:root{
  --bg:#f8fafc;
  --surface:#ffffff;
  --surface-2:#f1f5f9;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --accent:#2563eb;
  --accent-2:#1d4ed8;
  --accent-soft:#eff6ff;
  --shadow:0 8px 28px rgba(15,23,42,.06);
  --shadow-lg:0 18px 50px rgba(15,23,42,.14);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}
a{text-decoration:none;color:inherit}
button,input,select{font:inherit}
button{cursor:pointer}
.container{width:min(1160px,calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,232,240,.85)}
.header-inner{height:72px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.03em}
.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--accent);display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:4px;padding:7px;box-shadow:0 5px 15px rgba(37,99,235,.25)}
.brand-mark span{background:white;border-radius:3px;opacity:.97}
.brand-text{font-size:20px}.brand-text span{color:var(--accent)}
.top-nav{display:flex;gap:30px;color:#475569;font-size:14px;font-weight:600}.top-nav a:hover{color:var(--accent)}
.header-actions{display:flex;gap:8px}.icon-btn,.menu-btn{border:0;background:transparent;width:40px;height:40px;border-radius:12px;color:#475569}.icon-btn:hover,.menu-btn:hover{background:var(--surface-2);color:var(--text)}.menu-btn{display:none;font-size:20px}
.mobile-nav{display:none;border-top:1px solid var(--line);padding:10px 20px}.mobile-nav a{display:block;padding:10px 0;font-weight:600;color:#475569}
.hero{padding:58px 0 20px;text-align:center}.hero-copy{max-width:760px;margin:auto}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--accent-soft);color:var(--accent-2);font-size:12px;font-weight:700;padding:7px 11px;border-radius:999px;margin-bottom:14px}.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}
.hero h1{font-size:clamp(32px,5vw,52px);line-height:1.08;letter-spacing:-.05em;margin:0 0 12px}.hero p{margin:0;color:var(--muted);font-size:18px}
.search-box{width:min(760px,100%);height:60px;background:var(--surface);border:1px solid #dbe4ee;border-radius:999px;margin:28px auto 12px;display:flex;align-items:center;box-shadow:0 8px 30px rgba(15,23,42,.08);transition:.2s}.search-box:focus-within{border-color:#93c5fd;box-shadow:0 0 0 5px rgba(37,99,235,.09),0 10px 30px rgba(15,23,42,.08)}
.search-icon{font-size:28px;color:#94a3b8;line-height:1;margin:0 10px 2px 21px}.search-box input{flex:1;border:0;outline:0;min-width:0;background:transparent;color:var(--text);font-size:16px}.search-box input::placeholder{color:#94a3b8}.search-clear{width:44px;height:44px;border:0;border-radius:50%;background:transparent;color:#94a3b8;font-size:25px;display:none}.search-clear.visible{display:block}.search-hints{display:flex;justify-content:center;flex-wrap:wrap;gap:8px}.search-hints button{border:1px solid var(--line);background:var(--surface);color:#475569;border-radius:999px;padding:6px 11px;font-size:12px}.search-hints button:hover{border-color:#bfdbfe;color:var(--accent);background:var(--accent-soft)}
.ad-slot{background:transparent;color:#a0aec0;min-height:90px;border:1px dashed #dce4ee;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:10px;letter-spacing:.12em;text-transform:uppercase}.ad-slot span{padding:7px 10px;background:rgba(255,255,255,.8);border-radius:6px}.ad-top{min-height:100px;margin:25px auto 34px}.ad-sidebar{min-height:250px;margin-bottom:20px}.ad-bottom{margin:28px auto 0;min-height:120px}.in-content-ad{margin:32px 0;min-height:120px}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}.main-column{min-width:0}.sidebar{position:sticky;top:92px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:16px}.section-kicker{text-transform:uppercase;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.14em;display:block;margin-bottom:5px}.section-heading h2{font-size:24px;letter-spacing:-.03em;margin:0}.results-count{font-size:13px;color:var(--muted)}
