/* ═══════════════════════════════════════════════════════════
   Inthread Blog — shares the homepage design language
   (Fraunces / Inter / JetBrains Mono · light + dark themes)
═══════════════════════════════════════════════════════════ */

/* ═══════════════ TOKENS ═══════════════ */
:root{
  --bg:#0c0c11; --bg-1:#13131a; --bg-2:#1a1a23; --bg-3:#23232f;
  --fg:#ececf2; --fg-dim:#a8a8b8; --fg-mute:#6e6e80; --fg-strong:#ffffff;
  --line:rgba(255,255,255,.08); --line-strong:rgba(255,255,255,.16);
  --accent:#7c6cf0; --accent-bright:#a89cf7; --accent-soft:rgba(124,108,240,.1); --accent-border:rgba(124,108,240,.25);
  --blue:#4da3ff; --green:#34c759;
  --display:'Fraunces',Georgia,serif;
  --body:'Inter',-apple-system,BlinkMacSystemFont,'Helvetica Neue',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --max:760px;
}
[data-theme="light"]{
  --bg:#fafafa; --bg-1:#ffffff; --bg-2:#f3f3f5; --bg-3:#e8e8ec;
  --fg:#15151a; --fg-dim:#4a4a55; --fg-mute:#8888a0; --fg-strong:#000000;
  --line:rgba(0,0,0,.08); --line-strong:rgba(0,0,0,.16);
  --accent:#5b4fd1; --accent-bright:#7c6cf0; --accent-soft:rgba(91,79,209,.07); --accent-border:rgba(91,79,209,.18);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--fg);font-family:var(--body);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;transition:background .25s,color .25s;padding-top:60px}
a{color:var(--accent-bright);text-decoration:none}
a:hover{text-decoration:underline}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--accent-soft);color:var(--accent-bright)}
img{max-width:100%}

/* ═══════════════ SCROLL PROGRESS ═══════════════ */
.sp{position:fixed;top:0;left:0;height:2px;background:var(--accent);width:0%;z-index:300;transition:width .08s linear}

/* ═══════════════ NAV ═══════════════ */
nav.main{position:fixed;inset:0 0 auto 0;height:60px;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,env(safe-area-inset-left)) 0 max(20px,env(safe-area-inset-right));background:rgba(12,12,17,.7);backdrop-filter:blur(20px) saturate(160%);-webkit-backdrop-filter:blur(20px) saturate(160%);border-bottom:1px solid var(--line);transition:background .25s}
[data-theme="light"] nav.main{background:rgba(250,250,250,.78)}
.logo{display:inline-flex;align-items:center;gap:9px;font-family:var(--display);font-size:20px;font-weight:700;font-style:italic;letter-spacing:-.02em;color:var(--fg-strong)}
.logo:hover{text-decoration:none}
.logo em{color:var(--accent);font-style:italic}
.mark{position:relative;width:20px;height:20px;flex-shrink:0}
.mark span{position:absolute;display:block;border-radius:50%;border:2.4px solid var(--accent)}
.mark span:first-child{width:13px;height:13px;top:0;left:0}
.mark span:last-child{width:9px;height:9px;bottom:0;right:0}
.nav-right{display:flex;align-items:center;gap:8px}
.theme-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--fg);font-size:14px;background:transparent;transition:background .15s}
.theme-btn:hover{background:var(--bg-2)}
.btn-ghost{display:inline-flex;align-items:center;height:36px;padding:0 14px;border-radius:18px;font-size:13px;font-weight:500;color:var(--fg-dim);transition:color .15s,background .15s}
.btn-ghost:hover{color:var(--fg-strong);background:var(--bg-2);text-decoration:none}
.btn-primary{display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:18px;font-size:13px;font-weight:600;background:var(--fg-strong);color:var(--bg);transition:transform .15s,filter .15s}
.btn-primary:hover{transform:translateY(-1px);filter:brightness(.92);text-decoration:none}

