:root{--bg:#080b0d;--panel:#101519;--panel2:#141a1f;--line:#273038;--text:#f3f6f7;--muted:#aab4bc;--accent:#d7ff3f;--accent2:#ff9f43;--max:1180px;--radius:18px;--shadow:0 18px 50px rgba(0,0,0,.28)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 10% -10%,#18221e 0,#080b0d 35%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}img{max-width:100%;display:block}.container{width:min(var(--max),calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(8,11,13,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav{min-height:72px;display:flex;align-items:center;gap:24px;position:relative}.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.02em}.brand-mark{width:36px;height:36px;border-radius:10px;background:var(--accent);color:#0b0f12;display:grid;place-items:center;font-size:.76rem;font-weight:950}.nav-links{display:flex;gap:17px;margin-left:auto;align-items:center}.nav-links a{font-size:.9rem;color:#cbd3d8}.menu-btn{display:none;margin-left:auto;background:#151b20;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:9px 12px}.hero{padding:74px 0 42px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}.eyebrow{display:inline-block;text-transform:uppercase;letter-spacing:.13em;font-size:.73rem;font-weight:900;color:var(--accent2);margin-bottom:12px}h1,h2,h3{line-height:1.12;letter-spacing:-.035em;margin:0 0 14px}h1{font-size:clamp(2.45rem,6vw,5.4rem)}h2{font-size:clamp(1.8rem,3.3vw,2.8rem)}h3{font-size:1.12rem}.lead{font-size:1.12rem;color:#c6cfd5;max-width:760px}.hero-photo{border:1px solid var(--line);border-radius:26px;overflow:hidden;background:#11171b;box-shadow:var(--shadow);aspect-ratio:4/3}.hero-photo img{width:100%;height:100%;object-fit:cover}.section{padding:54px 0}.section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:24px}.section-head p{max-width:700px;color:var(--muted);margin:0}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#0a0e10;font-weight:950;padding:12px 17px;border-radius:12px;border:0;cursor:pointer}.btn:hover{color:#0a0e10;filter:brightness(1.04)}.btn.secondary{background:#1a2228;color:var(--text);border:1px solid var(--line)}.internal-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:20px}.pill{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:#11171b;color:#cfd7dc;font-size:.9rem}.pill:hover{border-color:var(--accent)}.calculator{background:linear-gradient(145deg,#151c21,#0e1317);border:1px solid #303b43;border-radius:22px;padding:24px;box-shadow:var(--shadow)}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.field label{display:block;font-weight:800;margin-bottom:7px}.field small{display:block;color:#85919a;margin-top:5px}input,select,button{font:inherit}input,select{width:100%;background:#0a0e11;color:var(--text);border:1px solid #37424b;border-radius:12px;padding:13px 14px;outline:none}input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(215,255,63,.09)}.unit-row{display:flex;gap:8px;margin-top:10px;max-width:330px}.unit-row button{flex:1;border:1px solid var(--line);background:#171e23;color:#cbd3d8;padding:9px;border-radius:10px;cursor:pointer}.unit-row button.active{background:var(--accent);color:#0b0e10;border-color:var(--accent);font-weight:950}.calc-actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}.calc-output{margin-top:20px}.results{display:grid;grid-template-columns:1.05fr .95fr;gap:16px}.result-main{background:#0a0f12;border:1px solid #34404a;border-radius:17px;padding:22px}.result-number{font-size:clamp(2.6rem,6vw,4.5rem);font-weight:950;letter-spacing:-.065em;color:var(--accent);line-height:1}.muted{color:var(--muted)}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:.2s transform,.2s border-color}.card:hover{transform:translateY(-2px);border-color:#4a5963}.tool-card{display:flex;gap:14px;align-items:flex-start}.tool-icon{width:50px;height:50px;flex:0 0 50px;border-radius:14px;background:#1c252b;display:grid;place-items:center;color:var(--accent);font-weight:950}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{background:#11171b;border:1px solid var(--line);border-radius:15px;padding:17px}.stat strong{display:block;font-size:1.55rem}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:15px}table{width:100%;border-collapse:collapse;min-width:520px}th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}th{background:#171e23}tr:last-child td{border-bottom:0}.note{border-left:3px solid var(--accent);padding:13px 16px;background:#141b1f;color:#cbd3d8;border-radius:0 12px 12px 0}.warning{border-left-color:var(--accent2)}.prose{max-width:100%;min-width:0}.prose p,.prose li{color:#c3ccd2}.prose ul,.prose ol{padding-left:22px}.prose blockquote{margin:18px 0;padding:14px 