:root {
  --bg: #05070d;
  --panel: rgba(8, 12, 22, 0.72);
  --panel-strong: rgba(8, 12, 22, 0.88);
  --line: rgba(214, 226, 255, 0.18);
  --ink: #f7fbff;
  --muted: #adbad3;
  --cyan: #50e6ff;
  --gold: #f9d36a;
  --pink: #ff6ad5;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.46);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 8;
  padding: 0.58rem 0.75rem;
  border-radius: 8px;
  background: var(--cyan);
  color: #001318;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.string-shell {
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  isolation: isolate;
}

#string-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: radial-gradient(circle at 50% 45%, #111a31 0, var(--bg) 62%);
  touch-action: none;
}

.scene-head,
.control-panel {
  position: fixed;
  z-index: 2;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.scene-head {
  top: clamp(0.8rem, 2vw, 1.35rem);
  left: clamp(0.8rem, 2vw, 1.35rem);
  width: min(28rem, calc(100% - 1.6rem));
  padding: clamp(0.9rem, 2vw, 1.2rem);
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.scene-head h1,
.panel-title h2 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1;
}

.scene-head h1 {
  font-size: clamp(2rem, 6vw, 4.6rem);
}

.scene-head nav,
.control-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.95rem;
}

.scene-head a,
.scene-head button,
.control-panel button,
.control-panel select {
  min-height: 2.35rem;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.72rem;
  background: rgba(15, 23, 42, 0.72);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}

.scene-head a:hover,
.scene-head button:hover,
.control-panel button:hover,
.control-panel select:hover,
.scene-head a:focus-visible,
.scene-head button:focus-visible,
.control-panel select:focus-visible,
.control-panel input:focus-visible {
  border-color: rgba(80, 230, 255, 0.7);
  outline: 2px solid rgba(80, 230, 255, 0.24);
  outline-offset: 2px;
}

.control-panel {
  right: clamp(0.8rem, 2vw, 1.35rem);
  bottom: clamp(0.8rem, 2vw, 1.35rem);
  width: min(22rem, calc(100% - 1.6rem));
  padding: 1rem;
  display: grid;
  gap: 0.82rem;
}

.panel-title {
  display: grid;
  gap: 0.28rem;
}

.panel-title h2 {
  font-size: 1.12rem;
}

.control-panel label {
  display: grid;
  gap: 0.4rem;
  min-width: 0;
}

.control-panel label > span {
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 760;
}

.control-panel input[type="range"] {
  width: 100%;
  accent-color: var(--cyan);
}

.control-panel select {
  width: 100%;
  background: var(--panel-strong);
  color-scheme: dark;
}

.status {
  min-height: 1.2rem;
  margin: 0;
  color: var(--gold);
  font-size: 0.86rem;
  line-height: 1.45;
}

@media (max-width: 720px) {
  body {
    overflow: auto;
  }

  .string-shell {
    min-height: 100dvh;
    display: grid;
    align-content: space-between;
    gap: min(28vh, 12rem);
    padding: 0.75rem;
  }

  #string-canvas {
    position: fixed;
  }

  .scene-head,
  .control-panel {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    width: 100%;
  }

  .control-panel {
    align-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  #string-canvas {
    touch-action: auto;
  }
}