/* ================= Fuel Blend Helper — shared styles ================= */
:root{
  --ink:#0b1a2b;--ink-2:#1d3350;--paper:#f4f6fa;--card:#ffffff;--line:#e2e8f2;--muted:#5b6b82;
  --blue:#1f6feb;--blue-soft:#eaf1ff;--green:#1faa5b;--green-soft:#e6f7ee;
  --amber:#e8a13a;--amber-soft:#fdf3e2;--red:#d64545;--red-soft:#fdeaea;
  --grad:linear-gradient(90deg,#1f6feb 0%,#12a97a 55%,#1faa5b 100%);
  --shadow:0 1px 2px rgba(11,26,43,.06),0 8px 28px rgba(11,26,43,.07);
  --radius:8px;
  --v-ok-fg:#127a41;--v-c-fg:#a56b13;--v-h-fg:#a83232;
  --nav-bg:rgba(244,246,250,.85);
  --check-bg:#0b1a2b;
}
[data-theme="dark"]{
  --ink:#e8eef7;--ink-2:#c6d3e6;--paper:#0a1320;--card:#111d2e;--line:#22334c;--muted:#93a5be;
  --blue:#5b9bff;--blue-soft:#14263f;--green:#3ecf7e;--green-soft:#0f2c1d;
  --amber:#f0b45c;--amber-soft:#2c2210;--red:#f08a8a;--red-soft:#301717;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 32px rgba(0,0,0,.45);
  --v-ok-fg:#5fe0a0;--v-c-fg:#f0c777;--v-h-fg:#f5a0a0;
  --nav-bg:rgba(10,19,32,.82);
  --check-bg:#0d1a2c;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Inter","Noto Sans",system-ui,sans-serif;color:var(--ink);
  background:var(--paper);line-height:1.38;-webkit-font-smoothing:antialiased;
  transition:background-color .35s ease,color .35s ease;
  animation:pageIn .55s ease both;
}
@keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
h1,h2,h3{font-family:"Space Grotesk",sans-serif;letter-spacing:-.02em;line-height:1.18;margin:0}
.mono{font-family:"Space Mono",monospace}
a{color:var(--blue)}
.wrap{max-width:1000px;margin:0 auto;padding:0 16px}
.panel,.ctx,.cc,.concern,.ref,.faq details,.jug,.stat,.verdict,.ad-box{transition:background-color .35s ease,border-color .35s ease,box-shadow .25s ease,transform .25s ease}

/* ---------- nav + scroll progress ---------- */
header.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:background-color .35s ease,border-color .35s ease}
.nav-inner{display:flex;align-items:center;gap:8px;height:46px}
.brand{display:flex;align-items:center;gap:8px;font-family:"Space Grotesk";font-weight:700;font-size:15px;color:var(--ink);text-decoration:none;flex:0 0 auto}
.brand-logo{display:block;width:auto;height:34px;max-width:148px;object-fit:contain;background:#fff;border:1px solid var(--line);border-radius:8px;padding:3px 7px;box-shadow:0 1px 2px rgba(11,26,43,.06)}
.drop{width:22px;height:22px;border-radius:50%;background:var(--grad);box-shadow:inset 0 0 0 3px var(--card),0 0 0 1px var(--line);animation:dropPulse 4s ease-in-out infinite}
@keyframes dropPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
nav.links{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
nav.links a{color:var(--ink-2);text-decoration:none;font-size:12.5px;font-weight:500;padding:5px 8px;border-radius:8px;transition:background .2s,color .2s}
nav.links a:hover{background:var(--blue-soft);color:var(--blue)}
.lang{border:1px solid var(--line);background:var(--card);border-radius:8px;padding:4px 6px;font:inherit;font-size:12px;color:var(--ink-2);cursor:pointer;max-width:104px}
.theme-btn{border:1px solid var(--line);background:var(--card);border-radius:8px;width:31px;height:29px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink-2);transition:transform .2s,border-color .2s}
.theme-btn:hover{border-color:var(--blue);color:var(--blue);transform:rotate(15deg)}
.theme-btn svg{width:18px;height:18px}
.progress{position:absolute;left:0;bottom:-1px;height:3px;width:0;background:var(--grad);transition:width .15s linear;border-radius:0 3px 3px 0}
.scroll-status{position:fixed;right:14px;bottom:14px;z-index:45;display:flex;align-items:center;gap:8px;min-width:154px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:color-mix(in srgb,var(--card) 92%,transparent);box-shadow:var(--shadow);backdrop-filter:blur(10px);color:var(--ink-2);font-size:12px;font-weight:700}
.scroll-status .pct{font-family:"Space Mono";color:var(--blue)}
.scroll-status .dot{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px var(--green-soft)}
.scroll-status .label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-count{position:fixed;left:14px;bottom:14px;z-index:45;display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:color-mix(in srgb,var(--card) 92%,transparent);box-shadow:var(--shadow);backdrop-filter:blur(10px);color:var(--ink-2);font-size:12px;font-weight:700}
.user-count .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px var(--green-soft)}
.user-count .label{color:var(--muted)}
.user-count .value{font-family:"Space Mono";color:var(--blue);min-width:1ch;text-align:right}
.user-count .sep{color:var(--muted)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:600;font-size:13.5px;padding:9px 14px;border-radius:8px;border:0;cursor:pointer;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease}
.btn-primary{background:var(--ink);color:var(--paper);box-shadow:var(--shadow)}
[data-theme="dark"] .btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{transform:translateY(-2px) scale(1.01)}
.btn-ghost{background:var(--card);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue);transform:translateY(-2px)}

