:root {
  --source-ink: #352719;
  --source-muted: #765f49;
  --source-gold: #a77a42;
  --source-red: #a9473b;
  --source-line: rgba(167, 122, 66, .28);
}

body.source-basis-open { overflow: hidden; }

.source-basis-overlay {
  position: fixed;
  inset: 76px 0 0;
  z-index: 80;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity .24s ease, transform .24s ease;
  color: var(--source-ink);
  background:
    linear-gradient(90deg, rgba(130, 141, 132, .13), transparent 23%, transparent 76%, rgba(119, 130, 122, .13)),
    radial-gradient(ellipse at 52% 12%, rgba(255, 255, 255, .96), rgba(247, 240, 229, .88) 48%, rgba(232, 222, 209, .94)),
    url('assets/home-rebuild/tianze-ink-landscape-v2.png') center 63% / cover;
}

.source-basis-overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(90, 62, 32, .13) .55px, transparent .7px);
  background-size: 5px 5px;
  opacity: .16;
  mix-blend-mode: multiply;
}

.source-basis-overlay.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.source-basis-shell {
  position: relative;
  height: 100%;
  display: grid;
  grid-template-rows: 70px 1fr;
}

.source-basis-header {
  display: grid;
  grid-template-columns: 250px 1fr 250px;
  align-items: center;
  padding: 0 48px;
  border-bottom: 1px solid rgba(160, 119, 70, .22);
  background: rgba(253, 249, 241, .72);
  backdrop-filter: blur(13px);
  box-shadow: 0 4px 18px rgba(88, 61, 31, .06);
}

.source-basis-back {
  justify-self: start;
  border: 0;
  background: none;
  color: #6e5032;
  font-family: "STKaiti", "KaiTi", "Songti SC", serif;
  font-size: 15px;
  letter-spacing: 2px;
  padding: 10px 0;
}

.source-basis-back span { margin-right: 8px; font-size: 19px; color: var(--source-gold); }
.source-basis-back:hover { color: var(--source-red); }

.source-basis-header-title {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 13px;
  color: #463321;
}

.source-basis-header-title > span { font-size: 22px; letter-spacing: 6px; }
.source-basis-header-title i { width: 1px; height: 20px; background: var(--source-line); }
.source-basis-header-title small { color: #8a725b; font-size: 12px; letter-spacing: 3px; }

.source-basis-mode {
  justify-self: end;
  padding: 6px 11px;
  border: 1px solid rgba(167, 122, 66, .3);
  border-radius: 999px;
  background: rgba(255, 251, 243, .62);
  color: #8a683e;
  font-size: 11px;
  letter-spacing: 1px;
}

.source-basis-layout {
  width: min(1390px, calc(100vw - 76px));
  height: 100%;
  min-height: 0;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 28px;
  padding: 30px 0 0;
}

.source-basis-nav {
  align-self: start;
  padding: 24px 18px 20px;
  border: 1px solid rgba(255, 255, 255, .85);
  outline: 1px solid rgba(170, 129, 78, .22);
  outline-offset: -5px;
  border-radius: 22px;
  background: linear-gradient(140deg, rgba(255, 255, 255, .78), rgba(247, 237, 220, .57));
  box-shadow: 0 10px 28px rgba(84, 58, 29, .1);
  backdrop-filter: blur(11px);
  overflow: hidden;
  position: relative;
}

.source-basis-nav::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: url('assets/home-rebuild/tianze-ink-landscape-v2.png') left bottom / auto 78%;
  opacity: .14;
  mix-blend-mode: multiply;
}

.source-basis-nav > p {
  margin: 0 10px 15px;
  color: #8b6c48;
  font-size: 13px;
  letter-spacing: 4px;
}

.source-basis-nav > button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 12px;
  border: 0;
  border-bottom: 1px solid rgba(170, 129, 78, .18);
  background: transparent;
  color: #5c4630;
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 16px;
  letter-spacing: 3px;
  text-align: left;
  transition: .18s ease;
}

