/* 马克LAB 个人网站 v5：服务型首页（参考 yichen.ai 的「产品与服务」先行）+ weichao.ren 的版式与细节，浅色默认 + 暗色切换，系统字体。 */
:root{
  color-scheme:light;
  --bg:#FAFAFA; --surface:#FFFFFF; --surface-2:#F4F4F5; --ink:#0A0A0A; --muted:#525252; --dim:#8A8A8A;
  --line:#E5E5E5; --line-2:#D4D4D4; --header-bg:rgba(250,250,250,.86);
  --accent:#2453D6; --accent-hover:#1B43B3; --accent-ink:#FFFFFF; --accent-soft:#EAF0FF;
  --pass:#15803D;
  --todo-bg:#FFF4D6; --todo-fg:#8A5A00; --todo-line:#E0B44C;
  --f-body:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
  --f-mono:ui-monospace,"SF Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.16,1,.3,1);
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#111214; --surface:#1A1B1E; --surface-2:#232428; --ink:#E8E8E8; --muted:#A3A3A3; --dim:#737373;
  --line:#2E3035; --line-2:#3C3E44; --header-bg:rgba(17,18,20,.86);
  --accent:#8AA8FF; --accent-hover:#A9C0FF; --accent-ink:#0B1430; --accent-soft:rgba(138,168,255,.14);
  --pass:#4ADE80;
  --todo-bg:rgba(255,190,60,.14); --todo-fg:#FFC95C; --todo-line:rgba(255,201,92,.45);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#111214; --surface:#1A1B1E; --surface-2:#232428; --ink:#E8E8E8; --muted:#A3A3A3; --dim:#737373;
    --line:#2E3035; --line-2:#3C3E44; --header-bg:rgba(17,18,20,.86);
    --accent:#8AA8FF; --accent-hover:#A9C0FF; --accent-ink:#0B1430; --accent-soft:rgba(138,168,255,.14);
    --pass:#4ADE80;
    --todo-bg:rgba(255,190,60,.14); --todo-fg:#FFC95C; --todo-line:rgba(255,201,92,.45);
  }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;transition:background-color .2s,color .2s}
a{color:inherit}
h1,h2,h3{margin:0;line-height:1.3;text-wrap:balance}
p{margin:0}
::selection{background:var(--accent);color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--f-mono)}
.todo{background:var(--todo-bg);color:var(--todo-fg);border:1px dashed var(--todo-line);border-radius:4px;padding:0 .35em;font-size:.9em}
.wrap{max-width:880px;margin:0 auto;padding-left:max(24px,env(safe-area-inset-left,0px));padding-right:max(24px,env(safe-area-inset-right,0px))}
.wrap.wide{max-width:1080px}
.wrap.narrow{max-width:720px}

/* 顶栏 */
header.top{position:sticky;top:0;z-index:20;background:var(--header-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.top .bar{max-width:1200px;margin:0 auto;padding:10px max(24px,env(safe-area-inset-right,0px)) 10px max(24px,env(safe-area-inset-left,0px));display:flex;align-items:center;justify-content:space-between;gap:8px 16px;flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none}
.brand b{color:var(--ink);font-size:19px;font-weight:600}
.brand small{font-family:var(--f-mono);font-size:12px;color:var(--dim)}
.nav{display:flex;align-items:center;gap:6px 22px;flex-wrap:wrap;font-size:15px}
.nav a{text-decoration:none;color:var(--muted);padding:4px 0;transition:color .18s var(--ease)}
.nav a:hover{color:var(--ink)}
.nav a[aria-current="page"]:not(.nav-cta){color:var(--ink);box-shadow:inset 0 -2px 0 var(--accent)}
.nav a.nav-cta{background:var(--accent);color:var(--accent-ink);font-weight:500;padding:6px 14px;border-radius:8px;transition:background-color .18s var(--ease),transform .18s var(--ease)}
.nav a.nav-cta:hover{background:var(--accent-hover);transform:translateY(-1px)}
.theme-btn{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:8px;background:none;color:var(--muted);cursor:pointer;transition:border-color .18s var(--ease),color .18s var(--ease)}
.theme-btn:hover{border-color:var(--line-2);color:var(--ink)}
.theme-btn svg{width:19px;height:19px}
.theme-btn .sun{display:none}
:root[data-theme="dark"] .theme-btn .sun{display:block}
:root[data-theme="dark"] .theme-btn .moon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme-btn .sun{display:block}
  :root:not([data-theme="light"]) .theme-btn .moon{display:none}
}
svg.i{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* 按钮 */
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-size:15px;font-weight:500;text-decoration:none;border:1px solid var(--line-2);background:var(--surface);color:var(--ink);cursor:pointer;font-family:var(--f-body);transition:background-color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease)}
.btn:hover{border-color:var(--ink);transform:translateY(-1px)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}

