:root{
  --bg:#f5f6f8; --panel:#fff; --panel2:#fafbfc; --text:#1a1d23; --muted:#6b7280;
  --line:#e5e7eb; --brand:#2563eb; --brand-soft:#eef2ff; --ok:#16a34a; --warn:#d97706;
  --bad:#dc2626; --shadow:0 1px 2px rgba(16,24,40,.06),0 4px 12px rgba(16,24,40,.05);
  --radius:14px;
}
html[data-theme="dark"]{
  --bg:#0f1115; --panel:#171a21; --panel2:#1d2129; --text:#e8eaed; --muted:#9aa1ad;
  --line:#272b34; --brand:#4f8cff; --brand-soft:#1b2436; --shadow:0 1px 2px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);overflow-x:hidden}
body{font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%}
button,input,textarea,select{font:inherit;color:inherit}
a{color:var(--brand)}
.row{display:flex;gap:10px;align-items:center}
.col{display:flex;flex-direction:column;gap:10px}
.wrap{flex-wrap:wrap}
.spread{justify-content:space-between}
.grow{flex:1;min-width:0}
.muted{color:var(--muted)}
.small{font-size:13px}
.tiny{font-size:12px}
.center{text-align:center}
.mt{margin-top:12px}
.mb{margin-bottom:12px}
.hide-sm{display:none}
.nowrap{white-space:nowrap}

/* 布局 */
.shell{display:flex;min-height:100vh}
.side{display:none}
.main{flex:1;min-width:0;padding:16px 14px 92px}
.topbar{position:sticky;top:0;z-index:20;background:var(--bg);padding:10px 14px 8px;margin:-16px -14px 8px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.topbar h1{font-size:17px;margin:0;font-weight:600}
.bottomnav{position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--panel);
  border-top:1px solid var(--line);display:flex;padding:4px 2px calc(4px + env(safe-area-inset-bottom))}
.bottomnav button{flex:1;background:none;border:0;padding:6px 2px;display:flex;flex-direction:column;align-items:center;gap:2px;
  color:var(--muted);font-size:11px;cursor:pointer}
.bottomnav button.on{color:var(--brand);font-weight:600}
.icon{font-size:19px;line-height:1}
@media(min-width:900px){
  .hide-sm{display:block}
  .side{display:flex;flex-direction:column;width:216px;flex:0 0 216px;background:var(--panel);border-right:1px solid var(--line);
    position:sticky;top:0;height:100vh;padding:14px 10px;gap:2px;overflow:auto}
  .side .brand{font-weight:700;font-size:16px;padding:6px 10px 14px}
  .side button{display:flex;gap:10px;align-items:center;background:none;border:0;padding:10px;border-radius:10px;
    color:var(--text);cursor:pointer;text-align:left;font-size:14px}
  .side button.on{background:var(--brand-soft);color:var(--brand);font-weight:600}
  .side .foot{margin-top:auto;border-top:1px solid var(--line);padding-top:10px}
  .main{padding:22px 26px 40px;max-width:1080px}
  .topbar{margin:-22px -26px 14px;padding:14px 26px 10px}
  .bottomnav{display:none}
}

/* 卡片与控件 */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.card+.card{margin-top:12px}
.grid{display:grid;gap:12px}
.g2{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
@media(max-width:560px){
  .g2,.g3{grid-template-columns:1fr}
  .task-card h3{font-size:14px}
  .card{padding:12px}
}
.task-card{cursor:pointer;border:1px solid var(--line);border-radius:var(--radius);padding:13px;background:var(--panel);
  box-shadow:var(--shadow);transition:transform .08s}
.task-card:active{transform:scale(.99)}
.task-card.done{border-color:var(--ok);background:linear-gradient(0deg,rgba(22,163,74,.06),rgba(22,163,74,.06))}
.task-card h3{margin:0 0 4px;font-size:15px}
.btn{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:9px 13px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;justify-content:center;min-height:38px}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn.ghost{background:transparent}
.btn.danger{color:var(--bad);border-color:rgba(220,38,38,.35)}
.btn.ok{background:var(--ok);color:#fff;border-color:var(--ok)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.sm{padding:6px 10px;min-height:32px;font-size:13px}
.btn.block{width:100%}
.tag{display:inline-flex;align-items:center;gap:4px;background:var(--brand-soft);color:var(--brand);
