/*
Theme Name: Audience Interest
Theme URI: https://audienceinterest.com
Author: Audience Interest
Description: A reference publication theme for AI and technology writing. System fonts only, server-rendered, structured for citation. Built for Core Web Vitals and machine readability.
Version: 1.0.0
Requires at least: 6.5
Requires PHP: 8.0
License: GNU General Public License v2 or later
Text Domain: audience-interest
Tags: blog, news, one-column, custom-colors, block-styles, wide-blocks, accessibility-ready
*/

/* ============================================================
   TOKENS
   ============================================================ */
:root{
  --paper:#FBFBFD; --surface:#FFFFFF; --sunk:#F4F5F8;
  --ink:#11141B; --ink-soft:#4C5563; --ink-faint:#7B8494;
  --rule:#E3E6EC; --rule-soft:#EEF0F4;
  --accent:#1D3FC7; --accent-soft:#E8ECFB;
  --signal:#9A5B00; --signal-soft:#FBF0DE;
  --ok:#1B6B4A;

  --serif:Charter,"Bitstream Charter","Iowan Old Style","Source Serif 4",Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Code","JetBrains Mono",Menlo,Consolas,monospace;

  --measure:68ch;
  --wrap:1120px;
  --gutter:clamp(16px,4vw,28px);
  --radius:4px;
}

@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0C0F14; --surface:#12161D; --sunk:#171C25;
    --ink:#E9EDF4; --ink-soft:#A3ACBB; --ink-faint:#79828F;
    --rule:#242B36; --rule-soft:#1B2129;
    --accent:#7E9BFF; --accent-soft:#18213A;
    --signal:#DFA44B; --signal-soft:#2A2213;
    --ok:#5FBE92;
  }
}
:root[data-theme="dark"]{
  --paper:#0C0F14; --surface:#12161D; --sunk:#171C25;
  --ink:#E9EDF4; --ink-soft:#A3ACBB; --ink-faint:#79828F;
  --rule:#242B36; --rule-soft:#1B2129;
  --accent:#7E9BFF; --accent-soft:#18213A;
  --signal:#DFA44B; --signal-soft:#2A2213;
  --ok:#5FBE92;
}

/* ============================================================
   RESET + BASE
   ============================================================ */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img,video,svg{max-width:100%; height:auto; display:block;}
a{color:var(--accent); text-underline-offset:2px;}
a:hover{text-decoration:underline;}
button{font:inherit; cursor:pointer;}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px; border-radius:2px;}

h1,h2,h3,h4,h5,h6{
  font-family:var(--serif); font-weight:600; line-height:1.18;
  letter-spacing:-.014em; margin:0; text-wrap:balance;
}

.wrap{max-width:var(--wrap); margin-inline:auto; padding-inline:var(--gutter);}
.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; z-index:999; width:auto; height:auto;
  clip:auto; background:var(--ink); color:var(--paper); padding:10px 16px; border-radius:3px;
}

/* ============================================================
   SHARED ATOMS
   ============================================================ */
.eyebrow{
  font-family:var(--mono); font-size:11px; letter-spacing:.13em;
  text-transform:uppercase; color:var(--ink-faint);
}

.tag{
  display:inline-block; font-family:var(--mono); font-size:10px; letter-spacing:.11em;
  text-transform:uppercase; padding:3px 7px; border-radius:2px; text-decoration:none;
  background:var(--sunk); color:var(--ink-soft); border:1px solid var(--rule);
}
.tag:hover{text-decoration:none; border-color:var(--accent); color:var(--accent);}
.tag--accent{background:var(--accent-soft); color:var(--accent); border-color:transparent;}
.tag--signal{background:var(--signal-soft); color:var(--signal); border-color:transparent;}

/* evidence header — the signature device */
.evidence{
  display:flex; flex-wrap:wrap; font-family:var(--mono); font-size:11px;
  color:var(--ink-faint); border-top:1px solid var(--rule-soft); padding-top:10px;
  margin:0; gap:0;
}
.evidence > span{padding-right:12px; margin-right:12px; border-right:1px solid var(--rule);}
.evidence > span:last-child{border-right:0; margin-right:0; padding-right:0;}
.evidence b{color:var(--ink-soft); font-weight:600;}
.evidence time{color:inherit;}