/* 首屏 */
.hero{padding:72px 0 40px}

.hero h1{font-size:clamp(30px,4.6vw,42px);font-weight:600;letter-spacing:-.01em}
.hero .lede{margin-top:20px;color:var(--muted);max-width:34em}
.hero .btns{margin-top:28px}

/* 徽章 */
.badge{display:inline-flex;align-items:center;font-size:12px;font-weight:500;padding:1px 8px;border-radius:6px;background:var(--accent-soft);color:var(--accent);white-space:nowrap}
.badge.gray{background:var(--surface-2);color:var(--muted)}

/* 精选大卡（B） */

.thumb{aspect-ratio:16/10;border-radius:8px;background:var(--surface-2);border:1px dashed var(--line-2);display:flex;align-items:center;justify-content:center;text-align:center;color:var(--dim);font-family:var(--f-mono);font-size:12px;padding:8px}

/* 子页标题 */
.page-head{padding:72px 0 8px}
.page-head h1{font-size:clamp(34px,5vw,52px);font-weight:600;letter-spacing:-.01em}
.page-head p{margin-top:16px;color:var(--muted);max-width:34em}

.counts{display:flex;gap:6px 20px;flex-wrap:wrap;margin-top:16px;font-family:var(--f-mono);font-size:13px;color:var(--dim)}
.counts b{color:var(--ink);font-weight:600}
hr.div{border:0;border-top:1px solid var(--line);margin:32px 0}

/* 作品页（B 项目页） */
.group{padding:24px 0}
.group-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.group-head h2{font-size:19px;font-weight:600}
.group-head span{font-size:14px;color:var(--dim)}
.pgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pcard{display:grid;grid-template-columns:132px 1fr;gap:16px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--surface);min-width:0;transition:border-color .18s var(--ease),background-color .18s var(--ease)}
.pcard:hover{border-color:var(--accent);background:var(--surface-2)}
.pcard .thumb{aspect-ratio:4/3}
.pcard .t{display:flex;align-items:center;gap:8px;font-weight:600}
.dot{width:8px;height:8px;border-radius:50%;flex:none;background:var(--dim)}
.dot.doing{background:var(--accent)}

.pcard p{color:var(--muted);font-size:14px;margin-top:6px}
.meta{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin-top:10px;font-family:var(--f-mono);font-size:12px;color:var(--dim)}
.empty{padding:22px;border:1px dashed var(--line-2);border-radius:12px;color:var(--dim);font-size:15px;text-align:center}

