/* Lumosvibe — warm daylight / home-learning journal look */
:root {
  --paper: #fbf6ec;
  --paper-2: #fffdf8;
  --ink: #2c2620;
  --ink-soft: #6b6154;
  --rule: #e6dcc8;
  --amber: #d98a2b;
  --amber-deep: #b9662a;
  --sage: #6f8a5f;
  --sage-soft: #eef1e6;
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --sans: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
}
a { color: var(--amber-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 22px; }

/* header */
.masthead { background: var(--paper-2); border-bottom: 1px solid var(--rule); }
.sunrule {
  height: 5px;
  background: linear-gradient(90deg, var(--amber) 0%, #f2c46a 45%, var(--sage) 100%);
}
.row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-text { font-family: var(--serif); font-size: 24px; letter-spacing: .04em; font-weight: 700; }
.brand-sun { width: 20px; height: 20px; border-radius: 50%; background: radial-gradient(circle at 40% 40%, #f4c469, var(--amber)); box-shadow: 0 0 0 4px #f6e3c3; }
.mainnav { display: flex; flex-wrap: wrap; gap: 16px; font-size: 15px; }
.mainnav a { color: var(--ink-soft); }
.mainnav a:first-child { color: var(--ink); }

/* opening */
.opening { padding: 54px 0 30px; border-bottom: 2px solid var(--rule); }
.kicker { text-transform: uppercase; letter-spacing: .18em; font-size: 12px; color: var(--amber-deep); margin: 0 0 10px; font-weight: 700; }
.opening h1 { font-family: var(--serif); font-size: clamp(30px, 5vw, 48px); line-height: 1.15; margin: 0 0 16px; max-width: 16ch; }
.opening-lede { font-size: 20px; color: var(--ink-soft); max-width: 62ch; margin: 0 0 18px; }
.opening-meta { font-size: 14px; color: var(--sage); letter-spacing: .04em; margin: 0; }
.opening-meta span { font-weight: 700; color: var(--sage); }

/* chapters */
.chapter { padding: 40px 0 8px; }
.chapter-head { border-left: 4px solid var(--amber); padding-left: 16px; margin-bottom: 20px; }
.chapter-no { margin: 0 0 4px; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--amber-deep); font-weight: 700; }
.chapter-head h2 { font-family: var(--serif); font-size: 28px; margin: 0 0 6px; }
.chapter-head h2 a { color: var(--ink); }
.chapter-blurb { margin: 0; color: var(--ink-soft); max-width: 68ch; }

.lesson-grid { list-style: none; margin: 0 0 8px; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.lesson-grid.wide { grid-template-columns: repeat(2, 1fr); margin-top: 22px; }
.lesson {
  display: flex; flex-direction: column; gap: 6px; height: 100%;
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 10px;
  padding: 18px 18px 16px; color: var(--ink); transition: transform .12s ease, box-shadow .12s ease;
}
.lesson:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(44,38,32,.08); border-color: var(--amber); }
.lesson-subject { font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--sage); font-weight: 700; }
.lesson-name { font-family: var(--serif); font-size: 20px; line-height: 1.3; }
.lesson-more { margin-top: auto; font-size: 13px; color: var(--amber-deep); }

/* article */
.article { padding: 30px 0 60px; }
.crumbs { font-size: 13px; color: var(--ink-soft); margin: 6px 0 22px; }
.crumbs span { margin: 0 8px; color: var(--rule); }
.article-head h1 { font-family: var(--serif); font-size: clamp(28px, 4.5vw, 42px); line-height: 1.15; margin: 0 0 6px; max-width: 24ch; }
.article-subject { margin: 0 0 8px; font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--sage); font-weight: 700; }
.zh { margin: 0 0 14px; color: var(--ink-soft); font-size: 16px; }
.lede { font-size: 21px; color: var(--ink-soft); max-width: 66ch; margin: 0; }

.factstrip {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 0;
  margin: 30px 0 40px; border: 1px solid var(--rule); border-radius: 12px; overflow: hidden;
  background: var(--paper-2);
}
.fact { padding: 14px 16px; border-left: 1px solid var(--rule); }
.fact:first-child { border-left: 0; }
.fact dt { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--amber-deep); font-weight: 700; margin-bottom: 4px; }
.fact dd { margin: 0; font-size: 15px; color: var(--ink); }

.prose { max-width: 72ch; }
.sec { margin-bottom: 34px; }
.sec h2 { font-family: var(--serif); font-size: 25px; margin: 0 0 12px; display: flex; align-items: baseline; gap: 12px; }
.sec-no { font-family: var(--sans); font-size: 13px; font-weight: 700; color: var(--sage); background: var(--sage-soft); border-radius: 6px; padding: 2px 8px; letter-spacing: .06em; }
.sec p { margin: 0 0 15px; }
.legal p { margin: 0 0 15px; }

.related { margin-top: 46px; border-top: 2px solid var(--rule); padding-top: 22px; }
.related h2 { font-family: var(--serif); font-size: 22px; margin: 0 0 12px; }
.related ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; max-width: 72ch; }
.related li a { display: block; padding: 12px 16px; background: var(--paper-2); border: 1px solid var(--rule); border-radius: 8px; color: var(--ink); }
.related li a:hover { text-decoration: none; border-color: var(--amber); }

.cathead { margin: 6px 0 20px; }
.cathead h1 { font-family: var(--serif); font-size: clamp(28px, 4.5vw, 40px); margin: 4px 0 10px; }

/* footer */
.sitefoot { background: var(--paper-2); border-top: 1px solid var(--rule); padding: 28px 0; color: var(--ink-soft); font-size: 15px; }
.sitefoot p { margin: 0 0 8px; }
.foot-links a { color: var(--ink-soft); }
.foot-links span { margin: 0 8px; color: var(--rule); }
.foot-fine { color: var(--sage); font-size: 14px; }

@media (max-width: 760px) {
  .lesson-grid, .lesson-grid.wide, .related ul { grid-template-columns: 1fr; }
  .factstrip { grid-template-columns: 1fr 1fr; }
  .fact { border-left: 0; border-top: 1px solid var(--rule); }
  .fact:nth-child(-n+2) { border-top: 0; }
  .mainnav { gap: 12px; font-size: 14px; }
  body { font-size: 17px; }
}