:root {
  --bg: #f6f3ee;
  --paper: #ffffff;
  --ink: #241f30;
  --ink-soft: #5b5470;
  --accent: #6a4fb6;
  --accent-2: #b86fb0;
  --accent-soft: #ece6f8;
  --rule: #e6dfd2;
  --warm: #f4ead7;
  --todo-bg: #fff3c4;
  --todo-ink: #7a5b00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #140f1f;
    --paper: #221b34;
    --ink: #efe9f6;
    --ink-soft: #b6aac8;
    --accent: #c7a6ff;
    --accent-2: #e89ad8;
    --accent-soft: #34275a;
    --rule: #382c52;
    --warm: #33264c;
    --todo-bg: #4a3a12;
    --todo-ink: #ffe6a0;
  }
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.85; font-size: 16px;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 40px 20px 80px; }
.paper {
  background: var(--paper); border-radius: 18px; padding: 44px 40px;
  box-shadow: 0 8px 24px rgba(20, 15, 31, 0.10), 0 2px 6px rgba(20, 15, 31, 0.06);
}
.hero { display: flex; align-items: center; gap: 14px; margin-bottom: 4px; }
.hero-mark {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  display: grid; place-items: center; font-size: 24px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 12px rgba(106, 79, 182, 0.4);
}
.app-name { font-size: 13px; color: var(--ink-soft); letter-spacing: .04em; }
h1 { font-size: 26px; margin: 2px 0 0; line-height: 1.4; }
h2 { font-size: 19px; margin: 36px 0 10px; padding-bottom: 6px; border-bottom: 2px solid var(--accent-soft); }
h3 { font-size: 16px; margin: 22px 0 6px; color: var(--accent); }
.updated { color: var(--ink-soft); font-size: 13px; margin: 14px 0 0; }
.lead { color: var(--ink-soft); margin-top: 18px; }
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
th, td { border: 1px solid var(--rule); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: var(--accent-soft); font-weight: 700; white-space: nowrap; }
ul, ol { padding-left: 1.3em; }
li { margin: 4px 0; }
.todo {
  background: var(--todo-bg); color: var(--todo-ink);
  padding: 1px 7px; border-radius: 6px; font-weight: 700; font-size: .92em;
  white-space: nowrap;
}
.note {
  margin-top: 28px; padding: 14px 16px; border-radius: 12px;
  background: var(--warm); color: var(--ink-soft); font-size: 13px;
}
.back { display: inline-block; margin-bottom: 18px; font-size: 14px; text-decoration: none; }
.back:hover { text-decoration: underline; }
.cards { display: grid; gap: 14px; margin-top: 26px; }
.card {
  display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--rule); border-radius: 14px; padding: 18px 20px;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 6px 18px rgba(106, 79, 182, .18); }
.card .t { font-size: 17px; font-weight: 700; }
.card .d { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }
.card .arrow { float: right; color: var(--accent); font-size: 18px; }
footer { text-align: center; color: var(--ink-soft); font-size: 12px; margin-top: 30px; }