/* ============================================================
   Blog Platform - core stylesheet
   Mobile-first. Themes override the variables in :root only,
   so a theme file never has to restate layout rules.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root{
  /* Overridden per-theme in assets/themes/*.css */
  --accent:#2563eb;
  --accent-ink:#ffffff;
  --accent-soft:color-mix(in srgb, var(--accent) 12%, transparent);

  --bg:#ffffff;
  --bg-alt:#f8fafc;
  --bg-sunk:#f1f5f9;
  --surface:#ffffff;
  --border:#e2e8f0;
  --border-strong:#cbd5e1;

  --ink:#0f172a;
  --ink-soft:#475569;
  --ink-mute:#94a3b8;

  --radius:12px;
  --radius-sm:8px;
  --radius-lg:20px;
  --radius-full:999px;

  --shadow-sm:0 1px 2px rgb(15 23 42 / .06);
  --shadow:0 4px 16px rgb(15 23 42 / .08);
  --shadow-lg:0 12px 32px rgb(15 23 42 / .12);

  --container:1200px;
  --gutter:1rem;
  --header-h:64px;

  --font-heading:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace;

  --step--1:clamp(.82rem,.79rem + .12vw,.88rem);
  --step-0:clamp(1rem,.96rem + .18vw,1.06rem);
  --step-1:clamp(1.2rem,1.12rem + .38vw,1.4rem);
  --step-2:clamp(1.45rem,1.3rem + .7vw,1.85rem);
  --step-3:clamp(1.75rem,1.5rem + 1.2vw,2.5rem);
  --step-4:clamp(2.1rem,1.7rem + 2vw,3.2rem);

  --ease:cubic-bezier(.4,0,.2,1);
  --ease-out:cubic-bezier(.16,1,.3,1);

  color-scheme:light;
}

[data-mode="dark"]{
  --bg:#0b1120;
  --bg-alt:#0f172a;
  --bg-sunk:#131c31;
  --surface:#131c31;
  --border:#1e293b;
  --border-strong:#334155;

  --ink:#e8edf6;
  --ink-soft:#a5b3c9;
  --ink-mute:#64748b;

  --shadow-sm:0 1px 2px rgb(0 0 0 / .3);
  --shadow:0 4px 16px rgb(0 0 0 / .4);
  --shadow-lg:0 12px 32px rgb(0 0 0 / .5);

  color-scheme:dark;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  /* Anchored headings must clear the sticky header. */
  scroll-padding-top:calc(var(--header-h) + 1rem);
}

body{
  font-family:var(--font-body);
  font-size:var(--step-0);
  line-height:1.65;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

img,picture,svg,video{display:block;max-width:100%;height:auto}
input,button,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);line-height:1.25;font-weight:750;letter-spacing:-.02em}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* ---------- Utilities ---------- */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  padding:.75rem 1.25rem;background:var(--accent);color:var(--accent-ink);
  border-radius:0 0 var(--radius-sm) 0;font-weight:600;
}
.skip-link:focus{left:0}

.container{
  width:100%;max-width:var(--container);
  margin-inline:auto;padding-inline:var(--gutter);
}
.container--narrow{max-width:760px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.65rem 1.25rem;border-radius:var(--radius-sm);
  font-weight:600;font-size:var(--step--1);
  background:var(--bg-sunk);color:var(--ink);
  border:1px solid var(--border);
  transition:background .18s var(--ease),transform .18s var(--ease),border-color .18s var(--ease);
  text-decoration:none;white-space:nowrap;
}
.btn:hover{background:var(--border);text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--accent{background:var(--accent);color:var(--accent-ink);border-color:transparent}
.btn--accent:hover{background:color-mix(in srgb,var(--accent) 86%,black);}
.btn--ghost{background:transparent}
.btn--sm{padding:.4rem .8rem;font-size:.8rem}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(1.6) blur(12px);
  -webkit-backdrop-filter:saturate(1.6) blur(12px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  display:flex;align-items:center;gap:1rem;
  min-height:var(--header-h);
}
.brand{display:flex;align-items:center;flex-shrink:0;text-decoration:none}
.brand__logo{width:var(--logo-w,150px);height:auto;object-fit:contain}
.brand__logo--dark{display:none}
[data-mode="dark"] .brand__logo--dark{display:block}
[data-mode="dark"] .brand__logo--light:not(:only-child){display:none}
.brand__text{
  font-family:var(--font-heading);font-weight:800;
  font-size:var(--step-1);color:var(--ink);letter-spacing:-.03em;
}

.primary-nav{margin-inline-start:auto}
.nav-list{display:flex;align-items:center;gap:.25rem}
.nav-list a{
  display:block;padding:.5rem .75rem;border-radius:var(--radius-sm);
  color:var(--ink-soft);font-weight:600;font-size:var(--step--1);
  text-decoration:none;transition:color .18s var(--ease),background .18s var(--ease);
  position:relative;
}
.nav-list a:hover{color:var(--ink);background:var(--bg-sunk)}
.nav-list a[aria-current]{color:var(--cat-color,var(--accent))}
.nav-list a[aria-current]::after{
  content:"";position:absolute;left:.75rem;right:.75rem;bottom:.15rem;
  height:2px;border-radius:2px;background:var(--cat-color,var(--accent));
}

