:root {
  --bg: #F5F8FF;
  --card: #FFFFFF;
  --ink: #14213D;
  --sub: #5B6785;
  --blue: #2F5BFF;
  --blue-soft: #E8EEFF;
  --blue-line: #BFD0FF;
  --line: #DCE4F7;
  --shadow: 0 6px 20px rgba(47, 91, 255, .10);
  --c-business: #2F5BFF;
  --c-marketing: #7A5CFF;
  --c-web: #12A8B8;
  --c-social: #E0457B;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
}
body.lock { overflow: hidden; }

button { font: inherit; color: inherit; }
.srOnly {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---- 全体（スマホは1列） ---- */
.app { display: block; }

.side { padding: 16px 16px 4px; }
.brand { font-size: 1.25rem; font-weight: 800; line-height: 1.3; color: var(--blue); }
.brand br { display: none; }

.nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.navHead { display: none; }
.navItem {
  padding: 8px 16px;
  font-size: .9rem; font-weight: 700; color: var(--blue);
  background: var(--card);
  border: 2px solid var(--blue-soft);
  border-radius: 999px;
  cursor: pointer;
}
.navItem[aria-pressed="true"] { color: #fff; background: var(--blue); border-color: var(--blue); }
.navItem:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }

.top { display: flex; gap: 10px; align-items: center; padding: 12px 16px 0; }
.search { flex: 1; min-width: 0; }
.search input {
  width: 100%;
  padding: 13px 18px;
  font-size: 1rem;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow);
  outline: none;
  -webkit-appearance: none;
}
.search input:focus { border-color: var(--blue); }
.randomBtn {
  flex: none;
  padding: 11px 16px;
  font-size: .85rem; font-weight: 700; color: var(--blue);
  background: var(--card);
  border: 2px solid var(--blue-soft);
  border-radius: 999px;
  box-shadow: var(--shadow);
  cursor: pointer;
  white-space: nowrap;
}
.randomBtn:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }

.main { padding: 16px 16px 0; }
.head h1 { margin: 0; font-size: 1.6rem; line-height: 1.3; font-weight: 800; }
.viewDesc { margin: 4px 0 0; color: var(--sub); font-size: .9rem; }
.count { margin: 8px 0 14px; color: var(--sub); font-size: .85rem; }
.empty {
  margin: 8px 0 24px; padding: 28px 20px; text-align: center;
  background: var(--card); border-radius: 20px; box-shadow: var(--shadow); color: var(--sub);
}

/* ---- カード ---- */
.list { display: grid; grid-template-columns: 1fr; gap: 12px; }
.card {
  position: relative;
  background: var(--card);
  border: 2px solid transparent;
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow-wrap: anywhere;
}
.card.selected { background: var(--blue-soft); border-color: var(--blue-line); }
.cardOpen {
  display: block; width: 100%;
  padding: 18px 52px 18px 20px;
  text-align: left;
  background: none; border: 0; border-radius: 20px;
  cursor: pointer;
}
.cardOpen:focus-visible { outline: 3px solid var(--blue); outline-offset: -3px; }
.cardName { display: block; font-size: 1.4rem; font-weight: 800; line-height: 1.35; color: var(--blue); }
.cardReading { display: block; margin-top: 2px; color: var(--sub); font-size: .85rem; }
.cardSummary { display: block; margin-top: 8px; font-size: .92rem; color: var(--ink); }

.star {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  color: #98A4C4;
  background: none; border: 0; border-radius: 50%;
  cursor: pointer;
}
.star.on { color: var(--blue); }
.star:hover { background: var(--blue-soft); }
.star:focus-visible { outline: 3px solid var(--blue); outline-offset: 0; }
.card .star { position: absolute; top: 8px; right: 8px; }

