:root{
  --bg:#f6f7f9;--surface:#fff;--surface-2:#f0f2f5;--border:#e6e8eb;
  --text:#161823;--muted:#5b6270;--cyan:#25f4ee;--pink:#fe2c55;
  --radius:16px;--shadow:0 1px 2px rgba(22,24,35,.06),0 10px 30px rgba(22,24,35,.08);
  --shadow-lg:0 24px 60px rgba(22,24,35,.16);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--maxw:960px}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--pink);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;font-weight:800;letter-spacing:-.02em}
h1{font-size:clamp(1.7rem,4.5vw,2.5rem)}h2{font-size:clamp(1.3rem,3vw,1.7rem)}h3{font-size:1.1rem}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px}.muted{color:var(--muted)}
.grad{background:linear-gradient(92deg,var(--pink),#7d2ae8 55%,var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;height:60px;gap:14px}
.brand{display:flex;align-items:center;gap:9px;font-weight:900;color:var(--text);font-size:1.05rem}.brand:hover{text-decoration:none}
.brand .logo{width:32px;height:32px;border-radius:9px;background:var(--text);display:grid;place-items:center}
.brand .logo svg{width:20px;height:20px}
.nav-links{margin-left:auto;display:flex;gap:2px}.nav-links a{color:var(--muted);font-weight:600;padding:7px 11px;border-radius:9px;font-size:.92rem}.nav-links a:hover{background:var(--surface-2);color:var(--text);text-decoration:none}
.nav-links a.active{color:var(--text);background:var(--surface-2)}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:6px}.breadcrumb a{color:var(--muted)}
.cross{text-align:center;margin:18px 0 0;font-size:.95rem;color:var(--muted)}
.hero{padding:40px 0 8px;text-align:center}
.hero p.lead{font-size:1.12rem;color:var(--muted);max-width:60ch;margin:10px auto 0}
.chips{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:18px 0 4px}
.chip{background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:6px 13px;font-size:.85rem;font-weight:600;color:var(--muted)}
.calc-section{padding:22px 0}
.calc-section.alt{background:var(--surface-2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-h{text-align:center;margin:6px 0 2px}.sec-sub{text-align:center;max-width:52ch;margin:0 auto 20px}
.calc-grid{display:grid;grid-template-columns:1fr;gap:18px}@media(min-width:780px){.calc-grid{grid-template-columns:1fr 1fr}}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel-h{font-size:1.15rem;margin:0 0 16px}
.field{margin-bottom:15px}.field:last-child{margin-bottom:0}
.field label{display:block;font-size:.92rem;font-weight:700;margin-bottom:7px}
.field .fh{font-weight:500;color:var(--muted);font-size:.82rem}
.input-wrap{display:flex;align-items:center;border:1px solid var(--border);border-radius:12px;background:var(--surface-2);overflow:hidden}
.input-wrap:focus-within{border-color:var(--pink);box-shadow:0 0 0 3px rgba(254,44,85,.14);background:#fff}
.input-wrap input{flex:1;border:0;background:transparent;padding:13px;font:inherit;font-size:1.05rem;color:var(--text);width:100%}
.input-wrap input:focus{outline:none}
/* username lookup */
.tt-lookup{text-align:center;max-width:560px;margin:0 auto}
.tt-lookup .panel-h{margin-bottom:16px}
.lookup-row{display:flex;align-items:center;border:1px solid var(--border);border-radius:12px;background:var(--surface-2);overflow:hidden;margin-bottom:12px}
.lookup-row:focus-within{border-color:var(--pink);box-shadow:0 0 0 3px rgba(254,44,85,.14);background:#fff}
.lookup-row .at{padding:0 4px 0 14px;color:var(--muted);font-weight:800;font-size:1.05rem}
.lookup-row input{flex:1;border:0;background:transparent;padding:14px 14px 14px 4px;font:inherit;font-size:1.05rem;color:var(--text)}
.lookup-row input:focus{outline:none}
.btn{display:block;width:100%;padding:14px;border:0;border-radius:12px;background:linear-gradient(92deg,var(--pink),#7d2ae8);color:#fff;font-weight:800;font-size:1.02rem;cursor:pointer}
.btn:active{transform:translateY(1px)}
.lookup-hint{font-size:.82rem;color:var(--muted);margin:0 0 12px;line-height:1.5;text-align:left}
.link-btn{background:none;border:0;color:var(--muted);font-weight:600;font-size:.9rem;cursor:pointer;margin-top:12px;text-decoration:underline;padding:4px}
.link-btn:hover{color:var(--pink)}
.loading,.notice{max-width:560px;margin:16px auto 0;text-align:center;color:var(--muted)}
