/* binhAI — design tokens (light default, dark via prefers-color-scheme or [data-theme]) */
:root{
  --bg:#FAFAFA; --surface:#FFFFFF; --surface-2:#F4F4F5; --text:#0A0A0B; --text-2:#3F3F46; --muted:#52525B;
  --border:#E4E4E7; --border-strong:#D4D4D8;
  --accent:#4338CA; --accent-hover:#3730A3; --on-accent:#FFFFFF; --accent-soft:#EEF2FF; --accent-text:#4338CA;
  --ok:#15803D; --code-bg:#F4F4F5;
  --shadow:0 1px 2px rgba(10,10,11,.04),0 4px 16px rgba(10,10,11,.04);
  --shadow-hover:0 2px 4px rgba(10,10,11,.06),0 12px 32px rgba(10,10,11,.08);
  --radius:14px; --radius-sm:10px;
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --cover-mix:16%; --cover-mix-2:5%;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0B0B0F; --surface:#131318; --surface-2:#1A1A20; --text:#F4F4F5; --text-2:#D4D4D8; --muted:#A1A1AA;
    --border:#27272A; --border-strong:#3F3F46;
    --accent:#818CF8; --accent-hover:#A5B4FC; --on-accent:#0B0B0F; --accent-soft:rgba(129,140,248,.12); --accent-text:#A5B4FC;
    --ok:#4ADE80; --code-bg:#1A1A20;
    --shadow:0 1px 2px rgba(0,0,0,.4); --shadow-hover:0 8px 28px rgba(0,0,0,.45);
    --cover-mix:26%; --cover-mix-2:8%;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0B0B0F; --surface:#131318; --surface-2:#1A1A20; --text:#F4F4F5; --text-2:#D4D4D8; --muted:#A1A1AA;
  --border:#27272A; --border-strong:#3F3F46;
  --accent:#818CF8; --accent-hover:#A5B4FC; --on-accent:#0B0B0F; --accent-soft:rgba(129,140,248,.12); --accent-text:#A5B4FC;
  --ok:#4ADE80; --code-bg:#1A1A20;
  --shadow:0 1px 2px rgba(0,0,0,.4); --shadow-hover:0 8px 28px rgba(0,0,0,.45);
  --cover-mix:26%; --cover-mix-2:8%;
  color-scheme:dark;
}

/* Category hues (decorative covers only — text never relies on them) */
[data-cat="agents"]{--cat:#6366F1}
[data-cat="tips"]{--cat:#F59E0B}
[data-cat="workflow"]{--cat:#10B981}
[data-cat="tools"]{--cat:#0EA5E9}
[data-cat="system"]{--cat:#F43F5E}
[data-cat="reading"]{--cat:#64748B}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;min-height:100dvh;display:flex;flex-direction:column}
main{flex:1}
img,iframe{max-width:100%}
a{color:var(--accent-text);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--accent-hover)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0;color:var(--text)}
p{margin:0}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
.muted{color:var(--muted)} .small{font-size:14px} .nowrap{white-space:nowrap}
.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}
.i{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.skip{position:absolute;left:-9999px;top:8px;z-index:100;background:var(--accent);color:var(--on-accent);padding:10px 14px;border-radius:8px}
.skip:focus{left:12px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 85%,transparent);
  backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;gap:12px;height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:-.02em;color:var(--text);text-decoration:none}
.logo b{color:var(--accent-text);font-weight:700}
.logo-mark{width:30px;height:30px;border-radius:9px;background:var(--text);color:var(--bg);display:grid;place-items:center;font-size:17px;font-weight:700}
.nav-links{display:none;gap:4px;margin-left:24px}
.nav-links a{color:var(--text-2);text-decoration:none;font-size:15px;font-weight:500;padding:8px 12px;border-radius:8px;transition:background .2s var(--ease),color .2s var(--ease)}
.nav-links a:hover{background:var(--surface-2);color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);background:var(--surface-2)}
@media(min-width:768px){.nav-links{display:flex}}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.lang{display:flex;align-items:center;gap:2px;padding:4px 4px 4px 10px;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:var(--surface)}
.lang .i{width:16px;height:16px;margin-right:4px}
.lang a{min-width:40px;min-height:34px;display:grid;place-items:center;font-size:13px;font-weight:600;color:var(--muted);text-decoration:none;border-radius:999px;transition:background .2s var(--ease),color .2s var(--ease)}
.lang a:hover{color:var(--text)}
.lang a[aria-current="true"]{background:var(--text);color:var(--bg)}
@media(max-width:420px){.lang{padding-left:4px}.lang .i{display:none}.lang a{min-width:36px}}
.icon-btn{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--text);cursor:pointer;transition:background .2s var(--ease),border-color .2s var(--ease)}
.icon-btn:hover{background:var(--surface-2);border-color:var(--border-strong)}
.theme-toggle .i-moon{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:none}
:root[data-theme="dark"] .theme-toggle .i-moon{display:block}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme-toggle .i-sun{display:none}
  :root:not([data-theme="light"]) .theme-toggle .i-moon{display:block}
}
/* mobile menu */
.menu-toggle .i-close{display:none}
.menu-toggle[aria-expanded="true"] .i-menu{display:none}
.menu-toggle[aria-expanded="true"] .i-close{display:block}
@media(min-width:768px){.menu-toggle{display:none}}
.mobile-nav{border-top:1px solid var(--border);background:var(--bg);padding:12px 0 20px}
.mobile-nav[hidden]{display:none}
@media(min-width:768px){.mobile-nav{display:none!important}}
.mobile-nav ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.mobile-nav a{display:flex;align-items:center;gap:10px;min-height:48px;padding:0 12px;border-radius:10px;color:var(--text);font-weight:500;text-decoration:none}
.mobile-nav a:hover,.mobile-nav a[aria-current="page"]{background:var(--surface-2)}
.mobile-nav .mobile-topics{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}
.mobile-nav .mobile-label{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);padding:8px 12px}
.mobile-nav .dot-cat{width:10px;height:10px;border-radius:3px;background:var(--cat)}