.header-actions{display:flex;align-items:center;gap:.25rem;margin-inline-start:auto}
.primary-nav + .header-actions{margin-inline-start:0}
.icon-btn{
  display:grid;place-items:center;width:38px;height:38px;
  border-radius:var(--radius-sm);color:var(--ink-soft);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.icon-btn:hover{background:var(--bg-sunk);color:var(--ink)}
.icon-moon{display:none}
[data-mode="dark"] .icon-sun{display:none}
[data-mode="dark"] .icon-moon{display:block}

.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:38px;height:38px;border-radius:var(--radius-sm);padding:0 8px;
  margin-inline-start:auto;
}
.nav-toggle__bar{
  height:2px;background:var(--ink);border-radius:2px;
  transition:transform .25s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.search-panel{border-top:1px solid var(--border);background:var(--bg-alt);padding:1rem 0}
.search-form{display:flex;gap:.5rem}
.search-form input{
  flex:1;padding:.7rem 1rem;border:1px solid var(--border);
  border-radius:var(--radius-sm);background:var(--surface);
}
.search-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.search-form--big{max-width:560px;margin:1.5rem auto 0}

@media (max-width:900px){
  .nav-toggle{display:flex}
  .header-actions{margin-inline-start:0}
  .primary-nav{
    position:fixed;inset:var(--header-h) 0 auto;
    background:var(--bg);border-bottom:1px solid var(--border);
    padding:.5rem var(--gutter) 1rem;margin:0;
    transform:translateY(-120%);transition:transform .28s var(--ease-out);
    box-shadow:var(--shadow-lg);max-height:calc(100dvh - var(--header-h));overflow-y:auto;
  }
  .primary-nav.is-open{transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{padding:.85rem .5rem;border-radius:0;border-bottom:1px solid var(--border)}
  .nav-list a[aria-current]::after{display:none}
}

/* ---------- Ticker ---------- */
.ticker{
  background:var(--ink);color:var(--bg);
  border-bottom:1px solid var(--border);overflow:hidden;
}
[data-mode="dark"] .ticker{background:var(--bg-sunk);color:var(--ink)}
.ticker-inner{display:flex;align-items:center;gap:.75rem;height:42px}

.ticker__label{
  display:inline-flex;align-items:center;gap:.4rem;flex-shrink:0;
  padding:.25rem .7rem;border-radius:var(--radius-full);
  background:var(--accent);color:var(--accent-ink);
  font-size:.7rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;
}
.ticker__pulse{
  width:6px;height:6px;border-radius:50%;background:currentColor;
  animation:pulse 1.6s var(--ease) infinite;
}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.7)}}

.ticker__viewport{flex:1;overflow:hidden;position:relative;mask-image:linear-gradient(90deg,transparent,#000 2rem,#000 calc(100% - 2rem),transparent)}
.ticker__track{
  display:flex;width:max-content;
  animation:ticker-scroll var(--ticker-duration,40s) linear infinite;
}
.ticker__track:hover,.ticker.is-paused .ticker__track{animation-play-state:paused}
.ticker__list{display:flex;align-items:center}
.ticker__item{display:flex;align-items:center;white-space:nowrap;font-size:var(--step--1)}
.ticker__item::after{
  content:"";width:4px;height:4px;border-radius:50%;
  background:currentColor;opacity:.4;margin:0 1.25rem;
}
.ticker__item a{color:inherit;text-decoration:none;transition:opacity .15s}
.ticker__item a:hover{opacity:.75;text-decoration:underline}

/* Track is rendered twice; -50% lands exactly on the second copy. */
@keyframes ticker-scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}

.ticker__pause{
  flex-shrink:0;display:grid;place-items:center;width:26px;height:26px;
  border-radius:50%;color:inherit;opacity:.6;transition:opacity .15s;
}
.ticker__pause:hover{opacity:1}
.ticker__pause .icon-play{display:none}
.ticker.is-paused .ticker__pause .icon-play{display:block}
.ticker.is-paused .ticker__pause .icon-pause{display:none}

@media (max-width:640px){
  .ticker__label{font-size:.62rem;padding:.2rem .5rem}
  .ticker__pause{display:none}
}

/* ---------- Hero slider ---------- */
.hero{position:relative;background:var(--bg-sunk);overflow:hidden}
.hero__track{
  display:flex;overflow-x:auto;scroll-snap-type:x mandatory;
  scrollbar-width:none;-ms-overflow-style:none;
}
.hero__track::-webkit-scrollbar{display:none}
.hero__slide{
  position:relative;flex:0 0 100%;scroll-snap-align:center;
  min-height:clamp(280px,42vw,520px);display:grid;
}
.hero__img{grid-area:1/1;width:100%;height:100%;object-fit:cover}
.hero__overlay{
  grid-area:1/1;
  background:linear-gradient(90deg,rgb(2 6 23 / .82) 0%,rgb(2 6 23 / .55) 45%,rgb(2 6 23 / .15) 100%);
}
.hero__content{grid-area:1/1;align-self:center;position:relative;z-index:2;color:#fff}
.hero__title{font-size:var(--step-4);max-width:20ch;text-shadow:0 2px 20px rgb(0 0 0 / .4)}
.hero__subtitle{margin-top:.75rem;max-width:52ch;font-size:var(--step-1);opacity:.92}
.hero__btn{margin-top:1.5rem}

