/*
  Projectile Motion Simulator styles
  Tech: Vanilla CSS — responsive, clean, and attractive.
*/

:root {
  --bg: #0b1020;
  --panel: rgba(18, 25, 48, 0.8);
  --panel-border: rgba(255, 255, 255, 0.06);
  --text: #e6e9f0;
  --muted: #a9b1c3;
  --primary: #6aa6ff;
  --primary-700: #4a8bf3;
  --accent: #e9a23b;
  --success: #45d483;
  --danger: #ff647c;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 70% 10%, #1c2448 0%, #0b1020 60%, #050814 100%);
  background-attachment: fixed;
}

.app-header {
  text-align: center;
  padding: 24px 16px 8px;
}
.app-header h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.app-header .sub {
  margin: 8px 0 0 0;
  color: var(--muted);
}

.app {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  padding: 16px;
  max-width: 1400px;
  margin: 0 auto;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.35);
}

.controls { padding: 16px; }

.control-row { margin-bottom: 18px; }
.control-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}
.control-input {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}
.select-row {
  grid-template-columns: 1fr 120px;
}

input[type="range"] {
  width: 100%;
}

input[type="number"], select {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 10px;
  outline: none;
}
input[disabled] {
  opacity: 0.6;
}

output {
  min-width: 70px;
  text-align: right;
  color: var(--muted);
}

.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin: 8px 0 4px;
}
.btn {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  cursor: pointer;
  transition: transform .04s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.15); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn.primary { background: linear-gradient(180deg, var(--primary) 0%, var(--primary-700) 100%); border-color: transparent; }
.btn.ghost { background: transparent; }

.stats {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 12px;
}
.stats .label { color: var(--muted); margin-right: 6px; }

.stage { position: relative; overflow: hidden; }
.stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 12/7;
  border-radius: 14px;
}

.app-footer { text-align: center; color: var(--muted); padding: 12px 16px 32px; }

/* Canvas overlays (sky/ground feel) */
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(800px 600px at 30% 20%, rgba(255,255,255,0.06), rgba(255,255,255,0) 60%);
  pointer-events: none;
  border-radius: 14px;
}

/* Responsive */
@media (max-width: 980px) {
  .app { grid-template-columns: 1fr; }
}