:root{--blue: #007aff;--blue-press: #0062cc;--green: #34c759;--orange: #ff9500;--red: #ff3b30;--yellow: #ffcc00;--topic-fusing: #ff9500;--topic-electrical: #007aff;--topic-banks: #ff3b30;--topic-meters: #34c759;--topic-safety: #ffcc00;--topic-plant: #5856d6;--bg: #f2f2f7;--grouped: #f2f2f7;--card: #ffffff;--fill: #78788014;--fill-strong: #78788033;--separator: #3c3c4329;--separator-opaque: #c6c6c8;--label: #000000;--secondary: #3a3a3c;--tertiary: #6c6c70;--nav-bg: rgba(249, 249, 249, .94);--tab-bg: rgba(249, 249, 249, .94);--tab-inactive: #999999;--radius: 12px;--radius-lg: 16px;--font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;--nav-h: 52px;--tab-h: 49px;--safe-t: env(safe-area-inset-top, 0px);--safe-b: env(safe-area-inset-bottom, 0px)}@media(prefers-color-scheme:dark){:root{--bg: #000000;--grouped: #000000;--card: #1c1c1e;--fill: #78788033;--fill-strong: #78788052;--separator: #54545899;--separator-opaque: #38383a;--label: #ffffff;--secondary: #c7c7cc;--tertiary: #8e8e93;--nav-bg: rgba(28, 28, 30, .94);--tab-bg: rgba(28, 28, 30, .94);--tab-inactive: #8e8e93}}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{height:100%;-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--safe-t) + var(--nav-h) + 8px)}body{font-family:var(--font);background:var(--bg);color:var(--label);line-height:1.4;min-height:100%;min-height:100dvh;overflow-x:hidden;overscroll-behavior-y:none;-webkit-font-smoothing:antialiased}button,input,select{font:inherit;color:inherit}.nav-bar{position:fixed;top:0;left:0;right:0;z-index:100;padding-top:var(--safe-t);background:var(--nav-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:.5px solid var(--separator)}.nav-bar-inner{height:var(--nav-h);display:flex;align-items:center;justify-content:center;padding:0 8px 0 16px;position:relative}.nav-icon-btn{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:44px;height:44px;border:none;background:transparent;color:var(--blue);border-radius:10px;display:flex;align-items:center;justify-content:center;cursor:pointer}.nav-icon-btn svg{width:22px;height:22px}.nav-title{font-size:17px;font-weight:600;letter-spacing:-.4px;color:var(--label)}.app-main{padding-top:calc(var(--safe-t) + var(--nav-h));padding-bottom:calc(var(--safe-b) + var(--tab-h) + 40px);min-height:100dvh}.tab-panel{display:none;max-width:640px;margin:0 auto;padding:8px 16px 24px;animation:fadeIn .22s ease}.tab-panel.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.large-title{font-size:34px;font-weight:700;letter-spacing:.4px;line-height:1.15;color:var(--label);margin:4px 0 16px;padding:0 4px}.section-header{font-size:13px;font-weight:400;color:var(--secondary);text-transform:uppercase;letter-spacing:-.08px;margin:20px 4px 8px}.section-header:first-of-type{margin-top:4px}.section-footer{font-size:13px;color:var(--secondary);margin:8px 4px 0;line-height:1.35;padding:0 2px}.group{background:var(--card);border-radius:var(--radius-lg);overflow:hidden;margin-bottom:0}.group+.group{margin-top:16px}.group-row{display:flex;align-items:center;gap:12px;padding:12px 16px;min-height:44px;background:var(--card);border-bottom:.5px solid var(--separator)}.group-row:last-child{border-bottom:none}.group-body{padding:16px}.group-body+.group-body{border-top:.5px solid var(--separator)}.field-label{display:block;font-size:13px;font-weight:500;color:var(--secondary);margin-bottom:6px}.field-row{display:flex;gap:10px}.field-row>*{flex:1;min-width:0}.field{width:100%;height:44px;padding:0 14px;font-size:17px;border:none;border-radius:10px;background:var(--fill);color:var(--label);outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none}.field:focus{box-shadow:0 0 0 2px var(--blue)}select.field{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%238e8e93' d='M1.4.6L6 5.2 10.6.6 12 2 6 8 0 