.source-basis-nav > button b { color: #a37a45; font-size: 22px; font-weight: 400; }
.source-basis-nav > button:hover { color: #9e4238; padding-left: 16px; }
.source-basis-nav > button.active {
  color: #8f382f;
  background: linear-gradient(90deg, rgba(169, 71, 59, .09), transparent);
  box-shadow: inset 2px 0 #a9473b;
}

.source-basis-nav-note {
  margin: 22px 6px 0;
  padding: 14px;
  border-radius: 13px;
  background: rgba(171, 130, 78, .08);
  border: 1px solid rgba(171, 130, 78, .17);
}

.source-basis-nav-note span { color: #9a733f; font-size: 12px; letter-spacing: 2px; }
.source-basis-nav-note p { margin: 6px 0 0; color: #7d6954; font-size: 11px; line-height: 1.75; }

.source-basis-content {
  min-height: 0;
  overflow-y: auto;
  padding: 0 16px 46px 0;
  outline: none;
  scrollbar-width: thin;
  scrollbar-color: rgba(157, 113, 61, .38) transparent;
}

.source-basis-article {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.source-basis-lead {
  padding: 31px 46px 28px;
  text-align: center;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, .9);
  background: linear-gradient(140deg, rgba(255, 255, 255, .86), rgba(249, 240, 225, .64));
  box-shadow: 0 10px 30px rgba(86, 59, 30, .1);
  position: relative;
  overflow: hidden;
}

.source-basis-lead::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('assets/home-rebuild/tianze-ink-landscape-v2.png') center 68% / cover;
  opacity: .13;
  mix-blend-mode: multiply;
}

.source-basis-lead > * { position: relative; }
.source-basis-kicker { margin: 0 0 9px; color: #a0794b; font-size: 12px; letter-spacing: 5px; }
.source-basis-lead h1 { margin: 0; font-size: 38px; font-weight: 500; letter-spacing: 9px; }
.source-basis-subtitle { margin: 9px 0 0; color: #765f49; font-size: 15px; letter-spacing: 2px; }

.source-basis-rule { display: flex; align-items: center; justify-content: center; gap: 9px; margin: 17px auto 13px; color: #b08754; }
.source-basis-rule i { width: 76px; height: 1px; background: linear-gradient(90deg, transparent, rgba(168, 126, 76, .52)); }
.source-basis-rule i:last-child { transform: scaleX(-1); }
.source-basis-summary { max-width: 760px; margin: 0 auto; color: #5f4b37; font-size: 14px; line-height: 1.9; letter-spacing: .8px; }

.source-basis-quote-card,
.source-basis-explanation,
.source-basis-anchors,
.source-basis-documents,
.source-basis-footer {
  border: 1px solid rgba(255, 255, 255, .85);
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255, 255, 255, .78), rgba(248, 239, 225, .55));
  box-shadow: 0 8px 24px rgba(86, 59, 30, .075);
  backdrop-filter: blur(9px);
}

.source-basis-quote-card { padding: 26px 38px 24px; position: relative; }
.source-basis-section-mark { color: #9c7140; font-size: 12px; letter-spacing: 4px; }
.source-basis-quote-card blockquote { margin: 17px 0 10px; color: #3d2c1d; font-family: "STKaiti", "KaiTi", serif; font-size: 22px; line-height: 1.8; letter-spacing: 2px; }
.source-basis-quote-card cite { display: block; color: #8b755e; font-size: 12px; font-style: normal; text-align: right; letter-spacing: 1px; }

.source-basis-explanation,
.source-basis-anchors,
.source-basis-documents { padding: 25px 30px; }

.source-basis-section-title { display: flex; align-items: center; gap: 13px; margin-bottom: 16px; }
.source-basis-section-title > span {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(168, 124, 71, .45);
  border-radius: 50%;
  color: #9b713e;
  background: radial-gradient(circle at 38% 28%, #fffdf8, rgba(229, 209, 178, .46));
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 19px;
}
.source-basis-section-title small { display: block; color: #9a7952; font-size: 10px; letter-spacing: 3px; }
.source-basis-section-title h2 { margin: 3px 0 0; font-size: 19px; font-weight: 500; letter-spacing: 2px; }
.source-basis-explanation > p { margin: 0 0 0 55px; color: #5f4b37; font-size: 14px; line-height: 1.95; letter-spacing: .7px; }