/* ---- 詳細パネル（スマホは下から出る画面） ---- */
.detail {
  display: none;
  position: fixed; inset: 0; z-index: 20;
  padding: 16px 16px 40px;
  background: var(--card);
  overflow-y: auto;
}
.detail.open { display: block; }
.detailEmpty { margin: 0; color: var(--sub); }
.closeBtn {
  margin-bottom: 12px; padding: 8px 18px;
  font-size: .9rem; font-weight: 700; color: var(--blue);
  background: var(--blue-soft); border: 0; border-radius: 999px; cursor: pointer;
}
.detailHead { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; margin-bottom: 14px; overflow-wrap: anywhere; }
.detailHead h2 { margin: 0; font-size: 2rem; line-height: 1.35; font-weight: 800; }
.tag {
  display: inline-block; margin: 0 0 6px; padding: 2px 10px;
  font-size: .75rem; font-weight: 700; color: var(--blue);
  background: var(--blue-soft); border-radius: 999px;
}
.reading { margin: 0; color: var(--sub); font-size: .85rem; }
.block { margin: 0 0 12px; padding: 14px 16px; background: var(--bg); border-radius: 16px; overflow-wrap: anywhere; }
.block b, .related b { display: block; margin-bottom: 4px; font-size: .78rem; color: var(--blue); letter-spacing: .04em; }
.block p { margin: 0; font-size: .95rem; }
.related { margin-top: 16px; }
.relatedRow { display: flex; flex-wrap: wrap; gap: 8px; }
.relatedChip {
  padding: 5px 14px;
  font-size: .85rem; font-weight: 700; color: var(--blue); text-align: left;
  background: var(--card); border: 2px solid var(--blue-soft); border-radius: 999px;
  cursor: pointer; overflow-wrap: anywhere;
}
.relatedChip:hover { background: var(--blue-soft); }

/* ---- フッター（お問い合わせ・SNS） ---- */
.foot { padding: 32px 0 56px; text-align: center; }
.contactBtn {
  display: inline-block; padding: 14px 28px;
  color: #fff; background: var(--blue); font-weight: 700; text-decoration: none;
  border-radius: 999px; box-shadow: var(--shadow);
}
.contactBtn:hover { filter: brightness(1.08); }
.contactBtn:focus-visible, .snsCat:focus-visible, .snsLink:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
.snsBox { text-align: center; margin: 28px 0 0; line-height: 1.4; }
.snsCat { display: inline-block; }
.snsCat img { display: block; height: auto; }
.snsLink { font-weight: 400; font-size: .85rem; color: var(--ink); text-decoration: none; }
.snsLink:hover { text-decoration: underline; }

/* ---- 中くらい：カード2列 ---- */
@media (min-width: 640px) {
  .list { grid-template-columns: 1fr 1fr; }
}

/* ---- パソコン：左メニュー＋一覧＋右の詳細パネル ---- */
@media (min-width: 1000px) {
  .app {
    display: grid;
    grid-template-columns: 230px minmax(0, 1fr) 360px;
    min-height: 100vh;
  }
  .side {
    position: sticky; top: 0; align-self: start;
    height: 100vh; overflow-y: auto;
    padding: 24px 16px;
    background: var(--card);
    border-right: 1px solid var(--line);
  }
  .brand { font-size: 1.35rem; }
  .brand br { display: inline; }
  .nav { display: block; margin-top: 24px; }
  .navItem {
    display: block; width: 100%; margin-bottom: 4px;
    padding: 10px 14px; text-align: left;
    border: 0; border-radius: 12px; color: var(--ink);
    background: none;
  }
  .navItem:hover { background: var(--bg); }
  .navItem[aria-pressed="true"] { color: var(--blue); background: var(--blue-soft); }
  .navHead { display: block; margin: 20px 14px 8px; font-size: .78rem; font-weight: 700; color: var(--sub); }
  .navItem.cat::before {
    content: ""; display: inline-block; width: 10px; height: 10px; margin-right: 10px;
    border-radius: 50%; background: var(--blue);
  }
  .cat-marketing::before { background: var(--c-marketing); }
  .cat-web::before { background: var(--c-web); }
  .cat-social::before { background: var(--c-social); }

