:root { --ink:#182233; --ink-soft:#293d5a; --night:#111a29; --night-2:#202d43; --paper:#f4f0e8; --paper-deep:#e9e2d6; --cream:#fffaf0; --rule:#cfc4b4; --blue:#5b78a8; --blue-pale:#d8e1ec; --accent:#b84e3a; --accent-dark:#963d2d; --max:1200px; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--paper); color:var(--ink); font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; font-size:16px; line-height:1.65; }
a { color:#345f91; text-decoration-color:rgba(52,95,145,.45); text-decoration-thickness:1px; text-underline-offset:3px; }
a:hover { color:var(--accent-dark); }
.skip { position:absolute; left:-999px; top:0; z-index:10; padding:.7rem 1rem; background:var(--cream); color:var(--ink); }
.skip:focus { left:1rem; top:1rem; }
.shell { width:min(100%,var(--max)); margin:auto; padding:0 1.6rem; }
header { position:relative; z-index:2; background:var(--night); }
.nav { min-height:76px; display:flex; align-items:center; justify-content:space-between; gap:1.4rem; }
.brand { display:inline-flex; align-items:center; color:var(--cream); font-size:1.2rem; font-weight:850; letter-spacing:-.045em; text-decoration:none; white-space:nowrap; }
.brand::after { content:"UK CBAM / 2027"; margin-left:.82rem; padding-left:.82rem; border-left:1px solid rgba(255,250,240,.3); color:#d6dfeb; font-size:.61rem; font-weight:800; letter-spacing:.11em; text-transform:uppercase; }
.brand-mark { display:grid; width:1.18rem; height:1.18rem; margin-right:.46rem; place-items:center; background:var(--accent); box-shadow:inset 0 0 0 2px #f9c49a; }
.brand-mark::after { content:""; width:.34rem; height:.34rem; background:var(--cream); }
nav { display:flex; align-items:center; gap:1.15rem; font-size:.91rem; }
nav a { color:#e6e2da; text-decoration:none; white-space:nowrap; }
nav a:hover,nav a[aria-current="page"] { color:#fff; }
.button { display:inline-flex; align-items:center; justify-content:center; border:1px solid var(--accent); border-radius:0; background:var(--accent); color:#fffaf0; padding:.72rem 1rem; font-weight:800; line-height:1.2; text-decoration:none; }
.button:hover { background:var(--accent-dark); border-color:var(--accent-dark); color:#fff; }
.button.secondary { border-color:var(--ink); background:transparent; color:var(--ink); }
.button.secondary:hover { background:var(--ink); color:var(--cream); }
.eyebrow { color:var(--accent-dark); font-size:.76rem; font-weight:850; letter-spacing:.13em; text-transform:uppercase; }
.hero { position:relative; overflow:hidden; padding:6.4rem 0 4.7rem; background:var(--night); color:var(--cream); }
.hero::before { content:""; position:absolute; inset:0; opacity:.22; background-image:linear-gradient(rgba(216,225,236,.2) 1px,transparent 1px),linear-gradient(90deg,rgba(216,225,236,.2) 1px,transparent 1px); background-size:4rem 4rem; mask-image:linear-gradient(90deg,transparent 0%,black 35%,black 100%); }
.hero::after { content:""; position:absolute; top:-10rem; right:-7rem; width:36rem; height:36rem; border:1px solid rgba(216,225,236,.3); border-radius:50%; box-shadow:0 0 0 3.8rem rgba(91,120,168,.08),0 0 0 7.6rem rgba(91,120,168,.045); }
.hero-grid { position:relative; z-index:1; display:grid; grid-template-columns:minmax(0,1.35fr) minmax(275px,.65fr); gap:4.2rem; align-items:end; }
.hero .eyebrow { color:#ef927c; }
h1,h2,h3 { color:var(--ink); letter-spacing:-.05em; line-height:1.09; }
h1 { max-width:820px; margin:.7rem 0 1.2rem; font-size:clamp(2.65rem,6vw,5rem); }
.hero h1 { color:var(--cream); }
h2 { max-width:900px; margin:3.8rem 0 1rem; font-size:clamp(1.75rem,3.3vw,2.55rem); }
h3 { margin:1.55rem 0 .45rem; font-size:1.22rem; }
p { max-width:880px; margin:.55rem 0 1rem; }
.lede { max-width:750px; color:var(--ink-soft); font-size:1.2rem; }
.hero .lede { color:#eef0ec; font-size:1.26rem; }
.hero-actions { display:flex; flex-wrap:wrap; gap:.8rem; margin-top:1.7rem; }
.hero .button.secondary { border-color:#b8c5d6; color:var(--cream); }
.hero .button.secondary:hover { background:#e7e0d5; border-color:#e7e0d5; color:var(--night); }
