/* Research-first demand module embedded in the #needs section.
   Scoped under .demand-research / .demand-bubbles; reuses tokens from styles.css :root.
   Covers: the two data-source tabs, the demand-heat bar chart, the animated bubble cloud,
   and the collapsible research-method panel. */

/* ---- data-source tabs (携程数据 / 社媒数据) ---- */
.needs-tabs{display:inline-flex;gap:4px;padding:4px;background:#f1f3f7;border-radius:11px;margin-bottom:24px}
.needs-tab{border:0;background:transparent;color:var(--muted);font-size:13.5px;font-weight:650;padding:9px 20px;border-radius:8px;line-height:1.5;transition:background .25s,color .25s,box-shadow .25s}
.needs-tab:hover{color:var(--blue)}
.needs-tab[aria-selected="true"]{background:#fff;color:var(--blue);box-shadow:0 1px 5px #1b284a14}
.needs-panel{animation:needs-fade .42s cubic-bezier(.2,.7,.2,1) both}
@keyframes needs-fade{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}

/* ---- demand module shell ---- */
.demand-research{margin:2px 0 30px}
.demand-research .dr-lead{font-size:14.5px;color:var(--ink);line-height:1.85;margin:0;max-width:760px}
.demand-research .dr-barhead{font-size:13px;font-weight:700;letter-spacing:-.1px;color:var(--ink);margin-top:24px;display:flex;align-items:center;gap:9px}
.demand-research .dr-barhead::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--blue)}
.demand-research .dr-prov{font-size:11px;color:#8992a0;line-height:1.7;margin-top:14px;max-width:720px}

/* reveal on scroll */
.demand-research [data-rv]{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.demand-research [data-rv].in{opacity:1;transform:none}

/* ---- demand-heat bars ---- */
.demand-research .bars{margin-top:15px;display:grid;gap:9px}
.demand-research .bar-row{display:grid;grid-template-columns:140px 1fr 48px;gap:12px;align-items:center}
.demand-research .bar-row .bl{font-size:12.5px;color:var(--ink);text-align:right;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.demand-research .bar-track{display:block;height:20px;background:#eef1f7;border-radius:5px;overflow:hidden}
.demand-research .bar-fill{display:block;height:100%;width:0;border-radius:5px;transition:width 1.1s cubic-bezier(.2,.8,.2,1);background:linear-gradient(90deg,var(--blue),#5a82f5)}
.demand-research .bar-row .bv{font-family:Consolas,monospace;font-size:12px;color:#51607a}

/* ---- method: subtle toggle + silky height reveal ---- */
.demand-research .dr-method{margin-top:16px}
.demand-research .dr-method-toggle{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:#fff;
  border-radius:30px;padding:7px 14px;font-size:12px;color:var(--muted);transition:color .2s,border-color .2s,background .2s}
.demand-research .dr-method-toggle:hover{color:var(--blue);border-color:#b9c7f5;background:#f7f9ff}
.demand-research .dr-m-dot{width:6px;height:6px;border-radius:50%;background:var(--blue);opacity:.75}
.demand-research .dr-m-label{font-weight:600}
.demand-research .dr-m-chev{width:15px;height:15px;stroke:currentColor;stroke-width:2;fill:none;transition:transform .45s cubic-bezier(.4,0,.2,1)}
.demand-research .dr-method-toggle[aria-expanded="true"] .dr-m-chev{transform:rotate(180deg)}
.demand-research .dr-method-wrap{display:grid;grid-template-rows:0fr;transition:grid-template-rows .5s cubic-bezier(.4,0,.2,1)}
.demand-research .dr-method-wrap.open{grid-template-rows:1fr}
.demand-research .dr-method-inner{overflow:hidden;opacity:0;transform:translateY(-4px);transition:opacity .45s ease .05s,transform .45s ease .05s}
.demand-research .dr-method-wrap.open .dr-method-inner{opacity:1;transform:none}
.demand-research .dr-m-intro{font-size:12.5px;color:var(--muted);line-height:1.8;margin:15px 0 4px}
.demand-research .dr-m-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:12px}
.demand-research .dr-m-item{border:1px solid var(--line);border-radius:10px;padding:14px 15px;background:#fafcff}
.demand-research .dr-m-no{font-family:Consolas,monospace;font-size:11px;color:#9aa3b1}
.demand-research .dr-m-item h4{font-size:13.5px;font-weight:650;margin:5px 0 0;line-height:1.5}
.demand-research .dr-m-item p{font-size:12px;color:var(--muted);line-height:1.8;margin-top:6px}
.demand-research .dr-m-limit{margin-top:14px;border:1px dashed #d4b483;background:#fffdf6;border-radius:10px;padding:14px 16px}
.demand-research .dr-m-limit strong{font-size:12.5px;color:#9a6b1a}
.demand-research .dr-m-limit ul{margin:9px 0 0;padding-left:18px;color:#6b5a33;font-size:12px;line-height:1.85}

