:root{
  --ink:#171923; --body:#454B57; --muted:#6B7280; --bg:#FFFFFF; --soft:#F7F8FC; --line:#E6E8EF;
  --accent:#5B4BDB; --accent-2:#8B5CF6; --accent-ink:#3B2FA8; --accent-soft:#EEEBFD; --ok:#16845B; --warn:#9A5B00; --err:#B42318;
  --card:#FFFFFF; --line2:#CFD2DD; --hover:#FCFCFF; --inv-bg:#171923; --inv-fg:#FFFFFF; --inv-hover:#2B2F40; --fav:#C2255C;
  --r:10px; --shadow:0 1px 2px rgba(23,25,35,.05),0 6px 20px rgba(23,25,35,.06);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --glyph:system-ui,-apple-system,"Segoe UI","Noto Sans","Noto Sans Math","Noto Sans Symbols","Noto Sans Symbols 2","Noto Sans CJK SC","Apple Symbols","Segoe UI Symbol","Segoe UI Emoji","Noto Color Emoji",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--body);font:16px/1.65 var(--font);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:var(--accent-ink);text-underline-offset:3px}
a:hover{color:var(--accent)}
h1,h2,h3{color:var(--ink);line-height:1.2;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.6vw,3rem);font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:750}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}
ul,ol{padding-left:1.2em;margin:0 0 1em}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.sr-only{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-999px;top:8px;background:var(--inv-bg);color:var(--inv-fg);padding:.6rem 1rem;border-radius:8px;z-index:100}
.skip:focus{left:8px}
.wrap{width:min(1120px,100% - 32px);margin-inline:auto}
.narrow{width:min(780px,100% - 32px);margin-inline:auto}
section{padding:clamp(40px,6vw,72px) 0}
.soft{background:var(--soft);border-block:1px solid var(--line)}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:.6rem}
.lead{font-size:1.125rem;color:var(--body);max-width:60ch}

/* header */
.site-header{background:var(--card);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:800;font-size:1.35rem;letter-spacing:-.03em;color:var(--ink)}
.brand .word span{color:var(--accent)}
.brand .mark{width:28px;height:28px;border-radius:8px;background:var(--inv-bg);color:var(--inv-fg);display:grid;place-items:center;font-size:.95rem;font-weight:800;letter-spacing:0;position:relative}
.brand .mark::after{content:"";position:absolute;right:5px;bottom:5px;width:5px;height:5px;border-radius:50%;background:var(--accent-2)}
.nav{display:flex;align-items:center;gap:4px}
.nav>a,.nav summary{padding:.5rem .8rem;border-radius:8px;color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem;cursor:pointer;list-style:none}
.nav summary::-webkit-details-marker{display:none}
.nav summary::after{content:"";display:inline-block;margin-left:.4rem;width:.4em;height:.4em;border:solid currentColor;border-width:0 2px 2px 0;transform:rotate(45deg) translateY(-2px)}
.nav>a:hover,.nav summary:hover{background:var(--soft)}
.nav a[aria-current="page"]{color:var(--accent-ink);background:var(--accent-soft)}
.nav details{position:relative}
.menu{position:absolute;top:calc(100% + 6px);left:0;min-width:230px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:6px;z-index:20}
.menu a{display:block;padding:.55rem .75rem;border-radius:8px;color:var(--ink);text-decoration:none;font-size:.95rem}
.menu a:hover{background:var(--soft);color:var(--accent-ink)}
#nav-toggle{display:none;background:var(--card);border:1px solid var(--line);border-radius:8px;width:44px;height:44px;cursor:pointer;color:var(--ink)}

/* buttons */
.btn{font:inherit;font-weight:650;font-size:.95rem;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:8px;padding:.6rem 1rem;cursor:pointer;min-height:44px;transition:background .15s,border-color .15s,color .15s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:.4rem}
.btn:hover{border-color:var(--line2);background:var(--soft)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:#4a3cc4;border-color:#4a3cc4;color:#fff}
.btn-lg{min-height:52px;padding:.75rem 1.4rem;font-size:1.02rem}
.btn-ghost{border-color:transparent;color:var(--accent-ink)}
.btn-ghost:hover{background:var(--accent-soft);border-color:transparent}
.btn-copy{min-width:78px;background:var(--inv-bg);color:var(--inv-fg);border-color:var(--inv-bg)}
.btn-copy:hover{background:var(--inv-hover);border-color:var(--inv-hover)}
.btn-copy.is-done{background:var(--ok);border-color:var(--ok)}
.icon-btn{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:8px;border:1px solid transparent;background:transparent;color:var(--muted);cursor:pointer}
.icon-btn:hover{background:var(--soft)}
.icon-btn svg{fill:none;stroke:currentColor;stroke-width:2;stroke-linejoin:round}
.icon-btn.on{color:var(--fav)}
.icon-btn.on svg{fill:currentColor}
.chip{font:inherit;font-size:.9rem;font-weight:600;padding:.4rem .85rem;min-height:38px;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;cursor:pointer}
.chip:hover{border-color:var(--line2);background:var(--soft)}
.chip.active{background:var(--accent);border-color:var(--accent);color:#fff}

