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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #22c55e;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.site-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.site-desc {
    font-size: 1.1rem;
    opacity: 0.9;
}

.category-nav {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.category-nav .container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.category-btn {
    padding: 8px 20px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.main-content {
    flex: 1;
    padding: 30px 0;
}

.software-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}

.software-card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.software-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.software-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.software-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.software-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.software-body {
    padding: 20px;
}

.version-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
}

.version-item:last-child {
    margin-bottom: 0;
}

.version-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #f1f5f9;
    cursor: pointer;
}

.version-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.version-number {
    font-weight: 600;
    color: var(--primary-color);
}

.version-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.toggle-icon {
    transition: transform 0.2s ease;
    color: var(--text-secondary);
}

.version-item.expanded .toggle-icon {
    transform: rotate(180deg);
}

.version-details {
    display: none;
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.version-item.expanded .version-details {
    display: block;
}

.changelog {
    background: #f8fafc;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 16px;
    white-space: pre-wrap;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.changelog-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.download-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: background 0.2s ease;
}

.download-btn:hover {
    background: var(--primary-hover);
}

.download-btn.disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.6;
    pointer-events: none;
}

.download-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 36px;
    padding: 4px;
    background: #e2e8f0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: white;
}

.copy-btn.copied {
    background: var(--success-color);
    color: white;
}

.show-more-btn {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    margin-top: 12px;
    transition: all 0.2s ease;
}

.show-more-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

.error-message {
    text-align: center;
    padding: 40px;
    color: #ef4444;
    grid-column: 1 / -1;
}

@media (max-width: 768px) {
    .header {
        padding: 30px 0;
    }

    .site-title {
        font-size: 1.8rem;
    }

    .site-desc {
        font-size: 1rem;
    }

    .software-list {
        grid-template-columns: 1fr;
    }

    .category-nav .container {
        justify-content: center;
    }

    .version-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .version-info {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .software-header,
    .software-body {
        padding: 15px;
    }

    .download-links {
        flex-direction: column;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
    }
}