.calculator-page {
    background: #0a0e16;
    min-height: 100vh;
    padding: 30px 15px;
    color: #e0e0e0;
    font-family: 'Segoe UI', Arial, sans-serif;
}
.calc-title {
    text-align: center;
    font-size: 1.8rem;
    color: #fff;
    margin-bottom: 5px;
}
.calc-desc {
    text-align: center;
    color: #8892a4;
    margin-bottom: 25px;
    font-size: 0.95rem;
}
.calc-card {
    max-width: 480px;
    margin: 0 auto;
    background: #111827;
    border-radius: 12px;
    padding: 28px 24px;
    border: 1px solid #1e293b;
}
.mode-toggle {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
}
.mode-btn {
    flex: 1;
    padding: 8px 10px;
    background: #0f172a;
    border: 1px solid #1e293b;
    border-radius: 8px;
    color: #8892a4;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}
.mode-btn.active {
    background: #1e3a5f;
    border-color: #3b82f6;
    color: #60a5fa;
}
.mode-btn:hover {
    border-color: #3b82f6;
}
.formula-label {
    text-align: center;
    font-size: 1.05rem;
    color: #60a5fa;
    margin-bottom: 20px;
    padding: 10px;
    background: #0f172a;
    border-radius: 8px;
}
.input-group {
    margin-bottom: 14px;
}
.input-group label {
    display: block;
    font-size: 0.85rem;
    color: #8892a4;
    margin-bottom: 5px;
}
.input-group input {
    width: 100%;
    padding: 10px 12px;
    background: #0f172a;
    border: 1px solid #1e293b;
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    outline: none;
    box-sizing: border-box;
}
.input-group input:focus {
    border-color: #3b82f6;
}
.add-btn {
    width: 100%;
    padding: 10px;
    background: #0f172a;
    border: 1px dashed #3b82f6;
    border-radius: 8px;
    color: #60a5fa;
    font-size: 0.9rem;
    cursor: pointer;
    margin-bottom: 14px;
    transition: all 0.2s;
}
.add-btn:hover {
    background: #1e3a5f;
}
.remove-btn {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0 4px;
    vertical-align: middle;
}
.result-block {
    margin-top: 20px;
    background: #0f172a;
    border-radius: 8px;
    padding: 16px;
}
.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}
.result-row + .result-row {
    border-top: 1px solid #1e293b;
}
.result-label {
    color: #8892a4;
    font-size: 0.9rem;
}
.result-value {
    color: #34d399;
    font-size: 1.15rem;
    font-weight: 600;
}
.result-unit {
    color: #6b7280;
    font-size: 0.85rem;
    min-width: 30px;
    text-align: right;
}