:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#132238;background:#edf2f6;line-height:1.4;--navy:#0b1f33;--blue:#1769e0;--blue-dark:#0d4fae;--gold:#f4bf3a;--line:#d4dee8;--muted:#60758a;--green:#087a5b;--red:#b42318;--white:#fff;--shadow:0 12px 30px rgba(11,31,51,.08)}
*{box-sizing:border-box}
html{background:var(--navy)}
body{margin:0;background:linear-gradient(180deg,#dce8f1 0,#edf2f6 260px);min-height:100vh;-webkit-tap-highlight-color:transparent}
button,input,select{font:inherit}
button{touch-action:manipulation}
h1,h2,h3,p{margin:0}
.app-header{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:11px;padding:max(12px,env(safe-area-inset-top)) max(14px,calc((100vw - 760px)/2)) 12px;background:rgba(11,31,51,.96);backdrop-filter:blur(18px);color:white;border-bottom:1px solid rgba(255,255,255,.1)}
.app-header h1{font-size:1.05rem;letter-spacing:-.01em}.app-header p{font-size:.72rem;color:#aebdca;margin-top:1px}.brand-mark{display:grid;place-items:center;width:44px;height:38px;border-radius:9px;background:var(--gold);color:var(--navy);font-weight:950;font-size:.76rem;letter-spacing:.02em}.status-pill{font-size:.68rem;font-weight:800;padding:5px 8px;border-radius:999px;background:#123e35;color:#8de8c5}.status-pill.is-offline{background:#4a3517;color:#ffd579}
main{max-width:760px;margin:0 auto;padding:14px 12px calc(110px + env(safe-area-inset-bottom))}
.card{background:rgba(255,255,255,.98);border:1px solid rgba(180,196,210,.75);border-radius:18px;padding:17px;margin-bottom:13px;box-shadow:var(--shadow)}
.hero{display:flex;align-items:end;justify-content:space-between;gap:16px;background:linear-gradient(135deg,#0b1f33,#163c62);color:white;border:0}.hero h2{font-size:1.45rem;letter-spacing:-.035em;margin:3px 0 5px}.hero p{color:#c6d4df;font-size:.86rem;max-width:450px}.eyebrow{display:block;color:var(--blue);font-size:.67rem;font-weight:900;text-transform:uppercase;letter-spacing:.11em}.hero .eyebrow{color:#75b4ff}.ghost-button{min-height:44px;white-space:nowrap;border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.08);color:white;border-radius:11px;padding:0 12px;font-size:.8rem;font-weight:800}
.stepper{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:14px 0}.step{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;border:1px solid #c8d4df;background:rgba(255,255,255,.75);color:#60758a;border-radius:12px;font-size:.78rem;font-weight:800}.step span{display:grid;place-items:center;width:23px;height:23px;border-radius:50%;background:#dbe4ec}.step.is-active{background:var(--navy);color:white;border-color:var(--navy)}.step.is-active span{background:var(--gold);color:var(--navy)}.step.is-complete{color:var(--green);border-color:#a6d7c8;background:#f3fcf8}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:13px}.section-heading h2{font-size:1.12rem;letter-spacing:-.02em}.field-label,.field-row label,.field label{display:block;color:#324a60;font-size:.78rem;font-weight:850;margin-bottom:6px}.field-label span{font-weight:600;color:var(--muted)}
.text-input,.field input,.field select,.field-row input{width:100%;height:50px;border:1px solid #aebfce;border-radius:11px;padding:0 13px;background:#fff;color:#132238;font-size:16px;outline:none}.text-input:focus,.field input:focus,.field select:focus,.field-row input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(23,105,224,.14)}
.choice-grid{display:grid;gap:9px}.two-up{grid-template-columns:repeat(2,1fr)}.choice-card{min-height:104px;border:1px solid #bdcbd7;border-radius:14px;background:#f7f9fb;color:#324a60;padding:12px;text-align:left}.choice-card strong,.choice-card small{display:block}.choice-card strong{font-size:.95rem;color:#132238}.choice-card small{font-size:.72rem;margin-top:3px;color:var(--muted)}.choice-icon{display:block;font-size:1.65rem;line-height:1;color:var(--blue);margin-bottom:10px}.choice-card.is-selected{border:2px solid var(--blue);background:#eef5ff;padding:11px;box-shadow:0 0 0 3px rgba(23,105,224,.08)}
