*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#fff;--bg2:#f7f8fa;--bg3:#eef0f4;
  --text:#0f1117;--text2:#4a5060;--text3:#8a909f;
  --border:#e2e5ec;--accent:#2563eb;--adark:#1d4ed8;--abg:#eff4ff;--ibg:#f7f8fa;
  --r:10px;--rs:6px;
  --nav-w:72px;--bot-h:64px;
}
.dark{
  --bg:#0f1117;--bg2:#161b27;--bg3:#1e2535;
  --text:#f0f2f7;--text2:#9aa3b5;--text3:#5a6070;
  --border:#252d40;--accent:#3b82f6;--adark:#1e3a5f;--abg:#1a2540;--ibg:#1e2535;
}
body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:15px;line-height:1.5;transition:background .2s,color .2s}

/* ── LAYOUT ── */
.app{display:flex;min-height:100vh}

/* Desktop side nav */
.sidenav{
  width:var(--nav-w);flex-shrink:0;
  background:var(--bg2);border-right:1px solid var(--border);
  display:flex;flex-direction:column;align-items:center;
  padding:12px 0 20px;position:fixed;top:0;left:0;bottom:0;z-index:200;
  transition:background .2s;
}
.sidenav-logo{font-size:11px;font-weight:700;color:var(--accent);text-align:center;padding:0 4px 12px;border-bottom:1px solid var(--border);width:100%;margin-bottom:8px;letter-spacing:-.3px;line-height:1.3}
.sidenav-logo span{color:var(--text);font-weight:400}
.nav-item{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  width:60px;height:56px;border-radius:var(--rs);cursor:pointer;
  transition:background .15s,color .15s;margin:1px 0;
  color:var(--text3);gap:3px;border:none;background:transparent;
}
.nav-item:hover{background:var(--bg3);color:var(--text)}
.nav-item.active{background:var(--abg);color:var(--accent)}
.nav-item svg{width:20px;height:20px;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.nav-item span{font-size:9px;font-weight:500;text-align:center;line-height:1.2;max-width:58px}
.sidenav-spacer{flex:1}
.sidenav-bottom{display:flex;flex-direction:column;align-items:center;gap:4px;width:100%}
.theme-tog-wrap{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 0;cursor:pointer}
.theme-tog-wrap span{font-size:9px;color:var(--text3);font-weight:500}
.tog{width:36px;height:20px;border-radius:10px;background:var(--bg3);border:0.5px solid var(--border);cursor:pointer;position:relative;transition:background .2s}
.tog.on{background:var(--accent)}
.tog::after{content:'';position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:left .2s;box-shadow:0 1px 3px rgba(0,0,0,.15)}
.tog.on::after{left:18px}

/* Main content area */
.main{margin-left:var(--nav-w);flex:1;min-width:0}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--bg);z-index:100}
.topbar-left{display:flex;align-items:center;gap:10px}
.back-btn{display:none;align-items:center;gap:6px;font-size:13px;color:var(--accent);cursor:pointer;border:none;background:transparent;font-family:inherit;padding:0}
.back-btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.back-btn.visible{display:flex}
.topbar-title{font-size:15px;font-weight:500;color:var(--text)}
.geo-badge{font-size:11px;color:var(--text3);background:var(--bg3);padding:3px 10px;border-radius:20px;border:0.5px solid var(--border);white-space:nowrap}

/* Pages */
.page{display:none;padding:28px 24px 40px}
.page.active{display:block}

/* Homepage grid */
.home-hero{margin-bottom:28px}
.home-hero h1{font-size:22px;font-weight:600;color:var(--text);margin-bottom:6px}
.home-hero p{font-size:14px;color:var(--text2);max-width:520px;line-height:1.6}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.tool-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);
  padding:18px 16px;cursor:pointer;transition:all .15s;
  display:flex;flex-direction:column;gap:10px;
}
.tool-card:hover{border-color:var(--accent);background:var(--abg);transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.08)}
.tool-card-icon{width:40px;height:40px;border-radius:var(--rs);background:var(--abg);display:flex;align-items:center;justify-content:center;color:var(--accent)}
.tool-card-icon svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tool-card h2{font-size:14px;font-weight:500;color:var(--text);margin:0}
.tool-card p{font-size:12px;color:var(--text2);line-height:1.5;margin:0}

