/* ===== Base ===== */
:root{ --ink:#0f172a; --muted:#5b6785; --bg:#0b1020; --card:#0f1426;
  --a:#22d3ee; --b:#7c3aed; --c:#0ea5e9; --accent:#fbbf24; --radius:18px; --shadow:0 22px 60px rgba(2,6,23,.35); }
@media (prefers-color-scheme: light){ :root{ --ink:#0b1220; --muted:#6b7280; --bg:#f7f9ff; --card:#ffffff } }
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font:16px/1.7 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial;color:var(--ink);background:var(--bg)}
a{color:inherit;text-underline-offset:2px}
img{max-width:100%;height:auto;display:block}
.container{width:min(1120px,92vw);margin-inline:auto}
.content{padding:40px 0}
.with-sidebar{display:grid;grid-template-columns:1fr 320px;gap:32px}
@media (max-width: 960px){ .with-sidebar{grid-template-columns:1fr} }

/* Header/Footer */
.site-header{background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border-bottom:1px solid rgba(255,255,255,.14);position:sticky;top:0;backdrop-filter:blur(6px);z-index:50}
@media (prefers-color-scheme: light){.site-header{background:#fff;border-color:#e6eaf5}}
.site-header .container{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.menu{display:flex;gap:18px;flex-wrap:wrap}
.site-title{font-weight:800;text-decoration:none}
.site-footer{padding:28px 0;border-top:1px solid rgba(255,255,255,.14);color:var(--muted);background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00))}

/* ===== Hero ===== */
.kp-hero{position:relative;isolation:isolate;overflow:hidden;padding:clamp(32px,4vw,56px) 0;
  background:radial-gradient(1000px 480px at 10% 10%, rgba(34,211,238,.14), transparent 60%),
             radial-gradient(800px 420px at 90% 30%, rgba(124,58,237,.18), transparent 60%),
             linear-gradient(180deg, #0b1020 0%, #0a0e1a 100%);}
@media (prefers-color-scheme: light){
  .kp-hero{ background:
      radial-gradient(900px 420px at 10% 10%, rgba(34,211,238,.10), transparent 60%),
      radial-gradient(800px 420px at 90% 30%, rgba(124,58,237,.12), transparent 60%),
      linear-gradient(180deg,#f7f9ff,#eef2ff); }
}
.kp-hero__in{display:grid;align-items:center;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,48px)}
@media (max-width:980px){.kp-hero__in{grid-template-columns:1fr;gap:28px}}
.kp-hero__copy{background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.14); padding:clamp(18px, 3vw, 26px); border-radius:var(--radius); box-shadow:var(--shadow)}
@media (prefers-color-scheme: light){.kp-hero__copy{background:#fff;border-color:#e6eaf5}}
.kp-hero__pills{display:flex;flex-wrap:wrap;gap:8px 10px;margin-bottom:12px}
.pill{display:inline-flex;align-items:center;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);
  padding:.42rem .66rem;border-radius:999px;font-size:.82rem;color:#e6f9ff}
@media (prefers-color-scheme: light){.pill{color:#0b1220;background:#fff;border-color:#e6eaf5}}
.kp-hero__title{font-size:clamp(28px,5vw,48px);line-height:1.15;margin:.2em 0;font-weight:800}
.kp-hero__title .g{background:linear-gradient(90deg,var(--a),var(--b),var(--c));-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 0 24px rgba(34,211,238,.25)}
.kp-hero__lead{color:var(--muted);font-size:clamp(15px,2.1vw,18px);line-height:1.9}
.kp-hero__lead .hl{color:#fff;background:linear-gradient(90deg,rgba(34,211,238,.25),rgba(124,58,237,.18));padding:.05em .35em;border-radius:.4em}
@media (prefers-color-scheme: light){.kp-hero__lead .hl{color:#0b1220}}
.kp-hero__cta{display:flex;gap:12px;margin:18px 0 14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:.55em;padding:.9rem 1.15rem;border-radius:calc(var(--radius) + 6px);text-decoration:none;font-weight:700;letter-spacing:.02em;border:1px solid rgba(255,255,255,.14);box-shadow:0 10px 26px rgba(2,6,23,.25);color:#eef8ff}
.btn--primary{background:linear-gradient(180deg, rgba(34,211,238,.35), rgba(14,165,233,.25)) , #0b1220;outline:2px solid rgba(34,211,238,.22)}
.btn--line{background:linear-gradient(180deg, #16a34a, #16a34a) padding-box,linear-gradient(90deg, var(--a), var(--b)) border-box;border:2px solid transparent;color:#fff}
.kp-hero__trust{display:flex;gap:16px;flex-wrap:wrap;margin-top:10px;color:var(--muted);font-size:.95rem}
.kp-hero__trust li{list-style:none;padding-left:1.1em;position:relative}
.kp-hero__trust li::before{content:"✓";position:absolute;left:0;color:var(--a)}
.kp-hero__visual{position:relative;justify-self:center}
.kp-hero__visual img{width:clamp(260px,40vw,520px);height:auto;display:block;filter:drop-shadow(0 18px 48px rgba(2,6,23,.45))}
.kp-hero__visual .coin{position:absolute;display:grid;place-items:center;width:72px;height:72px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%, #fff3, transparent 40%), linear-gradient(180deg, #fde68a, #f59e0b);
  color:#111;font-weight:900;box-shadow:0 14px 28px rgba(0,0,0,.25), inset 0 0 0 4px #111;animation:float 8s ease-in-out infinite}
.kp-hero__visual .coin--a{left:-14%;top:10%;animation-delay:-.5s}
.kp-hero__visual .coin--b{right:-10%;bottom:8%;width:64px;height:64px;animation-delay:-2s}
.kp-hero__visual .coin--c{left:6%;bottom:-6%;width:52px;height:52px;animation-delay:-3.3s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.kp-hero__glow{position:absolute;inset:auto -20% -30% -20%;height:320px;pointer-events:none;z-index:-1;background:radial-gradient(60% 100% at 50% 0%, rgba(34,211,238,.15), transparent 60%);filter:blur(28px)}

