/* style.css - Ballog Landing Page Vanilla CSS */
:root {
  /* Colors */
  --bg-core: #09090b; /* Very dark zinc */
  --bg-surface: #18181b;
  --bg-glass: rgba(24, 24, 27, 0.6);
  --bg-glass-hover: rgba(39, 39, 42, 0.8);
  
  --primary: #3b82f6; /* KBO feeling blue */
  --primary-glow: rgba(59, 130, 246, 0.3);
  --secondary: #8b5cf6;
  --border-light: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(59, 130, 246, 0.5);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  /* Layout */
  --max-w: 1200px;
  --border-radius-sm: 8px;
  --border-radius: 16px;
  --border-radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  color: var(--text-main);
  background-color: var(--bg-core);
  /* smooth scroolbars */
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--bg-core);
}

body {
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.05), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.05), transparent 25%);
}

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

/* Utilities */
.mx-auto { max-width: var(--max-w); margin-left: auto; margin-right: auto; }
.row { display: flex; flex-direction: row; }
.col { display: flex; flex-direction: column; }
.wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.flex-center { align-items: center; justify-content: center; }
.flex { display: flex; }

.gap-xs { gap: 4px; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.gap-xl { gap: 32px; }

.px-sm { padding-left: 8px; padding-right: 8px; }
.px-md { padding-left: 16px; padding-right: 16px; }
.px-lg { padding-left: 24px; padding-right: 24px; }
.px-xl { padding-left: 48px; padding-right: 48px; }
.px-xxl { padding-left: 64px; padding-right: 64px; }

.py-xs { padding-top: 4px; padding-bottom: 4px; }
.py-sm { padding-top: 8px; padding-bottom: 8px; }
.py-md { padding-top: 16px; padding-bottom: 16px; }
.py-lg { padding-top: 24px; padding-bottom: 24px; }
.py-xl { padding-top: 48px; padding-bottom: 48px; }
.py-xxl { padding-top: 64px; padding-bottom: 64px; }
.py-mega { padding-top: 96px; padding-bottom: 96px; }

.pt-mega { padding-top: 160px; }
.pb-xxl { padding-bottom: 64px; }
.pb-md { padding-bottom: 16px; }
.pb-lg { padding-bottom: 24px; }
.mt-xs { margin-top: 4px; }
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.mt-lg { margin-top: 24px; }
.mt-xl { margin-top: 48px; }
.mt-xxl { margin-top: 64px; }
.mt-mega { margin-top: 96px; }
.mb-xs { margin-bottom: 4px; }
.mb-sm { margin-bottom: 8px; }
.mb-md { margin-bottom: 16px; }

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-body { color: var(--text-main); }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.max-w-sm { max-width: 400px; }
.tracking-wide { letter-spacing: 0.05em; }

.relative { position: relative; }
.absolute { position: absolute; }
.overflow-hidden { overflow: hidden; }
.inline-flex { display: inline-flex; }
.w-full { width: 100%; }

.border-t { border-top: 1px solid var(--border-light); }
.border-b { border-bottom: 1px solid var(--border-light); }
.border-light { border: 1px solid var(--border-light); }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-lg); }

.z-10 { z-index: 10; }

.hover-text { transition: color 0.3s; }
.hover-text:hover { color: var(--text-main); }

/* Typography */
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
.hero-title { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; }
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); line-height: 1.6; }
.section-title { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; }
.section-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); }

.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glassmorphism */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
}

/* Components */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 72px;
  z-index: 100;
  border-bottom: 1px solid var(--border-light);
}
.nav-content { height: 100%; padding: 0 24px; }
.logo-img { width: 36px; height: 36px; border-radius: 8px; }
.logo-text { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em; }

.btn {
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-size: 1rem;
}
.btn-nav { font-size: 0.875rem; padding: 8px 16px; }
.btn-lg { padding: 14px 28px; font-size: 1.125rem; border-radius: var(--border-radius); }
.btn-xl { padding: 16px 36px; font-size: 1.25rem; border-radius: var(--border-radius-lg); }

.btn-primary {
  background-color: var(--primary);
  color: white;
}
.btn-primary:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
}
.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--primary-glow);
  filter: brightness(1.1);
}

.badge { border-radius: 20px; font-size: 0.875rem; font-weight: 500; color: #cbd5e1; }
.icon-md { width: 24px; height: 24px; }

/* Effects */
.ripple {
  position: relative;
  overflow: hidden;
}

/* Hero Section */
.hero { min-height: 85vh; }
.hero-text { flex: 1; min-width: 300px; z-index: 10; }
.hero-visual { 
  flex: 1; 
  display: flex; 
  justify-content: center; 
  align-items: center; 
  min-width: 300px;
}
.hero-mockup {
  width: 100%;
  max-width: 320px;
  border-radius: 2rem;
  z-index: 2;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255,255,255,0.1);
}
.floating { animation: float 6s ease-in-out infinite; }

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
  100% { transform: translateY(0px); }
}

.glow-orb {
  position: absolute;
  width: 300px;
  height: 300px;
  background: var(--primary);
  filter: blur(120px);
  border-radius: 50%;
  opacity: 0.3;
  z-index: 0;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: pulse 8s ease-in-out infinite alternate;
}
.orb-alt { background: var(--secondary); top: 30%; left: 30%; opacity: 0.2; animation-delay: -4s; }
.orb-center { width: 500px; height: 500px; opacity: 0.15; top: 0%; left: 50%; }

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
  100% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.5; }
}

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.feature-card {
  padding: 32px 24px;
  border-radius: var(--border-radius);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
}
.feature-emoji { font-size: 28px; }
.feature-card:hover {
  transform: translateY(-8px);
  background: var(--bg-glass-hover);
  border-color: var(--border-glow);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

/* Gallery Slider */
.gallery-wrapper {
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -ms-overflow-style: none; /* IE/Edge */
  scrollbar-width: none; /* Firefox */
  cursor: grab;
}
.gallery-wrapper::-webkit-scrollbar { display: none; }
.gallery-wrapper:active { cursor: grabbing; }

.gallery-img {
  width: auto;
  height: 500px;
  scroll-snap-align: center;
  flex: 0 0 auto;
  object-fit: cover;
  transition: transform 0.4s ease, filter 0.4s ease;
  transform: scale(0.95);
  filter: brightness(0.7);
}
.gallery-img:hover {
  transform: scale(1);
  filter: brightness(1);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

.fade-edge {
  position: absolute; top: 0; bottom: 0; width: 100px; z-index: 5; pointer-events: none;
}
.edge-left { left: 0; background: linear-gradient(to right, var(--bg-core), transparent); }
.edge-right { right: 0; background: linear-gradient(to left, var(--bg-core), transparent); }

/* CTA Area */
.cta-inner { backdrop-filter: blur(20px); border-radius: var(--border-radius-lg); }
.shadow-neon { box-shadow: 0 0 40px rgba(59, 130, 246, 0.1), inset 0 0 20px rgba(255, 255, 255, 0.05); }

/* Scroll Reveal Overlay */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}
.reveal-right { transform: translateX(30px); }
.reveal.active { opacity: 1; transform: translate(0, 0); }

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero { flex-direction: column; text-align: center; }
  .hero-actions { justify-content: center; }
  .mt-xl-mobile { margin-top: 48px; }
  .navbar .nav-btn { display: none; }
  .nav-buttons .btn-nav { font-size: 0.75rem; padding: 6px 10px; }
  .hero-actions { flex-wrap: wrap; }
  .gallery-img { height: 400px; }
  .cta-inner { padding: 32px 16px; }
}