:root{
  --bg:#F3F5F4; --paper:#fff; --ink:#182530; --ink2:#46535e; --blue:#1D4E6B; --blue2:#2b6a8f; --yellow:#F2A007;
  --line:#d5dcdf; --grid:rgba(29,78,107,.07);
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Noto Sans TC",system-ui,-apple-system,"PingFang TC","Microsoft JhengHei",sans-serif;color:var(--ink);line-height:1.8;font-size:16px;
  background-color:var(--bg);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
a:hover{color:var(--blue2)}
.mono{font-family:var(--mono);letter-spacing:.04em}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:999;background:#fff;padding:8px 12px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(24,37,48,.97);color:#fff;border-bottom:3px solid var(--yellow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.brand:hover{color:#fff}
.mark{display:inline-grid;place-items:center;font-family:var(--mono);font-weight:600;font-size:15px;letter-spacing:.06em;background:var(--blue);color:#fff;border:2px solid #fff;padding:4px 8px;line-height:1.2;box-shadow:3px 3px 0 var(--yellow)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:17px;font-weight:700;letter-spacing:.06em}
.brand-text small{font-family:var(--mono);font-size:10.5px;color:#9fb3c1;letter-spacing:.06em}
.menu{list-style:none;margin:0;padding:0;display:flex;gap:4px}
.menu a{display:block;padding:8px 12px;color:#dfe7ec;text-decoration:none;font-size:15px;font-weight:500;border-bottom:2px solid transparent}
.menu a:hover{color:#fff;border-bottom-color:rgba(242,160,7,.6)}
.menu a[aria-current]{color:#fff;border-bottom-color:var(--yellow)}
.nav-toggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:.2s}

/* buttons */
.btn{display:inline-block;padding:10px 20px;border:2px solid var(--ink);color:var(--ink);background:var(--paper);text-decoration:none;font-weight:700;font-size:15px;transition:.15s;margin:4px 6px 4px 0}
.btn:hover{background:var(--ink);color:#fff}
.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:4px 4px 0 var(--yellow)}
.btn-primary:hover{background:var(--ink);border-color:var(--ink);color:#fff}

/* hero */
.hero{padding:64px 0 56px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,rgba(255,255,255,.6),rgba(255,255,255,0))}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.eyebrow{font-size:12.5px;color:var(--blue);font-weight:600;margin:0 0 14px;text-transform:uppercase}
.hero h1{font-size:clamp(30px,4.4vw,50px);line-height:1.3;margin:0 0 18px;font-weight:900;letter-spacing:.02em}
.hero-lead{font-size:17px;color:var(--ink2);max-width:36em;margin:0 0 24px}
.hero-sheet{background:var(--paper);border:2px solid var(--ink);padding:10px;box-shadow:10px 10px 0 var(--blue)}
.sheet-grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--ink)}
.sheet-grid .cell{padding:18px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);display:flex;flex-direction:column;gap:2px}
.sheet-grid .cell:nth-child(2n){border-right:0}
.sheet-grid .cell span{font-size:11px;color:var(--ink2)}
.sheet-grid .cell b{font-size:34px;line-height:1.2;font-weight:900;color:var(--blue)}
.sheet-grid .cell small{font-size:13px;color:var(--ink2)}
.sheet-grid .cell.big{grid-column:1/-1;border-right:0;background:repeating-linear-gradient(135deg,transparent 0 10px,rgba(242,160,7,.08) 10px 20px)}
.sheet-grid .cell.big b{font-size:64px}
.sheet-grid .title-block{grid-column:1/-1;border-right:0;border-bottom:0;background:var(--ink);color:#fff}
.sheet-grid .title-block b{color:#fff;font-size:20px;font-family:var(--mono);letter-spacing:.08em}
.sheet-grid .title-block span{color:#9fb3c1}

/* sections */
section.wrap{margin-top:56px}
.sec-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:20px;border-bottom:2px solid var(--ink);padding-bottom:8px}
.sec{font-size:26px;margin:0;font-weight:900;letter-spacing:.04em}
.sec .mono{font-size:15px;background:var(--yellow);color:var(--ink);padding:2px 8px;vertical-align:middle;margin-right:4px}
.sec-row a{font-weight:700;text-decoration:none}
.sec.plain{margin-bottom:12px}

