:root {
  --black: #060709;
  --surface-0: #0a0b0f;
  --surface-1: #101218;
  --surface-2: #161820;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text-main: #f0f0f3;
  --text-dim: #7e8291;
  --text-ghost: #494c58;
  --signal-green: #00ff66;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  background-color: var(--black);
  color: var(--text-main);
  font-family: var(--font-sans);
  overflow-x: hidden;
  line-height: 1.5;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Scanlines overlay */
.scanlines {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 20%, rgba(255, 255, 255, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 100;
}

/* Nav */
.nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-box {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--signal-green);
}

.brand-name {
  font-family: var(--font-mono);
  font-weight: 800;
  letter-spacing: 0.15em;
  font-size: 0.95rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: #ffffff;
}

.nav-btn-download {
  background: #ffffff !important;
  color: #000000 !important;
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 800;
}

.nav-btn-download:hover {
  background: #e0e0e0 !important;
}

/* Hero */
.hero-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 100px 20px 80px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--surface-1);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 28px;
}

.status-pulse {
  width: 6px;
  height: 6px;
  background: var(--signal-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--signal-green);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-gradient {
  background: linear-gradient(180deg, #ffffff 30%, #7e8291 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 640px;
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 40px;
}

/* CTA */
.cta-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: #ffffff;
  color: #000000;
  text-decoration: none;
  padding: 16px 28px;
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.15);
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn-primary:hover {
  background: #eaeaea;
  transform: translateY(-2px);
}

.download-icon {
  width: 24px;
  height: 24px;
}

.btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.btn-main {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.btn-sub {
  font-size: 0.72rem;
  color: #555555;
  font-weight: 600;
}

.cta-meta {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* Features Grid */
.features-grid {
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--surface-0);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: var(--border-strong);
}

.feature-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.f-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--signal-green);
}

.f-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-ghost);
  letter-spacing: 0.1em;
}

.feature-card h3 {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.feature-card p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.5;
}

/* Protocol Section */
.protocol-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 20px 100px;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--signal-green);
  letter-spacing: 0.1em;
}

.section-title h2 {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  margin-top: 6px;
  letter-spacing: 0.05em;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step-card {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  padding: 24px;
  border-radius: 6px;
}

.step-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--signal-green);
  border: 1px solid rgba(0, 255, 102, 0.3);
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.step-card h4 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.45;
}

/* Footer */
.footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 30px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.footer-left p {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.footer-right a {
  color: var(--text-main);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .features-grid { grid-template-columns: 1fr; }
  .steps-container { grid-template-columns: 1fr; }
}