*{box-sizing:border-box}:root{--bg:#f5f7f6;--card:#fff;--text:#17201c;--muted:#65716b;--border:#dce4e0;--primary:#246b4a;--primary-hover:#1c593d;--result-bg:#f0f8f4}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}a{color:var(--primary)}header{background:#fff;border-bottom:1px solid var(--border)}.header-inner{max-width:1000px;margin:0 auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-size:22px;font-weight:750;letter-spacing:-.5px;white-space:nowrap}.brand a{color:inherit;text-decoration:none}.brand span{color:var(--primary)}nav{display:flex;align-items:center;gap:22px}nav a{color:#36423c;text-decoration:none;font-size:15px;font-weight:650}nav a:hover,nav a[aria-current="page"]{color:var(--primary)}main{width:min(100% - 32px,760px);margin:48px auto 70px}.wide-main{width:min(100% - 32px,900px)}.intro{text-align:center;margin-bottom:28px}.intro h1,h1{font-size:clamp(32px,6vw,46px);line-height:1.08;letter-spacing:-1.5px;margin:0 0 12px}.intro p,.lead{margin:0 auto;max-width:650px;color:var(--muted);font-size:17px}.card,.calculator{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:26px;box-shadow:0 8px 30px rgba(20,40,30,.05)}.card h1{font-size:38px}.unit-toggle{display:grid;grid-template-columns:1fr 1fr;background:#eef2f0;border-radius:10px;padding:4px;margin-bottom:26px}.unit-toggle button{border:0;background:transparent;padding:11px;border-radius:8px;cursor:pointer;font-size:15px;font-weight:650;color:var(--muted)}.unit-toggle button.active{background:#fff;color:var(--text);box-shadow:0 1px 4px rgba(0,0,0,.08)}.field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.field{min-width:0}.field.full{grid-column:1/-1}label{display:block;margin-bottom:7px;font-size:14px;font-weight:650}.input-with-unit{display:grid;grid-template-columns:1fr 90px;gap:8px}input,select{width:100%;height:50px;padding:0 14px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text);font:inherit;font-size:16px;outline:none;transition:border-color .15s,box-shadow .15s}input:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(36,107,74,.12)}.check-row{display:flex;align-items:center;gap:10px;margin-top:20px;color:var(--muted);font-size:14px}.check-row input{width:18px;height:18px;padding:0;accent-color:var(--primary);flex-shrink:0}.calculate{width:100%;border:0;border-radius:11px;padding:15px 20px;margin-top:24px;background:var(--primary);color:#fff;font-size:17px;font-weight:700;cursor:pointer;transition:background .15s,transform .05s}.calculate:hover{background:var(--primary-hover)}.calculate:active{transform:translateY(1px)}.error{display:none;margin-top:16px;padding:12px 14px;border-radius:9px;background:#fff1f1;color:#9b2929;font-size:14px}.result{display:none;margin-top:24px;background:var(--result-bg);border:1px solid #cfe4d8;border-radius:14px;padding:24px;text-align:center}.result-label{font-size:13px;font-weight:750;color:var(--primary);text-transform:uppercase;letter-spacing:1px}.result-main{margin:7px 0 2px;font-size:clamp(38px,9vw,54px);line-height:1;font-weight:800;letter-spacing:-2px}.result-secondary{font-size:20px;font-weight:650;margin-bottom:4px}.result-tertiary{font-size:16px;color:var(--muted);margin-bottom:16px}.result-details{border-top:1px solid #cee2d7;padding-top:15px;display:grid;gap:7px;text-align:left;color:var(--muted);font-size:14px}.detail{display:flex;justify-content:space-between;gap:20px}.detail strong{color:var(--text);text-align:right}.note{margin-top:18px;color:var(--muted);font-size:13px;text-align:center}.content{margin-top:54px}.content section{margin-bottom:42px}.content h2,.section-title{font-size:27px;line-height:1.25;letter-spacing:-.6px;margin:0 0 14px}.content h3{font-size:20px;margin:26px 0 8px}.content p,.card p{margin:0 0 16px;color:#36423c}.content ul,.card ul{padding-left:22px;color:#36423c}.content li,.card li{margin-bottom:8px}.example-box{background:#fff;border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:10px;padding:20px;margin-top:20px}.depth-table,.content table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-top:18px;line-height:1.45}.depth-table th,.depth-table td,.content table th,.content table td{padding:13px 16px;text-align:left;vertical-align:top;border-bottom:1px solid var(--border)}.depth-table th,.content table th{background:#eef2f0;font-size:14px;font-weight:750;color:var(--text)}.depth-table td,.content table td{color:#36423c}.depth-table th+th,.depth-table td+td,.content table th+th,.content table td+td{border-left:1px solid #edf1ef}.depth-table tr:last-child td,.content table tr:last-child td{border-bottom:0}.faq-item{padding:20px 0;border-bottom:1px solid var(--border)}.faq-item:first-of-type{border-top:1px solid var(--border)}.