:root {
  --bg: #f3efe6;
  --panel: rgba(255, 252, 245, 0.82);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --ink: #1f2937;
  --muted: #5b6473;
  --line: rgba(31, 41, 55, 0.12);
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --shadow: 0 24px 60px rgba(65, 51, 23, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  min-height: 100%;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(249, 115, 22, 0.16), transparent 28%),
    linear-gradient(180deg, #f7f1e7 0%, #efe7da 100%);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
}

body {
  min-height: 100vh;
  overflow: hidden;
}

.shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  height: 100vh;
}

.sidebar {
  padding: 28px 22px;
  border-right: 1px solid var(--line);
  background: rgba(255, 248, 239, 0.72);
  backdrop-filter: blur(14px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.sidebar__head h1,
.toolbar__info h2,
.panel__head h3 {
  margin: 0;
  font-weight: 700;
}

.sidebar__copy,
.muted,
.case-card__description,
.placeholder {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
  color: var(--accent-strong);
}

.case-list {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.case-card {
  width: 100%;
  padding: 14px 15px;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.48);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.case-card:hover {
  transform: translateY(-1px);
  border-color: rgba(15, 118, 110, 0.18);
  background: rgba(255, 255, 255, 0.72);
}

.case-card.is-active {
  border-color: rgba(15, 118, 110, 0.42);
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(255, 255, 255, 0.9));
}

.case-card__title {
  display: block;
  margin-bottom: 6px;
  font-size: 18px;
  font-weight: 700;
}

.case-card__description {
  display: block;
  font-size: 13px;
  line-height: 1.45;
}

.main {
  padding: 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.toolbar,
.meta,
.panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
}

.toolbar__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(17, 94, 89, 0.22);
}

.button--secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: none;
  border: 1px solid rgba(31, 41, 55, 0.08);
}

.meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
  padding: 16px 18px;
}

.meta__item {
  display: grid;
  gap: 6px;
}

.meta__label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.compare-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 18px;
}

.panel {
  padding: 18px;
}

.viewport {
  margin-top: 16px;
}

.stage {
  width: min(100%, 1100px);
  margin: 0 auto;
  aspect-ratio: 16 / 9;
}

.viewport__surface {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 20px;
  overflow: hidden;
  background: var(--panel-strong);
  border: 1px solid rgba(31, 41, 55, 0.08);
}

.viewport__surface--chart {
  min-height: 0;
}

.viewport__surface--image {
  display: grid;
  place-items: center;
  padding: 14px;
  isolation: isolate;
  background:
    linear-gradient(45deg, rgba(15, 23, 42, 0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(15, 23, 42, 0.03) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(15, 23, 42, 0.03) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(15, 23, 42, 0.03) 75%);
  background-size: 28px 28px;
  background-position: 0 0, 0 14px, 14px -14px, -14px 0;
}

#browser-chart {
  width: 100%;
  height: 100%;
}

#engine-image {
  display: none;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 14px;
  box-shadow: 0 14px 38px rgba(15, 23, 42, 0.16);
  background: white;
  transition: opacity 160ms ease, filter 160ms ease;
}

.placeholder {
  text-align: center;
  max-width: 260px;
  line-height: 1.5;
}

.loading-overlay {
  position: absolute;
  inset: 14px;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  border-radius: 14px;
  background: rgba(255, 252, 245, 0.82);
  backdrop-filter: blur(10px);
  z-index: 2;
}

.viewport__surface--image.is-loading #engine-image {
  opacity: 0.24;
  filter: blur(1px);
}

.viewport__surface--image.is-loading .loading-overlay {
  display: flex;
}

.loading-spinner {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 3px solid rgba(15, 118, 110, 0.16);
  border-top-color: var(--accent);
  animation: compare-spin 0.9s linear infinite;
}

.loading-text {
  font-size: 14px;
  color: var(--accent-strong);
  letter-spacing: 0.04em;
}

@keyframes compare-spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

code {
  overflow-wrap: anywhere;
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
}

@media (max-width: 1100px) {
  body {
    overflow: auto;
  }

  .shell {
    grid-template-columns: 1fr;
    height: auto;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow: visible;
  }

  .main {
    overflow: visible;
  }

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

  .toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .stage {
    width: 100%;
  }
}