/* Tool content styles */
.ttl{font-size:17px;font-weight:500;margin-bottom:4px;color:var(--text)}
.seo-intro{background:var(--bg2);border-radius:var(--rs);padding:12px 16px;margin-bottom:20px;border:0.5px solid var(--border)}
.seo-intro p{font-size:13px;color:var(--text2);margin-bottom:6px}
.seo-intro ul{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0}
.seo-intro ul li{font-size:12px;color:var(--text3);background:var(--bg3);border-radius:20px;padding:2px 10px;border:0.5px solid var(--border)}
.seo-footer{margin-top:28px;padding-top:20px;border-top:1px solid var(--border)}
.seo-footer h3{font-size:14px;font-weight:500;color:var(--text);margin-bottom:8px}
.seo-footer p{font-size:13px;color:var(--text2);line-height:1.7;margin-bottom:12px}
.faq-item{margin-bottom:12px}
.faq-q{font-size:13px;font-weight:500;color:var(--text);margin-bottom:3px}
.faq-a{font-size:13px;color:var(--text2);line-height:1.6}
.disclaimer{font-size:12px;color:var(--text3);background:var(--bg3);border-radius:var(--rs);padding:10px 14px;margin-top:12px;border:0.5px solid var(--border)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.fld{display:flex;flex-direction:column;gap:6px}
label{font-size:13px;color:var(--text2);font-weight:500}
input[type=number],input[type=text],select,textarea{width:100%;padding:10px 12px;border-radius:var(--rs);border:1px solid var(--border);background:var(--ibg);color:var(--text);font-size:15px;outline:none;transition:border .15s;font-family:inherit}
input:focus,select:focus{border-color:var(--accent)}
input[type=range]{padding:0}
.brow{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;align-items:center}
.rbox{margin-top:20px;background:var(--abg);border:1px solid var(--accent);border-radius:var(--r);padding:16px 20px}
.rlbl{font-size:12px;color:var(--accent);font-weight:500;margin-bottom:4px;text-transform:uppercase;letter-spacing:.05em}
.rval{font-size:28px;font-weight:600;color:var(--accent)}
.rsub{font-size:13px;color:var(--text2);margin-top:4px}
.rgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-top:12px}
.mc{background:var(--bg3);border-radius:var(--rs);padding:12px;border:0.5px solid var(--border)}
.ml{font-size:11px;color:var(--text3);margin-bottom:2px}
.mv{font-size:16px;font-weight:500;color:var(--text)}
.err{font-size:13px;color:#dc2626;margin-top:10px;display:none}
.bmi-stack{display:flex;flex-direction:column;gap:16px;max-width:500px}
.bfr{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:end}
.dim-legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px}
.dim-leg-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text2)}
.dim-leg-dot{display:inline-block;width:10px;height:10px;border-radius:2px;flex-shrink:0}
.unit-btns{display:flex;margin-top:8px;border:1px solid var(--border);border-radius:var(--rs);overflow:hidden;width:fit-content}
.unit-btn{padding:7px 16px;border:none;border-right:1px solid var(--border);background:var(--bg2);color:var(--text2);font-size:13px;font-weight:500;cursor:pointer;font-family:inherit;transition:background .15s,color .15s}
.unit-btn:last-child{border-right:none}
.unit-btn.active{background:var(--accent);color:#fff}
.unit-btn:hover:not(.active){background:var(--bg3);color:var(--text)}
.ftin{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:6px;align-items:center}
.ftin span{font-size:13px;color:var(--text3);text-align:center}
