:root {
  --bg0: #d9e3ec;
  --bg1: #eef3f7;
  --ink: #1a2330;
  --muted: #5c6b7a;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-border: rgba(26, 35, 48, 0.1);
  --edge: #7a8fa3;
  --node: #1a2330;
  --node-stroke: #ffffff;
  --node-active: #0d6e6e;
  --accent: #0d6e6e;
  --accent-ink: #ffffff;
  --shadow: 0 10px 30px rgba(26, 35, 48, 0.08);
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --hud-pad-left: 120px;
  --node-r: 11;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: linear-gradient(160deg, var(--bg0) 0%, var(--bg1) 55%, #f7fafc 100%);
  color: var(--ink);
  font-family: var(--font-body);
  overflow: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(rgba(26, 35, 48, 0.045) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: 0.7;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 100dvh;
  position: relative;
}

.hud {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 14px 18px 14px var(--hud-pad-left);
  background: var(--panel);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.tagline {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-left: auto;
}

.stat {
  min-width: 64px;
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--panel-border);
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-top: 1px;
}

.stat-value.clear {
  color: var(--accent);
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid var(--panel-border);
  background: #fff;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn:hover:not(:disabled) {
  border-color: rgba(13, 110, 110, 0.45);
  background: #f3faf9;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover:not(:disabled) {
  background: #0a5a5a;
  border-color: #0a5a5a;
  color: var(--accent-ink);
}

.stage-wrap {
  position: relative;
  z-index: 0;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  touch-action: none;
}

#stage {
  display: block;
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#stage.dragging {
  cursor: grabbing;
}

/* Canvas can composite above position:fixed siblings on mobile WebKit
   regardless of z-index. While the related-projects panel is open,
   pull the canvas out of the compositor entirely. */
body.related-panel-open #stage,
body.related-panel-open .win-banner {
  visibility: hidden;
}

.win-banner {
  position: absolute;
  left: 50%;
  top: 18%;
  transform: translateX(-50%) translateY(0);
  padding: 16px 26px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(13, 110, 110, 0.25);
  box-shadow: 0 16px 40px rgba(26, 35, 48, 0.15);
  text-align: center;
  pointer-events: none;
  animation: win-pop 0.45s ease both;
  z-index: 5;
}

.win-banner strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.win-grade {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.win-grade-letter {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.win-grade-letter[data-grade='A'] {
  color: #0d6e6e;
}

.win-grade-letter[data-grade='B'] {
  color: #1a6b3c;
}

.win-grade-letter[data-grade='C'] {
  color: #8a6d1d;
}

.win-grade-letter[data-grade='D'] {
  color: #b35a1a;
}

.win-grade-letter[data-grade='F'] {
  color: #b83228;
}

.win-grade-detail {
  color: var(--muted);
  font-size: 0.88rem;
}

@keyframes win-pop {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
}

@media (max-width: 720px) {
  :root {
    --hud-pad-left: 100px;
    --node-r: 13;
  }

  .hud {
    padding-top: 12px;
    padding-bottom: 12px;
    gap: 10px;
  }

  .brand h1 {
    font-size: 1.3rem;
  }

  .tagline {
    display: none;
  }

  .stats {
    margin-left: 0;
    width: 100%;
  }

  .stat {
    flex: 1;
    min-width: 0;
  }

  .actions {
    width: 100%;
  }

  .btn {
    flex: 1;
  }
}