/* FUN/D design system v0.1 */
:root{
  --paper:#FFFFFF;--surface:#FFFFFF;--mist:#E4E9FA;--ice:#E3EEFF;--slate:#599CFC;--ink:#15265D;--accent:#2B4BCF;
  --ink-2:#000000;--text:#000000;--muted:#3A4661;--line:#D6DEF3;--wash-a:var(--ice);--wash-b:var(--mist);
  --rail-bg:#15265D;--rail-fg:#FFFFFF;--rail-hi:#599CFC;--focus:#2B4BCF;
  --r-sm:6px;--r:10px;--r-lg:18px;--rail:64px;--rail-open:288px;
  --fd:"Instrument Sans",system-ui,sans-serif;--fb:"IBM Plex Sans",system-ui,sans-serif;
}
[data-theme="dark"]{
  --paper:#000000;--surface:#0B1533;--mist:#15265D;--ice:#122152;--slate:#599CFC;--ink:#FFFFFF;--accent:#599CFC;--ink-2:#FFFFFF;
  --text:#F2F5FF;--muted:#A9BEE8;--line:#25376E;--wash-a:#0F1E4A;--wash-b:#0A1636;
  --rail-bg:#000000;--rail-fg:#FFFFFF;--rail-hi:#599CFC;--focus:#599CFC;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--paper);color:var(--text);font:16px/1.6 var(--fb);-webkit-font-smoothing:antialiased;padding-left:var(--rail)}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--fd);color:var(--ink);line-height:1.08;margin:0 0 .5em;letter-spacing:-.015em}
h1{font-size:clamp(2.4rem,5.2vw,4.4rem);font-weight:700}h2{font-size:clamp(1.7rem,3vw,2.5rem);font-weight:700}
h3{font-size:1.25rem;font-weight:600}h4{font-size:1.05rem;font-weight:600}
p{margin:0 0 1em;max-width:68ch}.lede{font-size:1.2rem;color:var(--muted);max-width:60ch}
.wrap{max-width:1120px;margin:0 auto;padding:0 clamp(20px,4vw,48px)}
.btn{display:inline-flex;align-items:center;gap:.5rem;font:600 .95rem var(--fd);padding:.8rem 1.25rem;border-radius:var(--r-sm);border:1.5px solid var(--accent);background:var(--accent);color:#fff;text-decoration:none;cursor:pointer}
[data-theme="dark"] .btn{color:#000}
.btn.ghost{background:transparent;color:var(--accent)}.btn:hover{filter:brightness(1.1)}
.btn.small{padding:.5rem .85rem;font-size:.85rem;white-space:nowrap}

/* ---------- top bar (mobile + utility) ---------- */
.top{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px clamp(20px,4vw,48px);background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .crumbs{font-size:.85rem;color:var(--muted)}.top .crumbs a{color:var(--muted)}
.top .tools{display:flex;gap:10px;align-items:center}
.iconbtn{width:38px;height:38px;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--surface);color:var(--ink);display:inline-grid;place-items:center;cursor:pointer}
.burger{display:none}

/* ---------- logo ---------- */
.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.logo .mark{width:34px;height:34px;flex:0 0 34px}
.logo .word{font:700 1.3rem/1 var(--fd);letter-spacing:-.02em;color:var(--ink)}
.logo .word i{font-style:normal;color:var(--slate);font-weight:800;margin:0 1px}
.rail .logo .word{color:#fff}.rail .logo .word i{color:var(--rail-hi)}