/* ═══════════════ LAYOUT ═══════════════ */
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
main.wrap{padding-top:24px;padding-bottom:24px}
.crumbs{font-size:13px;color:var(--fg-mute);margin:20px 0 8px;font-family:var(--mono)}
.crumbs a{color:var(--fg-mute)}
.crumbs a:hover{color:var(--accent-bright)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--accent-bright);text-transform:uppercase;margin:0 0 16px}
.eyebrow::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);flex-shrink:0}

h1,h2,h3,h4{font-family:var(--display);font-weight:500;letter-spacing:-.025em;color:var(--fg-strong);line-height:1.1}
h1{font-size:clamp(32px,5vw,46px);line-height:1.08;margin:0 0 16px}
h2{font-size:clamp(26px,3.6vw,34px);margin:52px 0 16px}
h3{font-size:21px;font-weight:600;line-height:1.3;margin:32px 0 10px}
.meta{color:var(--fg-mute);font-size:14px;margin-bottom:36px;font-family:var(--mono)}
p{margin:0 0 18px;color:var(--fg-dim)}
p strong{color:var(--fg)}
main.wrap > p,.tldr p,.callout p,.faq p{color:var(--fg-dim)}
em.it{font-style:italic;font-weight:700;color:var(--accent-bright)}

/* ═══════════════ TL;DR ═══════════════ */
.tldr{background:var(--bg-1);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:14px;padding:22px 26px;margin:0 0 40px}
.tldr strong{color:var(--accent-bright);display:block;margin-bottom:8px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.tldr p{margin:0;font-size:17px;color:var(--fg)}

/* ═══════════════ CALLOUT ═══════════════ */
.callout{background:linear-gradient(150deg,var(--accent-soft) 0%,var(--bg-1) 75%);border:1px solid var(--accent-border);border-radius:16px;padding:24px 26px;margin:36px 0}
.callout p{margin:0;color:var(--fg)}

/* ═══════════════ TABLES ═══════════════ */
table{width:100%;border-collapse:collapse;margin:28px 0;font-size:15.5px;background:var(--bg-1);border:1px solid var(--line);border-radius:14px;overflow:hidden}
th,td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top;color:var(--fg-dim)}
th{color:var(--accent-bright);font-size:12px;text-transform:uppercase;letter-spacing:.05em;font-weight:700;background:var(--bg-2)}
tr:last-child td{border-bottom:none}
td:first-child{color:var(--fg);font-weight:500}

/* ═══════════════ NUMBERED STEPS ═══════════════ */
ol.steps,ol.how{counter-reset:s;list-style:none;padding:0;margin:28px 0}
ol.steps li,ol.how li{counter-increment:s;position:relative;padding:14px 0 14px 52px;border-bottom:1px solid var(--line);color:var(--fg-dim)}
ol.steps li:last-child,ol.how li:last-child{border-bottom:none}
ol.steps li::before,ol.how li::before{content:counter(s);position:absolute;left:0;top:11px;width:34px;height:34px;background:var(--accent-soft);color:var(--accent-bright);border:1px solid var(--accent-border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;font-family:var(--mono)}

/* ═══════════════ MODEL CARDS (model comparison post) ═══════════════ */
.model{display:grid;grid-template-columns:1fr;gap:0;margin:28px 0}
.model-card{background:var(--bg-1);border:1px solid var(--line);border-radius:16px;padding:22px 26px;margin-bottom:16px;transition:border-color .2s}
.model-card:hover{border-color:var(--accent-border)}
.model-card h3{margin:0 0 8px}
.model-card p{margin:0}
.tag{display:inline-block;font-size:12px;font-weight:600;color:var(--accent-bright);background:var(--accent-soft);border:1px solid var(--accent-border);padding:3px 12px;border-radius:100px;margin-bottom:12px;letter-spacing:.02em}

/* ═══════════════ SCENARIOS (apple watch post) ═══════════════ */
.scenarios{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:28px 0}
.scenarios div{background:var(--bg-1);border:1px solid var(--line);border-radius:14px;padding:18px 20px;font-size:15px;color:var(--fg-dim)}
.scenarios strong{color:var(--accent-bright);display:block;margin-bottom:5px;font-weight:600}

