:root {
  --bg: #f7f4ef;
  --surface: #ffffff;
  --text: #1f1a13;
  --muted: #665f54;
  --line: #ddd4c8;
  --accent: #c18f2e;
  --accent-soft: #f4e5c8;
  --shadow: 0 8px 24px rgba(41, 31, 16, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 0 0, #fff8ea, var(--bg) 48%), var(--bg);
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
  padding: 20px 0 28px;
}

.hero {
  margin-bottom: 16px;
}

h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
}

h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

#updatedAt {
  margin: 8px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 12px;
}

canvas {
  width: 100% !important;
  height: 280px !important;
}

.qr-card {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.url-text {
  margin: 0;
  color: var(--muted);
  word-break: break-all;
}

#qrImage {
  width: min(230px, 60vw);
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 8px;
}

.error {
  color: #9b2d2d;
  font-weight: 600;
  margin-top: 12px;
}

@media (max-width: 980px) {
  .grid {
    grid-template-columns: 1fr;
  }

  canvas {
    height: 240px !important;
  }
}