/* ---------- rail (Supabase-style) ---------- */
.rail{position:fixed;inset:0 auto 0 0;width:var(--rail);background:var(--rail-bg);color:var(--rail-fg);z-index:50;display:flex;flex-direction:column;overflow:hidden;transition:width .16s ease;border-right:1px solid rgba(255,255,255,.06)}
.rail:hover,.rail.pinned,.rail.open{width:var(--rail-open)}
.rail .head{height:64px;display:flex;align-items:center;padding:0 15px;gap:10px;border-bottom:1px solid rgba(255,255,255,.12);flex:0 0 auto}
.rail .lbl{opacity:0;white-space:nowrap;transition:opacity .12s;font:500 .92rem var(--fd)}
.rail:hover .lbl,.rail.pinned .lbl,.rail.open .lbl{opacity:1}
.rail nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:8px 0;scrollbar-width:thin}
.rail .grp{margin:6px 0}
.rail .grp>.it{font-weight:600}
.rail .it{display:flex;align-items:center;gap:14px;padding:9px 20px;color:var(--rail-fg);text-decoration:none;white-space:nowrap;border-left:3px solid transparent}
.rail .it svg{width:22px;height:22px;flex:0 0 22px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.rail .it:hover{background:rgba(255,255,255,.07)}
.rail .it.cur{border-left-color:var(--rail-hi);background:rgba(255,255,255,.1)}
.rail .sub{display:none;padding:2px 0 6px}
.rail:hover .sub,.rail.pinned .sub,.rail.open .sub{display:block}
.rail .sub .it{padding:6px 16px 6px 58px;font-size:.86rem;opacity:.85}
.rail .sub .it.cur{opacity:1}
.rail .foot{border-top:1px solid rgba(255,255,255,.08);padding:8px 0}
.rail .foot button{all:unset;cursor:pointer;display:flex;align-items:center;gap:14px;padding:9px 20px;width:100%;box-sizing:border-box;color:var(--rail-fg)}
.rail .foot button svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round}
.rail .foot button:hover{background:rgba(255,255,255,.07)}
body.pinned{padding-left:var(--rail-open)}
.scrim{display:none;position:fixed;inset:0;background:rgba(15,25,32,.45);z-index:45}
@media(max-width:900px){
  body,body.pinned{padding-left:0}
  .rail{width:0;border:0}.rail.open{width:min(84vw,320px)}
  .rail:hover:not(.open){width:0}.rail:hover:not(.open) .lbl{opacity:0}.rail:hover:not(.open) .sub{display:none}
  .burger{display:inline-grid}.scrim.on{display:block}
  .rail .foot .pin{display:none}
  .top .crumbs{display:none}
  .hero .slash{background:linear-gradient(115deg,transparent 0 68%,color-mix(in srgb,var(--ice) 62%,transparent) 68.2% 100%)}.hero .slash::after{background:linear-gradient(115deg,transparent 0 67.3%,color-mix(in srgb,var(--slate) 70%,transparent) 67.5% 68.1%,transparent 68.3%)}
}

/* ---------- fades ---------- */
.sec{position:relative;padding:clamp(56px,8vw,104px) 0;overflow:hidden}
.sec.tight{padding:clamp(36px,5vw,64px) 0}
.fade-l::before,.fade-r::before,.fade-t::before,.fade-b::before,.fade-x::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none}
.fade-l::before{background:linear-gradient(90deg,color-mix(in srgb,var(--wash-a) 62%,transparent) 0%,color-mix(in srgb,var(--wash-a) 30%,transparent) 34%,transparent 64%)}
.fade-r::before{background:linear-gradient(270deg,color-mix(in srgb,var(--wash-b) 62%,transparent) 0%,color-mix(in srgb,var(--wash-b) 30%,transparent) 34%,transparent 64%)}
.fade-t::before{background:linear-gradient(180deg,color-mix(in srgb,var(--wash-a) 60%,transparent) 0%,transparent 50%)}
.fade-b::before{background:linear-gradient(0deg,color-mix(in srgb,var(--wash-b) 60%,transparent) 0%,transparent 50%)}
.fade-x::before{background:linear-gradient(90deg,color-mix(in srgb,var(--wash-a) 60%,transparent),transparent 28%,transparent 72%,color-mix(in srgb,var(--wash-b) 60%,transparent))}
.sec>.wrap{position:relative;z-index:1}

/* ---------- hero with slash ---------- */
.hero{padding:clamp(64px,9vw,130px) 0 clamp(56px,7vw,96px);position:relative;overflow:hidden}
.hero .slash{position:absolute;inset:0;z-index:0;pointer-events:none;background:linear-gradient(115deg,transparent 0 54%,color-mix(in srgb,var(--ice) 62%,transparent) 54.2% 100%)}
.hero .slash::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 0 53.3%,color-mix(in srgb,var(--slate) 70%,transparent) 53.5% 54.1%,transparent 54.3%)}
.hero .wrap{position:relative;z-index:1}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:1.6rem}
.hero .kicker{font:600 .95rem var(--fd);color:var(--muted);margin-bottom:.9rem}

