:root{
  --bg:#ffffff; --bg2:#f4f5f6; --ink:#0f1a1c; --muted:#5c6b72; --line:#e8ecee; --pill:#ffffff; --pillb:#dfe4e7;
  --accent:#b8621a; --accent-ink:#ffffff; --soft:#f7efe5; --pray:#c24f74; --link:#2a5db0; --shadow:0 2px 14px rgba(0,0,0,.10);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1113; --bg2:#181c1f; --ink:#eef1f3; --muted:#91a1a9; --line:#252b2f; --pill:#0e1113; --pillb:#323a3f;
    --accent:#e39a52; --accent-ink:#1a0f04; --soft:#231c14; --pray:#f07fa0; --link:#7fb0f0; --shadow:0 2px 14px rgba(0,0,0,.5);
  }
}
:root[data-theme="dark"]{
  --bg:#0e1113; --bg2:#181c1f; --ink:#eef1f3; --muted:#91a1a9; --line:#252b2f; --pill:#0e1113; --pillb:#323a3f;
  --accent:#e39a52; --accent-ink:#1a0f04; --soft:#231c14; --pray:#f07fa0; --link:#7fb0f0; --shadow:0 2px 14px rgba(0,0,0,.5);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--ink)}
body{font:17px/1.55 -apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,textarea{font:inherit;color:inherit}
svg.i{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;flex:none}
.wrap{max-width:680px;margin:0 auto;min-height:100vh;position:relative}
@media (min-width:700px){ .wrap{border-left:1px solid var(--line);border-right:1px solid var(--line)} }
.loading{display:flex;align-items:center;justify-content:center;min-height:70vh;opacity:.35}
.loading .mark{width:44px;height:44px}
.mark{width:28px;height:28px;fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* floating controls */
.fbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:linear-gradient(var(--bg) 60%,transparent)}
.fbtn{height:44px;min-width:44px;border-radius:99px;background:var(--pill);box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;gap:4px;padding:0 12px}
.fgroup{display:flex;align-items:center;gap:2px;background:var(--pill);box-shadow:var(--shadow);border-radius:99px;padding:0 4px;height:44px}
.fgroup button{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%}
.signin{font-weight:700;color:var(--accent);padding:0 18px}
.logo{display:flex;align-items:center;gap:6px;letter-spacing:.02em;font-weight:800;font-size:18px;color:var(--accent)}
.logo .mark{width:28px;height:28px}

/* avatars */
.av{width:24px;height:24px;border-radius:50%;flex:0 0 auto!important;aspect-ratio:1/1;min-width:0;max-width:none;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:11px;background-size:cover;background-position:center;background-color:#eadfce}
.av.md{width:36px;height:36px;font-size:14px}
.av.lg{width:44px;height:44px;font-size:17px}
.av.xl{width:72px;height:72px;font-size:28px}