.thumb{
  aspect-ratio:16/9; width:100%; object-fit:cover;
  background:var(--sunk); border:1px solid var(--rule); border-radius:var(--radius);
}
.thumb--ph{
  position:relative; overflow:hidden;
  background:linear-gradient(135deg,var(--sunk),var(--rule-soft));
}
.thumb--ph::after{
  content:""; position:absolute; inset:0; opacity:.16;
  background-image:radial-gradient(circle at 1px 1px,var(--ink-faint) .6px,transparent 0);
  background-size:11px 11px;
}

.section-head{
  display:flex; align-items:baseline; justify-content:space-between; gap:12px;
  border-bottom:1px solid var(--ink); padding-bottom:9px; margin-bottom:22px;
}
.section-head .t{font-family:var(--mono); font-size:11px; letter-spacing:.13em; text-transform:uppercase;}
.section-head .a{font-family:var(--mono); font-size:10.5px; text-decoration:none;}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  border-bottom:1px solid var(--rule); background:var(--surface);
  position:sticky; top:0; z-index:50;
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  min-height:60px;
}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--ink); flex:none;}
.brand:hover{text-decoration:none;}
.brand-tile{flex:none; display:block;}
.brand-tile-bg{fill:var(--ink);}
.brand-tile-a{fill:var(--paper);}
.brand-tile-i{fill:var(--accent);}
/* On dark grounds the accent needs to stay bright against near-black. */
:root[data-theme="dark"] .brand-tile-i{fill:#7E9BFF;}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .brand-tile-i{fill:#7E9BFF;}
}
.brand-name{font-family:var(--serif); font-size:18px; font-weight:600; white-space:nowrap;}
.brand-name small{display:block; font-family:var(--mono); font-size:9.5px; letter-spacing:.1em;
  text-transform:uppercase; color:var(--ink-faint); font-weight:400; margin-top:1px;}

.nav-main ul{display:flex; gap:22px; list-style:none; margin:0; padding:0;}
.nav-main a{color:var(--ink-soft); text-decoration:none; font-size:14.5px;}
.nav-main a:hover,.nav-main .current-menu-item > a{color:var(--accent); text-decoration:none;}

.header-tools{display:flex; align-items:center; gap:8px; flex:none;}
.icon-btn{
  background:none; border:1px solid var(--rule); border-radius:3px;
  width:34px; height:34px; display:grid; place-items:center; color:var(--ink-soft);
}
.icon-btn:hover{border-color:var(--accent); color:var(--accent);}
.icon-btn svg{width:16px; height:16px; fill:none; stroke:currentColor; stroke-width:1.8;}

.nav-toggle{display:none;}
@media (max-width:860px){
  .nav-main{
    display:none; position:absolute; left:0; right:0; top:100%;
    background:var(--surface); border-bottom:1px solid var(--rule); padding:8px var(--gutter) 16px;
  }
  .nav-main.open{display:block;}
  .nav-main ul{flex-direction:column; gap:0;}
  .nav-main li{border-bottom:1px solid var(--rule-soft);}
  .nav-main a{display:block; padding:12px 0; font-size:16px;}
  .nav-toggle{display:grid;}
  .brand-name{font-size:16px;}
}

/* ============================================================
   HOME
   ============================================================ */
.home-lead{display:grid; grid-template-columns:1.55fr 1fr; gap:38px; align-items:start; padding:34px 0;}
@media (max-width:860px){.home-lead{grid-template-columns:1fr; gap:30px; padding:24px 0;}}

.lead-title{font-size:clamp(28px,4.4vw,40px); margin:12px 0 12px;}
.lead-title a{color:inherit; text-decoration:none;}
.lead-title a:hover{color:var(--accent); text-decoration:none;}
.lead-dek{color:var(--ink-soft); font-size:17px; margin:0 0 16px; max-width:54ch;}
.lead-media{margin-bottom:14px;}

.rail-head{
  font-family:var(--mono); font-size:11px; letter-spacing:.13em; text-transform:uppercase;
  color:var(--ink-faint); padding-bottom:9px; border-bottom:1px solid var(--ink); margin-bottom:0;
}
.rail-item{padding:15px 0; border-bottom:1px solid var(--rule-soft);}
.rail-item:last-child{border-bottom:0;}
.rail-title{font-size:16.5px; line-height:1.28; margin:7px 0 6px;}
.rail-title a{color:inherit; text-decoration:none;}
.rail-title a:hover{color:var(--accent); text-decoration:none;}
.rail-meta{font-family:var(--mono); font-size:10.5px; color:var(--ink-faint);}

