/* MK 的 AI 筆記｜清新版（2026-11-02）設計說明見 ../design/01_設計研究.md */
:root{
  color-scheme:light dark;
  --bg:#f8fafd;--surface:#fff;--soft:#f1f5fb;--navy:#0f1f5c;--ink:#2a3245;--mute:#6b7488;
  --link:#2f4fb8;--sky:#e8f0fe;--yellow:#ffd900;--cream:#fff8d6;--line:#e6ebf3;
  --code-bg:#1d2333;--code-ink:#e3e7f1;--inline-code:#eef2f8;
  --shadow:0 1px 2px rgba(15,31,92,.04),0 6px 20px rgba(15,31,92,.06);
  --shadow-h:0 2px 4px rgba(15,31,92,.05),0 14px 32px rgba(15,31,92,.10);
  --hero:linear-gradient(135deg,#eaf2ff 0%,#f6f9ff 55%,#fff9dc 100%);
  --top:rgba(255,255,255,.82);
  --read:680px;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#10141d;--surface:#171c28;--soft:#1c2232;--navy:#dfe6ff;--ink:#d3d9e6;--mute:#8f99ae;
    --link:#9fb5ff;--sky:#1d2740;--cream:#2a2615;--line:#262d3d;
    --code-bg:#0c1018;--code-ink:#e3e7f1;--inline-code:#232a3b;
    --shadow:0 1px 2px rgba(0,0,0,.3);--shadow-h:0 8px 24px rgba(0,0,0,.45);
    --hero:linear-gradient(135deg,#17213a 0%,#141a28 60%,#221f14 100%);
    --top:rgba(16,20,29,.82);
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:76px;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:17.5px/1.9 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;letter-spacing:.02em;overflow-wrap:break-word}
a{color:var(--link);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-color:var(--yellow);text-decoration-thickness:2px}
img{max-width:100%;height:auto}
:focus-visible{outline:2px solid var(--link);outline-offset:2px;border-radius:4px}

/* 閱讀進度條 */
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:30;pointer-events:none}
.progress i{display:block;height:100%;background:var(--yellow);transform-origin:0 50%;transform:scaleX(0)}

/* 頁首 */
.top{position:sticky;top:0;z-index:20;background:var(--top);-webkit-backdrop-filter:saturate(160%) blur(10px);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line);padding:10px 20px}
.top-in{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--navy);text-decoration:none;font-weight:700;letter-spacing:.03em;white-space:nowrap;min-width:0}
.brand img{border-radius:50%;width:34px;height:34px;flex:0 0 auto}
.topnav{display:flex;gap:4px;flex:0 0 auto}
.topnav a{color:var(--mute);text-decoration:none;font-size:15px;padding:4px 10px;border-radius:999px}
.topnav a:hover{color:var(--navy);background:var(--sky)}

main{max-width:calc(var(--read) + 40px);margin:0 auto;padding:26px 20px 48px}
main.home{max-width:1120px}
.crumbs{font-size:13px;color:var(--mute);margin:0 0 18px;display:flex;flex-wrap:wrap;gap:6px;align-items:center;letter-spacing:0}
.crumbs a{color:var(--mute);text-decoration:none}
.crumbs a:hover{color:var(--link)}
.crumbs span[aria-current]{color:var(--mute);opacity:.8;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}
.kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 12px;padding:3px 12px;background:var(--cream);color:var(--navy);font-weight:600;font-size:13px;border-radius:999px;text-decoration:none;letter-spacing:.04em}
.kicker::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--yellow);box-shadow:0 0 0 2px rgba(255,217,0,.25)}
h1{font-size:34px;line-height:1.38;margin:0 0 12px;color:var(--navy);letter-spacing:.01em}

/* 文章頁標頭 */
.post-head{margin:0 0 22px}
.sprog{display:flex;align-items:center;gap:10px;margin:-2px 0 14px;font-size:12px;color:var(--mute);letter-spacing:0}
.sprog span{flex:0 0 140px;height:4px;border-radius:4px;background:var(--line);overflow:hidden}
.sprog span i{display:block;height:100%;background:var(--yellow);border-radius:4px}
.meta{color:var(--mute);font-size:14px;margin:0 0 12px;letter-spacing:.01em;display:flex;flex-wrap:wrap;gap:4px 14px;align-items:center}
.meta a{color:var(--mute)}
.rt{display:inline-flex;align-items:center;gap:5px;color:var(--navy);font-weight:600}
.rt::before{content:"";width:13px;height:13px;border:1.6px solid currentColor;border-radius:50%;background:linear-gradient(currentColor,currentColor) 50% 30%/1.6px 4px no-repeat,linear-gradient(currentColor,currentColor) 65% 52%/3px 1.6px no-repeat;opacity:.85}
.tags{margin:0;display:flex;flex-wrap:wrap;gap:8px}
.tags a{font-size:13px;background:var(--sky);color:var(--link);padding:2px 11px;border-radius:999px;text-decoration:none;letter-spacing:0}
.tags a:hover{background:var(--cream);color:var(--navy)}
.cover{display:block;width:100%;border-radius:14px;margin:0 0 26px;box-shadow:var(--shadow)}
.lead{font-size:19px;line-height:1.8;color:var(--navy);margin:0 0 28px;padding:0 0 0 16px;border-left:3px solid var(--yellow)}