.bmibar{height:12px;border-radius:6px;background:linear-gradient(to right,#3b82f6 0%,#22c55e 30%,#f59e0b 60%,#ef4444 80%,#dc2626 100%);margin:14px 0 6px;position:relative}
.bmimk{position:absolute;top:-4px;width:4px;height:20px;background:var(--text);border-radius:2px;transform:translateX(-50%);transition:left .4s}
.bmilbl{display:flex;justify-content:space-between;font-size:11px;color:var(--text3)}
.ugrid{display:grid;grid-template-columns:1fr 40px 1fr;gap:10px;align-items:end;margin-bottom:16px}
.ucol{display:flex;flex-direction:column;gap:6px}
.uarr{display:flex;align-items:center;justify-content:center;color:var(--text3);font-size:20px;height:42px}
.ures{background:var(--bg3)!important;color:var(--text)!important;font-weight:500}
.dtrip{display:flex;gap:6px;align-items:center}
.dtrip .sep{font-size:18px;color:var(--text3);font-weight:300;flex-shrink:0}
.agbig{font-size:30px;font-weight:600;color:var(--accent);margin-bottom:6px;line-height:1.2}
.agsub{font-size:14px;color:var(--text2);margin-bottom:16px}
.cdsp{background:var(--bg3);border-radius:var(--rs);padding:14px 16px;text-align:right;font-size:24px;font-weight:500;border:0.5px solid var(--border);min-height:56px;word-break:break-all;color:var(--text)}
.cgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:12px}
.ck{padding:13px 8px;border-radius:var(--rs);border:0.5px solid var(--border);background:var(--bg3);color:var(--text);font-size:15px;font-weight:500;cursor:pointer;transition:all .1s;text-align:center;user-select:none}
.ck:hover{background:var(--border)}
.ck.op{background:var(--bg2);color:var(--accent)}
.ck.eq{background:#2563eb;color:#fff;border-color:#2563eb}
.ck.eq:hover{background:#1d4ed8}
.ck.w2{grid-column:span 2}
.warea{width:100%;min-height:120px;resize:vertical;font-size:14px;line-height:1.6;padding:10px 12px;border-radius:var(--rs);border:1px solid var(--border);background:var(--ibg);color:var(--text);outline:none;font-family:inherit}
.spill{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.sp{background:var(--bg3);border:0.5px solid var(--border);border-radius:20px;padding:5px 14px;font-size:13px;color:var(--text2)}
.sp b{color:var(--text)}
.pwdb{display:flex;align-items:center;gap:12px;font-family:'Courier New',monospace;font-size:15px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--rs);padding:10px 12px 10px 14px;letter-spacing:.04em;color:var(--text);margin-bottom:8px}
.pwdb-text{flex:1;min-width:0;word-break:break-all}
.pwdb-copy{flex-shrink:0;background:none;border:none;cursor:pointer;color:var(--text3);padding:4px;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:color .15s}
.pwdb-copy:hover{color:var(--accent)}
.pwdb-copy.copied{color:#22c55e}
.adsl{background:#f0f0f0;border:1px dashed #b0b8c9;border-radius:var(--rs);text-align:center;padding:18px;font-size:12px;color:#666;margin-top:24px;min-height:60px;display:flex;align-items:center;justify-content:center}
.dark .adsl{background:#000000;border-color:#3a4560;color:#8a909f}
.home-right{display:none}
.home-bottom-ads .adsl+.adsl{display:none}
.legal-body{font-size:14px;color:var(--text2);line-height:1.8}
.legal-body h2{font-size:16px;font-weight:500;color:var(--text);margin:24px 0 8px}
.legal-body h2:first-child{margin-top:0}
.legal-body p{margin-bottom:12px}
.legal-body ul{margin:0 0 12px 20px}
.legal-body ul li{margin-bottom:4px}
.legal-body .updated{font-size:12px;color:var(--text3);margin-bottom:20px}
.legal-body a{color:var(--accent)}

