:root {
  --bg: #06131f;
  --bg-soft: #10283b;
  --panel: rgba(7, 21, 34, 0.82);
  --panel-strong: rgba(9, 29, 47, 0.94);
  --line: rgba(132, 201, 255, 0.22);
  --text: #ebf6ff;
  --muted: #93abc1;
  --accent: #5dd4ff;
  --accent-2: #ffd166;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(93, 212, 255, 0.18), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(255, 209, 102, 0.14), transparent 22%),
    linear-gradient(180deg, #04101a 0%, #071723 38%, #03111e 100%);
  color: var(--text);
  font-family: "Aptos", "Trebuchet MS", "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
}

.app-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 32px;
  display: grid;
  gap: 18px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

h2,
p,
dl,
dd,
dt {
  margin: 0;
}

button {
  border: 1px solid rgba(115, 178, 215, 0.26);
  border-radius: 14px;
  background: rgba(4, 16, 27, 0.88);
  color: var(--text);
  font: inherit;
}

.selector-panel {
  padding: 16px;
}

.compare-actions {
  margin-top: 14px;
}

.compare-trigger {
  border-radius: 999px;
}

button {
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(93, 212, 255, 0.55);
  background: rgba(9, 30, 44, 0.95);
}

.structure-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.structure-button {
  border-radius: 999px;
  padding: 11px 16px;
  background: rgba(7, 19, 30, 0.82);
}

.structure-button.active {
  border-color: rgba(93, 212, 255, 0.72);
  background: linear-gradient(180deg, rgba(18, 63, 93, 0.95), rgba(8, 29, 45, 0.95));
  box-shadow: inset 0 0 0 1px rgba(172, 228, 255, 0.12);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}

.checkbox input {
  accent-color: var(--accent);
}

.stats {
  display: grid;
  gap: 10px;
}

.stats div {
  display: grid;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid rgba(133, 191, 226, 0.12);
}

.stats dt {
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stats dd {
  font-family: "Consolas", "Liberation Mono", monospace;
  font-size: 0.96rem;
  line-height: 1.5;
}

.viewer-panel {
  padding: 18px;
  background: var(--panel-strong);
}

.viewer-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 0 8px 14px;
}

.viewer-controls button {
  width: auto;
}

.planes-panel {
  display: grid;
  gap: 10px;
  padding: 0 8px 14px;
}

.planes-title {
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.plane-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.plane-button {
  border-radius: 999px;
  padding: 9px 14px;
  background: rgba(7, 19, 30, 0.82);
}

.plane-button.active {
  border-color: rgba(255, 209, 102, 0.7);
  background: linear-gradient(180deg, rgba(98, 74, 20, 0.95), rgba(52, 37, 7, 0.95));
  box-shadow: inset 0 0 0 1px rgba(255, 229, 161, 0.12);
}

.viewer-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  padding: 8px 8px 16px;
}

.viewer-toolbar h2 {
  font-size: clamp(1.4rem, 2.5vw, 2.1rem);
}

h3 {
  margin: 0;
  font-size: 1.1rem;
}

.viewer-toolbar p {
  color: var(--muted);
}

.hint {
  text-align: right;
  font-size: 0.92rem;
}

#viewer {
  display: block;
  width: 100%;
  height: min(68vh, 720px);
  border-radius: 20px;
  border: 1px solid rgba(137, 200, 238, 0.12);
  background:
    radial-gradient(circle at 50% 35%, rgba(21, 76, 112, 0.30), rgba(3, 12, 21, 0.95) 60%),
    linear-gradient(180deg, rgba(7, 25, 40, 0.95), rgba(3, 10, 18, 1));
  cursor: grab;
}

#viewer.dragging {
  cursor: grabbing;
}

.compare-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(3, 10, 18, 0.76);
  backdrop-filter: blur(10px);
  z-index: 30;
}

.compare-modal[hidden] {
  display: none !important;
}

.compare-dialog {
  width: min(1200px, 100%);
  padding: 18px;
  background: rgba(7, 21, 34, 0.96);
}

.compare-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  padding: 8px 8px 16px;
}

.compare-header p {
  margin-top: 6px;
  color: var(--muted);
}

.compare-header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: end;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.compare-card {
  padding: 14px;
  border: 1px solid rgba(137, 200, 238, 0.12);
  border-radius: 22px;
  background: rgba(4, 16, 27, 0.72);
}

.compare-card p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.compare-canvas {
  display: block;
  width: 100%;
  height: 280px;
  margin-top: 12px;
  border-radius: 18px;
  border: 1px solid rgba(137, 200, 238, 0.12);
  background:
    radial-gradient(circle at 50% 35%, rgba(21, 76, 112, 0.30), rgba(3, 12, 21, 0.95) 60%),
    linear-gradient(180deg, rgba(7, 25, 40, 0.95), rgba(3, 10, 18, 1));
  cursor: grab;
}

.compare-canvas.dragging {
  cursor: grabbing;
}

@media (max-width: 900px) {
  .app-shell {
    width: min(100vw - 20px, 1240px);
    padding-top: 12px;
  }

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

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

  .compare-header {
    flex-direction: column;
  }

  .compare-header-actions {
    justify-content: start;
  }

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

  .hint {
    text-align: left;
  }

  #viewer {
    height: 56vh;
  }
}