:root {
  --bg-top: #0f1730;
  --bg-bottom: #111015;
  --panel: rgba(11, 16, 30, 0.86);
  --line: rgba(197, 218, 255, 0.14);
  --text: #f6fbff;
  --soft: #b7c7de;
  --accent: #ff6d6d;
  --sun: #ffe187;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(125, 164, 255, 0.18), transparent 34%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.shell {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 20px;
  min-height: 100vh;
  padding: 20px;
  align-items: start;
}

.sidebar, .main {
  border-radius: 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 22px 70px rgba(0,0,0,0.32);
}

.sidebar { padding: 24px; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--sun);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

h1,h2,p { margin-top: 0; }
h1 { margin-bottom: 12px; font-size: 2.3rem; }
.intro,.card p { color: var(--soft); line-height: 1.55; }

.card {
  margin-top: 18px;
  padding: 16px;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}

.back-link {
  display: inline-block;
  margin-top: 18px;
  color: #95d7ff;
  text-decoration: none;
  font-weight: 700;
}

.main {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.hud > div {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}

.hud span {
  display: block;
  margin-bottom: 6px;
  color: var(--soft);
  font-size: 0.82rem;
}

.canvas-wrap {
  position: relative;
  width: min(100%, 960px);
  min-width: min(100%, 320px);
  margin: 0 auto;
}

canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.08);
  background: #182944;
}

.overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(4, 8, 16, 0.62);
  border-radius: 24px;
}

.overlay.visible { display: flex; }

.overlay-card {
  width: min(540px, 100%);
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(16, 23, 43, 0.98), rgba(9, 12, 24, 0.98));
  border: 1px solid rgba(255, 109, 109, 0.18);
}

.tag {
  color: var(--sun);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.overlay-card p { color: var(--soft); line-height: 1.55; }
.actions { display: flex; gap: 10px; margin-top: 16px; }

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  color: #150d10;
  background: linear-gradient(90deg, #ff8f8f, #fff0f0);
}

.secondary {
  color: var(--text);
  background: rgba(255,255,255,0.08);
}

.hidden { display: none; }

@media (max-width: 1280px) {
  .shell { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .hud { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .shell { padding: 12px; gap: 12px; }
  .sidebar, .main, canvas, .overlay, .overlay-card { border-radius: 18px; }
}