:root {
  color-scheme: dark;
  --paper: #0c0d0b;
  --panel: #151612;
  --panel-2: #1b1d17;
  --ink: #ece6d2;
  --muted: #a49d8a;
  --line: #3c3b30;
  --line-strong: #706d58;
  --accent: #d5b35e;
  --red: #ce4f43;
  --green: #7fa96b;
  --blue: #6b91b7;
  --focus: #e6cf86;
  --sidebar: 380px;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  letter-spacing: 0;
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

button,
select {
  min-height: 36px;
}

button {
  border: 1px solid var(--line-strong);
  background: #10110e;
  color: var(--ink);
  cursor: pointer;
  padding: 7px 10px;
  text-transform: uppercase;
  white-space: normal;
  overflow-wrap: anywhere;
}

button:hover,
button:focus-visible {
  border-color: var(--focus);
  outline: 1px solid var(--focus);
  outline-offset: 1px;
}

button.primary {
  background: #211f16;
  color: var(--accent);
  border-color: var(--accent);
}

button.wide {
  width: 100%;
}

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

select {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 0;
  background: #0f100d;
  color: var(--ink);
  padding: 8px 10px;
  min-height: 36px;
}

input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  height: 22px;
  margin: 0;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: linear-gradient(to right, var(--line-strong), var(--line));
  border: 0;
}

input[type="range"]::-moz-range-track {
  height: 4px;
  background: linear-gradient(to right, var(--line-strong), var(--line));
  border: 0;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: grab;
}

input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: #0a0b09;
  position: relative;
  cursor: pointer;
}

input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 6px rgba(213, 179, 94, 0.55);
}

input[type="checkbox"]:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: 2px;
}

.app-shell {
  position: relative;
  height: 100vh;
  height: 100dvh;
}

/* The canvas/stage is always full viewport. The sidebar floats on top so
   toggling it never resizes or recenters the orrery. */
.stage {
  position: absolute;
  inset: 0;
  background: #050604;
}

#space {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

.hud {
  position: absolute;
  pointer-events: none;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
  text-transform: uppercase;
}

.top-left {
  top: 14px;
  left: 16px;
}

.bottom-left {
  bottom: 14px;
  left: 16px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  max-width: calc(100% - 32px);
}

.brand {
  color: var(--accent);
  letter-spacing: 0.18em;
  margin-bottom: 4px;
}

.hud-stack {
  display: flex;
  gap: 6px;
  pointer-events: auto;
}

.hud-stack-vertical {
  flex-direction: column;
  margin-top: 14px;
  align-items: flex-start;
}

.hud-btn {
  width: 34px;
  height: 34px;
  min-height: 34px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(16, 17, 14, 0.85);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-transform: none;
  letter-spacing: 0;
}

.hud-btn.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--muted);
}

.hud-btn.ghost:hover,
.hud-btn.ghost:focus-visible {
  background: rgba(213, 179, 94, 0.08);
  border-color: var(--accent);
  color: var(--accent);
}

.hud-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
}

.hud-btn:hover,
.hud-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--sidebar);
  height: 100vh;
  height: 100dvh;
  min-height: 0;
  overflow: auto;
  border-left: 1px solid var(--line-strong);
  background: var(--panel);
  transition: transform 220ms ease;
  -webkit-overflow-scrolling: touch;
  z-index: 30;
}

body.sidebar-hidden .sidebar {
  transform: translateX(100%);
  pointer-events: none;
}

.sidebar-header,
.panel {
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
}

.tabs {
  display: none;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.tab {
  flex: 1;
  border: 0;
  border-right: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px;
  min-height: 44px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
}

.tab:last-child {
  border-right: 0;
}

.tab[aria-selected="true"] {
  color: var(--accent);
  background: var(--panel);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.tab:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: -2px;
}

.sidebar-header h1 {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.sidebar-header p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
}

.panel h2 {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.panel-sub {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

.hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 10.5px;
  line-height: 1.5;
  font-style: italic;
}

.action-desc {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 11px;
  line-height: 1.55;
  opacity: 0.8;
}

.section-divider {
  margin: 18px 0 10px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.icon-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  margin-bottom: 12px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  min-height: 42px;
  padding: 0;
  background: #0f100d;
  border: 1px solid var(--line-strong);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
  fill: var(--ink);
  pointer-events: none;
}

.icon-btn.primary svg {
  fill: var(--accent);
}

.icon-btn.muted svg {
  opacity: 0.55;
}

.icon-btn:hover svg,
.icon-btn:focus-visible svg {
  fill: var(--focus);
}

.control {
  display: grid;
  gap: 6px;
  margin: 12px 0;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.control > span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.control output {
  color: var(--ink);
}

.control.inline {
  display: flex;
  align-items: center;
  gap: 9px;
}

.selected-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 12px;
}

.selected-tag {
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

.selected-name {
  font-size: 18px;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
}

.small-grid strong {
  font-size: 12px;
  font-weight: 500;
}

.list {
  display: grid;
  gap: 7px;
  max-height: 150px;
  overflow: auto;
  margin-top: 12px;
}

.list.compact {
  max-height: 118px;
}

.item {
  border: 1px solid var(--line);
  background: #11120f;
  padding: 7px 8px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.4;
}

.item strong {
  color: var(--ink);
  font-weight: 500;
}

.item .muted {
  color: var(--muted);
  font-size: 10px;
}

.note-name {
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.item button {
  min-height: 24px;
  margin-top: 6px;
  padding: 3px 7px;
  font-size: 10px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 6, 4, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal[hidden] {
  display: none;
}

.modal-card {
  position: relative;
  max-width: 520px;
  margin: 24px;
  padding: 22px 24px 26px;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.modal-card h2 {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.modal-card p {
  margin: 0 0 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.modal-card em {
  font-style: normal;
  color: var(--ink);
}

.modal-link a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
}

.modal-link a:hover {
  color: var(--focus);
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  min-height: 0;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
}

/* Tablet / mobile: sidebar becomes a slide-up drawer covering ~72vh.
   The same `body.sidebar-hidden` class controls the hide state on every
   layout — only the transform direction changes. JS adds the class by
   default on small screens so the canvas takes the full surface. */
@media (max-width: 900px) {
  .tabs {
    display: flex;
  }

  .panel {
    display: none;
  }

  body[data-tab="transport"] .panel[data-panel="transport"],
  body[data-tab="body"] .panel[data-panel="body"],
  body[data-tab="gates"] .panel[data-panel="gates"],
  body[data-tab="probes"] .panel[data-panel="probes"] {
    display: block;
  }

  .sidebar {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 72vh;
    height: 72dvh;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
    z-index: 40;
    box-shadow: 0 -12px 28px rgba(0, 0, 0, 0.4);
    transform: translateY(0);
  }

  body.sidebar-hidden .sidebar {
    transform: translateY(100%);
    pointer-events: none;
  }

  .panel,
  .sidebar-header {
    padding: 12px 14px;
  }

  .icon-btn {
    height: 46px;
    min-height: 46px;
  }

  button {
    min-height: 40px;
  }

  .top-left {
    top: max(12px, env(safe-area-inset-top));
    left: max(12px, env(safe-area-inset-left));
  }

  .bottom-left {
    bottom: max(12px, env(safe-area-inset-bottom));
    left: max(12px, env(safe-area-inset-left));
  }
}