.stat-strip{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--rule);
  border-block:1px solid var(--rule);
}
@media (max-width:720px){.stat-strip{grid-template-columns:repeat(2,1fr);}}
.stat{background:var(--surface); padding:16px 18px;}
.stat .n{font-family:var(--mono); font-size:22px; letter-spacing:-.02em; font-variant-numeric:tabular-nums;}
.stat .l{font-family:var(--mono); font-size:10px; letter-spacing:.09em; text-transform:uppercase; color:var(--ink-faint); margin-top:3px;}

.cluster{padding:38px 0;}
.card-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:28px;}
@media (max-width:860px){.card-grid{grid-template-columns:repeat(2,1fr); gap:22px;}}
@media (max-width:560px){.card-grid{grid-template-columns:1fr;}}

.card-title{font-size:18px; line-height:1.26; margin:9px 0 7px;}
.card-title a{color:inherit; text-decoration:none;}
.card-title a:hover{color:var(--accent); text-decoration:none;}
.card-meta{font-family:var(--mono); font-size:10.5px; color:var(--ink-faint);}
.card-media{margin-bottom:10px;}

/* ============================================================
   ARTICLE
   ============================================================ */
.article-head{padding:32px 0 24px; border-bottom:1px solid var(--rule-soft);}
.article-title{font-size:clamp(30px,5vw,46px); margin:12px 0 14px; max-width:22ch;}
.article-dek{font-size:19px; color:var(--ink-soft); margin:0 0 20px; max-width:56ch;}

.article-layout{display:grid; grid-template-columns:190px minmax(0,1fr) 300px; gap:40px; padding:32px 0 56px; align-items:start;}
@media (max-width:1080px){.article-layout{grid-template-columns:180px minmax(0,1fr); gap:34px;}}
@media (max-width:860px){.article-layout{grid-template-columns:1fr; gap:26px;}}

.toc{position:sticky; top:78px; font-size:13.5px; align-self:start; max-height:calc(100vh - 100px); overflow-y:auto;}
@media (max-width:860px){
  .toc{position:static; max-height:none; border:1px solid var(--rule); border-radius:var(--radius); padding:14px 16px; background:var(--sunk);}
}
.toc .h{font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:10px;}
.toc ol{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px;}
.toc a{color:var(--ink-soft); text-decoration:none; display:block; padding-left:11px; border-left:2px solid var(--rule); line-height:1.4;}
.toc a:hover{color:var(--accent); text-decoration:none;}
.toc a.is-active{color:var(--accent); border-left-color:var(--accent); font-weight:600;}
.toc .lvl-3{padding-left:11px; font-size:12.5px;}
.toc .lvl-3 a{padding-left:22px;}

.article-aside{position:sticky; top:78px; align-self:start; display:flex; flex-direction:column; gap:22px;}
@media (max-width:1080px){.article-aside{display:none;}}