.hero__nav{
  position:absolute;top:50%;transform:translateY(-50%);z-index:3;
  display:grid;place-items:center;width:44px;height:44px;border-radius:50%;
  background:rgb(255 255 255 / .15);color:#fff;backdrop-filter:blur(8px);
  transition:background .18s var(--ease);
}
.hero__nav:hover{background:rgb(255 255 255 / .3)}
.hero__nav--prev{inset-inline-start:1rem}
.hero__nav--next{inset-inline-end:1rem}

.hero__dots{position:absolute;bottom:1rem;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:.5rem}
.hero__dot{
  width:8px;height:8px;border-radius:var(--radius-full);
  background:rgb(255 255 255 / .45);transition:all .25s var(--ease);
}
.hero__dot.is-active{width:26px;background:#fff}

.hero__playpause{
  position:absolute;bottom:1rem;inset-inline-end:1rem;z-index:3;
  display:grid;place-items:center;width:30px;height:30px;border-radius:50%;
  background:rgb(255 255 255 / .15);color:#fff;backdrop-filter:blur(8px);
}
.hero__playpause .icon-play{display:none}
.hero__playpause[aria-pressed="true"] .icon-play{display:block}
.hero__playpause[aria-pressed="true"] .icon-pause{display:none}

@media (max-width:640px){
  .hero__nav{display:none}
  .hero__overlay{background:linear-gradient(0deg,rgb(2 6 23 / .85) 10%,rgb(2 6 23 / .3) 100%)}
  .hero__content{align-self:end;padding-bottom:3rem}
}

/* ---------- Layout ---------- */
.site-main{min-height:60vh;padding-block:2rem 3rem}
.layout{display:grid;gap:2.5rem;align-items:start}

@media (min-width:1024px){
  .layout--right{grid-template-columns:minmax(0,1fr) 320px}
  .layout--left{grid-template-columns:320px minmax(0,1fr)}
  .layout--left .sidebar{order:-1}
  .layout--none{grid-template-columns:minmax(0,1fr)}
  .layout--none .sidebar{display:none}
}

.section-head{
  display:flex;align-items:baseline;justify-content:space-between;
  gap:1rem;margin-bottom:1.25rem;
}
.section-title{
  display:flex;align-items:center;gap:.6rem;
  font-size:var(--step-2);
}
.section-title__mark{
  width:4px;height:1.1em;border-radius:2px;
  background:var(--accent);flex-shrink:0;
}
.section-count{font-size:var(--step--1);color:var(--ink-mute)}

/* ---------- Cards ---------- */
.card-grid{display:grid;gap:1.5rem}
.card-grid--2{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr))}
.card-grid--3{grid-template-columns:repeat(auto-fill,minmax(min(100%,240px),1fr))}
.card-grid--4{grid-template-columns:repeat(auto-fill,minmax(min(100%,210px),1fr))}
.card-grid__ad{display:grid;place-items:center}
.card-grid__ad--full{grid-column:1/-1}

.card{
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  transition:transform .25s var(--ease-out),box-shadow .25s var(--ease-out),border-color .25s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--border-strong)}

.card__media{position:relative;display:block;aspect-ratio:16/10;background:var(--bg-sunk);overflow:hidden}
.card__media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease-out)}
.card:hover .card__media img{transform:scale(1.04)}
.card__placeholder{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-heading);font-size:2.5rem;font-weight:800;
  color:var(--ink-mute);background:var(--bg-sunk);
}
.card__cat{
  position:absolute;inset-block-start:.6rem;inset-inline-start:.6rem;
  padding:.2rem .6rem;border-radius:var(--radius-full);
  background:var(--cat-color,var(--accent));color:#fff;
  font-size:.68rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;
}
.card__body{display:flex;flex-direction:column;gap:.5rem;padding:1rem;flex:1}
.card__title{font-size:var(--step-1);line-height:1.3}
.card__title a{color:var(--ink);text-decoration:none}
.card__title a:hover{color:var(--accent)}
.card__excerpt{font-size:var(--step--1);color:var(--ink-soft);line-height:1.55}
.card__meta{
  display:flex;align-items:center;flex-wrap:wrap;gap:.4rem;
  margin-top:auto;padding-top:.5rem;
  font-size:.78rem;color:var(--ink-mute);
}
.card__author{display:inline-flex;align-items:center;gap:.35rem;color:inherit;text-decoration:none}
.card__author:hover{color:var(--accent)}

.card--minimal .card__body{padding:.75rem}
.card--minimal .card__title{font-size:var(--step-0)}

