:root {
    color-scheme: only light;
    --page-background: #f4f7f9;
    --surface: #ffffff;
    --surface-soft: #eef6ff;
    --text: #15263d;
    --heading: #102a56;
    --label: #263b55;
    --muted: #53657a;
    --border: #dce4e8;
    --input-border: #cbd6dc;
    --divider: rgba(21, 38, 61, 0.10);
    --divider-soft: rgba(21, 38, 61, 0.08);
    --primary: #0b8f7c;
    --primary-hover: #087565;
    --primary-contrast: #ffffff;
    --primary-focus: rgba(11, 143, 124, 0.15);
    --result-accent: #087a64;
    --disabled-background: #eef1f4;
    --disabled-text: #7a8790;
    --disabled-border: #d5dde2;
    --shadow: 0 6px 24px rgba(21, 38, 61, 0.06);
    --success-background: #e5f6ee;
    --success-text: #087a4b;
    --error-background: #fdeaea;
    --error-text: #b42318;
    --warning-background: #fff3d6;
    --warning-text: #9a6700;
    --info-border: #4f86c6;
    --info-text: #3273b9;
    --disclaimer-background: #fff9e8;
    --disclaimer-border: rgba(208, 151, 16, 0.22);
    --disclaimer-heading: #102a56;
    --disclaimer-heading-text: #ffffff;
    --warning-icon: #d97706;
}

html[data-theme="workshop"] {
    color-scheme: only light;
    --page-background: #168fc5;
    --surface: #f8fcfe;
    --surface-soft: #e1f4fb;
    --text: #172632;
    --heading: #173242;
    --label: #294453;
    --muted: #526b78;
    --border: #9bc8da;
    --input-border: #88b7ca;
    --divider: rgba(16, 86, 119, 0.16);
    --divider-soft: rgba(16, 86, 119, 0.11);
    --primary: #ffc400;
    --primary-hover: #e5ad00;
    --primary-contrast: #172632;
    --primary-focus: rgba(242, 164, 0, 0.24);
    --result-accent: #b96100;
    --disabled-background: #e5edf1;
    --disabled-text: #71838d;
    --disabled-border: #c8d5dc;
    --shadow: 0 10px 30px rgba(6, 54, 79, 0.22);
    --info-border: #087fba;
    --info-text: #056a9c;
    --disclaimer-background: #fff6dc;
    --disclaimer-border: rgba(224, 146, 0, 0.30);
    --disclaimer-heading: #202a32;
    --warning-icon: #e38b00;
}

html[data-theme="workshop"] body {
    background-image: linear-gradient(
        135deg,
        #0875aa 0%,
        #20a9e2 55%,
        #086d9e 100%
    );
    background-attachment: fixed;
}

html[data-theme="workshop"] .page-title h1,
html[data-theme="workshop"] .theme-control label {
    color: #ffffff;
}

html[data-theme="dark"] {
    color-scheme: dark;
    --page-background: #101820;
    --surface: #1a252e;
    --surface-soft: #172d3a;
    --text: #e7eef2;
    --heading: #f0f4f6;
    --label: #c5d1d8;
    --muted: #9fb0ba;
    --border: #334652;
    --input-border: #48606d;
    --divider: rgba(211, 227, 235, 0.16);
    --divider-soft: rgba(211, 227, 235, 0.10);
    --primary: #1685ad;
    --primary-hover: #1d9bc7;
    --primary-focus: rgba(49, 171, 215, 0.24);
    --result-accent: #57c5e8;
    --disabled-background: #26333c;
    --disabled-text: #798993;
    --disabled-border: #394a54;
    --shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
    --success-background: #17392e;
    --success-text: #75d9ae;
    --error-background: #442426;
    --error-text: #ff9d98;
    --warning-background: #40351f;
    --warning-text: #f3c96d;
    --info-border: #4ba6ca;
    --info-text: #78c8e7;
    --disclaimer-background: #282a25;
    --disclaimer-border: rgba(238, 184, 52, 0.35);
    --disclaimer-heading: #293842;
    --disclaimer-heading-text: #f4f7f9;
    --warning-icon: #f0ad32;
}

input:disabled,
select:disabled {
    background-color: var(--disabled-background);
    color: var(--disabled-text);
    border-color: var(--disabled-border);
    cursor: not-allowed;
}

