@font-face{font-family:"Caveat";src:url(/fonts/caveat-normal-500-700.woff2) format("woff2");font-style:normal;font-weight:500 700;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/ibm-plex-mono-normal-400.woff2) format("woff2");font-style:normal;font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/ibm-plex-mono-normal-500.woff2) format("woff2");font-style:normal;font-weight:500;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/ibm-plex-mono-normal-600.woff2) format("woff2");font-style:normal;font-weight:600;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/fonts/ibm-plex-sans-normal-400.woff2) format("woff2");font-style:normal;font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/fonts/ibm-plex-sans-normal-500.woff2) format("woff2");font-style:normal;font-weight:500;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/fonts/ibm-plex-sans-normal-600.woff2) format("woff2");font-style:normal;font-weight:600;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/fonts/ibm-plex-sans-normal-700.woff2) format("woff2");font-style:normal;font-weight:700;font-display:swap}
@font-face{font-family:"Newsreader";src:url(/fonts/newsreader-italic-400-600.woff2) format("woff2");font-style:italic;font-weight:400 600;font-display:swap}
@font-face{font-family:"Newsreader";src:url(/fonts/newsreader-normal-400-700.woff2) format("woff2");font-style:normal;font-weight:400 700;font-display:swap}
/* CustomsExamPrep — "worked answer key" editorial system */
:root{
  --paper:#f5f1e8;--paper-2:#efe9dc;--card:#fffdf8;--ink:#14202e;--ink-2:#3b4654;--muted:#6b6a63;
  --rule:#ddd5c4;--rule-2:#c9bfab;--navy:#13294b;--red:#b3261e;--red-soft:#f6e3df;--green:#1d6b47;--green-soft:#e2efe6;
  --pen:#c0392b;--hl:#fde68a;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;--sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;--hand:"Caveat","Segoe Print",cursive;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);font-size:17px;line-height:1.65;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.5;background-image:radial-gradient(rgba(20,32,46,.035) 1px,transparent 1px);background-size:3px 3px}
img{max-width:100%;display:block}
a{color:var(--navy);text-decoration-color:var(--rule-2);text-underline-offset:3px}
a:hover{text-decoration-color:var(--navy)}
.mono,code{font-family:var(--mono);font-size:.9em}
.container{max-width:1180px;margin:0 auto;padding:0 28px}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:inline-flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--red)}

/* header */
.site-header{border-bottom:1px solid var(--rule);background:rgba(245,241,232,.9);backdrop-filter:blur(8px);position:sticky;top:0;z-index:40}
.site-header .container{height:72px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.logo .mark{width:34px;height:34px;flex:none}
.logo .word{font-family:var(--serif);font-size:22px;font-weight:600;letter-spacing:-.01em}
.logo .word i{font-weight:500;color:var(--red)}
.nav{display:flex;align-items:center;gap:30px}
.nav a{text-decoration:none;color:var(--ink-2);font-weight:500;font-size:15px}
.nav a:hover{color:var(--ink)}
@media(max-width:760px){.nav a:not(.btn){display:none}}

/* buttons/forms */
.btn{display:inline-flex;align-items:center;gap:10px;justify-content:center;font:600 15.5px/1 var(--sans);padding:15px 22px;border-radius:4px;border:1.5px solid var(--ink);text-decoration:none;cursor:pointer;transition:transform .12s,box-shadow .12s;white-space:nowrap}
.btn-ink{background:var(--ink);color:var(--paper);box-shadow:4px 4px 0 var(--red)}
.btn-ink:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--red)}
.btn-line{background:transparent;color:var(--ink)}
.nav .btn{padding:11px 16px;font-size:14px;box-shadow:3px 3px 0 var(--red)}
.signup{display:flex;gap:12px;max-width:540px}
.signup input{flex:1;min-width:0;height:54px;padding:0 16px;border:1.5px solid var(--ink);border-radius:4px;background:var(--card);font:500 16px var(--sans);color:var(--ink);outline:none}
.signup input:focus{box-shadow:0 0 0 4px rgba(19,41,75,.12)}
.signup .btn{height:54px}
.form-msg{min-height:22px;margin-top:10px;font-size:14.5px;font-weight:500}
.form-msg.ok{color:var(--green)}.form-msg.err{color:var(--red)}
@media(max-width:560px){.signup{flex-direction:column}.signup input{flex:none;width:100%}.signup .btn{width:100%}}

