/*
Theme Name: 4G SIM Fieldbook
Theme URI: https://www.4gsim.co.uk/
Author: Nick Appleby
Description: Lightweight theme for 4gsim.co.uk. Plain-English guides to 4G data SIMs, UK networks and cellular routers. No page builder, no jQuery dependency, schema and table of contents built in.
Version: 1.0.0
Requires at least: 6.2
Requires PHP: 7.4
License: GPLv2 or later
Text Domain: foursim
*/

:root{
  --paper:#f5f2ea;--paper-2:#ece7db;--card:#fffdf8;
  --ink:#18201d;--ink-2:#3d4844;--muted:#69736e;--line:#d8d0c0;
  --accent:#cf4a29;--accent-ink:#a5361a;--accent-soft:#f8e3da;
  --moss:#2e6a4f;--moss-soft:#e1ece4;--amber:#e3a22f;
  --radius:10px;--wrap:1160px;--measure:70ch;
  --sans:"Schibsted Grotesk",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.65}
img,svg,video{max-width:100%;height:auto}
a{color:var(--accent-ink);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
h1,h2,h3,h4{line-height:1.15;letter-spacing:-.015em;margin:1.6em 0 .5em;font-weight:800}
h1{font-size:clamp(2rem,4.2vw,3.1rem)}
h2{font-size:clamp(1.45rem,2.6vw,1.9rem)}
h3{font-size:1.22rem}
p,ul,ol,table,figure,blockquote,pre{margin:0 0 1.15em}
code,pre,kbd{font-family:var(--mono);font-size:.88em}
code{background:var(--paper-2);padding:.1em .35em;border-radius:4px}
pre{background:var(--ink);color:#f3efe6;padding:16px 18px;border-radius:var(--radius);overflow:auto}
pre code{background:none;padding:0;color:inherit}
hr{border:0;border-top:1px solid var(--line);margin:2.5em 0}
.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}
.skip-link:focus{position:fixed;top:8px;left:8px;width:auto;height:auto;clip:auto;background:var(--ink);color:#fff;padding:10px 14px;z-index:999;border-radius:6px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.mono{font-family:var(--mono)}
.eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-ink);font-weight:500}

/* Header */
.topline{background:var(--ink);color:#d9d4c8;font-family:var(--mono);font-size:.74rem;letter-spacing:.03em}
.topline .wrap{display:flex;gap:18px;justify-content:space-between;align-items:center;min-height:32px}
.topline a{color:#fff;text-decoration:none}
.topline span:last-child{display:none}
@media (min-width:720px){.topline span:last-child{display:inline}}
.site-header{position:sticky;top:0;z-index:50;background:rgba(245,242,234,.94);backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:20px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand svg{width:34px;height:30px;flex:none}
.brand b{font-size:1.32rem;font-weight:800;letter-spacing:-.02em}
.brand small{font-family:var(--mono);font-size:.72rem;color:var(--muted);font-weight:400}
.nav-toggle{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--card);border-radius:8px;padding:8px 12px;font:600 .9rem var(--sans);color:var(--ink);cursor:pointer}
.primary-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 20px 18px}
.primary-nav.is-open{display:block;max-height:calc(100vh - 110px);overflow:auto}
.primary-nav ul{list-style:none;margin:0;padding:0}
.primary-nav a{display:block;padding:10px 4px;color:var(--ink);text-decoration:none;font-weight:600;border-bottom:1px solid var(--line)}
.primary-nav .sub-menu a{padding-left:18px;font-weight:400}
.btn.header-cta{display:none}
.nav-toggle svg{width:18px;height:14px;flex:none}
.brand span{white-space:nowrap}
.topline span:first-child{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
@media (min-width:980px){
  .nav-toggle{display:none}
  .primary-nav{display:block;position:static;background:none;border:0;padding:0}
  .primary-nav>ul{display:flex;gap:4px}
  .primary-nav li{position:relative}
  .primary-nav a{border:0;padding:8px 10px;border-radius:6px;font-size:.95rem}
  .primary-nav a:hover,.primary-nav .current-menu-item>a,.primary-nav .current-menu-ancestor>a{background:var(--paper-2)}
  .primary-nav .sub-menu{display:none;position:absolute;left:0;top:100%;min-width:260px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:8px;box-shadow:0 12px 30px rgba(24,32,29,.12)}
  .primary-nav li:hover>.sub-menu,.primary-nav li:focus-within>.sub-menu{display:block}
  .primary-nav .sub-menu a{padding:8px 10px}
  .btn.header-cta{display:inline-flex}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:999px;font-weight:700;font-size:.98rem;text-decoration:none;border:2px solid var(--ink);color:var(--ink);background:transparent;cursor:pointer;line-height:1.2}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-ink);border-color:var(--accent-ink);color:#fff}
.btn-small{padding:8px 14px;font-size:.88rem}

