@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Color Palette */
  --bg-dark: #090d16;
  --bg-card: rgba(255, 255, 255, 0.03);
  --border-card: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Accent Colors */
  --color-primary: #ff2d55;     /* Neon Pink */
  --color-secondary: #007aff;   /* iOS Blue */
  --color-success: #34c759;     /* iOS Green */
  --color-warning: #ff9500;     /* iOS Orange */
  --color-purple: #af52de;      /* iOS Purple */
  
  /* Blocks (Playable Grid colors) */
  --block-2: #1e293b;
  --block-4: #334155;
  --block-8: #0284c7;
  --block-16: #7c3aed;
  --block-32: #db2777;
  --block-64: #ea580c;
  --block-128: #e11d48;
  
  --shadow-glow: 0 0 15px rgba(255, 45, 85, 0.4);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 16px;
}

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

html, body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  overflow-x: hidden;
  scroll-behavior: smooth;
  line-height: 1.6;
}

/* Background Gradients & Glows */
body::before {
  content: '';
  position: absolute;
  top: -10%;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 45, 85, 0.1) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 122, 255, 0.08) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 13, 22, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-card);
  transition: var(--transition-smooth);
}

header.scrolled {
  padding: 10px 0;
  background: rgba(9, 13, 22, 0.85);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition-smooth);
}

header.scrolled .nav-container {
  padding: 12px 24px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.3rem;
  box-shadow: 0 0 15px rgba(255, 45, 85, 0.3);
}

.logo-text {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

nav a:hover, nav a.active {
  color: var(--text-primary);
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.nav-btn {
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: white !important;
  padding: 8px 20px;
  border-radius: 20px;
  box-shadow: 0 4px 15px rgba(255, 45, 85, 0.2);
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 45, 85, 0.35);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Main Container */
main {
  margin-top: 80px;
  min-height: calc(100vh - 240px);
}

/* Hero Section */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px 120px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 4.2rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 580px;
}

.cta-group {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.app-store-badge {
  display: inline-flex;
  align-items: center;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 8px 18px;
  text-decoration: none;
  color: white;
  transition: var(--transition-smooth);
}

.app-store-badge:hover {
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}

.badge-icon {
  font-size: 1.8rem;
  margin-right: 12px;
}

.badge-text {
  display: flex;
  flex-direction: column;
}

.badge-subtitle {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.badge-title {
  font-size: 1.05rem;
  font-weight: 600;
}

.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--bg-card);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Interactive Board Container */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.interactive-demo-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 24px;
  padding: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  animation: float 6s ease-in-out infinite;
}

.demo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.demo-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.demo-hint {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  animation: pulse-glow 2s infinite;
}

/* 4x4 Playable Grid */
.game-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  background: rgba(0, 0, 0, 0.2);
  padding: 12px;
  border-radius: 16px;
  aspect-ratio: 1;
}

.grid-cell {
  position: relative;
  aspect-ratio: 1;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.6rem;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-smooth);
}

.grid-cell:hover {
  transform: scale(1.05);
}

.grid-cell:active {
  transform: scale(0.95);
}

/* Dynamic Block Values */
.block-v-2 { background-color: var(--block-2); color: #94a3b8; }
.block-v-4 { background-color: var(--block-4); color: #cbd5e1; }
.block-v-8 { 
  background-color: var(--block-8); 
  color: white; 
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.4);
}
.block-v-16 { 
  background-color: var(--block-16); 
  color: white;
  box-shadow: 0 0 12px rgba(124, 58, 237, 0.5);
}
.block-v-32 { 
  background-color: var(--block-32); 
  color: white;
  box-shadow: 0 0 15px rgba(219, 39, 119, 0.6);
}
.block-v-64 { 
  background-color: var(--block-64); 
  color: white;
  box-shadow: 0 0 18px rgba(234, 88, 12, 0.7);
}
.block-v-128 { 
  background-color: var(--block-128); 
  color: white;
  box-shadow: 0 0 25px rgba(225, 29, 72, 0.9);
  animation: hyper-glow 1.5s infinite alternate;
}

