:root{color-scheme:light;--navy-950:#061a2c;--navy-900:#0b2d4d;--navy-800:#123f68;--blue-700:#14689d;--teal-600:#078f93;--teal-500:#0ca7a4;--slate-900:#152638;--slate-700:#405467;--slate-500:#6b7c8d;--slate-300:#c8d3dc;--slate-200:#dfe7ed;--slate-100:#f2f6f8;--white:#fff;--shadow:0 18px 45px rgba(10,44,74,.1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}html{min-width:320px;background:var(--slate-100)}body{margin:0;min-height:100vh;color:var(--slate-900);background:var(--slate-100)}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) 56%,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:0 0 auto}.brand-mark circle:not(:first-child){fill:#59d3cc}.brand strong{display:block;font-size:1.12rem;line-height:1.2;letter-spacing:-.01em}.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:700;text-transform:uppercase;letter-spacing:.08em;white-space:nowrap}
.app-shell{width:min(1440px,100%);min-height:calc(100vh - 76px);margin:0 auto;display:grid;grid-template-columns:248px minmax(0,1fr)}.tool-nav{padding:34px 18px 24px;background:#e7eff4;border-right:1px solid #cedbe4;display:flex;flex-direction:column}.nav-label{margin:0 14px 12px;color:var(--slate-500);font-size:.75rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.tool-tabs{display:grid;gap:7px}.tool-tab{width:100%;min-height:50px;padding:8px 11px;border:1px solid transparent;border-radius:10px;color:var(--slate-700);background:transparent;display:flex;align-items:center;gap:11px;text-align:left;font-weight:650}.tool-tab:hover{background:rgba(255,255,255,.62);color:var(--navy-900)}.tool-tab:focus-visible,.reset-button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(12,167,164,.28);outline-offset:2px}.tool-tab.active{color:var(--navy-900);background:#fff;border-color:#d4e0e7;box-shadow:0 7px 20px rgba(15,59,92,.08)}.tab-icon{width:36px;height:30px;border-radius:7px;color:var(--blue-700);background:#dbeaf2;display:grid;place-items:center;font-size:.78rem;font-weight:850;letter-spacing:-.03em}.tool-tab.active .tab-icon{color:#fff;background:linear-gradient(135deg,var(--blue-700),var(--teal-600))}.field-note{margin:auto 8px 0;padding:15px;border-radius:10px;color:var(--slate-700);background:rgba(255,255,255,.58);display:flex;gap:9px;font-size:.78rem;line-height:1.45}.field-note p{margin:0}.note-dot{width:8px;height:8px;margin-top:5px;border-radius:50%;background:var(--teal-500);box-shadow:0 0 0 4px rgba(12,167,164,.12);flex:0 0 auto}
.workspace{min-width:0;padding:clamp(24px,4vw,48px)}.workspace-heading{max-width:1080px;margin:0 auto 26px;display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.eyebrow{margin:0 0 6px;color:var(--teal-600);font-size:.76rem;font-weight:850;letter-spacing:.13em;text-transform:uppercase}h1{margin:0;color:var(--navy-900);font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.15;letter-spacing:-.035em}.workspace-heading 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:700}.reset-button:hover{border-color:var(--blue-700)}.tool-panel{max-width:1080px;margin:0 auto}.calculator-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:stretch}.input-card,.result-card{min-width:0;padding:clamp(20px,3vw,30px);border:1px solid var(--slate-200);border-radius:14px;background:#fff;box-shadow:var(--shadow)}.result-card{color:#fff;border-color:transparent;background:linear-gradient(145deg,var(--navy-900),#0c375d 66%,#10496c);position:relative;overflow:hidden}.result-card:after{content:"";width:230px;height:230px;border:1px solid rgba(92,215,207,.16);border-radius:50%;position:absolute;right:-115px;top:-130px}.card-heading{display:flex;align-items:center;gap:11px;margin-bottom:24px}.card-heading h2{margin:0;font-size:1rem;letter-spacing:-.01em}.step-number{width:27px;height:27px;border-radius:50%;color:#fff;background:var(--blue-700);display:grid;place-items:center;font-size:.75rem;font-weight:850}.step-number.teal{color:var(--navy-950);background:#65ddd4}
label,legend{color:var(--slate-700);font-size:.86rem;font-weight:700}label{display:grid;gap:7px;margin-bottom:17px}fieldset{min-width:0;margin:1px 0 17px;padding:0;border:0}legend{margin-bottom:8px}input,select{width:100%;min-height:46px;padding:10px 12px;border:1px solid var(--slate-300);border-radius:8px;color:var(--slate-900);background:#fbfdfe;font-size:1rem}input:hover,select:hover{border-color:#8ca6b8}.field-row.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:13px}.segmented-control{padding:4px;border:1px solid var(--slate-300);border-radius:9px;background:var(--slate-100);display:grid;grid-template-columns:repeat(3,1fr);gap:3px}.segmented-control.two-segments{grid-template-columns:repeat(2,1fr)}.segmented-control label{margin:0;display:block}.segmented-control input{position:absolute;opacity:0;pointer-events:none}.segmented-control span{min-height:38px;padding:8px 6px;border-radius:6px;display:grid;place-items:center;color:var(--slate-700);font-size:.79rem;text-align:center}.segmented-control input:checked+span{color:var(--navy-900);background:#fff;box-shadow:0 2px 7px rgba(12,45,75,.12);font-weight:800}.segmented-control input:focus-visible+span{outline:3px solid rgba(12,167,164,.28)}
