.et555{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:#10201d;background:#fff;border:1px solid #dbe7e4;border-radius:18px;box-shadow:0 10px 30px rgba(2,38,32,.08);overflow:hidden;margin:24px 0}.et555 *{box-sizing:border-box}.et555-hero{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:28px;background:linear-gradient(135deg,var(--et555-accent),#073b36);color:#fff}.et555-brand{font-weight:700;opacity:.9;text-transform:uppercase;letter-spacing:.08em;font-size:12px}.et555-hero h2{margin:6px 0 8px;color:#fff;font-size:30px;line-height:1.15}.et555-hero p{margin:0;max-width:820px;color:#eafffb}.et555-version{background:rgba(255,255,255,.15);padding:12px 14px;border-radius:12px;text-align:center;white-space:nowrap;font-weight:700}.et555-version span{font-size:12px;font-weight:500}.et555-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;padding:16px;background:#f3faf8}.et555-tab{border:1px solid #d8ebe7;border-radius:14px;padding:13px;text-align:left;background:#fff;cursor:pointer;transition:.2s}.et555-tab strong{display:block;color:#123b36}.et555-tab span{font-size:12px;color:#5f706c}.et555-tab.active,.et555-tab:hover{border-color:var(--et555-accent);box-shadow:0 0 0 3px rgba(15,118,110,.12)}.et555-grid{display:grid;grid-template-columns:minmax(280px,420px) 1fr;gap:20px;padding:20px}.et555-panel,.et555-results,.et555-diagram,.et555-seo-content,.et555-faq{border:1px solid #e0ebe8;border-radius:16px;padding:18px;background:#fff}.et555-mode-note{background:#eefaf7;border-left:4px solid var(--et555-accent);padding:13px;border-radius:12px;margin-bottom:15px}.et555-inputs{display:grid;gap:12px}.et555-field label{display:flex;justify-content:space-between;align-items:center;font-weight:700;margin-bottom:6px}.et555-field input,.et555-field select{width:100%;min-height:48px;padding:12px;border:1px solid #cbdad7;border-radius:10px;font-size:16px;line-height:1.35;background:#fff}.et555-field select{height:48px;padding:10px 34px 10px 12px;appearance:auto;-webkit-appearance:menulist;display:block;color:#10201d}.et555-help{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#e6f3f0;color:#123b36;font-size:13px;cursor:pointer;border:none}.et555-tip{display:none;position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index:99999;background:#fff;border:1px solid #d9e5e2;border-radius:14px;box-shadow:0 20px 60px rgba(0,0,0,.22);max-width:420px;width:calc(100% - 40px);padding:20px;text-align:center}.et555-tip.open{display:block}.et555-tip button{margin-top:14px;background:var(--et555-accent);color:#fff;border:0;border-radius:8px;padding:8px 16px}.et555-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.et555-primary,.et555-secondary{border:0;border-radius:10px;padding:12px 15px;font-weight:800;cursor:pointer}.et555-primary{background:var(--et555-accent);color:#fff}.et555-secondary{background:#eaf3f0;color:#0d3f39}.et555-result-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:12px}.et555-card{background:#f8fcfb;border:1px solid #dce9e6;border-radius:14px;padding:14px}.et555-card span{display:block;color:#60736f;font-size:12px}.et555-card strong{font-size:20px;color:#0b3d37}.et555-wave-wrap{margin-top:18px}.et555-wave-wrap canvas{width:100%;height:auto;border:1px solid #e0ebe8;border-radius:14px;background:#fbfefd}.et555-warnings,.et555-parts{margin-top:15px}.et555-warnings ul,.et555-parts ul{margin:.5em 0 0 1.2em}.et555-warnings{background:#fff8e6;border:1px solid #f0d58a;border-radius:12px;padding:12px}.et555-parts{background:#eefaf7;border:1px solid #bce3da;border-radius:12px;padding:12px}.et555-formula{margin-top:15px;background:#f8fcfb;border:1px solid #e0ebe8;padding:12px;border-radius:12px}.et555-diagram{margin:0 20px 20px}.et555-pin-guide{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.et555-pin{background:#f8fcfb;border:1px dashed #c6d8d4;border-radius:12px;padding:11px}.et555-seo-content,.et555-faq{margin:20px}.et555-faq details{border:1px solid #e0ebe8;border-radius:10px;padding:12px;margin-bottom:10px}.et555-footer{text-align:center;padding:16px;background:#f3faf8;color:#45625d}.et555-badge{display:inline-block;background:#e6f3f0;border-radius:999px;padding:4px 9px;font-size:12px;margin-right:5px}.et555-hidden{display:none!important}@media(max-width:780px){.et555-grid{grid-template-columns:1fr}.et555-hero{display:block}.et555-version{display:inline-block;margin-top:12px}.et555-hero h2{font-size:24px}.et555-tabs{grid-template-columns:1fr}.et555-diagram,.et555-seo-content,.et555-faq{margin:14px}}


