:root{
  --teal:#0F6E56; --teal-50:#E1F5EE; --teal-900:#04342C;
  --ink:#1c1c1a; --muted:#6b6b66; --line:rgba(0,0,0,.10);
  --bg:#f6f7f6; --card:#ffffff; --chip-bg:#E6F1FB; --chip-ink:#0C447C;
  --radius:14px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:15px;line-height:1.7;
  padding:52px 0 60px}
.hidden{display:none!important}
.muted{color:var(--muted);font-size:13px}

.topbar{position:fixed;top:0;left:0;right:0;height:52px;background:#fff;
  border-bottom:.5px solid var(--line);display:flex;align-items:center;
  justify-content:space-between;padding:0 16px;z-index:20}
.brand{font-weight:500;display:flex;align-items:center;gap:8px}
.logo{width:26px;height:26px;border-radius:7px;background:var(--teal-50);color:var(--teal-900);
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:500}
.top-actions{display:flex;align-items:center;gap:8px}
.new-chat{height:30px;border:.5px solid var(--line);border-radius:15px;background:#fff;color:var(--teal);
  display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:0 9px;font-size:12px;font-weight:500}
.new-chat .ti{font-size:16px}
.quota{font-size:13px;color:var(--teal);background:var(--teal-50);padding:3px 10px;border-radius:20px}

.view{max-width:560px;margin:0 auto;padding:12px 14px}
.card{background:var(--card);border:.5px solid var(--line);border-radius:var(--radius);
  padding:16px;margin-bottom:12px}
.card h3{margin:0 0 8px;font-size:16px;font-weight:500}

/* 空状态 */
.empty{text-align:center;padding:30px 8px 8px}
.empty-title{font-size:18px;font-weight:500}
.empty-sub{font-size:13px;color:var(--muted);margin:6px 0 18px}
.examples{display:flex;flex-direction:column;gap:8px}
.ex{background:#fff;border:.5px solid var(--line);border-radius:12px;padding:11px 14px;font-size:14px;text-align:left;color:var(--ink);cursor:pointer}
.history{margin-top:18px;text-align:left}
.section-title{font-size:12px;color:var(--muted);margin:0 0 8px}
.history-list{display:flex;flex-direction:column;gap:7px}
.hist{width:100%;background:transparent;border:.5px solid var(--line);border-radius:10px;padding:8px 11px;
  font-size:13px;color:var(--muted);text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 聊天 */
.chat{padding-bottom:140px;min-height:40vh}
.bubble-q{align-self:flex-end;background:var(--teal-50);color:var(--teal-900);
  padding:9px 13px;border-radius:14px;margin:14px 0 14px auto;max-width:85%;width:fit-content}
.answer{background:#fff;border:.5px solid var(--line);border-radius:var(--radius);
  padding:14px 16px;margin-bottom:16px}
.answer h2{font-size:16px;font-weight:500;color:var(--teal-900);margin:16px 0 6px}
.answer h3{font-size:14.5px;font-weight:500;color:var(--teal);margin:14px 0 5px}
.answer p{margin:6px 0}
.answer table{width:100%;border-collapse:collapse;font-size:13px;margin:8px 0}
.answer th,.answer td{border:.5px solid var(--line);padding:6px 8px;text-align:left}
.answer th{background:var(--teal-50);color:var(--teal-900);font-weight:500}
.answer ul,.answer ol{padding-left:20px;margin:6px 0}
.answer-actions{display:flex;justify-content:flex-end;gap:8px;margin:-2px 0 8px}
.icon-btn{width:32px;height:32px;border:.5px solid var(--line);border-radius:8px;background:#fff;color:var(--teal);
  display:inline-flex;align-items:center;justify-content:center;font-size:18px}
.followups{margin:-6px 0 18px;display:flex;flex-direction:column;gap:7px;animation:fade .3s both}
.followups-title{font-size:12px;color:var(--muted);padding-left:2px}
.followup{background:#fff;border:.5px solid var(--line);border-radius:12px;padding:10px 13px;
  font-size:13px;line-height:1.45;text-align:left;color:var(--ink);animation:fade .35s both}
.followup:active{background:var(--teal-50);border-color:rgba(15,110,86,.25)}
.followup.fresh{display:flex;align-items:center;justify-content:center;gap:6px;color:var(--teal);
  border-style:dashed;background:rgba(225,245,238,.34);font-weight:500}
.followup.fresh .ti{font-size:17px}
.pro-banner{background:#fff4df;border:1px solid #e7b85e;color:#4f3410;border-radius:10px;
  padding:10px 12px;margin:0 0 12px;font-size:13px;line-height:1.55;font-weight:500}
.evidence-boundary{display:flex;gap:9px;align-items:flex-start;background:rgba(225,245,238,.55);
  border:.5px solid rgba(15,110,86,.18);border-radius:10px;padding:10px 11px;margin:0 0 12px;color:var(--teal-900)}
.evidence-boundary .ti{color:var(--teal);font-size:18px;margin-top:1px;flex:0 0 auto}
.evidence-boundary b{display:block;font-size:13px;font-weight:500;line-height:1.35}
.evidence-boundary span{display:block;font-size:12.5px;color:var(--muted);line-height:1.55;margin-top:2px}