/* 关于页 */
.intro{font-size:19px;line-height:1.7;margin-top:28px}
.intro-sub{margin-top:14px;color:var(--muted)}
.intro-sub a{color:var(--ink)}
.h2s{font-size:20px;font-weight:600;margin-bottom:16px}
.checks{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.checks div{padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.checks b{display:flex;align-items:center;gap:8px;font-weight:600}
.checks b::before{content:"✓";font-family:var(--f-mono);color:var(--pass)}
.checks p{margin-top:4px;color:var(--muted);font-size:14px}
.stances{list-style:none;margin:0;padding:0;counter-reset:st;border-top:1px solid var(--line)}
.stances li{counter-increment:st;display:grid;grid-template-columns:36px 1fr;padding:16px 0;border-bottom:1px solid var(--line);font-weight:600}
.stances li::before{content:"0" counter(st);font-family:var(--f-mono);font-size:13px;font-weight:400;color:var(--accent);padding-top:3px}
.stances small{grid-column:2;display:block;font-weight:400;font-size:15px;color:var(--muted);margin-top:4px}
.ctable{border-top:1px solid var(--line)}
.crow{display:grid;grid-template-columns:84px 1fr auto;gap:12px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.crow > span:first-child{color:var(--muted)}
.crow .v{min-width:0;overflow-wrap:anywhere}
.crow .v small{display:block;font-size:13px;color:var(--dim)}
.crow a.v{text-decoration:none}
.crow a.v:hover{color:var(--accent)}
.copy{font-size:13px;color:var(--muted);background:var(--surface);border:1px solid var(--line-2);border-radius:6px;padding:3px 10px;cursor:pointer;font-family:var(--f-body);transition:border-color .18s var(--ease),color .18s var(--ease)}
.copy:hover{border-color:var(--ink);color:var(--ink)}
.wx-box{display:flex;gap:20px;align-items:center;margin-top:20px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.qr{width:120px;height:120px;flex:none;display:flex;align-items:center;justify-content:center;text-align:center;font-size:12px;line-height:1.5;background:var(--todo-bg);color:var(--todo-fg);border:1px dashed var(--todo-line);border-radius:8px}
.wx-box b{font-weight:600}
.wx-box p{color:var(--muted);font-size:14px;margin-top:4px}

/* 页脚（B） */
footer.bottom{margin-top:64px;border-top:1px solid var(--line);background:var(--surface);font-size:14px}
.fcols{padding-block:44px 28px;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:24px}
.fcols div{display:flex;flex-direction:column;gap:10px;min-width:0}
.fcols .h{color:var(--dim);font-size:13px;margin-bottom:4px}
.fcols a,.fcols span.p{color:var(--muted);text-decoration:none}
.fcols a:hover{color:var(--ink)}
.fbrand{color:var(--ink);font-size:19px;font-weight:600}
.fcols .mono{color:var(--dim);font-size:13px}
.legal{border-top:1px solid var(--line);padding-block:18px 32px;color:var(--dim);font-size:13px}

/* 入场（B：0.7s 淡入，卡片错峰） */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .reveal.in{opacity:1;transform:none}
.js .reveal:nth-child(2){transition-delay:.06s}
.js .reveal:nth-child(3){transition-delay:.12s}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important}
  .js .reveal{opacity:1;transform:none}
  .btn:hover,.nav a.nav-cta:hover{transform:none}
}
@media (max-width:760px){
  .hero{padding:48px 0 28px}
  
  .page-head{padding-top:48px}
  
  .pgrid,.checks{grid-template-columns:1fr}
  
  
  .fcols{grid-template-columns:1fr 1fr}
  .fcols div:first-child{grid-column:span 2}
  .nav{gap:4px 14px;font-size:14px}
  .brand small{display:none}
}
@media (max-width:440px){
  
  
  
  .pcard{grid-template-columns:1fr}
  .pcard .thumb{aspect-ratio:16/7}
  .crow{grid-template-columns:64px 1fr auto}
  .wx-box{flex-direction:column;align-items:flex-start}
}

/* 导航：桌面横排，手机收进菜单 */
header.top .bar{position:relative}
.links{display:flex;align-items:center;gap:6px 22px}
.menu-btn{display:none;width:36px;height:36px;align-items:center;justify-content:center;border:1px solid var(--line-2);border-radius:8px;background:none;color:var(--ink);cursor:pointer}
.menu-btn svg{width:18px;height:18px}

/* 首屏 */

.creds{display:flex;flex-wrap:wrap;gap:6px 0;margin-top:28px;font-size:14px;color:var(--muted)}
.creds span{display:inline-flex;align-items:center}
.creds span+span::before{content:"";width:1px;height:12px;background:var(--line-2);margin:0 14px}

/* 文章页 */

@media (max-width:760px){
  
  
  