.tracks{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.track{position:relative;background:var(--paper);border:1px solid var(--line);border-top:4px solid var(--blue);padding:24px;text-decoration:none;color:var(--ink);transition:.15s}
.track:hover{transform:translateY(-3px);box-shadow:6px 6px 0 var(--yellow);color:var(--ink);border-top-color:var(--yellow)}
.track svg{display:block;width:44px;height:44px;color:var(--blue);margin-bottom:8px}
.track .mono{font-size:12px;color:var(--ink2)}
.track h3{margin:2px 0 6px;font-size:21px}
.track p{margin:0;color:var(--ink2);font-size:15px}

.shelf{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.book{background:var(--paper);border:1px solid var(--line);display:flex;flex-direction:column}
.book-cover{position:relative;display:block;aspect-ratio:1/1;background:#e8eced;padding:16px;border-bottom:1px solid var(--line)}
.book-cover img{position:absolute;inset:16px;width:calc(100% - 32px);height:calc(100% - 32px);object-fit:contain;transition:transform .25s}
.book:hover .book-cover img{transform:scale(1.03)}
.badge{position:absolute;z-index:1;top:10px;left:10px;background:var(--yellow);color:var(--ink);font-size:12px;font-weight:700;padding:2px 8px}
.book-meta{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1}
.code{font-family:var(--mono);font-size:11.5px;color:var(--blue);font-weight:600;letter-spacing:.06em}
.book h3{font-size:16px;line-height:1.45;margin:4px 0 2px}
.book h3 a{color:var(--ink);text-decoration:none}
.by{font-size:13.5px;color:var(--ink2);margin:0 0 10px}
.buy-row{margin-top:auto;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.buy{background:var(--blue);color:#fff;padding:6px 14px;font-size:14px;font-weight:700;text-decoration:none}
.buy:hover{background:var(--ink);color:#fff}
.more{font-size:14px;font-weight:700;text-decoration:none}

.band{margin-top:64px;background:var(--ink);color:#e7edf1;padding:56px 0}
.band .sec{color:#fff}
.band a:not(.btn){color:#f6c35a}
.band .btn{background:transparent;color:#fff;border-color:#fff}
.band .btn:hover{background:#fff;color:var(--ink)}
.band .btn-primary{background:var(--yellow);border-color:var(--yellow);color:var(--ink);box-shadow:none}
.band .eyebrow{color:var(--yellow)}
.split{display:grid;grid-template-columns:1.4fr .6fr;gap:48px;align-items:center}
.checks{list-style:none;padding:0;margin:0 0 20px}
.checks li{position:relative;padding-left:28px;margin:8px 0}
.checks li::before{content:"";position:absolute;left:4px;top:.55em;width:10px;height:10px;border:2px solid var(--yellow);transform:rotate(45deg)}
.line-card{background:#fff;color:var(--ink);padding:18px;text-align:center;border:2px solid var(--yellow)}
.line-card img{margin:0 auto;max-width:200px}
.line-card p{margin:8px 0 0;font-size:14px}
.quote-row{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}
blockquote{margin:0;background:var(--paper);border-left:4px solid var(--yellow);padding:20px 24px}
blockquote p{margin:0 0 6px;font-size:17px;font-weight:500}
cite{font-style:normal;color:var(--ink2);font-size:14px}

/* page head */
.page-head{background:var(--ink);color:#fff;padding:36px 0 40px;border-bottom:3px solid var(--yellow)}
.tb{display:flex;justify-content:space-between;font-size:11.5px;color:#9fb3c1;border-bottom:1px dashed rgba(255,255,255,.25);padding-bottom:8px;margin-bottom:14px}
.page-head h1{margin:0;font-size:clamp(28px,4vw,40px);font-weight:900;letter-spacing:.04em}
.page-head .lead{margin:10px 0 0;color:#cdd8df;max-width:46em}
.subnav{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:71px;z-index:20}
.subnav .wrap{display:flex;gap:6px;overflow-x:auto;padding-top:8px;padding-bottom:8px}
.subnav a{white-space:nowrap;padding:6px 12px;text-decoration:none;font-weight:600;font-size:14.5px;border:1px solid var(--line);color:var(--ink)}
.subnav a:hover{border-color:var(--blue);color:var(--blue)}

