:root{--bg:#0b0f17;--bg-2:#0f1521;--bg-3:#131b2a;--surface:#111a2b;--surface-2:#16213a;--border:#22304a;--text:#e6ecf7;--text-2:#9fb0c8;--text-3:#64748e;--accent:#22d3ee;--accent-2:#8b5cf6;--ok:#4ade80;--warn:#fbbf24;--danger:#f87171;--radius:12px;--radius-sm:8px;--shadow:0 10px 28px rgba(0,0,0,0.45);--header-h:60px;--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,"Cascadia Mono",Consolas,monospace}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}img,svg{max-width:100%;height:auto}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}h1,h2,h3{line-height:1.2;color:#f4f8ff;margin:0 0 0.5em}h1{font-size:clamp(1.7rem,4vw,2.6rem);letter-spacing:-0.02em}h2{font-size:clamp(1.25rem,2.6vw,1.6rem)}p{margin:0 0 1em}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.container{width:100%;max-width:1120px;margin-inline:auto;padding-inline:clamp(14px,4vw,28px)}.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}.skip-link{position:absolute;inset-inline-start:12px;inset-block-start:8px;z-index:100;transform:translateY(-200%);background:var(--accent);color:#04222a;padding:8px 14px;border-radius:var(--radius-sm);font-weight:600}.skip-link:focus{transform:none}.site-header{position:sticky;top:0;z-index:50;background:rgba(11,15,23,0.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;gap:14px;min-height:var(--header-h)}.logo{display:inline-flex;align-items:center;gap:8px;color:var(--text);font-weight:800;font-size:1.1rem;letter-spacing:-0.01em}.logo:hover{text-decoration:none;color:var(--accent)}.logo-mark{width:28px;height:28px;color:var(--accent)}.site-nav{display:none;position:absolute;inset-inline:0;top:var(--header-h);background:var(--bg-2);border-bottom:1px solid var(--border);padding:8px 14px 14px;flex-direction:column;gap:2px}.site-nav.is-open{display:flex}.site-nav a{color:var(--text-2);padding:10px 8px;border-radius:var(--radius-sm);font-weight:500}.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--text);background:var(--surface);text-decoration:none}.site-nav .nav-cta{margin-top:8px;text-align:center;background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#04121a;font-weight:700}.nav-toggle{display:inline-flex;align-items:center;justify-content:center;margin-inline-start:auto;width:42px;height:40px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:var(--radius-sm);cursor:pointer}@media (min-width:820px){.nav-toggle{display:none}.site-nav{position:static;display:flex;flex-direction:row;align-items:center;gap:4px;background:none;border:0;padding:0;margin-inline-start:auto}.site-nav a{padding:8px 12px}.site-nav .nav-cta{margin-top:0;margin-inline-start:8px;padding:9px 16px}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:var(--radius-sm);border:1px solid transparent;font-weight:600;font-size:0.95rem;cursor:pointer;transition:transform 0.08s ease,filter 0.12s ease;text-decoration:none}.btn:active{transform:translateY(1px)}.btn-primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#05131a}.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--border)}.btn-ghost:hover{border-color:var(--accent);text-decoration:none}.btn-sm{padding:7px 12px;font-size:0.85rem}button:disabled{opacity:0.5;cursor:not-allowed}.hero{padding:clamp(34px,7vw,72px) 0 clamp(22px,4vw,40px);background:radial-gradient(700px 320px at 12% 0%,rgba(139,92,246,0.16),transparent 60%),radial-gradient(700px 320px at 88% 12%,rgba(34,211,238,0.12),transparent 60%),var(--bg)}.hero-sub{color:var(--text-2);font-size:clamp(1rem,2.2vw,1.15rem);max-width:640px}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.home-search{padding:10px 0 8px}.search-wrap{position:relative;display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:4px 14px}.search-wrap:focus-within{border-color:var(--accent)}.search-wrap svg{color:var(--text-3);flex:none}#tool-search{flex:1;background:none;border:0;color:var(--text);font-size:1rem;padding:12px 0;outline:none}.search-count{color:var(--text-3);font-size:0.85rem;white-space:nowrap}.tool-grid{display:grid;grid-template-columns:1fr;gap:12px}@media (min-width:540px){.tool-grid{grid-template-columns:repeat(2,1fr)}}@media (min-width:900px){.tool-grid{grid-template-columns:repeat(3,1fr)}}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);transition:transform 0.12s ease,border-color 0.12s ease,box-shadow 0.12s