/* v1.0.2 UI and engineering-unit patch */
.et555-tab.active{background:var(--et555-accent);border-color:var(--et555-accent);box-shadow:0 8px 22px rgba(15,118,110,.20);}
.et555-tab.active strong,.et555-tab.active span{color:#fff;}
.et555-tab:hover:not(.active){background:#f8fffd;}
.et555-help{display:inline-flex;align-items:center;justify-content:center;line-height:1;text-align:center;font-weight:800;padding:0;min-width:22px;flex:0 0 22px;}
.et555-tip{padding:24px 22px 20px;}
.et555-tip .et555-tip-close{position:absolute;right:10px;top:8px;margin:0;width:30px;height:30px;border-radius:999px;padding:0;display:inline-flex;align-items:center;justify-content:center;font-size:20px;line-height:1;background:#eefaf7;color:#123b36;border:1px solid #cce2dd;}
.et555-tip .et555-tip-close:hover{background:var(--et555-accent);color:#fff;}
.et555-tip .et555-tip-ok{margin-top:16px;background:var(--et555-accent);color:#fff;border:0;border-radius:8px;padding:9px 18px;font-weight:800;}
.et555-realtime-note{background:#f0fbf8;border:1px solid #c8e8df;color:#123b36;border-radius:12px;padding:11px 13px;margin-bottom:14px;font-size:14px;font-weight:700;}

/* v1.0.3 result-side unit converter patch */
.et555-result-row{display:grid;grid-template-columns:minmax(0,1fr) 92px;gap:8px;align-items:center;margin-top:4px;}
.et555-card .et555-result-row strong{font-size:19px;line-height:1.25;word-break:break-word;}
.et555-result-unit{width:100%;min-height:42px;height:42px;border:1px solid #cbdad7;border-radius:10px;background:#fff;color:#10201d;font-size:14px;line-height:1.3;padding:8px 26px 8px 9px;appearance:auto;-webkit-appearance:menulist;}
.et555-card-convertible{padding-bottom:12px;}
@media(max-width:480px){.et555-result-row{grid-template-columns:1fr;}.et555-result-unit{max-width:160px;}}

/* v1.0.4 improved result display layout */
.et555-result-cards{grid-template-columns:repeat(auto-fit,minmax(175px,1fr));}
.et555-card{display:flex;flex-direction:column;gap:6px;min-height:112px;}
.et555-result-row{display:flex;flex-direction:column;align-items:flex-start;gap:9px;margin-top:2px;width:100%;}
.et555-card .et555-result-row strong{display:block;width:100%;font-size:18px;line-height:1.15;letter-spacing:-.01em;word-break:normal;overflow-wrap:anywhere;}
.et555-result-unit{width:100%;max-width:135px;min-height:38px;height:38px;border:1px solid #cbdad7;border-radius:10px;background:#fff;color:#10201d;font-size:13px;line-height:1.25;padding:7px 26px 7px 9px;appearance:auto;-webkit-appearance:menulist;}
.et555-card-convertible::after{content:'Convert unit';display:block;margin-top:auto;color:#6a7c78;font-size:11px;line-height:1;}

@media(max-width:480px){.et555-result-cards{grid-template-columns:1fr 1fr;}.et555-card .et555-result-row strong{font-size:17px}.et555-result-unit{max-width:125px;min-height:36px;height:36px;}}
@media(max-width:360px){.et555-result-cards{grid-template-columns:1fr;}.et555-result-unit{max-width:150px;}}