/* reading progress */
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:60;background:transparent;pointer-events:none}
.progress span{display:block;height:100%;width:100%;background:var(--accent);transform-origin:0 50%;transform:scaleX(0)}

/* ---------- Buttons & chips ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:999px;font:600 15px/1 var(--font);
  text-decoration:none;cursor:pointer;border:1px solid transparent;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),transform .15s var(--ease)}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-primary:hover{background:var(--accent-hover);color:var(--on-accent)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--border)}
.btn-ghost:hover{background:var(--surface-2);color:var(--text);border-color:var(--border-strong)}
.btn-sm{min-height:40px;padding:0 16px;font-size:14px}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--accent-text);background:var(--accent-soft);padding:4px 10px;border-radius:999px;text-decoration:none;white-space:nowrap}
a.chip:hover{color:var(--accent-hover);background:color-mix(in srgb,var(--accent) 18%,transparent)}
.chip .i{width:14px;height:14px}

/* ---------- Hero ---------- */
.hero{padding:56px 0 48px;border-bottom:1px solid var(--border)}
@media(min-width:1024px){.hero{padding:88px 0 76px}}
.hero-grid{display:grid;gap:48px;align-items:center}
@media(min-width:1024px){.hero-grid{grid-template-columns:1.15fr .85fr}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:500 13px/1 var(--mono);color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:20px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px color-mix(in srgb,var(--ok) 20%,transparent)}
.hero h1{font-size:clamp(38px,6vw,64px);font-weight:700;letter-spacing:-.035em;max-width:13ch}
.accent{color:var(--accent-text)}
.lead{font-size:18px;color:var(--text-2);max-width:58ch;margin-top:20px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero-stats{display:flex;flex-wrap:wrap;gap:8px 24px;margin:32px 0 0;padding:0;list-style:none}
.hero-stats li{display:flex;align-items:baseline;gap:8px;color:var(--muted);font-size:14px}
.hero-stats b{font:600 22px/1 var(--font);color:var(--text);letter-spacing:-.02em}
.hero-art{display:none}
@media(min-width:1024px){.hero-art{display:block}}
.term{background:#0B0B0F;border:1px solid #27272A;border-radius:var(--radius);box-shadow:var(--shadow-hover);overflow:hidden}
.term-bar{display:flex;gap:6px;padding:12px 14px;border-bottom:1px solid #27272A}
.term-bar span{width:10px;height:10px;border-radius:50%;background:#3F3F46}
.term pre{margin:0;padding:22px 20px;font:500 14px/1.9 var(--mono);color:#E4E4E7;white-space:pre-wrap}
.c-mute{color:#71717A}.c-acc{color:#A5B4FC}.c-ok{color:#4ADE80}

