.etvdc-wrap{--et-blue:#0f66ff;--et-blue2:#00a6ff;--et-ink:#102033;--et-muted:#627086;--et-bg:#f3f8ff;--et-card:#ffffff;--et-line:#d7e4f5;--et-soft:#eaf4ff;--et-good:#0f9f6e;--et-warn:#cf7a00;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--et-ink);max-width:1120px;margin:28px auto;padding:0 14px;box-sizing:border-box}.etvdc-wrap *{box-sizing:border-box}.etvdc-hero{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:28px;border-radius:26px;background:linear-gradient(135deg,#f8fcff 0%,#e8f4ff 55%,#dff0ff 100%);border:1px solid var(--et-line);box-shadow:0 18px 45px rgba(13,91,183,.12);position:relative;overflow:hidden}.etvdc-hero:after{content:"";position:absolute;right:-80px;top:-80px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,rgba(15,102,255,.25),transparent 65%)}.etvdc-kicker{margin:0 0 6px;text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:800;color:var(--et-blue)}.etvdc-hero h2{margin:0 0 8px;font-size:clamp(28px,4vw,46px);line-height:1.05;color:#071a35}.etvdc-subtitle{margin:0;font-size:16px;color:var(--et-muted);max-width:720px}.etvdc-badge{z-index:1;white-space:nowrap;background:#fff;color:var(--et-blue);font-weight:800;border:1px solid #cfe4ff;padding:12px 16px;border-radius:999px;box-shadow:0 10px 25px rgba(15,102,255,.12)}.etvdc-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(330px,.9fr);gap:18px;margin-top:18px}.etvdc-card,.etvdc-info-card{background:var(--et-card);border:1px solid var(--et-line);border-radius:22px;box-shadow:0 14px 35px rgba(21,57,112,.08);padding:22px}.etvdc-section-title{display:flex;align-items:center;gap:10px;margin-bottom:18px}.etvdc-section-title span{display:grid;place-items:center;width:32px;height:32px;border-radius:12px;background:linear-gradient(135deg,var(--et-blue),var(--et-blue2));color:#fff;font-weight:900}.etvdc-section-title h3{margin:0;font-size:20px;color:#102033}.etvdc-field{display:block;margin-bottom:14px}.etvdc-field>span{display:block;font-size:14px;font-weight:800;margin-bottom:7px;color:#24364d}.etvdc-tip{display:inline-grid;place-items:center;width:18px;height:18px;border-radius:50%;background:#e7f2ff;color:var(--et-blue);font-style:normal;font-size:12px;cursor:help}.etvdc-unit-row{display:grid;grid-template-columns:1fr 92px;border:1px solid #c9daf0;border-radius:14px;overflow:hidden;background:#fff;transition:.2s}.etvdc-unit-row:focus-within{border-color:var(--et-blue);box-shadow:0 0 0 4px rgba(15,102,255,.11)}.etvdc-input,.etvdc-unit,.etvdc-calc-for,.etvdc-series,.etvdc-safety{font:inherit;border:0;outline:0;background:#fff;color:#13263c}.etvdc-input{padding:13px 14px;min-width:0}.etvdc-unit{border-left:1px solid #d8e4f4;padding:0 8px;font-weight:700;background:#f8fbff}.etvdc-select-field select,.etvdc-options select{width:100%;border:1px solid #c9daf0;border-radius:14px;padding:13px 14px;font-weight:700;background:#fff}.etvdc-two-col{display:grid;grid-template-columns:1fr 1fr;gap:12px}.etvdc-field.etvdc-target{opacity:.68}.etvdc-field.etvdc-target .etvdc-unit-row{background:#f4f8fd}.etvdc-field.etvdc-target input{background:#f4f8fd;color:#607084}.etvdc-field.etvdc-target:after{content:"This value will be calculated";display:block;margin-top:5px;color:var(--et-blue);font-size:12px;font-weight:800}.etvdc-options{border:1px solid #dbe8f8;border-radius:16px;padding:12px 14px;margin:10px 0 16px;background:#fbfdff}.etvdc-options summary{cursor:pointer;font-weight:900;color:#163b73}.etvdc-options .etvdc-two-col{margin-top:12px}.etvdc-actions,.etvdc-result-actions{display:flex;gap:10px;flex-wrap:wrap}.etvdc-btn{border:0;border-radius:14px;padding:12px 17px;font-weight:900;cursor:pointer;background:#edf5ff;color:#144b92;transition:transform .15s,box-shadow .15s,background .15s}.etvdc-btn:hover{transform:translateY(-1px);box-shadow:0 10px 18px rgba(15,102,255,.13)}.etvdc-primary{background:linear-gradient(135deg,var(--et-blue),var(--et-blue2));color:#fff}.etvdc-message{margin-top:12px;font-size:14px;font-weight:750;color:#b45309}.etvdc-message.etvdc-ok{color:var(--et-good)}.etvdc-schematic{background:linear-gradient(180deg,#f8fcff,#eef7ff);border:1px solid #d8e8f8;border-radius:18px;padding:8px;overflow:hidden}.etvdc-schematic svg{width:100%;height:auto;display:block}.etvdc-svg-title{font-size:24px;font-weight:900;fill:#0b2343}.etvdc-svg-label{font-size:25px;font-weight:900;fill:#0d3470}.etvdc-wire{stroke:url(#etvdc-wire);stroke-width:7;stroke-linecap:round;fill:none}.etvdc-resistor{stroke:#0f66ff;stroke-width:7;stroke-linejoin:round;stroke-linecap:round;fill:none}.etvdc-node{fill:#fff;stroke:#0f66ff;stroke-width:6}.etvdc-ground{stroke:#0b2343;stroke-width:6;stroke-linecap:round}.etvdc-formula-box{margin-top:14px;padding:16px;border-radius:16px;background:#f1f7ff;border:1px solid #d8e8f8}.etvdc-equation{font-size:19px;font-weight:900;color:#0b3475;margin-bottom:8px}.etvdc-formula-box p{margin:0;color:var(--et-muted)}.etvdc-results{margin-top:18px}.etvdc-result-placeholder{border:1px dashed #b8cbe3;border-radius:16px;padding:18px;color:#5f7188;background:#fbfdff}.etvdc-result-main{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px;border-radius:18px;background:linear-gradient(135deg,#0f66ff,#00a6ff);color:#fff;margin-bottom:14px}.etvdc-result-label{font-weight:800;opacity:.94}.etvdc-result-value{font-size:clamp(24px,4vw,38px);line-height:1;text-align:right}.etvdc-result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.etvdc-result-grid div{padding:14px;border:1px solid #dbe8f8;border-radius:16px;background:#fbfdff}.etvdc-result-grid span{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:#68788d;font-weight:900;margin-bottom:5px}.etvdc-result-grid strong{font-size:17px;color:#102033}.etvdc-suggestion{margin:14px 0;padding:16px;border-radius:16px;background:#fff7ed;border:1px solid #fed7aa;color:#7c3d00;font-weight:750}.etvdc-suggestion strong{color:#9a3412}.etvdc-info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:18px}.etvdc-info-card h3{margin:0 0 8px;font-size:18px}.etvdc-info-card p{margin:0;color:var(--et-muted);line-height:1.65}@media(max-width:860px){.etvdc-grid,.etvdc-info-grid{grid-template-columns:1fr}.etvdc-hero{display:block}.etvdc-badge{display:inline-block;margin-top:14px}.etvdc-result-grid{grid-template-columns:1fr 1fr}}@media(max-width:560px){.etvdc-wrap{padding:0 8px}.etvdc-hero,.etvdc-card,.etvdc-info-card{padding:18px;border-radius:18px}.etvdc-two-col,.etvdc-result-grid{grid-template-columns:1fr}.etvdc-unit-row{grid-template-columns:1fr 82px}.etvdc-result-main{display:block}.etvdc-result-value{display:block;text-align:left;margin-top:8px}.etvdc-svg-label{font-size:22px}.etvdc-actions .etvdc-btn,.etvdc-result-actions .etvdc-btn{width:100%}}

