/* ============= Ivory & Ink Minimal Theme ============= */
:root{
  --ivory:#f6f3ec;
  --paper:#fbf8f1;
  --ink:#1a1a18;
  --muted:#7d786d;
  --line:#e0dacd;
  --bronze:#8c6a3f;
  --bronze-soft:#eee5d6;
  --soft:#f1ece2;
  --good:#42624d;
  --warn:#9a7337;
  --bad:#9a4a3a;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ivory);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  font-size:16px;
  font-weight:300;
  line-height:1.85;
}
.serif{font-family:"Georgia","Songti SC","Noto Serif SC","SimSun",serif}
b,strong{font-weight:600}
a{color:var(--bronze); text-decoration:none}
a:hover{text-decoration:underline}
p{margin:14px 0}

/* ---------- Top Bar ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(246,243,236,.96);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}
.topbar .wrap{
  min-height:68px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.topbar .brand{
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  color:var(--ink);
  font-size:16px;
  letter-spacing:.5px;
  white-space:nowrap;
}
.topbar .brand .mp{
  margin-left:8px;
  color:var(--muted);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:10px;
  font-weight:300;
  letter-spacing:3px;
  text-transform:uppercase;
}
.topbar nav{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:18px;
}
.topbar nav a{
  color:var(--muted);
  font-size:11px;
  letter-spacing:2px;
  text-transform:uppercase;
}
.topbar nav a:hover,
.topbar nav a.active{
  color:var(--bronze);
  text-decoration:none;
}

/* ---------- Layout ---------- */
.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 30px;
}
.layout{
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:42px;
  align-items:start;
}
main{padding:34px 0 70px}

/* ---------- Hero ---------- */
header.hero{
  padding:70px 0 60px;
  background:var(--ivory);
  color:var(--ink);
  border-bottom:1px solid var(--line);
}
header.hero .maple{display:none}
.tag{
  display:block;
  margin:0 0 24px;
  color:var(--bronze);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:13px;
  font-style:normal;
  letter-spacing:4px;
  text-transform:uppercase;
}
header.hero h1{
  max-width:840px;
  margin:0 0 20px;
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:48px;
  font-weight:400;
  line-height:1.25;
  letter-spacing:0;
}
header.hero h1 .em{color:var(--ink)}
header.hero p.sub{
  max-width:760px;
  margin:0;
  color:var(--muted);
  font-size:18px;
  font-weight:300;
}
.meta-row{
  margin-top:34px;
  display:flex;
  flex-wrap:wrap;
  gap:22px;
}
.meta-row .m{
  color:var(--muted);
  font-size:12px;
  letter-spacing:2px;
  text-transform:uppercase;
}

/* ---------- TOC ---------- */
.toc{
  position:sticky;
  top:94px;
  max-height:calc(100vh - 114px);
  overflow:auto;
  padding:0 0 18px;
  background:transparent;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
  font-size:14px;
}
.toc h4{
  margin:18px 0 10px;
  color:var(--bronze);
  font-size:11px;
  font-weight:400;
  letter-spacing:4px;
  text-transform:uppercase;
}
.toc ol{list-style:none; margin:0; padding:0}
.toc li{margin:0; border-top:1px solid var(--line)}
.toc li:first-child{border-top:0}
.toc a{
  display:block;
  padding:9px 0;
  color:var(--muted);
}
.toc a:hover{
  color:var(--ink);
  text-decoration:none;
}

