:root{
  --ink:#1a1a1a; --ink2:#444444; --mut:#939393; --line:#eeeeee;
  --bg:#f2f3f5; --card:#ffffff; --accent:#eb7350; --nav:#ffffff;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.serif{font-family:"Songti SC",Georgia,serif}

/* 顶栏（微博式） */
.top{position:sticky;top:0;z-index:30;background:#16181d;border-bottom:1px solid #24272e}
.top-in{max-width:1180px;margin:0 auto;padding:0 18px;height:56px;display:flex;align-items:center;gap:18px}
.logo{font-family:"Songti SC",Georgia,serif;font-size:22px;color:#fff;line-height:1;white-space:nowrap}
.logo em{font-style:normal;color:var(--accent)}
.search{display:flex;align-items:center;gap:7px;background:#2a2d34;border:1px solid #33373f;border-radius:16px;padding:6px 12px;width:230px;color:#9aa0aa}
.search:focus-within{border-color:#4a4f59;background:#30343c}
.search input{background:none;border:0;outline:none;color:#e8eaee;font-size:13px;width:100%}
.search input::placeholder{color:#8b919b}
.top-nav{display:flex;gap:18px;font-size:13.5px;margin-left:2px}
.top-nav a{color:#b9bec7;padding:6px 0;height:56px;display:flex;align-items:center;border-bottom:2px solid transparent}
.top-nav a.on{color:#fff;border-bottom-color:var(--accent)}
.top-nav a:hover{color:#fff}
.lang{margin-left:auto;font-size:12.5px;color:#9aa0aa;white-space:nowrap;display:flex;align-items:center;gap:10px}
.lang a{color:#b9bec7}
.mbadge{display:inline-block;background:var(--accent);color:#fff;border-radius:9px;font-size:10px;padding:0 5px;margin-left:3px;line-height:15px;vertical-align:1px}
.lang a:hover{color:#fff}
.lang a.on{color:#fff}
.lang a.reg{background:var(--accent);color:#fff;padding:5px 12px;border-radius:14px}
.lang .uname{color:#e8eaee}
.lang .sep{color:#3a3e46}


/* 背景知识图上的低频闪点 */
.hero-sparks{position:absolute;inset:0;z-index:1;pointer-events:none;overflow:hidden}
.hero-sparks i{position:absolute;width:6px;height:6px;margin:-3px 0 0 -3px;border-radius:50%;
  background:radial-gradient(circle, rgba(255,215,160,.95) 0%, rgba(235,115,80,.55) 45%, rgba(235,115,80,0) 72%);
  box-shadow:0 0 10px rgba(235,150,90,.55);opacity:0;animation-name:glow;animation-iteration-count:infinite;animation-timing-function:ease-in-out}
@keyframes glow{
  0%,72%,100%{opacity:0;transform:scale(.6)}
  80%{opacity:.95;transform:scale(1.25)}
  88%{opacity:.35;transform:scale(.95)}
}
@media(max-width:600px){.hero-sparks i{width:5px;height:5px;box-shadow:0 0 7px rgba(235,150,90,.5)}}
@media(prefers-reduced-motion:reduce){.hero-sparks i{animation:none;opacity:.35}}

/* hero 背景带 */
.hero{height:320px;background:url(hero.jpg) center right/cover no-repeat;position:relative}
.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,10,14,.92) 0%,rgba(8,10,14,.62) 40%,rgba(8,10,14,.08) 72%,rgba(8,10,14,0) 100%)}
.hero-in{position:relative;z-index:2;max-width:1180px;margin:0 auto;height:100%;padding:0 18px;display:flex;flex-direction:column;justify-content:flex-end;padding-bottom:26px}
.hero h1{font-family:"Songti SC",Georgia,serif;color:#fff;font-size:30px;line-height:1.5;font-weight:400;margin:0 0 8px;max-width:720px;word-break:keep-all;text-shadow:0 1px 12px rgba(0,0,0,.35)}
.hero p{margin:0;color:rgba(255,255,255,.72);font-size:12px;letter-spacing:.08em}