/* ---------- Avatars ---------- */
.avatar{border-radius:50%;object-fit:cover;flex-shrink:0}
.avatar--xs{width:24px;height:24px}
.avatar--initials{
  display:grid;place-items:center;width:40px;height:40px;
  background:var(--accent-soft);color:var(--accent);
  font-weight:700;font-size:.85rem;border-radius:50%;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs{margin-bottom:1.25rem;font-size:var(--step--1)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem}
.breadcrumbs li{display:flex;align-items:center;gap:.4rem;color:var(--ink-mute)}
.breadcrumbs li+li::before{content:"/";color:var(--ink-mute);opacity:.5}
.breadcrumbs a{color:var(--ink-soft);text-decoration:none}
.breadcrumbs a:hover{color:var(--accent)}
.breadcrumbs [aria-current]{color:var(--ink);font-weight:500;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:40ch}

/* ---------- Post ---------- */
.post-header{margin-bottom:1.75rem}
.post-category{
  display:inline-block;margin-bottom:.75rem;
  padding:.25rem .75rem;border-radius:var(--radius-full);
  background:color-mix(in srgb,var(--cat-color,var(--accent)) 14%,transparent);
  color:var(--cat-color,var(--accent));
  font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  text-decoration:none;
}
.post-title{font-size:var(--step-4);margin-bottom:.75rem;text-wrap:balance}
.post-lead{font-size:var(--step-1);color:var(--ink-soft);line-height:1.55;text-wrap:pretty}

.post-meta{
  display:flex;align-items:center;flex-wrap:wrap;gap:.75rem 1rem;
  margin-top:1.25rem;padding-block:1rem;
  border-block:1px solid var(--border);
}
.post-author{display:inline-flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink)}
.post-author:hover .post-author__name{color:var(--accent)}
.post-author__name{font-weight:650;font-size:var(--step--1)}
.post-meta__facts{
  display:flex;align-items:center;flex-wrap:wrap;gap:.5rem;
  font-size:var(--step--1);color:var(--ink-mute);
}
.post-editor{font-style:italic}

.post-feature{margin-block:1.5rem;border-radius:var(--radius);overflow:hidden}
.post-feature img{width:100%;height:auto}
.post-feature figcaption{
  padding:.6rem .25rem;font-size:.8rem;color:var(--ink-mute);text-align:center;
}

/* ---------- Post body typography ---------- */
.post-body{font-size:1.075rem;line-height:1.8;color:var(--ink)}
.post-body > * + *{margin-top:1.25em}
.post-body p{text-wrap:pretty}
.post-body h2{font-size:var(--step-3);margin-top:2.25em;margin-bottom:.6em}
.post-body h3{font-size:var(--step-2);margin-top:1.75em;margin-bottom:.5em}
.post-body h4{font-size:var(--step-1);margin-top:1.5em;margin-bottom:.4em}
.post-body a{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.post-body a:hover{text-decoration-thickness:2px}
.post-body ul,.post-body ol{padding-inline-start:1.5em}
.post-body ul li{list-style:disc}
.post-body ol li{list-style:decimal}
.post-body li+li{margin-top:.4em}
.post-body li::marker{color:var(--accent)}
.post-body blockquote{
  padding:1rem 1.25rem;margin-inline:0;
  border-inline-start:3px solid var(--accent);
  background:var(--bg-alt);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-style:italic;color:var(--ink-soft);
}
.post-body blockquote p+p{margin-top:.75em}
.post-body code{
  padding:.15em .4em;border-radius:4px;
  background:var(--bg-sunk);border:1px solid var(--border);
  font-family:var(--font-mono);font-size:.88em;
}
.post-body pre{
  padding:1rem 1.25rem;border-radius:var(--radius-sm);
  background:#0f172a;color:#e2e8f0;overflow-x:auto;
  font-family:var(--font-mono);font-size:.85rem;line-height:1.6;
}
.post-body pre code{background:none;border:0;padding:0;color:inherit}
.post-body hr{border:0;border-top:1px solid var(--border);margin-block:2.5em}

.post-heading{scroll-margin-top:calc(var(--header-h) + 1rem);position:relative}

.post-figure{margin-block:1.75em}
.post-figure img{width:100%;border-radius:var(--radius);}
.post-figure figcaption{
  margin-top:.6rem;font-size:.82rem;color:var(--ink-mute);text-align:center;
}
.post-img{border-radius:var(--radius)}

.table-scroll{overflow-x:auto;border-radius:var(--radius-sm);border:1px solid var(--border)}
.post-table{width:100%;border-collapse:collapse;font-size:var(--step--1)}
.post-table th,.post-table td{padding:.7rem 1rem;text-align:start;border-bottom:1px solid var(--border)}
.post-table th{background:var(--bg-alt);font-weight:700;white-space:nowrap}
.post-table tr:last-child td{border-bottom:0}
.post-table tbody tr:hover{background:var(--bg-alt)}

.embed-responsive{position:relative;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;background:var(--bg-sunk)}
.embed-responsive iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

.external-link::after{
  content:"↗";display:inline-block;margin-inline-start:.15em;
  font-size:.75em;vertical-align:super;opacity:.6;text-decoration:none;
}


