:root{
  --zk-yellow:#FFC400; --zk-amber:#F5A700; --zk-navy:#0E1A2B;
  --zk-ink:#14213a; --zk-muted:#5b6678; --zk-line:#e6e9f0; --zk-soft:#f6f7fb; --zk-white:#fff;
  --zk-radius:14px;
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;color:var(--zk-ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,h5,.zk-logo-name{font-family:'Poppins','Inter',sans-serif;color:var(--zk-navy);letter-spacing:-.01em}
a{color:#b57a00;text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--zk-navy)}
:focus-visible{outline:3px solid var(--zk-amber);outline-offset:2px;border-radius:4px}
.zk-skip{position:absolute;left:8px;top:8px;z-index:100;background:#fff;padding:8px 12px;border-radius:8px}

/* buttons */
.btn-zk{background:linear-gradient(135deg,var(--zk-yellow),var(--zk-amber));color:var(--zk-navy);font-weight:600;border:0;border-radius:10px}
.btn-zk:hover,.btn-zk:focus{color:var(--zk-navy);filter:brightness(.96);box-shadow:0 4px 14px rgba(245,167,0,.35)}
.btn-zk:disabled{opacity:.6}

/* header + logo */
.zk-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--zk-line)}
.zk-logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;padding:6px 0}
.zk-logo-mark{width:40px;height:44px;flex:none}
.zk-logo-text{display:flex;flex-direction:column;line-height:1}
.zk-logo-name{font-weight:700;font-size:1.6rem;color:var(--zk-navy)}
.zk-logo-tag{font-size:.68rem;color:var(--zk-muted);letter-spacing:.06em;margin-top:3px}
.zk-logo-img{max-height:46px;width:auto}
.zk-logo-light .zk-logo-name{color:#fff}.zk-logo-light .zk-logo-tag{color:rgba(255,255,255,.65)}
.navbar-nav .nav-link{color:var(--zk-ink);font-weight:500;padding:.6rem .9rem}
.navbar-nav .nav-link:hover{color:#b57a00}

/* hero */
.zk-hero{background:var(--zk-navy);color:#fff;padding:72px 0 64px;position:relative;overflow:hidden}
.zk-hero h1{color:#fff;font-weight:700;font-size:clamp(2rem,5vw,3.4rem);line-height:1.12;max-width:16ch;margin-bottom:16px}
.zk-hero .lead{color:rgba(255,255,255,.78);max-width:52ch}
.zk-hero-z{position:absolute;right:-30px;top:50%;transform:translateY(-50%) rotate(-4deg);width:min(46vw,460px);color:rgba(255,196,0,.14)}
.zk-search{position:relative;max-width:560px;margin-top:28px}
.zk-search .bi{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--zk-muted);z-index:2}
.zk-search input{padding-left:46px;border:0;border-radius:12px;height:54px}
.zk-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.zk-chips a{display:inline-flex;align-items:center;gap:6px;color:#fff;border:1px solid rgba(255,255,255,.28);border-radius:99px;padding:6px 14px;font-size:.88rem;text-decoration:none}
.zk-chips a:hover{background:var(--zk-yellow);color:var(--zk-navy);border-color:var(--zk-yellow)}
.zk-chips-dark a{color:var(--zk-ink);border-color:var(--zk-line);background:#fff}
.zk-chips-dark a.on{background:var(--zk-navy);color:#fff;border-color:var(--zk-navy)}

/* headings */
.zk-h1{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:700;margin-bottom:.6rem}
.zk-h2{font-size:1.5rem;font-weight:700}

/* tool grid */
.zk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.zk-tool{display:flex;gap:14px;align-items:flex-start;padding:16px;border:1px solid var(--zk-line);border-radius:var(--zk-radius);text-decoration:none;color:inherit;background:#fff;transition:border-color .15s,box-shadow .15s}
.zk-tool:hover{border-color:var(--zk-amber);box-shadow:0 8px 24px rgba(14,26,43,.08);color:inherit}
.zk-tool-icon{display:inline-grid;place-items:center;width:46px;height:46px;border-radius:12px;background:#fff6d6;color:#9a6a00;font-size:1.35rem;flex:none}
.zk-tool-icon.sm{width:34px;height:34px;font-size:1rem;border-radius:9px}
.zk-tool-body{display:flex;flex-direction:column;min-width:0}
.zk-tool-name{font-weight:600;color:var(--zk-navy)}
.zk-tool-desc{font-size:.86rem;color:var(--zk-muted);margin-top:2px}
.zk-badge{background:var(--zk-navy);color:var(--zk-yellow);font-size:.62rem;vertical-align:middle}