/* article body typography */
.entry-content{font-size:17.5px; line-height:1.72; max-width:var(--measure);}
.entry-content > *{margin-block:0 1.15em;}
.entry-content h2{font-size:28px; margin-top:1.9em; margin-bottom:.5em; scroll-margin-top:80px;}
.entry-content h3{font-size:21px; margin-top:1.7em; margin-bottom:.45em; scroll-margin-top:80px;}
.entry-content h4{font-size:18px; margin-top:1.5em; margin-bottom:.4em;}
.entry-content ul,.entry-content ol{padding-left:1.4em;}
.entry-content li{margin-bottom:.5em;}
.entry-content li::marker{color:var(--ink-faint);}
.entry-content img,.entry-content figure{border-radius:var(--radius);}
.entry-content figure{margin-inline:0;}
.entry-content figcaption{
  font-family:var(--mono); font-size:11.5px; color:var(--ink-faint);
  margin-top:8px; line-height:1.5;
}
.entry-content blockquote{
  margin-inline:0; padding:4px 0 4px 20px; border-left:3px solid var(--accent);
  font-family:var(--serif); font-size:20px; line-height:1.5; color:var(--ink-soft);
}
.entry-content code{
  font-family:var(--mono); font-size:.87em; background:var(--sunk);
  padding:2px 6px; border-radius:3px; border:1px solid var(--rule-soft);
}
.entry-content pre{
  background:var(--sunk); border:1px solid var(--rule); border-radius:var(--radius);
  padding:16px 18px; overflow-x:auto; font-size:13.5px; line-height:1.6;
}
.entry-content pre code{background:none; border:0; padding:0; font-size:inherit;}
.entry-content table{width:100%; border-collapse:collapse; font-size:15px;}
.entry-content thead th{
  font-family:var(--mono); font-size:11px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--ink-faint); border-bottom:1px solid var(--ink); text-align:left; padding:9px 12px;
}
.entry-content tbody td{border-bottom:1px solid var(--rule-soft); padding:10px 12px; vertical-align:top;}
.table-scroll{overflow-x:auto; margin-bottom:1.15em;}
.entry-content a{text-decoration:underline;}

/* key takeaways — highest-leverage citation block */
.takeaways{
  background:var(--sunk); border:1px solid var(--rule); border-radius:var(--radius);
  padding:18px 20px; margin:0 0 1.6em;
}
.takeaways .h{
  font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-faint); margin-bottom:11px;
}
.takeaways ul{margin:0; padding-left:18px; display:flex; flex-direction:column; gap:8px;}
.takeaways li{font-size:16px; line-height:1.55; margin:0;}

/* citation block */
.cite-box{
  border:1px solid var(--rule); border-left:3px solid var(--accent); border-radius:3px;
  padding:14px 17px; margin:2em 0; background:var(--surface);
}
.cite-box .h{font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:8px; display:flex; justify-content:space-between; align-items:center; gap:10px;}
.cite-box .copy{background:none; border:1px solid var(--rule); border-radius:2px; padding:3px 8px; font-family:var(--mono); font-size:10px; color:var(--ink-soft); text-transform:uppercase; letter-spacing:.08em;}
.cite-box .copy:hover{border-color:var(--accent); color:var(--accent);}
.cite-box code{
  font-family:var(--mono); font-size:12.5px; color:var(--ink-soft); line-height:1.7;
  display:block; word-break:break-word; background:none; border:0; padding:0;
}

/* sources / references */
.sources{margin:2.4em 0 0; padding-top:22px; border-top:1px solid var(--rule);}
.sources .h{font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:14px;}
.sources ol{padding-left:1.4em; font-size:14.5px; line-height:1.6;}
.sources li{margin-bottom:9px;}
.sources a{color:var(--accent); word-break:break-word;}

/* ad slots — reserved height protects CLS */
.ad-slot{
  display:grid; place-items:center; margin:2em auto; background:var(--sunk);
  border:1px dashed var(--rule); border-radius:3px;
  font-family:var(--mono); font-size:10px; letter-spacing:.11em; text-transform:uppercase; color:var(--ink-faint);
}
.ad-slot--inline{width:100%; max-width:336px; min-height:280px;}
.ad-slot--leader{width:100%; min-height:90px; max-width:728px;}
.ad-slot--rail{width:300px; min-height:250px; margin:0;}

/* author box */
.author-box{
  display:flex; gap:16px; align-items:flex-start; margin-top:2.4em; padding-top:22px;
  border-top:1px solid var(--rule);
}
.author-box img{width:52px; height:52px; border-radius:50%; flex:none;}
.author-box .n{font-family:var(--serif); font-size:17px; font-weight:600; margin-bottom:3px;}
.author-box .b{font-size:14.5px; color:var(--ink-soft); line-height:1.55; margin:0; max-width:60ch;}

