/* ===== Design tokens ===== */
:root{
  --bg:#f7f8fc;--bg2:#ffffff;--card:#ffffff;--ink:#0f172a;--ink2:#334155;--muted:#64748b;--line:#e5e7f0;
  --pri:#5b5bf7;--pri2:#8b5cf6;--acc:#06b6d4;--ok:#16a34a;--warn:#f59e0b;--bad:#e11d48;
  --r:16px;--r2:24px;--sh:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);--sh2:0 2px 4px rgba(15,23,42,.05),0 20px 48px rgba(91,91,247,.16);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);color-scheme:light
}
[data-theme=dark]{--bg:#0b1020;--bg2:#0f1629;--card:#131b31;--ink:#e8ecf8;--ink2:#c3cbe0;--muted:#8e9ab8;--line:#232d48;--sh:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);--sh2:0 20px 48px rgba(91,91,247,.25);color-scheme:dark}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 var(--font);color:var(--ink);background:var(--bg);overflow-x:hidden}
img,svg,canvas{max-width:100%;display:block}
a{color:var(--pri);text-decoration-thickness:1px;text-underline-offset:3px}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.5vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.35rem,2.4vw,1.75rem);font-weight:750}
h3{font-size:1.08rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.narrow{max-width:880px}
.center{text-align:center}
.skip{position:absolute;left:-999px;top:8px;background:var(--pri);color:#fff;padding:8px 14px;border-radius:8px;z-index:99}
.skip:focus{left:8px}
:focus-visible{outline:3px solid color-mix(in srgb,var(--pri) 55%,transparent);outline-offset:2px;border-radius:6px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg2) 82%,transparent);backdrop-filter:saturate(1.6) blur(14px);-webkit-backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
.site-header.scrolled{box-shadow:var(--sh)}
.hdr{display:flex;align-items:center;gap:20px;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none}
.logo img{transition:transform .5s var(--ease)}
.logo:hover img{transform:rotate(-12deg) scale(1.08)}
.main-nav{display:flex;gap:4px;align-items:center}
.main-nav>a,.dd-btn{color:var(--ink2);text-decoration:none;padding:8px 12px;border-radius:10px;font:600 .95rem var(--font);background:none;border:0;cursor:pointer}
.main-nav>a:hover,.dd-btn:hover{background:color-mix(in srgb,var(--pri) 10%,transparent);color:var(--pri)}
.dd{position:relative}
.dd-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:270px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh2);padding:8px;display:grid;opacity:0;visibility:hidden;transform:translateY(-6px);transition:.2s var(--ease)}
.dd:hover .dd-menu,.dd.open .dd-menu{opacity:1;visibility:visible;transform:none}
.dd-menu a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;color:var(--ink);text-decoration:none;font-weight:600}
.dd-menu a:hover{background:var(--bg)}
.dd-menu small{margin-left:auto;color:var(--muted);font-weight:500}
.hdr-actions{margin-left:auto;display:flex;gap:8px;align-items:center}
.search{position:relative}
.search input{width:240px;height:40px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--ink);padding:0 14px;font:inherit;transition:width .3s var(--ease),border-color .2s}
.search input:focus{width:300px;border-color:var(--pri);outline:0}
.search-results{position:absolute;right:0;top:calc(100% + 8px);width:340px;max-height:420px;overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh2);display:none;padding:6px}
.search-results.show{display:block;animation:pop .18s var(--ease)}
.search-results a{display:flex;gap:10px;align-items:center;padding:9px 10px;border-radius:10px;color:var(--ink);text-decoration:none}
.search-results a:hover,.search-results a.sel{background:var(--bg)}
.search-results small{color:var(--muted);margin-left:auto;font-size:.78rem}
.search-results .none{padding:12px;color:var(--muted)}
.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:var(--bg);cursor:pointer;font-size:1.05rem;display:grid;place-items:center;color:var(--ink)}
.icon-btn:hover{border-color:var(--pri)}
.moon{display:none}[data-theme=dark] .sun{display:none}[data-theme=dark] .moon{display:inline}
.menu-btn{display:none}
