:root {
  --bg: #f4efe1;
  --text: #202020;
  --panel: #fffaf0;
  --panel-border: #d9ccaf;
  --accent: #876c38;
  --accent-hover: #6f582d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 15%, #fff6df 0%, transparent 35%),
    radial-gradient(circle at 85% 20%, #ead8af 0%, transparent 30%),
    linear-gradient(160deg, #f8f1dd, var(--bg));
}

.app {
  width: min(1000px, 92vw);
  margin: 4rem auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 14px 30px rgba(58, 42, 8, 0.14);
}

h1 {
  margin: 0;
  font-family: "Marcellus", serif;
  letter-spacing: 0.02em;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}

.lead {
  margin-top: 0.7rem;
  margin-bottom: 1.3rem;
  font-size: 1.05rem;
}

form {
  display: grid;
  gap: 0.75rem;
}

label {
  font-weight: 700;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  border: 1px solid #c7b58f;
  background: #fffdf8;
  color: var(--text);
  border-radius: 10px;
  padding: 0.72rem 0.8rem;
}

input[type="file"] {
  background: #fff8eb;
  padding: 0.52rem 0.6rem;
}

input[type="range"] {
  padding: 0;
  accent-color: #7d6333;
  background: transparent;
  border: 0;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid #c8ae67;
  outline-offset: 2px;
}

button {
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 0.82rem 0.9rem;
  cursor: pointer;
  transition: background 120ms ease;
}

button:hover {
  background: var(--accent-hover);
}

#message {
  min-height: 1.3rem;
  margin: 0.8rem 0 0;
  font-size: 0.95rem;
}

.preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.qr-frame {
  width: min(520px, 100%);
  aspect-ratio: 1 / 1;
  border-radius: 18px;
  background:
    linear-gradient(145deg, #f4da9d, #e2bd74),
    repeating-linear-gradient(
      12deg,
      rgba(116, 78, 27, 0.09) 0px,
      rgba(116, 78, 27, 0.09) 2px,
      rgba(255, 255, 255, 0) 2px,
      rgba(255, 255, 255, 0) 10px
    );
  border: 1px solid #ceb788;
  padding: 1.1rem;
}

canvas {
  width: 100%;
  height: 100%;
  border-radius: 14px;
  background: transparent;
}

#download-btn {
  width: min(280px, 100%);
}

@media (max-width: 840px) {
  .app {
    margin: 1.4rem auto;
    grid-template-columns: 1fr;
  }
}