/* prose */
.prose{max-width:860px;padding-top:36px;padding-bottom:20px;overflow-wrap:anywhere}
.prose h2{font-size:24px;margin:40px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--ink)}
.prose h4{font-size:17px;margin:26px 0 8px;color:var(--blue)}
.prose ol,.prose ul:not(.chips):not(.checks){padding-left:1.4em}
.note{background:#fff8e6;border-left:4px solid var(--yellow);padding:10px 14px;font-size:15px}
.chips{list-style:none;padding:0;margin:10px 0;display:flex;flex-wrap:wrap;gap:8px}
.chips li{background:var(--paper);border:1px solid var(--line);padding:3px 12px;font-size:14.5px}
.link-row{margin:16px 0}
.facts,.routes,.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0}
.fact,.route,.c-card{background:var(--paper);border:1px solid var(--line);border-top:4px solid var(--blue);padding:20px}
.route{border-top-color:var(--yellow)}
.fact .mono,.route .mono,.c-card .mono{font-size:12px;color:var(--ink2)}
.fact h3,.route h3,.c-card h3{margin:2px 0 6px;font-size:19px}
.fact p,.route p,.c-card p{margin:0 0 8px;color:var(--ink2);font-size:15px}
.fact a,.route a{font-weight:700;text-decoration:none;font-size:14.5px}
.c-card{display:flex;flex-direction:column;gap:6px}
.c-card .btn{align-self:flex-start;word-break:break-all}
.c-card:nth-child(2){flex-direction:row;align-items:center;gap:16px}
.c-card .zoom{flex:none;width:120px}

/* gallery / zoom */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin:14px 0}
.gallery.two{grid-template-columns:1fr 1fr}
.gallery .g-item{display:block;background:#fff;border:1px solid var(--line);padding:6px}
.gallery .g-item img{width:100%;height:auto}
a.zoom{cursor:zoom-in}

/* books page */
.book-detail{padding:44px 0;border-bottom:1px solid var(--line);scroll-margin-top:120px}
.book-detail:nth-of-type(even){background:rgba(255,255,255,.55)}
.bd-grid{display:grid;grid-template-columns:300px 1fr;gap:44px;align-items:start}
.bd-cover{position:sticky;top:130px;background:var(--paper);border:1px solid var(--line);padding:18px;box-shadow:8px 8px 0 var(--blue)}
.bd-body.prose{padding:0;max-width:none}
.bd-body h2{border:0;margin:4px 0 0;padding:0;font-size:28px}
.bd-body .sub{margin:2px 0 4px;color:var(--ink2);font-weight:500}
.tagline{font-weight:700;color:var(--blue)}

/* papers */
.papers{scroll-margin-top:120px}
.paper-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.paper{background:var(--paper);border:1px solid var(--ink)}
.paper h3{margin:0;padding:10px 16px;background:var(--ink);color:#fff;font-size:17px;display:flex;justify-content:space-between}
.paper table{width:100%;border-collapse:collapse}
.paper th,.paper td{border-top:1px solid var(--line);padding:8px 12px;text-align:left;font-size:15px}
.paper thead th{font-size:12.5px;color:var(--ink2);font-weight:600;background:#f7f9f9}
.paper tbody th{font-family:var(--mono);font-weight:600;width:88px;color:var(--blue)}
.dl{display:inline-flex;align-items:baseline;gap:8px;font-weight:700;text-decoration:none}
.dl::before{content:"↓";font-family:var(--mono);color:var(--yellow);font-weight:700}
.dl small{font-weight:400;color:var(--ink2);font-size:12px}