.cur-sel{width:52px;padding:0 6px;font:700 1rem var(--font);text-align:center;appearance:none;-webkit-appearance:none}
@media (max-width:960px){
  .search input{width:160px}.search input:focus{width:200px}
  .menu-btn{display:grid}
  .main-nav{position:fixed;inset:66px 0 auto 0;background:var(--bg2);flex-direction:column;align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:var(--sh2);opacity:0;visibility:hidden;transform:translateY(-10px);transition:opacity .25s var(--ease),transform .3s var(--ease),visibility .3s;max-height:calc(100vh - 66px);overflow:auto}
  .main-nav.open{opacity:1;visibility:visible;transform:none}
  .dd-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 0 8px;min-width:0;display:none}
  .dd.open .dd-menu{display:grid}
}
@media (max-width:560px){.search{display:none}.hdr{gap:10px}}

/* ===== Animated hero ===== */
.hero,.tool-hero{position:relative;overflow:hidden;isolation:isolate}
.hero{padding:84px 0 72px;text-align:center}
.tool-hero{padding:28px 0 36px;--c:var(--pri)}
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;z-index:-1;animation:float 16s ease-in-out infinite alternate}
.b1{width:420px;height:420px;background:var(--c,var(--pri));top:-160px;left:-120px;opacity:.28}
.b2{width:360px;height:360px;background:var(--acc);top:-120px;right:-100px;opacity:.22;animation-delay:-5s}
.b3{width:300px;height:300px;background:var(--pri2);bottom:-160px;left:40%;opacity:.22;animation-delay:-9s}
@keyframes float{0%{transform:translate(0,0) scale(1)}50%{transform:translate(40px,30px) scale(1.08)}100%{transform:translate(-30px,50px) scale(.95)}}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;background-image:radial-gradient(color-mix(in srgb,var(--ink) 9%,transparent) 1px,transparent 1px);background-size:22px 22px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%)}
.hero-in{max-width:880px}
.hero h1{margin:18px 0 16px}
.grad{background:linear-gradient(90deg,var(--pri),var(--pri2),var(--acc),var(--pri));background-size:300% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 8s linear infinite}
@keyframes shine{to{background-position:300% 0}}
.lead{font-size:1.13rem;color:var(--ink2);max-width:760px}
.hero .lead{margin:0 auto 28px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;background:color-mix(in srgb,var(--c,var(--pri)) 12%,var(--bg2));color:var(--c,var(--pri));font-weight:700;font-size:.86rem;border:1px solid color-mix(in srgb,var(--c,var(--pri)) 25%,transparent)}
.pulse{animation:pulse 2.6s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--pri) 35%,transparent)}50%{box-shadow:0 0 0 10px transparent}}
.hero-search{display:flex;gap:10px;max-width:620px;margin:0 auto;flex-wrap:wrap}
.tool-hero .hero-search{margin:18px 0 0}
.hero-search input{flex:1;min-width:220px;height:54px;border-radius:16px;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:0 20px;font:inherit;font-size:1.05rem;box-shadow:var(--sh);transition:.2s}
.hero-search input:focus{outline:0;border-color:var(--pri);box-shadow:0 0 0 4px color-mix(in srgb,var(--pri) 18%,transparent)}
.stats{list-style:none;padding:0;margin:40px auto 0;display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.stats li{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 22px;min-width:140px;box-shadow:var(--sh)}
.stats strong{display:block;font-size:1.6rem;font-weight:800;color:var(--pri)}
.stats span{color:var(--muted);font-size:.88rem}
.tool-hero h1{margin:14px 0 10px;font-size:clamp(1.8rem,4vw,2.6rem)}
.meta-line{display:flex;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:.9rem;margin:0}

/* ===== Breadcrumbs ===== */
.crumbs ol{list-style:none;padding:0;margin:0 0 14px;display:flex;flex-wrap:wrap;gap:6px;font-size:.88rem;color:var(--muted)}
.crumbs li+li::before{content:"›";margin-right:6px;opacity:.6}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--pri)}

/* ===== Cards & grids ===== */
.sec-head{display:flex;justify-content:space-between;align-items:baseline;margin:56px 0 18px}
.sec-head a{font-weight:700;text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px}