/* feed card */
.card{display:block;padding:12px 16px;border-bottom:1px solid var(--line)}
.meta{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.meta b{color:var(--ink);font-weight:600}
.ttl{font-size:20px;font-weight:700;line-height:1.38;margin:6px 0}
.ttl .no{color:var(--accent);font-weight:700;margin-right:8px}
.lpart{color:var(--link);font-weight:600}
.mtags{display:flex;gap:8px;overflow-x:auto;padding:2px 16px 12px;border-bottom:1px solid var(--line);scrollbar-width:none;-webkit-overflow-scrolling:touch}
.mtags::-webkit-scrollbar{display:none}
.mtags:empty{display:none}
.mt{flex:none;display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 14px;border-radius:99px;font-size:14.5px;font-weight:600;color:var(--link);background:color-mix(in srgb,var(--link) 9%,transparent);white-space:nowrap}
.mt.course{background:var(--soft);color:var(--accent);padding-left:5px}
.mt small{color:var(--muted);font-weight:400}
.mt.all{background:transparent;border:1px solid var(--pillb);color:var(--ink)}
.rel.trow{display:flex;align-items:center;gap:12px}
.rel.trow > span:not(.av){flex:1;min-width:0}
.rel.trow b{display:block;font-size:17px;color:var(--link)}
.rel.trow small{color:var(--muted);font-size:13px}
.rel.trow svg{color:var(--muted)}
.tagcloud{display:flex;flex-wrap:wrap;gap:10px;padding:6px 16px}
.tagcloud a{font-size:16px;font-weight:600;color:var(--link);background:color-mix(in srgb,var(--link) 9%,transparent);border-radius:99px;padding:6px 14px}
.tagcloud small{color:var(--muted);font-weight:400}
.ltags .wide{display:none}
.flair{display:inline-block;font-size:12.5px;font-weight:700;border-radius:99px;padding:1px 10px;line-height:22px;margin:0 6px 6px 0}
.fl-pray{background:color-mix(in srgb,var(--pray) 14%,transparent);color:var(--pray)}
.fl-q{background:color-mix(in srgb,var(--link) 14%,transparent);color:var(--link)}
.pv{font-size:15.5px;color:var(--muted);line-height:1.55;display:-webkit-box;-webkit-line-clamp:9;-webkit-box-orient:vertical;overflow:hidden;white-space:pre-line}
.media{margin-top:8px;border-radius:16px;overflow:hidden;border:1px solid var(--line)}
.media video,.media iframe{display:block;width:100%;aspect-ratio:16/9;border:0;background:#000}
.media audio{display:block;width:100%}
.upd{margin-top:8px;font-size:15px;border-left:3px solid #3a9a68;padding-left:10px}
.upd b{color:#3a9a68}
.acts{display:flex;gap:8px;margin-top:10px;align-items:center}
.ap{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 14px;border-radius:99px;border:1px solid var(--pillb);font-size:15px;font-weight:600;background:var(--bg)}
.ap.on{border-color:transparent;background:color-mix(in srgb,var(--pray) 14%,transparent);color:var(--pray)}
.ap .e{font-size:16px}
.ap svg{width:19px;height:19px}
.ap.sh{margin-left:auto;width:40px;padding:0;justify-content:center}
.more-btn{display:block;margin:16px auto;padding:10px 22px;border-radius:99px;border:1px solid var(--pillb);font-weight:600}

/* post page */
.post{padding:4px 16px 10px}
.phead{display:flex;gap:10px;align-items:center;margin:4px 0 8px}
.phead .l1{font-size:15px;font-weight:700}
.phead .l2{font-size:14px;color:var(--muted)}
.ptitle{font-size:26px;font-weight:800;line-height:1.32;margin:6px 0 8px}
.body{font-size:18px;line-height:1.8;margin-top:6px;overflow-wrap:anywhere}
.body p{margin:0 0 16px}
.body .lead{font-weight:500}
.body h3{font-size:19px;margin:24px 0 6px}
.body blockquote{margin:16px 0;padding:12px 16px;background:var(--bg2);border-radius:14px;font-family:"Songti SC","Noto Serif SC",serif}
.body blockquote p{margin:0}
.body blockquote cite{display:block;font-style:normal;font-size:14px;color:var(--muted);margin-top:4px;font-family:-apple-system,"PingFang SC",sans-serif}
.body .pull{font-size:20px;font-weight:700;color:var(--accent);text-align:center;margin:24px 8px;line-height:1.55}
.body .box{background:var(--soft);border-radius:14px;padding:14px 16px;margin:16px 0;font-size:16px;line-height:1.7}
.body .box h4{margin:0 0 6px}
.body .box ol{margin:4px 0 0;padding-left:20px}
.body .cert{border:2px double var(--accent);border-radius:12px;padding:16px;text-align:center;line-height:2;font-size:16px}
.body .cert .t{font-weight:800;letter-spacing:.2em;color:var(--accent)}
.body .blank{display:inline-block;min-width:60px;border-bottom:1px solid var(--ink)}
.body .sign{font-size:14px;color:var(--muted)}
.q{background:var(--soft);border-radius:16px;padding:14px 16px;margin:14px 0 4px}
.q .l{font-size:13px;font-weight:700;color:var(--accent)}
.q .b{font-size:18px;font-weight:700;line-height:1.5;margin-top:2px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 2px}
.tags a{font-size:15px;font-weight:600;color:var(--link);background:color-mix(in srgb,var(--link) 9%,transparent);border-radius:99px;padding:4px 12px}
.respond{display:inline-flex;align-items:center;gap:6px;margin-top:12px;font-size:15px;color:var(--link);font-weight:600}
.nextbtn{display:flex;align-items:center;justify-content:space-between;margin:10px 16px 0;padding:14px 16px;border-radius:16px;background:var(--accent);color:var(--accent-ink);font-weight:700}
.nextbtn small{display:block;font-weight:500;opacity:.85;font-size:13px}
.sec{font-size:15px;font-weight:700;color:var(--muted);margin:22px 16px 4px}
.rel{display:block;margin:8px 16px;padding:12px 14px;border:1px solid var(--line);border-radius:16px}
.rel .meta{font-size:13px}
.rel b.t{display:block;font-size:16px;line-height:1.4;margin-top:4px}
.rel .rt{font-size:13px;color:var(--link);margin-top:4px}

