:root{color-scheme:light dark;--bg:#faf6ee;--surface:#fffdf9;--surface-2:#f4eadb;--ink:#17202e;--muted:#626978;--line:#e5d7c5;--accent:#e8930c;--accent-hover:#c97a0a;--accent-soft:#fff1d2;--deep:#17202e;--deep-2:#222e40;--on-deep:#fffaf1;--shadow-sm:0 8px 24px rgba(52,35,14,.08);--shadow:0 22px 60px rgba(52,35,14,.12);--mesh-1:rgba(251,191,36,.28);--mesh-2:rgba(251,146,60,.17);--glass:rgba(250,246,238,.82)}
    @media(prefers-color-scheme:dark){:root{--bg:#0d1320;--surface:#151d2e;--surface-2:#1c2638;--ink:#f7f3e9;--muted:#b3bbca;--line:#2d394d;--accent:#fbbf24;--accent-hover:#f59e0b;--accent-soft:#352b16;--deep:#f8e9c2;--deep-2:#fff3d4;--on-deep:#111827;--shadow-sm:0 8px 28px rgba(0,0,0,.24);--shadow:0 24px 64px rgba(0,0,0,.34);--mesh-1:rgba(251,191,36,.13);--mesh-2:rgba(251,146,60,.08);--glass:rgba(13,19,32,.82)}}
    html[data-theme="light"]{color-scheme:light;--bg:#faf6ee;--surface:#fffdf9;--surface-2:#f4eadb;--ink:#17202e;--muted:#626978;--line:#e5d7c5;--accent:#e8930c;--accent-hover:#c97a0a;--accent-soft:#fff1d2;--deep:#17202e;--deep-2:#222e40;--on-deep:#fffaf1;--shadow-sm:0 8px 24px rgba(52,35,14,.08);--shadow:0 22px 60px rgba(52,35,14,.12);--mesh-1:rgba(251,191,36,.28);--mesh-2:rgba(251,146,60,.17);--glass:rgba(250,246,238,.82)}
    html[data-theme="dark"]{color-scheme:dark;--bg:#0d1320;--surface:#151d2e;--surface-2:#1c2638;--ink:#f7f3e9;--muted:#b3bbca;--line:#2d394d;--accent:#fbbf24;--accent-hover:#f59e0b;--accent-soft:#352b16;--deep:#f8e9c2;--deep-2:#fff3d4;--on-deep:#111827;--shadow-sm:0 8px 28px rgba(0,0,0,.24);--shadow:0 24px 64px rgba(0,0,0,.34);--mesh-1:rgba(251,191,36,.13);--mesh-2:rgba(251,146,60,.08);--glass:rgba(13,19,32,.82)}
    *{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}.page{width:min(1180px,calc(100% - 40px));margin:0 auto}
    h1,h2,h3,.wordmark{font-family:"Sora",system-ui,sans-serif;letter-spacing:-.035em}.site-header{position:sticky;top:0;z-index:30;border-bottom:1px solid color-mix(in srgb,var(--line) 72%,transparent);background:var(--glass);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.site-header .page{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}.wordmark{font-size:1.04rem;font-weight:700;text-decoration:none;white-space:nowrap}.wordmark span{color:var(--accent)}.header-actions,.site-links{display:flex;align-items:center;gap:18px}.site-links a{color:var(--muted);font-size:.84rem;font-weight:600;text-decoration:none}.site-links a:hover{color:var(--ink)}.theme-toggle{width:42px;height:42px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:50%;display:grid;place-items:center;box-shadow:var(--shadow-sm)}.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}.theme-toggle svg{width:18px;height:18px}.theme-toggle .moon{display:none}html[data-theme="dark"] .theme-toggle .sun{display:none}html[data-theme="dark"] .theme-toggle .moon{display:block}
    .hero{position:relative;overflow:hidden;padding:92px 0 70px;background:radial-gradient(circle at 12% 12%,var(--mesh-1),transparent 31%),radial-gradient(circle at 88% 24%,var(--mesh-2),transparent 33%),radial-gradient(circle at 55% 115%,var(--mesh-1),transparent 34%)}.hero::after{content:"";position:absolute;inset:auto 0 0;height:1px;background:linear-gradient(90deg,transparent,var(--accent),transparent);opacity:.35}.hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:70px;align-items:end}.eyebrow{display:inline-flex;align-items:center;gap:9px;margin:0 0 20px;padding:7px 12px;border:1px solid color-mix(in srgb,var(--accent) 38%,var(--line));background:color-mix(in srgb,var(--surface) 82%,transparent);border-radius:999px;font-size:.76rem;font-weight:700;color:var(--accent-hover)}.eyebrow svg{width:15px;height:15px}.hero h1{font-size:clamp(3.2rem,7.4vw,6.8rem);line-height:.95;margin:0;max-width:850px}.hero h1 span{color:var(--accent)}.hero-copy>p{margin:0 0 24px;color:var(--muted);font-size:1.06rem}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:26px}.button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:10px;font-weight:700;font-size:.88rem;text-decoration:none;transition:background .18s ease,border-color .18s ease,transform .18s ease}.button.primary{background:var(--accent);color:#1e1709;border:1px solid var(--accent)}.button.