  .top { padding: 20px 28px 0; }
  .main { padding: 24px 28px 0; }
  .head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px; }
  .head h1 { font-size: 1.9rem; }
  .viewDesc { order: 3; flex-basis: 100%; margin: 0; }
  .count { margin: 0 0 0 auto; }
  .head + .empty, .head { margin-bottom: 16px; }

  .detail {
    display: block; position: sticky; top: 0; align-self: start;
    height: 100vh; z-index: auto;
    padding: 28px 24px 40px;
    border-left: 1px solid var(--line);
  }
  .closeBtn { display: none; }
  body.lock { overflow: auto; }
}

/* ---- スライドで学ぶ ---- */
[hidden] { display: none !important; }

.stageChips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.stageChip {
  padding: 6px 14px;
  font-size: .85rem; font-weight: 700; color: var(--blue);
  background: var(--card); border: 2px solid var(--blue-soft); border-radius: 999px;
  cursor: pointer;
}
.stageChip[aria-pressed="true"] { color: #fff; background: var(--blue); border-color: var(--blue); }
.stageChip:focus-visible, .slideBtn:focus-visible, .bookLink:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }

.progress { height: 8px; margin-bottom: 14px; background: var(--blue-soft); border-radius: 999px; overflow: hidden; }
.progressFill { height: 100%; background: var(--blue); border-radius: 999px; transition: width .2s; }

.slide {
  padding: 24px 22px;
  background: var(--card);
  border-radius: 24px;
  box-shadow: var(--shadow);
  overflow-wrap: anywhere;
}
.slideStage { margin: 0 0 6px; font-size: .85rem; font-weight: 700; color: var(--blue); }
.slideTitle { margin: 0 0 16px; font-size: 1.6rem; line-height: 1.4; font-weight: 800; }
.slidePoints { margin: 0 0 18px; padding: 0; list-style: none; }
.slidePoints li {
  position: relative;
  margin-bottom: 10px; padding: 12px 14px 12px 38px;
  background: var(--bg); border-radius: 14px;
  font-size: 1.02rem;
}
.slidePoints li::before {
  content: ""; position: absolute; left: 16px; top: 1.2em;
  width: 10px; height: 10px; border-radius: 50%; background: var(--blue);
}
.slideBook { margin: 16px 0 0; font-size: .9rem; color: var(--sub); }
.bookLink { color: var(--blue); font-weight: 700; text-decoration: none; }
.bookLink:hover { text-decoration: underline; }

.slideNav { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 16px 0 8px; }
.slideBtn {
  min-width: 96px; padding: 12px 20px;
  font-size: 1rem; font-weight: 700; color: var(--blue);
  background: var(--card); border: 2px solid var(--blue-soft); border-radius: 999px;
  cursor: pointer;
}
.slideBtn.primary { color: #fff; background: var(--blue); border-color: var(--blue); }
.slideBtn:disabled { opacity: .4; cursor: default; }
.slideCount { font-weight: 700; color: var(--sub); }

.shelf { margin-top: 28px; padding: 18px 20px; background: var(--card); border-radius: 20px; box-shadow: var(--shadow); }
.shelf h3 { margin: 0 0 8px; font-size: 1rem; }
.shelfList { margin: 0; padding: 0; list-style: none; }
.shelfList li { padding: 4px 0; }
.note { margin: 12px 0 0; font-size: .78rem; color: var(--sub); }

.adNote { margin: 16px 0 0; font-size: .75rem; color: var(--sub); }

@media (min-width: 1000px) {
  .slidesView .app { grid-template-columns: 230px minmax(0, 1fr); }
  .slidesView .detail { display: none; }
  .slides { max-width: 820px; }
  .slideTitle { font-size: 2rem; }
}

.legal { margin: 14px 0 0; font-size: .8rem; }
.legal a { color: var(--sub); }