/* Hero */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;gap:40px;align-items:center}
@media (min-width:900px){.hero-grid{grid-template-columns:1.15fr .85fr}}
.hero h1{margin:.3em 0 .4em;max-width:16ch}
.hero .lede{font-size:1.18rem;color:var(--ink-2);max-width:56ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.simcard{position:relative;background:var(--card);border:1px solid var(--line);border-radius:22px 22px 22px 22px;padding:26px;box-shadow:0 22px 50px -24px rgba(24,32,29,.35)}
.simcard::before{content:"";position:absolute;top:-1px;right:-1px;width:64px;height:64px;background:var(--paper);border-left:1px solid var(--line);border-bottom:1px solid var(--line);border-bottom-left-radius:14px;border-top-right-radius:22px}
.simcard .chip{width:74px;height:56px;border-radius:10px;background:linear-gradient(135deg,#e9c46a,#c9962f);display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr 1fr;gap:3px;padding:6px;margin-bottom:18px}
.simcard .chip i{background:rgba(255,255,255,.35);border-radius:3px}
.netlist{list-style:none;margin:0;padding:0;font-family:var(--mono);font-size:.86rem}
.netlist li{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-top:1px dashed var(--line)}
.netlist li:first-child{border-top:0}
.netlist b{font-family:var(--sans);font-size:.98rem}
.tag{display:inline-block;font-family:var(--mono);font-size:.72rem;padding:2px 8px;border-radius:999px;background:var(--moss-soft);color:var(--moss);white-space:nowrap}
.tag.off{background:var(--accent-soft);color:var(--accent-ink)}

/* Sections */
.section{padding:56px 0}
.section-alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:12px;margin-bottom:24px}
.section-head h2{margin:.2em 0 0}
.grid{display:grid;gap:18px}
@media (min-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}
.card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--ink);transition:transform .15s,box-shadow .15s}
a.card:hover{transform:translateY(-2px);box-shadow:0 14px 30px -18px rgba(24,32,29,.4);color:var(--ink)}
.card h3{margin:.35em 0 .35em;font-size:1.12rem}
.card p{color:var(--ink-2);font-size:.95rem;margin:0}
.card .meta{margin-top:auto;padding-top:14px;font-family:var(--mono);font-size:.76rem;color:var(--muted)}
.card-thumb{margin:-20px -20px 14px;aspect-ratio:16/9;overflow:hidden;border-radius:var(--radius) var(--radius) 0 0;background:var(--paper-2)}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.net-card{border-top:5px solid var(--ink)}
.net-card.ee{border-top-color:#1b9e8f}.net-card.o2{border-top-color:#1f4fa3}.net-card.vodafone{border-top-color:#d6292a}.net-card.three{border-top-color:#5b2c83}

/* Article layout */
.page-head{padding:40px 0 18px}
.crumbs{font-family:var(--mono);font-size:.78rem;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}
.crumbs span[aria-hidden]{margin:0 6px}
.page-head h1{margin:.25em 0 .35em;max-width:24ch}
.byline{display:flex;flex-wrap:wrap;gap:6px 16px;font-family:var(--mono);font-size:.8rem;color:var(--muted)}
.byline a{color:var(--ink-2)}
.layout{display:grid;gap:36px;padding-bottom:64px}
@media (min-width:1040px){.layout.has-toc{grid-template-columns:minmax(0,1fr) 270px}}
.entry{max-width:var(--measure);min-width:0}
.entry>*:first-child{margin-top:0}
.entry h2{padding-top:.4em;border-top:1px solid var(--line)}
.entry img{border-radius:8px}
.entry figure{margin-left:0;margin-right:0}
.entry figcaption{font-size:.85rem;color:var(--muted)}
.entry blockquote{border-left:4px solid var(--accent);margin-left:0;padding:4px 0 4px 18px;color:var(--ink-2)}
.entry ul li,.entry ol li{margin-bottom:.35em}
.entry .alignleft{float:left;margin:0 1em 1em 0}.entry .alignright{float:right;margin:0 0 1em 1em}.entry .aligncenter{display:block;margin:0 auto 1em}
.table-wrap{overflow-x:auto;margin:0 0 1.2em;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
.entry table{width:100%;border-collapse:collapse;font-size:.92rem;margin:0}
.entry th,.entry td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.entry th{background:var(--paper-2);font-weight:700}
.entry tr:last-child td{border-bottom:0}
.lede{font-size:1.15rem;color:var(--ink-2)}
.answer{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--moss);border-radius:var(--radius);padding:16px 18px;margin:0 0 1.4em}
.answer p:last-child{margin:0}
.answer strong:first-child{display:block;font-family:var(--mono);font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--moss);margin-bottom:4px}
.note{background:var(--accent-soft);border-radius:var(--radius);padding:14px 18px;margin:0 0 1.4em;font-size:.95rem}
.note p:last-child{margin:0}
.keypoints{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px 6px 18px;margin:0 0 1.4em}
.keypoints h2,.keypoints h3{margin:0 0 .5em;border:0;padding:0;font-size:1.05rem}
.archive-note{font-size:.92rem;background:var(--paper-2);border:1px dashed var(--line);border-radius:var(--radius);padding:12px 16px;margin-bottom:1.6em}
.archive-note p{margin:0}