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:#fff}.button.secondary{background:var(--surface);border:1px solid var(--line)}.button.secondary:hover{border-color:var(--accent)}.stats{display:flex;gap:8px;flex-wrap:wrap}.stat{background:color-mix(in srgb,var(--surface) 84%,transparent);border:1px solid var(--line);border-radius:10px;padding:9px 11px;color:var(--muted);font-size:.74rem}.stat strong{color:var(--ink);font-size:.88rem;margin-right:4px}
    .search-wrap{position:relative;margin:28px 0 0}.search-wrap svg{position:absolute;left:16px;top:50%;width:20px;height:20px;transform:translateY(-50%);color:var(--accent)}.search-wrap input{min-height:58px;padding:15px 18px 15px 48px;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-sm)}.search-wrap input::placeholder{color:var(--muted)}.search-status{display:block;min-height:20px;margin:7px 4px 0;color:var(--muted);font-size:.78rem}
    .ad-slot{display:grid;place-items:center;text-align:center;border:1px dashed color-mix(in srgb,var(--line) 78%,var(--muted));background:color-mix(in srgb,var(--surface) 78%,transparent);color:var(--muted);min-height:108px;padding:16px}.ad-slot span{display:block;font-size:.64rem;letter-spacing:.15em;font-weight:700}.ad-slot strong{display:block;margin-top:4px;font-size:.78rem;font-weight:500}.ad-a{margin:24px auto 0}.ad-b{margin:34px auto 76px}.ad-c{position:sticky;top:92px;min-height:560px;margin:0}.ad-e{margin:0 auto 34px}
    .tools-section{padding:76px 0 36px}.section-head{display:grid;grid-template-columns:1fr .62fr;gap:36px;align-items:end;margin-bottom:28px}.section-kicker{margin:0 0 9px;color:var(--accent-hover);font-size:.74rem;font-weight:700}.section-head h2,.secondary h2,.guide-library h2{font-size:clamp(2.2rem,4.6vw,4.6rem);line-height:1.02;margin:0}.section-head>p{color:var(--muted);margin:0}.tool-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.tool-card{display:flex;flex-direction:column;min-height:210px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:15px;text-decoration:none;box-shadow:0 1px 0 rgba(255,255,255,.2);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.tool-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 16px 38px color-mix(in srgb,var(--accent) 15%,transparent)}.tool-card[hidden]{display:none}.tool-card-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:11px;background:var(--accent-soft);color:var(--accent-hover);margin-bottom:20px}.tool-card-icon svg{width:22px;height:22px}.tool-card-tag{color:var(--accent-hover);font-size:.67rem;font-weight:700;margin-bottom:8px}.tool-card h3{font-size:1rem;line-height:1.18;margin:0 0 8px}.tool-card p{font-size:.8rem;color:var(--muted);margin:0}.tool-card .open-tool{margin-top:auto;padding-top:18px;font-size:.76rem;font-weight:700;color:var(--ink)}.divider{height:28px;width:100%;border:0;margin:44px 0 0;background:linear-gradient(135deg,transparent 0 48%,color-mix(in srgb,var(--accent) 32%,transparent) 49% 51%,transparent 52%) 0 0/44px 28px repeat-x;opacity:.7}
