:root {
    --bg: #0b0c0d;
    --coral: #E0704A;
    --teal: #2AAE87;
    --violet: #8B84E8;
    --text-dim: rgba(255,255,255,0.32);
    --text-dimmer: rgba(255,255,255,0.16);
    --text-strong: rgba(255,255,255,0.88);
    --ctrl-bg: rgba(255,255,255,0.05);
    --ctrl-border: rgba(255,255,255,0.14);
    --ctrl-hover-bg: rgba(255,255,255,0.1);
    --ctrl-hover-text: rgba(255,255,255,0.7);
    --panel-bg: #17181a;
  }

  html[data-theme="ejfel"] {
    --bg: #050506;
    --coral: #C85A3A;
    --teal: #1E8F6E;
    --violet: #6E67C9;
    --text-dim: rgba(255,255,255,0.26);
    --text-dimmer: rgba(255,255,255,0.12);
    --text-strong: rgba(255,255,255,0.85);
    --ctrl-bg: rgba(255,255,255,0.04);
    --ctrl-border: rgba(255,255,255,0.1);
    --ctrl-hover-bg: rgba(255,255,255,0.08);
    --ctrl-hover-text: rgba(255,255,255,0.6);
    --panel-bg: #0c0d0f;
  }

  html[data-theme="tinta"] {
    --bg: #10131a;
    --coral: #E08A5C;
    --teal: #3FB8A6;
    --violet: #9C93E0;
    --text-dim: rgba(230,235,245,0.32);
    --text-dimmer: rgba(230,235,245,0.16);
    --text-strong: rgba(230,235,245,0.9);
    --ctrl-bg: rgba(230,235,245,0.06);
    --ctrl-border: rgba(230,235,245,0.14);
    --ctrl-hover-bg: rgba(230,235,245,0.11);
    --ctrl-hover-text: rgba(230,235,245,0.75);
    --panel-bg: #181c24;
  }

  html[data-theme="papir"] {
    --bg: #F4F1EA;
    --coral: #C85A30;
    --teal: #0F7A5E;
    --violet: #5D54B0;
    --text-dim: rgba(30,28,24,0.4);
    --text-dimmer: rgba(30,28,24,0.2);
    --text-strong: rgba(30,28,24,0.9);
    --ctrl-bg: rgba(30,28,24,0.05);
    --ctrl-border: rgba(30,28,24,0.16);
    --ctrl-hover-bg: rgba(30,28,24,0.1);
    --ctrl-hover-text: rgba(30,28,24,0.75);
    --panel-bg: #FBFAF6;
  }

  html[data-theme="nappal"] {
    --bg: #FFFFFF;
    --coral: #D85A30;
    --teal: #0E8A67;
    --violet: #6B62CC;
    --text-dim: rgba(20,20,22,0.36);
    --text-dimmer: rgba(20,20,22,0.18);
    --text-strong: rgba(20,20,22,0.9);
    --ctrl-bg: rgba(20,20,22,0.04);
    --ctrl-border: rgba(20,20,22,0.14);
    --ctrl-hover-bg: rgba(20,20,22,0.08);
    --ctrl-hover-text: rgba(20,20,22,0.75);
    --panel-bg: #ffffff;
  }

  * { box-sizing: border-box; }

  html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    cursor: none;
  }

  body.ui-visible { cursor: default; }

  canvas {
    display: block;
    width: 100vw;
    height: 100vh;
  }

  #hint {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-dim);
    font-size: 12px;
    letter-spacing: 0.04em;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
    user-select: none;
    text-align: center;
    line-height: 1.6;
  }

  body.ui-visible #hint { opacity: 1; }

  #controls {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
    max-width: calc(100vw - 40px);
    z-index: 10;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
  }

  body.ui-visible #controls {
    opacity: 1;
    pointer-events: auto;
  }

  #theme-buttons {
    display: flex;
    gap: 6px;
  }

  #controls button {
    background: var(--ctrl-bg);
    border: 0.5px solid var(--ctrl-border);
    color: var(--text-dim);
    font-size: 12px;
    letter-spacing: 0.02em;
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    font-family: inherit;
  }