/* 目錄 */
.toc{background:var(--soft);border-radius:12px;padding:12px 18px;margin:0 0 34px;font-size:15px;line-height:1.7}
.toc summary{cursor:pointer;font-weight:700;color:var(--navy);font-size:14px;letter-spacing:.08em;list-style:none;display:flex;align-items:center;gap:8px}
.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:"";width:7px;height:7px;border-right:2px solid var(--mute);border-bottom:2px solid var(--mute);transform:rotate(45deg);margin:-3px 0 0 auto;transition:transform .2s}
.toc[open] summary::after{transform:rotate(-135deg);margin-top:3px}
.toc ol{margin:8px 0 2px;padding-left:0;list-style:none;counter-reset:t}
.toc ol ol{margin:2px 0 4px 14px;font-size:14px}
.toc li{margin:0}
.toc a{display:block;padding:3px 0 3px 12px;color:var(--ink);text-decoration:none;border-left:2px solid transparent;border-radius:0 4px 4px 0}
.toc ol ol a{color:var(--mute)}
.toc a:hover{color:var(--link)}
.toc a.on{border-left-color:var(--yellow);color:var(--navy);font-weight:600;background:linear-gradient(90deg,rgba(255,217,0,.12),transparent)}

/* 內文 */
article h2{font-size:24px;line-height:1.45;color:var(--navy);margin:2.4em 0 .7em;position:relative;padding-left:16px}
article h2::before{content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:5px;border-radius:5px;background:var(--yellow)}
article h3{font-size:19.5px;line-height:1.5;color:var(--navy);margin:1.9em 0 .5em}
article p,article li{margin:0 0 1.15em}
article li{margin-bottom:.45em}
article ul,article ol{padding-left:1.4em;margin:0 0 1.2em}
article li::marker{color:var(--mute)}
article strong{color:var(--navy);background:linear-gradient(transparent 62%,rgba(255,217,0,.38) 62%);padding:0 1px}
article a{overflow-wrap:anywhere}
article img{display:block;border-radius:10px;margin:1.4em auto}
article hr{border:0;height:1px;background:var(--line);margin:2.4em 0}
article blockquote{margin:1.6em 0;padding:14px 18px;background:var(--cream);border-left:3px solid var(--yellow);border-radius:0 10px 10px 0;color:var(--ink)}
article blockquote p:last-child{margin:0}
article code{background:var(--inline-code);padding:1px 6px;border-radius:5px;font-size:.86em;font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;letter-spacing:0;overflow-wrap:anywhere}
article pre{background:var(--code-bg);color:var(--code-ink);padding:16px 18px;border-radius:12px;overflow-x:auto;font-size:14px;line-height:1.65;margin:1.4em 0;max-width:100%;-webkit-overflow-scrolling:touch}
article pre code{background:none;padding:0;color:inherit;overflow-wrap:normal;white-space:pre;font-size:inherit}
.tablewrap{overflow-x:auto;margin:1.4em 0;border:1px solid var(--line);border-radius:12px;background:var(--surface);max-width:100%;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.6;letter-spacing:0}
th,td{border-bottom:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
th{background:var(--soft);color:var(--navy);font-weight:700;white-space:nowrap}
tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:color-mix(in srgb,var(--soft) 45%,transparent)}

/* FAQ／來源 */
.faq{margin-top:2.2em}
.faq h2{font-size:22px;color:var(--navy);margin:0 0 .7em}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px 16px;margin:0 0 10px}
.faq summary{font-weight:700;cursor:pointer;color:var(--navy)}
.faq details p{margin:.6em 0 .2em}
.source{margin:32px 0 0;padding:14px 0 0;border-top:1px dashed var(--line);font-size:14px;color:var(--mute);word-break:break-all;line-height:1.7}
.source p{margin:4px 0}