  
  .jsok .menu-btn{display:inline-flex}
  .jsok .links{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;padding:4px 24px 12px;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.08)}
  .jsok header.top.open .links{display:flex}
  .jsok .links a{padding:12px 0;border-bottom:1px solid var(--line);font-size:16px}
  .jsok .links a:last-child{border-bottom:0}
  .jsok .links a[aria-current="page"]{box-shadow:none;color:var(--accent)}
  .jsok header.top .bar{flex-wrap:nowrap}
  .jsok .nav{flex-wrap:nowrap;gap:8px}
}

/* ===== v7：联系我弹窗 ===== */
.contact-dlg{width:min(440px,calc(100% - 32px));max-height:calc(100% - 48px);padding:0;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);box-shadow:0 24px 60px rgba(0,0,0,.25)}
.contact-dlg::backdrop{background:rgba(10,10,10,.45);backdrop-filter:blur(3px)}
.contact-dlg[open]{animation:dlg-in .22s var(--ease)}
@keyframes dlg-in{from{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}
.dlg-head{display:flex;justify-content:space-between;align-items:center;padding:18px 20px 0}
.dlg-head h2{font-size:20px;font-weight:600}
.dlg-close{width:32px;height:32px;border:1px solid var(--line);border-radius:8px;background:none;color:var(--muted);cursor:pointer;font-size:14px}
.dlg-close:hover{color:var(--ink);border-color:var(--line-2)}
.dlg-wx{display:flex;gap:16px;align-items:center;margin:16px 20px 0;padding:16px;border:1px solid var(--accent);border-radius:12px}
.dlg-wx .qr{width:104px;height:104px}
.dlg-wx b{font-weight:600}
.dlg-wx p{font-size:13px;color:var(--muted);margin:2px 0 6px}
.dlg-wx .v{font-size:14px;margin-right:8px}
.dlg-list{list-style:none;margin:8px 20px 0;padding:0}
.dlg-list li{display:grid;grid-template-columns:64px 1fr auto;gap:10px;align-items:center;padding:11px 0;border-bottom:1px solid var(--line);font-size:15px}
.dlg-list li:last-child{border-bottom:0}
.dlg-list li > span:first-child{color:var(--muted);font-size:14px}
.dlg-list a{color:var(--accent);text-decoration:none}
.dlg-list b{font-weight:500;overflow-wrap:anywhere}
.dlg-list small{font-size:12px;color:var(--dim);text-align:right}

@media (prefers-reduced-motion:reduce){.contact-dlg[open]{animation:none}}
@media (max-width:440px){.dlg-wx{flex-direction:column;align-items:flex-start}.dlg-list li{grid-template-columns:56px 1fr}.dlg-list small{grid-column:2;text-align:left}}

/* ===== v10：一屏首页 ===== */
body.home{min-height:100vh;display:flex;flex-direction:column}
body.home main{flex:1;display:flex;align-items:center}
body.home main > .wrap{width:100%}
body.home .hero{padding:48px 0 0}
body.home footer.bottom{margin-top:0;background:transparent;border-top:0}
body.home .fcols{display:none}
body.home .legal{border-top:0;padding-block:16px 24px;display:flex;justify-content:space-between;gap:8px 16px;flex-wrap:wrap}
.entries{display:grid;grid-template-columns:1fr;gap:12px;margin-top:44px;padding-bottom:40px}
.entry{display:flex;flex-direction:column;gap:4px;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface);text-decoration:none;transition:border-color .18s var(--ease),background-color .18s var(--ease)}
.entry:hover{border-color:var(--accent);background:var(--surface-2)}
.entry small{font-size:12px;color:var(--dim);display:flex;justify-content:space-between;align-items:center}
.entry small span{color:var(--accent);font-size:16px;transition:transform .18s var(--ease)}
.entry:hover small span{transform:translateX(3px)}
.entry b{font-weight:600;font-size:16px}
.entry p{font-size:14px;color:var(--muted)}
/* 矮屏电脑（1280×720 等）：收紧首页纵向间距，保证一屏看完 */
@media (min-width:761px) and (max-height:780px){
  body.home .hero{padding-top:20px}
  .hero .btns{margin-top:22px}
  .creds{margin-top:20px}
  .entries{margin-top:28px}
}
@media (max-width:760px){
  body.home .hero{padding-top:24px}
  .entries{grid-template-columns:1fr;gap:8px;margin-top:24px}
  .entry{padding:12px 16px}
  .entry p{display:none}
}