/* v1.0.5 readable result unit selector patch */
.et555-card .et555-result-row strong{
  font-size:18px;
  line-height:1.18;
}
.et555-result-unit{
  font-size:15px;
  font-weight:600;
  min-height:40px;
  height:40px;
  max-width:145px;
  padding:8px 28px 8px 10px;
}
.et555-card-convertible::after{
  font-size:11.5px;
  margin-top:1px;
}
@media(max-width:480px){
  .et555-card .et555-result-row strong{font-size:17px;}
  .et555-result-unit{font-size:14px;max-width:138px;min-height:38px;height:38px;}
}
@media(max-width:360px){
  .et555-result-unit{max-width:150px;}
}

/* v1.1.0 responsive mode schematic diagrams */
.et555-schematic-card{margin-top:16px;border:1px solid #e0ebe8;border-radius:16px;background:#fbfefd;padding:14px;}
.et555-schematic-card h3{margin:0 0 10px;font-size:17px;color:#123b36;}
.et555-schematic-wrap{display:flex;justify-content:center;align-items:center;min-height:220px;overflow:hidden;}
.et555-schematic-svg{width:100%;max-width:520px;height:auto;display:block;background:#fff;border:1px solid #dce9e6;border-radius:14px;box-shadow:0 6px 18px rgba(2,38,32,.06);}
.et555-schematic-svg text{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;fill:#123b36;font-size:13px;font-weight:650;}
.et555-schematic-svg .et555-wire{stroke:#123b36;stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round;}
.et555-schematic-svg .et555-thin{stroke:#58736e;stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round;}
.et555-schematic-svg .et555-chip{fill:#f3faf8;stroke:#0f766e;stroke-width:3;}
.et555-schematic-svg .et555-comp{stroke:#0f766e;stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round;}
.et555-schematic-svg .et555-node{fill:#0f766e;}
.et555-schematic-svg .et555-title{font-size:17px;font-weight:800;fill:#0b3d37;}
.et555-schematic-svg .et555-small{font-size:11px;font-weight:600;fill:#55706b;}
@media(max-width:780px){.et555-schematic-wrap{min-height:180px}.et555-schematic-svg{max-width:100%;}.et555-schematic-svg text{font-size:12px}.et555-schematic-svg .et555-title{font-size:15px}}

.et555-formula summary{cursor:pointer;font-weight:800;color:#0d3f39;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:10px}.et555-formula summary::-webkit-details-marker{display:none}.et555-formula summary:after{content:'+';display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#e6f3f0;color:#0d3f39;font-weight:900}.et555-formula[open] summary:after{content:'−'}.et555-formula[open]{background:linear-gradient(180deg,#f8fcfb,#ffffff);box-shadow:0 8px 22px rgba(2,38,32,.05)}#et555Formula{margin-top:14px;border-top:1px solid #e0ebe8;padding-top:14px;overflow-x:auto}.et555-math-title{font-weight:800;color:#0d3f39;margin-bottom:10px;text-align:center}.et555-math-line{background:#ffffff;border:1px solid #e0ebe8;border-radius:12px;margin:10px 0;padding:10px 12px;overflow-x:auto;text-align:center}.et555-math-note{margin:10px 0 0;color:#506b66;font-size:14px;line-height:1.5;text-align:center}.et555-formula mjx-container{font-size:112%!important;max-width:100%;overflow-x:auto;overflow-y:hidden}
@media(max-width:780px){.et555-formula mjx-container{font-size:100%!important}.et555-math-line{padding:9px 8px}}

/* v1.1.3 user supplied schematic images */
.et555-schematic-figure{margin:0;width:100%;text-align:center;}
.et555-schematic-img{display:block;width:100%;max-width:620px;height:auto;margin:0 auto;border:1px solid #dce9e6;border-radius:14px;background:#fff;box-shadow:0 6px 18px rgba(2,38,32,.06);object-fit:contain;}
.et555-schematic-figure figcaption{margin-top:8px;font-size:13px;font-weight:700;color:#45625d;}
@media(max-width:780px){.et555-schematic-img{max-width:100%;}.et555-schematic-figure figcaption{font-size:12px;}}