/* CSS for Signed Number Practice Tool */
/* --- Global Theme & Base Styling --- */
:root {
    --पृष्ठभूमि-अन्धकार: #060b1a;
    --नील-वर्ण: #00d4ff;
    --काच-पृष्ठभूमि: rgba(255, 255, 255, 0.05);
    --काच-सीमा: rgba(255, 255, 255, 0.1);
    --मुख्य-पाठ्य: #f8fafc;
}

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

/* --- Navigation Header --- */
#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;
}

/* --- Base Layout & Components --- */
.मुख्यपात्रम् {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 50px);
    margin-top: 50px;
    width: 100%;
}

.उपकरणकीलः {
    background: transparent;
    border: 1px solid var(--काच-सीमा);
    color: var(--मुख्य-पाठ्य);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.उपकरणकीलः:hover {
    background: var(--नील-वर्ण);
    color: #060b1a;
    border-color: var(--नील-वर्ण);
}


.सारणी-पात्रम् {
    margin-top: 5px;
    padding: 0 20px 20px 20px;
    height: calc(100vh - 165px);
    overflow-y: auto;
    overflow-x: auto;
}

#अभ्याससारणी {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--काच-पृष्ठभूमि);
}

#अभ्याससारणी td {
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 0;
}

#अभ्याससारणी th {
    background-color: #1e1e1e;
    color: var(--मुख्य-पाठ्य);
    padding: 10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    font-weight: bold;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

#अभ्याससारणी td:first-child,
#अभ्याससारणी th:first-child {
    position: sticky;
    left: 0;
    z-index: 5;
    background-color: #1e1e1e;
}

#अभ्याससारणी th:first-child {
    z-index: 15;
}

.अभ्यासनिवेशनम् {
    width: 100%;
    box-sizing: border-box;
    background: transparent;
    border: none;
    color: var(--मुख्य-पाठ्य);
    padding: 10px;
    font-size: 1rem;
    outline: none;
}

.अभ्यासनिवेशनम्:focus {
    background-color: rgba(0, 212, 255, 0.1);
}

.उपकरणपट्टिका {
    padding: 0 20px 10px 20px;
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--काच-सीमा);
    display: flex;
    align-items: center;
}

.त्रुटि-निवेशनम् {
    background-color: rgba(255, 77, 77, 0.3) !important;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    #शीर्षपट्टिका {
        padding: 5px 10px;
    }
    
    #मार्गसञ्चारकडी {
        gap: 10px;
        font-size: 0.85em;
    }
    
    .उपकरणपट्टिका {
        flex-direction: column;
        gap: 10px;
        padding-top: 10px;
    }

    #परीक्षणकीलः, #faq-button {
        position: static !important;
        width: 100%;
        justify-content: center;
        padding: 8px;
    }

    #पृष्ठशीर्षकम् {
        font-size: 1.2em !important;
    }
    
    .सारणी-पात्रम् {
        padding: 0 5px 10px 5px;
    }
    
    #अभ्याससारणी th {
        font-size: 0.85rem;
        padding: 6px;
    }
    
    .अभ्यासनिवेशनम् {
        font-size: 0.9rem;
        padding: 6px;
    }
}

/* --- 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;
}