/* hero */
.hero{padding:clamp(28px,4vw,48px) 0 clamp(20px,3vw,32px)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(24px,4vw,56px);align-items:center}
.hero h1 .hl{color:var(--accent)}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:1.2rem 0 1rem}
.points{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;padding:0;margin:0;font-size:.92rem;color:var(--muted)}
.points li::before{content:"\2713";color:var(--ok);font-weight:800;margin-right:.4em}
.preview{border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:var(--shadow);padding:18px}
.preview-top{display:flex;align-items:center;gap:10px;border:1px solid var(--line);background:var(--soft);border-radius:10px;padding:.6rem .8rem;font-weight:650;color:var(--ink);margin-bottom:12px}
.preview-top small{margin-left:auto;font-weight:500;color:var(--muted)}
.preview ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.preview li{display:flex;justify-content:space-between;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:.55rem .8rem;font-family:var(--glyph);font-size:1.1rem;color:var(--ink)}
.preview li em{font-family:var(--font);font-style:normal;font-size:.78rem;color:var(--muted)}
.preview p{font-size:.82rem;color:var(--muted);margin:10px 0 0}

/* tool */
.tool{padding-top:8px}
.tool-card{border:1px solid var(--line);border-radius:16px;background:var(--card);box-shadow:var(--shadow);padding:clamp(16px,3vw,28px)}
.tool-card>h2{font-size:1.25rem;margin-bottom:.9rem}
label.lbl{display:block;font-weight:700;color:var(--ink);margin-bottom:.4rem}
.field-row{display:flex;gap:10px;flex-wrap:wrap}
.field{position:relative;flex:1 1 320px}
.field input{width:100%;min-height:56px;font:inherit;font-size:1.15rem;padding:.7rem 4.6rem .7rem 1rem;border:1.5px solid var(--line2);border-radius:10px;color:var(--ink);background:var(--card)}
.field input:focus{outline:3px solid rgba(91,75,219,.28);border-color:var(--accent)}
.field input[aria-invalid="true"]{border-color:var(--err)}
.counter{position:absolute;right:14px;top:50%;transform:translateY(-50%);font-size:.8rem;color:var(--muted);pointer-events:none}
.counter.over{color:var(--err);font-weight:700}
.field-msg{min-height:1.4em;margin:.4rem 0 0;color:var(--err);font-size:.92rem}
.actions{display:flex;flex-wrap:wrap;gap:10px}
.options{display:flex;flex-wrap:wrap;gap:14px 20px;align-items:end;margin:.4rem 0 1rem}
.options label{font-size:.85rem;font-weight:650;color:var(--ink);display:block;margin-bottom:.25rem}
.options select{font:inherit;min-height:42px;padding:.4rem .7rem;border:1px solid var(--line2);border-radius:8px;background:var(--card);color:var(--ink);max-width:100%}
.fine{font-size:.84rem;color:var(--muted);margin:0}
.recent{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:.9rem}
.recent .fine{margin-right:4px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:1rem 0;overflow-x:auto}
.tabs [role="tab"]{font:inherit;font-weight:700;color:var(--muted);background:none;border:0;border-bottom:3px solid transparent;padding:.7rem 1rem;min-height:44px;cursor:pointer;white-space:nowrap}
.tabs [role="tab"][aria-selected="true"]{color:var(--accent-ink);border-bottom-color:var(--accent)}
.tabs [role="tab"]:hover{color:var(--ink)}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:1rem}
.results-head{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;align-items:center;margin-bottom:.6rem}
.results-head p{margin:0}
ul.results{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.result{display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid var(--line);border-radius:10px;padding:.5rem .6rem .5rem .9rem;background:var(--card)}
.result:hover{border-color:var(--line2);background:var(--hover)}
.result.none{color:var(--muted);justify-content:center;text-align:center;padding:1.2rem}
.result-main{min-width:0;display:flex;flex-direction:column}
.result-text{font-family:var(--glyph);font-size:1.25rem;color:var(--ink);overflow-wrap:anywhere;line-height:1.4}
.result-tag{font-size:.78rem;color:var(--muted)}
.result-tag.warn{color:var(--warn)}
.result-tag.over{color:var(--err)}
.result-actions{display:flex;align-items:center;gap:4px;flex-shrink:0}
.more{display:flex;justify-content:center;margin-top:12px}
.empty{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0 0 .9rem}
.note{margin-top:1rem;font-size:.86rem;color:var(--muted);border-left:3px solid var(--accent-soft);padding-left:.8rem}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:var(--inv-bg);color:var(--inv-fg);padding:.65rem 1rem;border-radius:10px;font-size:.92rem;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:60;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.error{background:var(--err)}

