:root { --ink:#1c2a2e;--muted:#6a7a80;--canvas:#e4ece9;--paper:rgba(248,252,250,.92);--line:rgba(40,72,78,.14);--jade:#3d8b7a;--jade-deep:#216f5c;--gold:#c4a35a; } * { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(at 50% 0,rgba(255,255,255,.56),transparent 42%),radial-gradient(circle at 12% 82%,rgba(61,139,122,.12),transparent 34%),linear-gradient(160deg,#d8e4e0 0%,#eaf1ee 48%,#d2ddd8 100%);
  color: var(--ink);
  overflow: hidden;
  overscroll-behavior: none;
}

#app { display: flex; height: 100vh; height: 100dvh; }

#scene { position: relative; flex: 1; min-width: 0; min-height: 0; }
#scene canvas { display: block; cursor: grab; touch-action: none; }

/* ---------- title ---------- */

#titlebar {
  position: absolute; top: 16px; left: 20px; z-index: 2;
  pointer-events: none;
}
#titlebar h1 { font-family:"Noto Serif SC","Songti SC",serif;font-size: 22px; font-weight: 600; letter-spacing: .08em; color: var(--ink); }
#titlebar p { font-size: 12px; color: var(--muted); margin-top: 4px; }
#titlebar #status { color: var(--jade-deep); font-style: italic; }

/* ---------- legend ---------- */

#legend {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  z-index: 2; max-height: 80vh; overflow-y: auto;
  background: rgba(248,252,250,.82); backdrop-filter: blur(10px);
  border: 1px solid var(--line); border-radius: 12px; padding: 8px 6px;box-shadow:0 12px 30px rgba(28,48,52,.09);
}
#legend ul { list-style: none; }
#legend li {
  display: flex; align-items: center; gap: 7px;
  font-size: 12px; padding: 4px 10px; border-radius: 6px;
  cursor: pointer; color: var(--muted); white-space: nowrap;
}
#legend li b { color: var(--ink); width: 22px; }
#legend li:hover, #legend li.active { background: rgba(61,139,122,.12); color: var(--jade-deep); }

.dot {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  flex-shrink: 0;
}

/* ---------- tooltip ---------- */

#tooltip {
  display: none; position: fixed; z-index: 10; pointer-events: none;
  max-width: 300px; padding: 8px 11px;
  background: rgba(248,252,250,.96); border: 1px solid var(--line);
  border-radius: 10px; font-size: 12.5px; line-height: 1.45; color: var(--ink);box-shadow:0 12px 28px rgba(28,48,52,.14);
}
#tooltip .dot { width: 9px; height: 9px; margin-right: 5px; }
#tooltip .codes { color: var(--muted); font-size: 11.5px; }
#tooltip .codes b { color: var(--ink); }

/* ---------- panel ---------- */

#panel {
  width: 350px; flex-shrink: 0; overflow-y: auto;
  background: var(--paper); border-left: 1px solid var(--line);box-shadow:-12px 0 30px rgba(28,48,52,.06);
}
#panel-content { padding: 22px 20px 40px; }

.m-head { display: flex; align-items: center; gap: 9px; }
.m-head .dot { width: 13px; height: 13px; }
.m-head h2 { font:600 21px/1.2 "Noto Serif SC","Songti SC",serif; color: var(--ink); }
.m-head h2 small { color: var(--muted); font-weight: 400; font-size: 13px; }

.m-sub { font-size: 12px; color: var(--muted); margin: 5px 0 14px; }

.flow-card { display:flex; align-items:center; justify-content:space-between; gap:12px; margin:14px 0 16px; padding:11px 12px; border:1px solid color-mix(in srgb, var(--flow-color) 30%, transparent); border-radius:10px; background:color-mix(in srgb, var(--flow-color) 8%, white); }
.flow-card strong { display:block; color:var(--ink); font-size:13px; margin-bottom:2px; }
.flow-card span { color:var(--muted); font-size:11.5px; }
.flow-card .flow-state { color:var(--jade-deep); font-weight:500; }
.flow-btn { flex:none; border:0; border-radius:8px; padding:7px 9px; cursor:pointer; background:var(--flow-color); color:white; font:600 12px/1.2 inherit; box-shadow:0 5px 12px color-mix(in srgb, var(--flow-color) 25%, transparent); }
.flow-btn:hover { filter:brightness(.95); }

#panel-content p { font-size: 13.5px; line-height: 1.6; margin-bottom: 12px; }
#panel-content h3 { font-size: 13px; color: var(--jade-deep); margin: 18px 0 8px; }

.m-desc { color: #536460; }

.point-card {
  border-left: 3px solid; border-radius: 4px;
  background: rgba(255,255,255,.72); padding: 13px 14px; margin: 16px 0 6px;box-shadow:0 8px 18px rgba(28,48,52,.06);
}
.point-card h3 { margin: 0 0 2px; font-size: 15px; color: var(--ink); }
.point-card .p-en { color: var(--muted); font-style: italic; font-size: 12.5px; margin-bottom: 8px; }
.point-card p { margin-bottom: 0; }
.point-card h4 { margin:13px 0 5px;color:var(--jade-deep);font-size:12px;letter-spacing:.04em; }
.point-tags { display:flex;flex-wrap:wrap;gap:6px;margin-top:12px; }
.point-tags span { border:1px solid rgba(61,139,122,.23);border-radius:999px;padding:3px 7px;color:var(--jade-deep);background:rgba(61,139,122,.08);font-size:11px; }
.learning-traits { display:flex; flex-wrap:wrap; gap:6px; margin:4px 0 11px; }
.learning-traits span { border:1px solid rgba(196,163,90,.46); border-radius:999px; padding:4px 8px; color:#7c6227; background:rgba(255,244,210,.78); font-size:11.5px; font-weight:600; }
.trait-source { margin:10px 0 0!important; color:var(--muted); font-size:10.5px!important; }
.point-learning-note { margin-top:12px!important;padding-top:10px;border-top:1px solid var(--line);color:var(--muted);font-size:11px!important;line-height:1.55!important; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 11.5px; padding: 4px 9px; border-radius: 20px;
  background: rgba(255,255,255,.76); color: #536460; border: 1px solid var(--line);
  cursor: pointer; font-family: inherit;
}
.chip:hover { background: rgba(61,139,122,.12); color: var(--jade-deep); }
.chip-active { background: rgba(61,139,122,.14); border-color: rgba(61,139,122,.58); color: var(--jade-deep); }

.hint { color: var(--muted); font-size: 12px; }
.source-note { color: var(--muted); font-size: 11px !important; line-height: 1.55; }

/* ---------- mobile ---------- */

@media (max-width: 760px) {
  #app { flex-direction: column; }

  #panel {
    width: 100%; height: 42vh; height: 42dvh; flex: none;
    border-left: none; border-top: 1px solid var(--line);
  }
  #panel-content { padding: 14px 14px 30px; }
  .flow-card { margin:12px 0 14px; }

  #titlebar { top: 10px; left: 12px; }
  #titlebar h1 { font-size: 16px; }
  #titlebar p { font-size: 10px; }

  #legend { display: none; }

  #tooltip { display: none !important; }
}

/* ---------- scrollbars ---------- */

#panel::-webkit-scrollbar, #legend::-webkit-scrollbar { width: 8px; }
#panel::-webkit-scrollbar-thumb, #legend::-webkit-scrollbar-thumb {
  background: rgba(61,139,122,.38); border-radius: 4px;
}