/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --bg-card: #0f1118;
  --bg-card-hover: #141822;
  --text: #c8ccd4;
  --text-bright: #e8ecf4;
  --text-dim: #5a6070;
  --green: #22c55e;
  --green-dim: #16a34a;
  --green-glow: rgba(34, 197, 94, 0.12);
  --cyan: #22d3ee;
  --yellow: #eab308;
  --border: #1a1e28;
  --border-green: rgba(34, 197, 94, 0.25);
  --radius: 8px;
  --max-w: 960px;
  --font-hud: 'Share Tech Mono', monospace;
  --font-code: 'Fira Code', monospace;
  --font-body: 'Space Grotesk', -apple-system, sans-serif;
}

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 { font-family: var(--font-hud); letter-spacing: 0.04em; }

h2 {
  font-size: 1.6rem;
  margin-bottom: 0.4rem;
  text-align: center;
  color: var(--green);
}

h2::before { content: '## '; color: var(--text-dim); }

.section-desc {
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-code);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

.section-desc::before { content: '// '; }

section { padding: 72px 0; }

section:nth-child(odd) {
  background: linear-gradient(180deg, #0c0c12 0%, var(--bg) 100%);
}

a { color: var(--green); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--cyan); text-shadow: 0 0 8px rgba(34, 211, 238, 0.3); }

/* === Sticky Nav === */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 12px 0;
  font-family: var(--font-hud);
  transition: background 0.3s, box-shadow 0.3s;
}

.nav-scrolled {
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1rem;
  color: var(--green) !important;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-family: var(--font-hud);
  padding-bottom: 2px;
  position: relative;
}

.nav-links a::before { content: './'; color: var(--text-dim); opacity: 0.4; }

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--green);
  transition: width 0.25s;
}

.nav-links a:hover, .nav-links a.active { color: var(--green); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-gh {
  background: var(--border);
  padding: 5px 12px !important;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.nav-gh::before { content: ''; }
.nav-gh:hover { border-color: var(--green); }

/* === Scanlines Overlay === */
.scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  z-index: 1;
}

/* === Hero === */
.hero {
  text-align: center;
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px; left: 50%;
  transform: translateX(-50%);
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--green-glow) 0%, transparent 70%);
  pointer-events: none;
}

.terminal-line {
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  position: relative;
  z-index: 2;
}

.prompt { color: var(--green); font-weight: 700; }
.flag { color: var(--cyan); }

.hero h1 {
  font-size: 3.2rem;
  font-weight: 400;
  color: var(--text-bright);
  margin-bottom: 12px;
  position: relative;
  z-index: 2;
  text-shadow: 0 0 40px var(--green-glow);
}

.blink {
  color: var(--green);
  animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.tagline {
  font-family: var(--font-code);
  font-size: 1.1rem;
  color: var(--green);
  margin-bottom: 10px;
  position: relative;
  z-index: 2;
}

.subtitle {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 2;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
  position: relative;
  z-index: 2;
}

.hero-badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}

.badge {
  font-family: var(--font-code);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  font-family: var(--font-hud);
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--green);
  color: #0a0a0f;
  box-shadow: 0 0 16px var(--green-glow);
}
.btn-primary:hover {
  background: #2dd66b;
  color: #0a0a0f;
  box-shadow: 0 0 24px rgba(34, 197, 94, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-1px);
}

/* === Scroll Fade-in === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Features === */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  transition: all 0.25s;
  position: relative;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--green), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}

.feature-card:hover {
  border-color: var(--border-green);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon { font-size: 2rem; margin-bottom: 12px; }

.feature-card h3 {
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text-bright);
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* === Demo === */
.demo-video {
  max-width: 360px;
  max-height: 640px;
  margin: 0 auto;
  aspect-ratio: 9 / 16;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

.demo-video iframe {
  width: 100%; height: 100%;
  border: none;
}

/* === Download === */
.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.install-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.install-card h3 {
  font-size: 0.9rem;
  margin-bottom: 14px;
  color: var(--green);
}

.install-card-highlight {
  border-color: var(--border-green);
  background: linear-gradient(145deg, #0f1118, #0f160f);
}

.install-badge {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--green);
  color: #0a0a0f;
  font-family: var(--font-hud);
  font-size: 0.68rem;
  padding: 3px 10px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  z-index: 1;
}

.install-desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 18px;
}

.btn-download {
  display: inline-block;
  margin-bottom: 14px;
  padding: 13px 28px;
}

.install-hint {
  font-size: 0.78rem;
  color: var(--text-dim);
}

pre {
  background: #060609;
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.7;
  border: 1px solid var(--border);
  position: relative;
}

pre::before {
  content: 'TERMINAL';
  position: absolute;
  top: 6px; right: 10px;
  font-family: var(--font-hud);
  font-size: 0.6rem;
  color: var(--text-dim);
  opacity: 0.4;
  letter-spacing: 0.1em;
}

code {
  font-family: var(--font-code);
  color: var(--text-bright);
}

.note {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
  font-family: var(--font-code);
  font-size: 0.78rem;
}

/* === Keymap === */
.keymap-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.keymap-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.keymap-group h3 {
  font-size: 0.88rem;
  color: var(--cyan);
  margin-bottom: 12px;
}

.keymap-group p { margin-bottom: 8px; font-size: 0.88rem; }

kbd {
  display: inline-block;
  background: #141822;
  border: 1px solid #222838;
  border-bottom: 2px solid #2a3040;
  border-radius: 4px;
  padding: 2px 7px;
  font-family: var(--font-code);
  font-size: 0.78rem;
  margin: 2px;
  min-width: 24px;
  text-align: center;
  color: var(--green);
  transition: all 0.15s;
}
kbd:hover {
  transform: translateY(-1px);
  border-color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

/* === Support === */
.support-desc {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 32px;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.support-card h3 {
  font-size: 1rem;
  margin-bottom: 18px;
  color: var(--text-bright);
}

.eth-address-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.eth-address {
  font-family: var(--font-code);
  font-size: 0.72rem;
  background: #060609;
  padding: 10px 12px;
  border-radius: 4px;
  word-break: break-all;
  max-width: 320px;
  border: 1px solid var(--border);
  color: var(--cyan);
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.copy-btn:hover {
  border-color: var(--green);
  background: var(--green-glow);
}

.copy-feedback {
  font-size: 0.82rem;
  color: var(--green);
  min-height: 1.2em;
  margin-bottom: 12px;
  font-family: var(--font-hud);
}

#eth-qr {
  border-radius: 6px;
  margin: 0 auto;
  display: block;
}

/* === Footer === */
.footer {
  text-align: center;
  padding: 36px 0;
  border-top: 1px solid var(--border);
  font-family: var(--font-hud);
  font-size: 0.82rem;
}

.footer a { color: var(--text-dim); }
.footer a:hover { color: var(--green); }

.footer-sub {
  font-size: 0.72rem;
  color: #333;
  margin-top: 8px;
  font-family: var(--font-code);
}

/* === Responsive === */
@media (max-width: 700px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 2.2rem; }
  .tagline { font-size: 0.95rem; }
  h2 { font-size: 1.3rem; }
  section { padding: 52px 0; }

  .feature-grid,
  .install-steps,
  .keymap-groups,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .install-card { overflow: hidden; }

  pre { overflow-x: auto; word-break: break-all; font-size: 0.75rem; }

  .install-badge { right: 10px; }

  .eth-address { font-size: 0.65rem; }
}