:root {
    --columns-desktop: 5;
    --columns-laptop: 4;
    --columns-tablet: 3;
    --columns-mobile: 2;

    /* Color schemes for each section */
    --vowels-bg: #f0f7ff;
    --vowels-box: #4a90e2;
    --vowels-text: #1a3a6e;

    --consonants-bg: #fff5f0;
    --consonants-box: #e67e4a;
    --consonants-text: #6e2a1a;

    --diphthongs-bg: #f5fff0;
    --diphthongs-box: #5cb85c;
    --diphthongs-text: #2a6e1a;

    --triphthongs-bg: #f0f5ff;
    --triphthongs-box: #5c85b8;
    --triphthongs-text: #1a3a6e;

    --special-bg: #f8f0ff;
    --special-box: #9b4de2;
    --special-text: #4a1a6e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
    background-color: #f9f9f9;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-container {
    margin: 20px 0;
}

.logo {
    max-width: 100%;
    height: auto;
}

h1 {
    color: #333;
    margin-bottom: 10px;
}

/* Section Styles */
.symbol-section {
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.symbol-section h2 {
    margin-bottom: 5px;
    padding-bottom: 5px;
    text-align: center;
    font-size: 1.5rem;
}

.symbols-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    gap: 15px;
}

.symbol-box {
    border-radius: 50%;
    padding: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
    aspect-ratio: 1/1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    flex: 0 0 calc((100% / var(--columns-desktop)) - 20px);
    overflow: hidden;
}

.symbol-box:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    filter: brightness(1.1);
}

.symbol-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.2));
}

/* Section-specific colors */
.symbol-section:nth-child(1) {
    background-color: var(--vowels-bg);
}
.symbol-section:nth-child(1) h2 {
    color: var(--vowels-text);
    border-bottom: 2px solid var(--vowels-box);
}
.symbol-section:nth-child(1) .symbol-box {
    background: var(--vowels-box);
}

.symbol-section:nth-child(2) {
    background-color: var(--consonants-bg);
}
.symbol-section:nth-child(2) h2 {
    color: var(--consonants-text);
    border-bottom: 2px solid var(--consonants-box);
}
.symbol-section:nth-child(2) .symbol-box {
    background: var(--consonants-box);
}

symbol-section:nth-child(3) {
    background-color: var(--diphthongs-bg);
}
.symbol-section:nth-child(3) h2 {
    color: var(--diphthongs-text);
    border-bottom: 2px solid var(--diphthongs-box);
}
.symbol-section:nth-child(3) .symbol-box {
    background: var(--diphthongs-box);
}

.symbol-section:nth-child(4) {
    background-color: var(--triphthongs-bg);
}
.symbol-section:nth-child(4) h2 {
    color: var(--triphthongs-text);
    border-bottom: 2px solid var(--triphthongs-box);
}
.symbol-section:nth-child(4) .symbol-box {
    background: var(--triphthongs-box);
}

.symbol-section:nth-child(5) {
    background-color: var(--special-bg);
}
.symbol-section:nth-child(5) h2 {
    color: var(--special-text);
    border-bottom: 2px solid var(--special-box);
}
.symbol-section:nth-child(5) .symbol-box {
    background: var(--special-box);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .symbol-box {
        flex: 0 0 calc((100% / var(--columns-laptop)) - 20px);
    }
}

@media (max-width: 768px) {
    .symbol-box {
        flex: 0 0 calc((100% / var(--columns-tablet)) - 20px);
    }
}

@media (max-width: 480px) {
    .symbol-box {
        flex: 0 0 calc((100% / var(--columns-mobile)) - 20px);
    }
    .symbol-section {
        padding: 15px !important;
    }
}