  #controls button:hover {
    background: var(--ctrl-hover-bg);
    color: var(--ctrl-hover-text);
  }

  #controls button:focus-visible {
    outline: 1px solid var(--ctrl-hover-text);
    outline-offset: 2px;
  }

  .theme-btn.active {
    color: var(--text-strong);
    border-color: var(--ctrl-hover-text);
    background: var(--ctrl-hover-bg);
  }

  #speed-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--ctrl-bg);
    border: 0.5px solid var(--ctrl-border);
    border-radius: 6px;
    padding: 6px 12px;
  }

  #speed-control label {
    font-size: 12px;
    color: var(--text-dim);
    letter-spacing: 0.02em;
    white-space: nowrap;
  }

  #speed-control input[type="range"] {
    width: 80px;
    accent-color: var(--ctrl-hover-text);
    cursor: pointer;
  }

  .overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    z-index: 20;
  }

  .overlay.open {
    opacity: 1;
    pointer-events: auto;
  }

  .panel {
    background: var(--panel-bg);
    color: var(--text-strong);
    border-radius: 12px;
    border: 0.5px solid var(--ctrl-border);
    max-width: 480px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 28px 28px 24px;
    position: relative;
    font-size: 14px;
    line-height: 1.7;
  }

  .panel h2 {
    font-size: 17px;
    font-weight: 500;
    margin: 0 0 14px;
    color: var(--text-strong);
  }

  .panel p {
    margin: 0 0 14px;
  }

  .panel ul {
    margin: 0 0 14px;
    padding-left: 18px;
  }

  .panel li {
    margin-bottom: 8px;
  }

  .panel li b {
    color: var(--text-strong);
    font-weight: 500;
  }

  .panel .signature {
    color: var(--text-dim);
    font-style: italic;
    margin-top: 20px;
  }

  .panel-close {
    position: absolute;
    top: 14px;
    right: 14px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    padding: 4px 8px;
  }

  .panel-close:hover { color: var(--text-strong); }

  #intro {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-dim);
    font-size: 13px;
    letter-spacing: 0.03em;
    text-align: center;
    line-height: 1.8;
    opacity: 0;
    transition: opacity 2.2s ease;
    pointer-events: none;
    user-select: none;
    max-width: 320px;
  }

  #intro.show { opacity: 1; }

  #intro .session {
    display: block;
    font-size: 11px;
    color: var(--text-dimmer);
    margin-top: 6px;
    letter-spacing: 0.06em;
  }

  #pause-note {
    position: fixed;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-dimmer);
    font-size: 11px;
    letter-spacing: 0.04em;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
    user-select: none;
  }

  #pause-note.show { opacity: 1; }

  #load-panel {
    position: fixed;
    bottom: 24px;
    left: 24px;
    font-size: 11px;
    color: var(--text-dimmer);
    letter-spacing: 0.03em;
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  #load-panel.show { opacity: 1; }

  #load-bar {
    width: 60px;
    height: 3px;
    background: var(--ctrl-border);
    border-radius: 2px;
    overflow: hidden;
  }

  #load-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--text-dim);
    transition: width 0.3s ease;
  }

  #load-caption {
    font-size: 10px;
    color: var(--text-dimmer);
    font-style: italic;
  }

  #version-note {
    position: fixed;
    bottom: 24px;
    right: 24px;
    font-size: 11px;
    color: var(--text-dimmer);
    letter-spacing: 0.02em;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
    user-select: none;
    max-width: 220px;
    text-align: right;
    line-height: 1.5;
  }

  body.ui-visible #version-note { opacity: 1; }

  @media (prefers-reduced-motion: reduce) {
    #hint::after {
      content: " (a mozgás csökkentve, a rendszerbeállítás szerint)";
    }
  }