    .workspace{display:grid;grid-template-columns:220px minmax(0,1fr) 180px;gap:24px;padding:58px 0 36px;align-items:start}.tool-nav{position:sticky;top:92px;max-height:calc(100vh - 112px);overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:8px;scrollbar-width:thin;box-shadow:var(--shadow-sm)}.tool-nav strong{display:block;padding:10px 12px 8px;font-size:.68rem;color:var(--muted)}.tool-nav button{width:100%;border:0;background:transparent;color:var(--muted);padding:9px 11px;border-radius:8px;text-align:left;font-weight:600;font-size:.82rem;transition:background .18s ease,color .18s ease}.tool-nav button:hover{background:var(--surface-2);color:var(--ink)}.tool-nav button.active{background:var(--deep);color:var(--on-deep)}.mobile-switch{display:none}.calculator-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;overflow:hidden}.panel{display:none}.panel.active{display:block}.panel-head{padding:34px 36px 20px}.panel-number{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;background:var(--accent-soft);color:var(--accent-hover);font-weight:700;font-size:.8rem;margin-bottom:18px}.panel h2{margin:0 0 8px;font-size:clamp(2rem,4vw,3.1rem);line-height:1.02}.panel-head p{color:var(--muted);margin:0;max-width:650px}.form-area{padding:8px 36px 36px}.formula-line{display:flex;align-items:end;gap:11px;flex-wrap:wrap;padding:20px 0 24px}.field{flex:1 1 138px;min-width:0}.field.small{flex:0 1 120px}label{display:block;color:var(--muted);font-size:.75rem;font-weight:700;margin-bottom:7px}input,select{width:100%;border:1px solid var(--line);color:var(--ink);background:var(--bg);border-radius:10px;padding:13px 14px;outline:none}input:focus,select:focus,button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent);outline-offset:3px}.operator{color:var(--muted);font-size:1.25rem;padding:0 2px 10px}.calculate{border:0;border-radius:10px;background:var(--accent);color:#1e1709;font-weight:700;padding:14px 20px;min-height:50px;transition:background .18s ease,transform .18s ease}.calculate:hover{background:var(--accent-hover);color:#fff}.result-box{background:var(--deep-2);color:var(--on-deep);border-radius:14px;padding:24px 25px;display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}.result-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;font-weight:700;opacity:.72}.result-value{display:block;margin-top:2px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-variant-numeric:tabular-nums;font-size:clamp(1.9rem,4vw,3.15rem);font-weight:700;line-height:1.1;overflow-wrap:anywhere}.result-note{display:block;font-size:.86rem;margin-top:7px;opacity:.8}.copy-result{border:1px solid currentColor;color:inherit;background:transparent;border-radius:8px;padding:9px 12px;font-weight:700}.copy-result:hover{background:color-mix(in srgb,currentColor 10%,transparent)}.error{color:var(--accent-hover);margin:12px 0 0;min-height:24px;font-weight:600;font-size:.86rem}.method{padding:22px 36px 28px;background:var(--surface-2);border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.method strong{color:var(--ink)}
    .secondary,.guide-library,.faq,.trust{padding:76px 0;border-top:1px solid var(--line)}.secondary h2{max-width:760px;margin:0 0 34px}.guide-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:18px}.guide-main,.guide-side{background:var(--surface);border:1px solid var(--line);padding:30px;border-radius:16px}.guide-grid h3{margin:0 0 12px;font-size:1.04rem}.guide-grid p{margin:0 0 18px;color:var(--muted)}.guide-grid p:last-child{margin-bottom:0}.equation,.work{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--ink);background:var(--surface-2);padding:12px 14px;border-radius:8px;font-size:.84rem}.examples{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}.example{background:var(--bg);border:1px solid var(--line);padding:17px;border-radius:10px}.example span{display:block;color:var(--muted);font-size:.75rem}.example strong{display:block;font-family:"Sora",sans-serif;font-size:1.35rem;margin-top:4px}.formula-directory{margin-top:34px;padding-top:30px;border-top:1px solid var(--line)}.formula-directory h3{font-size:1.55rem;margin:0 0 18px}.formula-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px;margin:0}.formula-list div{display:grid;grid-template-columns:minmax(120px,.7fr) 1.3fr;gap:14px;padding:14px 0;border-top:1px solid var(--line)}.formula-list dt{font-weight:700}.formula-list dd{color:var(--muted);margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem;overflow-wrap:anywhere}.guide-library-head{display:grid;grid-template-columns:1fr .75fr;gap:36px;align-items:end;margin-bottom:22px}.guide-library-head p{margin:0;color:var(--muted)}.guide-toc{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 26px}.guide-toc a{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:7px 11px;color:var(--muted);font-size:.75rem;font-weight:600;text-decoration:none}.guide-toc a:hover{border-color:var(--accent);color:var(--ink)}.