/* ---------- hero ---------- */
.hero{padding:22px 0 14px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:12px;align-items:stretch;position:relative}
.hero .stag{grid-column:span 7;align-self:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:11.5px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--blue);background:var(--blue-soft);padding:5px 10px;border-radius:100px}
.hero h1{font-size:clamp(28px,3.8vw,40px);margin:9px 0 8px;max-width:17ch;letter-spacing:0}
.hero p.lead{font-size:clamp(14px,1.55vw,15.5px);color:var(--muted);max-width:54ch;margin:0 0 12px}
.cta-row{display:flex;gap:8px;flex-wrap:wrap}
.trust{margin-top:8px;font-size:12px;color:var(--muted)}
.hero .stag > *{opacity:0;transform:translateY(16px);animation:rise .6s cubic-bezier(.2,.8,.2,1) forwards}
.hero .stag > :nth-child(1){animation-delay:.05s}
.hero .stag > :nth-child(2){animation-delay:.15s}
.hero .stag > :nth-child(3){animation-delay:.25s}
.hero .stag > :nth-child(4){animation-delay:.35s}
.hero .stag > :nth-child(5){animation-delay:.45s}
@keyframes rise{to{opacity:1;transform:none}}

/* plain first-use card + animated blend vessel */
.hero-card{grid-column:span 5;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px;box-shadow:var(--shadow);position:relative;z-index:1}
.hero-card-head{display:grid;gap:2px;margin-bottom:8px}
.hero-card-head span{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--green)}
.hero-card-head b{font-family:"Space Grotesk";font-size:18px;line-height:1.12;letter-spacing:0}
.plain-list{display:grid;gap:6px}
.plain-list div{display:grid;grid-template-columns:26px 1fr;gap:7px;align-items:start;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:7px}
.plain-list span{width:22px;height:22px;border-radius:7px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-family:"Space Grotesk";font-size:12px}
.plain-list p{margin:0;color:var(--ink-2);font-size:12.8px}
.mini-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}
.mini-actions a{display:flex;align-items:center;justify-content:center;min-height:32px;border-radius:8px;text-decoration:none;font-size:12.5px;font-weight:700;border:1px solid var(--line);background:var(--paper);color:var(--ink-2);transition:transform .15s,border-color .2s,color .2s,background-color .2s}
.mini-actions a:first-child{background:var(--blue);border-color:var(--blue);color:#fff}
.mini-actions a:hover{transform:translateY(-1px);border-color:var(--blue);color:var(--blue)}
.mini-actions a:first-child:hover{color:#fff}
.plain-warning{margin:8px 0 0;padding:8px;border-radius:8px;background:var(--amber-soft);border:1px solid color-mix(in srgb,var(--amber) 35%,transparent);color:var(--v-c-fg);font-size:12px;font-weight:600}
.vessel-wrap{position:absolute;right:-18px;bottom:-44px;z-index:0;opacity:.16;pointer-events:none}
.vessel{width:100%;max-width:260px;margin:0 auto;filter:drop-shadow(0 12px 24px rgba(11,26,43,.18))}
[data-theme="dark"] .vessel{filter:drop-shadow(0 12px 24px rgba(0,0,0,.5))}
.wave{animation:waveMove 6s linear infinite}
.wave2{animation:waveMove 9s linear infinite reverse;opacity:.85}
@keyframes waveMove{from{transform:translateX(0)}to{transform:translateX(-140px)}}
.bubble{animation:bubbleUp 5s ease-in infinite;transform-origin:center}
.bubble.b2{animation-delay:1.6s;animation-duration:6s}
.bubble.b3{animation-delay:3.2s;animation-duration:4.5s}
@keyframes bubbleUp{0%{transform:translateY(0);opacity:0}15%{opacity:.9}85%{opacity:.9}100%{transform:translateY(-120px);opacity:0}}
.marker-line{stroke-dasharray:6 6;animation:dash 1.2s linear infinite}
@keyframes dash{to{stroke-dashoffset:-12}}