/* 三栏 */
.shell{max-width:1180px;margin:0 auto;padding:16px 18px 50px;display:grid;grid-template-columns:196px minmax(0,1fr) 268px;gap:16px;align-items:start}

/* 左栏 */
.rail-left{position:sticky;top:72px}
.rail-left .card{background:var(--card);border-radius:8px 8px 0 0;padding:18px 16px 6px}
.rail-left .name{font-size:15px;font-weight:600;margin-bottom:2px}
.rail-left .desc{font-size:12px;color:var(--mut);line-height:1.7;margin-bottom:12px}
.rail-left ul{list-style:none;margin:0;padding:0}
.rail-left li a{display:flex;align-items:center;justify-content:space-between;font-size:13.5px;color:#333;padding:9px 0}
.rail-left li a:hover{color:var(--accent)}
.rail-left li a.on{color:var(--accent);font-weight:600}
.rail-left .num{font-size:11.5px;color:var(--mut)}

/* 中栏 */
.feed{min-width:0}
.composer-card{background:var(--card);border-radius:8px;padding:14px 16px;margin-bottom:10px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.composer-card span{color:var(--mut);font-size:13.5px}
.composer-card a{background:var(--accent);color:#fff;border-radius:6px;padding:7px 16px;font-size:13.5px}

.post{background:var(--card);border-radius:8px;padding:16px 18px 12px;margin-bottom:10px;transition:.15s}
.post:hover{background:#fffefd;box-shadow:0 1px 6px rgba(0,0,0,.04)}
.ph{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--mut);margin-bottom:8px}
.pill{background:#f5f6f8;color:#5a6470;border-radius:3px;padding:1px 7px;font-size:11px}
.post h2{font-size:16px;line-height:1.65;font-weight:600;margin:0 0 6px}
.post h2 a:hover{color:var(--accent)}
.post .body-t.ex{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.post .body-t{font-size:15px;line-height:1.8;color:#222;word-break:break-word}
.post .body-t p{margin:0 0 6px}
.post .body-t p:last-child{margin-bottom:0}
.post .foot{margin-top:12px;padding-top:10px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;font-size:13px;color:#5a6470}
.fbtn{color:#5a6470;background:none;border:0;font:inherit;padding:4px 2px;cursor:pointer;text-decoration:none;min-height:32px;display:inline-flex;align-items:center}
.fbtn:hover{color:var(--accent)}
@media(max-width:600px){.post .foot{font-size:13.5px}.fbtn{min-height:36px;padding:6px 2px}}
.post .foot a{color:#5a6470}
.post .foot a:hover{color:var(--accent)}

.imgs{display:grid;gap:6px;margin:10px 0 0}
.imgs.n1{grid-template-columns:1fr}
.imgs.n2{grid-template-columns:1fr 1fr}
.imgs.n3{grid-template-columns:repeat(3,1fr)}
.imgwrap{position:relative;display:block}
.imgwrap:after{content:attr(data-wm);position:absolute;right:8px;bottom:8px;font-size:10px;color:rgba(255,255,255,.55);text-shadow:0 1px 3px rgba(0,0,0,.5);pointer-events:none;letter-spacing:.04em}
.imgs img{width:100%;height:100%;object-fit:cover;display:block;border-radius:4px;background:#f0f1f3;max-height:340px}
.imgs.n3 img{max-height:150px}
.imgs.n1 img{object-fit:contain;max-height:400px}
.files{margin-top:10px;background:#f7f8fa;border-radius:6px;padding:2px 12px}
.files a{display:flex;align-items:center;gap:8px;font-size:12.5px;color:#3f4650;padding:8px 0;border-bottom:1px solid #eef0f3}
.files a:last-child{border-bottom:0}
.files a:hover{color:var(--accent)}
.files .sz{margin-left:auto;color:var(--mut);font-size:11px}

.more{display:block;text-align:center;background:var(--card);border-radius:8px;color:#5a6470;font-size:13px;padding:12px}
.more:hover{color:var(--accent)}
.empty{background:var(--card);border-radius:8px;color:var(--mut);font-size:13.5px;padding:40px;text-align:center}

