:root {
  --ink: #dfe9f5;
  --dim: #8b9bb0;
  --cyan: #45e9ff;
  --magenta: #ff4fa8;
  --amber: #ffb35c;
  --bg: #05070c;
  --panel: rgba(8, 11, 18, 0.86);
  --line: rgba(120, 190, 230, 0.18);
  --ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ui);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

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

/* ---------- Peittokerrokset ---------- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: calc(24px + var(--safe-t)) 20px calc(24px + var(--safe-b));
  background:
    radial-gradient(120% 90% at 50% 18%, rgba(20, 40, 62, 0.55), transparent 60%),
    radial-gradient(80% 60% at 82% 88%, rgba(72, 12, 48, 0.38), transparent 65%),
    rgba(3, 5, 9, 0.9);
  backdrop-filter: blur(14px) saturate(115%);
  -webkit-backdrop-filter: blur(14px) saturate(115%);
  animation: fade-in 0.5s ease both;
}

.overlay[hidden] { display: none; }
.overlay.slim { background: rgba(3, 5, 9, 0.72); backdrop-filter: blur(8px); }

.overlay-inner {
  width: min(680px, 100%);
  max-height: 100%;
  overflow-y: auto;
  text-align: center;
  padding: 4px;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--dim);
}

.title {
  margin: 0;
  font-size: clamp(34px, 9vw, 62px);
  font-weight: 200;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.05;
  color: #eaf6ff;
  text-shadow: 0 0 26px rgba(69, 233, 255, 0.35), 0 0 60px rgba(255, 79, 168, 0.18);
}
.title span { color: var(--magenta); text-shadow: 0 0 28px rgba(255, 79, 168, 0.5); }
.title.small { font-size: clamp(24px, 6vw, 34px); letter-spacing: 0.2em; }

.tagline {
  margin: 16px auto 0;
  max-width: 46ch;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.65;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: 34px 0 30px;
  text-align: left;
}
.controls-grid > div {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  background: linear-gradient(180deg, rgba(18, 26, 38, 0.5), rgba(8, 12, 18, 0.3));
}
.controls-grid h3 {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 500;
}
.controls-grid ul { margin: 0; padding: 0; list-style: none; }
.controls-grid li {
  font-size: 13px;
  color: var(--dim);
  padding: 4px 0;
  line-height: 1.5;
}
.controls-grid b {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.start-btn {
  appearance: none;
  border: 1px solid rgba(69, 233, 255, 0.4);
  background: linear-gradient(180deg, rgba(69, 233, 255, 0.16), rgba(69, 233, 255, 0.05));
  color: #eaf9ff;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  padding: 15px 34px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
  box-shadow: 0 0 0 rgba(69, 233, 255, 0);
}
.start-btn:hover:not(:disabled) {
  background: linear-gradient(180deg, rgba(69, 233, 255, 0.3), rgba(69, 233, 255, 0.1));
  box-shadow: 0 0 34px rgba(69, 233, 255, 0.28);
}
.start-btn:disabled { opacity: 0.45; cursor: default; letter-spacing: 0.18em; }
.start-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.foot {
  margin: 22px 0 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(139, 155, 176, 0.6);
}

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

.hud {
  position: fixed;
  z-index: 50;
  top: calc(12px + var(--safe-t));
  right: 12px;
  display: flex;
  gap: 8px;
}
.hud[hidden] { display: none; }

.hud-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(8, 12, 18, 0.55);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 15px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.hud-btn:hover { color: var(--cyan); border-color: rgba(69, 233, 255, 0.45); }
.hud-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

.gear {
  width: 15px; height: 15px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  position: relative;
}
.gear::before, .gear::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 21px; height: 3px;
  margin: -1.5px 0 0 -10.5px;
  border-left: 3px solid currentColor;
  border-right: 3px solid currentColor;
  box-sizing: border-box;
}
.gear::after { transform: rotate(90deg); }