/* ---------- Sections ---------- */
.section{padding:64px 0}
@media(min-width:1024px){.section{padding:88px 0}}
.section-alt{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px 24px;margin-bottom:28px}
.section-head h2{font-size:clamp(24px,3vw,32px);font-weight:700}
.section-head p{color:var(--muted);margin-top:6px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:15px;text-decoration:none;min-height:44px}
.link-arrow .i{transition:transform .2s var(--ease)}
.link-arrow:hover .i{transform:translateX(3px)}
.section-foot{display:flex;justify-content:center;margin-top:40px}

/* ---------- Cover art (per category) ---------- */
.cover{position:relative;overflow:hidden;isolation:isolate;
  background:
    radial-gradient(120% 140% at 0% 0%,color-mix(in srgb,var(--cat) var(--cover-mix),var(--surface)) 0%,color-mix(in srgb,var(--cat) var(--cover-mix-2),var(--surface)) 70%);
  color:var(--cat)}
.cover::before{content:"";position:absolute;inset:0;z-index:-1;opacity:.55;
  background-image:radial-gradient(color-mix(in srgb,var(--cat) 35%,transparent) 1px,transparent 1.2px);background-size:14px 14px;
  -webkit-mask-image:linear-gradient(115deg,transparent 25%,#000 90%);mask-image:linear-gradient(115deg,transparent 25%,#000 90%)}
.cover-tile{display:grid;place-items:center;width:48px;height:48px;border-radius:13px;background:var(--cat);color:#fff;
  box-shadow:0 8px 20px -6px color-mix(in srgb,var(--cat) 70%,transparent)}
.cover-tile .i{width:24px;height:24px}
.cover-mark{position:absolute;right:20px;bottom:12px;width:80px;height:80px;opacity:.16;color:var(--cat);stroke-width:1.5;pointer-events:none}
.cover-label{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.07em;color:var(--text-2)}

/* ---------- Post cards ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.post-grid{display:grid;gap:20px}
@media(min-width:768px){.post-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.post-grid{grid-template-columns:repeat(3,1fr)}}
.post-card{position:relative;display:flex;flex-direction:column;overflow:hidden;transition:border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease)}
.post-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.post-card:focus-within{border-color:var(--border-strong)}
.post-card .cover{order:-1;height:104px;display:flex;align-items:center;padding:0 24px;border-bottom:1px solid var(--border)}
.post-card-body{padding:20px 24px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.post-card :is(h2,h3){font-size:19px;font-weight:600;line-height:1.3}
.post-card :is(h2,h3) a{color:var(--text);text-decoration:none}
.post-card :is(h2,h3) a:hover{color:var(--text)}
.post-card p{color:var(--text-2);font-size:15px;line-height:1.6}
.stretched::after{content:"";position:absolute;inset:0;border-radius:var(--radius)}
.stretched:focus-visible{outline:none}
.stretched:focus-visible::after{outline:2px solid var(--accent);outline-offset:3px}
.post-card-meta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);min-width:0}
.post-card-meta > *{flex:none}
.meta-badge{display:inline-flex;align-items:center;gap:4px;color:var(--muted)}
.meta-badge .i{width:14px;height:14px}
.post-card[hidden]{display:none}

