:root{
  --bg:#f6f7f9;--card:#fff;--ink:#14181f;--mut:#5b6472;--line:#e3e6eb;
  --acc:#1f6feb;--acc-ink:#fff;--acc-soft:#e8f0fe;
  --ok:#1a7f37;--ok-soft:#e6f4ea;--err:#c62828;--err-soft:#fdecea;--warn:#9a6700;--warn-soft:#fff5d6;
  --buy:#fff;--buy-ink:#1f6feb;--buy-line:#8fb4f3;--buy-hover:#f0f5fe;
  --r:10px;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0f1216;--card:#171b21;--ink:#e8ebf0;--mut:#9aa3b0;--line:#2a3039;
  --acc:#4c8dff;--acc-ink:#0b1020;--acc-soft:#1a2740;
  --buy:transparent;--buy-ink:#6ea2ff;--buy-line:#35507f;--buy-hover:#1a2740;
  --ok:#4ac26b;--ok-soft:#12291a;--err:#ff6b6b;--err-soft:#35191a;--warn:#e3b341;--warn-soft:#2e2612;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--acc)}
h1,h2,h3{line-height:1.2}
button{font:inherit;color:inherit;cursor:pointer}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}

/* header / footer */
.top{background:var(--card);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:20px;height:56px}
.logo{font-weight:800;color:var(--ink);text-decoration:none;font-size:18px;white-space:nowrap}
.logo b{color:var(--acc)}
.nav{display:flex;gap:18px;margin-left:auto;font-size:15px}
.nav a{color:var(--mut);text-decoration:none;white-space:nowrap}
@media (max-width:400px){.top .wrap{gap:8px}.nav{gap:9px!important;font-size:13px!important}.logo{font-size:14px!important}}
@media (max-width:360px){.top .wrap{padding:0 10px}.nav{font-size:12px!important;gap:7px!important}.logo{font-size:13px!important}}
.nav a:hover,.nav a[aria-current]{color:var(--ink)}
@media (max-width:560px){.nav{gap:12px;font-size:14px}.logo{font-size:16px}.nav .hide-sm{display:none}}
.foot{margin-top:48px;border-top:1px solid var(--line);color:var(--mut);font-size:14px;padding:24px 0 40px}
.foot p{margin:4px 0}.foot a{color:var(--mut)}

/* buttons */
.btn{display:inline-block;border:1px solid var(--line);background:var(--card);border-radius:8px;padding:10px 16px;font-weight:600;text-decoration:none;color:var(--ink)}
.btn.pri{background:var(--acc);border-color:var(--acc);color:var(--acc-ink)}
.btn:disabled{opacity:.45;cursor:default}
.btn.buyall{background:var(--acc);border-color:var(--acc);color:var(--acc-ink)}
.btn.buyall:hover{filter:brightness(1.08)}
.btn.soft{background:var(--acc-soft);border-color:var(--acc-soft);color:var(--acc);display:inline-flex;align-items:center;gap:6px}
.btn.soft:hover{border-color:var(--acc)}
.ico{width:15px;height:15px;flex-shrink:0}
.cta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:16px 0}
.cartnote{flex-basis:100%;margin:0;font-size:13px;color:var(--mut)}
.cartbtn{display:block;text-align:center;margin-top:12px}
.cartnote:empty{display:none}
.buy{display:inline-block;background:var(--buy);color:var(--buy-ink);border:1px solid var(--buy-line);font-weight:600;font-size:14px;border-radius:6px;padding:6px 12px;text-decoration:none;white-space:nowrap}
.buy:hover{background:var(--buy-hover)}
.linkbtn{background:none;border:0;color:var(--mut);text-decoration:underline;padding:0;font-size:14px;margin-top:12px}

