:root {
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-card: #161616;
  --fg: #e8e4df;
  --fg-muted: #7a7571;
  --fg-dim: #4a4744;
  --accent: #ff3d00;
  --accent-glow: rgba(255, 61, 0, 0.15);
  --accent-secondary: #ff6b35;
  --border: #2a2725;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Space Grotesk', -apple-system, sans-serif;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.6;
  overflow-x: hidden;
}

.accent {
  color: var(--accent);
}

/* ==================== HERO ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-noise {
  position: absolute;
  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='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 2rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  background: var(--accent-glow);
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

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

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  max-width: 600px;
  line-height: 1.7;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
}

.stat-val {
  display: block;
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--fg);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-waveform {
  position: absolute;
  right: 2rem;
  bottom: 4rem;
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 200px;
  opacity: 0.15;
}

.wave-bar {
  width: 6px;
  height: var(--h);
  background: var(--accent);
  animation: waveMove 3s ease-in-out infinite;
  animation-delay: calc(var(--h) * 0.01s);
}

@keyframes waveMove {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.6); }
}

/* ==================== PROCESS ==================== */
.process {
  padding: 6rem 2rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.process-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.label-num {
  color: var(--accent);
  font-weight: 600;
}

.process h2, .outputs h2, .battle h2, .closing h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
}

.process-step {
  background: var(--bg);
  padding: 2rem 1.5rem;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.step-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

.step-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.process-step h3 {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--fg);
  margin-bottom: 0.75rem;
}

.process-step p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ==================== OUTPUTS ==================== */
.outputs {
  padding: 6rem 2rem;
  background: var(--bg-elevated);
}

.outputs-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.output-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
}

.output-card {
  background: var(--bg-elevated);
  padding: 2.5rem 2rem;
  transition: background 0.3s;
}

.output-card:hover {
  background: var(--bg-card);
}

.card-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.card-spec {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.output-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--fg);
}

.output-card p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ==================== BATTLE ==================== */
.battle {
  padding: 6rem 2rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.battle-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.battle-desc {
  font-size: 1.05rem;
  color: var(--fg-muted);
  max-width: 600px;
  margin: 0 auto 3rem;
  line-height: 1.7;
}

.battle-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 2.5rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.battle-side {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.battle-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--fg-dim);
  margin-bottom: 0.5rem;
}

.b-bar {
  height: 8px;
  width: var(--w);
  background: var(--accent);
  opacity: 0.7;
  transition: width 0.5s;
}

.battle-side.left .b-bar {
  margin-left: auto;
}

.battle-vs {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  padding: 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}

/* ==================== CLOSING ==================== */
.closing {
  position: relative;
  padding: 8rem 2rem;
  background: var(--bg-elevated);
  text-align: center;
  overflow: hidden;
}

.closing-inner {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.closing-glitch {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 40%, transparent 60%, var(--accent-glow) 100%);
  pointer-events: none;
}

.closing h2 {
  margin-bottom: 1.5rem;
}

.closing-sub {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ==================== FOOTER ==================== */
.site-footer {
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
}

.footer-tagline {
  font-size: 0.8rem;
  color: var(--fg-dim);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .hero {
    padding: 4rem 1.5rem 3rem;
    min-height: auto;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .stat-divider {
    width: 40px;
    height: 1px;
  }

  .hero-waveform {
    display: none;
  }

  .process-grid {
    grid-template-columns: 1fr;
  }

  .output-grid {
    grid-template-columns: 1fr;
  }

  .battle-visual {
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .battle-side.left .b-bar {
    margin-left: 0;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  .process, .outputs, .battle, .closing {
    padding: 4rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .process h2, .outputs h2, .battle h2, .closing h2 {
    font-size: 1.6rem;
  }
}

/* ==================== UPLOAD ZONE ==================== */
.upload-zone {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  margin: 2rem 0;
  max-width: 560px;
  transition: border-color 0.2s;
}