/* ===== Cards (blog index) ===== */
.card{display:grid;grid-template-columns: 1fr;gap:12px;border-radius:16px;overflow:hidden;background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.14);box-shadow:0 10px 26px rgba(2,6,23,.25);margin:0 0 24px}
@media (prefers-color-scheme: light){.card{background:#fff;border-color:#e6eaf5}}
.card__thumb img{width:100%;height:auto;aspect-ratio: 5 / 3;object-fit:cover}
.card__body{padding:14px 16px 16px}
.card__title{font-size:1.2rem;margin:.2rem 0 .1rem}
.card__title a{text-decoration:none}
.card__meta{color:var(--muted);font-size:.92rem}
.card__meta .sep{margin:0 .5em;color:rgba(0,0,0,.35)}
.card__excerpt{color:var(--muted);margin:.5rem 0 0}
.card__more{display:inline-block;margin-top:.6rem;font-weight:700;text-decoration:none;background:linear-gradient(90deg,var(--a),var(--b));-webkit-background-clip:text;background-clip:text;color:transparent}

/* 2-column grid on archives/home */
main > .card{ /* fallback single column */ }
@media (min-width: 720px){
  .content.with-sidebar main{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
  .content.with-sidebar main > .card{margin:0}
}

/* ===== Sidebar ===== */
.sidebar .widget{background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.14);border-radius:16px;padding:14px 16px;margin-bottom:18px}
@media (prefers-color-scheme: light){.sidebar .widget{background:#fff;border-color:#e6eaf5}}
.widget-title{font-weight:800;margin:0 0 .5rem}

/* ===== Single ===== */
.entry-header{margin-bottom:12px}
.entry-title{font-size:clamp(26px,4vw,38px);line-height:1.25;margin:.2em 0}
.entry-meta{color:var(--muted);font-size:.92rem;margin:.35rem 0 .2rem}
.entry-thumb img{width:100%;height:auto;border-radius:14px}
.entry-content{margin-top:16px}
.entry-content h2{font-size:1.35rem;margin:1.8em 0 .6em}
.entry-content h3{font-size:1.18rem;margin:1.4em 0 .4em}
.entry-content p{margin:1em 0}
.entry-content a{text-decoration:underline}
.kb-breadcrumb{font-size:.9rem;color:var(--muted);margin:.4rem 0 1rem}
.kb-breadcrumb ol{display:flex;flex-wrap:wrap;gap:.5em}
.kb-breadcrumb a{text-decoration:none}

/* TOC */
.kb-toc{margin:18px 0 14px;padding:12px 14px;border-radius:12px;background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.14)}
@media (prefers-color-scheme: light){.kb-toc{background:#fff;border-color:#e6eaf5}}
.kb-toc strong{display:block;margin-bottom:8px}
.kb-toc ol{margin:0;padding-left:1.2em}
.kb-toc a{text-decoration:none}

/* Pagination */
.pagination, .nav-links{text-align:center;margin:24px 0}
.page-numbers{display:inline-block;margin:0 6px;padding:.4em .6em;border-radius:8px;border:1px solid rgba(255,255,255,.14)}
@media (prefers-color-scheme: light){.page-numbers{border-color:#e6eaf5}}
.page-numbers.current{background:linear-gradient(90deg,var(--a),var(--b));color:#fff;border-color:transparent}

/* === Patch: posts grid on front page === */
.section-title{font-weight:800;font-size:clamp(20px,2.6vw,24px);margin:0 0 .6rem}
.posts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.posts-grid .card{margin:0}

/* === Page Header (fixed pages) === */
.kb-page-header{position:relative;padding:42px 0 26px;isolation:isolate;overflow:hidden}
.kb-page-header-bg{position:absolute;inset:0;z-index:-1;background:
  radial-gradient(1000px 480px at 8% 10%, rgba(34,211,238,.14), transparent 60%),
  radial-gradient(800px 420px at 90% 30%, rgba(124,58,237,.18), transparent 60%),
  linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0));}
@media (prefers-color-scheme: light){
  .kb-page-header-bg{background:
    radial-gradient(900px 420px at 10% 10%, rgba(34,211,238,.10), transparent 60%),
    radial-gradient(800px 420px at 90% 30%, rgba(124,58,237,.12), transparent 60%),
    linear-gradient(180deg,#f7f9ff,#ffffff);}
}
.kb-page-title{font-weight:900;letter-spacing:.01em;margin:.2em 0 .1em;
  font-size:clamp(28px,4.8vw,44px);line-height:1.12;
  background:linear-gradient(90deg,var(--a),var(--b),var(--c));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 24px rgba(34,211,238,.25);
}
.kb-page-subtitle{font-size:clamp(14px,2vw,18px);color:var(--muted);margin:.2em 0 0}
/* Breadcrumb a bit tighter inside header */
.kb-page-header .kb-breadcrumb{margin:0 0 .4rem}