.beam-card{overflow:hidden}.beam-title{display:flex;align-items:center;justify-content:space-between;padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line)}.beam-title h2{font-size:1.1rem}.beam-badge{font-size:.68rem;background:#e8f1ff;color:#0d56ba;padding:5px 8px;border-radius:999px;font-weight:850}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.field.full{grid-column:1/-1}.field-note{display:block;color:var(--muted);font-size:.68rem;margin-top:5px}.number-control{display:flex}.number-control input{border-radius:11px 0 0 11px}.number-control span{display:grid;place-items:center;min-width:48px;border:1px solid #aebfce;border-left:0;border-radius:0 11px 11px 0;background:#e8eef3;color:#41596f;font-weight:850}.field-row{margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.preset-card{background:linear-gradient(135deg,#fff,#f4f8fc)}.preset-scroll{display:flex;gap:8px;overflow-x:auto;padding:2px 1px 7px;scrollbar-width:none}.preset-scroll::-webkit-scrollbar{display:none}.preset{flex:0 0 auto;min-height:44px;border:1px solid #b9c8d5;border-radius:999px;background:white;color:#3d556b;padding:0 14px;font-size:.8rem;font-weight:850}.preset.is-selected{background:var(--navy);border-color:var(--navy);color:white}.helper{font-size:.72rem;color:var(--muted);margin-top:7px}
.review-list{display:grid;gap:9px}.review-row{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px solid var(--line)}.review-row:last-child{border:0}.review-row span{color:var(--muted);font-size:.78rem}.review-row strong{text-align:right;font-size:.86rem}.notice-card{display:flex;gap:8px;align-items:center;margin:0 2px 13px;padding:12px 14px;background:#fff8e7;border:1px solid #ead18d;border-radius:13px;color:#694a00;font-size:.76rem}.notice-card span{color:#7d6224}
.action-dock{position:fixed;z-index:25;left:0;right:0;bottom:0;display:flex;gap:9px;padding:10px max(12px,calc((100vw - 760px)/2)) calc(10px + env(safe-area-inset-bottom));background:rgba(247,250,252,.94);backdrop-filter:blur(18px);border-top:1px solid #cbd7e1}.primary-button,.secondary-button{height:54px;border-radius:14px;font-weight:900;border:0}.primary-button{flex:1;background:linear-gradient(180deg,#1e78f0,#0e5fcb);color:white;box-shadow:0 8px 18px rgba(23,105,224,.26)}.secondary-button{width:92px;background:#e4ebf1;color:#324a60}.primary-button:active,.secondary-button:active,.choice-card:active,.preset:active{transform:scale(.985)}
.errors{background:#fff1f0;border:1px solid #f1aaa4;color:#8d1b14;border-radius:14px;padding:14px;margin-bottom:13px;font-size:.85rem}.errors ul{padding-left:20px;margin:8px 0 0}
.result-card{border-top:5px solid var(--green)}.result-hero{display:flex;align-items:start;justify-content:space-between;gap:12px;margin-bottom:14px}.result-hero h2{font-size:1.15rem}.result-hero p{color:var(--muted);font-size:.75rem;margin-top:3px}.governing-pill{font-size:.66rem;font-weight:900;background:#dff5ec;color:#086049;border-radius:999px;padding:6px 9px;text-align:center}.field-pick{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:14px;border-radius:14px;background:linear-gradient(135deg,#0b1f33,#174d77);color:white;margin-bottom:12px}.field-pick span{display:block;font-size:.7rem;color:#a9c5da;text-transform:uppercase;font-weight:850;letter-spacing:.08em}.field-pick strong{display:block;font-size:1.7rem;letter-spacing:-.03em;margin-top:1px}.field-pick small{display:block;color:#c9d9e5;margin-top:2px}.field-pick .beam-weight{text-align:right;font-size:1rem;font-weight:850;color:var(--gold)}
.metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:13px}.metric{background:#f1f5f8;border-radius:11px;padding:11px}.metric span{display:block;color:var(--muted);font-size:.64rem;text-transform:uppercase;font-weight:850;letter-spacing:.04em}.metric strong{display:block;margin-top:3px;font-size:.9rem}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}.shape-table{width:100%;border-collapse:collapse;min-width:520px;font-size:.78rem}.shape-table th,.shape-table td{text-align:left;border-bottom:1px solid var(--line);padding:10px 8px}.shape-table th{color:var(--muted);font-size:.64rem;text-transform:uppercase;background:#f5f8fa}.shape-table tr:last-child td{border-bottom:0}.shape-table tr.is-pick{background:#eef9f5}.shape-table td strong{color:#0a654f}.not-good{color:var(--red);font-weight:850}.calc-details{margin-top:12px}.calc-details summary{min-height:44px;display:flex;align-items:center;color:var(--blue);font-size:.8rem;font-weight:850;cursor:pointer}.calc-details pre{white-space:pre-wrap;background:var(--navy);color:#dce8f1;padding:12px;border-radius:11px;font-size:.72rem;overflow:auto}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:13px}.share-button,.new-button{height:48px;border-radius:12px;font-weight:850}.share-button{border:0;background:var(--blue);color:white}.new-button{border:1px solid #b8c7d4;background:white;color:#324a60}
