:root {
  --panel: rgba(8, 13, 22, 0.72);
  --panel-strong: rgba(8, 13, 22, 0.86);
  --line: rgba(226, 232, 240, 0.18);
  --ink: #f8fafc;
  --muted: #b6c2d2;
  --accent: #2dd4bf;
  --accent-2: #38bdf8;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background: #070b12;
  color: var(--ink);
  font-family: Inter, Poppins, 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: 10;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  background: var(--accent);
  color: #03201f;
  transform: translateY(-150%);
}

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

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

#fractal-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  background: #070b12;
}

.scene-header,
.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-header {
  top: clamp(0.85rem, 2vw, 1.5rem);
  left: clamp(0.85rem, 2vw, 1.5rem);
  width: min(31rem, calc(100vw - 2rem));
  padding: clamp(1rem, 2vw, 1.35rem);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

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

.scene-header h1 {
  font-size: clamp(2rem, 4vw, 4rem);
}

.scene-header p:not(.eyebrow) {
  max-width: 34rem;
  margin: 0.85rem 0 0;
  color: var(--muted);
}

.scene-header nav,
.control-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.scene-header a,
.scene-header button,
.control-panel button,
.control-panel select {
  min-height: 2.45rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.78rem;
  background: rgba(15, 23, 42, 0.74);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}

.scene-header a:hover,
.scene-header button:hover,
.control-panel button:hover,
.control-panel select:hover {
  border-color: rgba(45, 212, 191, 0.6);
  color: var(--ink);
}

.control-panel {
  right: clamp(0.85rem, 2vw, 1.5rem);
  top: clamp(0.85rem, 2vw, 1.5rem);
  width: min(22rem, calc(100vw - 2rem));
  padding: 1rem;
  display: grid;
  gap: 0.95rem;
}

.panel-heading {
  display: grid;
  gap: 0.35rem;
}

.panel-heading h2 {
  font-size: 1.15rem;
}

.control-panel label {
  display: grid;
  gap: 0.42rem;
}

.control-panel label > span {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

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

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

.hint,
.status {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.status {
  color: var(--accent-2);
}

@media (max-width: 820px) {
  body {
    overflow: auto;
  }

  .scene-header,
  .control-panel {
    position: relative;
    left: auto;
    right: auto;
    top: auto;
    width: auto;
    margin: 0.85rem;
  }

  .fractal-shell {
    min-height: 100dvh;
    padding-bottom: 0.85rem;
    display: grid;
    align-content: space-between;
  }

  #fractal-canvas {
    position: fixed;
    min-height: 100dvh;
  }
}