2z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px}.field-stack{display:flex;flex-direction:column;gap:14px}.btn{display:flex;align-items:center;justify-content:center;width:100%;height:50px;margin-top:14px;border:none;border-radius:12px;background:var(--blue);color:#fff;font-size:17px;font-weight:600;cursor:pointer;transition:transform .1s,opacity .15s}.btn:active{opacity:.85;transform:scale(.985)}.result{margin-top:14px;padding:14px 16px;border-radius:12px;background:var(--fill);text-align:center}.result-sub{font-size:13px;color:var(--secondary);margin-bottom:4px}.result-main{font-size:22px;font-weight:700;color:var(--blue);letter-spacing:-.4px}.result-grid{display:grid;grid-template-columns:1fr auto;gap:10px 16px;text-align:left;font-size:15px}.result-grid .val{font-weight:700;font-variant-numeric:tabular-nums;text-align:right}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -16px;padding:0 16px}table{width:100%;border-collapse:collapse;font-size:15px;font-variant-numeric:tabular-nums}th{font-size:13px;font-weight:500;color:var(--secondary);text-align:left;padding:8px 10px 10px 0;border-bottom:.5px solid var(--separator);white-space:nowrap}td{padding:11px 10px 11px 0;border-bottom:.5px solid var(--separator);color:var(--label)}tr:last-child td{border-bottom:none}td:last-child,th:last-child{padding-right:0;text-align:right}.callout{font-size:14px;line-height:1.4;color:var(--secondary);background:var(--fill);border-radius:10px;padding:12px 14px;margin-bottom:14px}.callout strong{color:var(--label);font-weight:600}.callout.blue{background:color-mix(in srgb,var(--blue) 12%,transparent);color:var(--label)}.callout.red{background:color-mix(in srgb,var(--red) 12%,transparent);color:var(--label)}.callout.red strong{color:var(--red)}.mono-box{font-family:var(--mono);font-size:13px;line-height:1.45;background:var(--fill);border-radius:10px;padding:12px 14px;margin-bottom:14px;color:var(--label)}.segmented{display:flex;padding:2px;background:var(--fill-strong);border-radius:9px;margin-bottom:16px;gap:0}.segmented button{flex:1;border:none;background:transparent;color:var(--label);font-size:12px;font-weight:500;height:32px;border-radius:7px;cursor:pointer;white-space:nowrap;padding:0 4px;transition:background .18s,box-shadow .18s}.segmented button.active{background:var(--card);box-shadow:0 1px 3px #0000001f,0 1px 1px #0000000a;font-weight:600}@media(prefers-color-scheme:dark){.segmented button.active{background:#636366;box-shadow:none}}.chips{display:flex;gap:8px;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -16px 16px;padding:0 16px 4px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}.chip{flex:0 0 auto;height:32px;padding:0 14px;border-radius:16px;border:none;background:var(--fill);color:var(--label);font-size:14px;font-weight:500;cursor:pointer;transition:background .15s,color .15s}.chip.active{background:var(--blue);color:#fff;font-weight:600}.chip:active{opacity:.88}.bank-panel{display:none}.bank-panel.active{display:block;animation:fadeIn .2s ease}.diagram{background:var(--fill);border-radius:12px;padding:12px 8px;margin:12px 0}.diagram svg{display:block;width:100%;height:auto;max-width:100%}.diagram-cap{font-size:12px;color:var(--secondary);text-align:center;margin-top:8px;line-height:1.35;padding:0 6px}.diagram-label{font-size:13px;font-weight:600;color:var(--secondary);margin:16px 0 6px}.hookup{margin:4px 0 16px;background:var(--fill);border-radius:12px;padding:4px 12px}.hookup-item{display:flex;gap:10px;padding:10px 0;border-bottom:.5px solid var(--separator)}.hookup-item:last-child{border-bottom:none}.hookup-can{flex:0 0 1.75rem;font-weight:700;font-size:15px;padding-top:1px}.hookup-lines{flex:1;min-width:0;font-size:14px;line-height:1.4}.hookup-lines div+div{margin-top:3px}.hookup-lines .hk{display:inline-block;width:2.1rem;color:var(--secondary);font-size:12px;font-weight:600}.hookup .tie{color:var(--blue);font-weight:600}.hookup-note{font-size:13px;color:var(--secondary);line-height:1.35}.steps{margin:12px 0 0;padding-left:1.25rem;font-size:15px;color:var(--label);line-height:1.45}.steps li{margin-bottom:10px;padding-left:4px}.steps li:last-child{margin-bottom:0}.steps-sub{margin:8px 0 0;padding-left:1.1rem;list-style:disc}.steps-sub li{margin-bottom:6px;font-size:14px;color:var(--secondary)}.steps-sub li:last-child{margin-bottom:0}.mnemonic{display:inline-block;font-weight:700;color:var(--label);background:color-mix(in srgb,var(--green) 16%,transparent);padding:2px 8px;border-radius:6px;letter-spacing:.2px}.volt-list{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 12px;font-size:15px;margin:12px 0;padding:14px;background:var(--fill);border-radius:12px}.volt-list .v{font-weight:700;font-variant-numeric:tabular-nums;text-align:right}.volt-list .high{color:var(--red)}.tag{display:inline-block;font-size:12px;font-weight:700;padding:2px 8px;border-radius:6px;margin-right:4px;vertical-align:middle}.tag-a{background:color-mix(in srgb,var(--green) 22%,transparent);color:var(--green)}.tag-b{background:color-mix(in srgb,var(--red) 22%,transparent);color:var(--red)}.tag-c{background:color-mix(in srgb,var(--blue) 22%,transparent);color:var(--blue)}.tab-bar{position:fixed;bottom:0;left:0;right:0;z-index:100;padding-bottom:var(--safe-b);background:var(--tab-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-top:.5px solid var(--separator)}.tab-bar-inner{height:var(--tab-h);max-width:640px;margin:0 auto;display:flex;align-items:stretch}.tab-btn{--tab-topic: var(--blue);flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;border:none;background:transparent;color:var(--tab-inactive);cursor:pointer;padding:4px 2px 2px;min-width:0;transition:color .15s}.tab-btn[data-tab=home]{--tab-topic: var(--topic-plant)}.tab-btn[data-tab=calc]{--tab-topic: var(--topic-fusing)}.tab-btn[data-tab=banks]{--tab-topic: var(--topic-banks)}.tab-btn[data-tab=book]{--tab-topic: var(--topic-meters)}.tab-icon{width:28px;height:28px;border-radius:7px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:transparent;color:inherit}.tab-icon svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.tab-btn.active{color:var(--tab-topic)}.tab-btn.active .tab-icon{background:var(--tab-topic);color:#fff}.tab-btn.active .tab-icon svg{width:16px;height:16px;stroke-width:2}.tab-label{font-size:10px;font-weight:500;letter-spacing:-.1px;line-height:1.1;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tab-btn.active .tab-label{font-weight:600}#pull-refresh{position:fixed;top:calc(var(--safe-t) + var(--nav-h));left:0;width:100%;height:48px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;color:var(--secondary);z-index:90;pointer-events:none;opacity:0;transform:translateY(-100%)}#pull-refresh.visible{opacity:1}.spinner{width:18px;height:18px;border:2px solid var(--secondary);border-top-color:transparent;border-radius:50%;animation:spin .75s linear infinite;margin-right:8px}@keyframes spin{to{transform:rotate(360deg)}}#search-panel{position:fixed;top:calc(var(--safe-t) + var(--nav-h));left:0;right:0;z-index:110;background:var(--nav-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:.5px solid var(--separator);padding:10px 16px 14px}#search-panel[hidden]{display:none}#search-input{width:100%}.search-results{margin-top:10px;display:flex;flex-direction:column;gap:4px;max-height:50vh;overflow-y:auto}.search-results button{text-align:left;border:none;background:var(--card);color:var(--label);border-radius:10px;padding:12px 14px;font-size:15px;font-weight:500;cursor:pointer}.search-empty{font-size:14px;color:var(--secondary);padding:8px 4px}#update-banner{position:fixed;left:12px;right:12px;bottom:calc(var(--safe-b) + var(--tab-h) + 10px);z-index:120;background:var(--card);color:var(--label);border-radius:14px;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;box-shadow:0 