:root {
  --border-color: #14532d;
  --border-width: 8px;
  --card-w: 320px;
  --card-h: 460px;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "MS PMincho", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px;
  background: #f5f1e8;
  color: #222;
  font-family: var(--serif);
}

header {
  margin-bottom: 16px;
}

header h1 {
  margin: 0 0 4px 0;
  font-size: 22px;
  font-weight: 700;
}

.hint {
  margin: 0;
  color: #666;
  font-size: 13px;
}

#cards {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.pair {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

/* ===== 共通カード枠 ===== */
.card {
  border: var(--border-width) solid var(--border-color);
  background: #fffaf0;
  font-family: var(--serif);
  position: relative;
}

/* ===== 読み札 (yomi) ===== */
.yomi {
  width: var(--card-w);
  height: var(--card-h);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}

.yomi:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.yomi-upper {
  flex: 1 1 auto;
  padding: 14px 12px 8px;
  writing-mode: vertical-rl;
  overflow: hidden;
}

.yomi-upper .col {
  display: block;
  font-size: 30px;
  line-height: 1.4;
  letter-spacing: 0.05em;
  white-space: nowrap;
  /* in vertical-rl, block-end is the left edge — so this puts a gap
     between each column and the next column to its left. */
  margin-block-end: 10px;
}

.yomi-upper .col:last-child {
  margin-block-end: 0;
}

.yomi-upper .col.author {
  font-size: 18px;
  color: rgba(0, 0, 0, 0.55);
}

.yomi-lower {
  flex: 0 0 auto;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.yomi-lower img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
  object-fit: contain;
}

/* ===== 取り札 (tori) ===== */
.tori {
  width: var(--card-w);
  height: var(--card-h);
  padding: 20px 16px;
  background: #fffaf0;
}

.tori-grid {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(5, 1fr);
  gap: 4px;
}

.tori-grid .ch {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  line-height: 1;
  font-family: var(--serif);
  color: #111;
}

/* ===== ローディング・エラー ===== */
.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(0, 0, 0, 0.35);
  font-size: 12px;
  width: 100%;
  height: 100%;
}

.error {
  color: #b00020;
  font-size: 12px;
  padding: 8px;
}