.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.upload-idle {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 2rem;
  gap: 0.5rem;
  cursor: default;
}

.upload-icon {
  margin-bottom: 0.5rem;
}

.upload-hint {
  font-size: 1rem;
  color: var(--fg);
  font-weight: 500;
}

.upload-or {
  font-size: 0.8rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.upload-btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.upload-btn:hover {
  background: var(--accent);
  color: var(--bg);
}

.upload-spec {
  font-size: 0.75rem;
  color: var(--fg-dim);
  font-family: var(--mono);
  margin-top: 0.5rem;
}

/* Loading state */
.upload-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 2rem;
  gap: 1.5rem;
}

.loader-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 40px;
}

.loader-bars span {
  display: block;
  width: 5px;
  height: 20px;
  background: var(--accent);
  animation: loaderPulse 1.2s ease-in-out infinite;
}

.loader-bars span:nth-child(1)  { animation-delay: 0s; }
.loader-bars span:nth-child(2)  { animation-delay: 0.12s; }
.loader-bars span:nth-child(3)  { animation-delay: 0.24s; }
.loader-bars span:nth-child(4)  { animation-delay: 0.36s; }
.loader-bars span:nth-child(5)  { animation-delay: 0.48s; }
.loader-bars span:nth-child(6)  { animation-delay: 0.6s; }
.loader-bars span:nth-child(7)  { animation-delay: 0.72s; }
.loader-bars span:nth-child(8)  { animation-delay: 0.84s; }
.loader-bars span:nth-child(9)  { animation-delay: 0.96s; }
.loader-bars span:nth-child(10) { animation-delay: 1.08s; }

@keyframes loaderPulse {
  0%, 100% { transform: scaleY(0.4); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

.loader-status {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
}

/* ==================== RESULT PANEL ==================== */
.result-panel {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  margin: 2rem 0;
  max-width: 700px;
  align-items: start;
}

.result-cover-wrap {
  position: relative;
}

.result-cover {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border: 1px solid var(--border);
}

.result-download {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding: 0.6rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: border-color 0.2s, color 0.2s;
}

.result-download:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.result-tag {
  padding: 0.3rem 0.75rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--border);
}

.result-tag--mood { color: var(--accent); border-color: var(--accent); background: var(--accent-glow); }
.result-tag--genre { color: var(--fg-muted); }
.result-tag--energy { color: var(--fg-dim); }

.result-features {
  display: flex;
  gap: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.result-metric {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-key {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  text-transform: uppercase;
}

.metric-val {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--fg);
}

.result-prompt-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.result-prompt {
  font-size: 0.82rem;
  color: var(--fg-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.upload-again-btn {
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--border);
  background: none;
  color: var(--fg-muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.upload-again-btn:hover {
  border-color: var(--fg-muted);
  color: var(--fg);
}

@media (max-width: 640px) {
  .result-panel {
    grid-template-columns: 1fr;
  }

  .result-cover-wrap {
    max-width: 280px;
  }

  .upload-zone {
    max-width: 100%;
  }
}

/* ==================== BATTLE SECTION (landing page) ==================== */
.battle {
  padding: 6rem 2rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.battle-inner {
  max-width: 700px;
  margin: 0 auto;
}

.battle h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.battle-desc {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 560px;
}

.battle-visual {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.battle-side {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.25rem;
  border-radius: 2px;
}

.battle-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.battle-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.b-bar {
  height: 6px;
  width: var(--w, 60%);
  background: var(--accent);
  border-radius: 1px;
  opacity: 0.6;
}

.battle-side.right .b-bar {
  background: #0096ff;
  opacity: 0.5;
}

.battle-vs {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg-dim);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.battle-cta-btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: #fff;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-decoration: none;
  border-radius: 3px;
  transition: background 0.15s, transform 0.15s;
}

.battle-cta-btn:hover {
  background: #e03500;
  transform: translateY(-1px);
}