/* comments */
.cmts{padding:4px 16px 120px;border-top:8px solid var(--bg2);margin-top:18px}
.csort{font-size:14px;color:var(--muted);padding:12px 0 2px}
.cm{padding-top:14px}
.cm .ch{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);cursor:pointer}
.cm .ch b{color:var(--ink);font-weight:600}
.cm .ct{font-size:16.5px;line-height:1.65;margin:4px 0 0 44px;white-space:pre-line;overflow-wrap:anywhere}
.cm .ca{display:flex;justify-content:flex-end;align-items:center;gap:18px;font-size:14px;color:var(--muted);margin-top:4px;font-weight:600}
.cm .ca button{display:inline-flex;align-items:center;gap:5px;padding:4px 2px}
.cm .ca button.on{color:var(--pray)}
.cm .ca svg{width:18px;height:18px}
.kids{margin-left:17px;padding-left:16px;border-left:2px solid var(--line)}
.cm.sp>.ct{background:var(--soft);border-radius:12px;padding:8px 12px}
.collapsed>.ct,.collapsed>.ca,.collapsed>.kids{display:none}
.collapsed>.ch::after{content:"（已收起）";font-size:12px}
.empty{color:var(--muted);font-size:15px;padding:18px 0}

/* join bar */
.join{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(14px + env(safe-area-inset-bottom));width:min(648px,calc(100% - 28px));z-index:30;height:54px;border-radius:99px;background:var(--pill);box-shadow:var(--shadow);border:1px solid var(--line);display:flex;align-items:center;gap:10px;padding:0 20px;color:var(--muted);font-size:17px}
.join svg{width:22px;height:22px;color:var(--ink)}

/* tag page */
.thead{padding:4px 16px 12px;border-bottom:1px solid var(--line)}
.thead h1{font-size:28px;margin:0;color:var(--link);overflow-wrap:anywhere}
.thead p{color:var(--muted);margin:2px 0 12px;font-size:15px}
.segc{display:inline-flex;background:var(--bg2);border-radius:99px;padding:3px}
.segc a{padding:6px 16px;border-radius:99px;font-size:14px;font-weight:600;color:var(--muted)}
.segc a.on{background:var(--bg);color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.1)}
.end{text-align:center;color:var(--muted);font-size:14px;padding:26px 0 110px}

/* sign in */
.auth{padding:12vh 24px 40px;max-width:420px;margin:0 auto}
.auth .mk{display:block}
.auth .mk .mark{width:60px;height:60px;stroke-width:1.8}
.auth h1{font-size:30px;margin:20px 0 4px;line-height:1.25}
.auth .sub{color:var(--muted);margin:0 0 26px}
.seg2{display:flex;background:var(--bg2);border-radius:12px;padding:3px;margin-bottom:14px}
.seg2 button{flex:1;padding:9px;border-radius:10px;font-weight:600;color:var(--muted)}
.seg2 button.on{background:var(--bg);color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.1)}
.field{display:block;margin:10px 0}
.field span{display:block;font-size:14px;color:var(--muted);margin-bottom:4px}
.field input{width:100%;height:48px;border-radius:12px;border:1px solid var(--pillb);background:var(--bg);padding:0 14px;font-size:17px}
.field input:focus,.field textarea:focus{outline:2px solid color-mix(in srgb,var(--accent) 45%,transparent);border-color:var(--accent)}
.primary{display:flex;align-items:center;justify-content:center;width:100%;height:52px;border-radius:14px;background:var(--accent);color:var(--accent-ink);font-size:18px;font-weight:700;margin-top:16px}
.primary[disabled]{opacity:.5}
.err{color:var(--pray);font-size:15px;min-height:22px;margin-top:8px}
.fine{font-size:13px;color:var(--muted);margin-top:16px;line-height:1.6}

