/* ===== JavaScript サンドボックス スタイル ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  background: #f4f6fb;
  color: #222;
  padding: 24px 16px 60px;
  line-height: 1.6;
}

.header {
  max-width: 760px;
  margin: 0 auto 32px;
  text-align: center;
}
.header h1 { font-size: 1.9rem; margin-bottom: 12px; }
.header .lead { font-size: 1rem; color: #444; }
.header .note {
  margin-top: 14px;
  font-size: 0.85rem;
  background: #fff8dc;
  border: 1px solid #f0e0a0;
  border-radius: 10px;
  padding: 10px 14px;
  display: inline-block;
}
code {
  background: #eaeef5;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
}

.lessons {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* 1つのレッスンカード */
.card {
  background: #fff;
  border: 1px solid #e2e6ee;
  border-radius: 16px;
  padding: 22px 22px 20px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}
.card h2 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}
.card .desc {
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 14px;
}

/* コードを書くところ */
.editor {
  width: 100%;
  min-height: 120px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  padding: 14px;
  border: 1px solid #d3d9e4;
  border-radius: 10px;
  background: #1e222a;
  color: #e6e6e6;
  resize: vertical;
  tab-size: 2;
}
.editor:focus { outline: 2px solid #4a90e2; }

/* ボタンの行 */
.buttons {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}
button {
  font-size: 0.95rem;
  font-weight: bold;
  padding: 9px 20px;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.12s, opacity 0.12s;
}
button:hover { transform: scale(1.04); }
.run-btn { background: #2e7d32; color: #fff; }
.clear-btn { background: #e0e4ec; color: #333; }

/* 実行結果の表示エリア */
.output {
  margin-top: 14px;
  min-height: 44px;
  background: #0f1115;
  color: #a8e6a3;
  border-radius: 10px;
  padding: 12px 14px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.output .placeholder { color: #66707d; }
.output .err { color: #ff6b6b; }
.output .line { display: block; }

.back {
  max-width: 760px;
  margin: 34px auto 0;
  text-align: center;
  font-size: 0.9rem;
}
.back a { color: #2e7d32; }