.category-tabs{display:flex;gap:6px;margin-bottom:16px}.category-tab{border:0;background:transparent;color:#64748b;font-size:13px;font-weight:700;padding:8px 12px;border-radius:10px}.category-tab:hover{background:var(--surface-2)}.category-tab.active{background:var(--text);color:white}
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;min-height:178px;display:flex;flex-direction:column;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;box-shadow:0 2px 10px rgba(15,23,42,.02)}.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cbd5e1}.tool-icon{width:42px;height:42px;border-radius:13px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:20px;margin-bottom:14px}.tool-card h3{font-size:15px;margin:0 0 5px;letter-spacing:-.01em}.tool-card p{font-size:12px;color:var(--muted);margin:0;line-height:1.45}.tool-card .open-tool{margin-top:auto;padding-top:14px;font-size:12px;font-weight:800;color:var(--accent);display:inline-flex;align-items:center;gap:5px}.tool-card .open-tool::after{content:'→';transition:transform .15s}.tool-card:hover .open-tool::after{transform:translateX(3px)}
.empty-state{text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:42px 20px}.empty-icon{font-size:32px;color:#94a3b8}.empty-state h3{margin:10px 0 4px}.empty-state p{color:var(--muted);margin:0;font-size:13px}.hidden{display:none!important}
.side-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:20px;box-shadow:0 2px 10px rgba(15,23,42,.02)}.side-card-title{font-weight:800;font-size:15px;margin-bottom:12px}.side-row{display:flex;gap:11px;padding:11px 0;border-top:1px solid #eef2f7}.side-icon{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;background:var(--surface-2);font-size:14px;flex:0 0 auto}.side-row strong{display:block;font-size:12px}.side-row small{display:block;color:var(--muted);font-size:11px;line-height:1.35;margin-top:2px}
.popular-section{margin-top:4px}.popular-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.popular-item{border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:12px 13px;display:flex;align-items:center;gap:10px;cursor:pointer}.popular-item:hover{border-color:#bfdbfe;background:#fbfdff}.popular-item .mini-icon{width:32px;height:32px;border-radius:10px;background:var(--accent-soft);display:grid;place-items:center;color:var(--accent);font-size:15px;flex:0 0 auto}.popular-item strong{font-size:12px;display:block}.popular-item small{color:var(--muted);font-size:10px}
.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:54px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden}.trust-strip>div{background:var(--surface);padding:20px 24px;display:flex;align-items:center;gap:12px}.trust-number{font-size:25px;font-weight:800;letter-spacing:-.04em}.trust-strip strong{display:block;font-size:12px}.trust-strip small{display:block;color:var(--muted);font-size:10px;margin-top:2px}.seo-copy{padding:56px 0 20px;max-width:900px}.seo-copy h2{font-size:24px;letter-spacing:-.03em;margin:0 0 12px}.seo-copy p{color:#64748b;font-size:14px;margin:0 0 12px}
.site-footer{margin-top:50px;background:#0f172a;color:#cbd5e1}.footer-inner{padding:38px 0;display:flex;justify-content:space-between;gap:30px}.footer-brand .brand-text{color:white}.footer-brand .brand-text span{color:#60a5fa}.footer-brand p{max-width:360px;color:#94a3b8;font-size:12px;margin:10px 0 0}.footer-links{display:flex;gap:22px;font-size:12px;font-weight:600}.footer-links a:hover{color:white}.footer-bottom{border-top:1px solid rgba(148,163,184,.16);padding:15px 0 20px;color:#64748b;font-size:10px;display:flex;justify-content:space-between}