/* content */
.grid{display:grid;gap:16px}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:12px;background:var(--card);padding:1.2rem}
.card h3{margin-bottom:.4rem}
.card p:last-child{margin-bottom:0}
a.card{text-decoration:none;color:inherit;display:block;transition:border-color .15s,transform .15s,box-shadow .15s}
a.card:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateY(-2px)}
a.card .go{color:var(--accent-ink);font-weight:650;font-size:.9rem}
.cat-ico{width:36px;height:36px;border-radius:9px;background:var(--accent-soft);color:var(--accent-ink);display:grid;place-items:center;font-family:var(--glyph);font-size:1.1rem;margin-bottom:.7rem}
.sec-head{max-width:68ch;margin-bottom:1.6rem}
.copy-list{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.copy-list li{display:flex;justify-content:space-between;align-items:center;gap:8px;border:1px solid var(--line);background:var(--card);border-radius:8px;padding:.25rem .3rem .25rem .8rem;font-family:var(--glyph);color:var(--ink)}
.copy-list .btn{min-height:36px;padding:.3rem .7rem;font-size:.85rem;background:var(--card);color:var(--accent-ink);border-color:var(--line)}
.copy-list .btn:hover{background:var(--accent-soft)}
.copy-list .btn.is-done{background:var(--ok);color:#fff;border-color:var(--ok)}
.steps{list-style:none;counter-reset:s;padding:0;display:grid;gap:12px}
.steps li{counter-increment:s;display:grid;grid-template-columns:40px 1fr;gap:14px;align-items:start}
.steps li::before{content:counter(s);width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:800}
.steps strong{color:var(--ink)}
.figure{margin:1.4rem 0;border:1px solid var(--line);border-radius:14px;background:var(--card);padding:12px 12px 8px}
.figure figcaption{font-size:.85rem;color:var(--muted);padding:6px 6px 2px}
.figure svg{display:block;width:100%;height:auto}
.figure text{font-family:var(--font)}
.tbl{width:100%;border-collapse:collapse;font-size:.95rem;background:var(--card)}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
.tbl th,.tbl td{padding:.6rem .9rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--soft);color:var(--ink);font-weight:700;white-space:nowrap}
.tbl tr:last-child td{border-bottom:0}
.tbl .g{font-family:var(--glyph);font-size:1.1rem;color:var(--ink);overflow-wrap:anywhere}
details.faq{border:1px solid var(--line);border-radius:10px;background:var(--card);margin-bottom:10px}
details.faq summary{cursor:pointer;padding:1rem 1.1rem;font-weight:700;color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:12px}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-weight:700;color:var(--accent)}
details.faq[open] summary::after{content:"\2212"}
details.faq .ans{padding:0 1.1rem 1rem}
details.faq .ans p:last-child{margin-bottom:0}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:1rem}
.crumbs a{color:var(--muted)}
.page-hero{padding:clamp(28px,5vw,56px) 0 clamp(8px,2vw,16px)}
.prose h2{margin-top:2rem}
.prose h3{margin-top:1.4rem}
.cta-band{border:1px solid var(--line);background:var(--accent-soft);border-radius:14px;padding:1.4rem;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
.cta-band p{margin:0;color:var(--ink);font-weight:600}
.related{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0}
.related a{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:.35rem .9rem;text-decoration:none;color:var(--ink);font-weight:600;font-size:.9rem;background:var(--card)}
.related a:hover{border-color:var(--accent);color:var(--accent-ink)}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--card);padding:40px 0 28px;font-size:.93rem}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.foot h2{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:.7rem;color:var(--ink)}
.foot ul{list-style:none;padding:0;margin:0;display:grid;gap:.4rem}
.foot a{color:var(--body);text-decoration:none}
.foot a:hover{color:var(--accent);text-decoration:underline}
.legal{border-top:1px solid var(--line);margin-top:28px;padding-top:18px;color:var(--muted);font-size:.85rem}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .foot{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  #nav-toggle{display:inline-grid;place-items:center}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--card);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px 16px;z-index:30;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .site-header{position:relative}
  .menu{position:static;box-shadow:none;border:0;padding:0 0 0 12px}
  .nav details{width:100%}
}
@media (max-width:560px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .foot{grid-template-columns:1fr}
  .result{flex-direction:column;align-items:stretch}
  .result-actions{justify-content:flex-end}
  .field input{font-size:1.05rem}
  .actions .btn{flex:1 1 auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
}