/* hero */
.hero{padding:72px 0 88px;border-bottom:1px solid var(--rule)}
.hero .container{display:grid;grid-template-columns:1.08fr .92fr;gap:64px;align-items:center}
@media(max-width:1000px){.hero .container{grid-template-columns:1fr;gap:48px}.hero{padding:44px 0 64px}}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(44px,6.2vw,82px);line-height:.98;letter-spacing:-.025em;margin:22px 0 24px}
.hero h1 em{font-style:italic;color:var(--red);font-weight:400}
.hero .sub{font-size:19px;line-height:1.6;color:var(--ink-2);max-width:560px;margin:0 0 32px}
.hero .fine{font-size:13.5px;color:var(--muted);font-family:var(--mono);letter-spacing:.02em}

/* answer-sheet object */
.sheet{position:relative;background:var(--card);border:1px solid var(--rule-2);box-shadow:0 1px 0 var(--rule),0 24px 50px -28px rgba(20,32,46,.45),0 8px 18px -12px rgba(20,32,46,.25);padding:30px 30px 26px 54px;transform:rotate(1.2deg);background-image:linear-gradient(90deg,transparent 38px,rgba(179,38,30,.35) 38px,rgba(179,38,30,.35) 39.5px,transparent 39.5px),repeating-linear-gradient(180deg,transparent 0 31px,rgba(19,41,75,.07) 31px 32px)}
@media(max-width:1000px){.sheet{transform:none}}
.sheet .hdr{display:flex;justify-content:space-between;font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);border-bottom:1.5px solid var(--ink);padding-bottom:10px;margin-bottom:16px}
.sheet .q{font-family:var(--serif);font-size:19px;line-height:1.4;margin:0 0 16px}
.sheet .opt{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:15px;padding:7px 0;position:relative}
.sheet .opt .b{width:24px;height:24px;border:1.5px solid var(--ink);border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:600;flex:none}
.sheet .opt.right .b{background:var(--ink);color:var(--card)}
.sheet .opt.wrong{color:var(--muted);text-decoration:line-through;text-decoration-color:var(--pen);text-decoration-thickness:2px}
.sheet .note{font-family:var(--hand);color:var(--pen);font-size:23px;line-height:1.15;margin-top:14px;max-width:330px;transform:rotate(-1.5deg)}
.sheet .ring{position:absolute;left:44px;top:0;width:44px;height:34px;border:2.5px solid var(--pen);border-radius:50%;transform:rotate(-8deg)}
.stamp{position:absolute;right:-18px;top:-26px;transform:rotate(9deg);font-family:var(--mono);font-weight:600;letter-spacing:.18em;font-size:15px;color:var(--red);border:3px solid var(--red);padding:10px 16px 8px;border-radius:6px;background:rgba(255,253,248,.85);box-shadow:inset 0 0 0 2px var(--card),inset 0 0 0 4px var(--red);opacity:.9}
.stamp small{display:block;font-size:9.5px;letter-spacing:.2em;font-weight:500}
.cite-line{margin-top:16px;padding-top:12px;border-top:1px dashed var(--rule-2);font-family:var(--mono);font-size:12px;color:var(--muted)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--rule)}
.stats .s{padding:30px 28px;border-left:1px solid var(--rule)}.stats .s:first-child{border-left:0;padding-left:0}
.stats .n{font-family:var(--serif);font-size:46px;line-height:1;letter-spacing:-.02em}
.stats .n em{color:var(--red);font-style:normal}
.stats .l{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:10px;line-height:1.5}
@media(max-width:820px){.stats{grid-template-columns:1fr 1fr}.stats .s{border-top:1px solid var(--rule)}.stats .s:nth-child(odd){border-left:0;padding-left:0}}

/* sections */
section{padding:96px 0}
.sec-label{font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);margin-bottom:14px}
h2{font-family:var(--serif);font-weight:500;font-size:clamp(34px,4.2vw,54px);line-height:1.04;letter-spacing:-.02em;margin:0 0 18px}
h2 em{font-style:italic;color:var(--red);font-weight:400}
.lede{font-size:19px;color:var(--ink-2);max-width:660px;margin:0}
.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:start}
@media(max-width:940px){.split{grid-template-columns:1fr;gap:36px}}