/* featured */
.post-card.featured .cover{height:auto;min-height:168px;flex-direction:column;align-items:flex-start;justify-content:center;gap:14px;padding:24px}
@media(min-width:768px){
  .post-card.featured{grid-column:1/-1;display:grid;grid-template-columns:1.35fr 1fr}
  .post-card.featured .post-card-body{padding:36px;gap:14px;justify-content:center;order:0}
  .post-card.featured .cover{order:1;height:auto;min-height:280px;border-bottom:0;border-left:1px solid var(--border);
    flex-direction:column;align-items:flex-start;justify-content:space-between;padding:32px}
  .post-card.featured :is(h2,h3){font-size:clamp(24px,2.6vw,32px);font-weight:700;letter-spacing:-.025em}
  .post-card.featured p{font-size:17px;max-width:56ch}
  .post-card.featured .cover-mark{width:150px;height:150px;right:28px;bottom:28px}
}
.featured .cover-tile{width:60px;height:60px;border-radius:16px}
.featured .cover-tile .i{width:30px;height:30px}
.featured-tldr{display:none}
@media(min-width:768px){
  .featured-tldr{display:block;position:relative;max-width:34ch;font-size:15px;line-height:1.55;color:var(--text);
    background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;z-index:1;
    -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
  .featured-tldr .cover-label{display:block;margin-bottom:8px}
}
.read-more{margin-top:auto;padding-top:4px;display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--accent-text)}

/* ---------- Topics ---------- */
.topic-grid{list-style:none;margin:0;padding:0;display:grid;gap:16px}
@media(min-width:640px){.topic-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.topic-grid{grid-template-columns:repeat(3,1fr)}}
.topic{position:relative;display:flex;gap:16px;padding:20px;overflow:hidden;box-shadow:none;transition:border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease)}
.topic:hover{border-color:var(--border-strong);box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.topic .cover-tile{flex:none;width:44px;height:44px;border-radius:12px}
.topic .cover-tile .i{width:22px;height:22px}
.topic h3{font-size:17px;font-weight:600}
.topic h3 a{color:var(--text);text-decoration:none}
.topic p{color:var(--muted);font-size:14px;margin-top:4px;line-height:1.55}
.topic-count{display:inline-block;margin-top:10px;font:500 12px/1 var(--mono);color:var(--muted);text-transform:uppercase;letter-spacing:.05em}

/* ---------- Subscribe band ---------- */
.subscribe{display:grid;gap:20px;align-items:center;padding:28px;border-radius:calc(var(--radius) + 4px);
  background:linear-gradient(135deg,var(--accent-soft),color-mix(in srgb,var(--accent-soft) 40%,var(--surface)));border:1px solid color-mix(in srgb,var(--accent) 22%,transparent)}
@media(min-width:900px){.subscribe{grid-template-columns:1fr auto;padding:36px 40px}}
.subscribe h2{font-size:clamp(22px,2.6vw,28px);font-weight:700}
.subscribe p{color:var(--text-2);margin-top:8px;max-width:56ch}
.subscribe-actions{display:flex;flex-wrap:wrap;gap:10px}
.subscribe-form{display:flex;flex-wrap:wrap;gap:10px;width:100%}
.subscribe-form label{flex-basis:100%;font-size:14px;font-weight:600;color:var(--text)}
.input{flex:1;min-width:220px;min-height:46px;padding:0 16px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);font:400 16px var(--font)}
.input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- About ---------- */
.about-grid{display:grid;gap:40px;align-items:start}
@media(min-width:900px){.about-grid{grid-template-columns:1.3fr 1fr}}
.about h2{font-size:clamp(24px,3vw,32px)}
.checks{list-style:none;padding:0;margin:28px 0 0;display:grid;gap:12px}
.checks li{display:flex;align-items:center;gap:12px;color:var(--text-2)}
.checks .i{color:var(--ok);width:20px;height:20px}

/* ---------- Author ---------- */
.author{display:flex;gap:16px;align-items:flex-start;padding:24px}
.avatar{flex:none;width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font:700 22px/1 var(--font);color:var(--on-accent);
  background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 55%,#EC4899))}
.avatar.sm{width:32px;height:32px;border-radius:10px;font-size:14px}
.author-name{font-weight:700;font-size:17px;color:var(--text)}
.author-role{font-size:14px;color:var(--muted);margin-top:2px}
.author-bio{font-size:15px;color:var(--text-2);margin-top:10px;line-height:1.6}
.author-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.byline{display:inline-flex;align-items:center;gap:10px;color:var(--text);font-weight:600;font-size:14px}

