.toolkit-page{background:var(--background);color:var(--text)}
.toolkit-hero{padding:72px 0 88px;border-bottom:1px solid var(--line)}
.toolkit-hero .eyebrow{color:#aab4bd;margin-bottom:20px}
.toolkit-hero h1{max-width:1080px;font-size:clamp(2.8rem,5.2vw,5rem);line-height:1.04}
.toolkit-lead{max-width:780px;margin-top:28px;color:#bcc3c9;font-size:1.05rem;line-height:1.8}
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--paper-line);border-left:1px solid var(--paper-line)}
.tool-card{min-height:320px;padding:30px;display:flex;flex-direction:column;border-right:1px solid var(--paper-line);border-bottom:1px solid var(--paper-line);transition:background .18s,transform .18s}
.tool-card:hover{background:#e5e7e3}
.tool-card .eyebrow{color:#626b72}
.tool-card h2{font-size:clamp(1.45rem,2vw,2rem);line-height:1.18;margin:28px 0 20px}
.tool-card p{color:#596269;font-size:.92rem;line-height:1.75}
.tool-card-link{margin-top:auto;padding-top:28px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:.82rem;font-weight:650}
.toolkit-principles{border-top:1px solid var(--line)}
.toolkit-copy-grid{display:grid;grid-template-columns:.85fr 1.35fr;gap:clamp(48px,8vw,130px)}
.toolkit-copy-grid h2{margin-top:20px;max-width:560px}
.toolkit-copy-grid>div:last-child>p{color:var(--muted)}
.calculator-hero{padding-bottom:72px}
.calculator-section{padding-top:72px}
.calculator-layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.75fr);gap:clamp(50px,7vw,110px);align-items:start}
.calculator-panel{min-width:0}
.calculator-modes{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.calculator-modes a{border:1px solid var(--paper-line);padding:10px 12px;font-family:var(--font-mono);font-size:.72rem;line-height:1.4}
.calculator-modes a[aria-current=page]{background:var(--navy);border-color:var(--navy);color:var(--text)}
.calculator-form{border-top:1px solid var(--paper-line);padding-top:28px}
.calculator-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 26px}
.calculator-field label{display:block;font-size:.82rem;font-weight:650;margin-bottom:8px}
.calculator-input{width:100%;min-height:52px;padding:12px 13px;border:1px solid #b9bdba;background:#fff;color:var(--ink);font-size:1rem}
.calculator-input:focus{border-color:var(--navy)}
.field-help{font-size:.75rem;color:#687177;margin-top:7px;line-height:1.55}
.field-error,.calculator-error{margin-top:8px;color:#8f1d1d;font-size:.8rem}
.field-error ul,.calculator-error ul{margin:0;padding-left:18px}
.calculator-submit{margin-top:30px;min-width:180px}
.calculator-results{margin-top:42px;padding:30px;background:#e4e8eb;border-left:4px solid var(--navy)}
.calculator-results>.eyebrow{color:#56616b;margin-bottom:20px}
.calculator-results dl{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:#c7cccf}
.calculator-results dl>div{background:#f8f8f5;padding:20px}
.calculator-results dt{font-size:.78rem;color:#5f676d}
.calculator-results dd{margin:8px 0 0;font-size:1.45rem;font-weight:650;letter-spacing:-.02em}
.calculator-method{background:var(--navy);color:var(--text);padding:34px}
.calculator-method>.eyebrow{color:#b8c5d5}
.calculator-method h2{font-size:1.8rem;margin:18px 0 22px}
.calculator-method .formula{font-family:var(--font-mono);font-size:.84rem;line-height:1.8;color:#e2e8ef;border-top:1px solid #4e6075;border-bottom:1px solid #4e6075;padding:20px 0;margin-bottom:28px}
.calculator-method h3{font-size:1rem;margin-bottom:12px}
.calculator-method ul{padding-left:20px;margin:0;color:#c1cbd6;font-size:.86rem;line-height:1.75}
.calculator-method li+li{margin-top:8px}
.engineering-note{margin-top:28px;padding-top:24px;border-top:1px solid #4e6075}
.engineering-note strong{font-size:.83rem}
.engineering-note p{font-size:.78rem;line-height:1.65;color:#b8c3cf;margin-top:8px}
.tool-steps{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.tool-steps li{display:grid;grid-template-columns:40px 1fr;gap:22px;padding:22px 0;border-bottom:1px solid var(--line)}
.tool-steps li>span{font-family:var(--font-mono);color:#9ca7b1;font-size:.75rem}
.tool-steps p{color:#d3d7da}
.toolkit-faq h2{margin:18px 0 38px}
.faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--paper-line);border:1px solid var(--paper-line)}
.faq-grid article{background:var(--paper);padding:28px}
.faq-grid h3{font-size:1.15rem;line-height:1.35}
.faq-grid p{margin-top:14px;color:#5d656b;font-size:.88rem;line-height:1.75}
.related-tools{border-top:1px solid var(--line)}
.related-tool-links{display:flex;flex-wrap:wrap;gap:10px}
.related-tool-links a{border:1px solid #4e555c;padding:11px 14px;font-family:var(--font-mono);font-size:.75rem;min-height:42px;display:flex;align-items:center}
.related-tool-links a:hover{background:var(--surface)}
@media(max-width:1100px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.calculator-layout{grid-template-columns:1fr}.calculator-method{max-width:none}.desktop-nav{gap:12px}.desktop-nav a{font-size:.74rem}}
@media(max-width:760px){.toolkit-hero{padding:50px 0 60px}.toolkit-lead{font-size:.98rem}.tool-grid{grid-template-columns:1fr}.tool-card{min-height:250px;padding:25px}.toolkit-copy-grid{grid-template-columns:1fr;gap:34px}.calculator-section{padding-top:52px}.calculator-fields{grid-template-columns:1fr}.calculator-results{padding:22px}.calculator-results dl{grid-template-columns:1fr}.calculator-results dd{font-size:1.25rem}.calculator-method{padding:26px 22px}.faq-grid{grid-template-columns:1fr}.section-heading{align-items:start}.related-tools .section-heading{flex-direction:column}.calculator-modes{display:grid;grid-template-columns:1fr}.calculator-modes a{text-align:center}}