/* ---------- sections + scroll reveal ---------- */
section{padding:20px 0;scroll-margin-top:54px}
.sec-tag{font-size:11.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--green)}
.sec-title{font-size:clamp(20px,2.5vw,25px);margin:4px 0 3px}
.sec-sub{color:var(--muted);max-width:58ch;margin:0 0 12px;font-size:13.8px}
.next-cta{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-weight:600;font-size:13px;text-decoration:none;color:var(--blue)}
.next-cta:hover{text-decoration:underline}
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s cubic-bezier(.2,.8,.2,1),transform .6s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
[data-stagger].in > *{opacity:0;transform:translateY(18px);animation:rise .55s cubic-bezier(.2,.8,.2,1) forwards}
[data-stagger].in > :nth-child(1){animation-delay:.02s}
[data-stagger].in > :nth-child(2){animation-delay:.1s}
[data-stagger].in > :nth-child(3){animation-delay:.18s}
[data-stagger].in > :nth-child(4){animation-delay:.26s}
[data-stagger].in > :nth-child(5){animation-delay:.34s}
[data-stagger].in > :nth-child(6){animation-delay:.42s}

/* ---------- ad slots ---------- */
.ad-slot{max-width:1000px;margin:2px auto;padding:0 16px}
.ad-slot-empty{display:none}
.ad-box{position:relative;background:var(--card);border:1px dashed var(--line);border-radius:8px;min-height:58px;display:flex;align-items:center;justify-content:center}
.ad-box .adsbygoogle{width:100%;min-height:58px}
.ad-tag{position:absolute;top:6px;left:10px;font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);opacity:.7}
.ad-ph{font-size:13px;color:var(--muted);opacity:.7}
@media(min-width:820px){.ad-box,.ad-box .adsbygoogle{min-height:66px}}

/* ---------- cards ---------- */
.context,.compat,.concerns{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:1fr;gap:10px;align-items:stretch}
.ctx{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px;box-shadow:var(--shadow);height:100%}
.ctx{text-decoration:none;color:inherit;display:block}
.ctx b{font-family:"Space Grotesk";display:block;font-size:13.2px;margin-bottom:2px}
.ctx span{font-size:12.5px;color:var(--muted)}
.steps .ctx{position:relative;padding-left:44px;min-height:84px}
.steps .ctx,.steps .ctx:first-child,.steps .ctx:nth-child(2),.steps .ctx:nth-child(3),.steps .ctx:nth-child(4){grid-column:auto}
.steps .step-num{position:absolute;left:11px;top:11px;width:24px;height:24px;border-radius:7px;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-family:"Space Grotesk";font-weight:800;font-size:13px}
.steps .ctx:nth-child(4) .step-num{background:var(--amber)}
.ctx:hover,.cc:hover,.concern:hover{transform:translateY(-4px)}
.cc{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px;box-shadow:var(--shadow);border-top:3px solid;height:100%}
.cc,.cc.r1,.cc.r4{grid-column:auto}
.cc.r1{border-top-color:var(--green)}.cc.r2{border-top-color:var(--blue)}
.cc.r3{border-top-color:var(--amber)}.cc.r4{border-top-color:var(--red)}
.cc .risk{font-size:11.5px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.cc h3{font-size:14.5px;margin:4px 0}.cc p{margin:0;font-size:12.8px;color:var(--muted)}
.concern{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px;box-shadow:var(--shadow);height:100%}
.concern,.concern:first-child{grid-column:auto}
.concern .ico{width:28px;height:28px;border-radius:7px;background:var(--blue-soft);display:flex;align-items:center;justify-content:center;font-size:15px;margin-bottom:6px}
.concern h3{font-size:14px;margin-bottom:3px}.concern p{margin:0;font-size:12.8px;color:var(--muted)}