.tool-card{--c:var(--pri);position:relative;display:flex;gap:14px;align-items:flex-start;padding:18px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);color:var(--ink);text-decoration:none;box-shadow:var(--sh);transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .3s;overflow:hidden}
.tool-card::after{content:"";position:absolute;inset:0;background:radial-gradient(400px circle at var(--mx,50%) var(--my,50%),color-mix(in srgb,var(--c) 12%,transparent),transparent 45%);opacity:0;transition:opacity .3s;pointer-events:none}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:color-mix(in srgb,var(--c) 45%,var(--line))}
.tool-card:hover::after{opacity:1}
.tc-ic{flex:none;width:48px;height:48px;border-radius:14px;display:grid;place-items:center;font-size:1.5rem;background:color-mix(in srgb,var(--c) 13%,var(--bg2));transition:transform .4s var(--ease)}
.tool-card:hover .tc-ic{transform:scale(1.1) rotate(-6deg)}
.tc-body{display:flex;flex-direction:column;gap:2px;min-width:0}
.tc-cat{font-size:.74rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--c)}
.tc-body strong{font-size:1.02rem}
.tc-desc{color:var(--muted);font-size:.9rem;line-height:1.45}
.tc-go{margin-left:auto;align-self:center;color:var(--c);font-weight:800;transform:translateX(-6px);opacity:0;transition:.3s var(--ease)}
.tool-card:hover .tc-go{transform:none;opacity:1}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.cat-card{--c:var(--pri);display:flex;flex-direction:column;gap:4px;padding:22px;border-radius:var(--r2);background:linear-gradient(160deg,color-mix(in srgb,var(--c) 14%,var(--card)),var(--card) 60%);border:1px solid var(--line);color:var(--ink);text-decoration:none;transition:transform .35s var(--ease),box-shadow .35s}
.cat-card:hover{transform:translateY(-5px) rotate(-.4deg);box-shadow:var(--sh2)}
.cc-ic{font-size:2rem;margin-bottom:6px;transition:transform .5s var(--ease)}
.cat-card:hover .cc-ic{transform:scale(1.15) rotate(8deg)}
.cat-card span{color:var(--c);font-weight:700;font-size:.9rem}
.cat-card em{font-style:normal;color:var(--muted);font-size:.85rem;margin-top:6px}
.why{margin-top:64px}.why h2{text-align:center;margin-bottom:24px}
.why-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.why-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.why-card span{font-size:1.8rem}.why-card h3{margin:10px 0 6px}.why-card p{color:var(--muted);margin:0}
.cat-pills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:48px}
.cat-pill{--c:var(--pri);display:inline-flex;gap:8px;align-items:center;padding:10px 16px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--ink);text-decoration:none;font-weight:600;transition:.25s var(--ease)}
.cat-pill:hover{border-color:var(--c);color:var(--c);transform:translateY(-2px)}
h2.sub{margin-top:48px}
.cat-guide{margin-top:48px;background:var(--card);border:1px solid var(--line);border-radius:var(--r2);padding:28px}
.guide-list{margin:0;padding-left:20px;columns:2;column-gap:40px}.guide-list li{margin-bottom:8px;break-inside:avoid}
@media(max-width:700px){.guide-list{columns:1}}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 12px}
.filter{border:1px solid var(--line);background:var(--card);color:var(--ink2);padding:8px 14px;border-radius:999px;font:600 .9rem var(--font);cursor:pointer;transition:.2s}
.filter small{color:var(--muted)}
.filter:hover{border-color:var(--pri)}
.filter.active{background:var(--pri);border-color:var(--pri);color:#fff}.filter.active small{color:#dfe0ff}
.count{color:var(--muted);font-size:.9rem}
.tool-card.hide{display:none}

/* ===== Tool box ===== */
.tool-box{position:relative;margin-top:-6px;background:var(--card);border:1px solid var(--line);border-radius:var(--r2);padding:clamp(18px,3vw,30px);box-shadow:var(--sh2);animation:rise .6s var(--ease) both}
.tool-box::before{content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;background:linear-gradient(135deg,var(--pri),transparent 35%,transparent 65%,var(--acc));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.5;pointer-events:none}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin-bottom:14px}