/* tool-first home */
.tool-top{padding:clamp(24px,4vw,44px) 0 clamp(20px,3vw,32px)}
.tool-wrap{max-width:900px}
.tool-intro{text-align:center;margin-bottom:1.3rem}
.tool-intro .lead{margin:.6rem auto 0;max-width:62ch}
.tool-top .points{justify-content:center;margin-top:1rem}
.head-actions{display:flex;gap:8px;flex-wrap:wrap}
.opts{margin:.2rem 0 1rem}
.opts>summary{cursor:pointer;font-weight:650;color:var(--accent-ink);font-size:.92rem}
.opts[open]>summary{margin-bottom:.8rem}
#filters{min-height:44px}
[hidden]{display:none!important}
@media (max-width:560px){.tabs [role="tab"]{padding:.7rem .6rem;font-size:.92rem}.tabs{gap:0}}
@media (max-width:420px){.tabs [role="tab"]{padding:.7rem .4rem;font-size:.88rem}}

/* dark (black and white) theme */
:root[data-theme="dark"]{
  color-scheme:dark;
  --ink:#F5F6FA; --body:#C7CAD4; --muted:#9AA0AE; --bg:#000000; --soft:#0E0E13; --line:#262733;
  --accent:#6B5BE8; --accent-2:#A78BFA; --accent-ink:#C4BCFF; --accent-soft:#1D1A3D; --ok:#3DD598; --warn:#F5B84B; --err:#FF7A70;
  --card:#0A0A0F; --line2:#3A3C4D; --hover:#12121A; --inv-bg:#F5F6FA; --inv-fg:#0B0B10; --inv-hover:#DADCE8; --fav:#FF6B9A;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 6px 20px rgba(0,0,0,.45);
}
:root[data-theme="dark"] a:hover{color:#DDD8FF}
:root[data-theme="dark"] .field input:focus{outline-color:rgba(167,139,250,.35)}
.theme-btn{display:inline-grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);cursor:pointer}
.theme-btn:hover{background:var(--soft);border-color:var(--line2)}
.theme-btn .i-sun{display:none}
:root[data-theme="dark"] .theme-btn .i-moon{display:none}
:root[data-theme="dark"] .theme-btn .i-sun{display:block}
.bar-end{display:flex;align-items:center;gap:8px}
.social{display:flex;flex-wrap:wrap;gap:10px;margin-top:1rem}
.social a{display:inline-grid;place-items:center;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;color:var(--ink);background:var(--card)}
.social a:hover{border-color:var(--accent);color:var(--accent-ink);text-decoration:none}
.social svg{width:20px;height:20px;fill:currentColor}
/* infographic colors follow the theme */
.f-ink{fill:var(--ink)}.f-muted{fill:var(--muted)}.f-card{fill:var(--card)}.f-chip{fill:var(--accent-soft)}.f-chipink{fill:var(--accent-ink)}.s-line{stroke:var(--line2)}.s-card{stroke:var(--line)}
.figure foreignObject div{color:var(--body)!important}

/* team and trust */
.team{display:grid;gap:20px;margin:1rem 0 2rem}
.person{display:grid;grid-template-columns:200px 1fr;gap:22px;border:1px solid var(--line);border-radius:14px;background:var(--card);padding:20px;box-shadow:var(--shadow)}
.person img{width:200px;height:auto;aspect-ratio:4/5;object-fit:cover;border-radius:12px;border:1px solid var(--line)}
.person h3{font-size:1.4rem;margin:.4rem 0 .6rem}
.person h4{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink);margin:1rem 0 .4rem}
.person ul{margin:0 0 .8rem}
.person-links{margin:0;font-weight:600}
.role{display:inline-block;background:var(--accent-soft);color:var(--accent-ink);border-radius:999px;padding:.2rem .75rem;font-size:.82rem;font-weight:700}
.byline{color:var(--muted);font-size:.95rem;max-width:62ch}
.by-strip{display:flex;gap:18px;align-items:center}
.avatars{display:flex;flex:none}
.avatars img{width:56px;height:56px;border-radius:50%;object-fit:cover;border:3px solid var(--bg)}
.avatars img+img{margin-left:-14px}
@media (max-width:640px){.person{grid-template-columns:1fr}.person img{width:100%;max-width:280px}.by-strip{flex-direction:column;align-items:flex-start}}