/* derong-v3：单栏阅读。配色见 docs/DESIGN.md：暖米白底、深灰正文，视频封面黄只用于细线与标记。版式来源 docs/prototypes/cuiderong-v3-20261027.html */
:root{
  --ground:#f6f2e8; --sheet:#fbf8f1; --text:#2b2b2b; --soft:#6b655a; --faint:#9a9284; --rule:#e2dbcb;
  --mark:#f5bf07; --mark-ink:#7a5c00; --link:#2b2b2b;
  --f-read:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong",serif;
  --f-latin:Georgia,"Times New Roman",serif;
  --f-ui:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --gh-font-heading:var(--f-read); --gh-font-body:var(--f-read);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ground:#1c1a17; --sheet:#23201c; --text:#e8e2d6; --soft:#b3aa9a; --faint:#857d70; --rule:#3a352e; --mark:#e8b10a; --mark-ink:#f2c94c; --link:#e8e2d6; color-scheme:dark}}
:root[data-theme="dark"]{
  --ground:#1c1a17; --sheet:#23201c; --text:#e8e2d6; --soft:#b3aa9a; --faint:#857d70; --rule:#3a352e; --mark:#e8b10a; --mark-ink:#f2c94c; --link:#e8e2d6; color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ground);color:var(--text);font-family:var(--f-ui);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration-color:var(--mark);text-decoration-thickness:2px;text-underline-offset:4px}
:focus-visible{outline:2px solid var(--mark);outline-offset:3px}
img{max-width:100%;height:auto}
.col{max-width:41rem;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}

/* header */
header.site{position:sticky;top:0;z-index:5;background:var(--ground);border-bottom:1px solid var(--rule)}
header.site .col{display:flex;align-items:center;gap:20px;padding-block:14px;max-width:46rem}
.brand{font-family:var(--f-read);font-weight:700;font-size:19px;letter-spacing:.06em;text-decoration:none;margin-right:auto}
.plus-link{font-size:15px;font-weight:500;text-decoration:none;padding:3px 0;border-bottom:2px solid transparent}
.plus-link[aria-current]{border-bottom-color:var(--mark)}
.plus-link sup{font-size:10px;color:var(--mark-ink);margin-left:1px}
.acct{display:inline-block;font:inherit;font-size:14px;line-height:1.6;background:transparent;border:1px solid var(--text);color:var(--text);border-radius:999px;padding:3px 14px;cursor:pointer;text-decoration:none;text-align:center}
.acct.solid{background:var(--text);color:var(--ground)}
.acct[disabled]{opacity:.45;cursor:not-allowed}

/* feed */
.feed{padding-block:8px 48px}
.item{padding-block:40px 36px;border-bottom:1px solid var(--rule)}
.meta{font-size:13px;color:var(--faint);letter-spacing:.02em;display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline}
.meta .who{color:var(--soft);font-weight:500}
.meta .kind{color:var(--mark-ink);text-decoration:none}
.item h2{font-family:var(--f-read);font-weight:700;font-size:23px;line-height:1.5;margin:10px 0 14px;text-wrap:balance;letter-spacing:.01em}
.prose{font-family:var(--f-read);font-size:18px;line-height:1.95;letter-spacing:.01em}
.prose p{margin:0 0 1em}
.prose b{font-weight:600}
.facts{list-style:none;margin:4px 0 1.1em;padding:0}
.facts li{font-family:var(--f-read);font-size:17px;line-height:1.85;padding:8px 0 8px 16px;border-left:2px solid var(--rule);margin-bottom:4px}
.facts li strong{font-weight:700;font-variant-numeric:tabular-nums}
.facts li .q{color:var(--faint);font-size:14px}
.item blockquote{margin:1.3em 0;padding:0 0 0 18px;border-left:3px solid var(--mark)}
.item blockquote p{margin:0;font-family:var(--f-latin);font-style:italic;font-size:17.5px;line-height:1.7}
.item blockquote .zh{font-family:var(--f-read);font-style:normal;font-size:15.5px;color:var(--soft);margin-top:6px}
.tbl{overflow-x:auto;margin:6px 0 1.2em}
.tbl table{border-collapse:collapse;width:100%;font-size:15px;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--rule)}
.tbl th{font-weight:500;color:var(--faint);font-size:13px}
.tbl td.n{text-align:right;font-weight:600;white-space:nowrap}
.src{font-size:13.5px;color:var(--faint);margin-top:4px}
.src a{color:var(--soft)}
.end{font-size:13px;color:var(--faint);text-align:center;padding-block:36px}

