:root{
  --bg:#06070b;--bg-2:#0b0d14;--ink:#e9ecf5;--ink-2:#a3a9ba;--ink-3:#5d6375;
  --line:rgba(233,236,245,.09);--glow:#9fb4ff;
  --display:"Space Grotesk","IBM Plex Sans Thai",system-ui,sans-serif;
  --body:Inter,"IBM Plex Sans Thai",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --gutter:clamp(20px,5vw,48px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink-2);font:300 16px/1.75 var(--body);-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(60vw 40vw at 85% 0%,var(--neb1),transparent 60%),radial-gradient(50vw 40vw at 0% 100%,var(--neb2),transparent 60%)}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
::selection{background:var(--glow);color:var(--bg)}
header,main,footer{position:relative;z-index:1}
.label{font:400 11px/1.6 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3)}

/* Nav */
.nav{position:sticky;top:0;z-index:20;background:var(--nav-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1120px;margin:0 auto;padding:0 var(--gutter)}
.mark{font:500 15px var(--display);color:var(--ink);letter-spacing:.02em}
.mark span{color:var(--ink-3)}
.nav ul{display:flex;gap:clamp(16px,3vw,36px);list-style:none}
.nav ul a{font-size:13px;color:var(--ink-2);transition:color .2s}
.nav ul a:hover,.nav ul a[aria-current]{color:var(--ink)}

/* Blog index */
.wrap{max-width:1120px;margin:0 auto;padding:0 var(--gutter)}
.page-head{padding:clamp(64px,10vw,120px) 0 clamp(32px,5vw,56px)}
.page-head h1{font:300 clamp(40px,7vw,88px)/1 var(--display);color:var(--ink);letter-spacing:-.035em;margin:20px 0 22px}
.page-head p{max-width:34em}
.posts{list-style:none;border-top:1px solid var(--line);margin-bottom:clamp(80px,12vw,160px)}
.posts li{border-bottom:1px solid var(--line)}
.posts a{display:grid;grid-template-columns:180px 1fr auto;gap:40px;align-items:baseline;padding:30px 0;transition:background .3s}
.posts a:hover{background:linear-gradient(90deg,transparent,rgba(159,180,255,.03),transparent)}
.posts time{font:400 12px var(--mono);color:var(--ink-3);letter-spacing:.04em}
.posts h2{font:400 clamp(20px,2.2vw,26px)/1.35 var(--display);color:var(--ink);margin-bottom:8px;transition:transform .35s}
.posts a:hover h2{transform:translateX(6px)}
.posts p{font-size:14.5px;max-width:40em}
.posts .arrow{color:var(--ink-3)}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tags span{font:400 11px var(--mono);color:var(--ink-3);border:1px solid var(--line);border-radius:999px;padding:2px 10px}

/* Article */
.article{max-width:720px;margin:0 auto;padding:clamp(56px,10vw,120px) var(--gutter) 40px}
.crumb{display:inline-flex;gap:10px;align-items:center;margin-bottom:28px}
.crumb a:hover{color:var(--ink)}
.article h1{font:400 clamp(32px,5.4vw,56px)/1.15 var(--display);color:var(--ink);letter-spacing:-.02em;margin-bottom:24px}
.meta{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center;padding-bottom:32px;border-bottom:1px solid var(--line);margin-bottom:40px}
.meta .by{font-size:14px;color:var(--ink)}
.cover{margin:0 calc(-1 * min(80px,6vw)) 44px}
.cover img,.prose figure img{width:100%;border-radius:4px;background:var(--bg-2)}
.prose{font-size:18px;line-height:1.95;color:var(--prose)}
.prose[lang=th]{font-size:18.5px;line-height:2}
.prose p{margin-bottom:1.35em}
.prose figure{margin:2.2em 0}
.prose figcaption{font-size:13px;color:var(--ink-3);margin-top:10px;text-align:center}
.prose strong{font-weight:500;color:var(--ink)}
.prose h2{font:500 clamp(22px,2.6vw,28px)/1.35 var(--display);color:var(--ink);margin:2em 0 .7em}
.prose .key{display:block;font:500 1.05em/1.6 var(--display);color:var(--ink);margin-bottom:.35em}
.prose .key b{display:inline-grid;place-items:center;width:1.9em;height:1.9em;margin-right:.55em;border:1px solid var(--glow);border-radius:50%;font:500 .85em var(--mono);color:var(--glow);vertical-align:.1em}
.prose blockquote{margin:2.2em 0;padding:4px 0 4px 24px;border-left:2px solid var(--glow);font:300 1.12em/1.85 var(--body);color:var(--ink)}
.prose a{color:var(--glow);border-bottom:1px solid rgba(159,180,255,.35)}
.prose a:hover{border-color:var(--glow)}
.refs{margin-top:2.6em;padding-top:1.6em;border-top:1px solid var(--line);font-size:15px;line-height:1.85}
.refs h2{font:400 11px/1.6 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3);margin:0 0 1em}
.refs ol{padding-left:1.2em}
.refs li{margin-bottom:.8em}
.refs a,.prose a{overflow-wrap:anywhere}
.source{margin-top:48px;padding:22px 24px;border:1px solid var(--line);border-radius:6px;font-size:14px}
.source a{color:var(--ink);border-bottom:1px solid var(--line)}
.source a:hover{border-color:var(--glow)}
.back{display:inline-flex;gap:10px;margin:56px 0 0;font-size:14px;color:var(--ink);border-bottom:1px solid var(--line);padding-bottom:6px}
.back:hover{border-color:var(--ink)}