/* ===== v12+：页头头像。现在是待补占位，拿到文件后换成 <img class="avatar" src="avatar.png" alt=""> ===== */
.avatar{width:28px;height:28px;border-radius:50%;flex:none;align-self:center;object-fit:cover}

/* ===== v11：文章目录（参考 yichen 精选页结构） ===== */
.lib{display:grid;grid-template-columns:230px 1fr;gap:56px;padding-top:40px}
.lib-side{position:sticky;top:76px;align-self:start;display:flex;flex-direction:column;gap:14px}
.lib-side .t{display:flex;justify-content:space-between;align-items:baseline}
.lib-side .t b{font-size:18px;font-weight:600}
.lib-side .t span{font-size:12px;color:var(--dim)}

.lib-main h1{font-size:clamp(30px,4vw,40px);font-weight:600}
.lib-main > p{margin-top:12px;color:var(--muted);font-size:15px}
.lib-main h2{font-size:22px;font-weight:600;margin-top:44px}
.lib-main h3{font-size:18px;font-weight:600;margin-top:28px;display:flex;align-items:baseline;gap:8px}
.lib-main h3 small{font-size:12px;font-weight:400;color:var(--dim)}

@media (max-width:860px){
  .lib{grid-template-columns:1fr;gap:28px;padding-top:28px}
  .lib-side{position:static}
}

/* 工作微信二维码图片：覆盖 .qr 的黄框占位样式 */
.qr.qr-img{display:block;background:none;border:0;padding:0;object-fit:contain}

/* ===== 文章页：左侧文章导航 + 右侧长文简介 + 站外下载链接 ===== */
.art-nav{display:flex;flex-direction:column;gap:2px}
.art-nav .grp{font-size:12px;color:var(--dim);margin:6px 0 4px}
.art-nav a{display:flex;flex-direction:column;padding:8px 10px;border-radius:8px;color:var(--muted);text-decoration:none;font-size:14px;line-height:1.5;border-left:2px solid transparent;transition:background-color .18s var(--ease),color .18s var(--ease)}
.art-nav a small{font-size:12px;color:var(--dim)}
.art-nav a:hover{background:var(--surface-2);color:var(--ink)}
.art-nav a[aria-current="true"]{color:var(--ink);background:var(--surface-2);border-left-color:var(--accent);font-weight:500}
.art-full{max-width:720px}
.art-full .art-meta{font-family:var(--f-mono);font-size:13px;color:var(--dim)}
.art-full h1{margin-top:8px}
.art-full .art-lead{margin-top:14px;color:var(--ink);font-size:17px}
.art-full > p{margin-top:12px;color:var(--muted);font-size:16px}
.art-full h3 small{font-family:var(--f-mono)}
.art-list{margin:12px 0 0;padding-left:1.2em;color:var(--muted);display:flex;flex-direction:column;gap:6px}
.art-list li::marker{color:var(--accent)}
.toc{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);font-size:15px}
.toc summary{cursor:pointer;color:var(--accent);list-style:none;font-weight:500}
.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:" ›";display:inline-block;transition:transform .18s var(--ease)}
.toc[open] summary::after{transform:rotate(90deg)}
.toc ol{margin:12px 0 0;padding-left:1.8em;color:var(--muted);display:flex;flex-direction:column;gap:6px}
.art-dl{margin-top:22px;display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap}
@media (max-width:860px){
  .art-nav{flex-direction:row;flex-wrap:wrap;gap:8px}
  .art-nav .grp{display:none}
  .art-nav a{border:1px solid var(--line);border-left-width:1px}
  .art-nav a[aria-current="true"]{border-color:var(--accent)}
}
.art-dl-note{font-size:13px;color:var(--dim)}
.art-list b{color:var(--ink);font-weight:600;margin-right:4px}
.crow a.v{color:var(--accent);text-decoration:none}
.crow a.v:hover{text-decoration:underline;text-underline-offset:3px}