/* ---------- Sections ---------- */
section.card{
  margin:0;
  padding:54px 0;
  background:transparent;
  border:0;
  border-bottom:1px solid var(--line);
  border-radius:0;
  box-shadow:none;
  scroll-margin-top:92px;
}
section.card:first-child{border-top:1px solid var(--ink)}
section.card > h2{
  margin:0 0 18px;
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:30px;
  font-weight:400;
  line-height:1.35;
  letter-spacing:0;
  display:flex;
  gap:12px;
  align-items:baseline;
}
section.card > h2 .num{
  min-width:auto;
  color:var(--bronze);
  font-family:"Georgia",serif;
  font-size:13px;
  font-weight:400;
  letter-spacing:4px;
  text-transform:uppercase;
}
.lead{
  margin:14px 0 18px;
  color:var(--muted);
  font-size:16px;
}
h3.sub{
  margin:30px 0 10px;
  padding:0;
  color:var(--muted);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:13px;
  font-weight:400;
  letter-spacing:2px;
  text-transform:uppercase;
}
h3.sub::before{content:""; display:none}
ul.clean{
  margin:14px 0;
  padding-left:0;
  list-style:none;
}
ul.clean li{
  position:relative;
  margin:12px 0;
  padding-left:22px;
}
ul.clean li::before{
  content:"";
  position:absolute;
  left:0;
  top:13px;
  width:6px;
  height:6px;
  background:var(--bronze);
  border-radius:50%;
}

/* ---------- Tables ---------- */
.tbl-scroll{
  margin:24px 0;
  overflow-x:auto;
  border:0;
  border-radius:0;
}
table{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:15px;
}
thead th{
  padding:12px 4px;
  background:transparent;
  color:var(--muted);
  border-bottom:1px solid var(--ink);
  text-align:left;
  font-size:11px;
  font-weight:400;
  letter-spacing:2px;
  text-transform:uppercase;
  white-space:nowrap;
}
tbody td{
  padding:14px 4px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
tbody tr:last-child td{border-bottom:1px solid var(--line)}
tbody tr:nth-child(even){background:transparent}
td .ok,.ok{color:var(--good); font-weight:600}
td .no,.no{color:var(--bad); font-weight:600}
td .mid,.mid{color:var(--warn); font-weight:600}

/* ---------- Notes & Callouts ---------- */
.box{
  margin:24px 0;
  padding:2px 0 2px 22px;
  background:transparent;
  border:0;
  border-left:2px solid var(--bronze);
  border-radius:0;
  color:var(--ink);
  font-size:15px;
}
.box .bt{
  display:block;
  margin:0 0 6px;
  color:var(--bronze);
  font-size:11px;
  font-weight:400;
  letter-spacing:2px;
  text-transform:uppercase;
}
.box.good,
.box.warn,
.box.bad,
.box.info{
  background:transparent;
  color:var(--ink);
}
.box.good{border-left-color:var(--good)}
.box.warn{border-left-color:var(--warn)}
.box.bad{border-left-color:var(--bad)}
.box.info{border-left-color:var(--bronze)}
.box.good .bt{color:var(--good)}
.box.warn .bt{color:var(--warn)}
.box.bad .bt{color:var(--bad)}
.box.info .bt{color:var(--bronze)}

/* ---------- Component Groups ---------- */
.pills,
.flow{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:16px 0;
}
.pill,
.flow .stp{
  padding:7px 11px;
  color:var(--ink);
  background:var(--soft);
  border:1px solid var(--line);
  border-radius:3px;
  font-size:13px;
  font-weight:400;
}
.flow .stp small{
  color:var(--muted);
  font-weight:300;
}
.flow .arw{
  color:var(--bronze);
  font-weight:400;
}
.stats{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:18px;
  margin:24px 0;
}
.stat{
  padding:18px 0;
  background:transparent;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
  border-radius:0;
}
.stat .big{
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:30px;
  font-weight:400;
  letter-spacing:0;
  line-height:1.2;
}
.stat .lbl{
  margin-top:8px;
  color:var(--muted);
  font-size:13px;
  line-height:1.65;
}
.two-col{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:28px;
  margin:18px 0;
}
.kbd{
  padding:1px 6px;
  background:var(--soft);
  border:1px solid var(--line);
  border-radius:3px;
  font-family:"SF Mono",ui-monospace,monospace;
  font-size:13px;
}
.hl{
  padding:0 3px;
  background:var(--bronze-soft);
}
.badge{
  display:inline-block;
  margin-left:6px;
  padding:1px 7px;
  border:1px solid var(--line);
  border-radius:3px;
  font-size:11px;
  font-weight:600;
  letter-spacing:1px;
}
.badge.g{color:var(--good); background:transparent}
.badge.y{color:var(--warn); background:transparent}
.badge.r{color:var(--bad); background:transparent}