.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.52);backdrop-filter:blur(4px);z-index:50;padding:20px;overflow:auto}.tool-modal{width:min(700px,100%);margin:6vh auto;background:var(--surface);border-radius:22px;box-shadow:var(--shadow-lg);overflow:hidden}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:22px 24px;border-bottom:1px solid var(--line)}.modal-header h2{margin:0;font-size:22px;letter-spacing:-.03em}.close-btn{border:0;background:var(--surface-2);width:38px;height:38px;border-radius:11px;font-size:25px;color:#64748b}.close-btn:hover{color:var(--text)}.modal-body{padding:24px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.field{display:flex;flex-direction:column;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:12px;font-weight:700;color:#475569}.field input,.field select{width:100%;height:44px;border:1px solid #cbd5e1;border-radius:11px;padding:0 12px;background:var(--surface);color:var(--text);outline:0}.field input:focus,.field select:focus{border-color:#60a5fa;box-shadow:0 0 0 4px rgba(37,99,235,.08)}.tool-actions{display:flex;gap:10px;margin-top:18px}.primary-btn,.secondary-btn{height:44px;padding:0 16px;border-radius:11px;font-weight:800;border:1px solid var(--line)}.primary-btn{background:var(--accent);color:white;border-color:var(--accent)}.primary-btn:hover{background:var(--accent-2)}.secondary-btn{background:var(--surface);color:#475569}.secondary-btn:hover{background:var(--surface-2)}.result-box{margin-top:18px;background:var(--accent-soft);border:1px solid #dbeafe;border-radius:15px;padding:18px}.result-label{font-size:11px;color:#64748b;text-transform:uppercase;letter-spacing:.11em;font-weight:800}.result-value{font-size:30px;font-weight:800;letter-spacing:-.04em;margin-top:4px;color:#0f3f9f;word-break:break-word}.result-note{font-size:12px;color:#64748b;margin-top:6px}.calculator-shell{display:grid;grid-template-columns:1fr 1fr;gap:18px}.calc-display{background:#0f172a;border-radius:16px;padding:18px;color:white}.calc-expression{height:28px;color:#94a3b8;font-size:13px;word-break:break-all}.calc-value{font-size:34px;font-weight:800;text-align:right;letter-spacing:-.04em;margin-top:8px;min-height:45px;word-break:break-all}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.keypad button{height:48px;border:1px solid var(--line);background:var(--surface-2);border-radius:10px;font-weight:800;color:var(--text)}.keypad button:hover{filter:brightness(.97)}.keypad .op{color:var(--accent);background:var(--accent-soft);border-color:#dbeafe}.keypad .equals{background:var(--accent);color:white;border-color:var(--accent)}
.dark{--bg:#0b1120;--surface:#111827;--surface-2:#1f2937;--text:#f8fafc;--muted:#94a3b8;--line:#263244;--accent-soft:#172554;--shadow:0 8px 28px rgba(0,0,0,.24);--shadow-lg:0 18px 55px rgba(0,0,0,.4)}.dark .site-header{background:rgba(17,24,39,.92);border-color:#263244}.dark .tool-card,.dark .side-card,.dark .popular-item,.dark .search-box,.dark .empty-state,.dark .trust-strip>div{box-shadow:none}.dark .search-box{border-color:#334155}.dark .search-hints button{background:#111827}.dark .ad-slot span{background:#111827}.dark .site-footer{background:#020617}.dark .field input,.dark .field select{border-color:#334155}.dark .result-value{color:#bfdbfe}
@media(max-width:1020px){.content-grid{grid-template-columns:1fr}.sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:18px}.ad-sidebar{min-height:180px;margin:0}.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.popular-list{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.container{width:min(100% - 28px,1160px)}.top-nav{display:none}.menu-btn{display:block}.mobile-nav.open{display:block}.hero{padding-top:42px}.hero h1{font-size:38px}.hero p{font-size:16px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.trust-strip{grid-template-columns:1fr}.trust-strip>div{padding:16px 18px}.sidebar{grid-template-columns:1fr}.footer-inner,.footer-bottom{flex-direction:column}.footer-links{flex-wrap:wrap}.calculator-shell{grid-template-columns:1fr}}
@media(max-width:520px){.container{width:calc(100% - 24px)}.hero h1{font-size:32px}.search-box{height:56px}.search-icon{margin-left:16px}.tool-grid{grid-template-columns:1fr}.popular-list{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.modal-body{padding:18px}.modal-header{padding:18px}.ad-top{margin-bottom:22px}.seo-copy{padding-top:38px}}