/*
Theme Name: 5G SIM Field Guide
Theme URI: https://www.5gsim.com/
Author: 5G SIM
Description: Lightweight editorial theme for 5gsim.com. Plain-English UK 5G guides, SIM-card design language, answer-first layout, JSON-LD, table of contents, author identity. No page builder, no jQuery.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GPL-2.0-or-later
Text Domain: fivegsim
*/

:root{
  --ink:#0d1b2a;
  --ink-2:#23344a;
  --paper:#f6f5f1;
  --card:#ffffff;
  --line:#e2ded4;
  --muted:#5a6573;
  --accent:#0b8a6c;
  --accent-ink:#ffffff;
  --accent-soft:#e3f3ee;
  --amber:#d9902a;
  --amber-soft:#fbf0de;
  --chip:#c8a24a;
  --code-bg:#eef0f2;
  --radius:10px;
  --notch:16px;
  --wrap:1160px;
  --read:720px;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:"Iowan Old Style","Charter","Bitstream Charter","Sitka Text",Cambria,Georgia,serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --ink:#e9edf2;--ink-2:#c9d2dc;--paper:#0e141b;--card:#151d26;--line:#26313d;--muted:#9aa6b3;
    --accent:#2fc49d;--accent-ink:#06231b;--accent-soft:#13332b;--amber:#f0b25a;--amber-soft:#30260f;--chip:#d8b25a;--code-bg:#1c2632;
  }
}
:root[data-theme="dark"]{
  --ink:#e9edf2;--ink-2:#c9d2dc;--paper:#0e141b;--card:#151d26;--line:#26313d;--muted:#9aa6b3;
  --accent:#2fc49d;--accent-ink:#06231b;--accent-soft:#13332b;--amber:#f0b25a;--amber-soft:#30260f;--chip:#d8b25a;--code-bg:#1c2632;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:18px/1.65 var(--serif);text-rendering:optimizeLegibility}
img,svg,video,iframe{max-width:100%;height:auto}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
h1,h2,h3,h4{font-family:var(--sans);line-height:1.2;letter-spacing:-.01em;color:var(--ink);margin:1.6em 0 .5em}
h1{font-size:clamp(2rem,4.2vw,3rem);margin-top:0}
h2{font-size:clamp(1.4rem,2.6vw,1.85rem)}
h3{font-size:1.2rem}
p,ul,ol,dl,table,blockquote,pre{margin:0 0 1.1em}
code,kbd,pre{font-family:var(--mono);font-size:.88em}
code{background:var(--code-bg);padding:.1em .35em;border-radius:4px}
pre{background:var(--code-bg);padding:1em;border-radius:var(--radius);overflow:auto}
pre code{background:none;padding:0}
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;z-index:999;background:var(--card);padding:.6em 1em;border-radius:6px}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 16px}
.read{max-width:var(--read)}

/* ---------- header ---------- */
.site-header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.site-header .wrap{display:flex;align-items:center;gap:20px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--sans)}
.brand svg{width:34px;height:42px;flex:none}
.brand-name{font-weight:800;font-size:1.25rem;letter-spacing:-.02em;line-height:1}
.brand-tag{display:block;font:500 .68rem/1.2 var(--mono);color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-top:3px}
.nav{margin-left:auto}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
.nav a{display:block;padding:.45em .7em;border-radius:6px;font:600 .9rem/1.2 var(--sans);color:var(--ink-2);text-decoration:none}
.nav a:hover,.nav .current-menu-item>a,.nav .current_page_item>a{background:var(--accent-soft);color:var(--ink)}
.nav .sub-menu{display:none}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:8px;padding:.4em .7em;font:600 .85rem var(--sans);color:var(--ink)}
@media (max-width:900px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--card);border-bottom:1px solid var(--line);padding:8px 16px 16px}
  .nav.is-open{display:block}
  .nav ul{flex-direction:column}
  .nav a{padding:.7em .5em}
}

/* ---------- SIM design language ---------- */
.sim{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);clip-path:polygon(var(--notch) 0,100% 0,100% 100%,0 100%,0 var(--notch));position:relative}
.sim-label{font:600 .7rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.chip{display:inline-block;width:30px;height:22px;border-radius:4px;background:linear-gradient(135deg,var(--chip),#e9cf8a 50%,var(--chip));position:relative;flex:none}
.chip::before,.chip::after{content:"";position:absolute;inset:6px 0;border-top:1px solid rgba(0,0,0,.25);border-bottom:1px solid rgba(0,0,0,.25)}
.chip::after{inset:0 10px;border:0;border-left:1px solid rgba(0,0,0,.25);border-right:1px solid rgba(0,0,0,.25)}
.waves{background-image:radial-gradient(circle at 100% 0,transparent 0 60px,var(--line) 61px 62px,transparent 63px 100px,var(--line) 101px 102px,transparent 103px 140px,var(--line) 141px 142px,transparent 143px)}