/* CTA */
.cta{margin:40px 0 0;background:var(--hero);border:1px solid var(--line);border-radius:18px;padding:24px 24px 22px;position:relative;overflow:hidden}
.cta::after{content:"";position:absolute;right:-40px;top:-40px;width:130px;height:130px;border-radius:50%;background:radial-gradient(circle,rgba(255,217,0,.35),rgba(255,217,0,0) 70%)}
.cta>*{position:relative;z-index:1}
.cta-h{margin:0 0 6px;font-size:21px;color:var(--navy);line-height:1.5}
.cta p{margin:0 0 10px;font-size:15px;color:var(--ink);line-height:1.75}
.social{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 0}
.sbtn{display:inline-flex;align-items:center;gap:7px;padding:8px 18px;border-radius:999px;background:#0f1f5c;color:#fff!important;font-weight:600;font-size:14px;text-decoration:none;line-height:1.4;letter-spacing:.02em;transition:background .15s,color .15s,transform .15s}
.sbtn::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--yellow)}
.sbtn:hover{background:var(--yellow);color:#0f1f5c!important;transform:translateY(-1px)}
.sbtn:hover::before{background:#0f1f5c}
.social-sm{margin-top:8px}
.social-sm .sbtn{padding:3px 12px;font-size:13px;background:var(--sky);color:var(--link)!important}
.social-sm .sbtn::before{display:none}
.nl{display:flex;gap:8px;margin:14px 0 0;flex-wrap:wrap}
.nl input{flex:1;min-width:180px;padding:9px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-size:15px}
.nl button{padding:9px 18px;border:0;border-radius:999px;background:var(--yellow);color:#0f1f5c;font:inherit;font-weight:700;font-size:15px;cursor:pointer}

/* 作者、上下篇 */
.author{display:flex;gap:14px;align-items:flex-start;margin:22px 0 0;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:14px;font-size:15px;line-height:1.75}
.author img{border-radius:50%;flex:0 0 56px}
.author p{margin:0}
.author-name{font-weight:700}
.author-name a{color:var(--navy);text-decoration:none}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:28px}
.pn a{display:block;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--navy);font-size:15px;line-height:1.55;font-weight:600;transition:box-shadow .15s,transform .15s}
.pn a small{display:block;color:var(--mute);font-weight:400;margin-bottom:2px}
.pn .next{text-align:right;background:var(--sky);border-color:transparent}
.pn .next small{color:var(--link);font-weight:600}
.pn a:hover{box-shadow:var(--shadow-h);transform:translateY(-2px)}

/* 區塊標題、卡片 */
.sec-h{font-size:22px;color:var(--navy);margin:48px 0 16px;display:flex;align-items:center;gap:10px;line-height:1.4}
.sec-h::before{content:"";width:5px;height:20px;background:var(--yellow);border-radius:5px}
.cards{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.card a{display:flex;flex-direction:column;height:100%;padding:18px 20px;background:var(--surface);border:1px solid var(--line);border-radius:16px;text-decoration:none;color:var(--ink);line-height:1.6;transition:box-shadow .2s,transform .2s,border-color .2s}
.card a:hover,.bigcard a:hover,.seriescard:hover,.catgrid a:hover,.eps a:hover{box-shadow:var(--shadow-h);transform:translateY(-2px);border-color:transparent}
.card b{font-size:17.5px;color:var(--navy);margin:8px 0 6px;line-height:1.5}
.card em{font-style:normal;font-size:14.5px;color:var(--mute);flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card time,.cardmeta{font-size:12.5px;color:var(--mute);margin-top:12px;letter-spacing:0}
.card-cat{display:inline-flex;align-items:center;gap:6px;align-self:flex-start;font-size:12.5px;font-weight:600;color:var(--link);letter-spacing:.03em}
.card-cat::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--link);opacity:.7}
.bigcard{margin:0 0 16px}
.bigcard a{display:grid;grid-template-columns:1.15fr 1fr;background:var(--surface);border:1px solid var(--line);border-radius:18px;overflow:hidden;text-decoration:none;color:var(--ink);transition:box-shadow .2s,transform .2s}
.bigcard img{display:block;width:100%;height:100%;object-fit:cover}
.bigcard-t{padding:24px 28px;display:flex;flex-direction:column;justify-content:center}
.bigcard h3{font-size:25px;line-height:1.45;color:var(--navy);margin:10px 0 10px}
.bigcard p{margin:0 0 12px;font-size:15.5px;color:var(--mute);line-height:1.75}
.bigcard time,.bigcard .cardmeta{font-size:13px;color:var(--mute)}

