:root {
    --मुख्य-पृष्ठभूमि: #060b1a;
    --नील-वर्ण: #00d4ff;
    --काच-पृष्ठभूमि: rgba(255, 255, 255, 0.05);
    --काच-सीमा: rgba(255, 255, 255, 0.1);
    --मुख्य-पाठ्य: #f8fafc;
    --त्रुटि-वर्ण: #ff4444;
}

body.शरीरम् {
    margin: 0;
    padding: 0;
    background-color: var(--मुख्य-पृष्ठभूमि);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--मुख्य-पाठ्य);
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
}

#शीर्षपट्टिका {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 50px;
    z-index: 1000;
    background: rgba(6, 11, 26, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--काच-सीमा);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 20px;
    box-sizing: border-box;
}

#चिह्नपात्रम् a {
    display: flex;
    align-items: center;
}

#चिह्नम् {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: contain;
    transition: all 0.3s ease;
}

#चिह्नम्:hover {
    transform: scale(3);
    transform-origin: top left;
}

#मार्गसञ्चारकडी {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

#मार्गसञ्चारकडी a {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

#मार्गसञ्चारकडी a:hover {
    color: yellow;
    transform: translateY(-2px) scale(1.05);
    display: inline-block;
}

.मुख्यपात्रम् {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 50px);
    margin-top: 50px;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
}

#tool-container {
    height: calc(100vh - 150px);
    overflow-y: auto;
    overflow-x: hidden;
    width: 100%;
    padding-bottom: 20px;
    box-sizing: border-box;
}

.समस्या-पट्टिका {
    background: var(--काच-पृष्ठभूमि);
    border: 1px solid var(--काच-सीमा);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.विकल्प-सूची {
    background: rgba(0, 0, 0, 0.5);
    color: var(--मुख्य-पाठ्य);
    border: 1px solid var(--काच-सीमा);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 1rem;
    outline: none;
}

.समस्या-निवेशनम् {
    background: rgba(0, 0, 0, 0.3);
    color: var(--नील-वर्ण);
    border: 1px solid var(--काच-सीमा);
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 1.5rem;
    text-align: center;
    letter-spacing: 2px;
    outline: none;
    width: 300px;
}

.उपकरणकीलः {
    background: transparent;
    border: 1px solid var(--काच-सीमा);
    color: var(--मुख्य-पाठ्य);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.उपकरणकीलः:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--नील-वर्ण);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}

.उपकरणकीलः:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.सत्यता-सारणी {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.सत्यता-सारणी th, .सत्यता-सारणी td {
    border: 1px solid var(--काच-सीमा);
    padding: 8px;
    text-align: center;
}

.सत्यता-सारणी th {
    background: rgba(255, 255, 255, 0.1);
}

.xor-input {
    background: rgba(0, 0, 0, 0.3);
    color: var(--मुख्य-पाठ्य);
    border: 1px solid var(--काच-सीमा);
    width: 40px;
    text-align: center;
    padding: 4px;
    font-size: 1rem;
    outline: none;
}

.xor-input.त्रुटि {
    border-color: var(--त्रुटि-वर्ण);
    box-shadow: 0 0 5px rgba(255, 68, 68, 0.5);
}

.xor-input.सम्यक् {
    border-color: #00ff00;
    box-shadow: 0 0 5px rgba(0, 255, 0, 0.5);
    background: rgba(0, 255, 0, 0.1);
}

/* Step-by-step styles */
.पद-पङ्क्ति {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    letter-spacing: 5px;
    font-family: monospace;
}

.पद-निवेशनम् {
    width: 25px;
    height: 35px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--मुख्य-पाठ्य);
    border: 1px solid var(--काच-सीमा);
    text-align: center;
    font-size: 1.5rem;
    outline: none;
}

.पद-निवेशनम्.त्रुटि {
    border-color: var(--त्रुटि-वर्ण);
    color: var(--त्रुटि-वर्ण);
}

.पद-निवेशनम्.सम्यक् {
    border-color: #00ff00;
    color: #00ff00;
}

.हाइलाइट-स्रोतः {
    color: var(--मुख्य-पृष्ठभूमि) !important;
    background-color: #ffcc00 !important;
    text-shadow: none !important;
    border-radius: 4px;
    box-shadow: 0 0 5px #ffcc00;
}

.परिणाम-सन्देश {
    margin-top: 20px;
    font-size: 1.5rem;
    color: #00ff00;
    text-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
}

/* Responsive adjustments for mobile */
@media screen and (max-width: 768px) {
    #गणन-पटलम् {
        flex-direction: column !important;
        align-items: center !important;
    }
    
    #वाम-पटलम्, #दक्षिण-पटलम् {
        max-width: 100% !important;
        width: 100%;
        margin-bottom: 20px;
    }

    #पद-पात्रम् {
        overflow-x: auto;
        width: 100%;
        max-width: 90vw;
        box-sizing: border-box;
        padding: 10px !important;
    }

    .पद-पङ्क्ति {
        gap: 5px;
        letter-spacing: 2px;
        font-size: 1.2rem;
    }
    
    .पद-निवेशनम्, input.पद-निवेशनम् {
        width: 20px !important;
        height: 30px !important;
        font-size: 1.2rem !important;
    }
    
    /* Target the dummy zero */
    span[style*="width: 35px"] {
        width: 20px !important;
        height: 30px !important;
        line-height: 30px !important;
    }

    /* Final result block */
    .परिणाम-सन्देश {
        flex-wrap: wrap !important;
        justify-content: center !important;
    }
    
    #अन्तिम-स्रोतः, #अन्तिम-लक्ष्यम् {
        width: 120px !important;
        font-size: 1rem !important;
    }
    
    .परिणाम-सन्देश span {
        font-size: 1.2rem !important;
    }
}

/* --- Footer Section --- */
.site-footer {
    background: #030610;
    padding: 40px 5% 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.footer-content {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    margin-bottom: 30px;
    gap: 20px;
}

.footer-section {
    min-width: 200px;
    margin-bottom: 20px;
    text-align: left;
}

.footer-section h4 {
    color: #00d4ff;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.footer-section p, .footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    line-height: 1.6;
    display: block;
}

.footer-section a:hover {
    color: #fff;
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    color: #888;
    font-size: 0.9rem;
    text-align: center;
}