/* ── Design tokens ─────────────────────────────────────────────────── */
:root {
  --bg:          #080808;
  --surface-1:   #111111;
  --surface-2:   #181818;
  --surface-3:   #222222;
  --accent:      #ff5e14;
  --accent-dim:  rgba(255, 94, 20, 0.12);
  --accent-glow: rgba(255, 94, 20, 0.35);
  --text-1:      #f0f0f0;
  --text-2:      #9a9a9a;
  --text-3:      #555555;
  --border:      rgba(255,255,255,0.08);
  --border-accent: rgba(255, 94, 20, 0.3);
  --radius:      12px;
  --radius-lg:   20px;
  --font:        'Inter', system-ui, sans-serif;
  --max-w:       1100px;
  --nav-h:       64px;
}

/* ── Reset ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
code {
  font-family: 'Consolas', 'Fira Mono', monospace;
  font-size: 0.875em;
  background: var(--surface-3);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: #0d0d0d;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  font-size: 0.82em;
  line-height: 1.7;
  margin-top: 12px;
}
pre code {
  background: none;
  padding: 0;
  color: #ccc;
}

/* ── Utilities ─────────────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.accent    { color: var(--accent); }

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: none;
  transition: all 0.18s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}
.btn-primary:hover {
  background: #ff7a36;
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text-1);
  border-color: rgba(255,255,255,0.2);
  background: var(--surface-2);
}
.btn-sm { padding: 8px 16px; font-size: 0.84rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* ── Navigation ────────────────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(8,8,8,0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
#nav.scrolled { border-bottom-color: var(--border); }
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-1);
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 4px;
  margin-left: auto;
}
.nav-links a {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-2);
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: var(--text-1); background: var(--surface-2); }
#nav .btn { margin-left: 8px; }

/* ── Hero ──────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: calc(var(--nav-h) + 60px) 24px 80px;
}
#waveform-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 560px;
  flex-shrink: 0;
}
.hero-badge {
  display: inline-block;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 24px;
}
h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-2);
  line-height: 1.65;
  margin-bottom: 36px;
  max-width: 480px;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  justify-content: flex-end;
  padding-left: 60px;
}
.track-diagram {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.04);
}
.track {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}
.track + .track { border-top: 1px solid var(--border); }
.track-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-3);
  width: 80px;
  flex-shrink: 0;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.track-label em {
  display: block;
  font-style: normal;
  color: var(--accent);
  font-size: 0.72rem;
}
.track-waveform { flex: 1; height: 40px; }
.track-waveform svg { width: 100%; height: 100%; }
.track-pan {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  width: 32px;
  flex-shrink: 0;
}
.pan-left { color: var(--text-3); text-align: left; }
.pan-right { color: var(--accent); text-align: right; }
.plugin-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface-3);
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  padding: 10px 16px;
  margin: 8px 0;
}
.plugin-name {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.plugin-dots { display: flex; gap: 5px; }
.plugin-dots span {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--text-3);
}
.plugin-dots span:first-child { background: #ff5f57; }
.plugin-dots span:nth-child(2) { background: #febc2e; }
.plugin-dots span:last-child { background: #28c840; }

/* ── Section shared ────────────────────────────────────────────────── */
section { padding: 100px 0; }
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}
.section-header p {
  color: var(--text-2);
  font-size: 1.05rem;
}
h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

/* ── Problem ───────────────────────────────────────────────────────── */
#problem {
  background: var(--surface-1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.problem-text h2 { margin-bottom: 20px; }
.problem-text p { color: var(--text-2); margin-bottom: 16px; line-height: 1.7; }
.problem-stats { display: flex; flex-direction: column; gap: 32px; }
.stat {
  display: flex;
  flex-direction: column;
  border-left: 3px solid var(--accent);
  padding-left: 20px;
}
.stat-number {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text-1);
}
.stat-number.accent { color: var(--accent); }
.stat-label {
  font-size: 0.85rem;
  color: var(--text-2);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Features ──────────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
  border-color: rgba(255,255,255,0.14);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}
.feature-card--highlight {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, var(--surface-1) 0%, rgba(255,94,20,0.06) 100%);
}
.feature-card--highlight:hover { border-color: rgba(255,94,20,0.5); }
.feature-icon {
  width: 44px; height: 44px;
  background: var(--accent-dim);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  color: var(--accent);
}
.feature-icon svg { width: 22px; height: 22px; }
.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.65;
}
.feature-tag {
  display: inline-block;
  margin-top: 14px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
}

