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

html, body {
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #1a1a1a;
    color: #e0e0e0;
}

.page-wrapper {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    color: #e0e0e0;
    margin-bottom: 10px;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    font-weight: 300;
    letter-spacing: 3px;
}

.subtitle {
    font-size: 1.3rem;
    opacity: 0.9;
    font-weight: 300;
}

.category-nav {
    margin: 0 0 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    padding: 12px;
    background: #2a2a2a;
    border-radius: 15px;
    border: 1px solid #3a3a3a;
}

.category-btn {
    padding: 14px 28px;
    background: #333;
    border: 1px solid #4a4a4a;
    border-radius: 8px;
    color: #e0e0e0;
    font-size: 0.95rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s ease;
    font-weight: 500;
    flex: 0 0 calc(20% - 12px);
    text-align: center;
}

.category-btn:hover {
    background: #3a3a3a;
    border-color: #5a5a5a;
}

.category-btn.active {
    background: #5a5a5a;
    color: #fff;
    border-color: #7a7a7a;
    font-weight: 600;
    box-shadow: 0 0 0 2px rgba(255,255,255,0.3);
    transform: scale(1.05);
}

main {
    margin: 0;
}

.app-container {
    background: #2a2a2a;
    border-radius: 15px;
    border: 1px solid #3a3a3a;
    padding: 12px;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
}

.app-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #e0e0e0;
    transition: all 0.3s ease;
    padding: 4px;
    border-radius: 10px;
}

.app-card:active {
    transform: scale(0.95);
}

.app-card:hover {
    background: #333;
}

.app-icon {
    width: 70px;
    height: 70px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    color: #e0e0e0;
    font-weight: 500;
    margin-bottom: 3px;
    background: #333;
    border: 1px solid #4a4a4a;
    transition: all 0.3s ease;
    overflow: hidden;
}

.app-card:hover .app-icon {
    background: #3a3a3a;
    border-color: #5a5a5a;
    transform: translateY(-3px);
}

.app-icon-image {
    padding: 0;
    border: none;
    background: #fff;
}

.app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
}

.app-card span {
    font-size: 1rem;
    text-align: center;
    font-weight: 500;
    color: #e0e0e0;
    width: 100%;
    display: block;
}

footer {
    text-align: center;
    color: #888;
    margin-top: 20px;
    padding: 15px 0;
    font-size: 1.05rem;
}

.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #3a3a3a;
    border-top-color: #e0e0e0;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 480px) {
    .page-wrapper {
        padding: 10px;
    }

    header {
        margin-bottom: 8px;
    }

    header h1 {
        font-size: 1.8rem;
        letter-spacing: 1px;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .category-nav {
        padding: 10px;
        gap: 6px;
        margin-bottom: 8px;
    }

    .category-btn {
        padding: 10px 16px;
        font-size: 0.85rem;
        flex: 0 0 calc(20% - 5px);
    }

    .app-container {
        padding: 10px;
    }

    .app-grid {
        gap: 4px;
    }

    .app-card {
        padding: 3px;
    }

    .app-icon {
        width: 56px;
        height: 56px;
        font-size: 1.9rem;
        margin-bottom: 2px;
    }

    .app-card span {
        font-size: 0.85rem;
    }

    footer {
        font-size: 0.9rem;
        margin-top: 15px;
        padding: 12px 0;
    }
}

@media (max-width: 360px) {
    .page-wrapper {
        padding: 8px;
    }

    header {
        margin-bottom: 6px;
    }

    header h1 {
        font-size: 1.5rem;
        letter-spacing: 0.5px;
    }

    .subtitle {
        font-size: 1rem;
    }

    .category-nav {
        padding: 8px;
        gap: 5px;
        margin-bottom: 6px;
    }

    .category-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
        flex: 0 0 calc(20% - 4px);
    }

    .app-container {
        padding: 8px;
    }

    .app-grid {
        gap: 3px;
    }

    .app-card {
        padding: 2px;
    }

    .app-icon {
        width: 48px;
        height: 48px;
        font-size: 1.6rem;
        margin-bottom: 1px;
    }

    .app-card span {
        font-size: 0.8rem;
    }

    footer {
        margin-top: 12px;
        padding: 10px 0;
    }
}

@media (max-width: 320px) {
    .page-wrapper {
        padding: 0;
    }

    .app-container {
        padding: 5px;
        border-radius: 10px;
    }

    .app-grid {
        gap: 2px;
    }

    .app-card {
        padding: 1px;
    }

    .app-icon {
        margin-bottom: 1px;
    }

    .category-nav {
        padding: 6px;
        gap: 4px;
        border-radius: 10px;
    }

    .category-btn {
        padding: 6px 8px;
        font-size: 0.75rem;
        flex: 0 0 calc(20% - 3px);
    }
}