  border-radius:999px;padding:2px 9px;font-size:12px;white-space:nowrap}
.tag.gray{background:var(--panel2);color:var(--muted);border:1px solid var(--line)}
.tag.green{background:rgba(22,163,74,.12);color:var(--ok)}
.tag.red{background:rgba(220,38,38,.1);color:var(--bad)}
.tag.amber{background:rgba(217,119,6,.12);color:var(--warn)}
input[type=text],input[type=password],input[type=number],textarea,select{
  width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:10px;outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--brand)}
textarea{resize:vertical;line-height:1.6}
label.field{display:block;margin-bottom:10px}
label.field span{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg button{flex:1;min-width:78px;border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:9px 6px;cursor:pointer}
.seg button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.ring{width:74px;height:74px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:16px}
.bar{height:8px;background:var(--panel2);border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--brand)}
.list{display:flex;flex-direction:column;gap:8px}
.item{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:11px;background:var(--panel)}
.empty{text-align:center;color:var(--muted);padding:26px 14px;border:1px dashed var(--line);border-radius:12px}
.divider{height:1px;background:var(--line);margin:12px 0}
pre.code{background:#0f172a;color:#e6edf7;border-radius:10px;padding:11px;overflow:auto;white-space:pre-wrap;word-break:break-word;font-size:13px}
html[data-theme="dark"] pre.code{background:#0b0e14}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px}
.chips button{white-space:nowrap;border:1px solid var(--line);background:var(--panel);border-radius:999px;padding:6px 12px;cursor:pointer}
.chips button.on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* 提示与弹窗 */
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:86px;z-index:60;background:#111827;color:#fff;
  border-radius:10px;padding:10px 14px;font-size:14px;max-width:88vw;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.toast.err{background:var(--bad)}
.toast.ok{background:#15803d}
.toast.warn{background:var(--warn)}
@media(min-width:900px){.toast{bottom:28px;left:auto;right:26px;transform:none}}
.mask{position:fixed;inset:0;background:rgba(15,17,21,.5);z-index:70;display:grid;place-items:center;padding:18px}
.modal{background:var(--panel);border-radius:16px;padding:18px;width:100%;max-width:420px;max-height:86vh;overflow:auto}
.sheet{position:fixed;inset:auto 0 0 0;z-index:70;background:var(--panel);border-radius:18px 18px 0 0;padding:16px;
  padding-bottom:calc(16px + env(safe-area-inset-bottom))}
.savepill{position:fixed;z-index:50;right:14px;top:12px;font-size:12px;padding:5px 10px;border-radius:999px;
  background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow)}
@media(max-width:899px){.savepill{top:auto;bottom:76px;right:12px}}
.login{min-height:100vh;display:grid;place-items:center;padding:20px}
.login .card{width:100%;max-width:360px}
.bubble{border-radius:14px;padding:11px 13px;max-width:100%;word-break:break-word}
.bubble.me{background:var(--brand);color:#fff;border-bottom-right-radius:4px;margin-left:auto}
.bubble.ai{background:var(--panel);border:1px solid var(--line);border-bottom-left-radius:4px}
.chatwrap{display:flex;flex-direction:column;gap:10px}
.composer{position:sticky;bottom:0;background:var(--bg);padding:8px 0 calc(6px)}
.dot{width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block;animation:blink 1s infinite}
.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,100%{opacity:.25}50%{opacity:1}}
.sess{border:1px solid var(--line);border-radius:10px;padding:9px;cursor:pointer;background:var(--panel)}
.sess.on{border-color:var(--brand);background:var(--brand-soft)}
.spin{width:15px;height:15px;border:2px solid var(--line);border-top-color:var(--brand);border-radius:50%;
  display:inline-block;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}