@import url("https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@400;500;700;800;900&family=Yomogi&display=swap");

:root{
  --bg: #fff7fb;
  --card: rgba(255,255,255,0.92);
  --card2: rgba(255,255,255,0.72);
  --text: #3a2d3b;
  --muted: #7c6a7e;
  --line: rgba(220,198,225,0.65);
  --accent: #ff8fc7;
  --accent2: #78d8d2;
  --shadow: 0 12px 30px rgba(141, 105, 142, 0.18);

  --radius: 18px;
  --radius2: 14px;
  --max: 1120px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "M PLUS Rounded 1c", "Zen Maru Gothic", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --display: "Yomogi", "M PLUS Rounded 1c", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
}

:root[data-theme="light"]{
  --bg: #fff7fb;
  --card: rgba(255,255,255,0.94);
  --card2: rgba(255,255,255,0.78);
  --text: #3a2d3b;
  --muted: #7c6a7e;
  --line: rgba(220,198,225,0.65);
  --accent: #ff8fc7;
  --accent2: #78d8d2;
  --shadow: 0 14px 32px rgba(141, 105, 142, 0.18);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(255,143,199,0.25), transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(120,216,210,0.25), transparent 55%),
    radial-gradient(800px 500px at 40% 100%, rgba(255,201,236,0.18), transparent 60%),
    var(--bg);
  line-height: 1.75;
}

a{ color: inherit; }
.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px;
}

#progressBar{
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 9999;
}

.siteHeader{
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  background: rgba(255,255,255,0.86);
  border-bottom: 1px solid var(--line);
}
:root[data-theme="light"] .siteHeader{
  background: rgba(255,255,255,0.9);
}
.headerInner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 12px 0;
}
.brand{
  text-decoration:none;
  font-weight: 800;
  letter-spacing: 0.02em;
  font-family: var(--display);
}
.headerNav{
  display:flex;
  gap: 10px;
}

.layout{
  display:flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px 0 90px;
}

.contentCard, .tocCard{
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card), transparent 120%);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contentCard{
  padding: 22px 22px 6px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(56px, 1fr));
  grid-auto-flow: row dense;
  gap: 8px;
}
.contentCard > *{
  grid-column: 1 / -1;
}
.tocCard{
  position: relative;
  top: auto;
  height: fit-content;
  padding: 16px;
}

.hero{
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 14px;
}
.kicker{
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
h1{
  font-family: var(--display);
  margin: 0 0 8px;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.25;
}
.lede{
  margin: 0 0 12px;
  color: var(--muted);
}

.metaRow{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0 10px;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.7));
  font-size: 13px;
}
.pill.link{
  text-decoration:none;
}
.pill.link:hover{ border-color: rgba(154,230,255,0.45); }

.noteBox{
  margin: 12px 0 8px;
  padding: 14px 14px;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: var(--card2);
}
.noteTitle{
  margin: 0 0 6px;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.noteText{
  margin: 0;
  color: var(--muted);
}

section{
  padding: 10px 0;
}
h2{
  margin: 18px 0 8px;
  font-size: 18px;
  line-height: 1.35;
  font-family: var(--display);
}
.secToggle{
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.secToggle:focus-visible{
  outline: 2px solid rgba(255,143,199,0.6);
  outline-offset: 4px;
  border-radius: 10px;
}
.secNum{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.7));
  font-weight: 900;
  flex: 0 0 auto;
}
.secTitle{
  flex: 1 1 auto;
}
.secIcon{
  margin-left: auto;
  color: var(--muted);
  font-size: 14px;
}
.sectionBody{
  padding-left: 2px;
}
section.is-collapsed{
  padding: 6px 0;
  grid-column: span 1;
}
section.is-collapsed .secToggle{
  justify-content: center;
}
section.is-collapsed .sectionBody{
  display: none;
}
section.is-collapsed .secTitle,
section.is-collapsed .secIcon{
  display: none;
}
h3{
  margin: 12px 0 6px;
  font-size: 15px;
  line-height: 1.35;
  color: #5b3d61;
  font-family: var(--display);
}
:root[data-theme="light"] h3{ color: #5b3d61; }

p{ margin: 8px 0; }
ul{
  margin: 8px 0 8px 18px;
  padding: 0;
  color: var(--muted);
}
strong{
  color: var(--text);
}

.grid3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 8px 0 10px;
}
.miniCard{
  border: 1px solid var(--line);
  background: var(--card2);
  border-radius: var(--radius2);
  padding: 12px;
}
.miniCard p{ color: var(--muted); }

.compare{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 10px 0 8px;
}
.compareCol{
  border: 1px solid var(--line);
  border-radius: var(--radius2);
  background: var(--card2);
  padding: 12px;
}
.compareTitle{
  margin: 0 0 6px;
  font-weight: 900;
}
.compareCol ul{
  margin: 6px 0 0 18px;
  color: var(--muted);
}

.tocHead{
  padding: 6px 4px 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 10px;
}
.tocTitle{
  margin: 0;
  font-weight: 900;
}
.tocSub{
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.toc a{
  display:block;
  text-decoration:none;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  color: var(--muted);
}
.toc a:hover{
  background: rgba(255,143,199,0.12);
  border-color: var(--line);
  color: var(--text);
}
.toc a.active{
  background: linear-gradient(90deg, rgba(255,143,199,0.25), rgba(120,216,210,0.22));
  border-color: rgba(255,143,199,0.45);
  color: var(--text);
}

.shareBox{
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.shareTitle{
  margin: 0 0 10px;
  font-weight: 900;
}
.shareActions{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.shareActions .btn{
  text-decoration: none;
}

.btn{
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
  color: var(--text);
  padding: 10px 12px;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 700;
}
.btn:hover{
  border-color: rgba(255,143,199,0.6);
}
.btn.ghost{
  padding: 9px 10px;
  background: transparent;
}
.muted{ color: var(--muted); }
.small{ font-size: 12px; }

.footer{
  border-top: 1px dashed var(--line);
  margin-top: 14px;
  padding-top: 14px;
}

.btnTop{
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card2);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease;
}
.btnTop.show{
  opacity: 1;
  transform: translateY(0px);
}

.hideSm{ display: inline; }

@media (max-width: 980px){
  .layout{ flex-direction: column; }
  .tocCard{ position: relative; top: auto; }
}
@media (max-width: 520px){
  .contentCard{ padding: 16px 14px 6px; }
  .grid3{ grid-template-columns: 1fr; }
  .compare{ grid-template-columns: 1fr; }
  .hideSm{ display: none; }
}