/* Animations for gameplay */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; text-shadow: 0 0 4px var(--color-primary); }
  50% { opacity: 1; text-shadow: 0 0 12px var(--color-primary), 0 0 20px var(--color-primary); }
}

@keyframes hyper-glow {
  0% { box-shadow: 0 0 15px rgba(225, 29, 72, 0.7); }
  100% { box-shadow: 0 0 30px rgba(225, 29, 72, 1), 0 0 10px rgba(225, 29, 72, 0.5); }
}

.merge-anim {
  animation: pop-merge 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes pop-merge {
  0% { transform: scale(0.6); opacity: 0.5; }
  50% { transform: scale(1.25); }
  100% { transform: scale(1); opacity: 1; }
}

/* Features Section */
.features-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 70px;
}

.section-header h2 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--border-radius);
  padding: 40px 32px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::before {
  background: linear-gradient(to right, var(--color-primary), var(--color-purple));
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: rgba(255, 45, 85, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--color-primary);
  margin-bottom: 28px;
  transition: var(--transition-smooth);
}

.feature-card:nth-child(2) .feature-icon {
  background: rgba(0, 122, 255, 0.1);
  color: var(--color-secondary);
}

.feature-card:nth-child(3) .feature-icon {
  background: rgba(175, 82, 222, 0.1);
  color: var(--color-purple);
}

.feature-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* Content Pages (Terms, Privacy, Support) Layout */
.content-wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px 120px;
}

.content-header {
  margin-bottom: 48px;
}

.content-header h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.content-body {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 40px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.content-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 36px;
  margin-bottom: 16px;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 8px;
}

.content-body h2:first-of-type {
  margin-top: 0;
}

.content-body p, .content-body ul, .content-body ol {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.content-body ul, .content-body ol {
  padding-left: 24px;
}

.content-body li {
  margin-bottom: 8px;
}

.content-body a {
  color: var(--color-secondary);
  text-decoration: none;
}

.content-body a:hover {
  text-decoration: underline;
}

/* Support Form Elements */
.support-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.form-control {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-card);
  border-radius: 10px;
  padding: 14px 16px;
  color: white;
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: var(--transition-smooth);
}

.form-control:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 10px rgba(0, 122, 255, 0.25);
  background: rgba(0, 0, 0, 0.4);
}

textarea.form-control {
  resize: vertical;
  min-height: 150px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: white;
  border: none;
  border-radius: 10px;
  padding: 14px 28px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(255, 45, 85, 0.25);
  align-self: flex-start;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 45, 85, 0.4);
}

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

.form-status {
  padding: 16px;
  border-radius: 10px;
  font-weight: 500;
  display: none;
  animation: fadeIn 0.4s ease-in-out;
}

.form-status.success {
  background: rgba(52, 199, 89, 0.1);
  border: 1px solid rgba(52, 199, 89, 0.3);
  color: #34c759;
  display: block;
}

.form-status.error {
  background: rgba(255, 45, 85, 0.1);
  border: 1px solid rgba(255, 45, 85, 0.3);
  color: #ff2d55;
  display: block;
}

/* Footer */
footer {
  background: rgba(5, 7, 12, 0.95);
  border-top: 1px solid var(--border-card);
  padding: 60px 24px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-branding {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  width: 100%;
  text-align: center;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Styles */
@media (max-width: 968px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 60px 24px;
    gap: 40px;
  }
  
  .hero-content h1 {
    font-size: 3.2rem;
  }
  
  .hero-content p {
    margin: 0 auto 32px;
  }
  
  .cta-group {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .nav-container {
    padding: 16px;
  }
  
  .menu-toggle {
    display: block;
  }
  
  nav {
    display: none;
    position: absolute;
    top: 79px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-card);
    padding: 24px;
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.5);
  }
  
  nav.open {
    display: block;
    animation: fadeIn 0.3s ease-out;
  }
  
  nav ul {
    flex-direction: column;
    gap: 20px;
    align-items: stretch;
    text-align: center;
  }
  
  nav a {
    display: block;
    padding: 8px 0;
  }
  
  .nav-btn {
    display: inline-block !important;
    margin-top: 10px;
  }
  
  .content-body {
    padding: 24px 16px;
  }
  
  .content-header h1 {
    font-size: 2.2rem;
  }
}