/* dieselmaat.shop: one stylesheet for the front page, the account pages and the app */
:root{
  --ink:#16191d;--ink2:#41474f;--mute:#626a73;--line:#e2e5e9;--soft:#f2f4f6;--paper:#fff;
  --rust:#B3471D;--rust-d:#8f3714;--rust-l:#fbefe9;--ok:#2f6b3a;--ok-l:#eaf4ec;--warn:#7a5000;--warn-l:#fff5dc;
  --r:12px;--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 var(--font);letter-spacing:.005em}
img{max-width:100%;display:block}
a{color:var(--rust-d)}
h1,h2,h3{line-height:1.25;margin:0;font-weight:700;letter-spacing:-.01em}
p{margin:0;text-wrap:pretty}
h1,h2,h3{text-wrap:balance}
.alt-link a,footer.site a,.src a{display:inline-block;padding:10px 0;margin:-10px 0}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:720px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--rust);outline-offset:2px}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;min-height:44px;font-weight:700;font-size:1.0625rem;color:var(--ink);text-decoration:none}
.brand img{width:32px;height:32px;border-radius:8px}
.nav .links{display:none;gap:22px;margin-left:12px}
.nav .links a,.nav .login{color:var(--ink2);text-decoration:none;font-size:.9375rem;padding:10px 2px}
.nav .links a:hover,.nav .login:hover{color:var(--rust-d)}
.nav .end{margin-left:auto;display:flex;align-items:center;gap:14px}
@media (min-width:820px){.nav .links{display:flex}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;border-radius:999px;border:1px solid transparent;background:var(--rust);color:#fff;font:600 1rem/1.2 var(--font);text-decoration:none;cursor:pointer}
.btn:hover{background:var(--rust-d)}
.btn.small{min-height:40px;padding:8px 16px;font-size:.9375rem}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--ink2);background:#fff}
.btn.quiet{background:transparent;color:var(--rust-d);border-color:transparent;padding-left:8px;padding-right:8px}
.btn.quiet:hover{background:var(--rust-l)}
.btn.danger{background:#fff;color:#a12a1a;border-color:#e8c4bd}
.btn[disabled]{opacity:.55;cursor:default}
.nav .btn{min-height:40px;padding:8px 16px;font-size:.9375rem}

/* hero */
.hero{padding:48px 0 56px;background:#fff}
.hero .grid{display:grid;gap:48px}
.eyebrow{display:inline-block;font-size:.8125rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--rust-d);margin-bottom:16px}
.hero h1{font-size:clamp(1.9rem,5.2vw,3rem);max-width:17em}
.hero .sub{margin-top:20px;font-size:1.0625rem;color:var(--ink2);max-width:36em}
.cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;margin-top:28px}
.cta .note{font-size:.9375rem;color:var(--mute)}
@media (min-width:980px){.hero{padding:88px 0 96px}.hero .grid{grid-template-columns:1fr 1.05fr;align-items:center}}

/* the product screen */
.screen{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 1px 2px rgba(0,0,0,.04),0 18px 40px -18px rgba(60,30,10,.18);overflow:hidden;font-size:.875rem}
.screen .bar{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);background:#f8f9fa}
.screen .bar b{font-size:.875rem}
.screen .bar .tag{margin-left:auto}
.tag{display:inline-block;font-size:.75rem;font-weight:600;padding:2px 9px;border-radius:999px;background:var(--soft);color:var(--ink2);white-space:nowrap}
.tag.rust{background:var(--rust-l);color:var(--rust-d)}
.tag.ok{background:var(--ok-l);color:var(--ok)}
.tag.warn{background:var(--warn-l);color:var(--warn)}
.screen .prices{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}
.screen .prices div{padding:12px 16px}
.screen .prices div+div{border-left:1px solid var(--line)}
.screen small,.muted{color:var(--mute)}
.screen small{font-size:12.5px}
.screen .big{font-size:1.25rem;font-weight:700;display:block;font-variant-numeric:tabular-nums}
.screen table{width:100%;border-collapse:collapse}
.screen th{font-size:.75rem;font-weight:600;color:var(--mute);text-align:left;padding:10px 16px 6px}
.screen td{padding:10px 16px;border-top:1px solid var(--line);vertical-align:top;font-variant-numeric:tabular-nums}
.screen td.n,.screen th.n{text-align:right;white-space:nowrap}
.screen td b{font-weight:600}
.screen .foot{padding:10px 16px;border-top:1px solid var(--line);background:#f8f9fa;color:var(--mute);font-size:.8125rem}
@media (max-width:520px){.screen .hide-s{display:none}}