/* ---- animated demand word-cloud ---- */
.demand-bubbles{margin-top:4px;border:1px solid #e6ebf4;border-radius:14px;overflow:hidden;
  background:radial-gradient(130% 115% at 50% 0%, #eef2fb 0%, #f7f9fd 62%);box-shadow:0 12px 30px #1f39750d}
.demand-bubbles[hidden]{display:none}
.demand-bubbles .db-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;padding:15px 17px 10px;flex-wrap:wrap}
.demand-bubbles .db-title{font-size:14px;font-weight:700;letter-spacing:-.2px}
.demand-bubbles .db-sub{font-size:11.5px;color:var(--muted);line-height:1.6;margin-top:4px;max-width:540px}
.demand-bubbles .db-sub b{color:var(--ink);font-family:Consolas,monospace}
.demand-bubbles .db-ctrls{display:flex;gap:7px;flex-shrink:0}
.demand-bubbles .db-btn{font-size:11.5px;font-weight:600;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:30px;padding:6px 12px;transition:color .2s,border-color .2s,background .2s}
.demand-bubbles .db-btn:hover{color:var(--blue);border-color:#b9c7f5}
.demand-bubbles .db-btn[aria-pressed="true"]{background:var(--blue);color:#fff;border-color:var(--blue)}
.demand-bubbles .db-stage-wrap{position:relative;height:clamp(340px,46vh,460px)}
.demand-bubbles .db-stage{display:block;width:100%;height:100%;touch-action:none}
.demand-bubbles .db-tip{position:absolute;z-index:4;pointer-events:none;opacity:0;transition:opacity .12s;
  background:var(--ink);color:#fff;font-size:11.5px;line-height:1.5;padding:7px 10px;border-radius:9px;box-shadow:0 6px 18px #1f39752e;max-width:230px}
.demand-bubbles .db-tip b{font-weight:700}
.demand-bubbles .db-tip-cat{font-size:10.5px;opacity:.9}
.demand-bubbles .db-legend{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;padding:11px 14px 14px;border-top:1px solid #eef1f7;background:#fbfcfe}
.demand-bubbles .db-chip{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:600;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 10px;cursor:pointer;transition:opacity .15s,filter .15s,border-color .2s,box-shadow .2s}
.demand-bubbles .db-chip:hover{border-color:#b9c7f5}
.demand-bubbles .db-chip .db-dot{width:9px;height:9px;border-radius:50%;flex:0 0 auto}
.demand-bubbles .db-chip .db-ck{font-size:9px;color:var(--green)}
.demand-bubbles .db-chip.off{opacity:.4;filter:grayscale(.5)}
.demand-bubbles .db-chip[aria-pressed="true"]{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue) inset}
.demand-bubbles .db-reset{font-size:11px;color:var(--muted);background:none;border:0;text-decoration:underline;text-underline-offset:3px;padding:5px 6px;cursor:pointer}
.demand-bubbles .db-reset:hover{color:var(--blue)}

@media(max-width:600px){
  .needs-tabs{display:flex}
  .needs-tab{flex:1;padding:9px 10px;font-size:12.5px}
  .demand-research .dr-m-grid{grid-template-columns:1fr}
  .demand-research .bar-row{grid-template-columns:96px 1fr 42px;gap:9px}
  .demand-research .bar-row .bl{font-size:11px}
  .demand-bubbles .db-head{padding:13px 13px 8px}
  .demand-bubbles .db-stage-wrap{height:clamp(300px,52vh,400px)}
}
@media(prefers-reduced-motion:reduce){
  .demand-research [data-rv]{opacity:1;transform:none;transition:none}
  .demand-research .bar-fill{transition:none}
  .demand-research .dr-method-wrap,.demand-research .dr-m-chev,.demand-research .dr-method-inner{transition:none}
  .needs-panel{animation:none}
}