/* ---------- Listing pages ---------- */
.page-head{padding:40px 0 32px;border-bottom:1px solid var(--border)}
@media(min-width:1024px){.page-head{padding:56px 0 40px}}
.page-head h1{font-size:clamp(32px,5vw,48px);font-weight:700;letter-spacing:-.03em;margin-top:12px}
.page-head .lead{margin-top:12px}
.topic-hero{border-bottom:1px solid var(--border)}
.topic-hero .container{display:flex;flex-wrap:wrap;gap:20px;align-items:center;padding-top:40px;padding-bottom:40px}
@media(min-width:1024px){.topic-hero .container{padding-top:56px;padding-bottom:56px}}
.topic-hero .cover-tile{width:64px;height:64px;border-radius:18px}
.topic-hero .cover-tile .i{width:32px;height:32px}
.topic-hero .cover-mark{width:180px;height:180px;right:6%;bottom:24px}
.toolbar{display:flex;flex-direction:column;gap:16px;margin-bottom:28px}
.search{position:relative;max-width:520px}
.search .i{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}
.search .input{width:100%;padding-left:44px}
.filters{display:flex;flex-wrap:wrap;gap:8px}
.filter{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 16px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);font:500 14px/1 var(--font);cursor:pointer;text-decoration:none;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease)}
.filter:hover{border-color:var(--border-strong);color:var(--text)}
.filter.is-active,.filter[aria-current="page"]{background:var(--text);color:var(--bg);border-color:var(--text)}
.filter .dot-cat{width:8px;height:8px;border-radius:2px;background:var(--cat)}
.result-count{font-size:14px;color:var(--muted)}
.empty{display:none;text-align:center;padding:56px 20px;border:1px dashed var(--border-strong);border-radius:var(--radius);color:var(--text-2)}
.empty.is-visible{display:block}
.empty p{margin:8px 0 20px}
.load-more{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:40px}
.load-more[hidden]{display:none}

/* ---------- Article ---------- */
.article{max-width:760px;padding-top:32px;padding-bottom:40px}
@media(min-width:768px){.article{padding-top:48px}}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--muted);margin-bottom:28px}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--text)}
.article-head h1{font-size:clamp(30px,5vw,46px);font-weight:700;letter-spacing:-.03em;margin:16px 0 18px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;font-size:14px;color:var(--muted)}
.lang-link{display:inline-flex;align-items:center;gap:6px;font-weight:500}
.lang-link .i{width:15px;height:15px}
.tldr{margin:32px 0;padding:20px 22px;border-radius:var(--radius);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 25%,transparent)}
.tldr-label{font:600 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--accent-text);margin-bottom:10px}
.tldr p:last-child{font-size:17px;color:var(--text)}

/* video: click-to-load facade, vertical reels at 9:16 */
.video{margin:0 auto 40px;width:100%;max-width:360px}
.video-frame{position:relative;width:100%;aspect-ratio:9/16;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border)}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-facade{position:absolute;inset:0;width:100%;height:100%;border:0;background:transparent;overflow:hidden;padding:24px;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;font:inherit;color:var(--text)}
.video-facade .cover-mark{width:140px;height:140px;right:24px;bottom:24px}
.play{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--on-accent);box-shadow:0 10px 30px -8px color-mix(in srgb,var(--accent) 70%,transparent);transition:transform .2s var(--ease)}
.play .i{width:30px;height:30px;fill:currentColor;stroke:none;margin-left:4px}
.video-facade:hover .play{transform:scale(1.06)}
.video-facade:focus-visible{outline:2px solid var(--accent);outline-offset:-4px}
.video-title{font-weight:600;font-size:16px}
.video-sub{font-size:13px;color:var(--muted)}
.video figcaption{display:flex;justify-content:center;margin-top:10px;font-size:14px}
.video figcaption a{display:inline-flex;align-items:center;gap:6px;min-height:40px}
.video figcaption .i{width:15px;height:15px}
.video-link{margin:0 0 40px;padding:28px 20px;border:1px dashed var(--border-strong);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;background:var(--surface)}

