:root {
  --bg1: #f4f1e8;
  --bg2: #dceaf2;
  --panel: #ffffffcc;
  --ink: #1d2630;
  --accent: #0077b6;
  --accent-dark: #005f91;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, var(--bg1), var(--bg2));
  min-height: 100vh;
}

.app {
  width: min(980px, 92vw);
  margin: 2rem auto;
  padding: 1.5rem;
  background: var(--panel);
  backdrop-filter: blur(6px);
  border-radius: 16px;
  box-shadow: 0 12px 30px #0000001a;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
}

.drop-zone {
  border: 2px dashed #5f7894;
  border-radius: 14px;
  padding: 1.4rem;
  text-align: center;
  transition: 0.2s ease;
  background: #ffffff88;
}

.drop-zone.dragover {
  border-color: var(--accent);
  transform: translateY(-2px);
  background: #ebf7ff;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.controls {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.8rem;
  align-items: end;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.95rem;
  font-weight: 600;
}

input[type="number"] {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid #9cb0c4;
  border-radius: 8px;
  font-size: 0.95rem;
}

.canvas-wrap {
  margin-top: 1rem;
  border-radius: 12px;
  overflow: auto;
  background: #fbfdff;
  border: 1px solid #ccd8e5;
  min-height: 180px;
}

canvas {
  display: block;
  max-width: 100%;
  touch-action: none;
}

.status {
  min-height: 1.25rem;
  margin-top: 0.8rem;
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .app {
    margin: 1rem auto;
    padding: 1rem;
  }
}