/* Area Calculator Styles */
.area-calculator-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
}

.calculator-card {
    background: var(--card-bg, #ffffff);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color, #e5e7eb);
}

.shape-selector {
    margin-bottom: 2rem;
}

.selector-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary, #6b7280);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.shape-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.75rem;
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.75rem;
    background: var(--input-bg, #f9fafb);
    border: 2px solid var(--border-color, #e5e7eb);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary, #111827);
}

.shape-btn:hover {
    background: var(--hover-bg, #f3f4f6);
    border-color: var(--primary-color, #3b82f6);
    transform: translateY(-2px);
}

.shape-btn.active {
    background: var(--primary-color, #3b82f6);
    border-color: var(--primary-color, #3b82f6);
    color: #ffffff;
}

.shape-btn svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.shape-btn span {
    text-align: center;
}

.input-section {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    align-items: start;
}

.shape-visualization {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg, #f9fafb);
    border-radius: 12px;
    padding: 1rem;
    min-height: 200px;
}

.shape-preview {
    width: 100%;
    height: 100%;
}

.shape-preview svg {
    width: 100%;
    height: 100%;
}

.inputs-container {
    flex: 1;
}

.input-group {
    display: grid;
    gap: 1.5rem;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-field label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary, #111827);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: 0.875rem 1rem;
    padding-right: 4rem;
    font-size: 1rem;
    border: 2px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    background: var(--input-bg, #ffffff);
    color: var(--text-primary, #111827);
    transition: all 0.2s ease;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color, #3b82f6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-wrapper .unit {
    position: absolute;
    right: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted, #9ca3af);
    pointer-events: none;
}

.result-section {
    margin-bottom: 2rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    background: linear-gradient(135deg, var(--primary-color, #3b82f6) 0%, var(--primary-dark, #2563eb) 100%);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    color: #ffffff;
    margin-bottom: 1.5rem;
}

.result-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.result-unit {
    font-size: 1rem;
    opacity: 0.9;
}

.calculation-steps {
    background: var(--input-bg, #f9fafb);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color, #3b82f6);
}

.calculation-steps h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary, #111827);
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
    color: var(--text-secondary, #4b5563);
}

.step-item:last-child {
    margin-bottom: 0;
}

.step-number {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color, #3b82f6);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

.btn-calculate,
.btn-reset {
    flex: 1;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-calculate {
    background: var(--primary-color, #3b82f6);
    color: #ffffff;
}

.btn-calculate:hover {
    background: var(--primary-dark, #2563eb);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-calculate:active {
    transform: translateY(0);
}

.btn-reset {
    background: var(--input-bg, #f9fafb);
    color: var(--text-primary, #111827);
    border: 2px solid var(--border-color, #e5e7eb);
}

.btn-reset:hover {
    background: var(--hover-bg, #f3f4f6);
    border-color: var(--text-muted, #9ca3af);
}

.info-card {
    background: var(--card-bg, #ffffff);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color, #e5e7eb);
}

.info-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary, #111827);
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary, #111827);
}

.info-card p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary, #4b5563);
    margin-bottom: 1.5rem;
}

.formula-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.formula-item {
    padding: 1rem;
    background: var(--input-bg, #f9fafb);
    border-radius: 8px;
    font-size: 0.9375rem;
    color: var(--text-primary, #111827);
    
}

.formula-item strong {
    color: var(--primary-color, #3b82f6);
    margin-right: 0.5rem;
}

.applications-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.applications-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9375rem;
    color: var(--text-secondary, #4b5563);
    line-height: 1.6;
}

.applications-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color, #3b82f6);
    font-weight: 600;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .calculator-card,
    .info-card {
        padding: 1.5rem;
    }

    .shape-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .shape-btn {
        padding: 0.875rem 0.5rem;
        font-size: 0.8125rem;
    }

    .shape-btn svg {
        width: 28px;
        height: 28px;
    }

    .input-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .shape-visualization {
        min-height: 150px;
    }

    .input-group {
        grid-template-columns: 1fr;
    }

    .result-value {
        font-size: 2rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-calculate,
    .btn-reset {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .shape-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-value {
        font-size: 1.75rem;
    }

    .info-card h2 {
        font-size: 1.25rem;
    }

    .info-card h3 {
        font-size: 1.125rem;
    }
}

/* Input states */
.input-wrapper input:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
}

.input-wrapper input:valid:not(:placeholder-shown) {
    border-color: #10b981;
}