.source-basis-anchor-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 11px; }
.source-basis-anchor-grid.is-five { grid-template-columns: repeat(5, 1fr); }
.source-basis-anchor-grid article {
  min-height: 118px;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 14px 10px;
  border: 1px solid rgba(174, 132, 80, .28);
  border-radius: 15px;
  background: rgba(255, 251, 244, .5);
  text-align: center;
}
.source-basis-anchor-grid small { color: #9b7951; font-size: 11px; letter-spacing: 2px; }
.source-basis-anchor-grid strong { margin: 7px 0 5px; color: #483421; font-family: "STKaiti", "KaiTi", serif; font-size: 21px; font-weight: 500; letter-spacing: 2px; }
.source-basis-anchor-grid p { margin: 0; color: #806c57; font-size: 10px; line-height: 1.5; }

.source-basis-document-list { display: grid; gap: 9px; }
.source-basis-document-list > div {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 13px;
  background: rgba(255, 252, 247, .46);
  border: 1px solid rgba(173, 130, 77, .2);
}
.source-basis-document-list i { color: #b08a5b; font-family: Georgia, serif; font-size: 12px; font-style: normal; }
.source-basis-document-list b { display: block; color: #4d3825; font-size: 15px; font-weight: 500; letter-spacing: 2px; }
.source-basis-document-list small { display: block; margin-top: 3px; color: #816c55; font-size: 11px; }
.source-basis-document-list em { padding: 5px 8px; border-radius: 999px; background: rgba(167, 122, 66, .09); color: #927045; font-size: 10px; font-style: normal; }

.source-basis-footer { display: flex; gap: 13px; padding: 18px 23px; }
.source-basis-footer span { flex: 0 0 auto; color: #a9473b; font-size: 12px; letter-spacing: 3px; }
.source-basis-footer p { margin: 0; color: #7b6752; font-size: 11px; line-height: 1.75; }

.source-basis-loading { min-height: 420px; display: grid; place-items: center; align-content: center; gap: 14px; color: #876c4c; letter-spacing: 3px; }
.source-basis-loading i { width: 38px; height: 38px; border-radius: 50%; border: 1px solid rgba(166, 122, 68, .26); border-top-color: #9f713d; animation: sourceBasisSpin .8s linear infinite; }
@keyframes sourceBasisSpin { to { transform: rotate(360deg); } }

@media (max-width: 1180px) {
  .source-basis-header { grid-template-columns: 210px 1fr 210px; padding: 0 30px; }
  .source-basis-layout { width: calc(100vw - 44px); grid-template-columns: 220px minmax(0, 1fr); gap: 20px; }
  .source-basis-anchor-grid.is-five { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .source-basis-overlay { inset: 76px 0 0; }
  .source-basis-header { grid-template-columns: 1fr auto; padding: 0 18px; }
  .source-basis-header-title { display: none; }
  .source-basis-mode { max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .source-basis-layout { width: 100%; grid-template-columns: 1fr; padding: 0; gap: 0; }
  .source-basis-nav { display: flex; gap: 4px; overflow-x: auto; border: 0; outline: 0; border-radius: 0; padding: 9px 12px; box-shadow: 0 4px 15px rgba(80, 54, 27, .08); }
  .source-basis-nav > p, .source-basis-nav-note { display: none; }
  .source-basis-nav > button { width: auto; flex: 0 0 auto; border: 0; border-radius: 999px; padding: 8px 12px; font-size: 13px; letter-spacing: 1px; }
  .source-basis-nav > button b { display: none; }
  .source-basis-content { padding: 15px 12px 36px; }
  .source-basis-lead { padding: 25px 20px; }
  .source-basis-lead h1 { font-size: 31px; }
  .source-basis-quote-card, .source-basis-explanation, .source-basis-anchors, .source-basis-documents { padding: 21px 18px; }
  .source-basis-quote-card blockquote { font-size: 18px; }
  .source-basis-explanation > p { margin-left: 0; }
  .source-basis-anchor-grid, .source-basis-anchor-grid.is-five { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .source-basis-overlay, .source-basis-loading i { transition: none; animation: none; }
}