footer{padding:40px 0 48px;border-top:1px solid var(--line);margin-top:80px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px}
footer a:hover{color:var(--ink)}

@media (max-width:760px){
  .posts a{grid-template-columns:1fr;gap:6px;position:relative;padding-right:28px}
  .posts .arrow{position:absolute;right:0;top:30px}
  .cover{margin-left:0;margin-right:0}
  .prose,.prose[lang=th]{font-size:17px}
  .nav ul{gap:16px}
  .mark span{display:none}
}
@media (max-width:640px){.nav ul li.hide-sm{display:none}.nav ul a{font-size:12px}.nav ul{gap:14px}}

/* ---------- Blog index: featured + cards ---------- */
.feature{margin-bottom:clamp(56px,8vw,96px)}
.feature-link{display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(28px,4vw,56px);align-items:center;padding:clamp(14px,1.6vw,20px);border:1px solid var(--line);border-radius:14px;background:linear-gradient(135deg,var(--card-tint),rgba(255,255,255,.01) 45%,transparent);transition:border-color .4s,transform .4s,box-shadow .4s}
.feature-link:hover{border-color:rgba(159,180,255,.35);transform:translateY(-3px);box-shadow:0 24px 60px -30px var(--shadow)}
.thumb{position:relative;aspect-ratio:16/11;overflow:hidden;border-radius:10px;background:var(--bg-2)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s cubic-bezier(.2,.7,.2,1),filter .6s;filter:saturate(1.05) contrast(1.05)}
.thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(6,7,11,.55));pointer-events:none}
.feature-link:hover .thumb img,.card:hover .thumb img{transform:scale(1.05);filter:saturate(1.2) contrast(1.08)}
.badge{position:absolute;top:14px;left:14px;z-index:1;font:500 10.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--bg);background:var(--glow);padding:7px 10px;border-radius:999px}
.feature-body{padding:6px clamp(4px,1.4vw,18px) 6px 0}
.meta-line{display:flex;flex-wrap:wrap;gap:6px 14px;font:400 12px var(--mono);letter-spacing:.04em;color:var(--ink-3);margin-bottom:16px}
.meta-line span::before{content:"·";margin-right:14px;color:var(--ink-3)}
.feature h2{font:400 clamp(28px,3.4vw,42px)/1.2 var(--display);color:var(--ink);letter-spacing:-.015em;margin-bottom:16px}
.excerpt{font-size:16px;line-height:1.85;color:var(--ink-2);max-width:32em}
.abc{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:22px 0 4px}
.abc li{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:4px 12px 4px 4px;background:var(--card-tint)}
.abc b{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:rgba(159,180,255,.14);color:var(--glow);font:500 11px var(--mono)}
.read{display:inline-flex;gap:10px;margin-top:26px;font-size:14px;color:var(--ink);border-bottom:1px solid var(--line);padding-bottom:6px;transition:gap .3s,border-color .3s}
.feature-link:hover .read{gap:16px;border-color:var(--glow)}