ease;animation:card-in 0.35s ease both;animation-delay:calc(var(--i,0) * 22ms)}.tool-card:hover,.tool-card:focus-within{transform:translateY(-2px);border-color:var(--accent);box-shadow:var(--shadow)}.card__link{display:flex;gap:12px;align-items:flex-start;padding:14px;color:inherit;height:100%}.card__link:hover{text-decoration:none}.card__icon{flex:none;width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;font-weight:800;color:var(--accent);background:linear-gradient(135deg,rgba(34,211,238,0.16),rgba(139,92,246,0.16));border:1px solid var(--border);border-radius:10px;font-size:1.05rem}.card__body{display:flex;flex-direction:column;gap:2px;min-width:0}.card__body strong{color:var(--text);display:flex;align-items:center;gap:8px;flex-wrap:wrap}.card__desc{color:var(--text-2);font-size:0.87rem;line-height:1.45}.card__badge{font-size:0.65rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:#05222a;background:linear-gradient(90deg,var(--accent),var(--accent-2));padding:2px 8px;border-radius:99px}@keyframes card-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.home-section{padding-block:8px;scroll-margin-top:calc(var(--header-h) + 10px)}.home-section h2{display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--border);padding-bottom:10px;margin:26px 0 16px}.home-section h2::before{content:"";width:4px;height:22px;border-radius:2px;background:linear-gradient(var(--accent),var(--accent-2))}.home-seo{margin-top:30px}.home-seo h2::before{content:none}.home-seo p{color:var(--text-2)}.tool-layout{padding-block:22px 60px}.breadcrumbs{font-size:0.82rem;color:var(--text-3);margin-bottom:18px}.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}.breadcrumbs li:not(:last-child)::after{content:"/";margin-inline-start:6px;opacity:0.5}.tool-intro{margin-bottom:6px}.tool-intro .lead{color:var(--text-2);font-size:1.05rem;max-width:720px}.content-section{padding-block:18px;border-top:1px solid var(--border);margin-top:10px}.content-section h2{font-size:1.3rem}.content-section p{color:var(--text-2)}.content-section strong{color:var(--text)}.content-section code,.formula-code{background:var(--bg-3);border:1px solid var(--border);padding:2px 7px;border-radius:6px;font-family:var(--mono);font-size:0.9em;color:var(--ok)}.tool-sidebar{display:flex;flex-direction:column;gap:18px;margin-top:26px}.sidebar-links{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.sidebar-links h2{font-size:1rem;margin-bottom:10px}.sidebar-links ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px}.sidebar-links a{color:var(--text-2)}.sidebar-links a:hover{color:var(--accent)}@media (min-width:820px){.tool-layout__grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}.tool-sidebar{position:sticky;top:calc(var(--header-h) + 16px);margin-top:0}}.faq-section{padding-block:20px 6px;border-top:1px solid var(--border);margin-top:14px}.faq-list{display:flex;flex-direction:column;gap:10px}.faq{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}.faq summary{cursor:pointer;padding:13px 16px;font-weight:600;color:var(--text);list-style:none;display:flex;justify-content:space-between;gap:12px}.faq summary::after{content:"+";color:var(--accent);font-size:1.2rem}.faq[open] summary::after{content:"–"}.faq summary::-webkit-details-marker{display:none}.faq p{margin:0;padding:0 16px 15px;color:var(--text-2);font-size:0.95rem}.site-footer{border-top:1px solid var(--border);background:var(--bg-2);margin-top:40px;padding-block:38px 26px}.footer-grid{display:grid;gap:24px;grid-template-columns:1fr}.footer-col--brand p{color:var(--text-2);font-size:0.92rem;max-width:300px}.footer-h{font-size:0.9rem;text-transform:uppercase;letter-spacing:0.08em;color:var(--text-3);margin-bottom:12px}.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}.footer-col a{color:var(--text-2)}.footer-col a:hover{color:var(--accent)}.footer-bottom{margin-top:30px;padding-top:18px;border-top:1px solid var(--border);color:var(--text-3);font-size:0.82rem}@media (min-width:760px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}}.notfound{text-align:center;padding-block:70px}.notfound .tool-grid{max-width:560px;margin:22px auto}@media (prefers-reduced-motion:reduce){*{animation-duration:0.001s !important;animation-iteration-count:1 !important;transition-duration:0.001s !important}html{scroll-behavior:auto}}