.field{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.92rem;color:var(--ink2)}
.field small{font-weight:500;color:var(--muted)}
input[type=text],input[type=number],input[type=date],input[type=time],input[type=url],input[type=email],input[type=password],input:not([type]),select,textarea{width:100%;font:inherit;font-size:1rem;color:var(--ink);background:var(--bg);border:1.5px solid var(--line);border-radius:12px;padding:11px 13px;transition:border-color .2s,box-shadow .2s,background .2s}
textarea{min-height:170px;resize:vertical;line-height:1.55}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--pri);background:var(--card);box-shadow:0 0 0 4px color-mix(in srgb,var(--pri) 15%,transparent)}
input.err{border-color:var(--bad);animation:shake .35s}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 4px}
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:12px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:700 .95rem var(--font);cursor:pointer;text-decoration:none;transition:transform .15s,box-shadow .25s,background .2s,border-color .2s}
.btn:hover{border-color:var(--pri);transform:translateY(-1px)}
.btn:active{transform:translateY(1px) scale(.98)}
.btn-primary{background:linear-gradient(135deg,var(--pri),var(--pri2));border-color:transparent;color:#fff;box-shadow:0 8px 20px color-mix(in srgb,var(--pri) 35%,transparent)}
.btn-primary:hover{box-shadow:0 12px 28px color-mix(in srgb,var(--pri) 45%,transparent);border-color:transparent}
.btn-sm{padding:7px 12px;font-size:.85rem;border-radius:10px}
.ripple{position:absolute;border-radius:50%;transform:scale(0);background:rgba(255,255,255,.45);animation:ripple .6s linear;pointer-events:none}
@keyframes ripple{to{transform:scale(4);opacity:0}}
.seg{display:inline-flex;flex-wrap:wrap;gap:4px;padding:4px;background:var(--bg);border:1px solid var(--line);border-radius:14px;margin-bottom:16px}
.seg button{border:0;background:none;padding:8px 14px;border-radius:10px;font:600 .9rem var(--font);color:var(--ink2);cursor:pointer;transition:.2s}
.seg button.on{background:var(--card);color:var(--pri);box-shadow:var(--sh)}
.result{margin-top:18px;border-radius:var(--r);padding:20px;background:linear-gradient(135deg,color-mix(in srgb,var(--pri) 9%,var(--card)),color-mix(in srgb,var(--acc) 7%,var(--card)));border:1px solid color-mix(in srgb,var(--pri) 22%,var(--line))}
.result:empty{display:none}
.result.show{animation:pop .4s var(--ease)}
@keyframes pop{from{opacity:0;transform:scale(.97) translateY(6px)}to{opacity:1;transform:none}}
.big{font-size:clamp(1.9rem,5vw,2.7rem);font-weight:800;line-height:1.1;color:var(--pri);letter-spacing:-.02em;word-break:break-word}
.big small{font-size:.45em;color:var(--muted);font-weight:600}
.res-label{color:var(--muted);font-weight:600;font-size:.88rem;margin-bottom:4px}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-top:14px}
.kv div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
.kv span{display:block;color:var(--muted);font-size:.8rem;font-weight:600}
.kv strong{font-size:1.12rem}
.note{font-size:.88rem;color:var(--muted);margin:10px 0 0}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-weight:700;font-size:.85rem;background:color-mix(in srgb,var(--bc,var(--pri)) 15%,transparent);color:var(--bc,var(--pri))}
.meter{position:relative;height:12px;border-radius:99px;background:linear-gradient(90deg,#38bdf8,#22c55e 30%,#22c55e 50%,#f59e0b 70%,#ef4444);margin:16px 0 6px}
.meter i{position:absolute;top:50%;width:20px;height:20px;border-radius:50%;background:var(--card);border:4px solid var(--ink);transform:translate(-50%,-50%);transition:left .8s var(--ease)}
.bar{height:10px;border-radius:99px;background:var(--line);overflow:hidden;margin:6px 0}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--pri),var(--acc));width:0;transition:width .9s var(--ease)}
.out{font-family:var(--mono);font-size:.92rem;white-space:pre-wrap;word-break:break-all}