.notice{background:#fff8e6;border-color:#f6e6b8;color:#7a5c00}
.spinner{display:inline-block;width:15px;height:15px;border:2px solid var(--border);border-top-color:var(--pink);border-radius:50%;vertical-align:-2px;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
/* account card */
.acct-card{max-width:560px;margin:16px auto 0}
.acct-head{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.acct-avatar{width:64px;height:64px;border-radius:50%;object-fit:cover;background:var(--surface-2);flex:none}
.acct-avatar.ph{display:grid;place-items:center;font-size:1.6rem;font-weight:800;color:var(--muted)}
.acct-name{font-weight:800;font-size:1.15rem;display:flex;align-items:center;gap:6px}
.acct-user{color:var(--muted);font-size:.92rem}
.vbadge{display:inline-grid;place-items:center;width:18px;height:18px;border-radius:50%;background:#25f4ee;color:#161823;font-size:.7rem;font-weight:900}
.acct-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:6px}
.acct-stats .stat{background:var(--surface-2);border-radius:12px;padding:12px 8px;text-align:center}
.acct-stats .stat b{display:block;font-size:1.2rem;font-weight:900}
.acct-stats .stat span{font-size:.82rem;color:var(--muted)}
.result.inner{margin-top:16px;padding:18px}
.result{background:linear-gradient(165deg,#fff,#fdf3f5);border-color:#fbd9e1}
.res-main{text-align:center;padding:4px 0 16px;border-bottom:1px dashed #f3c6d1;margin-bottom:14px}
.res-main .lbl{font-size:.9rem;color:var(--muted);font-weight:600}
.res-main .val{font-size:clamp(1.5rem,4.5vw,2rem);font-weight:900;letter-spacing:-.02em;line-height:1.15;margin-top:4px;background:linear-gradient(92deg,var(--pink),#7d2ae8);-webkit-background-clip:text;background-clip:text;color:transparent}
.res-main .sub{font-size:.9rem;color:var(--muted);margin-top:6px}
.res-row{display:flex;justify-content:space-between;gap:12px;padding:10px 2px;font-size:.96rem;border-bottom:1px solid #f2e3e7}
.res-row:last-child{border-bottom:0}.res-row b{font-weight:750;text-align:right}
.res-note{font-size:.82rem;color:var(--muted);margin:14px 0 0;line-height:1.5}
.prose{max-width:760px;margin:0 auto;padding:10px 18px}.prose h2{margin-top:1.6em}.prose h3{margin-top:1.3em}
.prose ul,.prose ol{padding-left:1.2em}.prose li{margin:.35em 0}
.steps{counter-reset:s;list-style:none;padding:0;margin:1em 0}
.steps li{position:relative;padding:14px 16px 14px 54px;background:var(--surface);border:1px solid var(--border);border-radius:12px;margin-bottom:10px}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:14px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--pink),#7d2ae8);color:#fff;font-weight:800;display:grid;place-items:center;font-size:.9rem}
.callout{background:#fff8e6;border:1px solid #f6e6b8;border-radius:12px;padding:14px 16px;margin:1.2em 0;font-size:.95rem}
.callout b{color:#8a6d00}
.table-wrap{overflow-x:auto;margin:1em 0}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:420px}
th,td{border:1px solid var(--border);padding:10px 12px;text-align:left}th{background:var(--surface-2);font-weight:700}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:2px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--pink);font-weight:800}.faq details[open] summary::after{content:"\2212"}
.faq details p{padding:0 0 14px;margin:0;color:var(--muted)}
.related-wrap{background:var(--surface-2);border-top:1px solid var(--border);padding:30px 0;margin-top:20px}
.rel-h{text-align:center;font-size:1.2rem;margin-bottom:18px}
.related{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));max-width:var(--maxw);margin:0 auto}
.tool-card{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px;color:var(--text)}
.tool-card:hover{text-decoration:none;border-color:var(--pink);box-shadow:var(--shadow);transform:translateY(-2px);transition:.15s}
.tool-card .tc-ic{font-size:1.5rem;flex:none}
.tool-card .tc-body{display:flex;flex-direction:column}
.tool-card .tc-body b{font-size:.98rem}.tool-card .tc-body small{color:var(--muted);font-size:.82rem}
.site-footer{border-top:1px solid var(--border);margin-top:44px;background:var(--surface);padding:26px 0;text-align:center;color:var(--muted);font-size:.88rem}
.site-footer a{color:var(--muted)}.disc{max-width:620px;margin:8px auto 0;font-size:.8rem;line-height:1.5}