/* sheet */
.mask{position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:50;display:none}
.mask.on{display:block}
.sheet{position:fixed;left:50%;transform:translateX(-50%);bottom:0;width:min(680px,100%);max-height:92vh;overflow:auto;z-index:51;background:var(--bg);border-radius:22px 22px 0 0;padding:12px 16px calc(16px + env(safe-area-inset-bottom));display:none;box-shadow:0 -6px 30px rgba(0,0,0,.2)}
.sheet.on{display:block}
.sheet .grab{width:40px;height:5px;border-radius:9px;background:var(--pillb);margin:0 auto 10px}
.sheet .st{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;gap:10px}
.sheet .st .to{font-size:14px;color:var(--muted);text-align:center;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sheet .cancel{color:var(--muted)}
.sheet .pub{background:var(--accent);color:var(--accent-ink);font-weight:700;border-radius:99px;padding:8px 22px}
.sheet .pub[disabled]{opacity:.4}
.sheet .tin{width:100%;border:0;outline:0;font-size:20px;font-weight:700;padding:8px 0;background:transparent;border-bottom:1px solid var(--line)}
.sheet textarea{width:100%;min-height:160px;border:0;outline:0;resize:vertical;font-size:18px;line-height:1.7;background:transparent;padding:8px 0}
.sheet .opt{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);padding:12px 2px;font-size:15px;color:var(--muted)}
.sheet .opt input[type=text]{flex:1;border:0;outline:0;background:transparent;font-size:15px;text-align:right;color:var(--link)}
.sheet .opt input[type=checkbox]{width:22px;height:22px;accent-color:var(--accent)}
.sheet .ref{font-size:14px;color:var(--muted);background:var(--bg2);border-radius:12px;padding:8px 12px;margin-bottom:6px}
.sheet .menu a,.sheet .menu button{display:block;width:100%;text-align:left;padding:14px 4px;border-top:1px solid var(--line);font-size:17px}
.aved{padding:4px 0 6px}
.avstage{position:relative;width:min(280px,72vw);aspect-ratio:1;margin:10px auto 14px;border-radius:50%;overflow:hidden;background:var(--bg2);touch-action:none}
.avstage canvas{width:100%;height:100%;display:block;cursor:grab}
.avstage canvas:active{cursor:grabbing}
.avring{position:absolute;inset:0;border-radius:50%;box-shadow:inset 0 0 0 3px color-mix(in srgb,var(--accent) 55%,transparent);pointer-events:none}
.avempty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:15px;pointer-events:none}
.aved input[type=range]{display:block;width:min(280px,72vw);margin:0 auto;accent-color:var(--accent)}
.avpick{cursor:pointer}
.avremove{display:block;margin:12px auto 0;color:var(--muted);font-size:14px;text-decoration:underline}
.toast{position:fixed;left:50%;top:18px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 16px;border-radius:99px;font-size:14px;z-index:60;opacity:0;transition:opacity .2s;pointer-events:none;max-width:90vw}
.toast.on{opacity:1}