/* ---------- calculator + advisor ---------- */
.calc-grid,.advisor-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:12px;align-items:stretch}
.calc-grid .panel:first-child,.calc-grid .panel.result{grid-column:span 6}
.advisor-grid .panel,.advisor-grid .verdict{grid-column:span 6;align-self:stretch}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow);height:100%}
.field{margin-bottom:10px}.field:last-child{margin-bottom:0}
label.f{display:block;font-weight:600;font-size:13px;margin-bottom:4px}
.hint{font-size:11.8px;color:var(--muted);font-weight:400}
select.inp,input.inp,textarea.inp{width:100%;font:inherit;font-size:13.2px;padding:7px 9px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);transition:border-color .2s}
select.inp:focus,input.inp:focus,textarea.inp:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:var(--blue)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.seg{display:flex;gap:6px;background:var(--paper);padding:5px;border-radius:8px;border:1px solid var(--line)}
.seg button{flex:1;font:inherit;font-weight:600;font-size:13px;padding:6px;border:0;background:transparent;border-radius:8px;cursor:pointer;color:var(--muted);transition:all .2s}
.seg button[aria-pressed="true"]{background:var(--card);color:var(--blue);box-shadow:0 1px 3px rgba(11,26,43,.18)}
input[type=range]{width:100%;accent-color:var(--green);height:6px}
.slider-val{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:4px}
.target-badge{font-family:"Space Grotesk";font-weight:700;font-size:15px;color:var(--green);background:var(--green-soft);padding:3px 10px;border-radius:8px;display:inline-block;transition:transform .2s}
.target-badge.pop{transform:scale(1.15)}

.result h3{font-size:15px;color:var(--muted);font-weight:600;margin-bottom:4px}
.gauge{margin:4px 0 10px}
.gauge-bar{height:14px;border-radius:100px;background:var(--paper);border:1px solid var(--line);overflow:hidden}
.gauge-fill{height:100%;background:var(--grad);width:0;transition:width .45s cubic-bezier(.2,.8,.2,1);background-size:200% 100%;animation:gradShift 5s ease infinite}
@keyframes gradShift{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}
.gauge-scale{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:6px}
.mix-title{font-family:"Space Grotesk";font-weight:600;font-size:13.5px;color:var(--ink-2);margin:0 0 9px;display:flex;align-items:center;gap:8px}
.mix-title .pill{font-size:11px;font-weight:700;background:var(--blue-soft);color:var(--blue);padding:2px 8px;border-radius:100px}
.mix{display:grid;grid-template-columns:1fr auto 1fr;gap:10px}
.jug{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:8px;text-align:center}
.jug .lbl{font-size:12.5px;color:var(--muted);font-weight:600}
.jug .qty{font-family:"Space Mono";font-weight:700;font-size:19px;margin-top:1px}
.jug .u{font-size:12px;color:var(--muted)}
.jug.a{background:var(--green-soft);border-color:color-mix(in srgb,var(--green) 30%,transparent)}
.jug.b{background:var(--blue-soft);border-color:color-mix(in srgb,var(--blue) 30%,transparent)}
.jug.pop{transform:scale(1.04)}
.plus{display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--muted);font-size:20px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.stat{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:8px}
.stat .k{font-size:12px;color:var(--muted);font-weight:600}
.stat .v{font-family:"Space Mono";font-weight:700;font-size:15px;margin-top:1px}
.stat .v small{font-size:12px;color:var(--muted);font-weight:400}
.money{margin-top:8px;background:var(--amber-soft);border:1px solid color-mix(in srgb,var(--amber) 35%,transparent);border-radius:8px;padding:8px 10px}
.money .k{font-size:12.5px;font-weight:700;color:var(--v-c-fg);text-transform:uppercase;letter-spacing:.04em}
.money .row{display:flex;justify-content:space-between;gap:10px;margin-top:6px;font-size:13.5px}
.money .row b{font-family:"Space Mono"}
.disclaimer-inline{font-size:12px;color:var(--muted);margin-top:10px;padding-top:10px;border-top:1px dashed var(--line)}

.verdict{border-radius:var(--radius);padding:12px;border:1px solid var(--line);box-shadow:var(--shadow)}
.verdict .tag{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.verdict h3{font-size:17px;margin:4px 0}
.verdict p{margin:0;font-size:13.5px}
.verdict.swap{animation:verdictIn .4s cubic-bezier(.2,.8,.2,1)}
@keyframes verdictIn{from{opacity:.4;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
.v-ok{background:var(--green-soft);border-color:color-mix(in srgb,var(--green) 35%,transparent)}
.v-ok .tag,.v-ok h3{color:var(--v-ok-fg)}
.v-caution{background:var(--amber-soft);border-color:color-mix(in srgb,var(--amber) 35%,transparent)}
.v-caution .tag,.v-caution h3{color:var(--v-c-fg)}
.v-high{background:var(--red-soft);border-color:color-mix(in srgb,var(--red) 35%,transparent)}
.v-high .tag,.v-high h3{color:var(--v-h-fg)}