/* 右栏 */
.rail-right{position:sticky;top:72px}
.rail-right .card{background:var(--card);border-radius:8px;padding:14px 16px;margin-bottom:10px}
.rail-right h3{font-size:13px;font-weight:600;margin:0 0 10px;color:#222;display:flex;justify-content:space-between}
.rail-right ul{list-style:none;margin:0;padding:0}
.rail-right li{display:flex;justify-content:space-between;font-size:13px;color:#333;padding:7px 0}
.rail-right li a{color:#333}
.rail-right li a:hover{color:var(--accent)}
.rail-right .num{color:var(--mut);font-size:11.5px}
.rail-right p{font-size:12.5px;color:#666;line-height:1.85;margin:0}
.rail-right .st{font-size:11.5px;color:var(--mut);margin-top:10px}

/* 登录弹层 */
.modal[hidden]{display:none}
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:18px}
.modal-mask{position:absolute;inset:0;background:rgba(12,14,18,.55);backdrop-filter:blur(2px)}
.modal-box{position:relative;background:#fff;border-radius:14px;width:100%;max-width:340px;padding:24px 22px 18px;box-shadow:0 12px 40px rgba(0,0,0,.2)}
.modal-box h3{margin:0 0 4px;font-size:17px}
.modal-box .sub{margin:0 0 14px;font-size:12.5px;color:#8a919b}
.mtabs{display:flex;gap:18px;margin-bottom:14px;border-bottom:1px solid #eef0f3}
.mtabs a{font-size:14px;color:#8a919b;padding:0 0 9px;border-bottom:2px solid transparent;cursor:pointer}
.mtabs a.on{color:#16181d;border-bottom-color:var(--accent);font-weight:600}
.caprow{display:flex;align-items:center;gap:8px;margin-bottom:9px}
.caprow span{font-size:14px;color:#444;min-width:64px}
.caprow input{margin:0;flex:1}
.modal-x{position:absolute;right:10px;top:8px;background:none;border:0;font-size:22px;color:#aab1ba;cursor:pointer;line-height:1}
.modal-box input{width:100%;border:1px solid #e2e5ea;border-radius:8px;padding:11px 12px;font-size:15px;margin-bottom:9px;background:#fbfcfd}
.modal-box input:focus{outline:none;border-color:var(--accent);background:#fff}
.modal-box button[type=submit]{width:100%;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:11px;font-size:15px;font-weight:600;cursor:pointer}
.malt{margin-top:12px;text-align:center;font-size:12.5px;color:#8a919b}
.malt a{color:var(--accent)}
.merr{background:#fdecec;color:#b42318;border-radius:8px;padding:8px 11px;font-size:12.5px;margin-bottom:10px}

/* 评论 */
.combox{margin-top:22px;background:#fff;border-radius:8px;padding:18px}
.combox h3{font-size:14px;margin:0 0 12px;color:#333}
.citem{display:flex;gap:10px;padding:11px 0;border-top:1px solid #f2f3f5}
.cav{width:32px;height:32px;border-radius:50%;background:#e3e7ec;color:#4a5561;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex:0 0 auto}
.cmain{flex:1;min-width:0}
.chd{display:flex;align-items:center;gap:8px;font-size:13px;color:#333;flex-wrap:wrap}
.chd a{font-weight:600}
.ctag{font-size:11px;color:#7a8492;background:#f4f5f7;border-radius:10px;padding:1px 8px}
.cd{font-size:11.5px;color:#a8b0ba}
.cdel{background:none;border:0;color:#c0392b;font-size:11.5px;cursor:pointer;padding:0}
.cbody{font-size:14px;color:#333;line-height:1.85;margin-top:3px;word-break:break-word}
.cnone{font-size:13px;color:#98a1ac;padding:10px 0}
.cform{margin-top:14px;padding-top:14px;border-top:1px solid #f2f3f5}
.crow{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.crow input{flex:1;min-width:130px;border:1px solid #e2e5ea;border-radius:6px;padding:8px 10px;font-size:13px;background:#fbfcfd}
.cform textarea{width:100%;border:1px solid #e2e5ea;border-radius:6px;padding:10px;font:inherit;font-size:14px;background:#fbfcfd;resize:vertical}
.cform button{margin-top:8px;background:var(--accent);color:#fff;border:0;border-radius:6px;padding:8px 18px;font-size:13.5px;font-weight:600;cursor:pointer}
.cerr{background:#fdecec;color:#b42318;border-radius:6px;padding:8px 11px;font-size:12.5px;margin-bottom:10px}

