:root{--bg:#fafafb;--fg:#17171c;--mut:#6b7080;--card:#fff;--bd:#e6e7ee;--ac:#6d5efc;--ac2:#4f46e5;--chip:#f3f3f8}
:root.dark{--bg:#0b0b10;--fg:#f1f1f6;--mut:#9ea1b3;--card:#16161d;--bd:#262632;--ac:#8b7dff;--ac2:#b3a9ff;--chip:#16161d}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--bd)}
.bar{display:flex;align-items:center;gap:16px;height:56px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;white-space:nowrap}.brand img{height:28px;width:auto}.brand span{font-size:14px;color:var(--mut);font-weight:600}
.sib{margin-left:auto;display:flex;align-items:center;gap:4px;font-size:15px;color:var(--mut)}.sib a{padding:6px 10px;border-radius:8px;white-space:nowrap}.sib a:hover,.sib a.active{color:var(--ac)}.sib a.active{font-weight:600}
.icon.menu-btn{display:none;flex-direction:column;justify-content:center;align-items:center;gap:4px}.menu-btn span{display:block;width:16px;height:2px;background:currentColor;border-radius:2px}
.icon{display:inline-flex;align-items:center;justify-content:center;background:none;border:1px solid var(--bd);color:var(--fg);border-radius:8px;width:34px;height:34px;cursor:pointer;font-size:16px}
.hero{padding:44px 0 18px;text-align:center}.hero h1{margin:0 0 8px;font-size:clamp(26px,5vw,38px)}.hero p{margin:0 auto;color:var(--mut);max-width:640px}.hero.sm{padding:28px 0 10px}
.search{display:flex;gap:8px;max-width:640px;margin:18px auto}.search input{flex:1;min-width:0;padding:11px 14px;border:1px solid var(--bd);border-radius:10px;background:var(--card);color:var(--fg);font:inherit}
.search input:focus{outline:2px solid var(--ac);outline-offset:-1px}
.btn{display:inline-block;padding:7px 14px;border-radius:9px;border:1px solid var(--ac);background:var(--ac);color:#fff;font:inherit;font-size:14px;cursor:pointer}
.btn:hover{filter:brightness(1.08)}.btn.ghost{background:transparent;color:var(--ac2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:6px 0 18px}.chip{padding:5px 12px;border:1px solid var(--bd);border-radius:99px;background:var(--chip);font-size:13px}
.chip i{font-style:normal;color:var(--mut);margin-left:2px}.chip:hover,.chip.on{border-color:var(--ac);color:var(--ac2)}.chip.on{background:color-mix(in srgb,var(--ac) 12%,transparent)}
.sortbar{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;color:var(--mut);font-size:13px;margin-bottom:12px}.sorts a{margin-left:12px}.sorts a.on{color:var(--ac2);font-weight:600}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(310px,100%),1fr));gap:14px}
.card{min-width:0;overflow-wrap:anywhere;display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--bd);border-radius:14px;padding:16px;transition:border-color .15s,transform .15s}
.card:hover{border-color:var(--ac);transform:translateY(-1px)}.card.feat{border-left:3px solid var(--ac)}
.ch{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.ch h3{margin:0;font-size:16px;margin-right:auto;word-break:break-word}.ch h3 a:hover{color:var(--ac)}
.badge{font-size:11px;padding:1px 7px;border-radius:99px;border:1px solid var(--bd);color:var(--mut)}.badge.star{background:var(--ac);border-color:var(--ac);color:#fff}
.desc{margin:0;color:var(--mut);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:12px;color:var(--mut)}.meta .cat:hover{color:var(--ac)}.stars{margin-left:auto;color:var(--ac2);font-weight:600}
.tag{display:inline-block;font-size:11px;padding:0 7px;border-radius:6px;background:var(--chip);border:1px solid var(--bd);margin-right:4px}
.act{display:flex;gap:8px}.empty{text-align:center;color:var(--mut);padding:48px 0}
.pager{display:flex;justify-content:center;align-items:center;gap:12px;margin:28px 0}.pg{padding:6px 14px;border:1px solid var(--bd);border-radius:9px;background:var(--card)}a.pg:hover{border-color:var(--ac)}.pg.cur{border:0;background:none;color:var(--mut)}
.crumb{margin:20px 0 8px;color:var(--mut);font-size:13px}.crumb a:hover{color:var(--ac)}
.detail{background:var(--card);border:1px solid var(--bd);border-radius:16px;padding:24px;margin-bottom:24px}.detail h1{margin:0 0 8px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.lead{font-size:16px;margin:0 0 16px}.facts{display:flex;flex-wrap:wrap;gap:12px 32px;margin:0 0 16px}.facts dt{font-size:12px;color:var(--mut)}.facts dd{margin:0;font-weight:600}
.h2{font-size:18px;margin:28px 0 12px}.foot{color:var(--mut);font-size:13px;text-align:center;padding:36px 16px 48px;border-top:1px solid var(--bd);margin-top:40px}.foot p{margin:4px 0}.foot a:hover{color:var(--ac)}

