:root{--bg:#f4f7fb;--surface:#fff;--surface-2:#eef2f8;--border:#e2e8f2;--text:#111827;--muted:#5b6478;--brand:#0ea5a4;--brand-2:#0d8a89;--ring:rgba(14,165,164,.25);--radius:14px;--shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.08);--shadow-lg:0 20px 55px rgba(16,24,40,.14);--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--maxw:1060px}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand);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(1.6rem,4vw,2.2rem)}h2{font-size:clamp(1.25rem,3vw,1.6rem)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px}.muted{color:var(--muted)}
.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;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-weight:900;color:var(--text)}.brand:hover{text-decoration:none}
.brand .logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff}
.nav-links{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}.nav-links a{color:var(--muted);font-weight:600;padding:7px 10px;border-radius:9px;font-size:.9rem}.nav-links a:hover{background:var(--surface-2);color:var(--text);text-decoration:none}
.hero{padding:44px 0 20px;text-align:center}.hero p.lead{font-size:1.1rem;color:var(--muted);max-width:56ch;margin:0 auto}
.grid{display:grid;gap:15px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));padding:18px 0}
.cat-title{font-size:1.1rem;font-weight:800;margin:22px 0 10px;display:flex;gap:10px;align-items:center}.cat-title .line{height:1px;background:var(--border);flex:1}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;gap:6px;color:var(--text);transition:transform .12s,border-color .2s,box-shadow .2s}
.card:hover{text-decoration:none;transform:translateY(-3px);border-color:var(--brand);box-shadow:var(--shadow-lg)}
.card .ic{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;font-size:23px;background:var(--surface-2)}
.card h3{font-size:1.03rem;margin:2px 0 0}.card p{font-size:.88rem;color:var(--muted);margin:0}
.section{padding:20px 0}.breadcrumb{font-size:.85rem;color:var(--muted);padding:14px 0 0}.breadcrumb a{color:var(--muted)}
.calc-wrap{display:grid;grid-template-columns:1fr;gap:20px;padding:20px 0}@media(min-width:760px){.calc-wrap{grid-template-columns:1.05fr .95fr}}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.field{margin-bottom:15px}.field label{display:block;font-size:.9rem;font-weight:700;margin-bottom:7px}
.input-wrap{display:flex;align-items:center;border:1px solid var(--border);border-radius:11px;background:var(--surface-2);overflow:hidden}
.input-wrap:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px var(--ring);background:#fff}
.input-wrap .aff{padding:0 12px;color:var(--muted);font-weight:600}.input-wrap input,.input-wrap select{flex:1;border:0;background:transparent;padding:12px;font:inherit;font-size:1rem;color:var(--text);width:100%}.input-wrap input:focus,.input-wrap select:focus{outline:none}
.btn{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:13px;border:0;border-radius:11px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800;font-size:1rem;cursor:pointer}
.btn:active{transform:translateY(1px)}
.result{background:linear-gradient(160deg,#e9fbfa,#f5fffe);border:1px solid #cfeeed}
.res-main{text-align:center;padding:6px 0 14px;border-bottom:1px dashed #bfe6e5;margin-bottom:14px}.res-main .lbl{font-size:.9rem;color:var(--muted);font-weight:600}
.res-main .val{font-size:2rem;font-weight:900;color:var(--brand-2);letter-spacing:-.02em;line-height:1.15;margin-top:3px}
.res-row{display:flex;justify-content:space-between;gap:10px;padding:9px 2px;font-size:.97rem;border-bottom:1px solid #e2f1f0}.res-row:last-child{border-bottom:0}.res-row b{font-weight:750;text-align:right}
.res-empty{color:var(--muted);text-align:center;padding:26px 0}
.prose{max-width:760px;margin:0 auto;padding:8px 18px}.prose h2{margin-top:1.5em}
.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:13px 0;list-style:none;display:flex;justify-content:space-between}.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--muted)}.faq details[open] summary::after{content:"–"}.faq details p{padding:0 0 13px;margin:0;color:var(--muted)}
.related{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
.related a{background:var(--surface);border:1px solid var(--border);border-radius:11px;padding:13px;font-weight:700;color:var(--text);display:flex;gap:9px;align-items:center}.related a:hover{text-decoration:none;border-color:var(--brand)}
.site-footer{border-top:1px solid var(--border);margin-top:40px;background:var(--surface);padding:24px 0;text-align:center;color:var(--muted);font-size:.88rem}
.foot-links{margin-bottom:10px}.foot-links a{color:var(--muted);font-weight:600}.foot-links a:hover{color:var(--brand)}
.foot-disc{max-width:640px;margin:0 auto 10px;font-size:.82rem;line-height:1.55}
html{scroll-behavior:smooth}.cat-title{scroll-margin-top:80px}
.prose h1{font-size:clamp(1.5rem,4vw,2rem);margin-bottom:.4em}.prose h2{margin-top:1.4em}
/* TikTok username tool */
.panel-h{font-size:1.15rem;margin:0 0 16px}
.tt-lookup{text-align:center;max-width:560px;margin:0 auto}
.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(--brand);box-shadow:0 0 0 3px var(--ring);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}
.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(--brand)}
.loading,.notice{max-width:560px;margin:16px auto 0;text-align:center;color:var(--muted)}
.notice{background:#fff8e6;border:1px solid #f6e6b8;border-radius:12px;padding:14px 16px;color:#7a5c00}
.spinner{display:inline-block;width:15px;height:15px;border:2px solid var(--border);border-top-color:var(--brand);border-radius:50%;vertical-align:-2px;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.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:var(--brand);color:#fff;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}
.res-note{font-size:.82rem;color:var(--muted);margin:14px 0 0;line-height:1.5}
.calc-grid{display:grid;grid-template-columns:1fr;gap:18px}@media(min-width:780px){.calc-grid{grid-template-columns:1fr 1fr}}
.table-wrap{overflow-x:auto;margin:1em 0}
.prose table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:360px}
.prose th,.prose td{border:1px solid var(--border);padding:9px 11px;text-align:left}.prose th{background:var(--surface-2);font-weight:700}
.card .ic{color:var(--brand)}.card .ic svg{width:26px;height:26px}
.ic-sm{display:inline-grid;place-items:center;color:var(--brand)}.ic-sm svg{width:20px;height:20px}