:root {
    --main-bg-color: white;
    --total-bg-color: #f4f4f4;
    --border-color: #ccc;
    --note-text-color: #666;
    --warning-text-color: red;
    --total-digits-color: RoyalBlue;
    --menu-text-color: DarkGreen;
    --footer-text-color: DarkGreen;
    --power-grid-columns: 4;
    --battery-grid-columns: 2;
    --normal-grid-gap: 0.5rem;
  }

body {
    background-color: var(--main-bg-color);
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 1rem;
}

.container, .menu, .footer, .menubar {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.menubar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.menu {
    display: grid;
    grid-template-columns: 1fr 3fr;
    color: var(--menu-text-color, darkgreen);
    align-items: center;
}

.menu-left {
    display: flex;
    gap: 2rem;
}

.menu-item {
    text-decoration: none;
    color: var(--menu-text-color, darkgreen);
    font-weight: bold;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.menu-item:hover {
    background-color: var(--total-bg-color);
}

.menu-item.active {
    background-color: var(--total-bg-color);
    border-bottom: 3px solid var(--menu-text-color);
}

.menu-right {
    display: flex;
    align-items: center;
}

.switch {
    text-align: right;
    cursor: pointer;
    user-select: none;
}

.menu-right .switch {
    margin: 0;
}

.footer {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    color: var(--footer-text-color, darkgreen);
    align-items: center;
}

.logo, .heading {
    font-size: x-large;
    font-weight: bold;
    text-align: left;
    margin-bottom: 0.5rem;
    margin-left: 1rem;
    margin-top: 0;
}

.logo img {
    width: 10rem;
}

.logo-small, .heading-small, .buy-me-a-coffee {
    font-size: small;
    text-align: center;
    margin-top: 1rem;
}

.logo-small img {
    width: 6rem;
}

.header, .row, .power-container {
    display: grid;
    grid-template-columns: repeat(var(--power-grid-columns), 1fr);
    gap: var(--normal-grid-gap, 0.5rem);
}

.header div, .row div, .power-container div, .energy-container div {
    border: 1px solid var(--border-color);
    padding: 0.25rem;
    text-align: center;
}

.header div, .energy-container div {
    background-color: var(--total-bg-color);
    font-weight: bold;
}

.power-info, .recommendations-meaning {
    text-align: left;
    text-indent: 1rem;
    font-size: small;
    color: #333;
    margin: 0 1rem 0.5rem 1rem;
}
.power-info {
    grid-column: 1 / span var(--power-grid-columns);
}

.recommendations-meaning {
    grid-column: 1 / span var(--battery-grid-columns);
}

.power-info p, .recommendations-meaning p {
    margin: 0;
}

.info-bold {
    font-weight: bold;
}

input[type="text"] {
    width: 80px;
    text-align: center;
}

.total-row {
    background-color: var(--total-bg-color);
    font-weight: bold;
}

#devices-in-use, #max-voltage, #total-power, #required-energy {
    font-weight: bold;
    color: var(--total-digits-color, RoyalBlue);
}

.section-card {
    max-width: 1100px;
    margin: 0.75rem auto;
    background-color: var(--main-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem 1rem;
}

.energy-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.energy-value {
    font-weight: bold;
    color: var(--total-digits-color);
}

.battery-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.battery-container.faded {
    opacity: 0.6;
    pointer-events: none;
    transition: opacity 0.25s;
}

sup {
    color: var(--total-digits-color, RoyalBlue);
    font-size: x-small;
}

.battery-header {
    font-weight: bold;
    padding: 0.25rem;
}

.battery-note {
    font-size: small;
    color: var(--note-text-color, #666);
    font-weight: normal;
    display: block;
    margin-top: 0.25rem;
}

.battery-grid {
    display: grid;
    grid-template-columns: auto auto auto auto;
    gap: 0rem;
}

.battery-grid-inverter {
    grid-template-columns: auto auto auto;
}

.battery-grid > div {
    padding: 0.25rem;
    /* padding: 0; */
    margin: 0;
    border: 1px solid #ddd;
    text-align: center;
}

.grid-header {
    font-weight: bold;
    background-color: #f0f0f0;
    font-size: small;
}

.span-3 {
    grid-column: span 3;
    color: var(--warning-text-color, red);
    font-size: small;
}

.battery-warning {
    /* display: block; */
    padding: 0.25rem;
    color: var(--warning-text-color, red);
    font-size: small;
}

.battery-capacity {
    color: var(--total-digits-color, RoyalBlue);
    font-weight: bold;
}

.lang-option {
    opacity: 0.5;
    transition: opacity 0.3s;
}

.lang-option.active {
    opacity: 1;
    font-weight: bold;
}

.lang-option:hover {
    opacity: 0.8;
}

#language-switch {
    user-select: none;
}

#devices-list {
    margin-bottom: 0.5rem;
}

.device-card {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 0.375rem;
    transition: background-color 0.25s, opacity 0.25s;
}

.device-card.unchecked {
    background-color: #ebebeb;
    opacity: 0.6;
}

.device-card.checked {
    background-color: var(--main-bg-color);
    opacity: 1;
}

.card-label {
    min-width: 5.5rem;
    font-weight: bold;
}

.card-field {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.usage-unit {
    font-size: small;
    color: var(--note-text-color, #666);
}

.simultaneous-checkbox {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
    accent-color: var(--menu-text-color, darkgreen);
}

.card-power-field {
    flex: 1;
    text-align: right;
    font-weight: bold;
    color: var(--total-digits-color);
}

.card-remove {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 1.5rem;
    height: 1.5rem;
    cursor: pointer;
    color: var(--note-text-color);
    font-size: 1rem;
    line-height: 1;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.card-remove:hover {
    background-color: var(--warning-text-color);
    color: white;
    border-color: var(--warning-text-color);
}

.add-device-btn {
    display: inline-block;
    margin: 0.5rem 0;
    padding: 0.4rem 1rem;
    background-color: var(--menu-text-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.add-device-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.add-device-btn:hover:not(:disabled) {
    opacity: 0.85;
}