/* plus & lists */
.plus-hero{padding-block:48px 28px;border-bottom:1px solid var(--rule)}
.plus-hero .eyebrow{font-size:13px;letter-spacing:.12em;color:var(--mark-ink)}
.plus-hero h1{font-family:var(--f-read);font-weight:700;font-size:clamp(28px,5vw,36px);line-height:1.35;margin:8px 0 12px}
.plus-hero p{font-family:var(--f-read);font-size:17px;color:var(--soft);margin:0 0 20px;max-width:34em}
.plans{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:8px}
@media (max-width:560px){.plans{grid-template-columns:1fr}}
.plan{border:1px solid var(--rule);background:var(--sheet);border-radius:10px;padding:18px;display:flex;flex-direction:column}
.plan.pro{border-color:var(--text)}
.plan h3{margin:0 0 4px;font-size:16px}
.plan .price{font-family:var(--f-read);font-size:22px;font-weight:700;margin:4px 0 8px}
.plan ul{margin:0 0 14px;padding-left:1.1em;font-size:14.5px;color:var(--soft);flex:1}
.plan .acct{width:100%}
.posts{list-style:none;margin:0 0 48px;padding:0}
.posts li{padding:20px 0;border-bottom:1px solid var(--rule);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 16px;align-items:baseline}
.posts .t{font-family:var(--f-read);font-weight:600;font-size:18px;line-height:1.55;text-decoration:none}
.posts .t:hover{text-decoration:underline;text-decoration-color:var(--mark)}
.posts .d{font-size:13px;color:var(--faint);white-space:nowrap}
.posts .x{grid-column:1/-1;font-size:14.5px;color:var(--soft);margin:0}
.lock{font-size:12px;color:var(--mark-ink);border:1px solid var(--mark);border-radius:3px;padding:0 5px;margin-left:8px;vertical-align:2px;font-family:var(--f-ui);font-weight:500;white-space:nowrap}
.sec-h{font-size:13px;letter-spacing:.12em;color:var(--faint);margin:36px 0 0;font-weight:400}
.pagination{display:flex;justify-content:space-between;font-size:14px;color:var(--faint);margin:-24px 0 48px}