@media(max-width:860px){
 .bar{gap:10px}.icon.menu-btn{display:inline-flex}.icon{flex:none}
 .sib{display:none;position:absolute;left:0;right:0;top:56px;margin:0;flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 12px;background:var(--bg);border-bottom:1px solid var(--bd);box-shadow:0 12px 24px rgba(0,0,0,.08)}
 .sib.open{display:flex}.sib a{padding:12px 4px;border-radius:0;border-bottom:1px solid var(--bd);font-size:16px}.sib a:last-child{border-bottom:0}
 #theme{margin-left:auto}
}
@media(max-width:640px){
 .brand span{display:none}.brand img{height:24px}.hero{padding:28px 0 12px}.hero p{font-size:14px}
 .grid{grid-template-columns:1fr}.sortbar{flex-direction:column;align-items:flex-start}.sorts a{margin:0 14px 0 0}
 .chips{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;margin-inline:-16px;padding:2px 16px 8px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}.chip{flex:none}
 .detail{padding:16px}.facts{gap:10px 20px}.act .btn{flex:1;text-align:center}.search .btn{padding:7px 12px}
}
@media(max-width:360px){.wrap{padding:0 12px}.chips{margin-inline:-12px;padding-inline:12px}.brand img{height:22px}}
/* shared main-site logo has dark lettering: flip lightness in dark mode, keep hues (same as digest) */
.dark .brand img{filter:invert(1) hue-rotate(180deg) brightness(1.15) saturate(1.1)}

/* AI site additions */
.ch img.av{width:24px;height:24px;border-radius:6px;flex:none;background:var(--chip)}.facts .mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}
.hero .sub{margin-top:10px;font-size:13px}.hero .sub a{color:var(--ac2)}

/* 「开源」二级菜单（与主站 viaai.si 一致）：桌面悬停/聚焦展开，触屏平板首次点击展开，手机平铺 */
.sib .has-sub{position:relative;display:flex;align-items:center}
.sib .has-sub>a::after{content:"";display:inline-block;margin-left:5px;vertical-align:middle;border:4px solid transparent;border-top-color:currentColor;border-bottom-width:0;opacity:.55}
.sib .sub{position:absolute;top:100%;left:50%;z-index:20;min-width:168px;margin:0;padding:6px;list-style:none;background:var(--card);border:1px solid var(--bd);border-radius:12px;box-shadow:0 14px 28px rgba(0,0,0,.14);opacity:0;visibility:hidden;transform:translate(-50%,6px);transition:opacity .15s,transform .15s,visibility .15s}
.sib .has-sub:hover .sub,.sib .has-sub:focus-within .sub,.sib .has-sub.sub-open .sub{opacity:1;visibility:visible;transform:translate(-50%,0)}
.sib .sub a{display:block;padding:8px 12px;border-radius:8px;white-space:nowrap;color:var(--fg)}
.sib .sub a:hover,.sib .sub a.active{color:var(--ac);background:var(--chip)}
@media(max-width:860px){
 .sib .has-sub{flex-direction:column;align-items:stretch}.sib .has-sub>a::after{display:none}
 .sib .sub{position:static;min-width:0;padding:0;border:0;border-radius:0;background:none;box-shadow:none;opacity:1;visibility:visible;transform:none}
 .sib .sub a{padding:12px 4px 12px 24px;border-radius:0;border-bottom:1px solid var(--bd);font-size:15px;color:var(--mut)}
 .sib .sub a:hover,.sib .sub a.active{background:none}
}

@media(max-width:860px){.sib.open{max-height:calc(100dvh - 64px);overflow-y:auto}}