/* ---------- Q&A ---------- */
.qa{
  margin:24px 0;
  background:transparent;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
  border-radius:0;
  overflow:visible;
}
.qa .qq{
  display:flex;
  gap:12px;
  align-items:flex-start;
  padding:16px 0;
  background:transparent;
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:20px;
  font-weight:400;
  line-height:1.45;
}
.qa .qq .n{
  flex:0 0 auto;
  min-width:24px;
  color:var(--bronze);
  font-family:"Georgia",serif;
  font-size:13px;
  font-weight:400;
  letter-spacing:2px;
}
.qa .ans{padding:0 0 18px}
.qa .ans .say{
  margin:0 0 14px;
  padding:2px 0 2px 18px;
  background:transparent;
  border-left:2px solid var(--bronze);
  border-radius:0;
  font-weight:600;
}
.qa .reasons{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  margin:0;
}
.qa .r{
  color:var(--muted);
  font-size:14px;
}
.qa .r b{color:var(--bronze)}

/* ---------- Hub Landing ---------- */
.hub-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:30px;
  margin:34px 0 0;
}
.hub-card{
  display:block;
  position:relative;
  padding:28px 0;
  color:var(--ink);
  background:transparent;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
  border-radius:0;
  transition:color .18s, border-color .18s, transform .18s;
}
.hub-card::before{display:none}
.hub-card:hover{
  color:var(--ink);
  border-top-color:var(--bronze);
  text-decoration:none;
  transform:translateY(-2px);
  box-shadow:none;
}
.hub-card .ic{
  color:var(--bronze);
  font-size:24px;
}
.hub-card h3{
  margin:14px 0 8px;
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:24px;
  font-weight:400;
  line-height:1.35;
}
.hub-card p{
  margin:0;
  color:var(--muted);
  font-size:15px;
}
.hub-card ul{
  margin:14px 0 0;
  padding-left:0;
  list-style:none;
  color:var(--muted);
  font-size:13.5px;
}
.hub-card ul li{
  margin:7px 0;
  padding-left:18px;
  position:relative;
}
.hub-card ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:12px;
  width:5px;
  height:5px;
  background:var(--bronze);
  border-radius:50%;
}
.hub-card .go{
  margin-top:18px;
  color:var(--bronze);
  font-size:12px;
  font-weight:400;
  letter-spacing:2px;
  text-transform:uppercase;
}

