:root {
  --bg: #f7f5f0;
  --bg-grid: rgba(23, 21, 18, 0.022);
  --surface: #ffffff;
  --surface-alt: #f4f1ea;
  --surface-soft: #faf8f4;
  --border: #ddd7cb;
  --border-strong: #c6bdaf;
  --text: #171512;
  --muted: #615b52;
  --accent: #171512;
  --shadow-sm: 0 12px 30px rgba(23, 21, 18, 0.05);
  --shadow-md: 0 18px 40px rgba(23, 21, 18, 0.08);
  --radius-xl: 20px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --font-serif: "KaTeX_Main", "Latin Modern Roman", "CMU Serif", "Computer Modern Serif", "Times New Roman", serif;
  --transition: 180ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-serif);
  color: var(--text);
  background:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px),
    var(--bg);
  background-size: 24px 24px, 24px 24px, auto;
  line-height: 1.65;
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

button {
  appearance: none;
}

.page-shell {
  width: min(1440px, calc(100% - 56px));
  margin: 0 auto;
  padding: 34px 0 56px;
}

.hero,
.control-panel,
.model-card,
.cutoff-section {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.hero {
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  margin: 0 0 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--muted);
}

.hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.7rem, 4vw, 4.5rem);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.hero-copy {
  margin: 14px 0 0;
  max-width: 880px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.78;
}

.control-panel {
  display: grid;
  gap: 0;
  padding: 18px 22px;
  margin-bottom: 24px;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(221, 215, 203, 0.95);
  box-shadow: var(--shadow-sm);
}

.control-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.control-row + .control-row {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.control-inline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 18px;
  min-width: 0;
}

.control-row-stack {
  align-items: flex-start;
}

.control-row-stack .control-label {
  padding-top: 8px;
  min-width: 72px;
}

.control-label {
  flex: 0 0 auto;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 15px;
  cursor: pointer;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    box-shadow var(--transition),
    color var(--transition);
}

.chip:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: var(--surface);
  box-shadow: 0 8px 18px rgba(23, 21, 18, 0.06);
}

.chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 12px 24px rgba(23, 21, 18, 0.16);
}

.chip-group-static .chip {
  background: var(--surface-soft);
  color: var(--muted);
}

.chip.is-static {
  cursor: default;
}

.chip.is-static:hover {
  transform: none;
  border-color: var(--border);
  background: var(--surface-soft);
  box-shadow: none;
}

.toolbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.secondary-button {
  border-radius: 999px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #ffffff 0%, #f8f5ef 100%);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(23, 21, 18, 0.045);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

.secondary-button:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  box-shadow: 0 14px 28px rgba(23, 21, 18, 0.08);
}

.comparison-grid {
  display: block;
}

.comparison-stack {
  display: grid;
  gap: 22px;
}

.cutoff-section {
  padding: 20px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, #ffffff 0%, #fcfbf8 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.cutoff-section:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.cutoff-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.section-kicker {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  color: var(--muted);
}

.cutoff-header h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.42rem;
  font-weight: 400;
  line-height: 1.25;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}

.model-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff 0%, #fdfcf9 100%);
  border: 1px solid var(--border);
  box-shadow: 0 6px 18px rgba(23, 21, 18, 0.03);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

.model-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 36px rgba(23, 21, 18, 0.09);
}

.model-card.is-highlight {
  border-color: var(--border-strong);
  background: linear-gradient(180deg, #fffdfa 0%, #f8f4ec 100%);
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}

.card-kicker {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  color: var(--muted);
}

.card-title {
  margin: 0;
  font-size: 1.4rem;
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.2;
}

.card-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.pill {
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.model-card:hover .pill {
  background: var(--surface-soft);
  border-color: var(--border-strong);
  color: var(--text);
}

.spectrogram-frame {
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(23, 21, 18, 0.12);
  background: #101010;
}

.spectrogram-image {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  transform: scale(1);
  transition: transform 260ms ease, opacity var(--transition), filter var(--transition);
}

.model-card:hover .spectrogram-image {
  transform: scale(1.015);
  filter: saturate(1.03) contrast(1.02);
}

.audio-section {
  padding-top: 2px;
}

.audio-section audio {
  width: 100%;
  filter: sepia(0.12) saturate(0.88);
}

.loading,
.empty-state {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 1080px) {
  .control-row,
  .control-inline,
  .card-top,
  .cutoff-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .toolbar-actions {
    margin-left: 0;
  }

  .card-pills {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 20px, 100%);
    padding-top: 20px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .control-panel,
  .cutoff-section {
    padding: 16px;
  }

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