:root {
  --bg:        #0a0a0b;
  --surface:   #111113;
  --border:    #1e1e22;
  --gold:      #c9a84c;
  --gold-dim:  #7a6130;
  --text:      #e8e4dc;
  --muted:     #666055;
  --error:     #c0392b;
  --success:   #2ecc71;
  --radius:    4px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Grain overlay ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
  opacity: 0.4;
}

/* ── Waveform ── */
.waveform-bg {
  position: fixed;
  right: -100px;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 300px;
  opacity: 0.04;
  pointer-events: none;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 3rem;
  border-bottom: 1px solid var(--border);
}

.logo { display: flex; align-items: baseline; gap: 0.5rem; }

.logo-track {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.logo-polisher {
  font-family: 'DM Serif Display', serif;
  font-style: italic;
  font-size: 1.4rem;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.badge {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-left: 2rem;
  transition: color 0.2s;
}
nav a:hover { color: var(--text); }

nav a.nav-sister {
  color: var(--gold-dim);
  border: 1px solid var(--border);
  padding: 0.3rem 0.7rem;
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
}
nav a.nav-sister:hover { color: var(--gold); border-color: var(--gold-dim); }

/* ── Hero ── */
.hero { padding: 6rem 3rem 4rem; max-width: 900px; }

.hero-eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.hero-eyebrow::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--gold);
}

h1 {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 1.5rem;
}
h1 em { font-style: italic; color: var(--gold); }

.hero-sub {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 480px;
  line-height: 1.8;
}

/* ── Divider ── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, var(--gold-dim) 0%, var(--border) 60%, transparent 100%);
  margin: 0 3rem;
  width: calc(100% - 6rem);
}

/* ── Panel ── */
.panel {
  margin: 4rem 3rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 700px;
}

.panel-header {
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.panel-title { font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--muted); }
.panel-step  { font-size: 0.65rem; color: var(--gold-dim); letter-spacing: 0.1em; }

.panel-body { padding: 2rem 1.75rem; }

/* ── Drop zone ── */
.drop-zone {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--gold-dim);
  background: rgba(201,168,76,0.03);
}
.drop-zone input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.drop-icon      { width: 40px; height: 40px; margin: 0 auto 1rem; opacity: 0.3; }
.drop-primary   { font-size: 0.85rem; color: var(--text); margin-bottom: 0.4rem; }
.drop-secondary { font-size: 0.75rem; color: var(--muted); }
.drop-filename  { display: none; font-size: 0.8rem; color: var(--gold); margin-top: 0.75rem; font-style: italic; }

/* ── Presets ── */
.preset-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin-top: 1.5rem; }

.preset-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 0.75rem;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, background 0.2s;
}
.preset-btn:hover  { border-color: var(--gold-dim); background: rgba(201,168,76,0.03); }
.preset-btn.active { border-color: var(--gold); background: rgba(201,168,76,0.06); }

.preset-name { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text); margin-bottom: 0.3rem; }
.preset-desc { font-size: 0.65rem; color: var(--muted); line-height: 1.5; }
.preset-lufs { font-size: 0.65rem; color: var(--gold-dim); margin-top: 0.4rem; }

/* ── Submit ── */
.submit-btn {
  margin-top: 1.5rem;
  width: 100%;
  padding: 1rem;
  background: var(--gold);
  color: var(--bg);
  border: none;
  border-radius: var(--radius);
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  font-weight: 500;
}
.submit-btn:hover    { background: #d4b05a; }
.submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.price-note { margin-top: 1rem; text-align: center; font-size: 0.7rem; color: var(--muted); }
.price-note strong { color: var(--text); }

/* ── Alerts ── */
.alert { padding: 0.75rem 1rem; border-radius: var(--radius); font-size: 0.75rem; margin-bottom: 1rem; display: none; }
.alert.error   { background: rgba(192,57,43,0.1); border: 1px solid rgba(192,57,43,0.3); color: #e74c3c; display: block; }
.alert.success { background: rgba(46,204,113,0.1); border: 1px solid rgba(46,204,113,0.3); color: #2ecc71; display: block; }

/* ── Status ── */
.status-panel { display: none; padding: 1.5rem 1.75rem; border-top: 1px solid var(--border); }
.status-panel.visible { display: block; }

.status-line { display: flex; align-items: center; gap: 0.75rem; font-size: 0.75rem; color: var(--muted); }
.status-dot  { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); flex-shrink: 0; }
.status-dot.processing { background: var(--gold); animation: pulse 1.5s infinite; }
.status-dot.done       { background: var(--success); }
.status-dot.error      { background: var(--error); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

.download-btn {
  display: inline-block;
  margin-top: 1rem;
  width: 100%;
  padding: 1rem;
  background: var(--gold);
  border: none;
  border-radius: var(--radius);
  color: var(--bg);
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background 0.2s;
}
.download-btn:hover { background: #d4b05a; }

/* ── Features ── */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 2rem 3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 700px;
}
.feature { padding: 1.75rem 1.5rem; border-right: 1px solid var(--border); }
.feature:last-child { border-right: none; }
.feature-icon  { font-size: 1.2rem; margin-bottom: 0.75rem; display: block; }
.feature-title { font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text); margin-bottom: 0.5rem; }
.feature-desc  { font-size: 0.7rem; color: var(--muted); line-height: 1.7; }

/* ── Sister service banner ── */
.sister-banner {
  margin: 2rem 3rem 4rem;
  max-width: 700px;
  border: 1px solid var(--gold-dim);
  border-radius: var(--radius);
  background: rgba(201,168,76,0.04);
  padding: 1.5rem 1.75rem;
}

.sister-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.sister-label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: 0.3rem;
}

.sister-title {
  font-size: 0.8rem;
  color: var(--text);
}

.sister-btn {
  flex-shrink: 0;
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--gold-dim);
  border-radius: var(--radius);
  color: var(--gold);
  text-decoration: none;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.sister-btn:hover { background: var(--gold); color: var(--bg); border-color: var(--gold); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-left  { font-size: 0.7rem; color: var(--muted); line-height: 1.8; }
.footer-right { font-size: 0.7rem; color: var(--muted); text-align: right; display: flex; align-items: center; gap: 0.5rem; }
.footer-right a { color: var(--muted); text-decoration: none; }
.footer-right a:hover { color: var(--text); }

/* ── Responsive ── */
@media (max-width: 640px) {
  header { padding: 1.5rem; }
  nav a.nav-sister { display: none; }
  .hero  { padding: 3rem 1.5rem 2rem; }
  .panel, .features, .sister-banner { margin: 2rem 1.5rem; }
  .divider { margin: 0 1.5rem; width: calc(100% - 3rem); }
  .features { grid-template-columns: 1fr; }
  .feature  { border-right: none; border-bottom: 1px solid var(--border); }
  .feature:last-child { border-bottom: none; }
  .preset-row { grid-template-columns: 1fr; }
  .sister-inner { flex-direction: column; align-items: flex-start; }
  footer { flex-direction: column; gap: 1rem; }
}