.drop{border:2px dashed var(--line);border-radius:var(--r);padding:34px 16px;text-align:center;cursor:pointer;transition:.25s;background:var(--bg)}
.drop:hover,.drop.over{border-color:var(--pri);background:color-mix(in srgb,var(--pri) 6%,var(--bg))}
.drop strong{display:block;font-size:1.05rem;margin-bottom:4px}
.drop input{display:none}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:14px}
.thumb{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:8px;font-size:.82rem;animation:pop .35s var(--ease)}
.thumb img{width:100%;height:110px;object-fit:contain;border-radius:8px;background:repeating-conic-gradient(#0000000d 0 25%,transparent 0 50%) 0 0/14px 14px}
.thumb .btn{width:100%;margin-top:6px}
.stat-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.stat-row div{flex:1;min-width:110px;text-align:center;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:10px}
.stat-row strong{display:block;font-size:1.35rem;color:var(--pri)}
.stat-row span{font-size:.8rem;color:var(--muted);font-weight:600}
.check{display:flex;align-items:center;gap:8px;font-weight:600;font-size:.92rem;cursor:pointer}
.check input{width:18px;height:18px;accent-color:var(--pri)}
input[type=range]{width:100%;accent-color:var(--pri)}
input[type=color]{width:56px;height:44px;border:0;background:none;padding:0;cursor:pointer}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--r);margin:12px 0}
table{width:100%;border-collapse:collapse;font-size:.94rem}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg);font-weight:700;color:var(--ink2);white-space:nowrap}
tr:last-child td{border-bottom:0}
tbody tr{transition:background .2s}tbody tr:hover{background:color-mix(in srgb,var(--pri) 4%,transparent)}
.tt-grid td,.tt-grid th{min-width:110px}
.table-wrap td input,.table-wrap td select{min-width:84px}
#courses td:first-child input,#subs td:first-child input{min-width:140px}
#courses select{min-width:118px}
.table-wrap td .btn-sm{white-space:nowrap}
.tt-grid input{padding:6px 8px;font-size:.88rem;border-radius:8px}
.serp{background:#fff;color:#202124;border-radius:12px;padding:16px;border:1px solid #dadce0;font-family:Arial,sans-serif;max-width:620px}
.serp .u{font-size:.85rem;color:#202124}.serp .t{color:#1a0dab;font-size:1.25rem;line-height:1.3;margin:4px 0}.serp .d{font-size:.9rem;color:#4d5156}
.qr-out{display:flex;justify-content:center;margin:14px 0}
.qr-out canvas{background:#fff;border-radius:12px;padding:12px;box-shadow:var(--sh)}
.calc-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.calc-pad button{padding:14px 0;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:600 1.02rem var(--font);cursor:pointer;transition:.12s}
.calc-pad button:hover{border-color:var(--pri)}.calc-pad button:active{transform:scale(.95)}
.calc-pad .op{color:var(--pri)}.calc-pad .eq{background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;border:0}
.calc-screen{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin-bottom:12px;text-align:right;font-family:var(--mono)}
.calc-screen .ex{color:var(--muted);min-height:1.4em;word-break:break-all}
.calc-screen .an{font-size:2rem;font-weight:700;word-break:break-all}
.ytg{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin-top:16px}
.ytg figure{margin:0;background:var(--bg);border:1px solid var(--line);border-radius:14px;overflow:hidden;animation:pop .4s var(--ease) both}
.ytg img{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--line)}
.ytg figcaption{padding:10px;display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:.85rem;font-weight:600}
.swatch{height:90px;border-radius:14px;border:1px solid var(--line);transition:background .3s}
.pw-out{display:flex;gap:8px;align-items:stretch}.pw-out input{font-family:var(--mono);font-size:1.15rem}
.strength{height:8px;border-radius:99px;background:var(--line);margin-top:10px;overflow:hidden}.strength i{display:block;height:100%;width:0;transition:width .5s var(--ease),background .5s}

/* ===== Content ===== */
