@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');
:root{--bg:#f7f9fc;--surface:#fff;--surface2:#f0f4ff;--text:#172033;--muted:#667085;--line:#e5eaf2;--primary:#2563eb;--primary2:#7c3aed;--accent:#06b6d4;--success:#16a34a;--danger:#dc2626;--shadow:0 18px 50px rgba(30,50,90,.10);--radius:20px}
[data-theme="dark"]{--bg:#0b1220;--surface:#111a2b;--surface2:#17233a;--text:#edf4ff;--muted:#a8b4c8;--line:#26334a;--shadow:0 18px 50px rgba(0,0,0,.28)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Arial,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input{font:inherit}.container{width:min(1180px,calc(100% - 36px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{height:76px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:11px;font-family:"Plus Jakarta Sans";font-weight:800;letter-spacing:-.03em;white-space:nowrap}.brand img{width:40px;height:40px;border-radius:11px}.nav-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.btn,.icon-btn{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:12px;padding:11px 15px;cursor:pointer;font-weight:700;transition:.2s}.btn:hover,.icon-btn:hover{transform:translateY(-1px);border-color:#9ab4ed}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;border:0}.icon-btn{width:44px;height:44px;padding:0;display:grid;place-items:center}.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.menu-btn{display:none}
.hero{padding:72px 0 38px;background:radial-gradient(circle at 90% 10%,#dbeafe 0,transparent 35%),radial-gradient(circle at 10% 20%,#ede9fe 0,transparent 30%)}
[data-theme="dark"] .hero{background:radial-gradient(circle at 90% 10%,#182c56 0,transparent 35%),radial-gradient(circle at 10% 20%,#302052 0,transparent 30%)}
.hero-grid{display:grid;grid-template-columns:1fr 500px;gap:50px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;color:var(--primary);font-weight:800;font-size:12px;letter-spacing:.14em;text-transform:uppercase}.hero h1{font:800 clamp(42px,6vw,72px)/1.02 "Plus Jakarta Sans";letter-spacing:-.055em;margin:15px 0}.hero h1 span{background:linear-gradient(135deg,var(--primary),var(--primary2));color:transparent;background-clip:text}.hero p{font-size:18px;color:var(--muted);max-width:650px}.calculator-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:26px;padding:28px}.card-head{display:flex;justify-content:space-between;gap:15px;align-items:start;margin-bottom:22px}.card-head h2{margin:0;font:800 24px "Plus Jakarta Sans"}.formula{color:var(--muted);font-size:13px;margin-top:4px}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.field label{display:block;font-size:13px;font-weight:800;margin-bottom:7px}.input{width:100%;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);outline:none}.input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(37,99,235,.12)}.actions{display:flex;gap:10px;margin-top:17px;flex-wrap:wrap}.result{margin-top:18px;padding:18px;border-radius:16px;background:linear-gradient(135deg,var(--surface2),rgba(6,182,212,.08));border:1px solid var(--line);min-height:74px}.result strong{font-size:26px;color:var(--primary)}.error{color:var(--danger);font-weight:700}
.section{padding:64px 0}.section-title{text-align:center;max-width:720px;margin:0 auto 28px}.section-title h2{font:800 34px "Plus Jakarta Sans";letter-spacing:-.035em;margin:0 0 8px}.section-title p{color:var(--muted)}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:19px;transition:.2s;position:relative;overflow:hidden}.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#b7c8ed}.tool-icon{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,#dbeafe,#ede9fe);color:var(--primary);margin-bottom:13px}.tool-card h3{font-size:15px;margin:0 0 5px}.tool-card p{margin:0;color:var(--muted);font-size:13px}
.content{max-width:850px;margin:auto}.content h2{font:800 30px "Plus Jakarta Sans";margin-top:38px}.content h3{font-size:20px;margin-top:28px}.content p,.content li{color:var(--muted)}
.faq{max-width:850px;margin:auto}.faq-item{border:1px solid var(--line);border-radius:14px;background:var(--surface);margin:10px 0;overflow:hidden}.faq-q{width:100%;border:0;background:none;color:var(--text);padding:17px 18px;text-align:left;font-weight:800;cursor:pointer;display:flex;justify-content:space-between}.faq-a{display:none;padding:0 18px 18px;color:var(--muted)}.faq-item.open .faq-a{display:block}
.breadcrumb{padding:22px 0;color:var(--muted);font-size:13px}.tool-hero{padding:20px 0 50px}.tool-hero h1{font:800 46px "Plus Jakarta Sans";letter-spacing:-.045em;margin:10px 0}.tool-hero>p{color:var(--muted);max-width:750px}.tool-layout{display:grid;grid-template-columns:minmax(0,760px) 1fr;gap:28px;align-items:start}.side-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px;position:sticky;top:95px}.side-card h3{margin-top:0}.side-card a{display:block;padding:9px 0;color:var(--muted);font-size:14px}.side-card a:hover{color:var(--primary)}
.footer{border-top:1px solid var(--line);margin-top:70px;padding:45px 0;background:var(--surface)}.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:35px}.footer h3{font-size:14px}.footer a,.footer p{display:block;color:var(--muted);font-size:13px;margin:7px 0}.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:20px;color:var(--muted);font-size:12px}
.mega{position:absolute;top:75px;left:50%;transform:translateX(-50%);width:min(1050px,calc(100vw - 30px));background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;padding:25px;display:none}.mega.open{display:block}.mega-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:25px}.mega h4{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--primary);margin:0 0 10px}.mega a{display:block;font-size:13px;color:var(--muted);padding:5px 0}.mega a:hover{color:var(--primary)}
@media(max-width:900px){.hero-grid,.tool-layout{grid-template-columns:1fr}.tool-grid{grid-template-columns:repeat(2,1fr)}.mega-grid{grid-template-columns:repeat(2,1fr)}.side-card{position:static}.footer-grid{grid-template-columns:1fr 1fr}.menu-btn{display:grid}.all-tools{display:none}}
@media(max-width:600px){.container{width:min(100% - 24px,1180px)}.nav{height:66px}.brand span{font-size:14px}.hero{padding:45px 0 25px}.hero h1{font-size:44px}.calculator-card{padding:20px}.field-grid{grid-template-columns:1fr}.tool-grid{grid-template-columns:1fr}.mega{top:65px}.mega-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.tool-hero h1{font-size:36px}}