/* ---------- hero ---------- */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.35fr 1fr;gap:40px;align-items:center}
.hero h1{margin-bottom:.35em}
.hero .lede{font-size:1.2rem;color:var(--ink-2);max-width:36em}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:1.4em}
.btn{display:inline-block;font:700 .95rem/1 var(--sans);padding:.85em 1.2em;border-radius:8px;text-decoration:none;border:1px solid var(--accent)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-ghost{color:var(--accent);background:transparent}
.hero-card{padding:22px 22px 18px}
.hero-card h2{font-size:1.05rem;margin:.2em 0 .8em}
.hero-card .row{display:flex;justify-content:space-between;gap:12px;padding:.55em 0;border-top:1px dashed var(--line);font:500 .92rem/1.4 var(--sans)}
.hero-card .row span:last-child{font-family:var(--mono);font-size:.8rem;color:var(--muted);text-align:right}
.hero-card .foot{font:.78rem/1.4 var(--sans);color:var(--muted);margin-top:.8em}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}}

/* ---------- sections / cards ---------- */
.section{padding:48px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
.section-head h2{margin:0}
.section-head a{font:600 .9rem var(--sans)}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}
.path-grid{display:grid;gap:18px;grid-template-columns:repeat(3,1fr)}
@media (max-width:860px){.path-grid{grid-template-columns:1fr}}
.card{padding:20px 20px 18px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:inherit;height:100%}
a.card:hover{border-color:var(--accent)}
.card h3{margin:0;font-size:1.08rem}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--accent)}
.card p{margin:0;font-size:.95rem;color:var(--ink-2);line-height:1.55}
.card .meta{margin-top:auto;padding-top:8px}
.card-thumb{margin:-20px -20px 6px;aspect-ratio:16/9;overflow:hidden;background:var(--code-bg)}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.path .sim-label{color:var(--accent)}
.path ul{margin:.4em 0 0;padding-left:1.1em;font-size:.95rem}

.meta{font:500 .8rem/1.4 var(--sans);color:var(--muted)}
.meta a{color:var(--muted)}
.tag{display:inline-block;font:600 .7rem/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--accent);text-decoration:none}

/* ---------- article ---------- */
.article-head{padding:40px 0 24px;border-bottom:1px solid var(--line);background:var(--card)}
.crumbs{font:500 .82rem/1.4 var(--sans);color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}
.crumbs span[aria-hidden]{margin:0 .4em}
.byline{display:flex;align-items:center;gap:12px;margin-top:18px;font:500 .88rem/1.4 var(--sans);color:var(--muted)}
.byline .avatar{width:40px;height:40px;border-radius:50%;flex:none}
.byline strong{color:var(--ink)}
.article-layout{display:grid;grid-template-columns:minmax(0,var(--read)) 260px;gap:48px;padding:32px 0 56px;justify-content:center}
@media (max-width:1040px){.article-layout{grid-template-columns:minmax(0,1fr)}.article-aside{display:none}}
.article-aside .sticky{position:sticky;top:90px}
.entry-content>*:first-child{margin-top:0}
.entry-content img{border-radius:8px;max-height:560px;width:auto;object-fit:contain}
.featured img{display:block;max-height:460px;width:auto;margin:0 auto;border-radius:8px}
.entry-content table{width:100%;border-collapse:collapse;font:.92rem/1.45 var(--sans);display:block;overflow-x:auto}
.entry-content th,.entry-content td{border-bottom:1px solid var(--line);padding:.6em .7em;text-align:left;vertical-align:top}
.entry-content th{background:var(--code-bg);font-weight:700}
.entry-content blockquote{border-left:3px solid var(--accent);padding:.2em 0 .2em 1em;color:var(--ink-2);font-style:italic}
.entry-content ul,.entry-content ol{padding-left:1.25em}
.entry-content li{margin-bottom:.35em}
.entry-content h2{scroll-margin-top:90px}
.entry-content .alignwide,.entry-content .alignfull{max-width:100%}