/* 分享 */
.share{display:flex;align-items:center;gap:8px;margin-top:14px}
.sbtn{border:0;border-radius:14px;background:var(--accent);color:#fff;font-size:12.5px;padding:6px 14px;cursor:pointer;font-family:inherit}
.sbtn.ghost{background:#f2f3f5;color:#4a5561}
.sbtn:hover{opacity:.9}
.stoast{font-size:12px;color:#12662f;opacity:0;transition:.2s}
.stoast.on{opacity:1}

/* 话题卡片（简化） */
.topiclist{display:flex;flex-direction:column;gap:0}
.topiclist .tag{display:flex;justify-content:space-between;font-size:12.5px;color:#5a6470;padding:7px 0;margin:0;background:none;border-bottom:1px solid #f0f2f5;border-radius:0}
.topiclist .tag:last-child{border-bottom:0}
.topiclist .tag:hover{color:var(--accent)}
.topiclist .tag i{font-style:normal;color:#b3bac3;font-size:11.5px}

/* 详情 */
.detail{max-width:680px;margin:0 auto;padding:16px 18px 40px}
.back{display:inline-block;font-size:12.5px;color:var(--mut);margin:6px 0 10px}
.back:hover{color:var(--accent)}
.detail .post{padding:22px 22px 16px}
.detail h1{font-size:21px;line-height:1.6;font-weight:600;margin:0 0 10px}
.detail .body-t{font-size:16px;line-height:1.9}
.detail .body-t p{margin:0 0 12px}
.alt-lang{margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}
.alt-lang .lab{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--mut);margin-bottom:8px}
.alt-lang .body-t{font-size:14.5px;color:#555}


/* 发帖框 */
.composer{background:var(--card);border-radius:8px;padding:14px 16px;margin-bottom:10px}
.c-head{display:flex;align-items:baseline;gap:8px;font-size:13px;margin-bottom:8px}
.c-head b{font-size:13.5px}
.c-head span{color:var(--mut);font-size:12px}
.composer textarea{width:100%;border:1px solid #e6e8ec;border-radius:6px;background:#fbfcfd;padding:10px 12px;font:inherit;font-size:14.5px;line-height:1.75;resize:vertical;margin-bottom:8px}
.composer textarea.en{font-size:13.5px;color:#555}
.composer textarea:focus{outline:none;border-color:var(--accent);background:#fff}
.c-foot{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.c-foot select{border:1px solid #e6e8ec;border-radius:6px;padding:6px 8px;font-size:13px;background:#fbfcfd}
.c-file{font-size:12.5px;color:#5a6470;background:#f4f5f7;border-radius:6px;padding:6px 10px;cursor:pointer}
.c-file:hover{background:#eceef1}
.c-foot button{margin-left:auto;background:var(--accent);color:#fff;border:0;border-radius:6px;padding:7px 20px;font-size:13.5px;font-weight:600;cursor:pointer}
.av{width:22px;height:22px;border-radius:50%;background:#dfe3e8;color:#5a6470;display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:600}
.an{font-size:12.5px;color:#333;font-weight:600}
button.like{background:none;border:0;color:#9aa1ab;font-size:12px;cursor:pointer;padding:0;font-family:inherit}
button.like.on{color:#e0453a}
a.like{color:#9aa1ab}
a.like:hover,button.like:hover{color:#e0453a}
a.av{text-decoration:none}
button.lnk{background:none;border:0;color:#b02a20;font-size:12px;cursor:pointer;padding:0}