.vs{display:grid;grid-template-columns:1fr 1fr;border:1.5px solid var(--ink);background:var(--card)}
@media(max-width:760px){.vs{grid-template-columns:1fr}}
.vs>div{padding:28px}.vs>div+div{border-left:1.5px solid var(--ink)}
@media(max-width:760px){.vs>div+div{border-left:0;border-top:1.5px solid var(--ink)}}
.vs h3{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 16px;color:var(--muted);font-weight:500}
.keyline{font-family:var(--mono);font-size:15px;padding:16px;background:var(--paper-2);border:1px dashed var(--rule-2)}
.vs .meh{color:var(--muted);font-size:15px;margin:16px 0 0}
.checks{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.checks li{display:grid;grid-template-columns:28px 1fr;gap:10px;font-size:15.5px;line-height:1.5}
.checks li span:first-child{font-family:var(--mono);color:var(--red);font-weight:600}

.features{display:grid;grid-template-columns:repeat(3,1fr);border-top:1.5px solid var(--ink)}
@media(max-width:900px){.features{grid-template-columns:1fr 1fr}}@media(max-width:600px){.features{grid-template-columns:1fr}}
.feature{padding:28px 28px 30px 0;border-bottom:1px solid var(--rule)}
.feature .no{font-family:var(--mono);font-size:12px;color:var(--red);letter-spacing:.1em}
.feature h3{font-family:var(--serif);font-weight:500;font-size:25px;line-height:1.15;margin:10px 0 8px;letter-spacing:-.01em}
.feature p{margin:0;color:var(--ink-2);font-size:15.5px;max-width:330px}

.exams{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border:1.5px solid var(--ink);background:var(--card)}
@media(max-width:980px){.exams{grid-template-columns:repeat(3,1fr)}}@media(max-width:600px){.exams{grid-template-columns:1fr 1fr}}
.exam{padding:22px;border-left:1px solid var(--rule);text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:6px;min-height:150px}
.exam:first-child{border-left:0}
a.exam:hover{background:var(--paper)}
.exam .when{font-family:var(--serif);font-size:24px;line-height:1.1}
.exam .meta{font-family:var(--mono);font-size:12px;color:var(--muted);letter-spacing:.04em;margin-top:auto}
.tag{align-self:flex-start;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;padding:3px 8px;border:1px solid currentColor;border-radius:3px}
.tag.live{color:var(--green)}.tag.wip{color:var(--muted)}

.faq{border-top:1.5px solid var(--ink);max-width:820px}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{list-style:none;cursor:pointer;padding:22px 0;font-family:var(--serif);font-size:22px;display:flex;justify-content:space-between;gap:20px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--red)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0 0 22px;color:var(--ink-2);max-width:700px}

.closer{background:var(--navy);color:var(--paper);padding:64px;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;position:relative;box-shadow:8px 8px 0 var(--red)}
.closer h2{color:var(--paper)}.closer h2 em{color:#f3b6ae}.closer p{color:#c9d1dc;margin:0;font-size:17.5px}
.closer .signup input{border-color:var(--paper)}
.closer .btn-ink{background:var(--paper);color:var(--ink);border-color:var(--paper)}
@media(max-width:860px){.closer{grid-template-columns:1fr;padding:36px}}

/* footer */
.site-footer{border-top:1.5px solid var(--ink);margin-top:56px;padding:44px 0 36px;font-size:14.5px;color:var(--ink-2)}
.site-footer .container{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px}
.site-footer h4{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;font-weight:500}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:7px}
.site-footer a{color:var(--ink);text-decoration:none}.site-footer a:hover{text-decoration:underline}
.site-footer .legal{grid-column:1/-1;border-top:1px solid var(--rule);padding-top:18px;font-size:13px;color:var(--muted)}
@media(max-width:760px){.site-footer .container{grid-template-columns:1fr}}