.status-success,
.status-error,
.status-warning {
    display: inline-block;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    font-weight: 600;
}

.status-success {
    background-color: var(--success-background);
    color: var(--success-text);
}

.status-error {
    background-color: var(--error-background);
    color: var(--error-text);
}

.status-warning {
    background-color: var(--warning-background);
    color: var(--warning-text);
}

body {
    margin: 0;
    padding: 2rem;
    background-color: var(--page-background);
    color: var(--text);
    font-family:
        Inter,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

.page-title {
    display: flex;
    align-items: center;
    gap: 0;
    max-width: 1400px;
    margin: 0 auto 1.5rem;
}

.page-title h1 {
    margin: 0;
}

.theme-control {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-left: auto;
}

.theme-control label {
    margin: 0;
    color: var(--muted);
    font-size: 0.8rem;
}

.theme-control select {
    width: auto;
    min-width: 8.5rem;
    height: 2.35rem;
    padding: 0 2rem 0 0.7rem;
    font-size: 0.875rem;
}

.page-title-icon {
    width: 5rem;
    height: 5rem;
    flex: 0 0 5rem;
    margin-right: -0.55rem;
    object-fit: contain;
}

.calculator-layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr);
    gap: 1.25rem;
    max-width: 1400px;
    margin: 0 auto;
    align-items: start;
}

#circuit-form,
#result-panel {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

#result-panel {
    padding: 0;
    position: sticky;
    top: 1rem;
}

#result-panel>h2 {
    margin: 0;
    padding: 1.25rem 1.5rem;
    color: var(--heading);
    font-size: 1.2rem;
    line-height: normal;
}

#result-status,
#result-values,
#result-error {
    margin-left: 1.5rem;
    margin-right: 1.5rem;
}

#result-status {
    margin-top: 0;
}

fieldset {
    margin: 0;
    padding:
        0 1.5rem 1.5rem;
    border: 0;
    border-bottom: 1px solid var(--border);
}

legend {
    width: 100%;
    margin-bottom: 1rem;
    padding: 0;
    color: var(--heading);
    font-size: 1.2rem;
    font-weight: 700;
}

label {
    display: block;
    margin: 0.8rem 0 0.35rem;
    color: var(--label);
    font-size: 0.875rem;
    font-weight: 600;
}

input,
select {
    width: 100%;
    height: 2.75rem;
    padding: 0 0.8rem;
    border: 1px solid var(--input-border);
    border-radius: 7px;
    background-color: var(--surface);
    color: var(--text);
    font: inherit;
    box-sizing: border-box;
}

input:focus,
select:focus {
    border-color: var(--primary);
    outline: 3px solid var(--primary-focus);
}

button[type="submit"] {
    width: calc(100% - 3rem);
    margin: 1.5rem;
    padding: 0.9rem 1rem;
    border: 0;
    border-radius: 7px;
    background-color: var(--primary);
    color: var(--primary-contrast);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

@media (hover: hover) and (pointer: fine) {
    button[type="submit"]:hover {
        background-color: var(--primary-hover);
    }
}

button[type="submit"]:active {
    background-color: var(--primary-hover);
}

.field-grid {
    display: grid;
    grid-template-columns:
        repeat(auto-fit, minmax(210px, 1fr));
    gap: 1rem;
}