/* ── Signal chain ──────────────────────────────────────────────────── */
#how-it-works { background: var(--surface-1); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.chain {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
  padding: 24px 0;
}
.chain-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 80px;
  text-align: center;
}
.chain-node--source, .chain-node--output {
  border-color: rgba(255,255,255,0.12);
}
.chain-node--accent {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, var(--surface-2), rgba(255,94,20,0.07));
}
.chain-icon { font-size: 1.3rem; line-height: 1; }
.chain-label { font-size: 0.72rem; color: var(--text-2); line-height: 1.4; }
.chain-arrow {
  font-size: 1.1rem;
  color: var(--text-3);
  padding: 0 6px;
}
.chain-split {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.chain-branch {
  display: flex;
  align-items: center;
}
.chain-arrow--merge { color: var(--text-3); }
.chain-note {
  text-align: center;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-3);
  letter-spacing: 0.02em;
}

/* ── Parameters ────────────────────────────────────────────────────── */
.params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.param-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.param-table th {
  text-align: left;
  padding: 8px 12px;
  color: var(--text-3);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}
.param-table td {
  padding: 10px 12px;
  color: var(--text-2);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: top;
}
.param-table td strong { color: var(--text-1); }
.param-table tr:last-child td { border-bottom: none; }
.param-table tr:hover td { background: var(--surface-2); }
.ir-tip {
  margin-top: 20px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 0.85rem;
}
.ir-tip strong {
  display: block;
  margin-bottom: 10px;
  color: var(--text-1);
}
.ir-tip ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ir-tip li {
  color: var(--text-2);
  padding-left: 12px;
  position: relative;
}
.ir-tip li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── Download ──────────────────────────────────────────────────────── */
#download {
  background: radial-gradient(ellipse at 50% 0%, rgba(255,94,20,0.08) 0%, transparent 70%);
  border-top: 1px solid var(--border);
}
.download-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 52px;
}
.download-badge {
  display: inline-block;
  background: rgba(40,200,64,0.12);
  border: 1px solid rgba(40,200,64,0.3);
  color: #4ddb66;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.download-text h2 { margin-bottom: 12px; }
.download-text > p { color: var(--text-2); margin-bottom: 28px; }
.download-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}
.step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-2);
}
.step-num {
  background: var(--accent);
  color: #fff;
  width: 22px; height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.download-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.download-requirements h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 10px;
  margin-top: 24px;
}
.download-requirements h4:first-child { margin-top: 0; }
.download-requirements ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.download-requirements li {
  font-size: 0.88rem;
  color: var(--text-2);
  padding-left: 14px;
  position: relative;
}
.download-requirements li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--text-3);
}

/* ── Footer ────────────────────────────────────────────────────────── */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
}
.footer-copy {
  color: var(--text-3);
  font-size: 0.85rem;
  margin-left: auto;
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--text-2);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--accent); }

/* ── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  #hero { flex-direction: column; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-ctas { justify-content: center; }
  .hero-visual { padding-left: 0; justify-content: center; width: 100%; }
  .problem-grid { grid-template-columns: 1fr; gap: 48px; }
  .problem-stats { flex-direction: row; flex-wrap: wrap; gap: 24px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .params-grid { grid-template-columns: 1fr; }
  .download-box { grid-template-columns: 1fr; gap: 40px; padding: 32px; }
  .nav-links { display: none; }
  .footer-copy { margin-left: 0; }
  .footer-inner { justify-content: center; text-align: center; }
  .footer-links { justify-content: center; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2.4rem; }
  section { padding: 72px 0; }
  .chain { overflow-x: auto; justify-content: flex-start; padding: 16px; }
}