/* home */
.hero{padding:48px 0 32px}
.hero h1{font-size:clamp(30px,6vw,48px);margin:0 0 12px;letter-spacing:-.02em}
.hero p{font-size:18px;color:var(--mut);max-width:620px;margin:0 0 24px}
.hero .btn{font-size:17px;padding:13px 22px}
.cards{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;flex-direction:column}
.card h3{margin:0 0 4px;font-size:19px}
.card .tag{color:var(--mut);font-size:14px;margin:0 0 12px}
.card .price{font-size:26px;font-weight:800;margin:0 0 8px}
.card ul{margin:0 0 16px;padding-left:18px;color:var(--mut);font-size:14px;flex:1}
.card .row{display:flex;gap:8px;flex-wrap:wrap}
.steps{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));counter-reset:s}
.steps div{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px}
.steps h3{margin:0 0 6px;font-size:17px}
.steps p{margin:0;color:var(--mut);font-size:15px}
section.blk{margin-top:40px}
section.blk>h2{font-size:24px;margin:0 0 16px}
.h-link{color:inherit;text-decoration:none}
.h-link:hover{color:var(--acc);text-decoration:underline}

/* article pages */
.article{max-width:760px}
.article h1{font-size:clamp(28px,5vw,40px);margin:32px 0 8px}
.article .lede{font-size:18px;color:var(--mut);margin:0 0 24px}
.article h2{margin:32px 0 8px;font-size:22px}
.article p,.article li{color:var(--ink)}
.note{background:var(--acc-soft);border-radius:var(--r);padding:14px 16px;font-size:15px}
.ptable{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-size:15px;margin:16px 0}
.ptable th,.ptable td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.ptable th{color:var(--mut);font-weight:600;white-space:nowrap}
.ptable .num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.ptable .tot th,.ptable .tot td{font-weight:800;color:var(--ink);border-bottom:0}
@media (max-width:560px){
  .ptable,.ptable tbody,.ptable tr{display:block}
  .ptable tr{display:grid;grid-template-columns:1fr auto auto;gap:2px 10px;padding:10px 12px;border-bottom:1px solid var(--line);align-items:center}
  .ptable th,.ptable td{padding:0;border:0}
  .ptable th{grid-column:1/-1;font-size:13px}
  .ptable .tot{grid-template-columns:1fr auto}
  .ptable .tot td:empty{display:none}
}

/* builder */
.b-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:24px 0 8px}
.b-head h1{margin:0;font-size:28px}
.b-head p{margin:0;color:var(--mut);font-size:14px}
.b-grid{display:grid;gap:20px;grid-template-columns:1fr;align-items:start}
@media (min-width:900px){.b-grid{grid-template-columns:1fr 340px}#summary{position:sticky;top:16px}}
.grp-wrap+.grp-wrap{margin-top:12px}
.grp{display:flex;align-items:center;gap:10px;width:100%;background:none;border:0;border-bottom:1px solid var(--line);padding:8px 2px;margin-bottom:8px;text-align:left}
.grp-name{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--mut)}
.grp-meta{margin-left:auto;font-size:13px;color:var(--mut);font-variant-numeric:tabular-nums}
.pm{width:22px;height:22px;display:grid;place-items:center;border:1px solid var(--line);border-radius:6px;font-size:16px;line-height:1;color:var(--mut)}
.grp:hover .pm{color:var(--ink);border-color:var(--mut)}
.grp[aria-expanded=false]{margin-bottom:0}
.cat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px;margin-bottom:8px}
.cat-h{display:flex;align-items:center;justify-content:space-between}
.cat h3{font-size:15px;margin:0;display:flex;align-items:center;gap:8px}
.req{font-size:12px;color:var(--mut)}
.hint{font-size:13px;color:var(--mut);margin:4px 0 0}
.flag{display:inline-grid;place-items:center;width:18px;height:18px;border-radius:50%;font-size:12px;font-weight:800;color:#fff}
.flag.err{background:var(--err)}.flag.warn{background:var(--warn)}
.item{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:10px 0;border-top:1px solid var(--line);margin-top:10px}
.item+.item{margin-top:0}
.it-main{min-width:0}
.nm{font-weight:600;font-size:15px}
.sp{color:var(--mut);font-size:13px}
.it-side{display:flex;align-items:center;gap:10px;flex-shrink:0}
.pr{font-weight:700;font-variant-numeric:tabular-nums}
.x{background:none;border:0;font-size:22px;line-height:1;color:var(--mut);padding:4px 6px}
.qty{display:flex;align-items:center;border:1px solid var(--line);border-radius:6px}
.qty button{background:none;border:0;width:28px;height:28px;font-size:16px}
.qty span{min-width:18px;text-align:center;font-size:14px}
.add,.swap{margin-top:10px;width:100%;background:var(--acc-soft);color:var(--acc);border:1px dashed var(--acc);border-radius:8px;padding:10px;font-weight:600}
.swap{width:auto;background:none;border:0;padding:0;margin-top:2px;font-size:14px;text-decoration:underline}
@media (max-width:560px){
  .item{flex-direction:column;align-items:stretch;gap:8px}
  .it-side{justify-content:flex-end}
  .it-side .pr{margin-right:auto}
}
#summary{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.tot-row{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.lbl{font-size:13px;color:var(--mut)}
.big{font-size:30px;font-weight:800;font-variant-numeric:tabular-nums;line-height:1.1}
.sub{font-size:13px;color:var(--mut);margin-top:4px}
.st{display:block;margin:12px 0 4px;font-weight:600;font-size:15px}
.st .tap{display:none}
@media (max-width:899px){.st .tap{display:inline}}
.st.ok{color:var(--ok)}.st.err{color:var(--err)}
.issues{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:6px}
.issues li{font-size:14px;padding:8px 10px;border-radius:6px}
.issues .err{background:var(--err-soft);color:var(--err)}
.issues .warn{background:var(--warn-soft);color:var(--warn)}
.disclose{font-size:13px;color:var(--mut);margin-top:16px}
@media (max-width:899px){
  /* keep total + share reachable on phones */
  #summary{position:sticky;bottom:0;z-index:5;margin:0 -16px;border-radius:14px 14px 0 0;border-bottom:0;box-shadow:0 -6px 20px rgba(0,0,0,.12);max-height:70vh;overflow-y:auto}
  .big{font-size:24px}
  #summary .more{display:none}
  #summary.open .more{display:block}
  #summary .st{margin:8px 0 0;cursor:pointer;font-size:14px}
  #summary .st .tap{font-weight:400;color:var(--mut)}
}

