/* styles.css — 1980s CRT terminal aesthetic for the three-body simulator. */

:root {
  --green: #4dff88;
  --green-dim: #2f8d56;
  --amber: #ffc24d;
  --cyan: #6fe0ff;
  --blue: #5b8cff;
  --bg: #02040a;
  --panel-bg: rgba(2, 12, 8, 0.82);
  --line: rgba(77, 255, 136, 0.28);
  --line-soft: rgba(77, 255, 136, 0.14);
  --glow: 0 0 6px rgba(77, 255, 136, 0.55);
  --mono: 'Share Tech Mono', ui-monospace, 'Cascadia Mono', Consolas, monospace;
  --display: 'VT323', var(--mono);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--green);
  font-family: var(--mono);
  overflow: hidden;
  -webkit-font-smoothing: none;
}

#scene {
  position: fixed;
  inset: 0;
  z-index: 0;
}
#scene canvas { display: block; }

/* global scanlines + faint flicker, drawn over everything but the controls */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.07) 3px,
    rgba(0, 0, 0, 0.07) 3px
  );
  mix-blend-mode: multiply;
}

/* ---------- top bar ---------- */
#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(to bottom, rgba(2, 12, 8, 0.85), rgba(2, 12, 8, 0));
  text-transform: uppercase;
  letter-spacing: 2px;
  user-select: none;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--display);
  font-size: 26px;
  text-shadow: var(--glow);
}
.brand-mark { color: var(--amber); text-shadow: 0 0 8px rgba(255, 194, 77, 0.6); }
.brand-ver { color: var(--green-dim); font-size: 16px; letter-spacing: 1px; }
.topstats { display: flex; gap: 18px; font-size: 14px; }
.stat { color: var(--cyan); text-shadow: 0 0 5px rgba(111, 224, 255, 0.4); }
.status {
  color: var(--amber);
  border: 1px solid var(--amber);
  padding: 2px 10px;
  text-shadow: 0 0 6px rgba(255, 194, 77, 0.5);
}
.status.on {
  color: var(--green);
  border-color: var(--green);
  text-shadow: var(--glow);
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0.55; } }

/* ---------- control panel ---------- */
#panel {
  position: fixed;
  top: 52px;
  right: 0;
  bottom: 0;
  z-index: 10;
  width: 320px;
  max-width: 88vw;
  padding: 14px 16px 28px;
  overflow-y: auto;
  background: var(--panel-bg);
  border-left: 1px solid var(--line);
  backdrop-filter: blur(2px);
  transition: transform 0.25s ease;
}
body.panel-hidden #panel { transform: translateX(100%); }

#panel::-webkit-scrollbar { width: 8px; }
#panel::-webkit-scrollbar-thumb { background: var(--line); }

.section { margin-bottom: 18px; }
.section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--green-dim);
  border-bottom: 1px dashed var(--line-soft);
  padding-bottom: 4px;
  margin-bottom: 10px;
  cursor: pointer;
  user-select: none;
}
.section-title:hover { color: var(--green); }
.section-arrow {
  color: var(--amber);
  font-size: 10px;
  transition: transform 0.15s ease;
}
.section.collapsed .section-arrow { transform: rotate(-90deg); }
.section.collapsed .section-body { display: none; }

/* buttons */
.btn-row { display: flex; gap: 6px; flex-wrap: wrap; }
.btn-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.btn-grid.three { grid-template-columns: repeat(3, 1fr); }
.btn {
  flex: 1 1 auto;
  min-width: 0;
  padding: 7px 9px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--green);
  background: rgba(77, 255, 136, 0.05);
  border: 1px solid var(--line);
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.12s, box-shadow 0.12s, color 0.12s;
}
.btn:hover { background: rgba(77, 255, 136, 0.16); box-shadow: var(--glow); }
.btn:active { transform: translateY(1px); }
.btn.active {
  color: var(--bg);
  background: var(--green);
  box-shadow: var(--glow);
  text-shadow: none;
}
.btn-primary { color: var(--amber); border-color: var(--amber); }
.btn-primary:hover { background: rgba(255, 194, 77, 0.16); box-shadow: 0 0 6px rgba(255, 194, 77, 0.55); }

/* sliders */
.slider { display: block; margin: 9px 0; }
.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 3px;
  text-transform: uppercase;
}
.slider-val { color: var(--cyan); }
input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: var(--line);
  outline: none;
  cursor: pointer;
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 16px;
  background: var(--green);
  box-shadow: var(--glow);
  border: none;
  border-radius: 0;
}
input[type='range']::-moz-range-thumb {
  width: 12px; height: 16px; border: none; border-radius: 0;
  background: var(--green); box-shadow: var(--glow);
}