/* ---------- blocks ---------- */
.grid{display:grid;gap:22px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px 22px 18px;box-shadow:var(--elev-1)}
.card h3{margin-top:.2rem}.card p{margin-bottom:.4rem;color:var(--muted);font-size:.97rem}
.feat{border-top:2px solid var(--slate);padding-top:16px}
.feat h3{font-size:1.1rem}
.stat{font:700 clamp(2rem,4vw,3rem)/1 var(--fd);color:var(--ink);letter-spacing:-.03em}
.stat+small{display:block;color:var(--muted);margin-top:6px}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
@media(max-width:900px){.split{grid-template-columns:1fr}}
.ledger{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--surface);box-shadow:var(--elev-1)}
.ledger table{width:100%;border-collapse:collapse;font-size:.95rem}
.ledger th,.ledger td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.ledger th{background:var(--mist);font-family:var(--fd);font-weight:600;color:var(--ink)}
[data-theme="dark"] .ledger th{background:var(--ice)}
.ledger tr:last-child td{border-bottom:0}
.check{color:var(--ink);font-weight:700}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq summary{cursor:pointer;font:600 1.05rem var(--fd);color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::after{content:"+";color:var(--slate);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq p{margin:.6rem 0 0;color:var(--muted)}
.list{padding-left:1.1rem}.list li{margin:.35rem 0}
.sib{font-size:.9rem;color:var(--muted);border-left:3px solid var(--slate);padding:6px 14px;margin:1.5rem 0}
.mock{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;box-shadow:0 20px 60px -30px rgba(43,75,207,.35)}
.mock .bar{height:10px;border-radius:5px;background:var(--mist);margin:8px 0}
.mock .row{display:grid;grid-template-columns:1fr 60px 60px;gap:10px;align-items:center;padding:7px 0;border-bottom:1px solid var(--line);font-size:.85rem}
.mock .row:last-child{border:0}.mock .row b{color:var(--ink)}
.mock .chip{display:inline-block;padding:2px 8px;border-radius:99px;background:var(--ice);color:var(--ink);font:600 .72rem var(--fd)}

/* ---------- contact form ---------- */
.form{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:28px;max-width:520px}
.form label{display:block;font:600 .88rem var(--fd);color:var(--ink);margin:12px 0 6px}
.form input{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--r-sm);background:var(--paper);color:var(--text);font:1rem var(--fb)}
.form input:focus{border-color:var(--accent);outline:none}
.form .err{display:none;color:#9b3b2e;font-size:.88rem;margin-top:6px}[data-theme="dark"] .form .err{color:#f0a08c}
.form .err.on{display:block}
.form .btn{margin-top:18px;width:100%;justify-content:center}
.form .fine{font-size:.8rem;color:var(--muted);margin:12px 0 0}
.form .done{display:none;text-align:left}.form.sent form{display:none}.form.sent .done{display:block}
.sink{position:absolute;width:0;height:0;border:0;opacity:0}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:48px 0 32px;margin-top:32px;font-size:.9rem;color:var(--muted)}
footer .cols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px}
@media(max-width:900px){footer .cols{grid-template-columns:repeat(2,1fr)}}
footer h4{font-size:.9rem;margin-bottom:.6rem}footer ul{list-style:none;margin:0;padding:0}footer li{margin:.3rem 0}footer a{color:var(--muted);text-decoration:none}footer a:hover{color:var(--ink)}
footer .base{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:32px;padding-top:18px;border-top:1px solid var(--line);font-size:.82rem}

/* ---------- 404 ---------- */
.lost{min-height:70vh;display:grid;place-items:center;text-align:center}
.lost h1{font-size:clamp(4rem,14vw,11rem);line-height:.9;letter-spacing:-.05em}
.lost h1 i{font-style:normal;color:var(--slate)}
.lost p{margin-left:auto;margin-right:auto}
.rail .head .word{opacity:0;transition:opacity .12s}
.rail:hover .head .word,.rail.pinned .head .word,.rail.open .head .word{opacity:1}