18px;border-left:3px solid var(--accent2);background:#12181c;color:#dbe1e5}.exercise-photo{border-radius:18px;overflow:hidden;border:1px solid var(--line);aspect-ratio:16/9;background:#11171b}.exercise-photo img{width:100%;height:100%;object-fit:cover}.breadcrumb{font-size:.85rem;color:#8d98a0;padding-top:22px}.breadcrumb a{color:#bac4ca}.meta-strip{display:flex;gap:9px;flex-wrap:wrap;margin:14px 0 20px}.badge{display:inline-flex;align-items:center;gap:6px;border:1px solid #34404a;border-radius:999px;padding:5px 9px;color:#b9c4ca;font-size:.78rem}.faq details{border:1px solid var(--line);border-radius:13px;padding:14px 16px;background:#11171b;margin:9px 0}.faq summary{cursor:pointer;font-weight:850}.site-footer{border-top:1px solid var(--line);margin-top:50px;padding:46px 0 26px;background:#06090b}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(4,1fr);gap:28px;align-items:start}.site-footer h3{font-size:.92rem}.site-footer a,.site-footer p{display:block;color:#9ca8b0;font-size:.88rem;margin:7px 0}.site-footer .footer-legal{display:flex;align-items:center;justify-content:flex-end;gap:9px;white-space:nowrap}.site-footer .footer-legal a{display:inline;margin:0}.site-footer .footer-legal span{display:inline;color:#7f8b93}.site-footer .footer-bottom>span:first-child{white-space:nowrap}.site-footer .footer-brand{color:var(--text);font-weight:900}.footer-bottom a{display:inline;color:inherit;margin:0}.footer-bottom a:hover{color:var(--accent)}.footer-bottom{border-top:1px solid var(--line);margin-top:32px;padding-top:18px;display:flex;align-items:center;justify-content:space-between;gap:16px;color:#7f8b93;font-size:.82rem}.footer-bottom .footer-legal{margin-left:auto}.sponsor{font-size:.82rem;color:#7f8b93}.source-list li{margin-bottom:10px}.toc{background:#10171b;border:1px solid var(--line);border-radius:15px;padding:17px}.toc a{display:block;padding:5px 0;color:#b9c4ca}.logo-panel{display:flex;align-items:center;gap:15px;background:#11171b;border:1px solid var(--line);border-radius:18px;padding:18px}.logo-large{width:58px;height:58px;border-radius:15px;background:var(--accent);color:#0a0e10;display:grid;place-items:center;font-weight:950}.search-box{margin-bottom:20px}.search-box input{max-width:620px}.html-sitemap li{margin:8px 0}.backtop{position:fixed;right:18px;bottom:18px;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:#151d22;color:var(--accent);display:none;place-items:center;cursor:pointer}.backtop.show{display:grid}@media(max-width:1100px){
  .hero-grid,.results,.grid-2{grid-template-columns:1fr}
  .tool-hero .hero-grid{grid-template-columns:1fr}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1.2fr repeat(2,minmax(0,1fr))}
  .nav-links{display:none}
  .menu-btn{display:block}
  .nav-links.open{display:flex;position:absolute;top:72px;left:0;right:0;background:#080b0d;border-bottom:1px solid var(--line);padding:16px;flex-direction:column;align-items:flex-start;max-height:calc(100vh - 72px);overflow:auto}
  .container{max-width:100%}
  .hero-photo,.exercise-photo{max-width:100%}
  .prose{width:100%}
}
@media(max-width:760px){
  .container{width:min(var(--max),calc(100% - 24px))}
  .hero{padding-top:46px}
  .tool-hero .hero-grid,.calc-grid,.cards,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid>div:first-child{grid-column:1/-1}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .footer-bottom .footer-legal{margin-left:0;justify-content:flex-start;white-space:normal;flex-wrap:wrap;gap:7px}
  .site-footer .footer-legal a{white-space:nowrap}
  .exercise-photo{aspect-ratio:16/9}
  .hero-photo{aspect-ratio:16/9}
  .section-head{align-items:flex-start;flex-direction:column}
  .calc-actions .btn{min-height:44px}
  .internal-links{gap:7px}
  .prose{max-width:none}
  .prose p,.prose li{overflow-wrap:anywhere}
  .table-wrap{max-width:100%;overflow-x:auto}
}
@media(max-width:480px){
  .container{width:calc(100% - 20px)}
  .nav{min-height:64px}
  .brand{font-size:.92rem;min-width:0}
  .brand span:last-child{overflow-wrap:anywhere}
  .brand-mark{width:34px;height:34px}
  .menu-btn{padding:8px 10px}
  .nav-links.open{top:64px;max-height:calc(100vh - 64px)}
  .hero{padding:36px 0 28px}
  .section{padding:40px 0}
  .calculator{padding:15px;border-radius:16px}
  .calc-actions{width:100%}
  .calc-actions .btn{flex:1;min-width:120px}
  .footer-grid{grid-template-columns:1fr}
  .footer-grid>div:first-child{grid-column:auto}
  .footer-bottom{gap:10px}
  .footer-bottom>span:first-child{white-space:normal}
  .site-footer .footer-legal{width:100%;gap:6px}
  .badge{font-size:.74rem}
  h1{font-size:clamp(2.15rem,12vw,3.4rem)}
  h2{font-size:clamp(1.55rem,8vw,2.2rem)}
}