/* Auto internal links woven into the article body. Styled as a quiet
   inline callout so it reads as a helpful pointer, not an ad. */
.post-interlink{
  margin-block:1.25em;padding:.6rem .9rem;
  border-inline-start:3px solid var(--accent);
  background:var(--accent-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-size:.95em;line-height:1.5;
}
.post-interlink__label{
  font-weight:700;color:var(--accent);margin-inline-end:.35em;
  text-transform:uppercase;font-size:.72em;letter-spacing:.04em;
}
.post-interlink__link{font-weight:600;text-decoration:none;color:var(--ink)}
.post-interlink__link:hover{color:var(--accent);text-decoration:underline}

/* ---------- Table of contents ---------- */
.toc{
  position:relative;margin-block:2rem;
  background:var(--bg-alt);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.toc__toggle{
  display:flex;align-items:center;gap:.6rem;width:100%;
  padding:.9rem 1.1rem;text-align:start;color:var(--ink);
  transition:background .18s var(--ease);
}
.toc__toggle:hover{background:var(--bg-sunk)}
.toc__icon{display:grid;place-items:center;color:var(--accent)}
.toc__title{font-family:var(--font-heading);font-weight:700;font-size:var(--step-0)}
.toc__count{
  padding:.1rem .5rem;border-radius:var(--radius-full);
  background:var(--accent-soft);color:var(--accent);
  font-size:.7rem;font-weight:700;
}
.toc__chevron{margin-inline-start:auto;color:var(--ink-mute);transition:transform .3s var(--ease)}
.toc.is-collapsed .toc__chevron{transform:rotate(-90deg)}

/* Collapse is driven by main.js, which measures the real height and
   animates it. The expanded default is plain natural height, so it can
   never mis-size or overlap the article body — even with JavaScript off.
   (The old grid-template-rows:1fr technique mis-sized in some browsers
   and let the lower TOC items spill over the text below it.) */
.toc__body{overflow:hidden}
.toc__body.is-animating{transition:height .35s var(--ease-out)}
.toc.is-collapsed .toc__body{height:0}

.toc__list{padding:0 1.1rem 1rem}
.toc__list--0{padding-top:.25rem}
.toc__list--1{padding:.25rem 0 .25rem 1.1rem;border-inline-start:1px solid var(--border);margin-inline-start:.4rem}
.toc__list--2{padding:.2rem 0 .2rem .9rem;border-inline-start:1px solid var(--border);margin-inline-start:.4rem}

/* Items are always visible — no entrance animation. A staggered fade was
   removed on purpose: it could leave items invisible during their delay in
   some browsers, and reliability matters more than the flourish here. */
.toc__item{opacity:1}

.toc__link{
  display:flex;align-items:center;gap:.5rem;
  padding:.35rem .25rem;border-radius:var(--radius-sm);
  color:var(--ink-soft);font-size:var(--step--1);line-height:1.45;
  text-decoration:none;transition:color .18s var(--ease);
}
.toc__link:hover{color:var(--accent);text-decoration:none}
.toc__marker{
  width:5px;height:5px;border-radius:50%;flex-shrink:0;
  background:var(--border-strong);transition:all .2s var(--ease);
}
.toc__link.is-active{color:var(--accent);font-weight:650}
.toc__link.is-active .toc__marker{background:var(--accent);transform:scale(1.6)}
.toc__text{flex:1}

.toc__progress{height:2px;background:var(--border)}
.toc__progress span{display:block;height:100%;width:0;background:var(--accent);transition:width .2s linear}

/* Sticky TOC on wide screens - it follows the reader down the article. */
@media (min-width:1280px){
  .toc{position:sticky;top:calc(var(--header-h) + 1rem);z-index:5}
}

/* ---------- Reading progress ---------- */
.reading-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:80;background:transparent;pointer-events:none}
.reading-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 50%,#a855f7));
  transition:width .1s linear;
}

/* ---------- Share ---------- */
.share{position:relative;display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}
.share--compact{margin-top:1rem}
.share--full{
  margin-block:2rem;padding:1.25rem;
  background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);
  flex-direction:column;align-items:flex-start;
}
.share__label{font-weight:700;font-family:var(--font-heading);font-size:var(--step-0)}
.share__buttons{display:flex;flex-wrap:wrap;gap:.5rem}
.share__btn{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.5rem .75rem;border-radius:var(--radius-sm);
  background:var(--surface);border:1px solid var(--border);
  color:var(--ink-soft);font-size:.8rem;font-weight:600;
  text-decoration:none;
  transition:all .18s var(--ease);
}
.share--compact .share__btn{width:36px;height:36px;padding:0;justify-content:center;border-radius:50%}
.share__btn:hover{transform:translateY(-2px);color:#fff;text-decoration:none;border-color:transparent}
.share__btn--facebook:hover{background:#1877f2}
.share__btn--x:hover{background:#000}
.share__btn--linkedin:hover{background:#0a66c2}
.share__btn--whatsapp:hover{background:#25d366}
.share__btn--telegram:hover{background:#26a5e4}
.share__btn--pinterest:hover{background:#e60023}
.share__btn--copy:hover,.share__btn--print:hover,.share__btn--native:hover{background:var(--accent)}
.share__toast{
  position:absolute;bottom:calc(100% + .5rem);inset-inline-start:0;
  padding:.4rem .75rem;border-radius:var(--radius-sm);
  background:var(--ink);color:var(--bg);font-size:.75rem;font-weight:600;
  opacity:0;transform:translateY(4px);pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.share__toast.is-visible{opacity:1;transform:translateY(0)}