/* prose */
.prose{font-size:17px;line-height:1.75;color:var(--text-2);min-width:0;max-width:100%}
.prose > *{min-width:0}
.prose h2{font-size:24px;font-weight:700;margin:44px 0 16px}
.prose h3{font-size:19px;font-weight:600;margin:32px 0 12px}
.prose p{margin:16px 0}
.prose ul,.prose ol{padding-left:22px;margin:16px 0}
.prose li{margin:10px 0}
.prose li::marker{color:var(--accent-text)}
.prose ol li::marker{font-weight:600}
.prose strong{color:var(--text);font-weight:600}
.prose em{color:var(--text)}
.prose code{font:500 .86em var(--mono);background:var(--code-bg);border:1px solid var(--border);padding:2px 6px;border-radius:6px;color:var(--text)}
.prose pre{margin:20px 0;padding:18px 20px;background:#0B0B0F;color:#E4E4E7;border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto;font:500 14px/1.7 var(--mono);max-width:100%}
.prose pre code{background:none;border:none;padding:0;color:inherit;font-size:inherit}
.tldr code,.prose :not(pre)>code{overflow-wrap:anywhere;word-break:break-word}
.tldr p{overflow-wrap:anywhere}
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin:20px 0}
table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.6}
th,td{text-align:left;vertical-align:top;padding:14px 16px;border-bottom:1px solid var(--border)}
tr:last-child td{border-bottom:none}
th{font-size:13px;font-weight:600;color:var(--muted);background:var(--surface-2);text-transform:uppercase;letter-spacing:.04em}
td:first-child{min-width:150px}
@media(max-width:600px){
  .table-wrap table,.table-wrap tbody,.table-wrap tr,.table-wrap td{display:block;width:100%}
  .table-wrap thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .table-wrap tr{padding:14px 16px;border-bottom:1px solid var(--border)}
  .table-wrap tr:last-child{border-bottom:none}
  .table-wrap td{padding:0;border:none;min-width:0}
  .table-wrap td:first-child{margin-bottom:4px;color:var(--text)}
  .table-wrap td[data-label]:not(:first-child)::before{content:attr(data-label);display:block;font:600 11px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-top:8px}
  .table-wrap td[data-label=""]::before{display:none}
}
.callout{margin:28px 0;padding:18px 20px;border-left:3px solid var(--accent);background:var(--surface);border-radius:0 var(--radius-sm) var(--radius-sm) 0;border-top:1px solid var(--border);border-right:1px solid var(--border);border-bottom:1px solid var(--border)}
.callout p{margin:0}
.callout-title{font-weight:600;color:var(--text);margin-bottom:6px!important}
.links{margin-top:28px;font-size:15px}

.article-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-top:48px;padding-top:28px;border-top:1px solid var(--border)}
.share{display:flex;flex-wrap:wrap;gap:8px}
.article-author{margin-top:32px}

/* sources */
.sources{margin-top:40px;padding:20px 22px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}
.sources h2{font:600 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:12px}
.sources ol{margin:0;padding-left:20px;display:grid;gap:8px;font-size:15px;line-height:1.5}
.sources li::marker{color:var(--muted)}
.sources a{overflow-wrap:anywhere}

/* prev / next */
.pager{display:grid;gap:12px;margin-top:32px}
@media(min-width:640px){.pager{grid-template-columns:1fr 1fr}}
.pager a{position:relative;display:flex;flex-direction:column;gap:6px;padding:18px 20px;text-decoration:none;color:var(--text);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.pager a:hover{border-color:var(--border-strong);box-shadow:var(--shadow-hover);color:var(--text)}
.pager .next{text-align:right;align-items:flex-end}
@media(min-width:640px){.pager .next:only-child{grid-column:2}}
.pager-label{display:inline-flex;align-items:center;gap:6px;font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.pager-title{font-weight:600;line-height:1.4}

.related{padding:56px 0 72px;border-top:1px solid var(--border);background:var(--surface)}
.related .post-card{box-shadow:none}

/* 404 */
.notfound{padding:96px 20px;max-width:760px}
.notfound h1{font-size:clamp(32px,5vw,48px)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);padding:48px 0 32px;background:var(--surface)}
.footer-grid{display:grid;gap:32px}
@media(min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr}}
.footer-col h2{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:14px}
.footer-col ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.footer-col a{color:var(--text-2);text-decoration:none;font-size:15px;display:inline-flex;align-items:center;gap:8px;min-height:32px}
.footer-col a:hover{color:var(--text)}
.footer-col .i{width:15px;height:15px}
.site-footer p{margin-top:8px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;margin-top:36px;padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom p{margin:0}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}
  .post-card:hover,.topic:hover{transform:none}
}