.answer{border-left:4px solid var(--slate);background:var(--surface);border-radius:0 var(--r) var(--r) 0;padding:20px 24px;max-width:78ch}
.answer h2{font-size:1.25rem;margin-bottom:.4rem}.answer p{margin:0;max-width:none}

/* ---------- lockup / brand ---------- */
.lockup{display:block;height:auto}
.rail .head .lockup{height:34px;width:auto}
.rail .head .lockup text{opacity:0;transition:opacity .12s}
.rail:hover .head .lockup text,.rail.pinned .head .lockup text,.rail.open .head .lockup text{opacity:1}
.brand{padding-top:0!important}
.brandband{display:flex;align-items:center;gap:28px;padding:22px 28px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface)}
.brandband p{margin:0;color:var(--muted);max-width:52ch}
@media(max-width:700px){.brandband{flex-direction:column;align-items:flex-start;gap:14px}}
/* ---------- reviews ---------- */
.rbadge{display:inline-flex;align-items:center;gap:6px;padding:0 10px;height:38px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);text-decoration:none;color:var(--ink);font:600 .85rem var(--fd);white-space:nowrap}
.rbadge .stars{color:#F5B301;letter-spacing:-1px;font-size:.9rem}.rbadge small{color:var(--muted);font-weight:500}
.rbadge.muted{color:var(--muted)}
@media(max-width:600px){.rbadge small{display:none}}
.rsum{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.rsum .stat{font-size:2.6rem}.stars.big{color:#F5B301;font-size:1.6rem;letter-spacing:-1px}.rsum small{color:var(--muted);max-width:60ch}
.card.review .stars{color:#F5B301;letter-spacing:-1px;margin-bottom:6px}.card.review small{display:block;margin-top:10px;color:var(--muted)}
.form .chk{display:flex;gap:10px;align-items:flex-start;font:500 .85rem var(--fb);color:var(--muted);margin:14px 0 0}.form .chk input{width:auto;margin-top:3px}
.starrow{display:flex;gap:14px;flex-wrap:wrap;margin:6px 0 4px}.starpick{font:600 .95rem var(--fd);color:var(--ink);display:flex;gap:6px;align-items:center;margin:0}.starpick input{width:auto}

