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

html {
    color-scheme: dark;
    font-size: 14px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #4a4a4a;
    color: rgba(255, 255, 255, .87);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 10px;
}

.header {
    text-align: center;
    padding: 20px 0;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    color: rgba(255, 255, 255, .6);
    font-size: 1rem;
}

.main-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.accordion-section {
    flex: 1;
    background-color: #242424;
    border-radius: 16px;
    padding: 15px;
}

.sub-accordion {
    padding-left: 20px;
}

.sub-item {
    background-color: #0a0a0a;
}

.sub-header {
    font-size: 16px;
    padding: 14px 20px;
}

.sub-header:hover {
    background-color: #111;
}

.accordion-item.active .sub-header {
    background-color: #0f0f0f;
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.accordion-item {
    border: 1px solid #242424;
    border-radius: 8px;
    overflow: hidden;
    background-color: #000000;
}

.accordion-header {
    width: 100%;
    background-color: #000000;
    color: white;
    padding: 18px 24px;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.accordion-header:hover {
    background-color: #1a1a1a;
}

.accordion-item.active .accordion-header {
    background-color: #0a0a0a;
}

.accordion-icon {
    font-size: 24px;
    font-weight: bold;
    transition: transform 0.3s;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    background-color: #000000;
    transition: max-height 0.3s ease-out;
}

.accordion-item.active > .accordion-content {
    max-height: 2000px;
    transition: max-height 0.4s ease-in;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    padding: 20px;
}

.pack-card {
    background-color: #242424;
    border: 2px solid #242424;
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.pack-card:hover {
    background-color: #2b2b2b;
    border-color: #2b2b2b;
    transform: translateY(-2px);
}

.pack-card.selected {
    background-color: #444;
    border-color: #630000;
    box-shadow: 0 0 0 2px #630000;
}

.pack-card.selected:hover {
    background-color: #505050;
}

.pack-image {
    aspect-ratio: 1;
    background-color: #1a1a1a;
    border-radius: 6px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    color: #666;
    font-size: 12px;
}

.pack-name {
    font-size: 13px;
    color: rgba(255, 255, 255, .87);
    word-wrap: break-word;
}

.sidebar {
    width: 320px;
    position: sticky;
    top: 20px;
}

.selector-card {
    background-color: #000000;
    border-radius: 16px;
    overflow: hidden;
}

.selector-title {
    background-color: #630000;
    color: white;
    padding: 20px;
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.selector-content {
    padding: 20px;
    color: rgba(255, 255, 255, .87);
}

.selector-content p {
    margin: 0;
    font-size: 14px;
}

.selector-actions {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.pack-input {
    width: 100%;
    padding: 12px;
    background-color: #242424;
    border: 1px solid #242424;
    border-radius: 6px;
    color: white;
    font-size: 14px;
}

.pack-input::placeholder {
    color: rgba(255, 255, 255, .4);
}

.pack-input:focus {
    outline: none;
    border-color: #630000;
}

.download-button {
    width: 100%;
    padding: 12px;
    background-color: #630000;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.download-button:hover:not(:disabled) {
    background-color: #540000;
}

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

@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
        padding: 15px;
    }
}