:root{
  --paper:#f7f2e7;
  --paper2:#efe6d6;
  --card: rgba(255,255,255,.62);
  --stroke: rgba(0,0,0,.10);
}

*{ box-sizing:border-box; }

body{
  margin:0;
  min-height:100vh;
  display:grid;
  place-items:center;
  background: linear-gradient(180deg, var(--paper), var(--paper2));
  overflow:hidden;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Arial,
               "PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Microsoft YaHei";
}

/* main frame */
.stage{
  width:min(1100px, 92vw);
  height:min(720px, 90vh);
  position:relative;

  /* 关键：不要卡片阴影 */
  box-shadow: none;

  /* 关键：不要硬切边 */
  border-radius: 0;
  overflow: visible;

  /* 轻微提亮中心，不是“卡片背景” */
  background: transparent;

  /* 关键：用 mask 让边缘渐隐 */
  -webkit-mask-image: radial-gradient(closest-side,
    rgba(0,0,0,1) 72%,
    rgba(0,0,0,.35) 88%,
    rgba(0,0,0,0) 100%);
  mask-image: radial-gradient(closest-side,
    rgba(0,0,0,1) 72%,
    rgba(0,0,0,.35) 88%,
    rgba(0,0,0,0) 100%);
}

/* background image */
.bgimg{
  position:absolute;
  inset:0;
  background-image: url("./ink-war.jpg");
  background-size: cover;
  background-position: center;
  filter: contrast(0.78) saturate(.35) brightness(.98);
  transform: scale(1.02);
  opacity: 70%;
  z-index:0;
}

/* animated wash overlay */
#wash{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  z-index:1;
  mix-blend-mode:multiply;
  opacity:.55;
  pointer-events:none;
}

/* paper fibers + vignette */
.paperOverlay{
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background:
    radial-gradient(1200px 900px at 20% 20%, rgba(90,70,40,.10), transparent 62%),
    radial-gradient(900px 700px at 78% 76%, rgba(30,60,90,.08), transparent 60%),
    repeating-linear-gradient(90deg, rgba(40,30,15,.020) 0 1px, transparent 1px 7px),
    repeating-linear-gradient(0deg, rgba(40,30,15,.014) 0 1px, transparent 1px 9px),
    radial-gradient(closest-side at 50% 50%, transparent 68%, rgba(0,0,0,.12) 100%);
  mix-blend-mode:multiply;
  opacity:.85;
}

/* title */
.topline{
  position:absolute;
  top:18px; left:22px; right:22px;
  display:flex;
  justify-content:space-between;
  gap:12px;
  color: rgba(255,255,255,.72);
  text-shadow: 0 2px 16px rgba(0,0,0,.35);
  letter-spacing:.12em;
  font-size:12px;
  text-transform: uppercase;
  user-select:none;
  z-index:5;
}
.topline b{ color: rgba(255,255,255,.95); font-weight:650; }

/* center svg layer */
.center{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  z-index:4;
}
svg{
  width:min(860px, 88vw);
  height:auto;
  max-height: 88vh;
}

/* highlight visibility + scale */
.region text{
  transition: opacity .18s ease, transform .18s ease;
  transform-origin: center;
  transform-box: fill-box;
}

/* turn ON the highlighted region */
body[data-active="bu"]  #bu  text,
body[data-active="kou"] #kou text,
body[data-active="ge"]  #ge  text{
  opacity: 1 !important;
  transform: scale(1.08);
}

/* wash out base character when active */
body[data-active]:not([data-active=""]) #baseChar{
  opacity: .18;
}

/* floating callout */
.callout{
  position:absolute;
  min-width: 260px;
  max-width: 420px;
  padding: 14px 14px 12px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--stroke);
  box-shadow: 0 18px 40px rgba(0,0,0,.18);
  backdrop-filter: blur(7px);
  z-index:6;
  pointer-events:none;

  opacity:0;
  transform: translateY(10px);
  transition: opacity .14s ease, transform .14s ease;
}
.callout.on{ opacity:1; transform: translateY(0); }

.callout .row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap: 10px;
  margin-bottom: 8px;
}
.callout .cn{
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  font-family: "STLiti","LiSu","KaiTi","STKaiti","FangSong","SimSun",serif;
}
.callout .meta{
  text-align:right;
  font-size: 12px;
  color: rgba(20,20,20,.62);
  letter-spacing:.06em;
  text-transform: uppercase;
  line-height:1.2;
}
.callout .desc{
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(0,0,0,.78);
}

/* mobile */
@media (max-width: 720px){
  .callout{ min-width: 220px; max-width: 86vw; }
  svg{ width:min(740px, 92vw); }
}

.megaNav{
  position: fixed;
  top: 14px;
  left: 14px;
  right: 14px;
  z-index: 9999;

  display:flex;
  align-items:center;
  gap: 12px;

  padding: 10px 12px;
  border-radius: 18px;

  background: rgba(255,255,255,.58);
  border: 1px solid rgba(255,255,255,.26);
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 44px rgba(0,0,0,.14);
}

.homeLink{
  text-decoration:none;
  font-weight: 750;
  letter-spacing:.06em;
  color: rgba(0,0,0,.82);
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.30);
  border: 1px solid rgba(0,0,0,.08);
  white-space: nowrap;
}

.cats{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items:center;
}

.cat{ position: relative; }

.catBtn{
  text-decoration:none;
  font-size: 12px;
  letter-spacing:.10em;
  text-transform: uppercase;
  color: rgba(0,0,0,.68);

  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.30);
  border: 1px solid rgba(0,0,0,.08);

  transition: background .16s ease, border-color .16s ease, transform .16s ease;
  white-space: nowrap;
}

.cat:hover .catBtn{
  background: rgba(255,255,255,.72);
  border-color: rgba(0,0,0,.16);
  transform: translateY(-1px);
}

/* dropdown (slides down) */
.drop{
  position:absolute;
  top: calc(100% + 10px);
  left: 0;

  min-width: 260px;
  padding: 10px;
  border-radius: 18px;

  background: rgba(255,255,255,.70);
  border: 1px solid rgba(0,0,0,.10);
  backdrop-filter: blur(12px);
  box-shadow: 0 26px 70px rgba(0,0,0,.18);

  display:flex;
  flex-wrap: wrap;
  gap: 10px;

  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
  transition: opacity .16s ease, transform .16s ease;
}

.cat:hover .drop{
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* dropdown links are LiShu-styled characters */
.dropLink{
  text-decoration:none;
  font-family: "STLiti","LiSu","KaiTi","STKaiti","FangSong","SimSun",serif;
  font-size: 22px;
  line-height: 1;

  color: rgba(0,0,0,.74);
  padding: 8px 12px;
  border-radius: 999px;

  background: rgba(255,255,255,.40);
  border: 1px solid rgba(0,0,0,.08);

  transition: background .14s ease, border-color .14s ease, transform .14s ease;
}

.dropLink:hover{
  background: rgba(255,255,255,.72);
  border-color: rgba(0,0,0,.16);
  transform: translateY(-1px);
}

.dropLink[aria-current="page"]{
  color: rgba(150,20,20,.92);
  border-color: rgba(150,20,20,.22);
  background: rgba(255,255,255,.80);
}

/* push your in-stage topline down so it doesn't sit under nav */
.topline{ top: 72px; }

/* mobile: stack, hide dropdowns if you want (optional) */
@media (max-width: 740px){
  .drop{ min-width: 220px; }
}