/* Pinterest hover-save button, injected by main.js */
.pin-save{
  position:absolute;top:.75rem;inset-inline-start:.75rem;z-index:4;
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.45rem .75rem;border-radius:var(--radius-full);
  background:#e60023;color:#fff;font-size:.75rem;font-weight:700;
  text-decoration:none;box-shadow:var(--shadow);
  opacity:0;transform:translateY(-4px);transition:all .2s var(--ease);
  pointer-events:none;
}
.post-figure,.post-feature{position:relative}
.post-figure:hover .pin-save,.post-feature:hover .pin-save,.pin-save:focus{
  opacity:1;transform:translateY(0);pointer-events:auto;
}
.pin-save:hover{background:#ad081b;text-decoration:none}
@media (hover:none){.pin-save{opacity:1;transform:none;pointer-events:auto}}

/* ---------- Tags ---------- */
.post-tags{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-block:1.75rem}
.post-tags__label{font-size:var(--step--1);color:var(--ink-mute);font-weight:600}
.tag-chip{
  display:inline-block;padding:.3rem .7rem;border-radius:var(--radius-full);
  background:var(--bg-sunk);border:1px solid var(--border);
  color:var(--ink-soft);font-size:.78rem;font-weight:600;text-decoration:none;
  transition:all .18s var(--ease);
}
.tag-chip:hover{background:var(--accent);color:var(--accent-ink);border-color:transparent;text-decoration:none}
.tag-cloud{display:flex;flex-wrap:wrap;gap:.4rem}

/* ---------- Author box ---------- */
.author-box{
  display:flex;gap:1.25rem;margin-block:2rem;padding:1.5rem;
  background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);
}
.author-box__avatar{width:72px;height:72px;border-radius:50%;object-fit:cover;flex-shrink:0;font-size:1.3rem}
.author-box__label{font-size:.72rem;color:var(--ink-mute);text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.author-box__name{font-size:var(--step-1);margin-block:.15rem .5rem}
.author-box__name a{color:var(--ink);text-decoration:none}
.author-box__name a:hover{color:var(--accent)}
.author-box__bio{font-size:var(--step--1);color:var(--ink-soft);line-height:1.6}
.author-box__social{display:flex;gap:.75rem;margin-top:.75rem;font-size:.8rem;font-weight:600}
@media (max-width:560px){.author-box{flex-direction:column;text-align:center;align-items:center}}

/* ---------- Author archive header ---------- */
.author-head{background:var(--bg-alt);border-bottom:1px solid var(--border);padding-block:2.5rem}
.author-head__inner{display:flex;align-items:center;gap:1.5rem}
.author-head__avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;flex-shrink:0;font-size:1.75rem}
.author-head__label{font-size:.72rem;color:var(--ink-mute);text-transform:uppercase;letter-spacing:.08em;font-weight:700}
.author-head__name{font-size:var(--step-3);margin-block:.2rem .5rem}
.author-head__bio{color:var(--ink-soft);max-width:60ch}
.author-head__stats{display:flex;flex-wrap:wrap;gap:1.25rem;margin-top:.75rem;font-size:var(--step--1);color:var(--ink-mute)}
.author-head__stats strong{color:var(--ink)}
.author-head__social{display:flex;gap:.75rem;margin-top:.5rem;font-size:.8rem;font-weight:600}
@media (max-width:640px){.author-head__inner{flex-direction:column;text-align:center}}

/* ---------- Archive header ---------- */
.archive-head{background:var(--bg-alt);border-bottom:1px solid var(--border);padding-block:2rem}
.archive-title{font-size:var(--step-3);color:var(--cat-color,var(--ink))}
.archive-sub{margin-top:.5rem;color:var(--ink-soft);max-width:65ch}
.archive-count{margin-top:.5rem;font-size:var(--step--1);color:var(--ink-mute)}

/* ---------- Post nav ---------- */
.post-nav{display:grid;gap:1rem;margin-block:2rem}
@media (min-width:640px){.post-nav{grid-template-columns:1fr 1fr}}
.post-nav__link{
  display:flex;flex-direction:column;gap:.35rem;padding:1rem 1.25rem;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  text-decoration:none;transition:all .2s var(--ease);
}
.post-nav__link:hover{border-color:var(--accent);transform:translateY(-2px);text-decoration:none;box-shadow:var(--shadow-sm)}
.post-nav__link--next{text-align:end}
.post-nav__label{font-size:.72rem;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.post-nav__title{color:var(--ink);font-weight:650;font-size:var(--step--1);line-height:1.4}