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.article-card{display:flex;flex-direction:column;min-height:250px;padding:26px;background:var(--surface);border:1px solid var(--line);color:inherit;text-decoration:none;border-radius:15px;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}.article-card:hover{border-color:var(--accent);box-shadow:var(--shadow-sm);transform:translateY(-3px)}.article-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--accent-hover);font-size:.7rem;font-weight:700;margin-bottom:24px}.article-meta .reading{color:var(--muted)}.article-card h3{font-size:1.45rem;line-height:1.12;margin:0 0 10px}.article-card p{color:var(--muted);font-size:.88rem;margin:0 0 24px}.read-guide{margin-top:auto;font-weight:700;font-size:.84rem}.faq h2,.trust h2{font-size:clamp(2rem,4vw,3rem);margin:0 0 24px}details{border-top:1px solid var(--line)}details:last-child{border-bottom:1px solid var(--line)}summary{list-style:none;cursor:pointer;padding:20px 4px;font-weight:700;display:flex;justify-content:space-between;gap:16px}summary::-webkit-details-marker{display:none}summary::after{content:"+";color:var(--accent);font-size:1.3rem}details[open] summary::after{content:"−"}details p{color:var(--muted);max-width:800px;margin:-5px 4px 22px}.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.trust article{padding-top:18px;border-top:2px solid var(--line)}.trust h3{font-size:.96rem;margin:0 0 8px}.trust p{color:var(--muted);font-size:.87rem;margin:0}footer{padding:28px 0 48px;color:var(--muted);font-size:.8rem;border-top:1px solid var(--line)}footer .page{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}footer nav{display:flex;gap:16px;flex-wrap:wrap}footer a{text-underline-offset:3px}
    .reveal{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}.reveal.is-visible{opacity:1;transform:none}
    @media(max-width:1000px){.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.workspace{grid-template-columns:200px minmax(0,1fr)}.ad-c{display:none}}
    @media(max-width:820px){.page{width:min(100% - 28px,700px)}.site-links{display:none}.hero{padding:62px 0 50px}.hero-inner,.section-head,.guide-library-head{grid-template-columns:1fr;gap:22px}.hero-copy{max-width:590px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace{grid-template-columns:1fr;gap:16px;padding-top:40px}.tool-nav{display:none}.mobile-switch{display:block}.mobile-switch label{margin-left:2px}.mobile-switch select{background:var(--surface)}.guide-grid,.trust-grid,.formula-list{grid-template-columns:1fr}.examples{grid-template-columns:1fr}.ad-b{margin-bottom:56px}}
    @media(max-width:560px){.page{width:min(100% - 20px,520px)}.site-header .page{min-height:62px}.header-actions{gap:10px}.hero{padding:46px 0 38px}.hero h1{font-size:clamp(2.8rem,15vw,4.6rem)}.hero-actions .button{flex:1 1 140px}.tool-grid{grid-template-columns:1fr}.tool-card{min-height:0}.calculator-card{border-radius:15px}.panel-head{padding:26px 20px 14px}.form-area{padding:6px 20px 24px}.formula-line{align-items:stretch;gap:10px}.field,.field.small{flex-basis:100%}.operator{display:none}.calculate{width:100%}.result-box{grid-template-columns:1fr;padding:20px}.copy-result{justify-self:start}.method{padding:20px}.secondary,.guide-library,.faq,.trust{padding:54px 0}.guide-main,.guide-side{padding:22px}.article-grid{grid-template-columns:1fr}.article-card{min-height:0;padding:22px}.formula-list div{grid-template-columns:1fr;gap:5px}.ad-slot{min-height:92px}.stats{gap:6px}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none}*,*::before,*::after{transition:none!important}}