/* tool page */
.zk-toolbox{background:#fff;border:1px solid var(--zk-line);border-top:4px solid var(--zk-yellow);border-radius:var(--zk-radius);padding:24px;box-shadow:0 10px 30px rgba(14,26,43,.05)}
.zk-prose{max-width:75ch}
.zk-prose h2{font-size:1.3rem;margin:1.8rem 0 .7rem}
.zk-prose h3{font-size:1.1rem;margin-top:1.4rem}
.zk-prose li{margin-bottom:.3rem}
.zk-narrow{max-width:820px;margin:0 auto}
.zk-faq .accordion-button{font-weight:600;color:var(--zk-navy);font-size:1rem}
.zk-faq .accordion-button:not(.collapsed){background:#fff6d6;color:var(--zk-navy)}
.zk-side{border:1px solid var(--zk-line);border-radius:var(--zk-radius);padding:18px;background:var(--zk-soft)}
.zk-side-tool{display:flex;gap:10px;align-items:center;padding:8px 0;color:var(--zk-ink);text-decoration:none;font-weight:500}
.zk-side-tool:hover{color:#b57a00}
.zk-result{border:1px solid var(--zk-line);border-radius:12px;padding:16px;background:var(--zk-soft)}
.zk-result-text{white-space:pre-wrap;word-break:break-word}
.zk-about{background:var(--zk-soft);border-radius:var(--zk-radius);padding:32px}

/* prompts */
.zk-post{display:block;border:1px solid var(--zk-line);border-radius:var(--zk-radius);overflow:hidden;text-decoration:none;color:inherit;height:100%;background:#fff}
.zk-post:hover{border-color:var(--zk-amber);color:inherit}
.zk-post img{width:100%;aspect-ratio:16/9;object-fit:cover}
.zk-post-ph{aspect-ratio:16/9;display:grid;place-items:center;background:#fff6d6;color:#9a6a00;font-size:2.2rem}
.zk-prompt{background:var(--zk-navy);color:#fff;border-radius:12px;padding:18px;margin-bottom:1rem}
.zk-prompt strong{color:var(--zk-yellow)}
#prompt-text{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92rem;color:#e9eefb}

/* ads */
.zk-ad{text-align:center;min-height:50px;overflow:hidden}
.zk-ad-label{display:block;font-size:.65rem;color:#98a2b3;margin-bottom:2px;text-transform:none}
.zk-sticky{position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--zk-line);padding:2px 0}

/* footer */
.zk-footer{background:var(--zk-navy);color:#fff;padding:48px 0 20px;margin-top:48px}
.zk-footer h6{color:var(--zk-yellow);font-family:'Poppins',sans-serif;font-size:.95rem;margin-bottom:12px}
.zk-footer a{color:rgba(255,255,255,.8);text-decoration:none}
.zk-footer a:hover{color:var(--zk-yellow)}
.zk-footer li{margin-bottom:6px}
.zk-social{display:flex;gap:12px;font-size:1.2rem}
.zk-copy{border-top:1px solid rgba(255,255,255,.14);margin-top:28px;padding-top:16px;font-size:.8rem;color:rgba(255,255,255,.6)}
.zk-cookie{position:fixed;left:16px;right:16px;bottom:16px;max-width:560px;background:var(--zk-navy);color:#fff;padding:16px 18px;border-radius:14px;z-index:70;box-shadow:0 12px 40px rgba(0,0,0,.3);font-size:.9rem}
.zk-cookie a{color:var(--zk-yellow)}

/* shared tool UI */
.zk-canvas-wrap{background:repeating-conic-gradient(#f1f3f8 0% 25%,#fff 0% 50%) 0 0/20px 20px;border:1px solid var(--zk-line);border-radius:12px;padding:10px;text-align:center;overflow:auto}
.zk-canvas-wrap canvas,.zk-canvas-wrap img{max-width:100%;height:auto;border-radius:6px}
.zk-stat{background:var(--zk-soft);border:1px solid var(--zk-line);border-radius:12px;padding:14px;text-align:center}
.zk-stat b{display:block;font-family:'Poppins',sans-serif;font-size:1.5rem;color:var(--zk-navy)}
.zk-stat span{font-size:.8rem;color:var(--zk-muted)}
.zk-out{font-family:ui-monospace,Menlo,Consolas,monospace;word-break:break-all}
.zk-calc button{min-height:52px;font-weight:600}
.zk-fancy-row{display:flex;gap:10px;align-items:center;border:1px solid var(--zk-line);border-radius:10px;padding:8px 12px;margin-bottom:8px}
.zk-fancy-row .txt{flex:1;word-break:break-all;font-size:1.1rem}
.zk-tap{width:200px;height:200px;border-radius:50%;font-size:1.4rem;font-weight:700}

@media (max-width:575px){.zk-toolbox{padding:16px}.zk-hero{padding:48px 0 44px}.zk-logo-name{font-size:1.35rem}body{padding-bottom:0}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}