/* ---------- Sidebar ---------- */
.sidebar{display:flex;flex-direction:column;gap:1.5rem}
@media (max-width:1023px){
  /* Sidebar ads would push the article down on the devices that matter
     most, so the whole column moves below the content on mobile. */
  .sidebar{margin-top:1rem}
  .widget--sticky{display:none}
}
.widget{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.25rem;
}
.widget--sticky{position:sticky;top:calc(var(--header-h) + 1rem);padding:0;border:0;background:none}
.widget__title{
  font-size:var(--step-0);margin-bottom:1rem;padding-bottom:.6rem;
  border-bottom:1px solid var(--border);
}

.rank-list{display:flex;flex-direction:column;gap:.9rem}
.rank-list__item{display:flex;gap:.75rem;align-items:flex-start}
.rank-list__num{
  flex-shrink:0;width:24px;font-family:var(--font-heading);
  font-size:1.15rem;font-weight:800;color:var(--accent);opacity:.45;line-height:1.3;
}
.rank-list__title{
  display:block;color:var(--ink);font-size:.9rem;font-weight:600;
  line-height:1.4;text-decoration:none;
}
.rank-list__title:hover{color:var(--accent)}
.rank-list__meta{font-size:.72rem;color:var(--ink-mute)}

.cat-list{display:flex;flex-direction:column;gap:.15rem}
.cat-list a{
  display:flex;align-items:center;gap:.6rem;padding:.5rem .25rem;
  border-radius:var(--radius-sm);color:var(--ink-soft);
  font-size:var(--step--1);font-weight:600;text-decoration:none;
  transition:all .15s var(--ease);
}
.cat-list a:hover{background:var(--bg-sunk);color:var(--ink)}
.cat-list__dot{width:8px;height:8px;border-radius:50%;background:var(--cat-color,var(--accent));flex-shrink:0}
.cat-list__name{flex:1}
.cat-list__count{
  font-size:.72rem;color:var(--ink-mute);background:var(--bg-sunk);
  padding:.05rem .45rem;border-radius:var(--radius-full);
}

/* ---------- Pagination ---------- */
.pagination{margin-top:2.5rem;text-align:center}
.pagination__list{display:flex;justify-content:center;flex-wrap:wrap;gap:.35rem}
.pagination__link{
  display:grid;place-items:center;min-width:40px;height:40px;padding-inline:.7rem;
  border-radius:var(--radius-sm);border:1px solid var(--border);
  background:var(--surface);color:var(--ink-soft);
  font-size:var(--step--1);font-weight:650;text-decoration:none;
  transition:all .18s var(--ease);
}
.pagination__link:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.pagination__link.is-current{background:var(--accent);color:var(--accent-ink);border-color:transparent}
.pagination__gap{display:grid;place-items:center;min-width:28px;height:40px;color:var(--ink-mute)}
.pagination__info{margin-top:.9rem;font-size:.8rem;color:var(--ink-mute)}

/* ---------- Empty / error ---------- */
.empty{
  display:flex;flex-direction:column;align-items:center;gap:.75rem;
  padding:3.5rem 1.5rem;text-align:center;color:var(--ink-mute);
  background:var(--bg-alt);border:1px dashed var(--border-strong);border-radius:var(--radius);
}
.empty h3{color:var(--ink);font-size:var(--step-1)}
.empty .btn{margin-top:.5rem}

.error-page{text-align:center;padding-block:3rem 2rem}
.error-page__code{
  font-family:var(--font-heading);font-size:clamp(4.5rem,18vw,9rem);
  font-weight:900;line-height:1;letter-spacing:-.05em;
  background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 40%,#a855f7));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.error-page__title{font-size:var(--step-3);margin-block:.5rem}
.error-page__msg{color:var(--ink-soft);max-width:50ch;margin-inline:auto}
.error-page .btn--ghost{margin-top:1.5rem}

.preview-bar{
  padding:.65rem var(--gutter);text-align:center;
  background:#fef3c7;color:#78350f;font-size:var(--step--1);
  border-bottom:1px solid #fcd34d;
}
[data-mode="dark"] .preview-bar{background:#422006;color:#fde68a;border-color:#78350f}
.preview-bar a{color:inherit;font-weight:700;text-decoration:underline}

/* ---------- Featured strip ---------- */
.featured-strip{padding-block:2rem;background:var(--bg-alt);border-bottom:1px solid var(--border)}

