:root {
  --bg-start: #0f1325;
  --bg-end: #030407;
  --panel-bg: rgba(13, 18, 34, 0.78);
  --panel-border: rgba(184, 199, 255, 0.22);
  --text-primary: #eef2ff;
  --text-secondary: #b8c2e0;
  --field-bg: rgba(22, 30, 53, 0.9);
  --field-border: rgba(190, 203, 255, 0.26);
  --button-bg: rgba(154, 176, 255, 0.2);
  --button-border: rgba(190, 205, 255, 0.36);
  --button-bg-hover: rgba(174, 193, 255, 0.3);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--text-primary);
  font-family: "Avenir Next", "Futura", "Trebuchet MS", sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(131, 164, 255, 0.22), transparent 34%),
    radial-gradient(circle at 80% 12%, rgba(85, 115, 211, 0.2), transparent 30%),
    linear-gradient(145deg, var(--bg-start), var(--bg-end));
}

.app-shell {
  width: min(1200px, 100%);
  display: grid;
  gap: 16px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 20px;
  backdrop-filter: blur(4px);
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
  letter-spacing: 0.04em;
}

.app-header p {
  margin: 6px 0 0;
  color: var(--text-secondary);
}

.controls {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  align-items: end;
}

.control {
  display: grid;
  gap: 6px;
}

.control span {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

select,
button {
  appearance: none;
  border-radius: 10px;
  border: 1px solid var(--field-border);
  background: var(--field-bg);
  color: var(--text-primary);
  padding: 10px 12px;
  font: inherit;
}

button {
  background: var(--button-bg);
  border-color: var(--button-border);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

button:hover:not(:disabled) {
  background: var(--button-bg-hover);
  border-color: rgba(204, 216, 255, 0.5);
}

button:disabled {
  opacity: 0.55;
  cursor: progress;
}

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

.meta {
  margin: 0;
  min-height: 1.2em;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.preview {
  display: grid;
  place-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  overflow: hidden;
  background: rgba(2, 4, 9, 0.9);
  min-height: 260px;
}

canvas {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: min(70vh, 760px);
}