8px 24px #0000002e}#update-banner[hidden]{display:none}#update-banner p{font-size:14px;font-weight:600}#update-btn{flex:0 0 auto;border:none;background:var(--blue);color:#fff;font-weight:600;font-size:14px;height:36px;padding:0 14px;border-radius:10px;cursor:pointer}.badge-row{display:flex;justify-content:center;gap:8px;margin-top:10px}.badge{font-size:12px;font-weight:700;padding:4px 8px;border-radius:8px}.badge.ok{background:color-mix(in srgb,var(--green) 18%,transparent);color:var(--green)}.badge.bad{background:color-mix(in srgb,var(--red) 18%,transparent);color:var(--red)}.row-hit td{background:color-mix(in srgb,var(--blue) 14%,transparent);font-weight:700}.source-tag{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.02em;text-transform:uppercase;padding:2px 7px;border-radius:6px;margin-left:6px;vertical-align:middle}.source-tag.company{background:color-mix(in srgb,var(--orange) 18%,transparent);color:var(--orange)}.source-tag.nesc{background:color-mix(in srgb,var(--blue) 18%,transparent);color:var(--blue)}.source-tag.osha{background:color-mix(in srgb,var(--red) 16%,transparent);color:var(--red)}.disclaimer{font-size:13px;color:var(--secondary);line-height:1.4;margin:0 4px 16px}.preset-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.val.high{color:var(--red)}.chips{padding-bottom:6px}.chip{min-height:36px}.mt-0{margin-top:0}.mb-0{margin-bottom:0}.gap-sm{margin-top:10px}.divider{height:.5px;background:var(--separator);margin:16px 0}.rev-stamp{position:absolute;left:16px;top:50%;transform:translateY(-50%);font-size:11px;font-weight:600;color:var(--tertiary);letter-spacing:.02em}.home-search{margin-bottom:10px}.home-live{margin-bottom:8px}.home-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.home-card{display:flex;flex-direction:row;align-items:flex-start;gap:10px;padding:12px 14px;border:none;border-radius:14px;background:var(--card);color:var(--label);text-align:left;cursor:pointer}.home-card-icon{width:28px;height:28px;border-radius:7px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff}.home-card-icon svg{width:16px;height:16px;display:block}.home-card-text{display:flex;align-items:flex-start;gap:4px;min-width:0;flex:1}.home-card-title{font-size:16px;font-weight:600;letter-spacing:-.3px;min-width:0}.home-card-fav{flex-shrink:0;color:var(--orange);font-size:13px;line-height:1.25}.home-live button{display:flex;align-items:center;gap:10px}.home-live .home-card-icon{width:28px;height:28px}.volt-chips{flex-wrap:wrap;overflow:visible;margin:8px 0 0;padding:0;gap:6px}.volt-chips .chip{height:32px;min-height:32px;padding:0 10px;font-size:13px}.install-banner{display:flex;flex-direction:column;align-items:flex-start;gap:4px;width:100%;margin:0 0 18px;padding:14px 16px;border:none;border-radius:14px;background:color-mix(in srgb,var(--blue) 14%,transparent);color:var(--label);text-align:left;cursor:pointer}.install-banner strong{font-size:16px}.install-banner span{font-size:13px;color:var(--secondary)}.has-fav{position:relative}.group.has-fav .group-body{padding-right:44px}.fav-btn{position:absolute;top:8px;right:8px;z-index:2;width:36px;height:36px;border:none;border-radius:10px;background:var(--fill);color:var(--secondary);font-size:18px;line-height:1;cursor:pointer}.fav-btn.active{color:var(--orange)}.book-filters{margin-top:4px}.fusing-title{font-size:22px;margin-top:28px}.source-tag.field-tag{background:color-mix(in srgb,var(--secondary) 18%,transparent);color:var(--secondary)}.plate-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:12px}.plate-btn{border:none;border-radius:10px;background:var(--blue);color:#fff;font-size:14px;font-weight:600;min-height:36px;padding:0 12px;cursor:pointer}.plate-btn:nth-child(n+2){background:var(--fill);color:var(--label)}.warn-line{color:var(--red);font-weight:600}