/* ---------- Footer ---------- */
.site-footer{
  margin-top:4rem;padding-block:3rem 1.5rem;
  background:var(--bg-alt);border-top:1px solid var(--border);
}
.footer-grid{display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr))}
.footer-col--brand{grid-column:span 1}
@media (min-width:768px){.footer-col--brand{max-width:30ch}}
.footer__logo{margin-bottom:.75rem}
.footer__name{font-family:var(--font-heading);font-weight:800;font-size:var(--step-1);color:var(--ink)}
.footer__desc{margin-top:.5rem;font-size:var(--step--1);color:var(--ink-soft);line-height:1.6}
.footer__feed{
  display:inline-flex;align-items:center;gap:.4rem;margin-top:1rem;
  font-size:.8rem;font-weight:600;color:var(--ink-mute);text-decoration:none;
}
.footer__feed:hover{color:var(--accent)}
.footer__title{
  font-size:.78rem;text-transform:uppercase;letter-spacing:.07em;
  color:var(--ink-mute);margin-bottom:.9rem;font-weight:700;
}
.footer__list{display:flex;flex-direction:column;gap:.55rem}
.footer__list a{
  display:flex;align-items:center;justify-content:space-between;gap:.5rem;
  color:var(--ink-soft);font-size:var(--step--1);text-decoration:none;
  transition:color .15s var(--ease);
}
.footer__list a:hover{color:var(--accent)}
.footer__count{font-size:.7rem;color:var(--ink-mute);background:var(--bg-sunk);padding:.05rem .4rem;border-radius:var(--radius-full)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem;
  margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--border);
  font-size:.8rem;color:var(--ink-mute);
}
.footer__meta{display:flex;gap:1rem}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;bottom:1.25rem;inset-inline-end:1.25rem;z-index:50;
  display:grid;place-items:center;width:44px;height:44px;border-radius:50%;
  background:var(--accent);color:var(--accent-ink);box-shadow:var(--shadow-lg);
  opacity:0;transform:translateY(10px);transition:all .25s var(--ease-out);
}
.to-top.is-visible{opacity:1;transform:translateY(0)}
.to-top:hover{transform:translateY(-2px)}
.to-top[hidden]{display:none}

/* ---------- Ads ---------- */
.ad-slot{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:.25rem;margin-block:1.75rem;padding:.5rem;
  background:var(--bg-alt);border:1px dashed var(--border);
  border-radius:var(--radius-sm);overflow:hidden;
  /* min-height is set inline per slot to reserve space and protect CLS. */
}
.ad-slot:empty{display:none}
.ad-label{
  font-size:.6rem;text-transform:uppercase;letter-spacing:.1em;
  color:var(--ink-mute);opacity:.7;
}
.ad-slot ins,.ad-slot iframe{max-width:100%}
.ad-inline{margin-block:2rem}

.ad-anchor{
  position:fixed;bottom:0;left:0;right:0;z-index:70;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface);border-top:1px solid var(--border);
  box-shadow:0 -4px 16px rgb(0 0 0 / .1);
  transform:translateY(100%);transition:transform .3s var(--ease-out);
}
.ad-anchor.is-visible{transform:translateY(0)}
.ad-anchor .ad-slot{margin:0;border:0;background:none;padding:.25rem}
.ad-anchor__close{
  position:absolute;top:-24px;inset-inline-end:.5rem;
  display:grid;place-items:center;width:24px;height:24px;
  border-radius:6px 6px 0 0;background:var(--surface);
  border:1px solid var(--border);border-bottom:0;
  color:var(--ink-mute);font-size:1rem;line-height:1;
}
@media (min-width:1024px){.ad-anchor{display:none}}

/* ---------- Print ---------- */
@media print{
  .site-header,.ticker,.sidebar,.share,.ad-slot,.ad-anchor,.to-top,
  .post-nav,.related,.toc,.site-footer,.reading-progress,.breadcrumbs,
  .hero,.featured-strip,.pagination,.preview-bar,.pin-save{
    display:none !important;
  }
  html{font-size:11pt}
  body{background:#fff;color:#000}
  .layout{display:block}
  .site-main{padding:0}
  .post-title{font-size:22pt}
  .post-body{font-size:11pt;line-height:1.5}
  .post-body h2{font-size:15pt;page-break-after:avoid}
  .post-body h3{font-size:13pt;page-break-after:avoid}
  .post-figure,.post-feature{page-break-inside:avoid;max-width:100%}
  .post-body img{max-width:100% !important;max-height:8cm;object-fit:contain}
  .post-body pre,.post-body blockquote,.post-table{page-break-inside:avoid;border:1px solid #ccc}
  /* Print the destination of every link, since a printed page has no hover. */
  .post-body a::after{content:" (" attr(href) ")";font-size:8pt;color:#555;word-break:break-all}
  .post-body a[href^="#"]::after{content:""}
  .author-box{border:1px solid #ccc;page-break-inside:avoid}
  @page{margin:1.6cm}
}

/* ============================================================
   Mobile overflow guards
   Grid/flex children default to min-width:auto (min-content), so a long
   code line, a wide table or the ticker track can force the whole page
   wider than the phone screen. Telling these containers they may shrink
   lets their inner overflow-x boxes scroll on their own instead.
   ============================================================ */
.layout > *{min-width:0}
.feed,.post,.post-body,.sidebar{min-width:0}
.post-body pre{max-width:100%}
.ticker__viewport{min-width:0}
.card__body,.card__title,.card__excerpt{min-width:0;overflow-wrap:anywhere}
.breadcrumbs [aria-current]{min-width:0}
/* Belt-and-suspenders: never let the document scroll sideways. */
html{overflow-x:hidden}