.cite{display:inline-flex;align-items:center;font-size:11px;padding:0 5px;height:17px;
  border-radius:6px;background:var(--chip-bg);color:var(--chip-ink);font-weight:500;
  margin:0 1px;vertical-align:1px;cursor:pointer}

.srcbar{margin-top:12px;padding-top:10px;border-top:.5px solid var(--line);
  font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px;justify-content:space-between;cursor:pointer}
.srcbar .ti{color:var(--teal)}
.sources{border:.5px solid var(--line);border-radius:10px;margin-top:8px;overflow:hidden}
.source-row{display:flex;gap:8px;align-items:flex-start;padding:9px 10px;border-top:.5px solid var(--line);font-size:12px;color:var(--muted)}
.source-row:first-child{border-top:none}
.source-row .ti{color:var(--teal);margin-top:2px}
.source-row a{color:var(--chip-ink);text-decoration:none;word-break:break-all}
.disclaimer{font-size:11.5px;color:var(--muted);margin-top:8px;line-height:1.5}
.retry{background:#fff;border:.5px solid var(--line);border-radius:var(--radius);padding:13px 15px;margin-bottom:16px}
.retry p{margin:0 0 10px;color:var(--muted);font-size:13px}
.retry button{background:var(--teal);color:#fff;border:none;border-radius:10px;padding:9px 14px;font-size:13px}

/* 推理等待态 */
.thinking{background:#fff;border:.5px solid var(--line);border-radius:var(--radius);padding:13px 15px;margin-bottom:16px}
.stage{display:flex;align-items:center;gap:8px;font-size:13px;padding:4px 0;color:var(--muted);animation:fade .28s both}
.stage.is-hidden,.reasons.is-hidden{display:none}
.stage.active{color:var(--ink);font-weight:500}
.stage.pending{color:#b9b9b3}
.stage .dot{width:17px;height:17px;border-radius:50%;background:var(--teal-50);color:var(--teal);
  display:flex;align-items:center;justify-content:center;font-size:11px;flex:0 0 auto}
.stage.active .dot{animation:pulse 1.1s infinite}
.stage.pending .dot{background:#eee;color:#b9b9b3}
.reasons{margin-top:8px;padding-top:8px;border-top:.5px solid var(--line)}
.reasons-h{font-size:11px;color:#9a9a94;margin-bottom:4px;display:flex;align-items:center;justify-content:space-between}
.elapsed{font-variant-numeric:tabular-nums;color:var(--muted)}
.reason{font-size:12.5px;color:var(--muted);margin:3px 0;animation:fade .4s both}
.cursor{display:inline-block;width:6px;height:13px;background:var(--muted);vertical-align:-2px;margin-left:3px;animation:blink 1s infinite}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}
.bar{height:3px;border-radius:2px;background:#eee;overflow:hidden;margin-top:8px;position:relative}
.bar i{position:absolute;left:0;width:var(--progress,6%);height:100%;background:var(--teal);border-radius:2px;transition:width 1s linear}
@keyframes pulse{0%,100%{opacity:.4}50%{opacity:1}}
@keyframes fade{from{opacity:0;transform:translateY(3px)}to{opacity:1}}
@keyframes shim{0%{transform:translateX(-100%)}100%{transform:translateX(330%)}}

