:root{--bg:#fff;--surface:#fafafa;--bg-muted:#f3f4f6;--text:#111827;--muted:#6b7280;--border:#e5e7eb;--accent:#2563eb}@media (prefers-color-scheme:dark){:root{--bg:#0b0f19;--surface:#111827;--bg-muted:#020617;--text:#e5e7eb;--muted:#9ca3af;--border:#1f2937;--accent:#60a5fa}}*{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){html{--lightningcss-light: ;--lightningcss-dark:initial}}body{background-color:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}h1{margin-bottom:.75rem;font-size:clamp(1.8rem,4vw,2.4rem);line-height:1.2}h2{margin-top:2rem;margin-bottom:.5rem;font-size:clamp(1.2rem,3vw,1.5rem)}p{max-width:70ch;color:var(--text);margin-bottom:1rem}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}.container{max-width:1100px;margin:0 auto;padding:clamp(1rem,4vw,2rem)}.navbar{background:var(--bg);border-bottom:1px solid var(--border);z-index:10;position:sticky;top:0}.nav-inner{justify-content:space-between;align-items:center;max-width:1100px;margin:0 auto;padding:.75rem 1rem;display:flex}.logo{font-size:1.2rem;font-weight:700}.nav-links{gap:1rem;display:flex}.nav-links a{color:var(--muted);font-size:.95rem}.mobile-breadcrumbs{background:var(--bg-muted);padding:.5rem 1rem;display:none}@media (max-width:768px){.nav-links{display:none}.mobile-breadcrumbs{display:block}}.subtitle{color:var(--muted);max-width:60ch}.tool-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:2rem;display:grid}.tool-card{border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:1.25rem;transition:transform .15s,box-shadow .15s}.tool-card:hover{transform:translateY(-2px);box-shadow:0 6px 16px #0000000f}.footer{border-top:1px solid var(--border);text-align:center;color:var(--muted);margin-top:4rem;padding:2rem 1rem;font-size:.9rem}.footer nav{margin-bottom:.75rem}.footer a{margin:0 .4rem}.tool,.tool-container{max-width:900px;margin:0 auto}.tool-header{margin-bottom:1.5rem}.tool-desc{color:var(--muted)}.tool-textarea,textarea{border:1px solid var(--border);background:var(--surface);width:100%;min-height:180px;color:var(--text);resize:vertical;border-radius:8px;padding:1rem;font-size:1rem}.tool-input{border:1px solid var(--border);background:var(--surface);width:100%;color:var(--text);border-radius:8px;margin-bottom:1rem;padding:.75rem}textarea:focus,.tool-textarea:focus,.tool-input:focus{border-color:var(--accent);outline:none}.tool-actions{flex-wrap:wrap;gap:.5rem;margin-top:1rem;display:flex}.tool-actions button{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:6px;padding:.5rem .9rem}.tool-actions button:hover{background:var(--bg-muted)}.tool-stats,.tool-result{margin-top:1rem;font-weight:500}@media (max-width:640px){.tool,.tool-container{padding:0 .5rem}}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;margin-top:1.25rem;display:grid}.stat-card{background:var(--bg-muted);text-align:center;border-radius:12px;padding:1rem}.stat-value{font-size:1.5rem;font-weight:600;display:block}.stat-label{color:var(--muted);font-size:.85rem}.breadcrumbs{color:var(--muted);flex-wrap:wrap;gap:.4rem;font-size:.85rem;display:flex}.breadcrumbs li{align-items:center;list-style:none;display:flex}.breadcrumbs li:after{content:"/";color:var(--muted);margin:0 .4rem}.breadcrumbs li:last-child:after{content:""}.breadcrumbs a{color:var(--muted)}.breadcrumbs a:hover{color:var(--accent)}.calculator{background:#0f172a;border-radius:20px;width:340px;margin:2rem auto;padding:1rem;box-shadow:0 20px 50px #0009}.calculator-display{color:#fff;background:#020617;border-radius:14px;flex-direction:column;justify-content:center;align-items:flex-end;min-height:90px;padding:1rem;display:flex;overflow:hidden}.calculator-display::-webkit-scrollbar{display:none}.calculator-expression{color:#94a3b8;text-align:right;background:0 0;border:none;outline:none;width:100%;font-size:1.1rem}.calculator-result{text-align:right;color:#fff;width:100%;font-size:1.8rem;font-weight:700}.calculator-keypad{grid-template-columns:repeat(4,1fr);gap:.75rem;display:grid}.btn{color:#fff;cursor:pointer;background:#020617;border:none;border-radius:14px;height:56px;font-size:1.1rem;font-weight:500;transition:transform 50ms,background .15s}.btn:hover{filter:brightness(1.2);background:#020617}.btn:active{transform:scale(.96)}.btn-operator{background:#1e293b;font-weight:600}.btn-clear{background:#dc2626;font-weight:600}.btn-equals{background:#16a34a;font-weight:700}.btn-equals-full{grid-column:span 4;height:60px;font-size:1.4rem;font-weight:700}.btn-equals-tall{grid-row:span 2}.btn-zero{grid-column:span 2}@media (max-width:420px){.calculator{width:100%}.calculator-layout{flex-direction:column;align-items:center}.calculator-history{width:100%;margin-top:1.5rem}}.calculator-layout{justify-content:center;align-items:flex-start;gap:2rem;margin-top:2rem;display:flex}.calculator-history{color:#fff;background:#0f172a;border-radius:20px;width:260px;padding:1rem;box-shadow:0 20px 50px #0009}.calculator-history h2{color:#94a3b8;margin-bottom:.75rem;font-size:1rem;font-weight:600}.calculator-history ul{margin:0;padding:0;list-style:none}.calculator-history li{cursor:pointer;border-bottom:1px solid #1e293b;padding:.4rem 0;font-size:.9rem;transition:color .2s}.calculator-history li:hover{color:#38bdf8}.calculator-help{align-items:center;display:flex;position:relative}.help-icon{color:#fff;cursor:pointer;background:#1e293b;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;font-size:.9rem;font-weight:600;transition:background .2s;display:inline-flex}.help-icon:hover{background:#334155}.help-tooltip{color:#e2e8f0;opacity:0;visibility:hidden;z-index:100;background:#0f172a;border-radius:12px;width:260px;padding:.8rem;font-size:.85rem;transition:opacity .2s,transform .2s;position:absolute;top:36px;left:0;transform:translateY(5px);box-shadow:0 10px 30px #0006}.help-tooltip ul{margin:.5rem 0 0;padding-left:1rem}.calculator-help:hover .help-tooltip{opacity:1;visibility:visible;transform:translateY(0)}.scientific-calculator .calculator{width:460px}.scientific-calculator .sci-grid{grid-template-columns:repeat(5,1fr);gap:.75rem;margin-top:1rem;display:grid}.scientific-calculator .btn{height:54px;font-size:1rem}.scientific-calculator .btn-zero{grid-column:span 2}.scientific-calculator .btn-equals-full{grid-column:span 5;height:60px;font-size:1.3rem}@media (max-width:480px){.scientific-calculator .calculator{width:100%}.scientific-calculator .sci-grid{grid-template-columns:repeat(4,1fr)}.scientific-calculator .btn-equals-full{grid-column:span 4}}