/* toggles */
.tgl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 10px; }
/* space a button row away from a preceding toggle grid (e.g. CAMERA: follow COM / FRAME ALL) */
.tgl-grid + .btn-row { margin-top: 14px; }
.tgl {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 1px;
  cursor: pointer;
  text-transform: uppercase;
  user-select: none;
}
.tgl input { display: none; }
.tgl-box {
  width: 14px; height: 14px;
  border: 1px solid var(--line);
  flex: 0 0 auto;
  position: relative;
}
.tgl input:checked + .tgl-box {
  background: var(--green);
  box-shadow: var(--glow);
}

/* custom bodies */
.custom { margin-bottom: 18px; }
.custom.hidden { display: none; }
.custom-body {
  border: 1px solid var(--line-soft);
  padding: 8px 10px;
  margin-bottom: 10px;
}
.custom-body-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: 2px; color: var(--amber);
  margin-bottom: 6px;
}
.swatch { width: 10px; height: 10px; box-shadow: 0 0 6px currentColor; display: inline-block; }
.custom-body .slider { margin: 5px 0; }

/* save / load: export confirm form */
.io-form { margin-top: 8px; }
.io-form.hidden { display: none; }
.io-name-label {
  display: block;
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--green-dim);
  margin-bottom: 4px;
}
.io-name {
  width: 100%;
  margin-bottom: 6px;
  padding: 6px 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--green);
  background: rgba(77, 255, 136, 0.05);
  border: 1px solid var(--line);
  outline: none;
}
.io-name:focus { border-color: var(--green); box-shadow: var(--glow); }
.io-name::selection { background: var(--green); color: var(--bg); }

/* save / load status line */
.io-status {
  min-height: 14px;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 1px;
  line-height: 1.4;
  color: var(--cyan);
  text-shadow: 0 0 5px rgba(111, 224, 255, 0.4);
  word-break: break-word;
}
.io-status.error { color: #ff5d5d; text-shadow: 0 0 6px rgba(255, 93, 93, 0.5); }

/* telemetry */
.ro-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  font-size: 13px;
  margin-bottom: 8px;
}
.ro-label { color: var(--green-dim); text-transform: uppercase; letter-spacing: 1px; }
.ro-val { color: var(--cyan); text-align: right; }
.ro-val.warn { color: #ff5d5d; text-shadow: 0 0 6px rgba(255, 93, 93, 0.5); }
.ro-sub { font-size: 11px; color: var(--green-dim); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 4px; }
.bars { display: flex; flex-direction: column; gap: 5px; }
.bar-row { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.bar-label { width: 12px; color: var(--amber); }
.bar-track { flex: 1; height: 8px; background: var(--line-soft); border: 1px solid var(--line-soft); }
.bar-fill { display: block; height: 100%; box-shadow: 0 0 6px currentColor; transition: width 0.1s linear; }
.bar-val { width: 44px; text-align: right; color: var(--cyan); }

/* selected-body editor */
.editor.hidden { display: none; }
.editor-hint {
  font-size: 11px;
  color: var(--green-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.editor .btn-grid { grid-template-columns: repeat(3, 1fr); margin-bottom: 10px; }

/* help button + popover */
.help-btn {
  width: 22px; height: 22px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--amber);
  background: rgba(255, 194, 77, 0.06);
  border: 1px solid var(--amber);
  cursor: pointer;
  line-height: 1;
}
.help-btn:hover { background: rgba(255, 194, 77, 0.18); box-shadow: 0 0 6px rgba(255, 194, 77, 0.55); }
.popover {
  position: fixed;
  top: 48px; right: 12px;
  z-index: 30;
  width: 300px;
  max-width: 92vw;
  padding: 12px 14px;
  background: var(--panel-bg);
  border: 1px solid var(--line);
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
}
.popover.hidden { display: none; }
.popover-title {
  font-size: 13px; letter-spacing: 3px; color: var(--green-dim);
  border-bottom: 1px dashed var(--line-soft); padding-bottom: 5px; margin-bottom: 8px;
}
.popover-title::before { content: '> '; color: var(--amber); }
.popover-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 12px;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.popover-grid > span:nth-child(odd) { color: var(--cyan); }
.popover-grid > span.k {
  color: var(--bg); background: var(--green); padding: 0 5px;
  justify-self: start; box-shadow: var(--glow);
}

/* floating hover tooltip */
.tip {
  position: fixed;
  z-index: 40;
  max-width: 240px;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: 0.5px;
  color: var(--green);
  background: rgba(2, 12, 8, 0.96);
  border: 1px solid var(--line);
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.6);
  pointer-events: none;
}
.tip.hidden { display: none; }

/* panel toggle button */
#panel-toggle {
  position: fixed;
  top: 56px;
  right: 332px;
  z-index: 11;
  padding: 5px 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--amber);
  background: var(--panel-bg);
  border: 1px solid var(--amber);
  cursor: pointer;
  transition: right 0.25s ease;
}
body.panel-hidden #panel-toggle { right: 12px; }

@media (max-width: 560px) {
  .brand { font-size: 20px; }
  #panel { width: 88vw; }
  #panel-toggle { right: calc(88vw + 12px); }
  body.panel-hidden #panel-toggle { right: 12px; }
}