/* question page */
.q-top{padding:44px 0 28px;border-bottom:1px solid var(--rule)}
.crumbs{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;color:var(--muted)}.crumbs a{color:var(--muted)}
.q-top h1{font-family:var(--serif);font-weight:500;font-size:clamp(32px,4vw,48px);line-height:1.08;letter-spacing:-.02em;margin:14px 0 14px;max-width:900px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border:1px solid var(--rule-2);border-radius:3px;color:var(--ink-2);background:var(--card)}
.q-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;padding:40px 0}
@media(max-width:980px){.q-layout{grid-template-columns:1fr}}
.qcard{background:var(--card);border:1.5px solid var(--ink);padding:34px;box-shadow:6px 6px 0 var(--paper-2)}
@media(max-width:600px){.qcard{padding:22px}}
.context{font-size:15.5px;color:var(--ink-2);border-left:3px solid var(--rule-2);padding-left:16px;margin-bottom:22px}
.qcard .stem{font-family:var(--serif);font-size:23px;line-height:1.4;margin:0 0 22px}
.choice{display:flex;gap:14px;align-items:flex-start;width:100%;text-align:left;background:transparent;border:0;border-top:1px solid var(--rule);padding:15px 4px;font:500 16.5px/1.5 var(--sans);color:var(--ink);cursor:pointer}
.choice:last-of-type{border-bottom:1px solid var(--rule)}
.choice:hover:not([disabled]){background:var(--paper)}
.choice .k{flex:none;width:28px;height:28px;border:1.5px solid var(--ink);border-radius:50%;display:grid;place-items:center;font:600 13px var(--mono);margin-top:-1px}
.choice[disabled]{cursor:default}
.choice.correct .k{background:var(--green);border-color:var(--green);color:#fff}.choice.correct{color:var(--green)}
.choice.incorrect .k{background:var(--red);border-color:var(--red);color:#fff}.choice.incorrect span:last-child{text-decoration:line-through;text-decoration-color:var(--pen)}
.result{display:none;margin-top:18px;font-family:var(--hand);font-size:27px;line-height:1.2}
.result.show{display:block}.result.good{color:var(--green)}.result.bad{color:var(--pen)}
.reveal-link{margin-top:14px;background:none;border:0;padding:0;font:500 14px var(--mono);letter-spacing:.04em;color:var(--navy);cursor:pointer;text-decoration:underline;text-underline-offset:4px}
.explain{display:none}.explain.show{display:block}
.explain h2{font-size:32px;margin:40px 0 12px}
.explain h3{font-family:var(--serif);font-weight:600;font-size:21px;margin:26px 0 8px}
.explain p,.explain li{color:var(--ink-2)}
.legal-text{margin:14px 0;padding:16px 20px;background:var(--paper);border-left:3px solid var(--navy);font-family:var(--serif);font-size:18px;line-height:1.5;color:var(--ink)}
.legal-text .src{display:block;font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.legal-text .mono{font-size:15px}
.wrong-list{display:grid;gap:0;margin:12px 0;border-top:1px solid var(--rule)}
.wrong{padding:16px 0;border-bottom:1px solid var(--rule);font-size:16px;color:var(--ink-2)}
.wrong b{color:var(--red)}
.tip{display:grid;grid-template-columns:auto 1fr;gap:12px;margin:24px 0;padding:18px 20px;background:#fff7d6;border:1px solid #ecd68a;color:#5c4a12;font-size:16px}
.tip>span{font-family:var(--hand);font-size:24px;line-height:1;color:var(--pen)}
.official{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:28px;padding-top:16px;border-top:1.5px solid var(--ink);font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.sources{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.side{display:grid;gap:20px;align-content:start;position:sticky;top:96px}
@media(max-width:980px){.side{position:static}}
.side-card{background:var(--card);border:1.5px solid var(--ink);padding:20px}
.side-card h4{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 14px;font-weight:500;color:var(--muted)}
.qgrid{display:grid;grid-template-columns:repeat(8,1fr);gap:4px}
.qgrid a,.qgrid span{display:grid;place-items:center;height:27px;font:500 11.5px var(--mono);text-decoration:none;color:var(--rule-2);border:1px solid var(--rule)}
.qgrid a{color:var(--ink);border-color:var(--ink-2)}.qgrid a.cur{background:var(--ink);color:var(--paper)}
.side-card.dark{background:var(--navy);color:var(--paper);border-color:var(--navy);box-shadow:6px 6px 0 var(--red)}
.side-card.dark h4{color:#c9d1dc}.side-card.dark p{margin:0 0 14px;font-family:var(--serif);font-size:19px;line-height:1.35}
.side-card.dark .signup{flex-direction:column}.side-card.dark .signup input{flex:none;width:100%;border-color:var(--paper)}
.side-card.dark .btn-ink{background:var(--paper);color:var(--ink);border-color:var(--paper);box-shadow:none}
.side-card.dark .form-msg.ok{color:#9be3b8}.side-card.dark .form-msg.err{color:#f3b6ae}
.closer .form-msg.ok{color:#9be3b8}.closer .form-msg.err{color:#f3b6ae}
.nav a.btn,.nav a.btn:hover{color:var(--paper)}
.logo .word{white-space:nowrap}
@media(max-width:560px){.logo .word{font-size:18px}.logo .mark{width:28px;height:28px}.nav .btn{padding:9px 12px;font-size:13px}.stamp{right:4px;top:-30px;font-size:13px}.site-header .container{padding:0 18px}}