:root {
  --bg-color: #0b0f1a;
  --text-main: #e0e6ed;
  --text-muted: #94a3b8;
  --primary: #00f0ff;
  --secondary: #7000ff;
  --accent: #ff0055;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans KR', sans-serif;
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-body);
  background: var(--bg-color);
  color: var(--text-main);
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  line-height: 1.6;
}

/* Background & Effects */
.bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

#pulse {
  display: block;
}

.grain {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
  opacity: 0.4;
  mix-blend-mode: overlay;
}

/* Typography */
h1, h2, h3, .brand-mark, .stat-num, .chip, .mono {
  font-family: var(--font-display);
  text-transform: uppercase;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s var(--ease);
}

ul {
  list-style: none;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(11,15,26,0.8), transparent);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.brand-mark {
  color: var(--primary);
  font-size: 1.2rem;
  text-shadow: 0 0 10px var(--primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

.nav a:hover {
  opacity: 1;
  color: var(--primary);
}

/* Main */
.main {
  padding-top: 8rem;
  max-width: 1400px;
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 4rem;
  min-height: 80vh;
  align-items: center;
  margin-bottom: 8rem;
}

.kicker {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

.title {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 2rem;
}

.glow {
  display: block;
  background: linear-gradient(45deg, #fff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 15px rgba(0, 240, 255, 0.5));
}

.subtitle {
  display: block;
  font-size: 1.5rem;
  margin-top: 0.5rem;
  font-weight: 300;
  color: var(--text-muted);
}

.lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
  max-width: 500px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s var(--ease);
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn.primary {
  background: var(--primary);
  color: #000;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0,240,255,0.4);
}

.btn.primary:hover {
  background: #fff;
  border-color: #fff;
  box-shadow: 0 0 30px rgba(255,255,255,0.6);
}

.btn:not(.primary):hover {
  border-color: var(--text-main);
  background: rgba(255,255,255,0.1);
}

.cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 4rem;
}

/* Stats */
.stats {
  display: flex;
  gap: 3rem;
  border-top: 1px solid var(--glass-border);
  padding-top: 2rem;
}

.stat-num {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.2rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-body);
}

/* Hero Right: Holo Card */
.holo {
  background: rgba(11, 15, 26, 0.6);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-left: 2px solid var(--accent);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.holo::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: scan 3s linear infinite;
}

@keyframes scan {
  0% { top: 0; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

.card-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.chip {
  font-size: 0.75rem;
  border: 1px solid var(--primary);
  padding: 0.2rem 0.5rem;
  color: var(--primary);
}

#signalChip {
  background: rgba(0,240,255,0.1);
}

.meter {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.1);
  margin-bottom: 1.5rem;
  position: relative;
}

.meter-bar {
  height: 100%;
  background: var(--primary);
  width: 78%;
  box-shadow: 0 0 10px var(--primary);
  transition: width 0.5s var(--ease);
}

.card-text {
  font-size: 1.1rem;
  line-height: 1.5;
  margin-bottom: 2rem;
  font-style: italic;
  color: #fff;
}

.card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Mini Grid */
.mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.mini {
  background: var(--glass);
  padding: 1rem;
  border: 1px solid var(--glass-border);
  transition: transform 0.3s;
}

.mini:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.mini-title {
  color: var(--primary);
  font-size: 0.8rem;
  margin-bottom: 0.3rem;
}

.mini-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Sections */
.section {
  padding: 6rem 0;
}

.h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: #fff;
}

.p {
  color: var(--text-muted);
  max-width: 700px;
  margin-bottom: 3rem;
}

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature {
  padding: 2rem;
  border: 1px solid var(--glass-border);
  background: linear-gradient(180deg, var(--glass), transparent);
}

.feature h3 {
  color: var(--secondary);
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

/* Works */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.work {
  display: block;
  border: 1px solid var(--glass-border);
  padding: 2rem;
  position: relative;
  transition: all 0.3s;
  background: rgba(0,0,0,0.3);
}

.work:hover {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0,240,255,0.2);
  transform: translateY(-5px);
}

.work-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-display);
}

.work-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #fff;
}

.work-sub {
  color: var(--primary);
  font-size: 0.9rem;
}

/* Tech Stack */
.stack {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.stack-col h3 {
  color: var(--accent);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.5rem;
  display: inline-block;
}

.stack-col ul li {
  margin-bottom: 0.8rem;
  color: var(--text-muted);
  position: relative;
  padding-left: 1rem;
}

.stack-col ul li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Contact */
.contact-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 3rem;
  max-width: 800px;
  margin: 0 auto;
}

.contact-row {
  display: flex;
  gap: 3rem;
  margin-bottom: 3rem;
}

.label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
  text-transform: uppercase;
}

.value {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}

.form {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.input {
  flex: 1;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--glass-border);
  padding: 1rem;
  color: #fff;
  font-family: var(--font-body);
}

.input:focus {
  outline: none;
  border-color: var(--primary);
}

.contact-note {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: #555;
}

/* Footer */
.footer {
  padding: 4rem 2rem;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  margin-top: 4rem;
}

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

/* Mobile */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .header {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-left, .hero-right {
    padding: 0 1rem;
  }
  
  .stats {
    justify-content: center;
  }
  
  .feature-grid, .stack {
    grid-template-columns: 1fr;
  }
  
  .contact-row {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .form {
    flex-direction: column;
    align-items: stretch;
  }
}