:root {
  color-scheme: light;
  --bg: #f7f4eb;
  --panel: rgba(255, 252, 246, 0.9);
  --text: #181b1e;
  --muted: #5e6570;
  --line: rgba(29, 29, 27, 0.12);
  --shadow: 0 18px 48px rgba(28, 43, 54, 0.14);
  --primary: #2a9d8f;
  --primary-dark: #1f6f66;
  --warm: #d6572f;
  --ink: #12151a;
  --split-pos: 50%;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    linear-gradient(115deg, rgba(42, 157, 143, 0.16), transparent 28%),
    linear-gradient(245deg, rgba(214, 87, 47, 0.14), transparent 24%),
    linear-gradient(180deg, var(--bg), #f2f6f3 58%, #e9edf0 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(circle at center, black 56%, transparent 100%);
}

.page {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  padding: 24px 0 20px;
}

.eyebrow {
  margin: 0 0 10px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary-dark);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  max-width: 13ch;
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.intro {
  max-width: 62ch;
  margin-top: 18px;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--muted);
}

.hero-actions,
.card-header {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 24px;
}

.panel {
  backdrop-filter: blur(14px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease,
    opacity 140ms ease;
}

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

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.button-primary {
  background: var(--primary);
  color: #f7fffb;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  border-color: var(--line);
}

.viewer-card {
  padding: 18px;
}

.viewer-header {
  margin-bottom: 16px;
  align-items: flex-end;
  justify-content: space-between;
}

.status-text {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.5;
}

.comparison-shell {
  display: grid;
  gap: 14px;
}

.comparison-stage {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(26, 26, 26, 0.08), rgba(255, 255, 255, 0.32));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
  touch-action: none;
}

#comparisonCanvas {
  display: block;
  width: 100%;
  height: auto;
}

.split-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split-pos);
  width: 2px;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08);
  pointer-events: none;
}

.split-handle {
  position: absolute;
  top: 50%;
  left: var(--split-pos);
  width: 56px;
  height: 56px;
  transform: translate(-50%, -50%);
  border: none;
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(245, 233, 220, 0.95));
  box-shadow:
    0 10px 30px rgba(19, 14, 10, 0.16),
    inset 0 0 0 1px rgba(29, 29, 27, 0.08);
  cursor: ew-resize;
}

.split-handle::before,
.split-handle::after {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: rgba(29, 29, 27, 0.32);
}

.split-handle::before {
  left: 23px;
}

.split-handle::after {
  right: 23px;
}

.filter-tag {
  position: absolute;
  top: 16px;
  max-width: calc(50% - 28px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 8px 12px;
  border-radius: 999px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  background: rgba(24, 21, 18, 0.72);
  color: #fff5ea;
  backdrop-filter: blur(8px);
}

.filter-tag-left {
  left: 16px;
}

.filter-tag-right {
  right: 16px;
}

.metrics-hud {
  position: absolute;
  right: 16px;
  bottom: 16px;
  max-width: calc(100% - 32px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(18, 21, 26, 0.7);
  color: #eef8f4;
  backdrop-filter: blur(8px);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
}

.split-slider-wrap {
  display: grid;
  gap: 8px;
}

.split-slider-wrap label,
.control label,
.filter-panel-header h2,
.notes h2 {
  font-size: 0.92rem;
  font-weight: 700;
}

.split-slider-wrap input,
.control input,
.control select {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--primary);
}

.preset-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.preset-button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(29, 29, 27, 0.1);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.8), rgba(243, 247, 246, 0.78));
  color: var(--ink);
  box-shadow: 0 10px 24px rgba(28, 43, 54, 0.08);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
}

.preset-button:hover {
  transform: translateY(-1px);
  border-color: rgba(42, 157, 143, 0.38);
  box-shadow: 0 14px 30px rgba(42, 157, 143, 0.14);
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.filter-panel {
  padding: 18px;
  display: grid;
  gap: 14px;
}

.filter-panel-header {
  display: grid;
  gap: 6px;
}

.filter-panel-header p,
.notes p {
  color: var(--muted);
  line-height: 1.6;
}

.auto-note {
  min-height: 3.4em;
  margin: 0;
  padding: 12px 14px;
  border: 1px dashed rgba(29, 29, 27, 0.16);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.46);
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  line-height: 1.5;
}

.control {
  display: grid;
  gap: 8px;
}

.control output {
  font-family: "IBM Plex Mono", monospace;
  color: var(--muted);
}

.control select,
.control input[type="range"] {
  min-height: 42px;
}

.control select {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.74);
  font: inherit;
}

.control.is-disabled {
  opacity: 0.46;
}

.notes {
  margin-top: 20px;
  padding: 20px;
}

code,
pre {
  font-family: "IBM Plex Mono", monospace;
}

pre {
  overflow-x: auto;
  margin: 16px 0 0;
  padding: 16px;
  border-radius: 18px;
  background: #221a15;
  color: #fff3e8;
}

@media (max-width: 900px) {
  .page {
    width: min(100% - 20px, 1240px);
    padding-top: 24px;
  }

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

  .filter-tag {
    top: auto;
    bottom: 16px;
  }

  .metrics-hud {
    position: static;
    margin: 10px;
    white-space: normal;
  }
}