.primary-result{min-height:130px;padding:20px 0 25px;display:flex;flex-direction:column;justify-content:center;border-bottom:1px solid rgba(255,255,255,.15)}.primary-result span{color:#b8cede;font-size:.82rem;font-weight:650;text-transform:uppercase;letter-spacing:.09em}.primary-result strong{margin-top:8px;color:#70e2db;font-size:clamp(1.9rem,4vw,2.8rem);line-height:1.08;letter-spacing:-.04em;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:.94rem}.result-list.compact>div{min-height:39px;padding:8px 0}.formula-disclosure{margin-top:13px;color:#c9dce8;font-size:.76rem}.formula-disclosure summary{width:max-content;cursor:pointer;color:#9eddd8;font-weight:750}.formula-disclosure summary:hover{color:#fff}.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:.76rem;line-height:1.45}.validation-message{min-height:1.25rem;margin:12px 0 0;color:#ffb4ab;font-size:.82rem;font-weight:700}.temperature-results{display:grid;grid-template-columns:1fr 1fr;gap:12px}.temperature-results div{min-height:113px;padding:17px;border:1px solid rgba(255,255,255,.13);border-radius:10px;background:rgba(255,255,255,.055);display:flex;flex-direction:column;justify-content:center}.temperature-results span{color:#b8cede;font-size:.8rem}.temperature-results strong{margin-top:9px;color:#70e2db;font-size:1.32rem}.workspace-footer{max-width:1080px;margin:25px auto 0;padding-top:18px;border-top:1px solid var(--slate-200);color:var(--slate-500);display:flex;justify-content:space-between;gap:20px;font-size:.76rem}.workspace-footer p{margin:0}
@media(max-width:1280px) and (min-width:901px){.app-shell{grid-template-columns:218px minmax(0,1fr)}.tool-nav{padding-left:12px;padding-right:12px}.workspace{padding-left:30px;padding-right:30px}.calculator-grid{gap:16px}}
@media(max-height:1100px) and (min-width:721px){.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}.app-shell{width:min(980px,100%);min-height:calc(100vh - 52px);grid-template-columns:190px minmax(0,1fr)}.tool-nav{padding:12px 9px 10px}.nav-label{margin:0 9px 7px;font-size:.68rem}.tool-tabs{gap:4px}.tool-tab{min-height:36px;padding:4px 7px;border-radius:8px;gap:8px;font-size:.82rem}.tab-icon{width:29px;height:24px;font-size:.7rem}.field-note{margin-left:4px;margin-right:4px;padding:8px;font-size:.7rem}.workspace{padding:11px 14px 13px}.workspace-heading{max-width:760px;margin-bottom:8px;align-items:center}.eyebrow{display:none}.workspace-heading h1{font-size:1.35rem}.workspace-heading p:last-child{margin-top:2px;font-size:.82rem;line-height:1.35}.reset-button{padding:6px 10px;font-size:.82rem}.tool-panel{max-width:760px}.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:.92rem}.step-number{width:23px;height:23px;font-size:.7rem}label{gap:4px;margin-bottom:8px}fieldset{margin-bottom:8px}legend{margin-bottom:4px}input,select{min-height:35px;padding:5px 9px;font-size:.9rem}.field-row.two-columns{gap:8px}.segmented-control{padding:3px}.segmented-control span{min-height:28px;padding:4px;font-size:.72rem}.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,.result-list.compact>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}.validation-message{min-height:.7rem;margin-top:3px}.temperature-results{gap:7px}.temperature-results div{min-height:62px;padding:8px}.temperature-results span{font-size:.72rem}.temperature-results strong{margin-top:4px;font-size:1rem}.workspace-footer{max-width:760px;margin-top:8px;padding-top:8px;font-size:.7rem}}
@media(max-width:900px){.app-shell{grid-template-columns:1fr}.tool-nav{padding:9px 14px;border-right:0;border-bottom:1px solid #cedbe4;display:block;overflow:hidden}.nav-label,.field-note{display:none}.tool-tabs{display:flex;overflow-x:auto;gap:6px;padding-bottom:3px;scrollbar-width:thin}.tool-tab{width:auto;min-width:max-content;min-height:36px;padding:4px 8px}.tab-icon{width:29px;height:24px}.workspace{width:min(790px,100%);margin:0 auto}}
@media(max-width:720px){.site-header{min-height:68px;padding:10px 16px}.brand-mark{width:40px;height:40px}.brand strong{font-size:.96rem}.brand small{font-size:.69rem}.free-badge{display:none}.workspace{padding:22px 15px 30px}.workspace-heading{margin-bottom:18px}.workspace-heading p:last-child{font-size:.91rem}.reset-button{padding:8px 11px}.calculator-grid{grid-template-columns:1fr;gap:14px}.input-card,.result-card{padding:20px;border-radius:12px}.primary-result{min-height:108px}.workspace-footer{display:grid}}
@media(max-width:420px){.brand small{display:none}.brand strong{max-width:205px}.field-row.two-columns{grid-template-columns:1fr;gap:0}.segmented-control{grid-template-columns:1fr}.temperature-results{grid-template-columns:1fr}.result-list>div{align-items:flex-start}}
@media(prefers-reduced-motion:no-preference){.tool-panel.active{animation:reveal 180ms ease-out}@keyframes reveal{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}}