:root {
    --aq-color-primary: #0073e6;
    --aq-color-primary-light: #e6f1fc;
    --aq-color-secondary-light: #e0f5fe;
    --aq-color-tertiary-light: #e6f7f0;
    --aq-color-text-dark: #333333;
    --aq-color-text-light: #555555;
    --aq-color-border: #dcdcdc;
    --aq-color-bg-light: #f9f9f9;
    --aq-color-bg-white: #ffffff;
    --aq-color-water: #3b82f6;
    --aq-color-substrate: #a16207;
    --aq-color-tank: #9ca3af;
    --aq-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --aq-border-radius: 8px;
    --aq-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.aquarium-calculator-app {
    font-family: var(--aq-font-family);
    color: var(--aq-color-text-dark);
    background-color: transparent;
    margin: 0 auto;
    width: 100%;
    max-width: 1290px;
}

.aq-main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 992px) {
    .aq-main-grid {
        grid-template-columns: 2fr 3fr;
        align-items: start;
    }
}

.aq-card {
    background-color: var(--aq-color-bg-white);
    border-radius: var(--aq-border-radius);
    padding: 24px;
    box-shadow: var(--aq-shadow);
    border: 1px solid var(--aq-color-border);
}

.aq-form-section {
    margin-bottom: 24px;
}
.aq-form-section:last-child {
    margin-bottom: 0;
}

.aq-section-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 12px 0;
    color: var(--aq-color-text-dark);
}

.aq-shape-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.aq-shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: var(--aq-border-radius);
    border: 2px solid transparent;
    background-color: var(--aq-color-bg-light);
    color: var(--aq-color-text-light);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}
.aq-shape-btn:hover {
    border-color: #a5cafa;
}
.aq-shape-btn.active {
    background-color: var(--aq-color-primary-light);
    border-color: var(--aq-color-primary);
    color: var(--aq-color-primary);
    font-weight: 600;
}
.aq-shape-btn svg {
    width: 40px;
    height: 40px;
    margin-bottom: 4px;
}
.aq-shape-btn span {
    font-size: 0.75rem;
}

.aq-unit-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}
.aq-unit-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--aq-color-text-light);
}
.aq-unit-btn {
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.875rem;
    border: 1px solid var(--aq-color-border);
    background-color: var(--aq-color-bg-white);
    color: var(--aq-color-text-light);
    cursor: pointer;
    transition: all 0.2s ease;
}
.aq-unit-btn.active {
    background-color: var(--aq-color-primary);
    color: var(--aq-color-bg-white);
    border-color: var(--aq-color-primary);
}

.aq-grid-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.aq-input-group {
    display: flex;
    flex-direction: column;
}
.aq-col-span-2 {
    grid-column: span 2 / span 2;
}

.aq-label {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--aq-color-text-light);
}
.aq-input-wrapper {
    position: relative;
}
.aq-input {
    width: 100%;
    padding: 10px 45px 10px 12px;
    border: 1px solid var(--aq-color-border);
    border-radius: var(--aq-border-radius);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}
.aq-input:focus {
    outline: none;
    border-color: var(--aq-color-primary);
    box-shadow: 0 0 0 2px var(--aq-color-primary-light);
}
.aq-input-unit {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--aq-color-text-light);
    font-size: 0.875rem;
}

.aq-material-selector {
    display: flex;
    gap: 8px;
}
.aq-material-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--aq-color-border);
    border-radius: var(--aq-border-radius);
    background-color: var(--aq-color-bg-white);
    color: var(--aq-color-text-light);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}
.aq-material-btn.active {
    background-color: var(--aq-color-primary);
    color: var(--aq-color-bg-white);
    border-color: var(--aq-color-primary);
    font-weight: 600;
}

.aq-reset-btn {
    width: 100%;
    padding: 12px;
    background-color: #6c757d;
    color: var(--aq-color-bg-white);
    border: none;
    border-radius: var(--aq-border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}
.aq-reset-btn:hover {
    background-color: #5a6268;
}

/* Results Section */
#results-placeholder {
    text-align: center;
    padding: 40px 0;
}
.aq-placeholder-icon {
    width: 64px;
    height: 64px;
    color: #cbd5e1;
    margin: 0 auto 16px;
}
.aq-placeholder-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 4px 0;
}
.aq-placeholder-text {
    color: var(--aq-color-text-light);
    margin: 0;
}

#results-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.hidden {
    display: none;
}
.aq-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.aq-results-main-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}
.aq-print-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--aq-color-bg-light);
    border: 1px solid var(--aq-color-border);
    color: var(--aq-color-text-dark);
    border-radius: var(--aq-border-radius);
    cursor: pointer;
    transition: background-color 0.2s ease;
}
.aq-print-btn:hover {
    background-color: #e2e8f0;
}
.aq-print-icon {
    width: 20px;
    height: 20px;
}

.aq-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.aq-result-card {
    background-color: var(--card-bg, var(--aq-color-bg-light));
    padding: 16px;
    border-radius: var(--aq-border-radius);
}
.aq-result-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--aq-color-text-light);
    margin: 0 0 4px 0;
}
.aq-result-value {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}
.aq-result-subvalue {
    font-size: 0.875rem;
    color: var(--aq-color-text-light);
    margin: 0;
}

.aq-weight-breakdown {
    padding-top: 8px;
}
.aq-breakdown-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 8px 0;
}
.aq-weight-bar {
    display: flex;
    width: 100%;
    height: 32px;
    border-radius: 9999px;
    overflow: hidden;
    background-color: var(--aq-color-bg-light);
}
.aq-weight-bar div {
    transition: width 0.5s ease-in-out;
}
.aq-weight-legend {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--aq-color-text-light);
    padding: 0 4px;
}
.aq-legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}
.aq-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.aq-comparison-card {
    text-align: center;
    background-color: var(--aq-color-bg-light);
    padding: 16px;
    border-radius: var(--aq-border-radius);
    font-size: 0.875rem;
}
.aq-comparison-card p {
    margin: 0;
    color: var(--aq-color-text-light);
}
.aq-comparison-card strong {
    color: var(--aq-color-text-dark);
}
.aq-comparison-subtitle {
    font-size: 0.75rem;
    margin-top: 4px !important;
}

@media print {
    body * {
        visibility: hidden;
    }
    .aq-results-col, .aq-results-col * {
        visibility: visible;
    }
    .aquarium-calculator-app {
        box-shadow: none;
        border: none;
    }
    .aq-results-col {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
    }
    .aq-print-btn {
        display: none;
    }
}