/* Calculator Navigation */
.calculator-nav {
    background: var(--header-bg);
    padding: 1rem 0;
    border-bottom: 2px solid var(--primary);
}

.calculator-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.calc-nav-btn {
    background: none;
    color: #fff;
    border: 1px solid var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
}

.calc-nav-btn:hover {
    background: var(--primary);
    color: #fff;
}

.calc-nav-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Calculator Main */
.calculator-main {
    padding: 2rem 1rem 6rem 1rem;
    min-height: 70vh;
    background: var(--bg);
}

.calculator-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 14px;
    box-shadow: 0 2px 12px var(--border);
    padding: 2rem;
}

.calculator-container h1 {
    font-size: 2.2rem;
    color: var(--text);
    margin-bottom: 0.5rem;
    text-align: center;
}

.calculator-description {
    color: var(--muted-text);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* Calculator Form */
.calculator-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.form-group input,
.form-group select {
    padding: 0.8rem;
    border: 2px solid var(--input-border);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.form-help {
    color: var(--muted-text);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.calculate-btn {
    background: linear-gradient(90deg, var(--header-bg) 0%, var(--primary) 100%);
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    grid-column: 1 / -1;
    margin-top: 1rem;
}

.calculate-btn:hover {
    background: linear-gradient(90deg, var(--primary) 0%, var(--header-bg) 100%);
    transform: translateY(-2px);
}

/* Results */
.results-container {
    background: var(--input-bg);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 4px solid var(--primary);
    margin-bottom: 2rem;
}

.results-container h2 {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.results-section {
    margin-bottom: 1.5rem;
}

.results-section h3 {
    color: var(--text);
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--input-border);
    padding-bottom: 0.5rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--input-border);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: 600;
    color: var(--text);
}

.result-value {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}

/* Tips Container */
.tips-container {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--input-border);
}

.tips-container h3 {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.tip-card {
    background: var(--input-bg);
    border-radius: 6px;
    padding: 1rem;
    border: 1px solid var(--input-border);
}

.tip-card h4 {
    color: var(--text);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.tip-card p {
    color: var(--muted-text);
    font-size: 0.9rem;
    line-height: 1.4;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-nav-container {
        justify-content: flex-start;
        overflow-x: auto;
        padding: 0 0.5rem;
    }
    
    .calc-nav-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .calculator-container {
        padding: 1.5rem;
        margin: 0 0.5rem;
    }
    
    .calculator-form {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
}