.hie-calculator,
.hie-calculator * {
    box-sizing: border-box;
}

.hie-calculator {
    --hie-bg: #f6f7f9;
    --hie-panel: #ffffff;
    --hie-text: #172033;
    --hie-muted: #5f6b7a;
    --hie-border: #d9dee7;
    --hie-soft: #eef1f6;
    --hie-primary: #2b3445;
    --hie-primary-hover: #111827;
    --hie-focus: #4f6f9f;
    --hie-danger: #9f2b2b;
    --hie-danger-bg: #fff1f1;
    --hie-shadow: 0 18px 45px rgba(20, 31, 48, 0.08);
    width: 100%;
    max-width: 920px;
    margin: 24px auto;
    padding: clamp(12px, 3vw, 20px);
    color: var(--hie-text);
    background: var(--hie-bg);
    border-radius: 24px;
    font-family: inherit;
    overflow: hidden;
}

.hie-calculator.hie-dark {
    --hie-bg: #111722;
    --hie-panel: #182132;
    --hie-text: #f8fafc;
    --hie-muted: #bac4d2;
    --hie-border: #344158;
    --hie-soft: #223047;
    --hie-primary: #f8fafc;
    --hie-primary-hover: #dbe3ef;
    --hie-focus: #9db9ff;
    --hie-danger: #ffb4b4;
    --hie-danger-bg: #3a1d24;
    --hie-shadow: 0 18px 45px rgba(0, 0, 0, 0.24);
}

.hie-panel {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    margin: 0 0 16px;
    padding: clamp(18px, 4vw, 28px);
    background: var(--hie-panel);
    border: 1px solid var(--hie-border);
    border-radius: 20px;
    box-shadow: var(--hie-shadow);
}

.hie-panel:last-child {
    margin-bottom: 0;
}

.hie-heading-row {
    display: flex;
    flex-direction: column;
    gap: 14px;
    align-items: flex-start;
    justify-content: space-between;
}

.hie-calculator h2,
.hie-calculator h3 {
    margin: 0;
    color: var(--hie-text);
    font-weight: 750;
    line-height: 1.15;
    overflow-wrap: anywhere;
}

.hie-calculator h2 {
    font-size: clamp(1.45rem, 5vw, 2.2rem);
}

.hie-calculator h3 {
    font-size: clamp(1.2rem, 4vw, 1.65rem);
}

.hie-eyebrow {
    margin: 0 0 7px;
    color: var(--hie-muted);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hie-intro-text,
.hie-help,
.hie-explanation,
.hie-disclaimer {
    color: var(--hie-muted);
    line-height: 1.55;
}

.hie-intro-text {
    margin: 14px 0 0;
    font-size: clamp(0.96rem, 2.5vw, 1.05rem);
}

.hie-form {
    display: block;
}

.hie-field-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    width: 100%;
    min-width: 0;
}

.hie-field-group {
    margin: 0 0 16px;
    width: 100%;
    min-width: 0;
}

.hie-field-group label {
    display: block;
    margin: 0 0 8px;
    color: var(--hie-text);
    font-size: 0.95rem;
    font-weight: 750;
}

.hie-field-group input,
.hie-field-group select {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    min-height: 48px;
    padding: 12px 14px;
    color: var(--hie-text);
    background: var(--hie-panel);
    border: 1px solid var(--hie-border);
    border-radius: 14px;
    outline: none;
    font: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.hie-field-group input:focus,
.hie-field-group select:focus,
.hie-calculator button:focus-visible,
.hie-optional-section summary:focus-visible {
    border-color: var(--hie-focus);
    box-shadow: 0 0 0 3px rgba(79, 111, 159, 0.24);
    outline: none;
}

.hie-field-group input[aria-invalid="true"],
.hie-field-group select[aria-invalid="true"] {
    border-color: var(--hie-danger);
}

.hie-help {
    display: block;
    margin-top: 7px;
    font-size: 0.84rem;
}

.hie-optional-section {
    width: 100%;
    margin: 0 0 18px;
    padding: 14px;
    background: var(--hie-soft);
    border: 1px solid var(--hie-border);
    border-radius: 16px;
}