.glossary{margin:0 0 1.4em}
.glossary dt{font-weight:800;font-size:1.05rem;margin-top:1.1em;padding-top:.8em;border-top:1px solid var(--line)}
.glossary dt:first-child{border-top:0;margin-top:0;padding-top:0}
.glossary dd{margin:.25em 0 0;color:var(--ink-2)}

/* TOC */
.toc{position:relative}
.toc-inner{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
@media (min-width:1040px){.toc-inner{position:sticky;top:96px;max-height:calc(100vh - 120px);overflow:auto}}
.toc summary{cursor:pointer}
.toc details:not([open]) .toc-title{margin:0}
.toc-title{font-family:var(--mono);font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t;margin:0}
.toc a{display:flex;gap:8px;padding:6px 0;color:var(--ink-2);text-decoration:none;font-size:.9rem;line-height:1.35;border-top:1px solid var(--paper-2)}
.toc a::before{content:counter(t,decimal-leading-zero);font-family:var(--mono);font-size:.72rem;color:var(--accent-ink);padding-top:2px}
.toc a.is-active,.toc a:hover{color:var(--ink);font-weight:600}
@media (max-width:1039px){.toc{order:-1}.toc details:not([open]) ol{display:none}}

/* Author, related, CTA */
.author-box{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:start;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:36px 0 0;max-width:var(--measure)}
.author-box .avatar{width:64px;height:64px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-weight:800;font-size:1.2rem;overflow:hidden}
.author-box .avatar img{width:100%;height:100%;object-fit:cover}
.author-box h2{font-size:1.05rem;margin:0 0 4px;border:0;padding:0}
.author-box p{margin:0;font-size:.95rem;color:var(--ink-2)}
.cta-band{background:var(--ink);color:#efe9dc;border-radius:16px;padding:28px;display:grid;gap:18px;align-items:center;margin:40px 0 0}
@media (min-width:760px){.cta-band{grid-template-columns:1fr auto}}
.cta-band h2{color:#fff;margin:0 0 6px;border:0;padding:0;font-size:1.4rem}
.cta-band p{margin:0;color:#cfc8b8}
.cta-band a.btn{border-color:#fff;color:#fff}
.cta-band a.btn-accent{border-color:var(--accent)}
.cta-band .mono a{color:#fff}
.related{border-top:1px solid var(--line);padding:40px 0 64px}

/* Lists, pagination, search */
.post-list{display:grid;gap:14px}
.list-item{display:grid;gap:4px;padding:18px 0;border-bottom:1px solid var(--line)}
.list-item h2{font-size:1.2rem;margin:0}
.list-item h2 a{color:var(--ink);text-decoration:none}
.list-item h2 a:hover{color:var(--accent-ink)}
.list-item p{margin:0;color:var(--ink-2);font-size:.96rem}
.list-item .meta{font-family:var(--mono);font-size:.76rem;color:var(--muted)}
.pagination{display:flex;flex-wrap:wrap;gap:6px;margin:30px 0}
.pagination .page-numbers{padding:8px 13px;border:1px solid var(--line);border-radius:8px;text-decoration:none;color:var(--ink);background:var(--card);font-family:var(--mono);font-size:.85rem}
.pagination .current{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.search-form{display:flex;gap:8px;max-width:520px}
.search-form input[type=search]{flex:1;min-width:0;padding:12px 14px;border:1px solid var(--line);border-radius:999px;font:inherit;background:var(--card)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 0;padding:0;list-style:none}
.chips a{display:inline-block;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);text-decoration:none;color:var(--ink-2);font-size:.88rem}
.chips a:hover{border-color:var(--ink);color:var(--ink)}

/* Author strip on home */
.author-strip{display:grid;gap:24px;align-items:center}
@media (min-width:860px){.author-strip{grid-template-columns:auto 1fr auto}}
.author-strip .avatar{width:88px;height:88px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-weight:800;font-size:1.6rem;overflow:hidden}
.author-strip .avatar img{width:100%;height:100%;object-fit:cover}
.author-strip h2{margin:.2em 0 .3em}
.author-strip p{margin:0;color:var(--ink-2);max-width:62ch}

/* Footer */
.site-footer{background:var(--ink);color:#cfc8b8;padding:48px 0 28px;font-size:.94rem}
.site-footer a{color:#fff;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-grid{display:grid;gap:28px}
@media (min-width:860px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.site-footer h2{color:#fff;font-size:.82rem;font-family:var(--mono);font-weight:500;letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:0 0 8px}
.footer-base{margin-top:36px;padding-top:18px;border-top:1px solid #34403b;display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;font-family:var(--mono);font-size:.76rem;color:#99a39e}

/* Back to top */
.to-top{position:fixed;right:16px;bottom:16px;width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--ink);display:grid;place-items:center;opacity:0;pointer-events:none;transition:opacity .2s;cursor:pointer}
.to-top.is-visible{opacity:1;pointer-events:auto}

/* Legacy content from the old theme */
.entry .one_half,.entry .one_third{width:100%}
.entry iframe{max-width:100%}
.wp-block-image img{height:auto}

@media print{.site-header,.topline,.site-footer,.toc,.cta-band,.related,.to-top{display:none}body{background:#fff}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}