/* ---------- Advisor ---------- */
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.adv-launch{position:fixed;right:22px;bottom:calc(22px + env(safe-area-inset-bottom,0px));z-index:60;display:flex;align-items:center;gap:10px;padding:8px 18px 8px 8px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:600 .95rem var(--fd);cursor:pointer;box-shadow:0 14px 40px -18px rgba(21,38,93,.55)}
.adv-launch svg{width:34px;height:34px;border-radius:8px}
.adv-launch:hover{border-color:var(--accent)}
body.adv-on .adv-launch{display:none}
.adv-panel{position:fixed;right:22px;bottom:calc(22px + env(safe-area-inset-bottom,0px));z-index:61;width:min(420px,calc(100vw - 32px));height:min(640px,calc(100vh - 110px));display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 30px 80px -30px rgba(21,38,93,.6);overflow:hidden}
.adv-panel[hidden]{display:none}
.adv-head{display:flex;align-items:center;gap:10px;padding:12px 12px 12px 14px;background:#15265D;color:#fff}
[data-theme="dark"] .adv-head{background:#0B1533;border-bottom:1px solid var(--line)}
.adv-head>svg{width:32px;height:32px;flex:0 0 32px}
.adv-head div{flex:1;min-width:0}.adv-head b{display:block;font:700 1.02rem var(--fd)}
.adv-head small{display:block;font-size:.76rem;opacity:.78;line-height:1.3}
.adv-person{all:unset;cursor:pointer;font:600 .78rem var(--fd);padding:6px 10px;border:1px solid rgba(255,255,255,.35);border-radius:999px;white-space:nowrap}
.adv-person:hover{background:rgba(255,255,255,.1)}
.adv-x{all:unset;cursor:pointer;width:30px;height:30px;display:grid;place-items:center;font-size:1.5rem;line-height:1;border-radius:8px}
.adv-x:hover{background:rgba(255,255,255,.12)}
.adv-person:focus-visible,.adv-x:focus-visible{outline:2px solid #599CFC;outline-offset:2px}
.adv-log{flex:1;overflow-y:auto;padding:16px 14px 8px;display:flex;flex-direction:column;gap:10px;background:var(--paper)}
.adv-msg{max-width:88%;padding:10px 13px;border-radius:14px;font-size:.93rem;line-height:1.5}
.adv-msg p{margin:0 0 .5em;max-width:none}.adv-msg p:last-child{margin:0}
.adv-msg ul{margin:.2em 0 .5em;padding-left:1.1rem}.adv-msg li{margin:.2em 0}
.adv-msg.bot{align-self:flex-start;background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:4px;color:var(--text)}
.adv-msg.me{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}
[data-theme="dark"] .adv-msg.me{color:#000}
.adv-msg a{color:var(--accent);font-weight:600}
.adv-src{display:flex;flex-wrap:wrap;gap:6px;margin-top:9px;padding-top:8px;border-top:1px solid var(--line)}
.adv-src span{width:100%;font-size:.72rem;color:var(--muted)}
.adv-src a{font:600 .76rem var(--fd);text-decoration:none;padding:3px 9px;border-radius:999px;background:var(--ice);color:var(--ink)}
.adv-chips{display:flex;flex-wrap:wrap;gap:7px}
.adv-chips button{all:unset;cursor:pointer;font:500 .84rem var(--fb);padding:7px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink)}
.adv-chips button:hover{border-color:var(--accent);color:var(--accent)}
.adv-chips button:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.adv-dots{display:inline-flex;gap:4px;padding:4px 2px}.adv-dots i{width:6px;height:6px;border-radius:50%;background:var(--slate);animation:advb 1s infinite}
.adv-dots i:nth-child(2){animation-delay:.15s}.adv-dots i:nth-child(3){animation-delay:.3s}
@keyframes advb{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.adv-card{align-self:stretch;background:var(--surface);border:1.5px solid var(--accent);border-radius:12px;padding:14px;font-size:.9rem}
.adv-card b{font:700 1rem var(--fd);color:var(--ink)}.adv-card p{margin:.3em 0 .6em;color:var(--muted);max-width:none}
.adv-card label{display:block;font:600 .8rem var(--fd);color:var(--ink);margin:8px 0 0}
.adv-card input:not([type=checkbox]){display:block;width:100%;margin-top:4px;padding:9px 11px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);color:var(--text);font:.95rem var(--fb)}
.adv-card input:focus{border-color:var(--accent);outline:none}
.adv-card .adv-chk{display:flex;gap:8px;align-items:flex-start;font:500 .78rem var(--fb);color:var(--muted)}.adv-card .adv-chk input{margin-top:2px}
.adv-card button{margin-top:10px;width:100%;padding:10px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:600 .92rem var(--fd);cursor:pointer}
[data-theme="dark"] .adv-card button{color:#000}
.adv-card button:disabled{opacity:.6}
.adv-err{color:#9b3b2e!important;font-size:.82rem;margin:.4em 0 0!important}[data-theme="dark"] .adv-err{color:#f0a08c!important}
.adv-card.done{border-color:var(--line)}
.adv-in{display:flex;gap:8px;align-items:flex-end;padding:10px 12px;border-top:1px solid var(--line);background:var(--surface)}
.adv-in textarea{flex:1;resize:none;max-height:120px;padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--paper);color:var(--text);font:.95rem/1.4 var(--fb)}
.adv-in textarea:focus{border-color:var(--accent);outline:none}
.adv-in button{padding:10px 14px;border:0;border-radius:10px;background:var(--accent);color:#fff;font:600 .9rem var(--fd);cursor:pointer}
[data-theme="dark"] .adv-in button{color:#000}
.adv-fine{margin:0;padding:0 12px 9px;background:var(--surface);font-size:.7rem;color:var(--muted);max-width:none}.adv-fine a{color:var(--muted)}
@media(max-width:600px){
  .adv-launch{right:14px;bottom:calc(14px + env(safe-area-inset-bottom,0px));padding:6px 14px 6px 6px}
  .adv-panel{inset:0;width:auto;height:auto;border-radius:0;border:0}
  .adv-head small{display:none}
}
@media(prefers-reduced-motion:reduce){.adv-dots i{animation:none;opacity:.7}}
@media print{.adv-launch,.adv-panel{display:none!important}}