.more{margin-bottom:clamp(56px,8vw,96px)}
.more .label{margin-bottom:24px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.card a{display:block;height:100%;border:1px solid var(--line);border-radius:12px;padding:12px 12px 22px;transition:border-color .4s,transform .4s}
.card a:hover{border-color:rgba(159,180,255,.3);transform:translateY(-3px)}
.card .thumb{aspect-ratio:16/10;margin-bottom:18px}
.card h3{font:400 20px/1.35 var(--display);color:var(--ink);margin:8px 6px}
.card p{font-size:14px;margin:0 6px}

.follow{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:24px;padding:clamp(24px,3vw,36px);border:1px solid var(--line);border-radius:14px;margin-bottom:clamp(80px,12vw,140px);background:radial-gradient(120% 140% at 100% 0%,rgba(159,180,255,.07),transparent 60%)}
.follow-t{color:var(--ink);font:300 clamp(17px,1.8vw,20px)/1.5 var(--display);margin-top:8px;max-width:28em}
.follow-links{display:flex;flex-wrap:wrap;gap:12px}
.follow-links a{font-size:13.5px;color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:9px 16px;transition:border-color .3s,background .3s}
.follow-links a:hover{border-color:var(--glow);background:rgba(159,180,255,.06)}

@media (max-width:860px){
  .feature-link{grid-template-columns:1fr}
  .feature-body{padding:4px 6px 10px}
  .thumb{aspect-ratio:16/10}
}
@media (prefers-reduced-motion:reduce){
  .feature-link,.thumb img,.card a{transition:none}
  .feature-link:hover,.card a:hover{transform:none}
  .feature-link:hover .thumb img,.card:hover .thumb img{transform:none}
}

/* ---------- Theme: light / dark ---------- */
:root{--nav-bg:rgba(6,7,11,.72);--prose:#c4c9d6;--neb1:rgba(110,130,255,.08);--neb2:rgba(160,110,255,.05);--card-tint:rgba(159,180,255,.05);--shadow:rgba(110,130,255,.45)}
:root[data-theme=light]{
  --bg:#f5f4ef;--bg-2:#eae8e1;--ink:#14161d;--ink-2:#474d5c;--ink-3:#7c8190;
  --line:rgba(20,22,29,.11);--glow:#3a52d6;--nav-bg:rgba(245,244,239,.82);--prose:#262a35;
  --neb1:rgba(90,110,235,.09);--neb2:rgba(200,120,90,.06);--card-tint:rgba(58,82,214,.05);--shadow:rgba(58,82,214,.25)}
body{transition:background-color .35s,color .35s}
.theme-toggle{display:inline-grid;place-items:center;width:34px;height:34px;margin-left:clamp(10px,2vw,22px);border-radius:50%;border:1px solid var(--line);background:transparent;color:var(--ink-2);cursor:pointer;transition:color .2s,border-color .2s,background .2s}
.theme-toggle:hover{color:var(--ink);border-color:var(--ink-3)}
.theme-toggle:focus-visible{outline:2px solid var(--glow);outline-offset:2px}
.theme-toggle .i-sun{display:none}
:root[data-theme=dark] .theme-toggle .i-sun{display:block}
:root[data-theme=dark] .theme-toggle .i-moon{display:none}
:root[data-theme=light] ::selection{color:#fff}
.nav .wrap>nav{display:flex;align-items:center}
:root[data-theme=light] .badge{color:#fff}
:root[data-theme=light] .abc b{background:rgba(58,82,214,.12)}
:root[data-theme=light] .cover img,:root[data-theme=light] .prose figure img,:root[data-theme=light] .thumb{box-shadow:0 18px 40px -24px rgba(20,22,29,.35)}
:root[data-theme=light] .prose blockquote{color:var(--ink)}

/* ---------- Language switch ---------- */
.lang-switch{display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--line);border-radius:999px;margin-left:auto}
.lang-switch a{font:400 12.5px/1 var(--body);color:var(--ink-2);padding:7px 12px;border-radius:999px;transition:color .2s,background .2s}
.lang-switch a:hover{color:var(--ink)}
.lang-switch a[aria-current]{background:var(--ink);color:var(--bg);font-weight:500}
.meta .lang-switch{margin-left:auto}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
@media (max-width:520px){.meta .lang-switch{margin-left:0}}