: var(--spacing-xl);
}

.about-text {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text-gray);
  margin-bottom: var(--spacing-lg);
}

.about-contact {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(220, 20, 60, 0.2);
  font-size: 1rem;
  color: var(--color-text-gray);
}

.contact-link {
  color: var(--color-crimson-primary);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.contact-link:hover,
.contact-link:active {
  color: var(--color-ember-bright);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  padding: var(--spacing-xl) var(--spacing-sm) var(--spacing-lg);
  background: var(--color-black-altar);
  border-top: 1px solid rgba(220, 20, 60, 0.2);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-sm);
}

.footer-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-crimson-primary);
}

.footer-contact {
  font-size: 0.9375rem;
  color: var(--color-text-gray);
}

.footer-link {
  color: var(--color-crimson-primary);
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:active {
  color: var(--color-ember-bright);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
}

.separator {
  color: var(--color-text-dim);
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--color-text-dim);
  margin-top: var(--spacing-sm);
}

/* ============================================
   Mobile Sticky CTA
   ============================================ */

.mobile-sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-sm);
  background: linear-gradient(180deg, transparent 0%, rgba(10, 10, 10, 0.98) 20%, rgba(10, 10, 10, 0.98) 100%);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(220, 20, 60, 0.3);
  z-index: 999;
  opacity: 0;
  transform: translateY(100%);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-sticky-cta.visible {
  opacity: 1;
  transform: translateY(0);
}

.mobile-cta-button {
  display: block;
  width: 100%;
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--color-crimson-primary) 0%, var(--color-ember-bright) 50%, var(--color-ember-glow) 100%);
  color: var(--color-text-light);
  font-size: 1.0625rem;
  font-weight: 700;
  text-align: center;
  border-radius: var(--border-radius-lg);
  border: 3px solid var(--color-crimson-deep);
  box-shadow: var(--shadow-ember);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.mobile-cta-button:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-ember-intense);
}

/* ============================================
   Responsive Design - Tablet & Desktop
   ============================================ */

@media (min-width: 768px) {
  /* Header */
  .site-header {
    height: var(--header-height);
  }
  
  .header-container {
    padding: 0 var(--spacing-lg);
  }
  
  .header-title {
    display: block;
  }
  
  .nav-link {
    display: block;
  }
  
  .cta-button-small {
    display: none;
  }
  
  /* Hero */
  .hero-section {
    padding: calc(var(--header-height) + var(--spacing-2xl)) var(--spacing-lg) var(--spacing-2xl);
  }
  
  .hero-container {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-2xl);
  }
  
  .hero-content {
    flex: 1;
    text-align: left;
    margin-bottom: 0;
  }
  
  .hero-icon {
    margin: 0 0 var(--spacing-lg) 0;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .hero-description {
    margin: 0 0 var(--spacing-xl) 0;
  }
  
  .download-buttons {
    flex-direction: row;
    justify-content: flex-start;
  }
  
  .hero-visual {
    flex: 0 0 45%;
    max-width: 600px;
    margin-top: 0;
  }
  
  /* Features */
  .features-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }
  
  /* Download CTA */
  .download-cta-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
  
  .download-buttons-large {
    flex-direction: row;
    justify-content: center;
  }
  
  /* About */
  .about-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
  
  /* Footer */
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
  }
  
  .footer-brand {
    order: 1;
  }
  
  .footer-legal {
    order: 2;
  }
  
  .footer-contact {
    order: 3;
    flex: 0 0 100%;
    margin-top: var(--spacing-sm);
  }
  
  .footer-copyright {
    order: 4;
    flex: 0 0 100%;
  }
  
  /* Hide mobile sticky CTA */
  .mobile-sticky-cta {
    display: none;
  }
}

@media (min-width: 1024px) {
  /* Hero */
  .hero-title {
    font-size: 4rem;
  }
  
  .hero-subtitle {
    font-size: 1.375rem;
  }
  
  .hero-description {
    font-size: 1.125rem;
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  /* Section Titles */
  .section-title {
    font-size: 2.5rem;
  }
  
  .cta-title {
    font-size: 2.75rem;
  }
}

/* ============================================
   Accessibility
   ============================================ */

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

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-crimson-primary);
  outline-offset: 2px;
}

/* Ensure sufficient contrast for text */
::selection {
  background-color: var(--color-crimson-primary);
  color: var(--color-text-light);
}