.breadcrumbs{font-size:.8rem;color:var(--muted);margin:22px 0 6px}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--accent-hover)}
.breadcrumbs span[aria-current]{color:var(--ink);font-weight:600}
.toolpage-head{padding:26px 0 8px}
.toolpage-head h1{font-size:clamp(2rem,4.5vw,3.2rem);line-height:1.05;margin:.35em 0 .4em}
.toolpage-head .lede{color:var(--muted);font-size:1.05rem;max-width:62ch}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start;padding:26px 0 10px}
.tool-main{min-width:0}
.ad-c-side{position:sticky;top:96px;align-self:start;display:flex;flex-direction:column;gap:18px}
.ad-c-side .ad-slot{margin:0}
.explainer{margin:34px 0 0}
.explainer h2{font-size:1.5rem;margin:1.6em 0 .6em}
.explainer h3{font-size:1.1rem;margin:1.4em 0 .5em}
.explainer p,.explainer li{color:var(--ink)}
.explainer p.muted,.explainer li{color:var(--muted)}
.formula-box{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:14px 16px;font-size:.92rem;overflow-x:auto}
.example-box{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:14px 0}
.use-list{margin:.6em 0;padding-left:1.2em;color:var(--muted)}
.use-list li{margin:.35em 0}
.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:10px 0}
.faq-list summary{font-weight:700;cursor:pointer}
.faq-list details p{color:var(--muted);margin:.6em 0 0}
.related{margin:44px 0 10px}
.related h2{font-size:1.4rem;margin:0 0 16px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.related-grid a{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;display:block;transition:border-color .18s ease,transform .18s ease}
.related-grid a:hover{border-color:var(--accent);transform:translateY(-3px)}
.related-grid strong{display:block;margin-bottom:4px}
.related-grid span{color:var(--muted);font-size:.82rem}
.hub-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:26px 0}
.guide-article{max-width:72ch}
.guide-article h2{font-size:1.6rem;margin:1.8em 0 .6em}
.guide-article h3{font-size:1.15rem;margin:1.5em 0 .5em}
.guide-article p,.guide-article li{line-height:1.7}
.guide-article .formula,.guide-article .work{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-2);border:1px solid var(--line);padding:12px 14px;border-radius:8px;font-size:.88rem;overflow-x:auto}
.guide-article .note{background:var(--accent-soft);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:16px 0}
.guide-article .steps{padding-left:1.3em}
.guide-article .steps li{margin:.5em 0}
.guide-article table{border-collapse:collapse;width:100%;margin:16px 0;font-size:.9rem}
.guide-article th,.guide-article td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.guide-article details{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:10px 0}
.guide-article summary{font-weight:700;cursor:pointer}
.cat-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:30px 0}
.cat-card{background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:24px;text-decoration:none;display:block;transition:transform .2s ease,border-color .2s ease}
.cat-card:hover{transform:translateY(-4px);border-color:var(--accent)}
.cat-card h3{margin:0 0 8px;font-size:1.1rem}
.cat-card p{margin:0;color:var(--muted);font-size:.88rem}
.notfound{text-align:center;padding:90px 0}
.notfound h1{font-size:clamp(2.4rem,6vw,4rem);margin:0 0 12px}
@media(max-width:1000px){.tool-layout{grid-template-columns:1fr}.tool-layout .ad-c-side{display:none}.related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.cat-cards{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.related-grid{grid-template-columns:1fr}.hub-grid{grid-template-columns:1fr}.cat-cards{grid-template-columns:1fr}}