/* v4 corrections: clean one-column layout, fixed dropdown vertical alignment, removed schematic layout spacing */
.etvdc-grid{grid-template-columns:1fr;max-width:820px;margin-left:auto;margin-right:auto}.etvdc-input-card{width:100%}.etvdc-select-field select,.etvdc-options select,.etvdc-unit{min-height:48px;height:48px;line-height:1.25;padding-top:0!important;padding-bottom:0!important;display:block;vertical-align:middle;appearance:auto;-webkit-appearance:auto}.etvdc-calc-for,.etvdc-series,.etvdc-safety{line-height:48px}.etvdc-unit-row{align-items:stretch}.etvdc-unit-row select{height:auto;min-height:48px}.etvdc-results{max-width:820px;margin-left:auto;margin-right:auto}.etvdc-info-grid{max-width:1120px;margin-left:auto;margin-right:auto}
@media(max-width:560px){.etvdc-select-field select,.etvdc-options select,.etvdc-unit{min-height:46px;height:46px;line-height:1.25}.etvdc-calc-for,.etvdc-series,.etvdc-safety{line-height:46px}}

/* v5: restored clean voltage divider diagram image */
.etvdc-diagram-card{max-width:820px;margin:0 auto;width:100%}
.etvdc-diagram-box{display:flex;justify-content:center;align-items:center;background:#fff;border:1px solid #dbe8f8;border-radius:18px;padding:18px;min-height:280px}
.etvdc-diagram-box img{display:block;width:auto;max-width:100%;max-height:430px;height:auto;object-fit:contain}
.etvdc-diagram-note{margin:14px 0 0;padding:14px 16px;border-radius:14px;background:#f1f7ff;border:1px solid #d8e8f8;color:#334761;line-height:1.6}
@media(max-width:560px){.etvdc-diagram-box{padding:12px;min-height:220px}.etvdc-diagram-box img{max-height:340px}}

/* v6 editable backend dashboard support */
.etvdc-footer-note{max-width:1120px;margin:18px auto 0;padding:14px 16px;border-radius:14px;background:#f1f7ff;border:1px solid #d8e8f8;color:#173a66;font-weight:700;line-height:1.55}