:root{--bg:#f5f6fb;--card:#fff;--text:#14162b;--muted:#5f6480;--line:#e6e8f2;--brand:#5b4dff;--brand2:#4a3be6;--soft:#efedff;--warn:#c2410c;--r:18px;
--grad:linear-gradient(135deg,#5b4dff 0%,#8b3dff 55%,#ff4d9d 100%);--shadow:0 1px 2px rgba(20,22,43,.04),0 8px 24px -8px rgba(20,22,43,.12)}
@media (prefers-color-scheme:dark){:root{--bg:#0d0e1a;--card:#161829;--text:#eceefa;--muted:#9da2bf;--line:#262942;--brand:#8b80ff;--brand2:#a69dff;--soft:#221f45;--warn:#fb923c;--shadow:0 8px 24px -8px rgba(0,0,0,.6)}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font:16px/1.65 "Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--brand)}
.wrap{max-width:960px;margin:0 auto;padding:0 18px}
/* header */
header.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--card) 82%,transparent);backdrop-filter:saturate(1.6) blur(14px);-webkit-backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.3rem;text-decoration:none;color:var(--text);letter-spacing:-.6px}
.logo i{width:34px;height:34px;border-radius:10px;background:var(--grad);display:grid;place-items:center;color:#fff;font-style:normal;font-size:1.05rem;box-shadow:0 6px 16px -6px #8b3dff}
.logo b{font-weight:800}.logo span{margin-left:5px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lang{font-size:.88rem;font-weight:600;text-decoration:none;border:1px solid var(--line);padding:7px 14px;border-radius:99px;color:var(--text);background:var(--card)}
.lang:hover{border-color:var(--brand);color:var(--brand)}
main{padding:0 0 48px}
/* hero */
.hero{background:var(--grad);color:#fff;padding:54px 0 64px;position:relative;overflow:hidden}
.hero:before,.hero:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12)}
.hero:before{width:380px;height:380px;right:-120px;top:-160px}
.hero:after{width:220px;height:220px;left:-80px;bottom:-120px}
.hero .wrap{position:relative;z-index:1;text-align:center}
.hero h1{font-size:clamp(1.9rem,5vw,3rem);line-height:1.12;margin:0 0 12px;letter-spacing:-1.2px}
.hero p{margin:0 auto 26px;max-width:640px;opacity:.92;font-size:1.06rem}
.search{width:100%;max-width:620px;font:inherit;font-size:1.05rem;padding:17px 22px 17px 52px;border-radius:99px;border:0;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%238b3dff' stroke-width='2.5' stroke-linecap='round'%3E%3Ccircle cx='9' cy='9' r='6.5'/%3E%3Cpath d='m14 14 4.5 4.5'/%3E%3C/svg%3E") no-repeat 20px center;color:#14162b;box-shadow:0 18px 40px -12px rgba(30,0,80,.45)}
.search:focus{outline:3px solid rgba(255,255,255,.55)}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:18px}
.chips a{color:#fff;text-decoration:none;font-size:.88rem;font-weight:600;padding:7px 14px;border-radius:99px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25)}
.chips a:hover{background:rgba(255,255,255,.28)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:-30px auto 6px;position:relative;z-index:2}
.stats div{background:var(--card);border-radius:16px;padding:14px 10px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--line)}
.stats b{display:block;font-size:1.25rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats small{color:var(--muted);font-size:.8rem}
@media (max-width:620px){.stats{grid-template-columns:repeat(2,1fr)}}
/* sections & cards */
h1{font-size:clamp(1.6rem,4.2vw,2.2rem);line-height:1.2;margin:.2em 0 .3em;letter-spacing:-.8px}
h2{font-size:1.3rem;margin:1.8em 0 .7em;letter-spacing:-.3px}
.cat h2{display:flex;align-items:center;gap:10px}
.cat h2:before{content:"";width:6px;height:22px;border-radius:4px;background:var(--grad)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.card{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;text-decoration:none;color:var(--text);transition:transform .18s,box-shadow .18s,border-color .18s;box-shadow:var(--shadow)}
.card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--brand) 45%,var(--line));box-shadow:0 14px 34px -14px rgba(91,77,255,.45)}
.ic{flex:none;width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:1.45rem;background:var(--soft)}
.card b{display:block;margin-bottom:3px;line-height:1.3}
.card small{color:var(--muted);line-height:1.45;display:block;font-size:.86rem}
.c-edu .ic{background:#e9f0ff}.c-finance .ic{background:#e6f8ef}.c-math .ic{background:#fff3e2}.c-health .ic{background:#ffe9f0}.c-date .ic{background:#efe8ff}.c-text .ic{background:#e5f6fb}.c-other .ic{background:#f1f2f6}
@media (prefers-color-scheme:dark){.card .ic{background:var(--soft)!important}}
/* tool page */
.thead{background:var(--grad);color:#fff;padding:28px 0 70px}
.thead .crumb,.thead .crumb a{color:rgba(255,255,255,.85)}
.thead .row{display:flex;gap:16px;align-items:center;margin-top:8px}
.thead .ic{width:60px;height:60px;font-size:1.9rem;border-radius:18px;background:rgba(255,255,255,.2)!important;flex:none}
.thead h1{margin:0;color:#fff}
.thead p{margin:10px 0 0;opacity:.92;max-width:720px}
.crumb{font-size:.85rem}
.box{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:0 20px 50px -24px rgba(40,20,120,.35);margin-top:-48px;position:relative}