.quick-answer{margin:28px 0 0;padding:20px 22px;border-left:5px solid var(--pri);background:color-mix(in srgb,var(--pri) 6%,var(--card));border-radius:0 var(--r) var(--r) 0}
.quick-answer h2{font-size:1rem;text-transform:uppercase;letter-spacing:.06em;color:var(--pri);margin-bottom:6px}
.quick-answer p{margin:0;font-size:1.05rem;color:var(--ink)}
.toc{margin:24px 0 0;padding:18px 22px;background:var(--card);border:1px solid var(--line);border-radius:var(--r)}
.toc ol{margin:8px 0 0;padding-left:20px;columns:2;column-gap:30px}.toc li{margin:3px 0}
@media(max-width:640px){.toc ol{columns:1}}
.content{margin-top:20px;margin-bottom:40px}
.content-sec{margin-top:40px;scroll-margin-top:90px}
.content p,.content li{color:var(--ink2)}
.content ul,.content ol{padding-left:22px}
.content li{margin:6px 0}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding:12px 14px 12px 56px;background:var(--card);border:1px solid var(--line);border-radius:14px;margin:10px 0}
.steps li::before{content:counter(s);position:absolute;left:14px;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;font-weight:800;font-size:.9rem}
.formula{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.formula code,.formula .eq{display:block;font-family:var(--mono);background:var(--bg);border-radius:10px;padding:12px 14px;margin:8px 0;font-size:.98rem;overflow-x:auto;color:var(--ink)}
code{font-family:var(--mono);font-size:.92em;background:var(--bg);padding:2px 6px;border-radius:6px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:10px 0;transition:box-shadow .25s}
.faq details[open]{box-shadow:var(--sh)}
.faq summary{list-style:none;cursor:pointer;padding:15px 48px 15px 18px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.4rem;color:var(--pri);transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq summary h3{margin:0;font-size:1.02rem}
.faq-a{padding:0 18px 4px;animation:pop .3s var(--ease)}
.sources li{font-size:.92rem}
.author-box{display:flex;gap:14px;align-items:flex-start;margin-top:40px;padding:18px;border:1px solid var(--line);border-radius:var(--r);background:var(--card)}
.author-box p{margin:4px 0 0;font-size:.9rem;color:var(--muted)}
.related{background:var(--bg2);border-top:1px solid var(--line);padding:44px 0 50px}
.more-link{margin-top:18px;font-weight:700}.more-link a{text-decoration:none}
.prose h2{margin-top:32px}

/* ===== Footer ===== */
.site-footer{background:var(--bg2);border-top:1px solid var(--line);padding:48px 0 28px;margin-top:0}
.ft-top{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;margin-bottom:30px}
.ft-brand p{color:var(--muted);max-width:380px;margin-top:10px}
.ft-legal{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center}
.ft-legal a{color:var(--ink2);text-decoration:none;font-weight:600;font-size:.92rem}.ft-legal a:hover{color:var(--pri)}
.ft-cols{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:24px}
.ft-cols h3{font-size:.95rem}.ft-cols h3 a{color:var(--ink);text-decoration:none}
.ft-cols ul{list-style:none;padding:0;margin:0}.ft-cols li{margin:5px 0}
.ft-cols li a{color:var(--muted);text-decoration:none;font-size:.9rem}.ft-cols li a:hover{color:var(--pri)}
.copy{color:var(--muted);font-size:.85rem;margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}

/* ===== Toast ===== */
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,120px);background:var(--ink);color:var(--bg);padding:12px 20px;border-radius:12px;font-weight:600;box-shadow:var(--sh2);transition:transform .35s var(--ease),visibility .35s;z-index:100;visibility:hidden}
.toast.show{transform:translate(-50%,0);visibility:visible}

/* ===== Scroll reveal ===== */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .6s var(--ease) var(--d,0ms),transform .6s var(--ease) var(--d,0ms)}
.js .reveal.in{opacity:1;transform:none}
.js .tool-card.reveal.in:hover{transform:translateY(-4px)}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.js .reveal{opacity:1;transform:none}}
@media print{.site-header,.site-footer,.related,.toc,.btns,.hero-search,.blob{display:none!important}.tool-box{box-shadow:none;border:0}body{background:#fff}}