/* ═══════════════ BEFORE / AFTER BUBBLES (hard texts post) ═══════════════ */
.ba{background:var(--bg-1);border:1px solid var(--line);border-radius:18px;padding:10px 24px 20px;margin:20px 0}
.bubble{max-width:85%;padding:11px 16px;border-radius:18px;margin:12px 0;font-size:15.5px;line-height:1.5}
.incoming{background:var(--bg-3);color:var(--fg);border-bottom-left-radius:5px}
.before{background:rgba(255,115,115,.12);border:1px dashed rgba(255,115,115,.4);color:#e89b9b;border-bottom-right-radius:5px;margin-left:auto}
[data-theme="light"] .before{color:#b4434a}
.after{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;border-bottom-right-radius:5px;margin-left:auto}
.lbl{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--fg-mute);margin:16px 0 2px;font-weight:600}
.prompt{font-size:14px;color:var(--fg-mute);border-left:2px solid var(--accent-border);padding-left:14px;margin:12px 0 4px}
.prompt code{color:var(--accent-bright);font-family:var(--mono);font-size:13px}

/* ═══════════════ FAQ ═══════════════ */
.faq{margin-top:24px}
.faq h2{margin-bottom:8px}
.faq h3{margin:28px 0 6px;font-size:20px}

/* ═══════════════ RELATED ═══════════════ */
.related{background:var(--bg-1);border:1px solid var(--line);border-radius:16px;padding:26px;margin:52px 0}
.related h2{margin:0 0 14px;font-size:20px}
.related ul{margin:0;padding-left:18px}
.related li{margin:9px 0;color:var(--fg-dim)}

/* ═══════════════ CTA ═══════════════ */
.cta{text-align:center;background:radial-gradient(ellipse at center,var(--accent-soft) 0%,var(--bg-1) 75%);border:1px solid var(--accent-border);border-radius:20px;padding:48px 28px;margin:56px 0}
.cta h2{margin:0 0 12px;font-size:clamp(26px,4vw,34px);color:var(--fg-strong)}
.cta p{color:var(--fg-dim);margin:0 0 26px;max-width:480px;margin-left:auto;margin-right:auto}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 28px;border-radius:24px;font-size:15px;font-weight:600;background:var(--accent);color:#fff;transition:transform .15s,filter .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:0 10px 28px rgba(124,108,240,.25);text-decoration:none}

/* ═══════════════ BLOG INDEX ═══════════════ */
.hero{text-align:center;padding:48px 0 12px}
.hero h1{font-size:clamp(36px,6vw,56px);margin:0 0 18px}
.hero p{color:var(--fg-dim);max-width:580px;margin:0 auto;font-size:18px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:44px 0}
.card{display:block;background:var(--bg-1);border:1px solid var(--line);border-radius:18px;padding:28px;color:inherit;transition:border-color .2s,transform .2s}
.card:hover{border-color:var(--accent-border);transform:translateY(-2px);text-decoration:none}
.card .tag{margin-bottom:14px}
.card h2{font-size:21px;line-height:1.25;margin:0 0 10px}
.card p{color:var(--fg-dim);font-size:15px;margin:0}
.card.feature{grid-column:1 / -1}
.card.feature h2{font-size:27px}

/* ═══════════════ FOOTER ═══════════════ */
footer{padding:36px 32px;border-top:1px solid var(--line);background:var(--bg-1);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:56px}
footer .logo{font-size:18px}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{font-size:13px;color:var(--fg-mute)}
.foot-links a:hover{color:var(--fg);text-decoration:none}
.foot-copy{font-size:12px;color:var(--fg-mute)}

/* ═══════════════ RESPONSIVE ═══════════════ */
@media(max-width:560px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .scenarios,.grid{grid-template-columns:1fr}
  .bubble{max-width:92%}
  footer{flex-direction:column;text-align:center}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}