:root {
  --bg-top: #eef6ff;
  --bg-bottom: #d7e8ff;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-border: rgba(18, 57, 99, 0.12);
  --ink: #15304d;
  --muted: #55708d;
  --accent: #0f766e;
  --accent-strong: #0d9488;
  --shadow: 0 24px 60px rgba(19, 48, 77, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Gill Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.85), transparent 30%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.page {
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 2rem;
}

.hero { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.hero-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-bottom: 0.75rem; padding: 0.45rem 0.8rem;
  border-radius: 999px; text-decoration: none;
  font-size: 0.9rem; font-weight: 700; color: var(--ink);
  background: rgba(255,255,255,0.9); border: 1px solid rgba(21,48,77,0.12);
}
.hero-link:hover { background: white; }

.eyebrow { margin: 0 0 0.35rem; color: var(--accent); font-size: 0.9rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 0.95; }
.intro { max-width: 68ch; margin: 0.6rem 0 0; color: var(--muted); font-size: 1rem; }

.layout { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr); gap: 1rem; }

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.controls { padding: 1.1rem; display: flex; flex-direction: column; gap: 0.75rem; }
.control-group > label { display: block; margin-bottom: 0.35rem; font-weight: 700; font-size: 0.92rem; }

.inline-lbl {
  font-weight: 700; font-size: 0.82rem;
  color: var(--muted); min-width: 1.8rem;
}

.seg-control { display: grid; background: rgba(21,48,77,0.07); border-radius: 14px; padding: 3px; gap: 0; }
.seg-control.cols-2 { grid-template-columns: 1fr 1fr; }
.seg-btn {
  padding: 0.45rem 0.3rem; border: 0; border-radius: 11px;
  font: inherit; font-size: 0.82rem; font-weight: 700;
  color: var(--muted); background: transparent; cursor: pointer;
  text-align: center; line-height: 1.25;
  transition: background 0.15s, color 0.15s;
}
.seg-btn.active { background: white; color: var(--ink); box-shadow: 0 2px 8px rgba(21,48,77,0.12); }

input[type="range"] { width: 100%; accent-color: var(--accent-strong); }
.slider-row { display: flex; align-items: center; gap: 0.4rem; }
.slider-val { font-size: 0.85rem; font-weight: 700; color: var(--ink); min-width: 2.8rem; text-align: right; font-variant-numeric: tabular-nums; }
.slider-unit { font-size: 0.8rem; color: var(--muted); }
.num-input {
  width: 5rem; padding: 0.3rem 0.4rem;
  border: 1.5px solid rgba(21,48,77,0.14); border-radius: 8px;
  background: white; color: var(--ink);
  font: inherit; font-size: 0.95rem;
  text-align: right; font-variant-numeric: tabular-nums;
}
.num-input:focus { outline: 2px solid var(--accent-strong); outline-offset: 1px; }
.num-input::-webkit-outer-spin-button,
.num-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.num-input { -moz-appearance: textfield; }

.vector-toggles { display: flex; flex-direction: column; gap: 0.3rem; }
.vec-btn {
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.42rem 0.65rem;
  border: 1.5px solid rgba(21,48,77,0.14); border-radius: 10px;
  font: inherit; font-size: 0.86rem; font-weight: 700;
  color: var(--muted); background: rgba(255,255,255,0.5);
  cursor: pointer; text-align: left;
  transition: background 0.15s, color 0.15s, opacity 0.15s;
}
.vec-btn.active { background: rgba(255,255,255,0.92); color: var(--ink); }
.vec-btn:not(.active) { opacity: 0.45; }
.vec-dot { width: 11px; height: 11px; border-radius: 50%; flex-shrink: 0; }

.auto-row { display: flex; gap: 0.5rem; }

.play-btn {
  flex: 1; padding: 0.5rem 0.6rem;
  border: 1.5px solid rgba(21,48,77,0.14); border-radius: 10px;
  font: inherit; font-size: 0.86rem; font-weight: 700;
  color: var(--ink); background: rgba(255,255,255,0.92);
  cursor: pointer; transition: background 0.15s, color 0.15s;
}
.play-btn:hover { background: white; }
.play-btn.ghost { color: var(--muted); }
.play-btn.playing { background: var(--accent-strong); color: white; border-color: var(--accent-strong); }

.metal-select {
  width: 100%; padding: 0.5rem 0.6rem;
  border: 1.5px solid rgba(21,48,77,0.14); border-radius: 10px;
  font: inherit; font-size: 0.92rem; font-weight: 700;
  color: var(--ink); background: rgba(255,255,255,0.92); cursor: pointer;
}
.metal-select:focus { outline: 2px solid var(--accent-strong); outline-offset: 1px; }

.spec-card {
  margin-top: 0.25rem;
  padding: 0.65rem 0.75rem;
  background: rgba(21,48,77,0.04);
  border-radius: 12px;
  border: 1px dashed rgba(21,48,77,0.15);
}
.spec-card > label { margin-bottom: 0.4rem; }
.spec-row {
  display: flex; justify-content: space-between; gap: 0.5rem;
  font-size: 0.82rem; color: var(--muted);
  padding: 0.15rem 0;
}
.spec-val { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }

.visual-panel { padding: 0.85rem; }

.canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: #04140e;
  aspect-ratio: 8 / 5;
}
.canvas-wrap.light { background: #f6efdc; }

#ed-canvas { display: block; width: 100%; height: 100%; }

.scene-note {
  position: absolute; left: 14px; bottom: 12px;
  padding: 0.35rem 0.65rem;
  background: rgba(255,255,255,0.85);
  border: 1px solid rgba(21,48,77,0.12);
  border-radius: 10px;
  font-size: 0.75rem; color: var(--muted); font-weight: 600;
  pointer-events: none; margin: 0;
}
.canvas-wrap.light .scene-note { background: rgba(255,255,255,0.92); }

@media (max-width: 960px) {
  .hero { align-items: flex-start; flex-direction: column; }
  .layout { grid-template-columns: 1fr; }
}