/* ---------------- desktop: X-style three columns ---------------- */
.lside,.rside,.dtitle{display:none}
@media (min-width:700px){
  .shell{display:flex;justify-content:center;min-height:100vh}
  .wrap{width:600px;flex:none;margin:0;max-width:none}
  .lside{display:block;width:88px;flex:none}
  .lin{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;align-items:flex-end;padding:8px 12px}
  .lbrand{display:flex;align-items:center;gap:10px;padding:10px;font-weight:800;font-size:20px;color:var(--accent)}
  .lbrand .mark{width:34px;height:34px}
  .lbrand span,.lnav span,.lpost span,.lme .lt{display:none}
  .lnav .lcourse{display:none}
  .lnav{display:flex;flex-direction:column;gap:2px;margin-top:6px}
  .lnav a{display:flex;align-items:center;gap:16px;padding:12px;border-radius:99px;font-size:19px}
  .lnav a:hover{background:var(--bg2)}
  .lnav a.on{font-weight:800;color:var(--accent)}
  .lnav a.on svg{stroke-width:2.6}
  .lnav svg{width:26px;height:26px}
  .lpost{margin-top:16px;width:52px;height:52px;border-radius:99px;background:var(--accent);color:var(--accent-ink);font-weight:800;font-size:17px;display:flex;align-items:center;justify-content:center;gap:8px}
  .lpost:hover{filter:brightness(.95)}
  .lme{margin-top:auto;margin-bottom:12px;display:flex;align-items:center;gap:10px;padding:10px;border-radius:99px;text-align:left}
  .lme:hover{background:var(--bg2)}
  .lme b{display:block;font-size:15px;line-height:1.2}
  .lme small{color:var(--muted);font-size:13px}
  .fbar{background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding:8px 16px;min-height:56px}
  .fbar .logo,.fbar .fgroup,.fbar .signin{display:none}
  .fbar .fbtn{box-shadow:none;background:transparent}
  .fbar .fbtn:hover{background:var(--bg2)}
  .dtitle{display:block;margin:0;font-size:20px;font-weight:800}
  .join{position:sticky;left:auto;transform:none;width:auto;margin:0 16px 16px;bottom:16px}
  .cmts{padding-bottom:24px}
  .sheet{top:8vh;bottom:auto;border-radius:20px;width:600px;max-height:84vh}
  .sheet .grab{display:none}
  .auth{padding-top:6vh}
}
@media (min-width:1000px){
  .rside{display:block;width:350px;flex:none;padding-left:28px}
  .rin{position:sticky;top:0;padding:12px 0 24px}
  .rcard{display:block;background:var(--bg2);border-radius:16px;margin-bottom:16px;overflow:hidden}
  .rh{font-size:20px;font-weight:800;padding:12px 16px 4px}
  .rq{padding:4px 0 14px}
  .rq .rh{font-size:13px;color:var(--accent);padding-bottom:0}
  .rqb{font-size:17px;font-weight:700;line-height:1.5;padding:2px 16px 10px}
  .rq .meta{padding:0 16px}
  .rq .meta span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .rq:hover{filter:brightness(.98)}
  .rrow{display:flex;align-items:center;gap:12px;padding:12px 16px;transition:background .15s}
  .rrow:hover,.rmore:hover{background:color-mix(in srgb,var(--ink) 4%,transparent)}
  .rt2{flex:1;min-width:0;display:flex;flex-direction:column;line-height:1.35}
  .rt2 b{font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .rt2 small{color:var(--muted);font-size:13px}
  .rrow svg{width:18px;height:18px;color:var(--muted)}
  .trend{padding:9px 16px}
  .trend .rt2 b{margin:1px 0}
  .rmore{display:block;padding:14px 16px;color:var(--link);font-size:15px}
  .rfoot{font-size:13px;color:var(--muted);line-height:1.8;padding:0 4px}
  .mtags{display:none}
}
@media (min-width:1280px){
  .lside{width:275px}
  .lin{align-items:stretch}
  .lbrand span,.lnav span,.lpost span{display:inline}
  .lnav .lcourse{display:flex}
  .lnav .ltags .narrow{display:none}
  .lnav .ltags .wide{display:inline}
  .lme .lt{display:block;min-width:0}
  .lnav a{width:max-content;padding:12px 18px 12px 12px}
  .lpost{width:90%;height:52px}
}

/* 阿们: heart outline, filled when given */
.ap.on svg,.cm .ca button.on svg{fill:currentColor}
.cm .ca svg{width:18px;height:18px}