/* ─── INDEX PAGE STYLES ─────────────────────────────────────── */

/* HERO */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-radial {
  position: absolute;
  width: 900px;
  height: 900px;
  background: radial-gradient(circle, rgba(0,230,200,0.08) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.hero-radial-2 {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(10,132,255,0.06) 0%, transparent 70%);
  top: 20%;
  right: -10%;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 6rem;
}

.hero-badge {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.hero-title .accent { color: var(--cyan); }
.hero-title .outline {
  -webkit-text-stroke: 2px var(--text-3);
  color: transparent;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-2);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-meta-item .dot {
  width: 4px;
  height: 4px;
  background: var(--cyan);
  border-radius: 50%;
}

.hero-meta-item span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
  letter-spacing: 0.08em;
}

/* DEMO PANEL */
.hero-demo {
  position: relative;
  z-index: 2;
}

.demo-panel {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 60px rgba(0,230,200,0.05);
}

.demo-panel-bar {
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.demo-dot { width: 10px; height: 10px; border-radius: 50%; }
.demo-dot-r { background: #ff5f57; }
.demo-dot-y { background: #febc2e; }
.demo-dot-g { background: #28c840; }

.demo-url {
  margin-left: auto;
  margin-right: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  background: var(--bg-2);
  padding: 0.25rem 1rem;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.demo-body { padding: 1.5rem; }

/* Upload zone */
.upload-zone {
  border: 2px dashed var(--border-2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--cyan);
  background: var(--cyan-dim);
}

.upload-zone-icon {
  width: 56px;
  height: 56px;
  background: var(--cyan-dim);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  border: 1px solid rgba(0,230,200,0.3);
}

.upload-zone-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--cyan);
  fill: none;
  stroke-width: 1.5;
}

.upload-zone h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.upload-zone p {
  font-size: 0.78rem;
  color: var(--text-3);
  font-family: var(--font-mono);
}

.upload-zone input { display: none; }

/* Result display */
.demo-result {
  display: none;
  margin-top: 1rem;
}
.demo-result.visible { display: block; }

.result-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-top: 1rem;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.result-verdict {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
}
.result-verdict.ai { color: var(--magenta); }
.result-verdict.real { color: var(--cyan); }

.confidence-bar-wrap {
  margin-bottom: 1rem;
}
.confidence-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-3);
  margin-bottom: 0.4rem;
}
.confidence-bar {
  height: 4px;
  background: var(--surface-2);
  border-radius: 2px;
  overflow: hidden;
}
.confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transition: width 1s cubic-bezier(0.4,0,0.2,1);
}

/* Signal meters */
.signal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.signal-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-3);
}
.signal-score {
  font-weight: 700;
  color: var(--text);
}

/* Spectrogram preview */
.spectrogram-preview {
  margin-top: 1rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

#spectrogram-canvas {
  display: block;
  width: 100%;
}

/* Analyzing state */
.analyzing-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(5,8,16,0.85);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  border-radius: var(--radius-lg);
  z-index: 10;
}
.analyzing-overlay.active { display: flex; }

.spinner {
  width: 44px;
  height: 44px;
  border: 2px solid var(--surface-2);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.analyzing-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

/* STATS BAR */
.stats-bar {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-item .stat-number {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.3rem;
}

.stat-item p {
  font-size: 0.78rem;
  color: var(--text-3);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* HOW IT WORKS */
.how-it-works { position: relative; overflow: hidden; }

.steps-list { counter-reset: steps; }

.step-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  align-items: start;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}
.step-item:last-child { border-bottom: none; }

.step-number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  letter-spacing: 0.15em;
  padding-top: 0.3rem;
}

.step-num-big {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  -webkit-text-stroke: 1px var(--border-2);
  color: transparent;
  line-height: 1;
}

.step-content h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.step-content p {
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.step-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.step-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--bg-2);
  color: var(--text-3);
  border: 1px solid var(--border);
}

/* FEATURES */
.features { background: var(--bg-1); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover::before { opacity: 1; }
.feature-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--cyan-dim);
  border: 1px solid rgba(0,230,200,0.25);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--cyan);
  fill: none;
  stroke-width: 1.5;
}

.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* FFT VIZ */
.fft-section { position: relative; }

.fft-visual {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 40px 80px rgba(0,0,0,0.4);
}

.fft-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  background: var(--surface-2);
}

.fft-tab {
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.fft-tab:hover { color: var(--text-2); }
.fft-tab.active { color: var(--cyan); border-bottom-color: var(--cyan); }

.fft-canvas-wrap {
  padding: 1.5rem;
  position: relative;
}

#fft-canvas {
  display: block;
  width: 100%;
  height: 220px;
  border-radius: var(--radius);
}

.fft-legend {
  display: flex;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-3);
}
.legend-dot { width: 8px; height: 8px; border-radius: 50%; }

/* CTA SECTION */
.cta-section {
  position: relative;
  overflow: hidden;
  background: var(--bg-1);
}

.cta-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,230,200,0.08) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1.25rem;
}

.cta-inner p {
  color: var(--text-2);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 2.5rem;
}

/* HERO GRID */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-demo { display: none; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .step-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .signal-grid { grid-template-columns: 1fr; }
}