/* ---------- Quiz ---------- */
.quiz-meta{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:18px;
  margin:22px 0 0;
}
.quiz-meta label{
  display:flex;
  flex-direction:column;
  gap:8px;
  color:var(--muted);
  font-size:11px;
  letter-spacing:2px;
  text-transform:uppercase;
}
.quiz-meta input{
  width:100%;
  padding:10px 0;
  color:var(--ink);
  background:transparent;
  border:0;
  border-bottom:1px solid var(--line);
  border-radius:0;
  font:inherit;
  letter-spacing:0;
  text-transform:none;
}
.quiz-meta input:focus{
  outline:0;
  border-bottom-color:var(--bronze);
}
.quiz-form{margin:0}
.quiz-question{
  margin:28px 0;
  padding:24px 0;
  border:0;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
}
.quiz-question legend{
  display:flex;
  gap:12px;
  align-items:baseline;
  width:100%;
  margin:0;
  padding:0;
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:21px;
  font-weight:400;
  line-height:1.45;
}
.quiz-question legend span{
  color:var(--bronze);
  font-family:"Georgia",serif;
  font-size:13px;
  letter-spacing:2px;
}
.quiz-question-meta{
  margin:8px 0 16px;
  color:var(--muted);
  font-size:11px;
  letter-spacing:2px;
  text-transform:uppercase;
}
.quiz-options{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px 20px;
}
.quiz-option{
  display:flex;
  gap:10px;
  align-items:flex-start;
  min-height:42px;
  padding:9px 0;
  color:var(--ink);
  cursor:pointer;
}
.quiz-option input{
  margin-top:7px;
  accent-color:var(--bronze);
}
.quiz-feedback{
  min-height:22px;
  margin-top:14px;
  color:var(--muted);
  font-size:14px;
}
.quiz-question.is-correct .quiz-feedback{color:var(--good)}
.quiz-question.is-wrong .quiz-feedback{color:var(--bad)}
.quiz-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:24px;
}
.quiz-actions button{
  min-height:42px;
  padding:9px 18px;
  color:var(--ivory);
  background:var(--ink);
  border:1px solid var(--ink);
  border-radius:3px;
  font:inherit;
  font-size:13px;
  letter-spacing:2px;
  text-transform:uppercase;
  cursor:pointer;
}
.quiz-actions button[type="button"]{
  color:var(--ink);
  background:transparent;
}
.quiz-actions button:hover{
  border-color:var(--bronze);
  background:var(--bronze);
  color:var(--ivory);
}
.quiz-result-card[hidden]{display:none}
.result-summary table{
  margin-top:20px;
}
.question-results{
  margin-top:26px;
}
.question-results h3{
  margin:0 0 10px;
}
.question-result{
  padding:16px 0;
  border-top:1px solid var(--line);
}
.question-result:last-child{
  border-bottom:1px solid var(--line);
}
.question-result-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  margin-bottom:10px;
}
.question-result-title{
  margin:0;
  font-weight:600;
  line-height:1.55;
}
.question-result-score{
  flex:0 0 auto;
  color:var(--ink);
  font-weight:600;
  white-space:nowrap;
}
.question-result-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:10px 22px;
}
.question-result-item{
  min-width:0;
  color:var(--muted);
  font-size:14px;
  line-height:1.65;
  overflow-wrap:anywhere;
}
.question-result-item b{
  display:block;
  margin-bottom:2px;
  color:var(--ink);
  font-size:12px;
  font-weight:400;
  letter-spacing:1px;
}
.result-score{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:16px;
  padding:18px 0;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--line);
}
.result-score strong{
  color:var(--ink);
  font-family:"Georgia","Songti SC","Noto Serif SC",serif;
  font-size:42px;
  font-weight:400;
  line-height:1;
}
.result-score span{
  color:var(--muted);
  font-size:12px;
  letter-spacing:2px;
  text-transform:uppercase;
}
.result-score.pass span{color:var(--good)}
.result-score.fail span{color:var(--bad)}

/* ---------- Footer ---------- */
footer{
  padding:40px 0 80px;
  background:var(--ivory);
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:11px;
  letter-spacing:1px;
  text-transform:uppercase;
}
.disc{
  padding:0;
  background:transparent;
  border:0;
  color:var(--muted);
  font-size:12px;
  letter-spacing:0;
  line-height:1.8;
  text-transform:none;
}

.backtop{
  position:fixed;
  right:22px;
  bottom:22px;
  z-index:40;
  width:42px;
  height:42px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--ivory);
  background:var(--ink);
  border-radius:50%;
  font-size:18px;
  opacity:0;
  pointer-events:none;
  transition:.25s;
}
.backtop:hover{
  background:var(--bronze);
  text-decoration:none;
}
.backtop.show{
  opacity:1;
  pointer-events:auto;
}

@media(max-width:900px){
  .topbar .wrap{
    align-items:flex-start;
    flex-direction:column;
    gap:10px;
    padding-top:14px;
    padding-bottom:14px;
  }
  .topbar nav{
    justify-content:flex-start;
    gap:12px 16px;
  }
  .layout{grid-template-columns:1fr}
  .toc{display:none}
  header.hero{padding:54px 0 46px}
  header.hero h1{font-size:38px}
}

@media(max-width:680px){
  .wrap{padding:0 22px}
  .topbar .brand{font-size:15px}
  .topbar .brand .mp{display:block; margin:2px 0 0}
  .topbar nav a{font-size:10px}
  header.hero h1{font-size:32px}
  header.hero p.sub{font-size:16px}
  section.card{padding:42px 0}
  section.card > h2{font-size:25px}
  .two-col,
  .qa .reasons,
  .quiz-options{grid-template-columns:1fr}
  table{font-size:14px}
}