/* ================= v0.8 refinement: companion serif, elevation, 3D ================= */
:root{--fs:"Newsreader","Iowan Old Style","Georgia",serif;
  --elev-1:inset 0 1px 0 rgba(255,255,255,.7),0 1px 2px rgba(21,38,93,.05),0 10px 28px -18px rgba(21,38,93,.28);
  --elev-2:inset 0 1px 0 rgba(255,255,255,.75),0 2px 6px rgba(21,38,93,.06),0 28px 60px -30px rgba(21,38,93,.42)}
[data-theme="dark"]{--elev-1:inset 0 1px 0 rgba(255,255,255,.05),0 1px 2px rgba(0,0,0,.4),0 12px 30px -18px rgba(0,0,0,.7);
  --elev-2:inset 0 1px 0 rgba(255,255,255,.06),0 2px 6px rgba(0,0,0,.45),0 30px 70px -30px rgba(0,0,0,.85)}
h2{font-family:var(--fs);font-weight:500;letter-spacing:-.01em;font-size:clamp(1.9rem,3.2vw,2.7rem)}
.answer h2,.keypoints h3{font-family:var(--fs);font-weight:500}
.brandband p{font-family:var(--fs);font-size:1.25rem;line-height:1.4;color:var(--ink)}
.faq summary{font-family:var(--fb)}
.form,.mock,.answer,.brandband{box-shadow:var(--elev-2)}
.top{backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px)}
.feat{border-top-width:1px;border-top-color:var(--line);position:relative;padding-top:18px}
.feat::before{content:"";position:absolute;top:-1px;left:0;width:36px;height:2px;background:var(--accent)}
.keypoints{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);padding:18px 22px;box-shadow:var(--elev-1);max-width:78ch}
.keypoints h3{margin-bottom:.3rem}
.prose{max-width:760px}.prose h2{margin-top:2.2rem;font-size:clamp(1.5rem,2.4vw,2rem)}.prose h2:first-child{margin-top:0}
.prose p,.prose li{font-size:1.05rem;line-height:1.7}
.sec.guide{padding-top:clamp(28px,4vw,48px)}

/* hero with isometric ledger stack */
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:24px;align-items:center}
.stack{position:relative;height:500px;background:none!important;border:0!important;box-shadow:none!important;padding:0!important}
.stack>small{position:absolute;right:6px;bottom:-4px;font-size:.72rem;color:var(--muted)}
.stack-3d{position:absolute;inset:0;transform-style:preserve-3d;perspective:1400px}
.pane{position:absolute;left:50%;top:50%;width:300px;padding:16px 18px;border-radius:14px;border:1px solid var(--line);background:var(--surface);color:var(--text);font-size:.78rem;
  transform-origin:center;box-shadow:var(--elev-2)}
.pane b{display:block;font:600 .84rem var(--fd);color:var(--ink);margin-bottom:8px}
.pane .ln{display:flex;justify-content:space-between;gap:12px;padding:5px 0;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
.pane .ln:last-child{border-bottom:0}
.pane .big{font:700 1.7rem/1.1 var(--fd);color:var(--ink);margin:2px 0 8px;letter-spacing:-.02em}
.pane .chips{display:flex;gap:6px;margin-top:10px}.pane .chips i{font-style:normal;font:600 .68rem var(--fd);padding:3px 8px;border-radius:99px;background:var(--ice);color:var(--ink)}
.p1{transform:translate(-50%,-50%) translate3d(-70px,-150px,0) rotateX(52deg) rotateZ(-32deg);opacity:.94}
.p2{transform:translate(-50%,-50%) translate3d(0,-12px,40px) rotateX(52deg) rotateZ(-32deg)}
.p3{transform:translate(-50%,-50%) translate3d(70px,128px,80px) rotateX(52deg) rotateZ(-32deg);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.p1::after,.p2::after{content:"";position:absolute;left:50%;bottom:-54px;width:1px;height:54px;background:linear-gradient(var(--slate),transparent);opacity:.6}
@media(prefers-reduced-motion:no-preference){
  .stack-3d{animation:stackin 1.1s cubic-bezier(.2,.7,.2,1) both}
  @keyframes stackin{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
}
@media(max-width:1000px){.hero-grid{grid-template-columns:1fr}.stack{display:none}}