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0}.tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:26px}.tool-card{display:block;background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;text-decoration:none;color:inherit;transition:border-color .15s,transform .15s}.tool-card:hover{border-color:#b9cec3;transform:translateY(-2px)}.tool-card h2{margin:0 0 8px;font-size:21px}.tool-card p{margin:0;color:var(--muted)}.tool-card .tag{display:inline-block;margin-bottom:12px;font-size:12px;font-weight:750;text-transform:uppercase;letter-spacing:.7px;color:var(--primary)}.related{margin-top:42px;padding:22px;border:1px solid var(--border);border-radius:14px;background:#fff}.related h2{font-size:21px;margin:0 0 12px}.related-links{display:flex;flex-wrap:wrap;gap:10px 16px}.related a{font-weight:650;text-decoration:none}.updated{color:var(--muted);font-size:14px;margin-bottom:30px}footer{text-align:center;padding:30px 20px;color:var(--muted);font-size:13px}footer a{color:inherit}footer .footer-links{display:flex;justify-content:center;flex-wrap:wrap;gap:8px 14px;margin-bottom:8px}@media(max-width:560px){.header-inner{padding:14px 14px;gap:14px}.brand{font-size:20px}nav{gap:14px}nav a{font-size:14px}main,.wide-main{width:min(100% - 20px,760px);margin-top:30px}.calculator,.card{padding:18px;border-radius:14px}.field-grid,.tool-grid{grid-template-columns:1fr;gap:15px}.field.full{grid-column:auto}.input-with-unit{grid-template-columns:1fr 85px}.content{margin-top:42px}.content h2,.section-title{font-size:24px}.depth-table,.content table{font-size:14px;display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}.depth-table th,.depth-table td,.content table th,.content table td{padding:11px 12px;min-width:130px}.header-inner{align-items:flex-start}.header-inner nav{padding-top:3px}}@media(max-width:380px){.header-inner{flex-direction:column;align-items:flex-start}.header-inner nav{width:100%;justify-content:flex-start}}
/* Home and shared navigation */
.home-hero{background:linear-gradient(135deg,#163e2e,#246b4a);color:#fff;border-radius:22px;padding:clamp(28px,6vw,62px);margin-bottom:44px}
.home-hero h1{max-width:760px;font-size:clamp(36px,6vw,58px)}
.home-hero p{max-width:650px;color:#e5f2eb;font-size:18px;margin:0 0 24px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-actions a{display:inline-block;background:#fff;color:#174631;padding:11px 18px;border-radius:10px;font-weight:750;text-decoration:none}
.hero-actions a.secondary{background:transparent;color:#fff;border:1px solid #b9d5c5}
.eyebrow{font-size:13px;font-weight:750;text-transform:uppercase;letter-spacing:.1em;color:#acd8b9;margin:0 0 12px}
.home-section{margin:42px 0}.home-section>p{max-width:720px;color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:24px 0}
.step{background:#fff;border:1px solid var(--border);padding:20px;border-radius:14px}.step strong{display:block;margin-bottom:8px}.step p{margin:0;color:var(--muted)}
.compact-grid .tool-card{padding:18px}.compact-grid .tool-card h2{font-size:19px}
nav a:focus-visible,.tool-card:focus-visible,.hero-actions a:focus-visible,.related a:focus-visible{outline:3px solid #67b784;outline-offset:3px}
@media(max-width:650px){.steps{grid-template-columns:1fr}.home-hero{border-radius:14px}}
@media(max-width:560px){.header-inner nav{flex-wrap:wrap;justify-content:flex-end;gap:4px 12px}.header-inner nav a{font-size:13px}}
[hidden]{display:none!important}.field-hint{display:block;margin-top:5px;color:var(--muted);font-size:13px;line-height:1.4}
.extra-sections{margin-top:22px;padding:18px;border:1px solid var(--border);border-radius:12px;background:#f8fbf9}.extra-sections h2{font-size:18px;margin:0 0 4px}.extra-sections p{font-size:14px;color:var(--muted);margin:0 0 12px}.sections-status{font-size:13px;color:var(--muted);margin-bottom:10px}.section-row{display:grid;grid-template-columns:1fr 1fr auto;align-items:end;gap:10px;margin:12px 0;padding-top:12px;border-top:1px solid var(--border)}.section-input{display:flex;align-items:center;gap:6px}.section-input span{min-width:20px;color:var(--muted);font-size:14px}.add-section,.remove-section{border:1px solid var(--primary);border-radius:8px;background:#fff;color:var(--primary);padding:9px 12px;cursor:pointer;font:inherit;font-size:14px;font-weight:700}.add-section:hover,.remove-section:hover{background:#eef7f2}.remove-section{border-color:var(--border);color:var(--muted);height:50px}.section-row input{min-width:0}@media(max-width:560px){.section-row{grid-template-columns:1fr 1fr}.remove-section{grid-column:1/-1;height:40px}}
.unit-help{font-size:13px;color:var(--muted);margin:-14px 0 19px;line-height:1.45}