:root{color-scheme:light;--navy-950:#061a2c;--navy-900:#0b2d4d;--navy-800:#123f68;--blue:#176e9e;--teal:#078f93;--cyan:#70e2db;--slate-900:#152638;--slate-700:#405467;--slate-500:#6b7c8d;--slate-300:#c7d3dc;--slate-200:#dfe7ed;--white:#fff;--shadow:0 18px 44px rgba(10,44,74,.1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}[hidden]{display:none!important}html{min-width:320px;background:#f3f7f9}body{margin:0;min-height:100vh;color:var(--slate-900);background:linear-gradient(180deg,#f9fbfc,#edf4f7)}button,input,select{font:inherit}button{cursor:pointer}.site-header{min-height:76px;padding:12px clamp(18px,4vw,52px);color:#fff;background:linear-gradient(105deg,var(--navy-950),var(--navy-900) 58%,var(--navy-800));display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:0 5px 18px rgba(4,25,43,.18)}.brand{color:inherit;text-decoration:none;display:inline-flex;align-items:center;gap:12px}.brand-mark{width:46px;height:46px;color:#59d3cc;flex:none}.brand strong{display:block;font-size:1.12rem;line-height:1.2}.brand small{display:block;margin-top:4px;color:#bdd2e1;font-size:.78rem}.free-badge{padding:7px 12px;border:1px solid rgba(123,225,218,.45);border-radius:999px;color:#b8f2ee;background:rgba(7,143,147,.15);font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;white-space:nowrap}
.page-shell{width:min(1180px,100%);margin:0 auto;padding:clamp(26px,4vw,48px) clamp(16px,4vw,38px) 42px}.intro-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:22px}.eyebrow{margin:0 0 7px;color:var(--teal);font-size:.76rem;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.intro-row h1{margin:0;color:var(--navy-900);font-size:clamp(1.75rem,4vw,2.55rem);line-height:1.12;letter-spacing:-.04em}.intro-row p:last-child{margin:8px 0 0;color:var(--slate-700);font-size:1rem;line-height:1.5}.reset-button{padding:9px 15px;border:1px solid var(--slate-300);border-radius:8px;color:var(--navy-900);background:#fff;font-weight:750}.calculator-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.input-card,.result-card{min-width:0;padding:clamp(21px,3vw,31px);border:1px solid var(--slate-200);border-radius:15px;background:#fff;box-shadow:var(--shadow)}.result-card{color:#fff;border-color:transparent;background:linear-gradient(145deg,var(--navy-900),#0c385e 68%,#0f496b);position:relative;overflow:hidden}.card-heading{display:flex;align-items:center;gap:11px;margin-bottom:24px}.card-heading h2,.card-heading p{margin:0}.card-heading h2{font-size:1.03rem}.card-heading p{margin-top:4px;color:var(--slate-500);font-size:.76rem}.card-heading.light p{color:#b8cede}.step{width:28px;height:28px;border-radius:50%;color:#fff;background:var(--blue);display:grid;place-items:center;font-size:.76rem;font-weight:850;flex:none}.card-heading.light .step{color:var(--navy-950);background:var(--cyan)}label{display:grid;gap:7px;margin-bottom:17px;color:var(--slate-700);font-size:.87rem;font-weight:700}input,select{width:100%;min-height:47px;padding:10px 12px;border:1px solid var(--slate-300);border-radius:8px;color:var(--slate-900);background:#fbfdfe;font-size:1rem}.field-row.two-columns,.dimensions-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.dimensions-grid:not(.two-fields){grid-template-columns:repeat(3,1fr)}.primary-result{min-height:124px;padding:18px 0 24px;border-bottom:1px solid rgba(255,255,255,.15);display:flex;flex-direction:column;justify-content:center}.primary-result span{color:#b8cede;font-size:.79rem;font-weight:700;text-transform:uppercase;letter-spacing:.09em}.primary-result strong{margin-top:8px;color:var(--cyan);font-size:clamp(2rem,4.5vw,2.65rem);line-height:1.08;letter-spacing:-.045em;overflow-wrap:anywhere}.result-list{margin-top:9px}.result-list>div{min-height:43px;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:space-between;gap:16px}.result-list span{color:#b8cede;font-size:.82rem}.result-list strong{text-align:right;font-size:.93rem}.formula-disclosure{margin-top:13px;color:#c9dce8;font-size:.78rem}.formula-disclosure summary{width:max-content;cursor:pointer;color:#9eddd8;font-weight:750}.formula{margin:8px 0 0;padding:11px 13px;border-radius:7px;color:#c9dce8;background:rgba(0,0,0,.14);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.75rem}.status-message{min-height:1.25rem;margin:9px 0 0;color:#ffb4ab;font-size:.82rem;font-weight:700}.field-guidance{margin-top:14px;padding:14px 18px;border:1px solid #d4e3e8;border-left:4px solid var(--teal);border-radius:8px;color:var(--slate-700);background:rgba(255,255,255,.68);display:grid;grid-template-columns:max-content 1fr;gap:16px;font-size:.8rem;line-height:1.45}
@media(max-height:1100px) and (min-width:781px){.site-header{min-height:52px;padding-top:5px;padding-bottom:5px}.brand{gap:9px}.brand-mark{width:32px;height:32px}.brand strong{font-size:.92rem}.brand small{margin-top:1px;font-size:.68rem}.free-badge{padding:4px 9px;font-size:.68rem}.page-shell{width:min(760px,100%);padding-top:11px;padding-bottom:14px}.intro-row{align-items:center;margin-bottom:8px}.eyebrow{display:none}.intro-row h1{font-size:1.35rem}.intro-row p:last-child{margin-top:2px;font-size:.82rem;line-height:1.35}.reset-button{padding:6px 10px;font-size:.82rem}.calculator-grid{gap:10px}.input-card,.result-card{padding:12px 14px;border-radius:11px}.card-heading{gap:8px;margin-bottom:10px}.card-heading h2{font-size:.94rem}.card-heading p{margin-top:1px;font-size:.7rem}.step{width:23px;height:23px;font-size:.7rem}label{gap:4px;margin-bottom:8px}.field-row.two-columns,.dimensions-grid{gap:8px}input,select{min-height:35px;padding:5px 9px;font-size:.9rem}.primary-result{min-height:58px;padding:5px 0 8px}.primary-result span{font-size:.7rem}.primary-result strong{margin-top:2px;font-size:1.75rem}.result-list{margin-top:3px}.result-list>div{min-height:25px;padding:3px 0}.result-list span{font-size:.74rem}.result-list strong{font-size:.82rem}.formula-disclosure{margin-top:6px}.formula{margin-top:4px;padding:6px 8px}.status-message{min-height:.7rem;margin-top:3px}.field-guidance{margin-top:7px;padding:7px 10px}}
@media(max-width:780px){.calculator-grid{grid-template-columns:1fr}.dimensions-grid:not(.two-fields){grid-template-columns:1fr 1fr}.field-guidance{grid-template-columns:1fr;gap:5px}}
@media(max-width:560px){.site-header{min-height:68px;padding:10px 15px}.brand-mark{width:40px;height:40px}.brand strong{font-size:.95rem}.brand small{font-size:.69rem}.free-badge{display:none}.page-shell{padding:23px 14px 34px}.intro-row{align-items:flex-start}.field-row.two-columns,.dimensions-grid,.dimensions-grid:not(.two-fields){grid-template-columns:1fr}.input-card,.result-card{padding:20px;border-radius:12px}.primary-result{min-height:100px}}