/* article */
.article{padding-block:44px 24px}
.article-head .meta{margin-bottom:6px}
.article-head .lock{margin-left:0}
.article-title{font-family:var(--f-read);font-weight:700;font-size:clamp(26px,4.6vw,32px);line-height:1.45;margin:6px 0 16px;text-wrap:balance}
.article-excerpt{font-family:var(--f-ui);font-size:15px;line-height:1.7;color:var(--soft);margin:0 0 32px;padding-left:14px;border-left:2px solid var(--rule)}
.gh-content{font-family:var(--f-read);font-size:18px;line-height:1.95;letter-spacing:.01em;overflow-wrap:break-word}
.gh-content>*{margin:0 0 1.1em}
.gh-content h2{font-size:23px;line-height:1.5;margin:1.8em 0 .7em}
.gh-content h3{font-size:20px;line-height:1.5;margin:1.6em 0 .6em}
.gh-content h4{font-size:18px;margin:1.4em 0 .5em}
.gh-content ul,.gh-content ol{padding-left:1.4em}
.gh-content li{margin-bottom:.4em}
.gh-content blockquote{margin-left:0;padding-left:18px;border-left:3px solid var(--mark);color:var(--soft)}
.gh-content hr{border:0;border-top:1px solid var(--rule);margin:2em 0}
.gh-content figure{margin-inline:0}
.gh-content figcaption{font-family:var(--f-ui);font-size:13.5px;color:var(--faint);text-align:center;margin-top:8px}
.gh-content pre{overflow-x:auto;background:var(--sheet);border:1px solid var(--rule);border-radius:6px;padding:12px;font-size:14px;line-height:1.6}
.gh-content table{border-collapse:collapse;display:block;overflow-x:auto;font-size:15px}
.gh-content th,.gh-content td{padding:8px 10px;border-bottom:1px solid var(--rule);text-align:left}
.kg-width-wide,.kg-width-full{max-width:100%}
.kg-width-wide img,.kg-width-full img{width:100%}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:48px;padding-top:24px;border-top:1px solid var(--rule)}
.article-nav a{font-family:var(--f-read);font-size:16px;line-height:1.55;text-decoration:none}
.article-nav a span{display:block;font-family:var(--f-ui);font-size:13px;color:var(--faint);margin-bottom:4px}
.article-nav .next{grid-column:2;text-align:right}

/* members gate */
.gate{margin:8px 0 24px;padding:24px 22px;border:1px solid var(--rule);border-top:3px solid var(--mark);background:var(--sheet);border-radius:10px;text-align:center;font-family:var(--f-ui)}
.gate-t{font-family:var(--f-read);font-weight:700;font-size:20px;margin:0 0 6px}
.gate-x{font-size:14.5px;color:var(--soft);margin:0 0 16px}
.gate-row{display:flex;flex-wrap:wrap;gap:12px 18px;justify-content:center;align-items:center}
.gate-row .acct{padding:6px 22px}
.gate-in{font-size:14px;color:var(--soft)}

/* channels（首页底部频道图标） */
.channel-section{margin-top:12px;padding-top:4px}
.channel-row{display:flex;gap:24px;align-items:flex-start;margin-top:16px}
.channel-item{position:relative}
.channel-trigger{display:flex;align-items:center;flex-direction:column;gap:10px;padding:12px 10px;min-width:66px;background:transparent;border:0;color:var(--soft);font:inherit;font-size:13px;cursor:pointer;text-decoration:none}
.channel-trigger img{opacity:.72;transition:opacity .15s}
.channel-trigger:hover,.channel-trigger:focus-visible{color:var(--text)}
.channel-trigger:hover img{opacity:1}
.channel-qr{display:none;position:absolute;bottom:calc(100% + 10px);left:50%;transform:translateX(-50%);padding:24px 14px 12px;width:230px;background:#fff;border:1px solid #e4dccd;border-radius:12px;box-shadow:0 8px 32px #2b2b2b18;z-index:40;text-align:center}
.channel-item.is-open .channel-qr{display:block}
.channel-item:last-child .channel-qr{left:auto;right:0;transform:none}
.channel-qr img{display:block;width:200px;height:200px;object-fit:contain}
.channel-qr p{margin:10px 0 0;font-size:13px;line-height:1.5;color:#786f63}
.channel-qr-close{position:absolute;right:6px;top:1px;width:28px;height:28px;border:0;background:transparent;color:#786f63;font-size:22px;line-height:28px;cursor:pointer}
@media (max-width:767px){
  .channel-row{justify-content:space-between;gap:0}
  .channel-trigger{min-width:0;padding:12px 6px;font-size:12px}
  .channel-qr,.channel-item:last-child .channel-qr{position:fixed;left:50%;right:auto;top:50%;bottom:auto;transform:translate(-50%,-50%)}
}

.site-foot{border-top:1px solid var(--rule);padding-block:24px 40px;font-size:13px;color:var(--faint);text-align:center}

@media (max-width:480px){.item h2{font-size:21px}.prose,.gh-content{font-size:17px}header.site .col{gap:14px}}