/* 标签 */
.c-tags{display:flex;flex-wrap:wrap;gap:6px;margin:2px 0 10px}
.tagbox{display:inline-flex;align-items:center;cursor:pointer}
.tagbox input{display:none}
.tagbox span{font-size:12px;color:#6b7480;background:#f4f5f7;border:1px solid transparent;border-radius:12px;padding:3px 10px}
.tagbox input:checked + span{background:#fdeee9;border-color:#f3c4b8;color:#b4472a}
.tag{font-size:12px;color:#7a8492;margin-right:8px}
.tag:hover{color:var(--accent)}
.tag.on{color:var(--accent);font-weight:600}
.topiclist{display:flex;flex-wrap:wrap;gap:8px}
.topiclist .tag{background:#f5f6f8;border-radius:12px;padding:3px 10px;margin:0}
.topiclist .tag i{font-style:normal;color:#a8b0ba;font-size:11px;margin-left:2px}
.foot .tags{display:flex;flex-wrap:wrap;align-items:center;gap:2px}
.foot .sen{color:#b7bdc6;font-size:11.5px;margin-left:4px}


.sitefoot{border-top:1px solid var(--line);margin-top:40px;background:#fff}
.foot-in{max-width:1180px;margin:0 auto;padding:26px 30px 30px}
.foot-cols{display:grid;grid-template-columns:minmax(190px,1.2fr) repeat(4,minmax(0,1fr));gap:32px 48px;align-items:start}
.fbrand .fb-logo{font-size:17px;font-weight:700;color:#20242b;letter-spacing:.01em}
.fbrand .fb-sub{margin-top:8px;font-size:12px;line-height:1.9;color:#9aa1ab}
.fc h4{font-size:12.5px;color:#3c434d;font-weight:600;margin:0 0 10px;letter-spacing:.02em;white-space:nowrap}
.fc a{display:block;font-size:12.5px;color:#6b7480;padding:4px 0}
.fc a:hover{color:var(--accent)}
.foot-bottom{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:20px;padding-top:14px;border-top:1px solid #f0f2f5;color:#9aa1ab;font-size:11.5px}
@media(max-width:980px){.foot-cols{grid-template-columns:1.4fr repeat(2,1fr);gap:24px}}
@media(max-width:700px){.foot-cols{grid-template-columns:repeat(2,1fr);gap:18px 16px}.fbrand{grid-column:1/-1}.foot-in{padding:20px 16px 26px}}

footer{max-width:1180px;margin:0 auto;padding:18px;color:#9aa0aa;font-size:11.5px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}

@media(max-width:1000px){
  .shell{grid-template-columns:1fr;padding:12px 14px 34px;gap:10px}
  .rail-left,.rail-right{position:static}
  .rail-left .card{border-radius:8px;padding:14px 16px}
  .rail-left li{display:inline-block;margin-right:16px}
  .rail-left li a{display:inline-flex;gap:6px;padding:4px 0}
  .rail-left ul{display:flex;flex-wrap:wrap}
  .rail-right{order:3}
  .top-in{height:auto;padding:10px 14px;flex-wrap:wrap;gap:8px}
  .search{order:3;width:100%;margin:0}
  .top-nav{order:4;width:100%;gap:16px;overflow-x:auto;font-size:13px}
  .top-nav a{height:34px}
  .lang{margin-left:auto;gap:8px}
  .hero{height:170px;background-position:72% center}
  .hero:after{background:linear-gradient(180deg,rgba(8,10,14,.55) 0%,rgba(8,10,14,.82) 100%)}
  .hero h1{font-size:18px;line-height:1.55}
  .hero p{font-size:11px}
  .composer-card{display:none}
  .detail{padding:10px 14px 30px}
}

#installNav[hidden]{display:none}

.backadmin{display:inline-flex;align-items:center;gap:4px;background:#fff;border-radius:8px;padding:8px 14px;font-size:13px;color:#0f4c81;margin-bottom:10px;box-shadow:0 1px 4px rgba(0,0,0,.05)}
.backadmin:hover{background:#f7f9fc}