/* 首頁 hero */
.hero{background:var(--hero);border:1px solid var(--line);border-radius:24px;padding:40px 36px 34px;margin:6px 0 0;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-70px;top:-90px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(255,217,0,.28),rgba(255,217,0,0) 68%)}
.hero::after{content:"";position:absolute;right:70px;bottom:-120px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,rgba(47,79,184,.13),rgba(47,79,184,0) 70%)}
.hero>*{position:relative;z-index:1}
.hero .kicker{background:var(--surface)}
.hero h1{font-size:40px;margin:0 0 10px}
.hl{background:linear-gradient(transparent 60%,rgba(255,217,0,.6) 60%);padding:0 2px}
.hero p{color:var(--ink);margin:0;max-width:660px;font-size:17px;line-height:1.85}
.seriescard{display:grid;grid-template-columns:1fr 1.2fr;background:var(--surface);border:1px solid var(--line);border-radius:18px;overflow:hidden;text-decoration:none;color:var(--ink);transition:box-shadow .2s,transform .2s}
.seriescard img{display:block;width:100%;height:100%;object-fit:cover}
.seriescard div{padding:22px 26px}
.seriescard h3{margin:8px 0;color:var(--navy);font-size:23px;line-height:1.45}
.seriescard p{margin:0 0 12px;font-size:15px;color:var(--mute);line-height:1.8}
.more{font-weight:700;color:var(--link);font-size:15px}
.catgrid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.catgrid a{display:flex;flex-direction:column;padding:16px 18px;background:var(--surface);border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--ink);line-height:1.6;height:100%;transition:box-shadow .2s,transform .2s}
.catgrid b{color:var(--navy)}
.catgrid small{color:var(--mute);font-size:13px;flex:1}
.cnt{align-self:flex-start;font-size:12px;font-weight:600;color:var(--link);background:var(--sky);padding:1px 10px;border-radius:999px;margin-top:8px}

/* 列表頁 */
.listpage .intro{font-size:16px;color:var(--ink);background:var(--soft);border-radius:14px;padding:16px 18px;margin:0 0 24px;line-height:1.85}
.empty{color:var(--mute)}
.eps{list-style:none;padding:0;margin:20px 0 0}
.eps li{margin:0 0 12px}
.eps a{display:flex;gap:16px;align-items:flex-start;padding:16px 18px;background:var(--surface);border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--ink);transition:box-shadow .2s,transform .2s}
.eps .no{flex:0 0 44px;height:44px;border-radius:50%;background:var(--cream);color:var(--navy);font-weight:800;display:flex;align-items:center;justify-content:center;font-size:16px;letter-spacing:0}
.eps .t{display:flex;flex-direction:column;line-height:1.6;min-width:0}
.eps b{font-size:18px;color:var(--navy)}
.eps small{color:var(--mute);font-size:13px}
.eps em{font-style:normal;font-size:15px;color:var(--mute);margin-top:4px}

.foot{border-top:1px solid var(--line);text-align:center;color:var(--mute);font-size:14px;padding:28px 20px 44px;margin-top:20px;line-height:1.8}
.foot a{color:var(--mute)}
.foot p{margin:4px 0}
.foot-social{justify-content:center;margin:0 0 12px}
.small{font-size:12px}

/* 桌機：目錄移到右側 sticky */
@media (min-width:1240px){
  .post-body{display:grid;grid-template-columns:100% 210px;column-gap:44px}
  .post-body>article{grid-column:1;grid-row:1}
  .post-body>.toc{grid-column:2;grid-row:1;align-self:start;position:sticky;top:84px;margin:0;background:none;padding:4px 0 0;max-height:calc(100vh - 110px);overflow:auto;font-size:14px}
  .post-body>.toc summary{pointer-events:none;color:var(--mute);font-size:12px}
  .post-body>.toc summary::after{display:none}
  .post-body>.toc ol ol{font-size:13px}
}
@media (max-width:760px){
  .bigcard a,.seriescard{grid-template-columns:1fr}
  .bigcard img,.seriescard img{height:auto}
}
@media (max-width:560px){
  body{font-size:17px;line-height:1.85}
  h1{font-size:26px}
  .hero{padding:28px 22px 26px;border-radius:20px}
  .hero h1{font-size:30px}
  .top{padding:8px 14px}
  .brand{gap:8px;font-size:15px}
  .brand img{width:30px;height:30px}
  .topnav a{font-size:14px;padding:4px 7px}
  main{padding:18px 18px 40px}
  article h2{font-size:21px}
  article h3{font-size:18px}
  .lead{font-size:17.5px}
  .bigcard-t,.seriescard div{padding:18px 20px}
  .bigcard h3{font-size:21px}
  .pn{grid-template-columns:1fr}.pn .next{text-align:left}
  .cards,.catgrid{grid-template-columns:1fr}
  article pre{margin-left:-18px;margin-right:-18px;max-width:calc(100% + 36px);border-radius:0;padding:14px 18px}
  .cta{padding:20px 18px}
}
@media (max-width:360px){.brand span{font-size:14px}.topnav a{padding:4px 5px}}