.form-field label {
    margin-top: 0;
}

@media (max-width: 1000px) {
    body {
        padding: 1rem;
    }

    .calculator-layout {
        grid-template-columns: 1fr;
    }

    #result-panel {
        position: static;
    }
}

@media (max-width: 600px) {
    body {
        padding: 0.75rem;
    }

    .page-title {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
    }

    .page-title h1 {
        font-size: 1.6rem;
        line-height: 1.15;
    }

    .theme-control {
        grid-column: 1 / -1;
        justify-content: flex-end;
        margin-top: 0.35rem;
        margin-left: 0;
    }

    fieldset {
        padding: 1rem;
    }

    .field-grid {
        grid-template-columns: 1fr;
    }

    button[type="submit"] {
        width: calc(100% - 2rem);
        margin: 1rem;
    }
}

.form-section {
    border-bottom:
        1px solid var(--divider);
}

.form-section summary {
    padding: 1.25rem 1.5rem;
    color: var(--heading);
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
}

.form-section fieldset {
    padding: 0 1.5rem 1.5rem;
    border: 0;
}

.form-section summary:hover {
    background-color: var(--primary-focus);
}

#circuit-results,
#cross-section-results,
#protection-results {
    margin: 0.75rem 0 0;
}

#circuit-results>div,
#cross-section-results>div,
#protection-results>div {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: baseline;
    padding: 0.55rem 0;
    border-bottom:
        1px solid var(--divider-soft);
}

#protection-results>div[hidden] {
    display: none;
}

#protection-results>div {
    border-bottom: 0;
}

#circuit-results>div:last-child,
#cross-section-results>div:last-child,
#protection-results>div:last-child {
    border-bottom: 0;
}

#circuit-results dt,
#circuit-results dd,
#cross-section-results dt,
#cross-section-results dd,
#protection-results dt,
#protection-results dd {
    margin: 0;
}

#circuit-results dt,
#cross-section-results dt,
#protection-results dt {
    color: var(--muted);
}

#circuit-results dd,
#cross-section-results dd,
#protection-results dd {
    color: var(--text);
    font-weight: 700;
    text-align: right;
}

.headline-result {
    padding: 0.9rem 0;
    border-bottom:
        1px solid var(--divider);
}

.headline-result-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: baseline;
}

.headline-result-row>span {
    color: var(--muted);
    font-weight: 600;
}

.headline-result-row>strong {
    color: var(--result-accent);
    font-size: 1.75rem;
    text-align: right;
}

.result-details summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 0;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
}

.result-details summary::-webkit-details-marker {
    display: none;
}

.result-details summary::after {
    content: "i";
    display: grid;
    place-items: center;
    width: 1.0rem;
    height: 1.0rem;
    flex: 0 0 1.0rem;
    border: 1px solid var(--info-border);
    border-radius: 50%;
    color: var(--info-text);
    background-color: var(--surface-soft);
    font-family: Georgia, serif;
    font-size: 0.65rem;
    font-weight: 700;
    line-height: 1;
}

.calculator-disclaimer {
    box-sizing: border-box;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto 1rem;
    overflow: hidden;
    background: var(--disclaimer-background);
    border: 1px solid var(--disclaimer-border);
    border-radius: 0.75rem;
    color: var(--muted);
}

.disclaimer-heading {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.55rem 1rem;
    background: var(--disclaimer-heading);
    color: var(--disclaimer-heading-text);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.disclaimer-icon {
    display: grid;
    width: 1.25rem;
    height: 1.25rem;
    place-items: center;
    flex: 0 0 auto;
    border-radius: 50%;
    background: #f2b824;
    color: #102a56;
    font-weight: 800;
}

.calculator-disclaimer p {
    margin: 0;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
}

@media (max-width: 768px) {
    input,
    select {
        font-size: 18px;
    }
}

.result-data-warning {
    margin: 1rem 0 1.25rem;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.5;
}

.result-data-warning:not([hidden]) {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.result-warning-icon {
    flex: 0 0 auto;
    color: var(--warning-icon);
    font-family: Arial, sans-serif;
    font-size: 1.05rem;
    line-height: 1.3;
}