.answer{padding:18px 20px;margin:0 0 28px;background:var(--accent-soft);border-color:transparent}
.answer .sim-label{color:var(--accent);display:flex;align-items:center;gap:8px;margin-bottom:8px}
.answer p{margin:0;font-size:1.05rem}
.facts{padding:18px 20px;margin:0 0 28px}
.facts dl{display:grid;grid-template-columns:minmax(120px,max-content) 1fr;gap:6px 18px;margin:8px 0 0;font:.95rem/1.45 var(--sans)}
.facts dt{font-weight:700}
.facts dd{margin:0;color:var(--ink-2)}
.note{padding:14px 18px;background:var(--amber-soft);border-left:3px solid var(--amber);border-radius:6px;font:.95rem/1.55 var(--sans);margin:0 0 1.2em}

.toc{padding:16px 18px;font:.88rem/1.45 var(--sans)}
.toc ol{margin:.6em 0 0;padding-left:1.1em}
.toc li{margin:.3em 0}
.toc a{color:var(--ink-2);text-decoration:none}
.toc a:hover,.toc a.is-active{color:var(--accent);text-decoration:underline}
.toc-inline{margin:0 0 28px}
@media (min-width:1041px){.toc-inline{display:none}}

.faq{margin-top:40px}
.faq details{border-top:1px solid var(--line);padding:.9em 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;font:700 1rem/1.4 var(--sans);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";display:inline-block;width:1.2em;color:var(--accent)}
.faq details[open] summary::before{content:"-"}
.faq details p{margin:.6em 0 0 1.2em}

.author-box{display:flex;gap:18px;padding:22px;margin-top:44px;align-items:flex-start}
.author-box .avatar{width:72px;height:72px;border-radius:50%;flex:none}
.author-box h2{margin:0 0 .2em;font-size:1.1rem}
.author-box p{margin:.3em 0 0;font-size:.97rem}
.author-role{font:600 .72rem/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.reviewed{display:inline-flex;align-items:center;gap:6px}
.reviewed::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent)}

.related{border-top:1px solid var(--line);padding:40px 0;background:var(--card)}

/* ---------- archive ---------- */
.archive-head{padding:40px 0 24px;border-bottom:1px solid var(--line)}
.archive-head p{color:var(--ink-2);max-width:42em;margin:0}
.pagination{display:flex;gap:6px;flex-wrap:wrap;margin-top:32px;font:600 .9rem var(--sans)}
.pagination .page-numbers{padding:.5em .85em;border:1px solid var(--line);border-radius:6px;text-decoration:none;color:var(--ink-2);background:var(--card)}
.pagination .current{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}

.search-form{display:flex;gap:8px;max-width:520px}
.search-form input[type=search]{flex:1;font:1rem var(--sans);padding:.7em .9em;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink)}
.search-form button{font:700 .9rem var(--sans);padding:0 1.1em;border-radius:8px;border:0;background:var(--accent);color:var(--accent-ink);cursor:pointer}

/* ---------- comments ---------- */
.comments{margin-top:44px;font-family:var(--sans);font-size:.95rem}
.comments ol{list-style:none;padding:0}
.comments .comment-body{border-top:1px solid var(--line);padding:1em 0}
.comments textarea,.comments input[type=text],.comments input[type=email],.comments input[type=url]{width:100%;padding:.6em;border:1px solid var(--line);border-radius:6px;background:var(--card);color:var(--ink);font:inherit}
.comments .submit{font:700 .9rem var(--sans);padding:.7em 1.1em;border-radius:8px;border:0;background:var(--accent);color:var(--accent-ink);cursor:pointer}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#c8d0da;padding:48px 0 28px;font:.92rem/1.6 var(--sans)}
:root[data-theme="dark"] .site-footer{background:#080c11}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .site-footer{background:#080c11}}
.site-footer a{color:#e6ecf2}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr}}
.site-footer h2{color:#fff;font-size:.8rem;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;margin:0 0 .8em}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.3em 0}
.foot-base{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.82rem;color:#93a0ae}
.theme-toggle{background:none;border:1px solid rgba(255,255,255,.25);color:#e6ecf2;border-radius:6px;padding:.3em .7em;font:600 .78rem var(--sans);cursor:pointer}

/* ---------- WP core ---------- */
.wp-caption,figure{margin:0 0 1.2em}
.wp-caption-text,figcaption{font:.82rem/1.4 var(--sans);color:var(--muted);margin-top:.4em}
.alignleft{float:left;margin:0 1.2em 1em 0}
.alignright{float:right;margin:0 0 1em 1.2em}
.aligncenter{display:block;margin-left:auto;margin-right:auto}
.sticky-label{color:var(--amber)}
@media (max-width:600px){.alignleft,.alignright{float:none;margin:0 0 1em}}
@media print{.site-header,.site-footer,.article-aside,.related,.comments{display:none}body{background:#fff}}