/* team */
.about3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.about3>div{background:var(--paper);border:1px solid var(--line);border-top:4px solid var(--yellow);padding:20px}
.about3 .mono{font-size:12px;color:var(--blue);font-weight:600}
.about3 h3{margin:2px 0 6px}
.about3 p{margin:0;color:var(--ink2);font-size:15px}
.person{display:grid;grid-template-columns:240px 1fr;gap:32px;background:var(--paper);border:1px solid var(--line);padding:24px;margin-bottom:24px}
.person .ph img{width:100%;aspect-ratio:4/5;object-fit:cover;filter:grayscale(1);border:1px solid var(--line)}
.person .mono{font-size:12px;color:var(--blue);font-weight:600}
.person h3{margin:0 0 6px;font-size:26px}
.person .cols{display:grid;grid-template-columns:1fr 1.2fr;gap:24px}
.person .cols+.cols{margin-top:6px}
.person h4{margin:10px 0 6px;font-size:15px;color:var(--blue);border-bottom:1px solid var(--line);padding-bottom:4px}
.person ul{margin:0;padding-left:1.1em;font-size:14.5px;line-height:1.7}

/* file card */
.file-card{display:flex;align-items:center;gap:14px;padding:12px 16px;margin:10px 0;background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);text-decoration:none;color:var(--ink)}
.file-card:hover{border-left-color:var(--yellow);color:var(--ink)}
.f-ext{flex:none;font-family:var(--mono);font-size:12px;font-weight:600;color:#fff;background:var(--blue);padding:5px 8px;min-width:46px;text-align:center}
.f-name{flex:1;font-weight:700}
.f-size{color:var(--ink2);font-size:13px}

/* footer */
.site-footer{margin-top:72px;background:var(--ink);color:#b9c7d1;font-size:14.5px;border-top:3px solid var(--yellow)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px;padding-top:40px;padding-bottom:28px}
.site-footer h4{color:#fff;margin:0 0 8px;font-size:15px}
.site-footer a{color:#e6edf2;text-decoration:none}
.site-footer a:hover{color:var(--yellow)}
.f-brand{color:#fff;font-weight:700;font-size:16px;margin:0 0 8px}
.f-brand .mark{font-size:12px;box-shadow:2px 2px 0 var(--yellow)}
.copy{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;padding-bottom:20px;font-size:12.5px;color:#8ea2b0}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(10,16,22,.94);display:flex;align-items:center;justify-content:center}
.lightbox[hidden]{display:none}
.lightbox img{max-width:92vw;max-height:88vh;width:auto;background:#fff}
.lightbox button{position:absolute;background:none;border:0;color:#fff;font-size:44px;cursor:pointer;padding:10px 16px}
.lb-close{top:10px;right:14px}.lb-prev{left:6px}.lb-next{right:6px}

/* responsive */
@media (max-width:980px){
  .shelf{grid-template-columns:repeat(3,1fr)}
  .tracks{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .bd-grid{grid-template-columns:220px 1fr;gap:28px}
  .person{grid-template-columns:180px 1fr}
  .person .cols{grid-template-columns:1fr;gap:0}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:71px;left:0;right:0;background:var(--ink);border-bottom:3px solid var(--yellow)}
  body.nav-open .site-nav{display:block}
  .menu{flex-direction:column;padding:8px 20px 16px}
  .menu a{padding:12px 4px;border-bottom:1px solid rgba(255,255,255,.1)}
  .menu a[aria-current]{border-bottom-color:var(--yellow);color:var(--yellow)}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .tracks,.about3{grid-template-columns:1fr}
  .split,.quote-row,.paper-grid,.facts,.routes,.contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:20px}
  .bd-grid{grid-template-columns:1fr}
  .bd-cover{position:static;max-width:260px}
  .person{grid-template-columns:1fr}
  .person .ph{max-width:220px}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .shelf{grid-template-columns:repeat(2,1fr)}
  .shelf{gap:14px}
  .book-cover img{inset:10px;width:calc(100% - 20px);height:calc(100% - 20px)}
  .book h3{font-size:15px}
  .brand-text small{display:none}
  .hero{padding:40px 0}
  .sheet-grid .cell{padding:12px}
  .sheet-grid .cell.big b{font-size:48px}
  .sheet-grid .cell b{font-size:26px}
  .hero-sheet{box-shadow:6px 6px 0 var(--blue)}
  .gallery.two{grid-template-columns:1fr}
  .c-card:nth-child(2){flex-direction:column;align-items:flex-start}
  .paper th,.paper td{padding:8px}
}

.paper .new{font-style:normal;font-family:var(--mono);font-size:10px;background:var(--yellow);color:var(--ink);padding:1px 5px;margin-left:4px;vertical-align:middle}
.paper tbody th{white-space:nowrap}