.calc-workbook{margin-top:14px;border:1px solid #b9c8d5;border-radius:14px;background:#f8fafc;overflow:hidden}.calc-workbook>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:62px;padding:12px 14px;background:#eaf2f9;color:var(--navy);cursor:pointer;list-style:none}.calc-workbook>summary::-webkit-details-marker{display:none}.calc-workbook>summary strong,.calc-workbook>summary small{display:block}.calc-workbook>summary strong{font-size:.88rem}.calc-workbook>summary small{margin-top:2px;color:var(--muted);font-size:.68rem}.summary-action{color:var(--blue);font-size:.7rem;font-weight:850}.calc-workbook:not([open]) .summary-action{font-size:0}.calc-workbook:not([open]) .summary-action::after{content:'Expand';font-size:.7rem}.workbook-body{padding:12px}.workbook-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 11px;margin-bottom:10px;background:#fff;border:1px solid var(--line);border-radius:10px}.workbook-toolbar p{font-size:.68rem;color:var(--muted)}.copy-math{flex:0 0 auto;min-height:40px;border:0;border-radius:9px;padding:0 11px;background:var(--blue);color:#fff;font-size:.72rem;font-weight:850}.workbook-warning{display:flex;flex-direction:column;gap:4px;margin-bottom:10px;padding:11px 12px;border:1px solid #e4b44f;border-radius:10px;background:#fff6dc;color:#664700}.workbook-warning strong{font-size:.74rem}.workbook-warning span{font-size:.68rem;line-height:1.45}.math-section{margin-top:10px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:11px}.math-section h3{margin-bottom:9px;font-size:.83rem;color:var(--navy)}.equation-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:9px 0;border-top:1px solid #e5ebf0}.equation-row:first-of-type{border-top:0}.equation-row strong,.equation-row code{display:block}.equation-row strong{font-size:.72rem;color:#324a60}.equation-row code{margin-top:3px;white-space:normal;color:#5f7387;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.66rem;line-height:1.45}.equation-row>span{text-align:right;color:#102a43;font-size:.72rem;font-weight:850}.case-calculation{margin-top:10px;padding:10px;border:1px solid #d7e0e8;border-radius:10px;background:#fbfcfd}.case-calculation.is-governing{border:2px solid #57ad91;background:#f1faf7;padding:9px}.case-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:4px}.case-heading h4{font-size:.76rem}.case-heading span{font-size:.62rem;font-weight:900;color:#087056;background:#dff5ec;border-radius:999px;padding:4px 7px}.connection-result{border-left:5px solid var(--gold)}.recent-card{margin-top:15px}.text-button{border:0;background:transparent;color:var(--blue);font-weight:850;font-size:.76rem}.recent-item{display:grid;grid-template-columns:1fr auto;gap:12px;padding:11px 0;border-top:1px solid var(--line)}.recent-item:first-child{border-top:0}.recent-item strong,.recent-item span{display:block}.recent-item strong{font-size:.86rem}.recent-item span{color:var(--muted);font-size:.72rem;margin-top:2px}.recent-beam{text-align:right;color:var(--green)!important;font-weight:900!important;font-size:.88rem!important}
footer{text-align:center;color:#708497;font-size:.68rem;padding:4px 14px 20px}.hidden{display:none!important}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media(max-width:560px){.workbook-toolbar{align-items:stretch;flex-direction:column}.copy-math{width:100%}.equation-row{grid-template-columns:1fr}.equation-row>span{text-align:left;color:#087056}.math-section{padding:10px}main{padding-left:10px;padding-right:10px}.card{padding:15px;border-radius:16px}.hero{align-items:start}.hero .ghost-button{display:none}.hero h2{font-size:1.3rem}.grid{grid-template-columns:1fr}.field.full{grid-column:auto}.app-header{padding-left:12px;padding-right:12px}.result-hero{align-items:center}.notice-card{align-items:start;flex-direction:column}.step{font-size:.72rem}.step span{width:21px;height:21px}.shape-table{font-size:.75rem}}
@media(min-width:700px){.metrics{grid-template-columns:repeat(3,1fr)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}