.hero-card,.callout { position:relative; border:1px solid rgba(216,225,236,.45); border-radius:0; background:var(--night-2); color:#d4dce7; padding:1.65rem; box-shadow:12px 12px 0 rgba(202,95,73,.9); }
.hero-card::before { content:"At a glance"; display:block; margin-bottom:1.4rem; color:#c5d4e8; font-size:.7rem; font-weight:850; letter-spacing:.15em; text-transform:uppercase; }
.hero-card strong { display:block; color:var(--cream); font-size:1.25rem; }
.hero-card dl { margin:1.1rem 0 0; }
.hero-card dt { color:#c4d0df; font-size:.82rem; }
.hero-card dd { margin:0 0 .85rem; color:var(--cream); font-weight:760; }
/* Override the browser-library main gutter so the home hero joins the masthead. */
main#content:not(.article) { margin:0; padding:0; }
main.article { max-width:980px; padding-bottom:5rem; }
.page-head { position:relative; margin-top:3rem; padding:3.2rem 0 2.3rem; border-top:5px solid var(--ink); border-bottom:1px solid var(--rule); }
.page-head::after { content:""; position:absolute; bottom:-1px; left:0; width:7rem; height:4px; background:var(--accent); }
.page-head h1 { font-size:clamp(2.35rem,5.3vw,3.8rem); }
.updated { color:#465772; font-size:.9rem; }
.band { padding:2.5rem 0 3.25rem; }
.band.soft { background:var(--paper-deep); border-top:1px solid var(--rule); border-bottom:1px solid var(--rule); }
.cards { display:grid; grid-template-columns:repeat(3,1fr); gap:1.15rem; }
.card { min-height:100%; border:1px solid var(--rule); border-top:5px solid var(--blue); border-radius:0; background:var(--cream); padding:1.35rem; box-shadow:7px 7px 0 rgba(24,34,51,.09); }
.card:nth-child(2) { border-top-color:var(--accent); }
.card:nth-child(3) { border-top-color:var(--ink); }
.card h3 { margin:.2rem 0 .55rem; }
.card p { color:#3e516e; font-size:.95rem; }
.metric { color:var(--accent-dark); font-size:1.8rem; font-weight:880; line-height:1; }
.steps { display:grid; grid-template-columns:repeat(3,1fr); gap:1.4rem; max-width:none; padding:0; list-style:none; counter-reset:steps; }
.steps li { position:relative; padding:.2rem 0 0 3rem; counter-increment:steps; }
.steps li::before { content:counter(steps,decimal-leading-zero); position:absolute; top:0; left:0; color:var(--accent); font-size:1.25rem; font-weight:850; letter-spacing:-.04em; }
.steps strong { display:block; color:var(--ink); }
table { width:100%; margin:1.55rem 0; border-collapse:collapse; background:var(--cream); font-size:.94rem; }
th,td { border-bottom:1px solid var(--rule); padding:.85rem .9rem; text-align:left; vertical-align:top; }
th { background:var(--ink); color:var(--cream); font-size:.78rem; letter-spacing:.06em; text-transform:uppercase; }
ul,ol { max-width:880px; padding-left:1.25rem; }
li { margin:.4rem 0; }
.notice { max-width:900px; margin:1.8rem 0; border-left:5px solid var(--accent); background:#f9e8df; padding:1.15rem 1.25rem; }
.notice p:last-child { margin-bottom:0; }
.source-list { font-size:.94rem; }
.related { margin-top:3.5rem; padding-top:.4rem; border-top:1px solid var(--rule); }
.related-links { display:flex; flex-wrap:wrap; gap:.7rem 1.2rem; }
.check-panel { max-width:850px; margin:2rem 0; border:1px solid var(--ink); border-left:7px solid var(--accent); border-radius:0; background:var(--cream); padding:2rem; box-shadow:9px 9px 0 rgba(24,34,51,.11); }
.check-panel h2 { margin-top:.3rem; }
.fine { color:#4c5d75; font-size:.88rem; }
footer { background:var(--night); color:#e6e5df; padding:3rem 0; }
footer p,footer strong { color:#e6e5df; }
footer .footer-row { display:flex; flex-wrap:wrap; justify-content:space-between; gap:1.2rem; }
footer a { color:#e5b1a3; } footer a:hover { color:var(--cream); }
footer p { margin:0; font-size:.9rem; }
@media (max-width:780px) { .shell { padding:0 1.15rem; } .nav { min-height:65px; } .brand::after { display:none; } nav { gap:.4rem; } nav a:not(.button) { display:none; } .hero { padding:4.1rem 0 3.4rem; } .hero-grid,.cards,.steps { grid-template-columns:1fr; gap:1rem; } .hero-card { margin-top:1rem; box-shadow:7px 7px 0 rgba(202,95,73,.9); } .page-head { margin-top:1.5rem; padding-top:2.4rem; } h2 { margin-top:2.8rem; } }