/* 输入 */
.composer{position:fixed;bottom:60px;left:0;right:0;background:#fff;border-top:.5px solid var(--line);
  padding:8px 12px;display:flex;gap:8px;max-width:560px;margin:0 auto}
.composer input{flex:1;height:40px;border:.5px solid var(--line);border-radius:20px;padding:0 14px;font-size:14px;outline:none}
.composer input:focus{border-color:var(--teal)}
.composer input:disabled,.composer button:disabled{opacity:.45;cursor:not-allowed}
button{font-family:inherit;cursor:pointer}
.composer button{background:var(--teal);color:#fff;border:none;border-radius:20px;width:44px;font-size:18px;font-weight:500;
  display:flex;align-items:center;justify-content:center}
.ghost{display:block;width:100%;background:#fff;border:.5px solid var(--line);border-radius:12px;
  padding:12px;margin-bottom:10px;font-size:14px;color:var(--ink)}
.phone-bind{display:flex;gap:8px;margin:10px 0}
.phone-bind input{flex:1;border:.5px solid var(--line);border-radius:10px;padding:0 10px;font-size:14px}
.phone-bind button{background:var(--teal);color:#fff;border:none;border-radius:10px;padding:0 12px;font-size:13px;white-space:nowrap}
.invite-gate{background:#fff;border:.5px solid var(--line);border-radius:var(--radius);padding:18px 16px;margin:18px 0;animation:fade .3s both}
.invite-gate h3{margin:0 0 8px;font-size:17px;font-weight:500;color:var(--teal-900)}
.invite-gate p{margin:0 0 12px;color:var(--muted);font-size:13px;line-height:1.7}
.invite-entry{display:flex;gap:8px;margin:10px 0}
.invite-entry input{flex:1;height:42px;border:.5px solid var(--line);border-radius:12px;padding:0 12px;font-size:15px;text-transform:uppercase;outline:none}
.invite-entry input:focus{border-color:var(--teal)}
.invite-entry button{background:var(--teal);color:#fff;border:none;border-radius:12px;padding:0 18px;font-size:14px;white-space:nowrap}
.feedback-text{width:100%;min-height:108px;resize:vertical;border:.5px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px;line-height:1.6;outline:none;box-sizing:border-box}
.feedback-text:focus,.feedback-contact:focus{border-color:var(--teal)}
.feedback-contact{width:100%;height:40px;border:.5px solid var(--line);border-radius:10px;padding:0 10px;font-size:14px;margin:8px 0 10px;box-sizing:border-box}
.skeleton{height:14px;border-radius:7px;background:linear-gradient(90deg,#eee,#f8f8f8,#eee);
  background-size:200% 100%;animation:skel 1.1s infinite;margin:10px 0}
@keyframes skel{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* tabbar */
.tabbar{position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;border-top:.5px solid var(--line);
  display:flex;max-width:560px;margin:0 auto}
.tab{flex:1;background:none;border:none;font-size:12px;color:var(--muted);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px}
.tab .ti{font-size:20px}
.tab.active{color:var(--teal);font-weight:500}

@media (max-width:360px){
  .new-chat{width:30px;padding:0}
  .new-chat span{display:none}
}

/* 付费墙 */
.paywall{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:40;display:flex;align-items:flex-end}
.paywall-box{background:#fff;width:100%;max-width:560px;margin:0 auto;border-radius:18px 18px 0 0;padding:18px 16px 24px}
.pw-head{display:flex;justify-content:space-between;align-items:center;font-size:16px;font-weight:500;margin-bottom:14px}
.pw-head button{background:none;border:none;font-size:22px;color:var(--muted)}
.products{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
.prod{border:.5px solid var(--line);border-radius:12px;padding:12px;text-align:center}
.prod.beta-pay-note{grid-column:1/-1;text-align:left;background:var(--teal-50);border-color:rgba(15,110,86,.2)}
.prod.member{border:1.5px solid var(--teal)}
.prod .name{font-size:13px}
.prod .price{font-size:18px;font-weight:500;color:var(--teal);margin:4px 0}
.privacy{background:var(--teal-50);color:var(--teal-900);font-size:12px;padding:9px 11px;border-radius:10px;margin:10px 0}
input[type=file]{display:block;margin:10px 0;font-size:13px}
#submitCert{background:var(--teal);color:#fff;border:none;border-radius:10px;padding:10px 18px;font-size:14px}
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.8);color:#fff;
  padding:9px 16px;border-radius:20px;font-size:13px;z-index:60}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.48);z-index:70;display:flex;align-items:center;justify-content:center;padding:20px}
.modal-box{width:100%;max-width:420px;background:#fff;border-radius:14px;padding:18px;border:.5px solid var(--line)}
.modal-box h3{margin:0 0 8px;font-size:17px;font-weight:500}
.modal-box p{margin:0 0 14px;font-size:13px;color:var(--muted);line-height:1.7}
.modal-box button:not(.ghost){width:100%;background:var(--teal);color:#fff;border:none;border-radius:10px;padding:12px;font-size:14px;margin-bottom:8px}