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.field label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px}
.field.wide{grid-column:1/-1}
input[type=number],input[type=date],input[type=text],select,textarea{width:100%;font:inherit;color:var(--text);background:var(--bg);border:1.5px solid var(--line);border-radius:12px;padding:11px 13px;transition:border-color .15s,box-shadow .15s}
textarea{min-height:170px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 18%,transparent)}
.check{display:flex;align-items:center;gap:9px;font-weight:600!important;cursor:pointer}
.check input{width:20px;height:20px;accent-color:var(--brand)}
.btn{background:var(--grad);color:#fff;border:0;border-radius:12px;padding:13px 28px;font:inherit;font-weight:700;cursor:pointer;margin-top:18px;box-shadow:0 10px 22px -10px #8b3dff;transition:transform .15s,filter .15s}
.btn:hover{transform:translateY(-1px);filter:brightness(1.06)}
.btn:active{transform:none}
.help{font-size:.8rem;color:var(--muted);margin-top:5px;line-height:1.45}
#result{margin-top:20px}
.rows{margin:0;display:grid;gap:8px}
.rows div{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-radius:12px;background:var(--bg);flex-wrap:wrap;animation:pop .25s ease}
.rows dt{color:var(--muted)}
.rows dd{margin:0;font-weight:700;text-align:right}
.rows .main{background:var(--grad);padding:18px 20px;color:#fff}
.rows .main dt{color:rgba(255,255,255,.9);font-weight:600}
.rows .main dd{font-size:1.6rem;letter-spacing:-.5px}
@keyframes pop{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.outtext{margin-top:10px;min-height:120px}
.hint{color:var(--muted);margin:0;padding:14px 16px;background:var(--bg);border-radius:12px;border:1.5px dashed var(--line)}
.hint.warn{color:var(--warn);border-color:currentColor}
article,.faq{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:6px 24px 18px;margin-top:22px}
.faq{padding-bottom:14px}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq details:last-child{border:0}
.faq summary{font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--brand);font-size:1.3rem;line-height:1}
.faq details[open] summary:after{content:"–"}
.faq p{margin:.6em 0 0;color:var(--muted)}
.ad{margin:22px 0;text-align:center}
.note{font-size:.86rem;color:var(--muted);background:var(--bg);border-radius:12px;padding:10px 14px;border-left:4px solid var(--brand)}
.page{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:8px 26px 20px;margin-top:28px}
footer{background:#14162b;color:#b7bbd6;padding:34px 0 40px;font-size:.9rem}
footer a{color:#e3e5f5;margin-right:16px;text-decoration:none}
footer a:hover{text-decoration:underline}
footer .logo{color:#fff;margin-bottom:10px}
/* exam & row tables */
.rgroup h3{margin:4px 0 10px;font-size:1.05rem;display:inline-block;padding:4px 12px;border-radius:99px;background:var(--soft);color:var(--brand)}
.rgroup+.rgroup{margin-top:18px}
.rgrid{display:grid;gap:8px;align-items:center}
.rgrid>span{font-size:.78rem;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.4px}
.rrow{display:contents}
.rgrid.ex{grid-template-columns:1fr 84px 84px}
.rgrid.ex b{font-weight:600;font-size:.95rem}
.rgrid.ex small{color:var(--muted);font-weight:400}
.rgrid.dyn.c3{grid-template-columns:1fr 90px 110px 38px}
.rgrid input,.rgrid select{padding:9px 10px}
.rm{background:none;border:1.5px solid var(--line);border-radius:10px;color:var(--muted);height:42px;cursor:pointer;font-size:1.1rem}
.rm:hover{color:#e11d48;border-color:#e11d48}
.btn.ghost{background:var(--soft);color:var(--brand);margin-top:12px;padding:9px 18px;box-shadow:none}
@media (max-width:520px){.rgrid.dyn.c3{grid-template-columns:1fr 62px 90px 32px}.rgrid.ex{grid-template-columns:1fr 64px 64px}.box{padding:18px}.thead .ic{width:50px;height:50px;font-size:1.6rem}}
.drop{display:flex;flex-direction:column;align-items:center;gap:6px;padding:34px 18px;border:2px dashed color-mix(in srgb,var(--brand) 45%,var(--line));border-radius:18px;background:var(--soft);cursor:pointer;text-align:center;transition:.15s}
.drop:hover,.drop.on{border-color:var(--brand);transform:scale(1.01)}
.drop .dz-ic{font-size:2.4rem}
.drop u{color:var(--brand)}
.drop small{color:var(--muted)}
.flist{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:8px}
.flist li{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 14px;background:var(--bg);border-radius:12px;font-weight:600;word-break:break-all}
.flist small{color:var(--muted);font-weight:400}
.flist button{background:var(--card);border:1px solid var(--line);border-radius:8px;width:32px;height:32px;margin-left:4px;cursor:pointer;color:var(--text)}
.flist button:hover{border-color:var(--brand);color:var(--brand)}
.done{padding:18px;border-radius:16px;background:var(--soft);text-align:center}
.done p{margin:0 0 12px}
.btn.dl{display:inline-block;text-decoration:none;margin:4px 0}
.btn:disabled{opacity:.6;cursor:wait}
.preview{width:100%;height:420px;border:1px solid var(--line);border-radius:12px;background:#fff;margin-top:14px}