/* ---------- checklist ---------- */
.check{background:var(--check-bg);color:#e9eef6;border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.check h2{color:#fff}.check .sec-sub{color:#a9b7cc}
.check ul{list-style:none;padding:0;margin:10px 0 0;display:grid;grid-template-columns:1fr 1fr;grid-auto-rows:1fr;gap:8px}
.check li{display:flex;gap:8px;align-items:flex-start;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:8px 10px;transition:transform .2s;height:100%}
.check li:hover{transform:translateX(4px)}
.check .tick{flex:0 0 24px;height:24px;border-radius:8px;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.check b{display:block;font-family:"Space Grotesk";font-size:14.5px;color:#fff;margin-bottom:2px}
.check span{font-size:13px;color:#a9b7cc}

/* ---------- faq + refs + footer ---------- */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:8px;margin-bottom:10px;overflow:hidden;box-shadow:var(--shadow)}
.faq summary{cursor:pointer;padding:10px 12px;font-weight:600;font-size:13.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;color:var(--blue);font-weight:400;transition:transform .25s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0;padding:0 12px 12px;color:var(--muted);font-size:13px}
.refs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:1fr;gap:10px;margin-top:8px;align-items:stretch}
.ref{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px;height:100%}
.ref{grid-column:auto}
.ref a{font-weight:600;font-size:14.5px;text-decoration:none}
.ref a:hover{text-decoration:underline}
.ref p{margin:6px 0 0;font-size:13px;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:22px 0 34px;margin-top:10px}
.disc{font-size:12.5px;color:var(--muted);max-width:80ch;margin:0 auto;text-align:center}
.foot-links{display:flex;gap:18px;justify-content:center;margin-top:16px;font-size:13px}

/* ---------- inner pages ---------- */
.page-hero{padding:38px 0 18px}
.page-hero h1{font-size:clamp(26px,3.4vw,36px);margin:10px 0 8px}
.page-hero p{color:var(--muted);max-width:62ch;font-size:15.5px;margin:0}
.prose{max-width:760px}
.prose h2{font-size:20px;margin:24px 0 8px}
.prose h3{font-size:16px;margin:18px 0 6px}
.prose p,.prose li{font-size:14px;color:var(--ink-2)}
[data-theme="dark"] .prose p,[data-theme="dark"] .prose li{color:#c6d3e6}
.prose ul{padding-left:20px}
.prose .card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:14px 16px;box-shadow:var(--shadow);margin:12px 0}
.updated{font-size:12.5px;color:var(--muted)}

@media(max-width:860px){
  .hero-grid{grid-template-columns:1fr}
  .hero .stag,.hero-card{grid-column:auto}
  .hero h1{max-width:12ch}
  .vessel-wrap{right:-58px;bottom:-58px}
  .vessel{max-width:190px}
  .context,.compat,.concerns,.calc-grid,.advisor-grid,.refs{grid-template-columns:1fr}
  .steps .ctx,.steps .ctx:first-child,.steps .ctx:nth-child(2),.steps .ctx:nth-child(3),.steps .ctx:nth-child(4),.cc,.cc.r1,.cc.r4,.concern,.concern:first-child,.calc-grid .panel:first-child,.calc-grid .panel.result,.advisor-grid .panel,.advisor-grid .verdict,.ref{grid-column:auto}
  .check ul{grid-template-columns:1fr}
  nav.links{display:none}
  .brand-logo{height:32px;max-width:136px}
  .scroll-status{left:12px;right:12px;bottom:calc(10px + env(safe-area-inset-bottom));min-width:0;justify-content:center}
  .user-count{left:12px;right:12px;bottom:calc(54px + env(safe-area-inset-bottom));min-width:0;justify-content:center;white-space:nowrap;overflow:hidden}
}
@media(max-width:380px){
  .user-count{gap:6px;padding:7px 8px;font-size:11.5px}
  .user-count .dot{width:6px;height:6px}
  .user-count .value{min-width:auto}
}

/* Equalize card grids: every tile in these sections gets the same footprint. */
@media(min-width:861px){
  .steps > .ctx,.compat > .cc,.concerns > .concern{grid-column:auto!important}
  .context,.compat,.concerns{grid-template-columns:repeat(4,minmax(0,1fr))!important;grid-auto-rows:1fr}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal,[data-stagger].in > *,.hero .stag > *{opacity:1!important;transform:none!important}
}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}