/* Helm's Deep - interface chrome. The 3D scene is the content; everything
   here is a thin, quiet layer on top of it. */

:root {
  color-scheme: dark light;

  --ink: #e8eef4;
  --ink-dim: #9fb0be;
  --panel: rgba(14, 19, 26, 0.82);
  --panel-solid: #10161e;
  --edge: rgba(255, 255, 255, 0.14);
  --edge-strong: rgba(255, 255, 255, 0.28);
  --accent: #d8a25a;
  --accent-dim: #8d6a38;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
  --ui: 13px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  --mono: 12px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --ink: #16202b;
    --ink-dim: #55636f;
    --panel: rgba(247, 249, 251, 0.86);
    --panel-solid: #f4f6f8;
    --edge: rgba(0, 0, 0, 0.14);
    --edge-strong: rgba(0, 0, 0, 0.3);
    --accent: #a2661c;
    --accent-dim: #c58f3d;
    --shadow: 0 18px 50px rgba(20, 28, 38, 0.22);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: #10161e;
  color: var(--ink);
  font: var(--ui);
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: light) {
  html, body { background: #cfd8e0; }
}

#scene {
  display: block;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
}

body.is-playing { cursor: none; }

/* ------------------------------------------------------------- overlays */

.screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  z-index: 20;
}

.screen[hidden] { display: none; }

#loading { background: #0d131a; z-index: 30; }

#overlay {
  background: radial-gradient(120% 90% at 50% 40%, rgba(8, 12, 17, 0.55), rgba(6, 9, 13, 0.9));
  backdrop-filter: blur(3px);
}

@media (prefers-color-scheme: light) {
  #loading { background: #e9eef2; }
  #overlay {
    background: radial-gradient(120% 90% at 50% 40%, rgba(240, 244, 248, 0.6), rgba(210, 219, 228, 0.92));
  }
}

.panel {
  width: min(560px, 100%);
  padding: 28px 30px 26px;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 14px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel h1 {
  margin: 0 0 4px;
  font-size: 27px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.panel .sub {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.panel .lead {
  margin: 0 0 14px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.65;
}

.panel .hint {
  margin: 14px 0 0;
  color: var(--ink-dim);
  font-size: 12px;
  line-height: 1.6;
}

.panel .err {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-left: 3px solid #c0563f;
  background: rgba(192, 86, 63, 0.12);
  font: var(--mono);
  word-break: break-word;
}

.keys {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  margin: 16px 0 20px;
  padding: 0;
  font-size: 13px;
}

.keys dt {
  margin: 0;
  color: var(--accent);
  font: var(--mono);
  white-space: nowrap;
}

.keys dd {
  margin: 0;
  color: var(--ink-dim);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

button {
  font: var(--ui);
  font-weight: 600;
  font-size: 14px;
  color: #16110a;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 10px 20px;
  cursor: pointer;
}

button.ghost {
  color: var(--ink);
  background: transparent;
  border-color: var(--edge-strong);
}

button:hover { filter: brightness(1.08); }
button:active { transform: translateY(1px); }

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* --------------------------------------------------------------- loader */

.loader {
  width: min(420px, 100%);
  text-align: center;
}

.loader h2 {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 600;
}

.loader p {
  margin: 0 0 16px;
  color: var(--ink-dim);
  font-size: 13px;
  min-height: 1.5em;
}

.track {
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

@media (prefers-color-scheme: light) {
  .track { background: rgba(0, 0, 0, 0.12); }
}

.track > i {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: var(--accent);
  transition: width 220ms ease-out;
}

/* ------------------------------------------------------------------ HUD */

#hud {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  font: var(--mono);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85);
  color: #e8eef4;
}

@media (prefers-color-scheme: light) {
  #hud {
    color: #10161e;
    text-shadow: 0 1px 3px rgba(255, 255, 255, 0.85);
  }
}

#hud .corner {
  position: absolute;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 9px;
  color: var(--ink);
  text-shadow: none;
  backdrop-filter: blur(6px);
}

#hud-tl { top: 14px; left: 14px; }
#hud-tr { top: 14px; right: 14px; text-align: right; }
#hud-bl { bottom: 14px; left: 14px; max-width: 46ch; }
#hud-br { bottom: 14px; right: 14px; text-align: right; }

#hud .title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

#hud .title small {
  display: block;
  margin-top: 2px;
  color: var(--ink-dim);
  font: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#hud .row { white-space: pre; }
#hud .dim { color: var(--ink-dim); }

#hud .legend {
  margin: 0;
  padding: 0;
  color: var(--ink-dim);
  font: var(--mono);
  font-size: 11px;
  line-height: 1.7;
}

#hud .legend b {
  color: var(--accent);
  font-weight: 600;
}

/* crosshair */
#reticle {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  opacity: 0.75;
}

#reticle::before,
#reticle::after {
  content: "";
  position: absolute;
  background: #ffffff;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.9);
}

#reticle::before { left: 8px; top: 0; width: 2px; height: 18px; }
#reticle::after { left: 0; top: 8px; width: 18px; height: 2px; }

/* --------------------------------------------------------- small screens */

@media (max-width: 720px) {
  #hud-bl { display: none; }
  .panel { padding: 22px 20px; }
  .panel h1 { font-size: 22px; }
}

/* -------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  .track > i { transition: none; }
  button:active { transform: none; }
  #reticle { opacity: 0.55; }
}

body.reduced #reticle { opacity: 0.55; }

/* --------------------------------------------------------------- print/a11y */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}