:root {
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #8a5a44;
  --bg-soft: #faf6f1;
  --border: #e5ddd2;
  --radius: 10px;
  --max-width: 760px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--fg);
  line-height: 1.75;
  background: var(--bg-soft);
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header.cover {
  text-align: center;
  margin-bottom: 24px;
}

header.cover .page-title {
  font-size: 2rem;
  margin: 0 0 8px;
  padding-bottom: 0;
  border-bottom: none;
  color: var(--accent);
}

.lang-link {
  display: inline-block;
  font-size: 0.9rem;
  color: var(--accent);
  text-decoration: none;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
}
.lang-link:hover { background: var(--bg-soft); }

.cover-row {
  display: flex;
  align-items: stretch;
  gap: 14px;
  text-align: left;
}

.cover-row .cover-img {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  object-fit: contain;
}

/* 二维码贴在封面右侧，两张上下排列，整体与图片同高 */
.qr-grid-side {
  flex: 0 0 170px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 0;
}

.qr-grid-side .qr-card {
  flex: 1 1 0;
  min-height: 0;
  padding: 10px;
}

.qr-grid-side .qr-card .qr-img {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-grid-side .qr-card .qr-img img,
.qr-grid-side .qr-card .qr-img canvas {
  max-height: 100%;
  max-width: 100%;
  width: auto;
  height: auto;
}

.qr-grid-side .qr-card .qr-title {
  margin-top: 6px;
  font-size: 0.85rem;
}

.qr-grid-side .qr-card .qr-desc {
  display: none;
}

@media (max-width: 560px) {
  .cover-row { flex-direction: column; }
  .qr-grid-side {
    flex: 1 1 auto;
    flex-direction: row;
    width: 100%;
  }
  .qr-grid-side .qr-card .qr-img img,
  .qr-grid-side .qr-card .qr-img canvas {
    height: 120px;
    max-height: none;
  }
}

h1 {
  font-size: 1.6rem;
  margin: 2.2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  color: var(--accent);
}

h2 {
  font-size: 1.2rem;
  margin: 1.6rem 0 0.6rem;
  color: var(--fg);
}

p { margin: 0.6rem 0; }

img.content {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
  margin: 14px auto;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.image-pair {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin: 14px 0;
}

.image-pair img.content {
  height: clamp(100px, 32vw, 240px);
  width: auto;
  max-width: 100%;
  margin: 0;
}

@media (max-width: 480px) {
  .image-pair img.content { height: clamp(90px, 38vw, 150px); }
}

section.qrcodes {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

section.qrcodes h1 {
  margin-top: 0;
  border-bottom: none;
  text-align: center;
}

.qr-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-top: 12px;
}

.qr-card {
  text-align: center;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.qr-card a {
  display: block;
  text-decoration: none;
  color: inherit;
}

.qr-card img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  background: #fff;
  border-radius: 6px;
}

.qr-card .qr-title {
  font-weight: 600;
  margin-top: 12px;
  font-size: 1rem;
}

.qr-card .qr-desc {
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.5;
}

.qr-empty {
  color: var(--muted);
  text-align: center;
  padding: 12px;
  font-size: 0.9rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 48px;
}

@media (max-width: 480px) {
  .page { padding: 20px 14px 40px; }
  h1 { font-size: 1.4rem; }
  .qr-card img { width: 140px; height: 140px; }
}