/* related */
.related{padding:36px 0; border-top:1px solid var(--rule);}

/* newsletter */
.newsletter{
  border:1px solid var(--rule); border-radius:var(--radius); padding:22px 24px;
  background:var(--sunk);
}
.newsletter .t{font-family:var(--serif); font-size:20px; font-weight:600; margin:0 0 6px;}
.newsletter .d{font-size:14.5px; color:var(--ink-soft); margin:0 0 14px;}
.newsletter form{display:flex; gap:8px;}
@media (max-width:560px){.newsletter form{flex-direction:column;}}
.newsletter input[type=email]{
  flex:1; min-width:0; border:1px solid var(--rule); border-radius:3px; padding:10px 12px;
  font-family:var(--mono); font-size:13px; background:var(--surface); color:var(--ink);
}
.newsletter button{
  background:var(--ink); color:var(--paper); border:0; border-radius:3px;
  padding:10px 20px; font-size:14.5px; font-weight:600; white-space:nowrap;
}
.newsletter button:hover{background:var(--accent);}

/* ============================================================
   ARCHIVE / SEARCH
   ============================================================ */
.archive-head{padding:36px 0 22px; border-bottom:1px solid var(--ink);}
.archive-title{font-size:clamp(28px,4.4vw,38px); margin-bottom:8px;}
.archive-desc{color:var(--ink-soft); max-width:60ch; margin:0; font-size:16.5px;}
.archive-count{font-family:var(--mono); font-size:11px; color:var(--ink-faint); margin-top:12px;}

.post-list{display:flex; flex-direction:column;}
.post-row{
  display:grid; grid-template-columns:200px 1fr; gap:24px; padding:26px 0;
  border-bottom:1px solid var(--rule-soft); align-items:start;
}
@media (max-width:680px){.post-row{grid-template-columns:1fr; gap:14px;}}
.post-row .t{font-size:21px; line-height:1.24; margin:9px 0 8px;}
.post-row .t a{color:inherit; text-decoration:none;}
.post-row .t a:hover{color:var(--accent); text-decoration:none;}
.post-row .x{color:var(--ink-soft); font-size:15.5px; margin:0 0 11px; max-width:62ch;}

.pagination{display:flex; gap:8px; padding:32px 0; font-family:var(--mono); font-size:13px; flex-wrap:wrap;}
.pagination .page-numbers{
  border:1px solid var(--rule); border-radius:3px; padding:7px 13px;
  text-decoration:none; color:var(--ink-soft); min-width:38px; text-align:center;
}
.pagination .page-numbers:hover{border-color:var(--accent); color:var(--accent); text-decoration:none;}
.pagination .current{background:var(--ink); color:var(--paper); border-color:var(--ink);}

/* search */
.search-panel{
  display:none; position:fixed; inset:0; z-index:100; background:rgba(10,12,16,.5);
  backdrop-filter:blur(2px); padding:12vh 16px 16px;
}
.search-panel.open{display:block;}
.search-panel .box{
  max-width:560px; margin-inline:auto; background:var(--surface);
  border:1px solid var(--rule); border-radius:6px; padding:18px; box-shadow:0 20px 50px rgba(0,0,0,.22);
}
.search-panel input{
  width:100%; border:1px solid var(--rule); border-radius:3px; padding:12px 14px;
  font-size:16px; background:var(--paper); color:var(--ink); font-family:var(--sans);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{border-top:1px solid var(--rule); background:var(--surface); margin-top:auto;}
.footer-grid{
  display:grid; grid-template-columns:2fr 1fr 1fr; gap:32px; padding:40px 0 28px;
}
@media (max-width:720px){.footer-grid{grid-template-columns:1fr; gap:26px;}}
.footer-about{font-size:14.5px; color:var(--ink-soft); max-width:44ch; margin:12px 0 0; line-height:1.6;}
.footer-col .h{font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:12px;}
.footer-col ul{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:9px;}
.footer-col a{color:var(--ink-soft); text-decoration:none; font-size:14.5px;}
.footer-col a:hover{color:var(--accent);}
.footer-bar{
  border-top:1px solid var(--rule-soft); padding:16px 0 26px;
  font-family:var(--mono); font-size:11px; color:var(--ink-faint);
  display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap;
}

body{display:flex; flex-direction:column; min-height:100vh;}
.site-main{flex:1;}

/* ============================================================
   MOTION
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important; transition-duration:.01ms!important; scroll-behavior:auto!important;}
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth;}
  a,.icon-btn,.tag{transition:color .12s ease,border-color .12s ease,background-color .12s ease;}
}

/* reading progress */
.progress{
  position:fixed; top:0; left:0; height:2px; background:var(--accent); z-index:60;
  width:0; transition:width .1s linear;
}