src/style.css

:root {
  color-scheme: light;
  font-family:
    "Space Grotesk",
    "Avenir Next",
    "Segoe UI",
    sans-serif;
  line-height: 1.5;
  font-weight: 400;
  --paper: #f4f4f2;
  --ink: #171717;
  --muted: #666666;
  --panel: rgba(250, 250, 248, 0.96);
  --panel-strong: #ffffff;
  --border: rgba(23, 23, 23, 0.14);
  --accent: #2a2a2a;
  --accent-strong: #111111;
  --error: #8a1f1f;
  background:
    radial-gradient(circle at top, rgba(0, 0, 0, 0.04), transparent 42%),
    linear-gradient(180deg, #fbfbfa 0%, #f0f0ed 100%);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

html,
body,
#app {
  min-height: 100%;
}

body {
  margin: 0;
}

button,
input {
  font: inherit;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.shell {
  display: grid;
  min-height: 100vh;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 18px;
  padding: 18px;
  align-items: start;
}

.compare-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.06);
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 10px 8px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.05rem, 2.8vw, 3.2rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.lede {
  margin: 0;
  max-width: 30rem;
  color: var(--muted);
}

.status-card {
  display: grid;
  gap: 10px 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-block: 10px 12px;
  border-block: 1px solid var(--border);
}

.status-card > div:last-child {
  grid-column: 1 / -1;
}

.label {
  margin: 0 0 4px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.value,
.status-text {
  margin: 0;
}

.model-picker {
  display: grid;
  gap: 8px;
  padding-block: 4px 10px;
}

.model-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.model-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.dropzone {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 180px;
  padding: 20px;
  border: 1.5px dashed rgba(23, 23, 23, 0.22);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(245, 245, 243, 0.96));
  text-align: center;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.dropzone-active {
  border-color: rgba(23, 23, 23, 0.38);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.07);
}

.dropzone-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.dropzone-copy {
  margin: 0;
  color: var(--muted);
}

.actions {
  display: grid;
  gap: 12px;
}

.button {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 14px 20px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    background 180ms ease;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.button:not(:disabled):hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(180deg, #2a2a2a, #111111);
  color: white;
  border-color: rgba(0, 0, 0, 0.4);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(23, 23, 23, 0.18);
  color: var(--ink);
}

.error-text {
  margin: 0;
  color: var(--error);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-self: start;
  position: sticky;
  top: 18px;
}

.stage {
  display: grid;
  flex: 1;
  place-items: center;
  position: relative;
  overflow: hidden;
  min-height: 360px;
  border-radius: 20px;
  background:
    radial-gradient(circle at center, rgba(0, 0, 0, 0.035), transparent 56%),
    rgba(255, 255, 255, 0.82);
}

.checkerboard {
  background-color: #f7f7f7;
  background-image:
    linear-gradient(45deg, #e6e6e6 25%, transparent 25%),
    linear-gradient(-45deg, #e6e6e6 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e6e6e6 75%),
    linear-gradient(-45deg, transparent 75%, #e6e6e6 75%);
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

.stage img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.compare-panel {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 36px);
  gap: 12px;
  padding: 12px;
}

.compare-stage {
  cursor: col-resize;
  flex: 1;
  min-height: 0;
  user-select: none;
}

.compare-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.compare-divider {
  position: absolute;
  inset-block: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent, rgba(24, 34, 37, 0.8), transparent);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.55),
    0 0 18px rgba(24, 34, 37, 0.24);
}

.compare-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  gap: 4px;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(23, 23, 23, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
  transform: translate(-50%, -50%);
}

.compare-handle span {
  width: 2px;
  height: 14px;
  border-radius: 999px;
  background: rgba(24, 34, 37, 0.72);
}

.stage-badge {
  position: absolute;
  top: 16px;
  display: grid;
  gap: 2px;
  padding: 10px 12px;
  border: 1px solid rgba(23, 23, 23, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
  color: var(--muted);
  font-size: 0.88rem;
}

.stage-badge-left {
  left: 16px;
}

.stage-badge-right {
  right: 16px;
  text-align: right;
}

.stage-badge-title {
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.empty {
  margin: 0;
  max-width: 16rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 1180px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .workspace {
    grid-template-columns: 1fr;
    position: static;
  }

  .compare-panel {
    height: auto;
  }

  .stage {
    min-height: 320px;
  }

  .compare-stage {
    min-height: 380px;
  }
}