/* core capabilities */
.core .grid{margin-top:1.4rem}

/* 3D phone */
.phone-wrap{display:grid;place-items:center;perspective:1300px;background:none!important;border:0!important;box-shadow:none!important;padding:10px 0 0!important;position:relative}
.phone-wrap>small{font-size:.72rem;color:var(--muted);margin-top:10px}
.phone{width:250px;height:510px;border-radius:40px;padding:12px;background:linear-gradient(145deg,#1d2c63,#0b1533);position:relative;
  transform:rotateY(-18deg) rotateX(6deg) rotateZ(1deg);box-shadow:inset 0 0 0 2px rgba(255,255,255,.08),-30px 40px 70px -30px rgba(21,38,93,.55),0 2px 4px rgba(0,0,0,.2)}
.phone .notch{position:absolute;top:18px;left:50%;transform:translateX(-50%);width:84px;height:22px;border-radius:14px;background:#050a1c;z-index:2}
.phone .screen{height:100%;border-radius:30px;background:var(--surface);padding:48px 18px 16px;overflow:hidden;color:var(--text)}
[data-theme="dark"] .phone .screen{background:#0f1b40}
.ph-top{font:700 1rem var(--fd);color:var(--ink);margin-bottom:10px}.ph-top span{color:var(--slate)}
.phone small{display:block;font-size:.7rem;color:var(--muted)}
.ph-big{font:700 1.9rem/1.1 var(--fd);color:var(--ink);letter-spacing:-.02em;margin-top:8px}
.ph-row{display:flex;justify-content:space-between;font-size:.78rem;padding:7px 0;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
.ph-row:first-of-type{margin-top:12px}.ph-row b{color:var(--ink)}
.ph-doc{margin-top:8px;padding:8px 10px;border-radius:10px;background:var(--ice);font:600 .72rem var(--fd);color:var(--ink)}
@media(max-width:700px){.phone{transform:none;width:230px;height:470px}}

/* ---------- v0.9: bylines, author box, calculators ---------- */
.byline{font-size:.86rem;color:var(--muted);margin:-28px auto 8px;position:relative;z-index:1}
.byline a{color:var(--ink);font-weight:600;text-decoration:none}
.authorbox{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);padding:16px 20px;max-width:78ch;box-shadow:var(--elev-1)}
.authorbox b{font-family:var(--fs);font-weight:500;font-size:1.1rem;color:var(--ink)}.authorbox p{margin:.3rem 0 0}
.calc{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(0,1.2fr);gap:28px;align-items:start}
.calc-in{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px;box-shadow:var(--elev-2);display:grid;gap:12px}
.calc-in label{display:grid;gap:5px;font:600 .84rem var(--fd);color:var(--ink)}
.calc-in input,.calc-in select{padding:10px 12px;border:1.5px solid var(--line);border-radius:var(--r-sm);background:var(--paper);color:var(--text);font:1rem var(--fb);font-variant-numeric:tabular-nums}
.calc-in input:focus,.calc-in select:focus{border-color:var(--accent);outline:none}
.calc-in .chkrow{display:flex;gap:8px;align-items:center;font-weight:500;color:var(--muted)}.calc-in .chkrow input{width:auto}
.calc-out td,.calc-out th{font-variant-numeric:tabular-nums}
.calc-sum{margin-top:14px;font-size:1.02rem}.calc-sum b{color:var(--ink)}
.calc-out .err.on{display:block;color:#9b3b2e}
@media(max-width:900px){.calc{grid-template-columns:1fr}}