/* picker dialog */
dialog#picker{border:0;padding:0;border-radius:14px;width:min(720px,calc(100% - 32px));max-height:min(86vh,900px);background:var(--card);color:var(--ink);display:none;flex-direction:column}
dialog#picker[open]{display:flex}
dialog::backdrop{background:rgba(0,0,0,.5)}
.p-top{padding:14px 16px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.p-f select{max-width:45%}
.p-row{display:flex;justify-content:space-between;align-items:center;gap:8px}
.p-row h2{margin:0;font-size:18px}
#p-close{background:none;border:0;font-size:28px;line-height:1;padding:0 4px;color:var(--mut)}
.p-f{display:flex;gap:8px}
.p-f input,.p-f select{font:inherit;font-size:16px;padding:9px 10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
.p-f input{flex:1;min-width:0}
#p-list{list-style:none;margin:0;padding:6px;overflow-y:auto;overscroll-behavior:contain}
.opt button{width:100%;display:flex;gap:12px;justify-content:space-between;align-items:center;text-align:left;background:none;border:0;border-radius:8px;padding:11px 10px}
.opt button:hover{background:var(--bg)}
.opt.sel button{background:var(--acc-soft)}
.o-main{display:flex;flex-direction:column;min-width:0}
.o-main .nm{font-size:15px}
.o-side{display:flex;flex-direction:column;align-items:flex-end;gap:4px;flex-shrink:0}
.addt{font-size:13px;font-weight:700;color:var(--acc)}
.opt.bad .nm,.opt.bad .pr{opacity:.55}
.retired{font-size:13px;font-weight:600;color:var(--warn);margin-top:2px}
.swapto{background:none;border:0;padding:0;color:var(--acc);font:inherit;font-weight:600;text-decoration:underline}
.why{color:var(--err);font-size:13px;margin-top:2px}
.empty{padding:24px;text-align:center;color:var(--mut)}
@media (max-width:560px){
  dialog#picker{width:100%;max-width:100%;height:100%;max-height:100%;border-radius:0;margin:0}
}
#toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,40px);opacity:0;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:8px;font-size:14px;transition:.2s;pointer-events:none;z-index:50;max-width:calc(100% - 32px)}
#toast.on{opacity:1;transform:translate(-50%,0)}