/* Footer */
.site-footer{padding:20px 24px;border-top:1px solid var(--border);display:flex;gap:16px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.ft-links{display:flex;gap:16px;flex-wrap:wrap}
.ft-link{font-size:12px;color:var(--text3);cursor:pointer;text-decoration:underline;text-underline-offset:2px}
.ft-link:hover{color:var(--accent)}
.ft-copy{font-size:12px;color:var(--text3)}

/* Cookie banner */
.cookie-banner{position:fixed;bottom:0;left:0;right:0;background:var(--bg);border-top:1px solid var(--border);padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;z-index:1000;box-shadow:0 -2px 12px rgba(0,0,0,.06)}
.cookie-banner p{font-size:13px;color:var(--text2);flex:1;min-width:200px}
.cookie-banner a{color:var(--accent);cursor:pointer;text-decoration:underline}
.cookie-btns{display:flex;gap:8px;flex-shrink:0}

/* Mobile-only theme toggle (above footer) */
.mob-theme-tog{display:none;align-items:center;justify-content:center;gap:10px;padding:16px 24px;border-top:1px solid var(--border);cursor:pointer}
.mob-theme-tog span{font-size:13px;color:var(--text2);font-weight:500}
@media(max-width:700px){.mob-theme-tog{display:flex}}

/* Mobile bottom nav */
.botnav{display:none;position:fixed;bottom:0;left:0;right:0;height:var(--bot-h);background:var(--bg2);border-top:1px solid var(--border);z-index:200;overflow-x:auto;overflow-y:hidden;scrollbar-width:none}
.botnav::-webkit-scrollbar{display:none}
.botnav-inner{display:flex;align-items:stretch;min-width:max-content;height:100%}
.bot-item{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:62px;padding:0 4px;cursor:pointer;color:var(--text3);gap:3px;border:none;background:transparent;font-family:inherit}
.bot-item.active{color:var(--accent)}
.bot-item svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.bot-item span{font-size:9px;font-weight:500;text-align:center;white-space:nowrap}

/* Responsive */
@media(max-width:700px){
  .sidenav{display:none}
  .main{margin-left:0;padding-bottom:var(--bot-h)}
  .botnav{display:block}
  .tool-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
  .page{padding:20px 16px 32px}
  .topbar{padding:12px 16px}
  .row,.row3{grid-template-columns:1fr}
}
@media(max-width:400px){
  .tool-grid{grid-template-columns:1fr 1fr}
}

/* ── MULTI-PAGE ADDITIONS ── */
.page{display:block}

a.nav-item,a.bot-item{text-decoration:none}

a.back-btn{text-decoration:none}

a.tool-card{text-decoration:none;color:inherit}

/* Dark mode on <html> for flash-of-light prevention */
html.dark{
  --bg:#0f1117;--bg2:#161b27;--bg3:#1e2535;
  --text:#f0f2f7;--text2:#9aa3b5;--text3:#5a6070;
  --border:#252d40;--accent:#3b82f6;--adark:#1e3a5f;--abg:#1a2540;--ibg:#1e2535;
}
html.dark .adsl{background:#252d40;border-color:#3a4560;color:#8a909f}

@media(min-width:1080px) {
  .page:has(> .tool-main) {
    display: flex;
    gap: 48px;
    align-items: flex-start;
    max-width: 1100px;
  }
  .tool-main {
    flex: 0 0 560px;
    min-width: 0;
  }
  .page:has(> .tool-main) > .seo-footer {
    flex: 0 1 400px;
    min-width: 280px;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    border-left: 1px solid var(--border);
    padding-left: 32px;
  }
  .tool-grid {
    grid-template-columns: repeat(3, 200px);
  }
  .home-layout{display:flex;gap:32px;align-items:flex-start}
  .home-left{flex:0 0 624px;min-width:0}
  .home-right{display:block;flex:1;min-width:0}
  .home-right .adsl{margin-top:0}
  .home-bottom-ads{display:flex;gap:32px;margin-top:28px}
  .home-bottom-ads .adsl{flex:0 0 624px;min-width:0;margin-top:0}
  .home-bottom-ads .adsl+.adsl{display:flex;flex:1}
}