/* ---------- Suorituskykymittari ---------- */

.perf {
  position: fixed;
  z-index: 45;
  top: calc(58px + var(--safe-t));
  right: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(6, 9, 14, 0.6);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
  pointer-events: none;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.perf[hidden] { display: none; }
.perf span:not(:first-child) { color: var(--dim); }

/* ---------- Asetuspaneeli ---------- */

.panel {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(3, 5, 9, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: fade-in 0.22s ease both;
}
.panel[hidden] { display: none; }

.panel-inner {
  width: min(420px, 100%);
  max-height: 100%;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  background: var(--panel);
}
.panel-inner h2 {
  margin: 0 0 20px;
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--cyan);
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
}
.row-label { font-size: 13px; color: var(--ink); }

.hint {
  margin: 0 0 12px;
  font-size: 11px;
  line-height: 1.55;
  color: rgba(139, 155, 176, 0.75);
}

.seg { display: flex; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--dim);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 8px 11px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-checked="true"] { background: rgba(69, 233, 255, 0.16); color: #eaf9ff; }
.seg button:focus-visible { outline: 2px solid var(--cyan); outline-offset: -2px; }

input[type="range"] { width: 150px; accent-color: #45e9ff; }
input[type="checkbox"] { width: 17px; height: 17px; accent-color: #45e9ff; }

.ghost-btn {
  margin-top: 18px;
  width: 100%;
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--dim);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  padding: 12px;
  border-radius: 9px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.ghost-btn:hover { color: var(--ink); border-color: rgba(69, 233, 255, 0.4); }

/* ---------- Kosketusohjaus ---------- */

.touch-layer {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}
.touch-layer[hidden] { display: none; }

.stick-base {
  position: absolute;
  left: calc(26px + env(safe-area-inset-left, 0px));
  bottom: calc(30px + var(--safe-b));
  width: 116px;
  height: 116px;
  border-radius: 50%;
  border: 1px solid rgba(120, 190, 230, 0.22);
  background: radial-gradient(circle at 50% 50%, rgba(20, 34, 48, 0.4), rgba(8, 12, 18, 0.24));
  opacity: 0.5;
  transition: opacity 0.2s ease;
}
.stick-base.active { opacity: 0.95; }

.stick-knob {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 48px;
  height: 48px;
  margin: -24px 0 0 -24px;
  border-radius: 50%;
  border: 1px solid rgba(69, 233, 255, 0.5);
  background: radial-gradient(circle at 50% 40%, rgba(69, 233, 255, 0.3), rgba(69, 233, 255, 0.07));
  box-shadow: 0 0 18px rgba(69, 233, 255, 0.22);
  will-change: transform;
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .overlay { animation: none; }
  .panel { animation: none; }
}

@media (max-width: 520px) {
  .controls-grid { margin: 26px 0 24px; }
  .overlay { padding-left: 16px; padding-right: 16px; }
}

/* Matala vaakanäyttö puhelimessa: aloituspainikkeen pitää mahtua ruudulle
   ilman vierittämistä. */
@media (max-height: 460px) {
  .overlay { padding-top: calc(12px + var(--safe-t)); padding-bottom: calc(12px + var(--safe-b)); }
  .eyebrow { display: none; }
  .title { font-size: clamp(22px, 5vw, 32px); letter-spacing: 0.12em; }
  .tagline { display: none; }
  .overlay.slim .tagline { display: block; margin-top: 10px; }
  .controls-grid {
    margin: 14px 0 14px;
    gap: 10px;
    grid-template-columns: 1fr 1fr;
  }
  .controls-grid > div { padding: 9px 12px; }
  .controls-grid h3 { margin-bottom: 6px; }
  .controls-grid li { padding: 2px 0; font-size: 12px; }
  .start-btn { padding: 11px 26px; letter-spacing: 0.18em; }
  .foot { display: none; }
  .panel-inner { padding: 16px; }
  .panel-inner h2 { margin-bottom: 12px; }
  .row { padding: 6px 0; }
}