/* sections */
section{padding:56px 0}
@media (min-width:820px){section{padding:80px 0}}
section.alt{background:var(--soft)}
.sec-head{max-width:40em;margin-bottom:36px}
.sec-head h2{font-size:clamp(1.5rem,3.6vw,2.1rem)}
.sec-head p{margin-top:12px;color:var(--ink2)}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:20px;counter-reset:s}
.steps li{counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--rust);color:#fff;font-weight:700;margin-bottom:14px}
.steps h3{font-size:1.0625rem}
.steps p{margin-top:8px;color:var(--ink2);font-size:.9375rem}
@media (min-width:820px){.steps{grid-template-columns:repeat(3,1fr)}}
.feats{display:grid;gap:20px}
.feat{border-top:2px solid var(--rust);padding-top:18px}
.feat h3{font-size:1.0625rem}
.feat p{margin-top:8px;color:var(--ink2);font-size:.9375rem}
@media (min-width:720px){.feats{grid-template-columns:1fr 1fr;gap:36px 48px}}

/* today's diesel and the calculator */
.two{display:grid;gap:28px}
@media (min-width:900px){.two{grid-template-columns:1fr 1fr;align-items:start}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card h3{font-size:1.0625rem;margin-bottom:12px}
.kv{display:grid;grid-template-columns:1fr auto;gap:8px 16px;font-variant-numeric:tabular-nums}
.kv dt{color:var(--ink2)}
.kv dd{margin:0;text-align:right;font-weight:600}
.kv .sep{grid-column:1/-1;border-top:1px solid var(--line);margin:6px 0}
.note-box{margin-top:16px;padding:12px 14px;border-radius:10px;background:var(--warn-l);color:#5b4210;font-size:.875rem}
.src{margin-top:14px;font-size:.8125rem;color:var(--mute)}

/* forms */
form .row{display:grid;gap:14px}
@media (min-width:560px){form .row.c2{grid-template-columns:1fr 1fr}form .row.c3{grid-template-columns:1fr 1fr 1fr}}
label{display:grid;gap:6px;font-size:.9375rem;font-weight:500}
label .hint{font-weight:400;font-size:.8125rem;color:var(--mute)}
input,select,textarea{font:inherit;font-size:1rem;color:var(--ink);background:#fff;border:1px solid #cfc9bd;border-radius:10px;padding:11px 12px;min-height:46px;width:100%}
textarea{min-height:120px;line-height:1.55}
input:focus,select:focus,textarea:focus{border-color:var(--rust);outline:2px solid rgba(179,71,29,.2);outline-offset:0}
.check{display:flex;align-items:flex-start;gap:10px;font-weight:400}
.check input{width:20px;height:20px;min-height:0;margin-top:3px;accent-color:var(--rust);flex:none}
.seg{display:flex;flex-wrap:wrap;gap:8px;border:0;padding:0;margin:0}
.seg legend{font-size:.9375rem;font-weight:500;margin-bottom:6px;padding:0}
.seg label{display:flex;align-items:center;gap:8px;border:1px solid #cfc9bd;border-radius:999px;padding:8px 14px;font-weight:500;cursor:pointer;min-height:44px}
.seg input{width:18px;height:18px;min-height:0;accent-color:var(--rust);margin:0}
.seg label:has(input:checked){border-color:var(--rust);background:var(--rust-l)}
.form-stack{display:grid;gap:16px}
.msg{font-size:.9375rem;padding:10px 14px;border-radius:10px;background:var(--rust-l);color:var(--rust-d)}
.msg.ok{background:var(--ok-l);color:var(--ok)}
.msg[hidden]{display:none}

/* result block (calculator and app) */
.result{display:grid;gap:4px;margin-top:18px;padding:18px;border-radius:12px;background:var(--rust-l)}
.result .pct{font-size:2rem;font-weight:700;color:var(--rust-d);line-height:1.1;font-variant-numeric:tabular-nums}
.result p{font-size:.9375rem;color:var(--ink2)}

/* letter and email samples */
.paper{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;font-size:.9375rem;line-height:1.7;white-space:pre-wrap;word-wrap:break-word;box-shadow:0 12px 30px -20px rgba(60,30,10,.25)}
.paper .head{display:block;font-size:.8125rem;color:var(--mute);border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:14px;white-space:normal}
.paper .sum{font-family:var(--mono);font-size:.8125rem;background:var(--soft);display:block;padding:8px 10px;border-radius:8px;white-space:pre-wrap}