.hie-optional-section summary {
    cursor: pointer;
    color: var(--hie-text);
    font-weight: 750;
    border-radius: 10px;
}

.hie-optional-field {
    margin-top: 16px;
    margin-bottom: 0;
}

.hie-alert {
    width: 100%;
    margin: 0 0 16px;
    padding: 12px 14px;
    color: var(--hie-danger);
    background: var(--hie-danger-bg);
    border: 1px solid var(--hie-danger);
    border-radius: 14px;
    line-height: 1.45;
}

.hie-actions,
.hie-result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    width: 100%;
}

.hie-calculator button {
    width: 100%;
    max-width: 100%;
    min-height: 46px;
    padding: 12px 16px;
    border-radius: 999px;
    border: 1px solid var(--hie-border);
    cursor: pointer;
    font: inherit;
    font-weight: 750;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.hie-calculator button:hover {
    transform: translateY(-1px);
}

.hie-primary-button {
    color: var(--hie-panel);
    background: var(--hie-primary);
    border-color: var(--hie-primary);
}

.hie-primary-button:hover {
    background: var(--hie-primary-hover);
}

.hie-secondary-button,
.hie-theme-toggle {
    color: var(--hie-text);
    background: var(--hie-soft);
}

.hie-secondary-button:hover,
.hie-theme-toggle:hover {
    border-color: var(--hie-primary);
}

.hie-theme-toggle {
    width: auto;
    min-height: 40px;
    padding: 9px 14px;
    font-size: 0.88rem;
}

.hie-results {
    display: block;
}

.hie-main-result {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    margin: 18px 0;
    padding: clamp(18px, 5vw, 26px);
    color: var(--hie-text);
    background: var(--hie-soft);
    border: 1px solid var(--hie-border);
    border-radius: 18px;
    overflow-wrap: anywhere;
}

.hie-main-result span {
    color: var(--hie-muted);
    font-weight: 750;
}

.hie-main-result strong {
    font-size: clamp(2rem, 10vw, 3.4rem);
    line-height: 1;
    white-space: nowrap;
}

.hie-report {
    width: 100%;
    border-top: 1px solid var(--hie-border);
    border-bottom: 1px solid var(--hie-border);
}

.hie-report-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--hie-border);
}

.hie-report-row:last-child {
    border-bottom: 0;
}

.hie-report-row span {
    color: var(--hie-muted);
    font-weight: 700;
}

.hie-report-row strong {
    color: var(--hie-text);
    font-weight: 800;
    overflow-wrap: anywhere;
}

.hie-report-summary strong {
    line-height: 1.45;
}

.hie-explanation {
    margin: 18px 0;
}

.hie-result-actions {
    margin: 14px 0 0;
}

.hie-disclaimer {
    margin: 18px 0 0;
    padding-top: 16px;
    border-top: 1px solid var(--hie-border);
    font-size: 0.88rem;
}

@media (min-width: 640px) {
    .hie-heading-row {
        flex-direction: row;
        align-items: center;
    }

    .hie-field-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hie-actions .hie-primary-button,
    .hie-actions .hie-secondary-button,
    .hie-result-actions .hie-secondary-button {
        width: auto;
    }

    .hie-report-row {
        flex-direction: row;
        align-items: flex-start;
        justify-content: space-between;
        gap: 18px;
    }

    .hie-report-row span {
        flex: 0 0 38%;
    }

    .hie-report-row strong {
        flex: 1 1 auto;
        text-align: right;
    }
}

@media print {
    .hie-form,
    .hie-theme-toggle,
    .hie-result-actions,
    .hie-actions {
        display: none !important;
    }

    .hie-calculator {
        max-width: 100%;
        margin: 0;
        padding: 0;
        background: #ffffff;
        color: #000000;
    }

    .hie-panel {
        box-shadow: none;
        border-color: #dddddd;
    }
}