/* price */
.plan{max-width:520px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px;text-align:center;box-shadow:0 18px 40px -24px rgba(60,30,10,.25)}
.plan .amt{font-size:3rem;font-weight:700;letter-spacing:-.02em;line-height:1;margin-top:10px}
.plan .amt small{font-size:1rem;font-weight:500;color:var(--mute);letter-spacing:0}
.plan ul{list-style:none;padding:0;margin:24px 0;text-align:left;display:grid;gap:10px}
.plan li{padding-left:28px;position:relative}
.plan li::before{content:"";position:absolute;left:4px;top:.55em;width:12px;height:7px;border-left:2px solid var(--rust);border-bottom:2px solid var(--rust);transform:rotate(-45deg)}

/* faq */
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;list-style:none;padding:16px 32px 16px 0;font-weight:600;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:12px;font-size:1.4rem;font-weight:400;color:var(--rust)}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 0 18px;color:var(--ink2)}
.sources{margin-top:40px}
.sources ul{padding-left:20px;color:var(--ink2)}
.sources li{margin:6px 0}

/* band and footer */
.band{background:var(--rust);color:#fff;text-align:center;padding:72px 0}
.band h2{font-size:clamp(1.5rem,3.8vw,2.2rem);max-width:22em;margin:0 auto}
.band p{margin-top:12px;opacity:.92}
.band .btn{background:#fff;color:var(--rust-d);margin-top:28px}
.band .btn:hover{background:#fbefe9}
footer.site{padding:40px 0 48px;font-size:.875rem;color:var(--mute);border-top:1px solid var(--line)}
footer.site .wrap{display:grid;gap:12px}
footer.site a{color:var(--ink2)}
footer.site .syng-legal-links a{margin:0 2px}

/* auth pages */
.auth{min-height:calc(100vh - 64px);display:grid;place-items:start center;padding:48px 20px 72px;background:var(--soft)}
.auth .card{width:100%;max-width:440px;padding:32px 28px}
.auth h1{font-size:1.6rem;margin-bottom:8px}
.auth .lead{color:var(--ink2);margin-bottom:24px}
.auth .alt-link{margin-top:20px;font-size:.9375rem;color:var(--ink2)}

/* app */
.app-main{padding:28px 0 64px;background:var(--soft);min-height:calc(100vh - 64px)}
.app-grid{display:grid;gap:20px}
.banner{padding:14px 18px;border-radius:12px;background:#fff;border:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center}
.banner.warn{background:var(--warn-l);border-color:#f0dfae}
.banner.rust{background:var(--rust-l);border-color:#f0d3c6}
#list{display:grid;gap:16px}
.cust{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}
.cust-top{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 12px}
.cust-top h3{font-size:1.125rem}
.cust-top .actions{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.nums{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:16px}
@media (min-width:720px){.nums{grid-template-columns:repeat(4,1fr)}}
.num{background:var(--soft);border-radius:10px;padding:12px 14px}
.num small{display:block;color:var(--mute);font-size:.8125rem}
.num b{display:block;font-size:1.125rem;font-variant-numeric:tabular-nums}
.num.hl{background:var(--rust-l)}
.num.hl b{color:var(--rust-d);font-size:1.375rem}
.lines{margin-top:14px;display:grid;gap:6px;font-size:.9375rem}
.how{margin-top:12px;font-size:.875rem;color:var(--ink2)}
.how summary{cursor:pointer;color:var(--rust-d);font-weight:500}
.how pre{font-family:var(--mono);font-size:.8125rem;background:var(--soft);padding:10px 12px;border-radius:8px;white-space:pre-wrap;margin:10px 0 0}
.letter-box{margin-top:14px;display:grid;gap:10px}
.letter-box textarea{min-height:320px;font-size:.9375rem}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.empty{text-align:center;padding:36px 20px;color:var(--ink2)}
dialog{border:0;border-radius:16px;padding:0;width:min(640px,calc(100vw - 24px));max-height:calc(100vh - 40px);box-shadow:0 30px 80px rgba(0,0,0,.3)}
dialog::backdrop{background:rgba(20,15,10,.45)}
dialog .dlg{padding:24px}
dialog h2{font-size:1.25rem;margin-bottom:16px}
.hist{width:100%;border-collapse:collapse;font-size:.875rem;font-variant-numeric:tabular-nums}
.hist th,.hist td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line)}
.hist td.n,.hist th.n{text-align:right}
@media (prefers-reduced-motion:no-preference){.btn{transition:background-color .15s,border-color .15s}}